JP2006145094A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator of high convenience by comprising a temperature switching chamber having a heat retention function besides a general cooling storage function. <P>SOLUTION: This refrigerator 1 comprises a cooling device generating cold air, a storage chamber, the temperature switching chamber 3 capable of switching a chamber temperature, an air introduction ventilation flue 12 for distributing the cold air to the temperature switching chamber 3, a return ventilation flue for distributing the air in the temperature switching chamber 3 to the cooling device, a heater 15 mounted on a bottom portion of the temperature switching chamber 3, a metallic plate 30 mounted on an installation face of the heater 15, and a control portion for controlling the heater 15 to keep the temperature of the temperature switching chamber 3 to 50-80°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator provided with a temperature switching chamber.

  In recent years, in addition to a freezing room and a refrigerating room, a refrigerator provided with a switching room that can be switched to a low temperature range such as freezing, refrigerating, partial, and chilled according to the user's application has been put on the market.

For example, Patent Document 1 discloses a refrigerator in which the damper device is closed and the heater device is energized by the heater control means if the temperature of the switching chamber is lower than the set temperature. Thereby, when switching the switching chamber to a temperature range (partial or chilled) other than refrigeration and refrigeration, the refrigeration temperature can be reasonably maintained at an appropriate temperature.
Japanese Patent Laid-Open No. 10-288440

  In recent years, where the living environment has changed significantly, more and more families have different times for their families to eat. Therefore, conventionally, a heat insulating box and a storage container have been used separately from the refrigerator. However, this has a problem that the frequency of the transfer of food becomes high and the storage place becomes complicated. Therefore, apart from general partial and chilled uses, it is desired to realize a high-temperature switching room such as temporary heat preservation of cooked foods and warm cooking in winter.

  An object of the present invention is to provide a highly convenient refrigerator by including a temperature switching chamber having a heat retaining function in addition to a general cooling storage function.

  In order to achieve the above object, the refrigerator of the present invention includes a cooling device that generates cold air, a storage room, a temperature switching room that can switch room temperature, an introduction ventilation path that passes cold air to the temperature switching room, and the temperature. A return ventilation path for ventilating the air in the switching chamber to the cooling device; a heater disposed at the bottom of the temperature switching chamber; a metal plate provided around the heater; and a controller for controlling the heater. .

  According to this configuration, the temperature switching chamber is a low-temperature chamber that can be frozen, partial, chilled, refrigerated, etc. if cold air from the cooling device is introduced, while the heater is driven to temporarily heat the cooked food. It becomes a high temperature room where you can cook in winter. Moreover, the heat generated by the heater can be efficiently transmitted by the metal plate, and the heating efficiency is improved.

  In the refrigerator, it is preferable that the heater is provided with a bottom surface and a space of the temperature switching chamber, and the metal plate is provided on a surface opposite to the bottom surface of the temperature switching chamber of the heater. When the heat radiating surface of the heater reaches the vicinity of the temperature switching chamber, there is a risk of burns to the user, but the risk can be reduced by covering the upper surface of the heater with a metal plate. In addition, by providing a space below the heater, the heater 15 and the inner wall of the temperature switching chamber are thermally insulated and the temperature rise of the inner wall is suppressed, and deformation of the inner wall can be prevented. Furthermore, it is possible to suppress the thermal influence on other cooling chambers that are separated from the inner wall.

  In the refrigerator described above, it is preferable that at least a bottom surface is provided with a metal storage case in the temperature switching chamber.

  According to this configuration, since the heater is provided below the storage case, heating can be efficiently performed from the bottom surface of the storage case. Further, it is possible to prevent the bottom surface of the storage case from being deformed by the weight of the food stored in the storage case during heating. Furthermore, there is no risk of thermal deformation even if a cooking utensil (such as a frying pan or a pan) immediately after being cooked is placed directly on the storage case.

  In the refrigerator, it is preferable that a gap between the storage case and the side surface and the bottom surface of the temperature switching chamber is 7 mm or less.

  According to this configuration, since the user cannot easily touch the metal plate, safety is improved.

  In the refrigerator, it is preferable that a means for detecting that the storage case is placed in the temperature switching chamber is provided, and the control unit controls the heater based on the detection result.

  According to this configuration, if the energization of the heater is stopped when it is detected that the storage case is not installed, for example, when the storage case is taken out for cleaning of the storage case, the user is in trouble. This reduces the risk of burns from touching metal plates.

  In the refrigerator, it is desirable to provide a metal shelf in the temperature switching chamber.

  According to this configuration, the food storage capacity is improved. In addition, by using the mesh, air in the temperature switching room can easily convect at both low and high temperatures, and the room temperature can be kept uniform. Furthermore, when the net shelf is made of metal, when the food is placed at a high temperature, deformation due to the weight of the food can be prevented.

  In the refrigerator, the control unit preferably sets the room temperature of the temperature switching chamber to 50 to 80 ° C.

  According to this configuration, by controlling the temperature switching chamber to 50 ° C. or higher, it is possible to prevent the propagation of various germs. On the other hand, by controlling the temperature switching chamber to 80 ° C. or lower, it is possible to use resin parts (heat resistant temperature 80 ° C.) that are generally used in refrigerators, and an inexpensive design is possible.

  According to the present invention, it is possible to provide a highly convenient refrigerator by including a temperature switching chamber having a heat retaining function in addition to a general cooling storage function. In addition, by devising the arrangement and drive control of the heater in the temperature switching chamber, a safe refrigerator free from the risk of burns can be provided.

  Fig.1 (a) is a front view of a refrigerator, FIG.1 (b) is a right view of a refrigerator. The refrigerator 1 includes a plurality of storage rooms such as a refrigerator room, an ice making room, a vegetable room, a freezer room, and a chilled room. Refrigerator 1 has a refrigerator compartment 2 having a double door at the top, a temperature switching room 3 that can switch the room temperature in a range of about −15 ° C. to 80 ° C. on the left side of the center, an ice making room 4 on the right side of the center, and a vegetable on the lower left The freezing room 6 is arranged on the right side of the room 5 and the lower part. A chilled chamber 23 maintained at a chilled temperature zone (about 0 ° C.) is provided in the lower part of the refrigerator compartment 2.

  FIG. 2 is a transparent view of FIG. In each room, a storage case and a storage shelf are provided for ease of use. FIG. 3 is a right side view of the vicinity of the temperature switching chamber. The temperature switching chamber 3 is surrounded by a partition 7 with the refrigerator compartment 2 on the upper surface, a partition 8 with the vegetable compartment 5 on the lower surface, an openable door 9 on the front surface, and a heat insulating wall 10 on the rear surface. A drawer-type storage case 11 is housed in the temperature switching chamber 3. The storage case 11 is slidably supported by rails 32 a and 32 b provided on the left and right inner walls of the temperature switching chamber 3 and is detachably supported.

  The lower part 11a including the bottom surface of the storage case 11 is made of metal, and the upper part is made of resin. This is because the heater 15 is provided below the storage case 11 as will be described later, so that heating from the bottom surface of the storage case 11 is efficiently performed. Moreover, it is for preventing that the bottom face of the storage case 11 deform | transforms with the weight of the food stored in the storage case 11 at the time of a heating. Furthermore, there is no risk of thermal deformation even if a cooking utensil (such as a frying pan or a pan) immediately after being cooked is placed directly on the storage case 11. Further, if the storage case 11 is entirely made of resin, the volume of the storage case 11 varies greatly between low temperature and high temperature, so that rattling occurs between the storage case 11 and the rails 32a and 32b at low temperatures. Sometimes, there arises a problem that the clearance between the storage case 11 and the rails 32a and 32b disappears and it is difficult to pull out. Note that at least the bottom surface of the storage case 11 may be made of metal, for example, all may be made of metal.

  A metal net shelf 33 is provided above the storage case 11 in the temperature switching chamber 3. The net shelf 33 is slidably supported by one of two sets of net shelf rails 34 a to 34 d provided on the left and right inner walls of the temperature switching chamber 3. Thus, by providing the net shelf 33, the food storage capacity is improved. Further, by using a mesh, air in the temperature switching chamber 3 is easily convected at both low and high temperatures, and the room temperature can be kept uniform. Furthermore, when the net shelf 33 is made of metal, when food is placed at a high temperature, deformation due to the weight of the food can be prevented.

  As means for detecting that the storage case 11 is placed in the temperature switching chamber 3, a magnet 35 is provided on the back surface of the storage case 11, and a reed switch is provided on the inner wall of the temperature switching chamber 3 facing the magnet 35. 36. When the storage case 11 is stored in the temperature switching chamber 3, the magnet 35 and the reed switch 36 are in contact with each other, and when the storage case 11 is pulled out or taken out of the room, the magnet 35 and the reed switch 36 are in contact. And leave. Then, by detecting the contact state with the magnet 35 with the reed switch 36, it is determined whether or not the storage case 11 is placed in the temperature switching chamber 3.

  Here, when the storage case 11 is not placed in the temperature switching chamber 3, it is desirable to control so that the heater 15 is not energized. This is because when the storage case 11 is taken out for cleaning or the like of the storage case 11, the risk of the user touching the metal plate 30 described later and being burned is reduced.

  Between the storage case 11 and the heat insulation wall 10, the 1st introduction ventilation path 12 which ventilates the cold air | gas generated with the evaporator mentioned later to the temperature switching chamber 3 is provided. The first introduction ventilation path 12 is provided with a first damper 13 that allows the temperature switching chamber 3 and the first introduction ventilation path 12 to communicate with each other. By opening and closing the first damper 13, the amount of air flowing from the first introduction ventilation path 12 to the temperature switching chamber 3 is adjusted.

  A fan motor 14 is provided in the first introduction ventilation path 12 between the first damper 13 and the temperature switching chamber 3. The fan motor 14 agitates the air in the temperature switching chamber 3 efficiently. The fan motor 14 may be provided in the temperature switching chamber 3. The fan motor 14 is preferably arranged so as to blow air on the surface of the heater 15 described later. This is because the surface temperature of the heater is lowered to improve safety.

  A heater 15 is provided at the bottom of the temperature switching chamber 3. Since the heated air is heated from the bottom of the temperature switching chamber 3 and the heated air rises indoors, the temperature distribution in the room tends to be uniform. The heater 15 is attached to the metal plate 30. Since the heat generated in the heater 15 is transmitted to the metal plate having good thermal conductivity, the heating efficiency is improved. The metal plate 30 is attached to the bottom of the temperature switching chamber 3. At this time, the heater 15 is preferably disposed between the metal plate 30 and the partition 8. With this configuration, there is no possibility that the user directly touches the heater 15 to cause burns, and the heater 15 is hidden, so that the appearance is good. It is desirable to provide a space 31 between the heater 15 and the partition 8. By providing the space 31, the heater 15 and the partition 8 are thermally insulated from each other, the temperature rise of the partition 8 is suppressed, and deformation of the partition 8 can be prevented. Furthermore, the heat influence to the vegetable compartment 5 which separated the partition 8 can also be suppressed.

  The heater 15 does not necessarily have to be directly attached to the metal plate 30, and the metal plate 30 may be provided around the heater 15. In this case, the heating efficiency is sufficiently improved. A plurality of metal plates may be provided. By providing a space in the partition 8 on the opposite side to the heater 15 through a metal plate different from the metal plate 30, the radiant heat can be blocked.

  Further, it is desirable that the metal plate 30 is disposed so that the bottom surface of the storage case 11 contacts the top surface of the metal plate 30. Thereby, the heat generated by the heater 15 is efficiently conducted to the food in the storage case 11 through the metal plate 30 and the metal on the bottom surface of the storage case 11. Furthermore, since the storage case 11 can be supported not only by the rails 32a and 32b but also by the bottom surface, deformation of the storage case 11 due to the weight of food can be prevented.

  Moreover, it is desirable that the clearance between the storage case 11 and the side surface and the bottom surface of the temperature switching chamber 3 is 7 mm or less. Thereby, only about 10 mm of test fingers specified in the Electrical Appliance and Material Safety Law are inserted into the gap. That is, the user cannot easily touch the metal plate 30. Therefore, safety is improved.

  The driving of the heater 15 is controlled by a control unit (not shown) provided outside the temperature switching chamber 3. Moreover, you may provide an auxiliary heater in the side surface of the temperature switching chamber 3, a back surface, and a top | upper surface. Thereby, a heating speed can be raised and the temperature distribution in the temperature switching chamber 3 at the time of high temperature can be made uniform. The heater 15 may be a heat radiation heater such as a glass tube heater or a heat conduction heater such as an aluminum vapor deposition heater.

  As the heater 15, a sheet-like aluminum vapor deposition heater is general because it is inexpensive and space-saving. However, when the temperature switching chamber 3 is set to a high temperature for heat retention, the heat conduction method has a slow heating speed, and it takes a long time to pass the temperature range of 30 to 45 ° C., which is the growth temperature range of food poisoning bacteria. It is not preferable. Therefore, in order to increase the heating speed, the heater capacity may be increased, and the heat resistance temperature accompanying the increase in the heater capacity is secured by using the metal plate 30 to which the heater is attached. In addition, since the heat conduction method requires a wide heat dissipation surface and the heat dissipation surface extends to the vicinity of the temperature switching chamber 3, there is a risk of burns to the user. However, by covering the upper surface of the heater 15 with the metal plate 30, there is a risk. Reduced.

  On the other hand, in the case of a heat radiation type heater, the heating speed is fast, which is advantageous for food hygiene. Moreover, since the volume is large but the area is small, for example, if it is arranged in the back of the temperature switching chamber 3, there is less risk of a user being burned. In particular, when a heat radiation heater is used, even if the metal plate 30 and the heater 15 are not in contact with each other, heat can be transmitted to the metal plate 30 with sufficient efficiency if the metal plate 30 is provided around the heater 15.

  A temperature sensor 16 is provided on the inner wall of the temperature switching chamber 3. The temperature sensor 16 detects the temperature in the temperature switching chamber 3 and sends it to the controller. Based on this detected temperature, the control unit controls the driving of the heater 15, the opening / closing of the first damper 13, and the fan motor 14 to keep the temperature switching chamber 3 at the set temperature.

  FIG. 4 is a transparent view of the central portion and the lower portion of the refrigerator of FIG. 1A, and FIG. 5 is a block diagram showing the configuration of the cool air circuit of the refrigerator. In the figure, the arrows indicate the flow of cold air. A cooling device including a compressor (not shown) and an evaporator 17 is provided at the lower back of the refrigerator 10. A refrigerant such as isobutane is sealed in the evaporator 17. And a refrigerant | coolant vaporizes in the evaporator 17, the surrounding heat of the evaporator 17 is taken, ambient air is cooled, and it becomes cold air.

  A fan motor 18 for blowing cool air generated in the evaporator 17 to each chamber is provided on the back surface of the freezer chamber 6. The fan motor 18 and the temperature switching chamber 3 are communicated with each other through the first introduction ventilation path 12 as described above, and cool air flows in the direction of arrow A. A first return ventilation path 19 for ventilating the air in the temperature switching chamber 3 to the evaporator 17 is provided. A second damper 20 that communicates the temperature switching chamber 3 and the first return ventilation path 19 is provided on the temperature switching chamber 3 side of the first return ventilation path 19. By opening and closing the second damper 20, the air volume of the air exiting from the temperature switching chamber 3 is adjusted. At this time, the cold air flows in the direction of arrow B, merges with arrow D described later, and flows in the direction of arrow C.

  Further, the fan motor 18 and the ice making chamber 4 are communicated with each other through an air passage (not shown), and the ice making chamber 4 and the freezing chamber 6 are communicated with each other through an air passage (not shown). Then, the fan motor 18 blows cold air in the order of the ice making chamber 4 and the freezing chamber 6. A second return ventilation path 21 for ventilating the air in the freezer compartment 6 to the evaporator 17 is provided. A third damper 22 that communicates the freezer compartment 6 and the second return air passage 21 is provided on the free return chamber 21 side of the second return air passage 21. By opening and closing the third damper 22, the air volume of the air coming out of the freezer compartment 6 is adjusted.

  In addition, a second introduction ventilation path 24 for ventilating the cool air of the evaporator 17 to the chilled chamber 23 is provided. The second introduction ventilation path 24 is provided with a fourth damper 25 that allows the chilled chamber 23 and the second introduction ventilation path 24 to communicate with each other. By opening and closing the fourth damper 25, the amount of air flowing from the second introduction ventilation path 24 to the chilled chamber 23 is adjusted. At this time, the cold air flows in the direction of arrow E.

  In addition, a third introduction ventilation path 26 for ventilating the cool air of the evaporator 17 to the refrigerator compartment 2 is provided. The third introduction ventilation path 26 is provided with a fifth damper 27 that allows the refrigerator compartment 2 and the third introduction ventilation path 26 to communicate with each other. By opening and closing the fifth damper 27, the amount of air flowing from the third introduction ventilation path 26 to the refrigerator compartment 2 is adjusted. Furthermore, a fan motor 28 is provided in the third introduction ventilation path 26 on the refrigerator compartment 2 side of the fifth damper 27. The fan motor 28 agitates the air in the refrigerator compartment 2 efficiently. Note that the fan motor 28 may be provided in the refrigerator compartment 2. At this time, the cold air flows in the direction of arrow F.

  Moreover, the refrigerator compartment 2 and the chilled room 23, and the vegetable compartment 5 are connected by the ventilation path (not shown). The ventilation path which came out of the refrigerator compartment 2 and the chilled compartment 23 is connected to the opening part provided in the lower left of the back surface of the refrigerator compartment 2, and is connected to the vegetable compartment 5 through this opening part through the back surface of the temperature switching chamber 3. Yes. At this time, the cold air flows in the direction of arrow G. Further, the vegetable compartment 5 and the evaporator 17 are communicated with each other through a ventilation path (also used as the first return ventilation path 19). At this time, the cool air flows in the direction of arrow D, merges with the arrow B described above, and flows in the direction of arrow C.

  In addition, you may provide a damper in the vegetable compartment 5 side of the ventilation path which connects the vegetable compartment 5 and the evaporator 17. FIG. Thereby, it is possible to prevent the hot air from the temperature switching chamber 3 from flowing back into the vegetable chamber 5.

  Next, the temperature range that can be set in the temperature switching chamber 3 will be described. Usually, it can set to each temperature zone, such as refrigeration, partial, chilled, refrigeration, for example, -15 degreeC, -8 degreeC, 0 degreeC, 3 degreeC, and 8 degreeC like usual. In this case, the first damper 13 may be opened to introduce the cool air from the evaporator 17 into the temperature switching chamber 3. Furthermore, since the temperature switching chamber 3 includes the heater 15, the temperature switching chamber 3 can be kept at a high temperature, and can be used for temporarily maintaining cooked foods or cooking. Here, the high temperature is preferably as high as possible in order to prevent the propagation of various bacteria from the viewpoint of keeping food warm, and needs to be higher than 30 to 45 ° C. which is the growth temperature of main food poisoning bacteria. In consideration of this, the heater capacity tolerance and the temperature distribution in the temperature switching chamber 3 need to be set higher by about 5 ° C. Therefore, 50 degreeC can be made into the minimum temperature of heat retention.

  For sterilization of food poisoning bacteria, for example, enterohemorrhagic E. coli (pathogenic E. coli O157) requires heating at 75 ° C. for 1 minute. Therefore, by adding 5 ° C. in the same manner as described above, the maximum temperature of heat retention can be set to 80 ° C. as a guide. Here, considering that the heat-resistant temperature of resin parts generally used in refrigerators is 80 ° C., the maximum temperature for heat insulation can be determined as 80 ° C. From the above, considering the safe keeping of foods and the inexpensive design of peripheral parts, preventing the propagation of various bacteria, the set temperature of the temperature switching chamber 3 for keeping warm can be set to 50 to 80 ° C.

In addition, the test result regarding the sterilization of food poisoning bacteria is as follows. In the initial state, Escherichia coli 2.4 × 10 ³ CFU / ml, Staphylococcus aureus 2.0 × 10 ³ CFU / ml, Salmonella 2.1 × 10 ³ CFU / ml, Vibrio parahaemolyticus 1.5 × 10 ³ CFU / ml A sample containing Cereus 4.0 × 10 ³ CFU / ml was heated from 3 ° C. to 55 ° C. over 40 minutes, incubated at 55 ° C. for 3.5 hours, and then over 80 minutes from 55 ° C. to 3 ° C. The amount of each bacterium was examined again. As a result, all the bacteria were reduced to a level of 10 CFU / ml or less (not detected). From this experimental result, it can be said that there is a sufficient sterilization effect at 55 ° C. Therefore, 55 ° C. can be used as the set temperature for keeping the temperature in the temperature switching chamber 3.

  Next, operation control of each damper etc. is demonstrated. When the temperature switching chamber 3 needs to be cooled, the evaporator 17 and the fan motor 18 are driven, and the first damper 13 and the second damper 20 are opened. It returns to the evaporator 17 through the inside. At this time, when the fan motor 14 is driven, the fan motor 14 is quickly cooled, but it is not always necessary to drive it. When the temperature switching chamber 3 is cooled to the set temperature, the first damper 13 is closed to prevent overcooling. The second damper 20 does not need to be closed, but it is preferable to close the second damper 20 to prevent the outflow of cold air.

  On the other hand, when warming is required to keep the temperature in the temperature switching chamber 3, the first damper 13 and the second damper 20 are closed and the heater 15 is driven. And if it heats to preset temperature, the heater 15 will be stopped. During the heat insulation, the indoor temperature can be kept uniform by driving the fan motor 14. Further, the fan motor 14 can prevent an increase in the heater surface temperature, which is a weak point of the heat radiation type. In the conventional refrigerator, since the second damper 20 is not provided, the temperature switching chamber 3 and the evaporator 17 are always in communication, and air heated in the temperature switching chamber 3 flows out of the temperature switching chamber 3 by convection. The heating efficiency is significantly deteriorated. According to the present invention, by closing the second damper 20, the sealing property of the temperature switching chamber 3 is improved and the heat retaining property is improved. Moreover, it can prevent that the heated air which flowed out flows backward into the vegetable compartment 5 etc.

  It is desirable to control the surface temperature of the heater 15 below the ignition point of the combustible refrigerant in the evaporator 17. This is to eliminate the risk of ignition when refrigerant leaks from the evaporator 17 or the like. Thereby, a safer refrigerator can be provided.

  When the refrigerator compartment 2 needs to be cooled, the evaporator 17 and the fan motor 18 are driven, the fifth damper 27 is opened, and the air blown from the fan motor 18 passes the inside of the refrigerator compartment 2 to the vegetable compartment 5. It is done. When the refrigerator compartment 2 is cooled to the set temperature, the fifth damper 27 is closed to prevent overcooling. The cooling of the chilled chamber 23 may be similarly controlled by the fourth damper 25. In addition, when the temperature switching chamber 3 is set to the high temperature side, it is desirable to control the chilled chamber 23 to be supercooled. This is to prevent temperature rise in the chilled chamber 23 and the vegetable chamber 5 due to heat leakage from the temperature switching chamber 3.

  In addition, since a damper is not provided in the ventilation path (not shown) in which the fan motor 18 and the ice making chamber 4 communicate with each other, when the evaporator 17 and the fan motor 18 are driven, the ice making chamber 4 and the freezing chamber 6 are connected. Cold air is always blown. At this time, the third damper 22 is open. Here, the amount of air blown to the ice making chamber 4 varies depending on the open / closed state of the first damper 13, the fourth damper 25, and the fifth damper 27. When the fan motor 18 is stopped and the high temperature air is returned to the evaporator 17 when the temperature switching chamber 3 is switched from the high temperature side to the low temperature side, the third damper 22 is closed. . In order to switch the temperature switching chamber 3 from the high temperature side to the low temperature side, quick temperature switching is necessary, the fan motor 14 operates, and the air is forcibly blown from the temperature switching chamber 3 to the evaporator 17. At this time, when the fan motor 18 is not driven, the air from the temperature switching chamber 3 flows backward to the freezer compartment 6, so the third damper 22 is closed to prevent the freezer compartment 6 from rising in temperature.

  If the refrigerator of this invention is equipped with the temperature switching chamber, it can be utilized irrespective of a shape or a use.

(A) It is a front view of a refrigerator. (B) It is a right view of a refrigerator. It is a permeation | transmission figure of FIG.1 (b). It is a right side see-through view near the temperature switching chamber. It is a permeation | transmission figure of the center part and lower part vicinity of the refrigerator of Fig.1 (a). It is a block diagram which shows the structure of the cold air circuit of a refrigerator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigeration room 3 Temperature switching room 6 Freezing room 11 Storage case 12 1st introduction ventilation path 15 Heater 19 1st return ventilation path 30 Metal plate 31 Space 33 Net shelf

Claims (7)

  A cooling device that generates cold air, a storage chamber, a temperature switching chamber that can switch a room temperature, an introduction ventilation path that ventilates the cold air to the temperature switching chamber, and a return ventilation that ventilates the air in the temperature switching chamber to the cooling device. A refrigerator comprising a path, a heater arranged at the bottom of the temperature switching chamber, a metal plate provided around the heater, and a control unit for controlling the heater.   The refrigerator according to claim 1, wherein the heater is provided with a bottom surface and a space of the temperature switching chamber, and the metal plate is provided on a surface opposite to the bottom surface of the temperature switching chamber of the heater. .   The refrigerator according to claim 1 or 2, wherein at least a bottom surface is provided with a metal storage case in the temperature switching chamber.   The refrigerator according to claim 3, wherein a gap between the storage case and a side surface and a bottom surface of the temperature switching chamber is 7 mm or less.   The means for detecting that the storage case is placed in the temperature switching chamber is provided, and the control unit controls the heater based on the detection result. refrigerator.   The refrigerator according to any one of claims 1 to 5, wherein a metal shelf is provided in the temperature switching chamber.   The refrigerator according to any one of claims 1 to 6, wherein the control unit is a control unit that sets the room temperature of the temperature switching chamber to 50 to 80 ° C.

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