JP6452378B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator.

  Various foods are stored in a refrigerator for home use or the like. When a user purchases food sold in a refrigerated state or a frozen state in a supermarket or the like, the user stores the food in a storage room having a temperature corresponding to each food in the refrigerator. However, the refrigerator compartment is not necessarily limited to this. Rather, the refrigerator compartment is required to have a function of storing food cooked at home, such as meal leftovers.

  In general, the cooked food is cooled to room temperature and then stored in a refrigerator room. However, for example, a user who cannot secure a sufficient cooking time due to circumstances such as double working or nursing care may be forced to leave the cooked food with insufficient cooling. If this is a summer season, food that has been cooked may continue to be hot and rot. In such a case, food that has not been cooled to room temperature is stored in the refrigerator. When such a high temperature food is stored in the refrigerator, it is necessary to quickly lower the temperature in the cabinet so as not to adversely affect the preservation of other foods.

  Patent Document 1 discloses a first storage container, a second storage container disposed in the vicinity of the first storage container, and cold air supply means for introducing cold air from the cooler to the second storage container. The cool air supply path provided separately, the cool air outflow path provided separately from the cool air outflow means for returning the cool air after cooling the second storage container to the cooler, and the second storage container The refrigerator provided with the blower only for the 2nd storage container to send is described. In addition, in the same document, even when warm food is stored in the second storage container, cool air is concentrated and sent to the warm food, and the air in the second storage container is stirred to rapidly cool the food. Therefore, it is described that warm food can be stored in the refrigerator.

JP 2002-90029 (paragraphs [0041], [0047], FIG. 3, FIG. 4)

  However, in the refrigerator of Patent Document 1, when food with a high temperature is stored in the second storage container, the blower dedicated to the second storage chamber operates, so that the warm air in the initial stage of cooling is rather high in the first wind speed. It hits the floor of the storage container. As a result, there is a problem that the freshness of the food in contact with the floor surface of the first storage container may be reduced even if the temperature rise is not appreciable by the thermistor of the first storage container. It was.

  The present invention has been made to solve the above-described problems, and provides a refrigerator that can reduce the influence on other storage items in a storage room when storing a high-temperature storage item in the storage room. The purpose is to do.

The refrigerator according to the present invention includes a storage chamber partially including a specific cooling space, a cooling chamber that generates cool air supplied to the storage chamber, and a return air passage that returns air in the cooling space to the cooling chamber. An induction fan that attracts air in the cooling space and draws it into the return air passage, load amount detecting means for detecting a load amount of the cooling space, and a ceiling surface or a floor surface of the cooling space, and a vertical direction and shelves movable movable, have a, and control means for controlling the induction fan on the basis of the load, the load sensing means, rack position sensor for detecting the vertical position of the shelves Is included .

  According to the present invention, since the air in the cooling space that is a part of the storage room can be drawn into the return air passage by the induction fan, the high temperature storage can be achieved by accommodating the high temperature storage in the cooling space. It is possible to reduce the influence on the other storage items in the storage room from the storage item.

It is a front view which shows schematic structure of the refrigerator 1 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the refrigerator 1 which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of the process performed with the control apparatus 30 of the refrigerator 1 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the principal part structure of the refrigerator 1 which concerns on the modification of Embodiment 1 of this invention.

Embodiment 1 FIG.
A refrigerator according to Embodiment 1 of the present invention will be described. FIG. 1 is a front view showing a schematic configuration of a refrigerator 1 according to the present embodiment. In FIG. 1, illustration of doors provided in each storage chamber is omitted. FIG. 2 is a cross-sectional view showing a schematic configuration of refrigerator 1 according to the present embodiment. In the present embodiment, a household refrigerator is illustrated as the refrigerator 1. In FIGS. 1 and 2, the dimensional relationship and shape of each component may differ from the actual one. Moreover, the positional relationship (for example, vertical relationship etc.) between each structural member in a specification is a thing when installing the refrigerator 1 in the state which can be used in principle.

  As shown in FIG.1 and FIG.2, the refrigerator 1 has the heat insulation box 10 by which the front surface (front) was opened and the storage space was formed in the inside. The heat insulation box 10 has a steel outer box, a resin inner box, and a heat insulating material filled in a space between the outer box and the inner box. The storage space formed inside the heat insulating box 10 is partitioned into a plurality of storage chambers by one or a plurality of partition members formed using a heat insulating member such as urethane foam. Stored items such as food are stored in each storage room. The refrigerator 1 of this example is disposed as a plurality of storage rooms adjacent to the refrigerating room 11 disposed at the top, the switching room 12 disposed below the refrigerating room 11, and the side of the switching room 12. An ice making room 13, a freezing room 14 disposed below the switching room 12 and the ice making room 13, a bottom vegetable room 15 disposed below the freezing room 14 and storing vegetables, large plastic bottles, and the like; It has. A chilled chamber 16 is provided as a storage chamber in a part of the refrigerator compartment 11 (lower part in this example). Each storage chamber is provided with a thermistor (not shown) for detecting the temperature. Each thermistor outputs a temperature detection signal to the control device 30 described later.

  The opening formed in the front surface of the refrigerator compartment 11 is provided with a rotary (for example, double door) door 17 that opens and closes the opening. An operation panel 31 is provided on the outer surface of the door 17 which is the front surface of the refrigerator 1. The operation panel 31 includes, for example, an operation unit for a user to perform a setting operation such as a cold insulation temperature of each storage room including the switching room 12, a display unit that displays information such as the temperature of each storage room, and an alarm sound. And a speaker for outputting sound. The operation panel 31 may include a touch panel that doubles as an operation unit and a display unit. The operation panel 31 outputs setting information such as a cold insulation temperature set by the user to the control device 30 described later. For example, a drawer-type door that opens and closes the opening is provided in the opening formed in the front surface of each of the switching chamber 12, the ice making chamber 13, the freezing chamber 14, and the vegetable chamber 15. Each storage chamber is provided with a door open / close sensor that detects the open / closed state of each door. Each door opening / closing sensor outputs a door opening / closing signal to the control device 30 described later. For example, when the door is open for a certain period of time, an alarm sound is output from the speaker of the operation panel 31 under the control of the control device 30. This alerts the user that the door is open.

  On the back side of the refrigerator 1, a cooling chamber 26 that generates cold air supplied to each storage chamber is provided. In the cooling chamber 26, a cooler 21 (evaporator) is provided. Moreover, the compressor 20 is provided in the exterior of each storage room and the cooling room 26 among the back sides of the refrigerator 1. FIG. The compressor 20 and the cooler 21 constitute a refrigeration cycle together with a condenser and a decompression device (not shown). Between the cooling chamber 26 and each storage chamber, the ventilation air path 23 and the air blower 22 which ventilates cool air to the ventilation air path 23 are provided. In addition, return air passages 24 and 25 are provided between the cooling chamber 26 and each storage chamber to return the air in each storage chamber to the cooling chamber 26. The cold air produced by the cooler 21 by the operation of the refrigeration cycle is blown by the blower 22 and supplied to each storage chamber through the blower air passage 23. The cool air warmed by cooling each storage chamber is sucked from the suction ports 12a, 13a, 16a, etc. provided in each storage chamber, and passes through the return air passages 24, 25 to the cooling chamber 26 (upstream of the cooler 21). Return to the side. In FIG. 1, the flow direction of the cool air returning to the cooling chamber 26 is indicated by a white thick arrow. The cold air that has returned to the cooling chamber 26 passes through the cooler 21, is cooled, and is blown to each storage chamber again.

  The control device 30 (an example of control means) has a microcomputer including a CPU, a ROM, a RAM, an I / O port, a timer, and the like. Based on the temperature detection signal input from each thermistor and the setting information input from the operation panel 31, the control device 30 performs control so that the temperature of each storage chamber approaches the set temperature. For example, the control device 30 controls the opening degree of dampers (not shown) installed at various locations of the blower air passage 23, the output of the compressor 20, the air volume of the blower 22, and the like. In addition, the control device 30 includes a communication unit capable of communicating with an external device via a wired or wireless connection, and can transmit / receive data to / from a mobile terminal such as a smartphone or a personal computer, for example. It has become. Thereby, the user can perform the instruction | indication of a preset temperature change and the confirmation of the condition in a store | warehouse | chamber using a smart phone etc.

  A specific cooling space 40 is provided in a part of the refrigerator compartment 11. The cooling space 40 is, for example, a space for accommodating and cooling a container containing food having a temperature higher than room temperature (hereinafter, the container and food in the container may be referred to as “hot storage”). The cooling space 40 in this example is provided adjacent to the upper side of the chilled chamber 16. Further, the cooling space 40 of this example is not provided with a drawer-type door (for example, a door dedicated to the cooling space 40). For this reason, the cooling space 40 is an open space opened to the front side by opening the door 17 of the refrigerator compartment 11. Here, the air outlet 27 through which the cold air is blown out from the blower air passage 23 into the refrigerator compartment 11 is provided in a space other than the cooling space 40.

  A suction port is provided on the back surface of the cooling space 40, and an induction fan 41 different from the blower 22 is provided in the suction port. The induction fan 41 attracts the cool air in the cooling space 40 to the return air passage 24 and returns the attracted cool air to the cooling chamber 26 via the return air passage 24. Since the induction fan 41 is provided, the cooling space 40 is arranged on the downstream side in the refrigerator compartment 11 in the flow of cold air. It is desirable that the cooling space 40 be arranged on the most downstream side in the refrigerator compartment 11 in the flow of cold air. In the configuration of this example, the cool air blown into the refrigerator compartment 11 cools relatively low-temperature food in the refrigerator compartment 11 other than the refrigerator space 40 and then flows into the refrigerator space 40, and is stored at a high temperature in the refrigerator space 40. Cool things. The air that has cooled the high-temperature storage in the cooling space 40 does not flow back to the refrigerating chamber 11 other than the cooling space 40 and returns to the cooling chamber 26 via the return air passage 24. Therefore, when a high-temperature store is accommodated in the cooling space 40, the influence on other foods accommodated in the refrigerator compartment 11 other than the cooling space 40 can be reduced.

  In the return air passage 24, a temperature sensor 45 (an example of load amount detection means) that detects the temperature of air in the cooling space 40 attracted by the induction fan 41 is provided. The temperature sensor 45 outputs a detection signal to the control device 30. The temperature sensor 45 may be provided in the cooling space 40 (for example, in the vicinity of the induction fan 41).

  In addition, a laminated plate 42 is provided on the floor surface on which the high-temperature stored item is placed in the cooling space 40. The laminated plate 42 has, for example, a shape and a size that match the assumed planar shape and size of the high-temperature storage. The laminated plate 42 has a configuration in which an upper layer portion 42a and a lower layer portion 42b are laminated. The lower layer part 42b is formed of a material having a relatively low thermal conductivity and a high heat insulating property (for example, a foam material). The upper layer part 42a is formed of a material (for example, a metal such as aluminum) having a higher thermal conductivity than the lower layer part 42b. That is, the upper surface of the laminated plate 42 is constituted by an upper layer portion 42a having a high thermal conductivity, and the lower surface of the laminated plate 42 is constituted by a lower layer portion 42b having a high heat insulating property. By increasing the heat insulating property of the lower layer part 42b, it is possible to suppress heat radiation from the high-temperature stored item to the lower chilled chamber 16. Further, by increasing the thermal conductivity of the upper layer portion 42a, the heat from the high-temperature stored product can be planarly dispersed throughout the upper layer portion 42a, so that the heat is removed by the air flow generated by the induction fan 41. It can be made easier. Furthermore, by forming the upper layer portion 42a with a metal having a metallic luster, the position of the cooling space 40 can be visually recognized by the user. Here, the upper layer part 42a may be provided with heat radiating fins or the like to increase the surface area so that heat from the high-temperature stored item can be dispersed more quickly.

  In this example, the shelf 43 that forms the ceiling surface of the cooling space 40 is a movable shelf that can move in the vertical direction. In FIG. 1, an example of a movable range of the shelf 43 is indicated by a broken-line double arrow. A knob that slides in the left-right direction is provided on the front side (front side) portion of the shelf 43. The vertical position of the shelf 43 is adjusted by the horizontal position of the knob. As a result, the user can manually adjust the height of the shelf 43 according to the height of the high-temperature stored item stored in the cooling space 40. In order to suppress the heat of the high-temperature storage from being radiated to the space on the shelf 43, it is desirable that the shelf 43 be provided with a heat insulating structure. For example, a heat insulating material such as a foam material may be provided on the lower surface of the shelf 43, or the shelf 43 may have a double upper and lower structure with an air layer interposed therebetween.

  Optical sensors 44 (another example of load amount detection means; an example of a shelf position sensor) that detect the vertical position of the shelf 43 are provided on both side surfaces of the refrigerator compartment 11 across the shelf 43. The optical sensor 44 is attached to the other inner wall surface of the refrigerator compartment 11 so as to face each light emitting portion 44a, and a plurality of light emitting portions 44a that are arranged in the vertical direction and attached to one inner wall surface of the refrigerator compartment 11. And a plurality of light receiving portions 44b. The optical sensor 44 is configured to output a detection signal to the control device 30.

  FIG. 3 is a flowchart illustrating an example of processing executed by the control device 30. The process shown in FIG. 3 is repeatedly executed at predetermined time intervals during the operation of the refrigerator 1. In the initial state, it is assumed that the attracting fan 41 is stopped.

  First, in step S1, it is determined whether opening / closing of the door 17 of the refrigerator compartment 11 is detected. For example, when the control device 30 detects that the door 17 is changed from the closed state to the open state based on the door open / close signal from the door open / close sensor of the refrigerator compartment 11, the control device 30 opens / closes the door 17. It is determined that it has been detected. If opening / closing of the door 17 is detected, the process proceeds to step S2. If opening / closing of the door 17 is not detected, the process is terminated as it is. Thereby, the process of step S1 is repeated at predetermined time intervals until the opening / closing of the door 17 is detected.

  In step S <b> 2, the vertical position S_position of the shelf 43 detected by the optical sensor 44 is acquired. The position of the shelf 43 in the vertical direction is adjusted according to the height of the high-temperature stored item when the user stores the high-temperature stored item in the cooling space 40, for example.

  Next, in step S3, the temperature Tt of the air in the cooling space 40 detected by the temperature sensor 45 is acquired.

  Next, in step S4, the operation time V_Max_time of the induction fan 41 is calculated based on the position S_position of the shelf 43 and the temperature Tt in the cooling space 40. A calculation formula (V_Max_time = f (S_position, Tt)) of the operation time V_Max_time is stored in advance in the ROM of the control device 30. Here, the minimum value of the operation time V_Max_time is zero.

  The height of the hot stored product can be estimated from the position S_position of the shelf 43, and the heat capacity of the hot stored product can be estimated from the height of the hot stored product. Therefore, the heat capacity of the high-temperature stored item can be estimated based on the position S_position of the shelf 43. Moreover, since the average temperature of the refrigerator compartment 11 is about 3 degreeC, the temperature of the air which flows into the cooling space 40 from the refrigerator compartment 11 by the induction fan 41 can also be considered to be about 3 degreeC. For this reason, the temperature of the high-temperature stored item can be estimated based on the temperature Tt of the air in the cooling space 40. Furthermore, based on the heat capacity and temperature of the high-temperature stored item, the time required for cooling the high-temperature stored item (the operation time of the induction fan 41) can be calculated. Therefore, in this example, the operation time V_Max_time of the induction fan 41 is calculated based on the position S_position of the shelf 43 and the temperature Tt in the cooling space 40.

  The operation time V_Max_time of the attracting fan 41 may be calculated based only on the position S_position of the shelf 43 (that is, the heat capacity of the high-temperature stored item). In this case, since the temperature sensor 45 is unnecessary, the refrigerator 1 having a simpler configuration and less expensive can be realized. Further, the operation time V_Max_time of the attracting fan 41 may be calculated based only on the temperature Tt in the cooling space 40 (that is, the temperature of the high-temperature stored item). In this case, since the optical sensor 44 is not required, the refrigerator 1 having a simpler configuration and less expensive can be realized.

  In step S5 following step S4, it is determined whether or not the operation time V_Max_time is greater than zero. When it is determined that the operation time V_Max_time is greater than 0, the process proceeds to step S6, and when it is determined that the operation time V_Max_time is 0, the process ends.

  In step S6, the operation of the induction fan 41 is started and the actual operation time V_time of the induction fan 41 is reset to 0 (V_time = 0).

  Next, in step S7, the time step dt is added to the actual operation time V_time of the attracting fan 41.

  Next, in step S8, it is determined whether or not the actual operation time V_time of the attracting fan 41 is greater than the operation time V_Max_time calculated in step S4. When it is determined that the actual operation time V_time is greater than the operation time V_Max_time, the process proceeds to step S9, and when it is determined that the actual operation time V_time is equal to or less than the operation time V_Max_time, the process returns to step S7.

  In step S9, the attracting fan 41 is stopped. At this time, a buzzer sound or the like may be output from the speaker of the operation panel 31 to notify that the cooling of the high-temperature stored item is completed. Moreover, since a user may house a high temperature store in a refrigerator for unavoidable going out, it is fully considered that the user is not around the refrigerator when cooling of the high temperature store is completed. For this reason, you may make it notify a smart phone via a communication means that cooling of the high temperature store thing was complete | finished.

  Here, the induction fan 41 may be operated at a constant rotation speed, or may be operated at a variable rotation speed based on the load amount of the cooling space 40 (for example, at least one of the heat capacity and temperature of the high-temperature storage). May be.

  As described above, the refrigerator 1 according to the present embodiment includes the refrigerating room 11 that includes a specific cooling space 40 in a part thereof, the cooling room 26 that generates cold air supplied to the refrigerating room 11, and the cooling space 40. The return air passage 24 returns the air to the cooling chamber 26, and the induction fan 41 attracts the air in the cooling space 40 and draws it into the return air passage 24.

  According to this configuration, the induction fan 41 that attracts the air in the cooling space 40 that is a part of the refrigerator compartment 11 and draws it into the return air passage 24 is provided. It can be arranged downstream in the flow. Therefore, by storing a high-temperature stored product having a temperature higher than room temperature in the cooling space 40, another stored product stored in the refrigerator compartment 11 other than the cooling space 40 from the high-temperature stored product stored in the cooling space 40. Can be reduced.

  Further, the refrigerator 1 according to the present embodiment has a load amount detection means (for example, an optical sensor 44 and a temperature sensor 45) that detects the load amount of the cooling space 40 (for example, at least one of the heat capacity and the temperature of the high-temperature storage). And a control device 30 for controlling the attracting fan 41 based on the load amount.

  According to this configuration, the operation time (or rotation speed) of the induction fan 41 can be appropriately set according to the load amount of the cooling space 40, insufficient cooling of the high-temperature stored item, and unnecessary operation of the induction fan 41. (For example, the operation of the induction fan 41 after the high-temperature stored item is cooled to the temperature in the refrigerator compartment 11) can be avoided. Therefore, it is possible to more reliably reduce the influence of the high-temperature stored item stored in the cooling space 40 on other stored items stored in the refrigerator compartment 11 other than the cooling space 40. Moreover, since the power consumption of the induction fan 41 can be reduced, the energy saving of the refrigerator 1 can be achieved.

  Moreover, in this Embodiment, since the cooling space 40 is an open space in which the drawer-type door etc. are not provided, a user's effort at the time of accommodating a high temperature store in the cooling space 40 is reduced. be able to.

  Moreover, in this Embodiment, since the ceiling surface of the cooling space 40 is comprised by the movable shelf 43, the height of the cooling space 40 can be set according to the magnitude | size of a high temperature store. Therefore, the convenience of the cooling space 40 can be improved, and the inside of the cooling space 40 can be cooled with high energy efficiency.

  FIG. 4 is a cross-sectional view showing the main configuration of the refrigerator 1 according to a modification of the present embodiment. FIG. 4 shows the cooling space 40 and the surrounding structure. As shown in FIG. 4, in this modification, the floor surface (for example, laminated board 42) of the cooling space 40 is provided so as to be rotatable in a horizontal plane. For example, the output shaft of the motor 46 is connected to the center of the laminated plate 42. The motor 46 is fixed to a shelf 47 that partitions between the cooling space 40 and the storage chamber below it. The operation of the motor 46 is controlled by the control device 30. For example, the motor 46 is controlled to start rotating when the operation of the attracting fan 41 starts and to stop when the attracting fan 41 stops. In this case, the laminated plate 42 rotates during the operation period of the attracting fan 41 and stops during the stop period of the attracting fan 41.

  According to this configuration, since the floor surface on which the high-temperature stored item is placed can be rotated, the high-temperature stored item can be rotated between the upstream portion and the downstream portion of the induced airflow by the induction fan 41. Uneven cooling can be prevented. Therefore, the high-temperature stored item accommodated in the cooling space 40 can be cooled more uniformly and efficiently.

Other embodiments.
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above-described embodiment, the configuration in which the cooling space 40 is provided in a part of the refrigeration room 11 is taken as an example. However, the cooling space 40 is one of other storage rooms such as the freezer room 14 or the vegetable room 15. It may be provided in the part.

  Moreover, in the said embodiment, although the heat capacity of a high temperature stored item is estimated based on the height of a high temperature stored item, the heat capacity of a high temperature stored item is estimated based on the width | variety, depth, weight, etc. of a high temperature stored item. May be.

  In the above-described embodiment, the configuration in which the height of the movable shelf 43 is manually adjusted has been described as an example. However, a drive mechanism that drives the shelf 43 in the vertical direction may be provided. For example, after the high temperature storage is accommodated in the cooling space 40 and the door 17 is closed, the shelf 43 is moved in the vertical direction by the driving mechanism, and the shelf 43 is moved when the lower surface of the shelf 43 contacts or approaches the high temperature storage. May be stopped. Thereby, the convenience of the refrigerator 1 can further be improved.

  Further, in the above embodiment, the operation time of the induction fan 41 may be changed based on the detected temperature of the refrigerator compartment 11 other than the cooling space 40. For example, when the set temperature of the refrigerating room 11 is switched or set to the rapid cooling mode, and the average temperature of the refrigerating room 11 greatly fluctuates from a normal temperature (for example, 3 ° C.), the operation of the induction fan 41 is performed. The time may be extended or shortened based on the temperature of the refrigerator compartment 11. Thereby, since the operation time of the induction fan 41 can be set more appropriately, insufficient cooling of the high-temperature stored item and useless operation of the induction fan 41 can be avoided.

  Moreover, in the said embodiment, although the structure which made the shelf 43 which comprises the ceiling surface of the cooling space 40 movable was mentioned as an example, the shelf which comprises the floor surface of the cooling space 40 may be made movable.

  Moreover, in the said embodiment, although the structure where the attracting fan 41 was provided in the suction inlet of the cooling space 40 was mentioned as an example, the attracting fan 41 may be provided in the middle of the return air path 24. FIG.

  In addition, the above embodiments and modifications can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 Refrigerator, 10 Heat insulation box, 11 Refrigeration room, 12 Switching room, 12a, 13a, 16a Inlet, 13 Ice making room, 14 Freezing room, 15 Vegetable room, 16 Chilled room, 17 Door, 20 Compressor, 21 Cooler , 22 Blower, 23 Blower air passage, 24, 25 Return air passage, 26 Cooling chamber, 27 Outlet, 30 Control device, 31 Operation panel, 40 Cooling space, 41 Induction fan, 42 Laminate plate, 42a Upper layer portion, 42b Lower layer Part, 43 shelves, 44 light sensor, 44a light emitting part, 44b light receiving part, 45 temperature sensor, 46 motor, 47 shelf.

Claims (5)

A storage room partially equipped with a specific cooling space;
A cooling chamber for generating cold air to be supplied to the storage chamber;
A return air path for returning the air in the cooling space to the cooling chamber;
An induction fan that draws air in the cooling space and draws it into the return air path;
Load amount detection means for detecting the load amount of the cooling space;
A movable shelf that constitutes the ceiling surface or floor surface of the cooling space and is movable in the vertical direction;
Control means for controlling the attracting fan based on the load amount;
I have a,
The refrigerator according to claim 1, wherein the load amount detection unit includes a shelf position sensor that detects a vertical position of the shelf . The refrigerator according to claim 1 , wherein the load amount detection unit includes a temperature sensor that detects a temperature of the cooling space. On the floor surface of the cooling space, a laminated plate having an upper layer portion and a lower layer portion is provided,
The refrigerator according to claim 1 or 2 , wherein the upper layer part is formed of a material having higher thermal conductivity than the lower layer part. The upper layer part is made of metal,
The refrigerator according to claim 3 , wherein the lower layer portion is formed of a heat insulating material. The floor surface of the cooling space is rotatably provided in a horizontal plane,
The refrigerator according to any one of claims 1 to 4 , further comprising a motor that rotationally drives the floor surface.

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