JP2013253713A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator having an intermediate temperature chamber, capable of maintaining intermediate temperature irrespective of influence of outside air.SOLUTION: A refrigerator includes a plurality of storage chambers including an intermediate temperature chamber formed in a casing having heat insulation performance and allowing the temperature in the storage chamber to be maintained at intermediate temperatures in the order of 10°C to 20°C, a refrigeration cycle having a compressor, a condenser, a cooler, and a throttle device, and a machine chamber disposed adjacent to the intermediate temperature chamber and accommodating the compressor, and a heat transfer coefficient of a heat transfer boundary wall partitioning between the machine chamber and the intermediate temperature chamber is higher than a heat transfer coefficient of other boundary wall partitioning the intermediate temperature chamber.

Description

  The present invention relates to a refrigerator, and more particularly to a refrigerator having a storage room or a storage area that maintains an intermediate temperature (about 10 to 20 ° C.) higher than a refrigeration temperature zone.

  In a conventional refrigerator, since the optimum temperature range varies depending on the type of food to be stored and the storage period, it is generally performed to store in different storage rooms according to the food. For example, raw meat and fish are stored in a chilled room (about 0 ° C) for immediate use, and stored in a freezer room (about -18 ° C) for long-term storage, while vegetables and fruits are stored in a vegetable room (about 6 ° C). ), The majority of foods after cooking, etc. are stored in a refrigerator (about 3 ° C).

  On the other hand, foods that are desirable to be stored in the middle temperature range, such as rice and oil, may have a large capacity, and are generally called “cold and dark places”, so-called “cool and dark places”. It has been stored in the surrounding storage. In addition, vegetables and fruits, such as eggplants, cucumbers, and bananas, which are prone to low temperature damage, are often stored in a cool and dark place.

  However, in recent years, housing has become highly insulated and airtight, and due to integration with the living room, etc., the location of the kitchen in the housing has become a place where the room temperature may not meet the middle temperature range, such as the south and north sides. Increasingly, it has become difficult to ensure a cool and dark place for foods that are desirable to store in medium temperature zones.

  Therefore, as a conventional refrigerator equipped with a cool and dark place, the one that maintains the third storage chamber at a medium temperature of 10 to 15 ° C. by setting the evaporation temperature of the cooler that cools the air supplied to each storage chamber high. It has been proposed (see, for example, Patent Document 1).

  In addition, for example, a third temperature chamber including a temperature zone in a cool and dark place that is 0 ° C. or more and 20 ° C. or less is arranged at the top of the refrigerator, and the third temperature chamber is a cooling system independent of other temperature chambers What is cooled has been proposed (see, for example, Patent Document 2).

JP-A-10-054641 (paragraphs [0014]-[0016], FIG. 1) JP 2001-133110 A (paragraphs [0044]-[0060], FIG. 2)

  However, in conventional refrigerators with a high evaporation temperature, the inside of the storage container can be maintained at a medium temperature in the third storage room, so that foods such as subtropical crops and rice whose storage temperature is too low at the refrigeration temperature can be stored well. However, since the evaporating temperature of the cooler is set to be high in order to maintain the third storage chamber at an intermediate temperature, the storage temperature of the first and second storage chambers is also increased and the frozen storage is performed. In addition, when the outside air (installation location) temperature is as low as 10 ° C. or lower, the evaporation temperature also decreases, and there is no means for raising the temperature in the storage chamber, so that the third storage chamber can be maintained at an intermediate temperature. There was a problem that it was not possible.

  In addition, in a refrigerator that is cooled by a cooling system that is independent of other conventional temperature chambers, the third temperature chamber is maintained at 0 ° C. or more and 20 ° C. or less by an independent cooling system. , Foods that have been stored in “cold and dark places” can be stored for a long time under proper temperature control, but the cost is increased because two cooling systems are required. When the outside air temperature is low, there is a problem that the third temperature chamber cannot be maintained at an intermediate temperature.

  This invention is made | formed in order to solve the above subjects, and it aims at providing the refrigerator which has a middle greenhouse which maintains medium temperature about 10 degreeC-20 degreeC irrespective of external temperature.

  The refrigerator according to the present invention is formed in a casing having heat insulation performance, a plurality of storage rooms including a middle greenhouse in which the temperature in the storage room is maintained at a medium temperature of about 10 ° C. to 20 ° C., a compressor, a condenser, A refrigeration cycle having a cooler and a throttling device, and a machine room that is arranged adjacent to the middle greenhouse and accommodates the compressor, and passes through the heat transfer boundary wall that partitions the machine room and the middle greenhouse. The rate is higher than the heat transfer rate of the other boundary walls that define the medium greenhouse.

  The present invention relates to a heat transfer boundary wall in which a middle greenhouse in which the temperature in the storage chamber is maintained at a medium temperature of about 10 ° C. to 20 ° C. among the plurality of storage chambers is adjacent to the machine room and partitions the middle greenhouse and the machine room. The heat transfer rate of the machine room is higher than the heat transfer rate of the other boundary walls, and the heat of the machine room that has been radiated to the outside of the refrigerator in the past is actively radiated to the inside of the refrigerator, so It is possible to obtain a refrigerator having a middle greenhouse capable of maintaining the temperature.

It is a schematic block diagram (front sectional drawing) of the refrigerator in Embodiment 1 of this invention. It is a schematic block diagram (side sectional drawing) of the refrigerator in Embodiment 1 of this invention. It is a schematic block diagram (top sectional drawing) of the refrigerator in Embodiment 1 of this invention. It is a perspective view of the middle greenhouse in Embodiment 1 of this invention. It is a schematic block diagram of the middle greenhouse in Embodiment 1 of this invention. It is a figure which shows an example of the analysis data of the reached temperature of the middle greenhouse with respect to external air at the time of changing the heat passage rate of the boundary wall with the machine room in Embodiment 1 of this invention. It is a figure which shows an example of the analysis data (outside air 0 degreeC) of the ultimate temperature of the middle greenhouse with respect to the heat insulation performance of the boundary wall with the machine room in Embodiment 1 of this invention. It is a schematic block diagram of the middle greenhouse in Embodiment 2 of this invention. It is a figure which shows an example of the analysis data of the target temperature reach | attainment time of a middle greenhouse with respect to the amount of blowing air of cold air when changing the heat passage rate of the boundary wall with the machine room in Embodiment 2 of this invention. It is a schematic block diagram of the middle greenhouse in Embodiment 3 of this invention. It is a figure which shows an example of the analysis data of the target temperature arrival time of a middle greenhouse with respect to the heat passage rate of the boundary wall with the machine room in Embodiment 3 of this invention. It is a schematic block diagram of the middle greenhouse in Embodiment 4 of this invention.

Embodiment 1 FIG.
1 is a schematic configuration diagram (front cross-sectional view) of a refrigerator according to Embodiment 1 of the present invention, and FIG. 2 is an overview of the refrigerator according to Embodiment 1 of the present invention, taken along the line AA ′ in FIG. It is a block diagram (side sectional drawing). In the following description, front, back, top and bottom, left and right, and front and rear mean directions when the refrigerator is viewed from the front side, that is, from the side where the user performs food storage operation.
As shown in FIG. 1 and FIG. 2, the refrigerator 1000 includes an outer box and an inner box that is housed in the outer box to form the inner wall of the refrigerator, and a heat insulating material made of urethane heat insulating material that is foam-filled between the outer box and the inner box. A plurality of storage rooms are formed in a casing having performance. In the first embodiment, the refrigerator 1000 further includes a middle greenhouse 600.
More specifically, in the refrigerator 1000, an ice making room 200 and a switching room 300 are installed in parallel under the refrigerator room 100 and the cold room 100 from above, and the freezer room 400, the vegetable room 500, and the switching room are placed under the ice making room 200. Below 300, an intermediate greenhouse 600 is provided adjacent to the freezer compartment 400 and the vegetable compartment 500. In addition, an egg chamber 110 and a chilled chamber 120 are partitioned and arranged inside the refrigerator compartment 100, and a middle greenhouse case 601 is installed inside the middle greenhouse 600. The lower middle greenhouse case 601 can be pulled out independently of the upper two middle greenhouse cases 601. In addition, the middle greenhouse 600 generally stores foods that are recommended to be stored in a so-called cold and dark place such as eggplant and cucumber vegetables that cause a low temperature failure at 5 ° C. or lower, and rice that is preferably stored at around 15 ° C. The inside temperature of the middle greenhouse 600 is maintained in a temperature range having a certain range of about 10 to 20 ° C.

  In addition, the refrigerator 1000 includes a refrigeration cycle circuit that cools air supplied to each storage room, and an air passage for supplying air cooled by the refrigeration cycle circuit to each storage room. The air circulating in the warehouse is cooled by the cooler 1002 to cool the food to be stored.

  The refrigeration cycle circuit includes a compressor 1001, a condenser that condenses the refrigerant discharged from the compressor 1001 by dissipating heat (for example, a finned tube heat exchanger), and a throttle device that expands the refrigerant flowing out of the condenser (see FIG. And a cooler 1002 for cooling the air supplied to each storage chamber by the refrigerant expanded by the expansion device. The compressor 1001 is arrange | positioned at the lower part of the back side of the refrigerator 1000, for example. The cooler 1002 is provided in a cooling air passage 1010 described later. The cooling air passage 1010 is provided with air conveying means 1003 for sending air cooled by the cooler 1002 to each storage room and circulating the air in the refrigerator 1000.

FIG. 3 is a schematic configuration diagram (top cross-sectional view) of the refrigerator according to Embodiment 1 of the present invention, taken along the line BB ′ in FIG. 1.
A machine room 700 is formed in the lower part of the back surface of refrigerator 1000 according to the present embodiment, and compressor 1001 is accommodated in machine room 700. In addition, originally, piping is connected from the discharge side of the compressor 1001, but it is omitted here. In the machine room 700, the compressor 1001 is arranged to the right. 2 and 3, the upper end of the middle greenhouse-machine room boundary wall 1a is higher than the upper end of the compressor 1001, and the width of the middle greenhouse-machine room boundary wall 1a is larger than the width of the compressor 1001. It is formed to be wide. Thereby, even if the back surface area where the middle greenhouse 600 adjoins the machine room 700 is about 40%, the heat radiation from the compressor 1001 described later can be effectively used. Note that the entire refrigerator 1000 is covered with a heat insulating material between the inside and the surroundings and is thermally shielded, and heat enters and exits due to the temperature difference between the inside and outside, and the compressor 1001 is a self-heating component that generates a large amount of heat. The temperature in the machine room 700 is determined by the temperature of the outside air and the amount of heat generated by the compressor 1001 regardless of the temperature inside the refrigerator 1000.
In addition, the discharge side of the compressor 1001 is connected to a condenser (not shown) provided on the back of the refrigerator compartment 100 or a water reservoir at the bottom of the refrigerator 1000, and the discharge side of the condenser is the outer box of the refrigerator 1000. Is connected to a heat dissipating pipe (not shown) arranged on the inner side surface of the back surface of the head. Further, a heat insulating material such as a vacuum heat insulating material is interposed between the heat radiating pipe and the inner box.

Next, the operation of the refrigeration cycle circuit will be described.
The refrigerant discharged from the compressor 1001 flows into the condenser and is cooled and condensed. Further, the refrigerant that has flowed out of the condenser is radiated naturally by flowing through the heat radiating pipe, and then flows into the cooler 1002. The refrigerant flowing out of the cooler 1002 flows through the suction pipe and flows into the compressor 1001 in the machine room 700 again.
The heat radiating pipe also has a role of preventing condensation on the outer surface of the refrigerator 1000 due to a temperature difference between the inside of the refrigerator and the outside air, and may be arranged on the side surface as well as the back surface. Further, in order to expand the heat radiation area, the rear surface of the outer box and the heat radiation pipe may be fixed with aluminum tape or the like, or the heat radiation pipe may be bent and disposed. However, if the cooler 1002 and the heat radiating pipe are close to each other, heat from the heat radiating pipe is transmitted to the cooler 1002 and the periphery of the cooler 1002 even if a heat insulating material is interposed, and the cooling capacity of the refrigerator 1000 is reduced. It is preferable to avoid the back surface of the cooler 1002 and concentrate the heat dissipating pipes on the back side of the refrigerating chamber 100 and to keep the heat dissipating pipes away from the cooler 1002 to suppress the heat effect from the heat dissipating pipes.

  The air path for supplying the air cooled by the refrigeration cycle circuit to each storage room is composed of a cooling air path 1010, a return air path 1020, a refrigerating room return air path 101, and the like. The cooling air passage 1010 is a ventilation passage through which the air cooled by the cooler 1002 is conveyed to the refrigerating room 100, the switching room 300, and the freezing room 400. This cooling air passage 1010 is formed in the back surface part of the refrigerator 1000, for example. The return air passage 1020 is a ventilation passage through which air that has cooled each chamber is conveyed to the cooler 1002. The refrigerator compartment return air passage 101 is a ventilation passage through which the air that has cooled the refrigerator compartment 100 is conveyed to the vegetable compartment 500. The air that has cooled the refrigerator compartment 100 is mixed with the air that has cooled the vegetable compartment 500 in a vegetable compartment return air passage (not shown) that is partitioned and arranged on the top of the vegetable compartment 500, and is conveyed to the cooler 1002.

FIG. 4 is a perspective view of the middle greenhouse in the first embodiment of the present invention (the interior is omitted), and FIG. 5 is a schematic configuration diagram of the middle greenhouse in the first embodiment of the present invention.
4 and 4, the middle greenhouse 600 is insulated from the outside air by the middle greenhouse door 602 on the front surface, the middle greenhouse bottom boundary wall 603 on the bottom surface, and the middle greenhouse side boundary wall 604 on the left side. In addition, for the adjacent storage room, on the back side, the middle greenhouse-machine room boundary wall 1a (hereinafter also referred to as “heat transfer boundary wall”) and the upper cooling air passage 1010 (or the lower machine room 700). For the return air passage 1020), the intermediate greenhouse-cooling air passage boundary wall 1b, for the top switching chamber 300, the intermediate greenhouse-switching chamber boundary wall 1c, and on the right side, with respect to the upper freezer compartment 400, Is insulated from the middle greenhouse-freezer compartment boundary wall 1d and the lower vegetable compartment 500 by the middle greenhouse-vegetable compartment boundary wall 1e. 2 and 3, the upper end of the middle greenhouse-machine room boundary wall 1a is higher than the upper end of the compressor 1001, and the width of the middle greenhouse-machine room boundary wall 1a is larger than the width of the compressor 1001. It is formed to be wide. Further, in FIG. 5, the middle greenhouse case 601 can be pulled out to the middle greenhouse door 602 side along a guide jig such as a bearing rail or a roller rail (not shown) and has a detachable configuration. . In FIG. 4, three middle greenhouse cases 601 are installed in order from the smallest to the top, but the size and quantity are not limited thereto.

Next, the operation of the refrigerator according to the first embodiment will be described with reference to FIGS.
In FIG. 1, inside the refrigerator 1000, the internal air cooled by the cooler 1002 is generally conveyed to each storage room by the air conveying means 1003 via the cooling air passage 1010. And the return air after cooling each store room is a circulation air path which returns to the cooler 1002 again via the return air path 1020.

  The air cooled by the cooler 1002 is generally −20 ° C. or lower. For example, by adjusting the amount of air flowing into each storage room or diverting the air after cooling in another storage room, for example, refrigeration The room 100 is about 3 ° C., the chilled room 120 is about 0 ° C., the ice making room 200 is about −10 ° C., the switching room 300 is about −18 to −7 ° C., the freezer room 400 is about −18 ° C., and the vegetable room 500 is 6 The inside temperature of the middle greenhouse 600 is maintained at about 10 to 20 ° C.

  Here, in the refrigerator 1000, the cause of increasing the temperature in the storage chamber is the temperature of the outside air (placement location of the refrigerator 1000 such as the room) that varies depending on the climate, the compressor 1001 that is higher than the outside air temperature, and the condenser. 1004. Therefore, in each store room, in order to suppress these influences, the heat insulation performance is strengthened. Also in the middle greenhouse 600, as shown in FIGS. 4 and 5, the upper rear surface faces the cooling air passage 1010, the top surface faces the switching room 300, the right side faces the freezer room 400, and the vegetable room 500, In other words, it is partitioned by a boundary wall having a heat insulation performance of greater or lesser. However, even if it is insulated by the boundary wall, it is cooled by cold radiation, and even if there is no inflow of cold air, the temperature gradually decreases and becomes lower than the outside air, so that the medium temperature (especially 10 ° C. or higher) is maintained during low outside air. It becomes difficult. In order to maintain the intermediate temperature regardless of the outside air fluctuation, it is necessary to change the heat balance by changing the heat balance. For this reason, in the first embodiment, the middle greenhouse 600 and the machine room that is hotter than the outside air. By reducing the heat insulation performance of the heat transfer boundary wall that partitions between 700 (generally outside air temperature + 20 ° C.), exhaust heat from the compressor 1001 and the like housed in the machine room 700 is positively stored. Dissipate heat inside.

Next, the relationship between the heat transfer rate, the outside air temperature, and the temperature reached by the middle greenhouse 600 will be described.
FIG. 6 is an example of analysis data of the reached temperature of the middle greenhouse 600 relative to the outside air temperature (= initial temperature of the middle greenhouse) when the heat passage rate of the middle greenhouse-machine room boundary wall 1a is changed. As shown in FIG. 1 to FIG. 5, when the middle greenhouse 600 is installed adjacent to the freezer compartment 400 and the vegetable compartment 500 (volume 40 L, 40% of the rear surface area is adjacent to the machine room 700), the outside air and the intermediate greenhouse temperature (B) is the figure which assumes that the vegetable room 500 whole is replaced with the middle greenhouse 600 (volume 100L, the total back surface area is adjacent to the machine room 700), and an intermediate | middle greenhouse reached temperature. It is a figure which shows the relationship. In the figure, the horizontal axis is the outside air temperature, the vertical axis is the temperature reached in the middle greenhouse, 21a in the figure is the heat transfer rate of the heat transfer boundary wall 6.4 W / m ² K, 21b is the heat transfer rate 4.1 W when / ^{m 2} K, 21c when the heat transfer coefficient 2.6W / ^{m 2} K, 21d denotes a data when the heat transfer coefficient 0.5W / ^{m 2} K. Moreover, 22 in a figure has shown the medium greenhouse target set temperature range (= 10-20 degreeC). As for other boundary walls other than the heat transfer boundary wall, as a general heat insulating material, a middle greenhouse-cooling air passage boundary wall 1b, a middle greenhouse-switching room boundary wall 1c, a middle greenhouse-freezer compartment boundary wall 1d, For the greenhouse-vegetable room boundary wall 1e, foamed polystyrene (heat transmission rate 1.0 to 1.5 W / m ² K), for the middle greenhouse door 602, and for the middle greenhouse bottom boundary wall 603, urethane (heat transmission rate 0.5W / m ² K), and the intermediate wall side boundary wall 604 is assumed to be a vacuum heat insulating material (heat transmission rate of about 0.1 W / m ² K).

As shown in FIG. 6A, by increasing the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a, that is, by reducing the heat insulation performance, the temperature of the intermediate greenhouse 600 is affected by the exhaust heat from the machine room 700 when the outside air is low. It is shown that the temperature is higher than the outside air temperature and is lower than the outside air temperature due to the cold radiation from the other storage chambers when the outside air is high. In particular, when the heat passage rate is 4.1 W / m ² K and when the heat passage rate is 2.6 W / m ² K, the ultimate temperature is 5 ° C. higher than the outside air temperature when the outside temperature is low, and 10 ° C. above the outside temperature when the outside temperature is high. Since the temperature is lower, it is possible to obtain a temperature range that reproduces a cold and dark place. Therefore, by storing in the middle greenhouse 600 foods that should be stored in a cool and dark place, such as oil and dry matter that have been stored in the refrigerator room 100, and subtropical crops that have been stored in the vegetable room 500, low temperature damage can be prevented. It is possible to suppress and improve the storage quality. Moreover, since the cooling load is reduced to store the food at a higher temperature, an energy saving effect is also obtained.
As shown in FIG. 6B, when the contact area with the machine room 700 is large, the influence of outside air and the machine room 700 is excessively larger than that in FIG. When the heat transfer rate is large, the temperature reached becomes higher, and the temperature of the middle greenhouse 600 becomes higher than the outside air temperature not only in the low outside air but also in the high outside air. Therefore, it is necessary to optimize the contact area with the machine room 700. There is.

Next, the heat transmission rate for maintaining the middle greenhouse 600 in the middle temperature range without adding a cooling system will be described.
In the refrigerator 1000 in which no heat source exists, it is most difficult to form a storage room in an intermediate temperature range when the storage room is maintained at 10 ° C. or higher when the outside air is 10 ° C. or lower. 1 uses the exhaust heat of the compressor 1001 as a means for raising the temperature to 10 ° C. or higher, so that the heat insulation performance of the intermediate greenhouse-machine room boundary wall 1a is lowered. FIG. 7 is an example of analysis data of the reached temperature of the middle greenhouse 600 with respect to the heat insulation performance of the middle greenhouse-machine room boundary wall 1a when the outside air temperature (= initial temperature of the middle greenhouse) is 0 ° C. The figure which shows the relationship of the ultimate temperature with respect to the heat passage rate of a boundary wall, (b) is a figure which shows the relationship of the ultimate temperature with respect to the thermal resistance of a boundary wall. 23a in the figure, when the middle greenhouse 600 is installed adjacent to the freezer compartment 400 and the vegetable compartment 500 as shown in FIGS. 1 to 5 (volume 40L, 40% of the back surface area is adjacent to the machine room 700), 23b Is data when it is assumed that the whole vegetable room 500 is replaced with the middle greenhouse 600 (volume 100 L, total rear surface area is adjacent to the machine room 700).

From FIG. 7, the temperature of the middle greenhouse 600 rises due to the effect of exhaust heat from the machine room 700 as the heat insulation performance of the middle greenhouse-machine room boundary wall 1a is lowered. In order to make the temperature of the middle greenhouse 600 reach the target set temperature range 22 in both cases where the vegetable room 500 is replaced as a whole when it is installed adjacent to 500, the heat transmission rate is set as shown in FIG. It is shown that it is necessary to set thermal resistance to 0.19 m ² K / W or less from 5.3 W / m ² K or more and FIG. 7B. However, the thermal resistance shown in FIG. 7B is difficult to set because the ultimate temperature 23 changes rapidly at 0.5 m ² K / W or less. In consideration of a slight variation in the heat transfer area, it is set to 5.5 W / m ² K or more (the amount of heat passing per 1 K temperature difference from the machine room 700 is 0.17 W or more). The temperature of 600 can be raised to 10 ° C. or higher. That is, without adding a heat source such as a heater or a dedicated cooling system, it is possible to raise the temperature of the middle greenhouse 600 to an intermediate temperature range regardless of the outside air temperature.

As described above, in the first embodiment, the machine room 700 and the middle greenhouse 600 are adjacent to each other, and the heat of the machine room 700 that has conventionally radiated heat to the outside of the refrigerator 1000 is actively radiated to the interior. Thus, the inside greenhouse was set to a middle greenhouse 600 that maintained a temperature of about 10 ° C to 20 ° C. As a result, the middle greenhouse 600 is brought into a temperature state influenced by the temperature of the machine room 700 as well as the outside air. Therefore, even if the outside greenhouse temperature is set at a low temperature such that the temperature of the installation place is 10 ° C. or less. Since the middle greenhouse 600 can be maintained in a certain temperature range, a highly reliable apparatus for maintaining the quality of the stored food can be obtained.
In addition, since the heat from the machine room 700 is actively dissipated, the temperature of the machine room 700 is less likely to rise than in the prior art. As a result, the performance of the compressor 1001 disposed in the machine room 700 is not affected by the installation conditions such as the outside air temperature, so that the cooling efficiency of the refrigerator 1000 is improved.

  Moreover, since the storage room of a freezing temperature zone, a refrigeration temperature zone, and an intermediate temperature zone is provided, various foods can be stored at an optimum temperature. As a result, the waste of the operation of the refrigeration cycle can be eliminated by moving the food that has been stored in the freezer compartment 400 or the vegetable compartment 500 and has been excessively cooled into the middle greenhouse 600, so that the refrigerator 1000 as a whole can be removed. This reduces the cooling load and saves energy. In addition, as the shape of the middle greenhouse 600, it is possible to store rice, oil, etc. that have been left in the open air so far, as well as to suppress the propagation of germs. It is possible to improve the organization.

  Furthermore, in the present embodiment, the heat transfer rate is made to be higher than that of other boundary walls by changing the material or thinning the middle greenhouse-machine room boundary wall 1a partitioning between the machine room 700 and the middle greenhouse 600. Enlarge and actively transmit the heat of the machine room 700 to the middle greenhouse 600. Therefore, a middle greenhouse-machine that partitions a machine room and an adjacent storage room, which have been formed to be particularly thick by using a large amount of heat insulating material so that heat from the compressor 1001 is not transmitted to the inside of the chamber. Since the room boundary wall 1a can be thinned, the amount of the heat insulating material can be reduced, and the storage space of the middle greenhouse 600 can be increased by expanding the interior of the chamber by the amount of the reduced heat insulating material.

  In addition, the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a is increased, and the heat of the machine room 700 is actively dissipated to the intermediate greenhouse 600. Therefore, the number and length of the heat radiation pipes conventionally used for heat dissipation are reduced. can do. Therefore, the amount of heat insulating material such as vacuum heat insulating material provided to prevent heat from the heat radiating pipe from being transmitted into the refrigerator can be reduced, and the storage space can be increased by expanding the interior by the amount of the reduced heat insulating material. it can. In addition, by reducing the number and length of the heat radiating pipes, it is possible to afford to dispose the heat radiating pipes away from the cooler, so that the heat radiating pipe does not interfere with the cooler, specifically avoiding the back of the cooler. By arranging the pipe, the influence of heat from the heat radiating pipe to the cooler can be reduced, and the cooling capacity is improved.

Further, by setting the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a to 5.5 W / m ² K or more, the intermediate greenhouse 600 can be moved by outside air without adding a heat source such as a heater or a dedicated cooling system. Without increasing the temperature, it is possible to raise the temperature to an intermediate temperature range.

In addition, at least a part of the middle greenhouse 600 is arranged on the compressor 1001 side, that is, when the middle greenhouse 600 shown in FIGS. In this case, the middle greenhouse 600 is also arranged close to the right, so that the heat from the compressor 1001 having the largest heat radiation amount in the machine room 700 can be effectively radiated to the middle greenhouse 600. Thereby, even if the back surface area where the middle greenhouse 600 is adjacent to the machine room 700 is about 40%, the middle temperature can be maintained regardless of the influence of the outside air temperature.
Further, the upper end of the middle greenhouse-machine room boundary wall 1a is higher than the upper end of the compressor 1001, and the width of the middle greenhouse-machine room boundary wall 1a is wider than the width of the compressor 1001, The heat of the single-layer compressor 1001 can be effectively radiated to the middle greenhouse 600.

  Moreover, in FIGS. 1-5, although the middle greenhouse 600 is installed as another storage room adjacent to the freezer compartment 400 and the vegetable compartment 500, as shown in FIG. 501 and the vegetable room intermediate temperature case 502 may be installed, and the heat passage rate of the vegetable room lower-machine room boundary wall 503 only on the back surface of the vegetable room intermediate temperature case 502 may be increased, that is, the heat insulation performance may be reduced. In this case, the same effect can be obtained without the trouble of forming a new storage chamber.

Embodiment 2. FIG.
FIG. 8 is a schematic configuration diagram of a middle greenhouse in the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the location similar to Embodiment 1, and the description is abbreviate | omitted.
In FIG. 8, the blower outlet 2 and the suction inlet 3 are formed in the intermediate greenhouse-cooling air path boundary wall 1b. The air cooled by the cooler 1002 is transported to the middle greenhouse 600 by the air transport means 1003, flows into the middle greenhouse 600 from the outlet 2, cools the middle greenhouse 600, is discharged from the inlet 3, and returns to the It is conveyed to the cooler 1002 via the path 1020. Moreover, the blower outlet damper 5 for opening and closing the blower outlet 2 is provided in the vicinity of the intermediate greenhouse-cooling air passage boundary wall 1b where the blower outlet 2 is formed, and the blower outlet damper 5 is rotated or moved. It drives by the blower outlet damper drive means 6 to be made. Further, an air temperature detecting means 4 for detecting the air temperature in the medium greenhouse 600 is installed in the middle greenhouse case 601 arranged at the lowermost side, and based on the detection value of the air temperature detecting means 4. Then, the blowout outlet damper driving means 6 is driven by the cold air supply amount control means 7.

Next, the operation of the second embodiment will be described. Regarding the operation, description of the same parts as those in the first embodiment will be omitted.
The middle greenhouse 600 has a lower back portion in contact with the machine room 700 via the middle greenhouse-machine room boundary wall 1a, so that the heat transfer rate of the middle greenhouse-machine room boundary wall 1a is increased, that is, the heat insulation performance is lowered. Thus, the temperature of the middle greenhouse 600 becomes higher than the outside air due to the effect of exhaust heat from the machine room 700 when the outside air is low, and can reach the middle temperature range (about 10 ° C. to 20 ° C.) even when the outside air is 0 ° C. It becomes. On the other hand, when the outside air temperature becomes high, as shown in FIG. 6 of the first embodiment, when the heat insulating performance of the intermediate greenhouse-machine room boundary wall 1a is low, the temperature of the intermediate greenhouse 600 is 20 ° C. or higher. It rises up to and goes out of the intermediate temperature range. In particular, as shown in FIG. 6B, when the contact area with the machine room 700 is large, the influence of the outside air temperature and the machine room 700 becomes excessively large, and the temperature of the middle greenhouse 600 is higher than that of the outside air. Get higher.

  Therefore, as shown in FIG. 8, the temperature in the middle greenhouse 600 is detected by the air temperature detection means 4, and the cold air supply amount control means 7 is in the middle greenhouse target set temperature range 22 shown in FIG. 6 of the first embodiment. When it is received that the upper limit of 20 ° C. has been received, the blower outlet drive means 6 is driven to open the blower outlet damper 5, whereby cold air is supplied from the blower outlet 2, and the temperature of the middle greenhouse 600 is 20 When the temperature drops below a degree Celsius and drops to some extent, the temperature in the middle greenhouse 600 is maintained in the middle greenhouse target set temperature range 22 by driving the outlet damper driving means 6 again and closing the outlet damper 5. Is possible. In addition, although the example which opens and closes the blower outlet damper 5 by using 20 degreeC which is the upper limit of the medium greenhouse target set temperature range 22 as the reference temperature was shown above, the reference temperature may be within the medium greenhouse target set temperature range 22. For example, a certain range such as 15 ± 2 ° C. may be set and controlled.

Next, the relationship between the heat transmission rate, the amount of air blown from the outlet 2 and the time required to reach the target temperature of the middle greenhouse 600 will be described.
FIG. 9 shows that the amount of cool air blown from the middle greenhouse outlet 2 and the temperature of the middle greenhouse 600 reach the middle greenhouse target set temperature range 22 when the heat passage rate of the middle greenhouse-machine room boundary wall 1a is changed. It is an example of the analysis data of the time until. 24a when the heat transfer boundary wall heat transfer coefficient 8.3W / ^{m 2} K, 24b when the 5.0W / ^{m 2} K, 24c when the 4.1W / ^{m 2} K, 24d is 2.6 W / m is data obtained when the ^{2 K.} Other analysis conditions are the same as those in the first embodiment (FIGS. 6 and 7).

From FIG. 9, the larger the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a, that is, the lower the heat insulation performance, the greater the amount of cool air blown out necessary to reach the intermediate greenhouse target set temperature range 22, and the arrival time. However, even in the case of 8.3 W / m ² K where the heat transfer rate is the largest, it is within 1 hour by supplying cold air of about 0.05 m ³ / h (about 1/5 of the chilled chamber 120 blowing air volume) It is shown that it is possible to reach the middle greenhouse target set temperature range 22.
Therefore, as in the first embodiment, the heat passing rate of the intermediate greenhouse-machine room boundary wall 1a is set large (about 5.5 to 8.0 W / m ² K), and a small amount of cold air (0.01 to In addition to the effects of the first embodiment, a heat source such as a heater and a dedicated cooling system are added in addition to the effects of the first embodiment by supplying 0.05 m ³ / h) Without this, it becomes possible to maintain the medium greenhouse target set temperature range 22 (about 10 to 20 ° C.) more accurately and without depending on the outside air temperature.

  In addition, in this Embodiment 2, although the example which installed the blower outlet 2 in the middle greenhouse-cooling wind path boundary wall 1b was demonstrated, the blower outlet 2 is a boundary wall with the freezer compartment 400, and the middle greenhouse-freezer compartment boundary You may install in the wall 1d. Since the freezer compartment 400 is also as low as the cooling air passage 1010, it can reach the middle greenhouse target set temperature range 22 with a small amount of cold air supply, and the same effect can be obtained. Since the cool air is supplied from the downstream side of the chamber 400, it is possible to maintain the air volume balance between the other storage chambers.

  Similarly, the air outlet 2 may be installed in the middle greenhouse-vegetable room boundary wall 1e, which is a boundary wall with the vegetable room 500. By providing the air outlet 2 in the vegetable compartment 500, it is possible to maintain the air volume balance between the other storage compartments similarly to the freezer compartment 400, and the water evaporated from the food stored in the vegetable compartment 500 is also supplied. Therefore, the effect that the inside of the inside greenhouse 600 becomes high humidity and the freshness of a foodstuff is maintained is acquired.

  Further, in the second embodiment, the air temperature detection means 4 is installed in the middle greenhouse case 601 disposed at the lowermost side in the middle greenhouse 600, but a typical air temperature in the middle greenhouse 600 is If it can be detected, it may be installed anywhere. As shown in FIG. 8, it is possible to detect an increase in the air temperature in the intermediate greenhouse 600 earlier by suppressing the temperature increase by supplying cool air when it is installed near the boundary wall 1a where the temperature is highest. However, even if the air temperature detecting means 4 is installed at a higher position, for example, at the center of the middle greenhouse 600, the same effect can be obtained if the reference temperature for opening and closing the air outlet damper 5 is set lower.

Embodiment 3 FIG.
FIG. 10 is a schematic configuration diagram of a middle greenhouse in the third embodiment of the present invention. In addition, about the location similar to Embodiment 1-2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
In FIG. 10, a bypass pipe 8 branched from a main line of a refrigerant pipe connecting the compressor 1001 and a condenser (not shown) is disposed in the middle greenhouse 600. Further, the bypass pipe 8 is provided with an on-off valve 9 for switching the supply of the refrigerant to the bypass pipe 8 and a check valve 10 for preventing a reverse flow of the refrigerant from the main line to the bypass pipe 8. On the basis of the detected value of 4, the on-off valve 9 is provided by the refrigerant supply switching means 11.

Next, the operation according to the third embodiment will be described. Regarding the operation, the description of the same parts as in the first and second embodiments will be omitted.
The middle greenhouse 600 has a lower back portion in contact with the machine room 700 via the middle greenhouse-machine room boundary wall 1a, so that the heat transfer rate of the middle greenhouse-machine room boundary wall 1a is increased, that is, the heat insulation performance is lowered. Thus, the temperature of the middle greenhouse 600 becomes higher than the outside air due to the effect of exhaust heat from the machine room 700 when the outside air is low, and can reach the middle temperature range (about 10 ° C. to 20 ° C.) even when the outside air is 0 ° C. It becomes. However, when the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a is too large, or as shown in FIG. 5B of the first embodiment, the contact area with the machine room 700 is large. The influence of the outside air and the machine room 700 becomes excessively large, and the temperature of the middle greenhouse 600 becomes higher than the outside air, so that a certain amount of heat insulation performance is required, and as a result, it takes time to reach the middle temperature range. .

Next, the relationship between the heat transmission rate and the arrival time to the target temperature of the middle greenhouse 600 will be described.
FIG. 11 is an example of analysis data of the time until the temperature of the middle greenhouse 600 reaches the middle greenhouse target set temperature range 22 (10 ° C. or higher) with respect to the heat transmission rate of the middle greenhouse-machine room boundary wall 1a. Reference numeral 25 denotes data on the target temperature arrival time with respect to the heat passage rate of the intermediate greenhouse-machine room boundary wall 1a. Other analysis conditions are the same as those in the first embodiment (FIGS. 5 and 6).

From FIG. 11, the heat transfer rate of the intermediate greenhouse-machine room boundary wall 1a is larger, that is, the lower the heat insulation performance, the shorter the arrival time for rising to the intermediate greenhouse target set temperature range 22, but the boundary wall heat transfer rate about 3 hours even at 8.3 W / ^{m 2} K, in the case of 4.1 W / ^{m 2} K, it has been shown to take reach to more than 2 days. At this time, the amount of heat required to raise the temperature in the middle greenhouse 600 (40 L) from 0 ° C. to 10 ° C. is 500 J. In order to reach the temperature within one hour, a heat amount of about 0.14 W may be applied, and the influence of cold radiation. Even if it considers, 5-10W should just be a heat generating body.

  Therefore, as shown in FIG. 10, when the temperature in the middle greenhouse 600 is detected by the air temperature detection unit 4, and the refrigerant supply switching unit 11 determines that the temperature is 10 ° C. or less which is the lower limit of the middle greenhouse target set temperature range 22. Opens the on-off valve 9, supplies the high-temperature refrigerant discharged from the compressor into the bypass pipe 8, and closes the on-off valve 9 again when the temperature reaches 10 ° C. Thereby, in this Embodiment 3, in addition to the effect obtained in Embodiment 1, it becomes possible to raise the temperature of the intermediate greenhouse 600 in a short time. In addition, although the example which opens and closes the on-off valve 9 by making 10 degreeC which is the minimum of the inside greenhouse target set temperature range 22 into the reference temperature was shown above, the reference temperature is set a little lower than 10 degreeC and the temperature rises too much. It may be suppressed.

  Moreover, in this Embodiment 3, although the middle greenhouse outlet 2 is installed in the middle greenhouse-cooling wind path boundary wall 1b, the middle greenhouse-freezer compartment boundary wall 1d which is a boundary wall with the freezer compartment 400 is provided. May be installed. Since the freezer compartment 400 is also as low as the cooling air passage 1010, it can reach the middle greenhouse target set temperature range 22 with a small amount of cold air supply, and the same effect can be obtained. Since the cool air is supplied from the downstream side of the chamber 400, it is possible to maintain the air volume balance between the other storage chambers.

  In the third embodiment, the supply of cold air is not performed. However, as in the second embodiment, the air outlet damper 5, the damper driving means 6, and the cold air supply amount control means 7 are installed to detect the air temperature. The means 4 may be used in combination with the upper limit side of the medium greenhouse target set temperature range 22 to control the amount of cold air by opening and closing the blowout damper 5. Thereby, the temperature in the inside greenhouse 600 can be reached and maintained in the inside greenhouse target set temperature range 22 in a short time from both the low temperature side and the high temperature side.

  In the third embodiment, the air temperature detecting means 4 is installed in the middle greenhouse case 601 disposed on the uppermost side in the middle greenhouse 600, but the typical air temperature in the middle greenhouse 600 is If it can be detected, it may be installed anywhere. As shown in FIG. 10, when the temperature is lower than the lowest temperature in the middle greenhouse-machine room boundary wall 1a, the air temperature in the middle greenhouse 600 can be detected earlier, and the temperature can be shortened by supplying the refrigerant. Even if the air temperature detecting means 4 is installed further downward, for example, at the center of the middle greenhouse 600, the same effect can be obtained if the reference temperature for opening and closing the on-off valve 9 is set higher.

Embodiment 4 FIG.
FIG. 12 is a schematic configuration diagram of a middle greenhouse in the fourth embodiment of the present invention.
In FIG. 12, the same portions as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted. A heat conductive plate 12 made of a metal having a high thermal conductivity such as a metal such as aluminum or stainless steel or a high heat conductive resin is installed on the entire back surface of the middle greenhouse 600.

Next, the operation will be described with reference to FIG. Regarding the operation, description of the same parts as in the first to third embodiments will be omitted.
The middle greenhouse 600 has a lower back portion in contact with the machine room 700 via the middle greenhouse-machine room boundary wall 1a, so that the heat transfer rate of the middle greenhouse-machine room boundary wall 1a is increased, that is, the heat insulation performance is lowered. Accordingly, the temperature of the middle greenhouse 600 becomes higher than the outside air temperature due to the effect of exhaust heat from the machine room 700 when the outside air is low, and can reach the middle temperature range (10 ° C. or higher) even when the outside air is 0 ° C. . At this time, in this Embodiment 4, since the heat conductive plate 12 with high heat conductivity is installed in the whole back surface of the middle greenhouse 600 in contact with the middle greenhouse-machine room boundary wall 1a, In addition to the effects obtained in Form 1, it is possible to raise the temperature of the entire middle greenhouse 600 uniformly.

  Further, although the cool air is not supplied in the fourth embodiment, the air temperature detecting means 4, the blowout damper 5, the damper driving means 6, and the cool air supply amount control means 7 are installed as in the second embodiment. Then, the amount of cold air may be controlled by opening and closing the air outlet damper 5 according to the detection value of the air temperature detecting means 4. Thereby, the temperature in the inside greenhouse 600 can be reached and maintained in the inside greenhouse target set temperature range 22 in a short time from both the low temperature side and the high temperature side.

Note that the embodiments of the present invention may be implemented in combination as appropriate.

  1a Middle greenhouse-machine room boundary wall, 1b Middle greenhouse-cooling airway boundary wall, 1c Middle greenhouse-switching room boundary wall, 1d Middle greenhouse-freezer room boundary wall, 1e Middle greenhouse-vegetable room boundary wall, 2 Medium greenhouse blowing Outlet, 3 Medium greenhouse intake, 4 Air temperature detection means, 5 Outlet damper, 6 Outlet damper drive means, 7 Cold air supply control means, 8 Bypass piping, 9 Open / close valve, 10 Check valve, 11 Refrigerant supply switching Means, 12 thermally conductive plate, 100 refrigerator compartment, 101 refrigerator compartment return air channel, 110 egg compartment, 120 chilled compartment, 200 ice making compartment, 300 switching room, 400 freezer compartment, 500 vegetable compartment, 501 vegetable compartment refrigerated case, 502 Vegetable room medium temperature case, 503 Vegetable room lower part-machine room boundary wall, 504 Vegetable room return air channel, 600 medium greenhouse, 601 medium greenhouse case, 602 medium greenhouse door, 603 medium greenhouse bottom boundary wall, 604 Middle greenhouse side wall, 700 Machine room, 1000 Refrigerator, 1001 Compressor, 1002 Cooler, 1003 Air conveying means, 1010 Cooling air passage, 1020 Return air passage.

Claims (11)

A plurality of storage rooms including a middle greenhouse formed in a case having heat insulation performance and maintained at a medium temperature of about 10 ° C. to 20 ° C.
A refrigeration cycle having a compressor, a condenser, a cooler, a throttling device;
A machine room arranged adjacent to the middle greenhouse and containing the compressor,
A refrigerator characterized in that a heat transfer rate of a heat transfer boundary wall partitioning between the machine room and the middle greenhouse is higher than a heat transfer rate of other boundary walls partitioning the middle greenhouse.   The refrigerator according to claim 1, wherein a part of the middle greenhouse is disposed on the compressor side.   The refrigerator according to claim 2, wherein an upper end of the heat transfer boundary wall is higher than an upper end of the compressor, and a width of the heat transfer boundary wall is wider than a width of the compressor. The material and thickness of the heat transfer boundary wall are configured such that the heat transfer rate of the heat transfer boundary wall is 5.5 W / m ² K or more. The refrigerator in any one. A temperature detecting means provided in the middle greenhouse for detecting the temperature in the middle greenhouse;
Air conveying means for conveying the air cooled by the cooler to the plurality of storage chambers;
A blower outlet formed in the middle greenhouse and supplied with air conveyed from the air conveying means,
A suction port formed in the middle greenhouse, wherein the air in the middle greenhouse is discharged and conveyed to the cooler;
Outlet opening / closing means for opening and closing the outlet;
The apparatus according to claim 1, further comprising: a cool air supply amount control means for controlling the air outlet opening / closing means so that the temperature in the storage chamber detected by the temperature detection means is about 20 ° C or less. Item 5. The refrigerator according to any one of Items 4.   6. The refrigerator according to claim 5, wherein at least one of the plurality of storage chambers is a freezing chamber, and the air supplied from the air outlet is through the freezing chamber.   6. The refrigerator according to claim 5, wherein at least one of the plurality of storage rooms is a vegetable room, and the air supplied from the air outlet is via the vegetable room. In the refrigerant pipe between the compressor and the condenser, a bypass pipe and an on-off valve that switches refrigerant inflow to the bypass pipe are provided,
The bypass pipe is installed in the middle greenhouse,
8. The refrigerant supply switching means for opening the on-off valve when the temperature in the middle greenhouse detected by the temperature detection means is about 10 ° C. or less. The refrigerator according to crab.   The refrigerator according to any one of claims 1 to 8, wherein the heat transfer boundary wall is provided with a plate made of a good heat conductive material such as metal or high heat conductive resin.   The refrigerator according to any one of claims 1 to 9, wherein the middle greenhouse is disposed at a lowermost portion of the refrigerator and is disposed adjacent to the vegetable compartment and the freezer compartment.   11. The vegetable room is divided into at least two or more regions having different storage temperatures, and one of the divided regions is the middle greenhouse. The refrigerator described.

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