JP2851688B2 - Refrigerator with thawing room - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerator with a thawing compartment for thawing frozen food.

2. Description of the Related Art Conventionally, an example in which a heater is used for thawing frozen food is known. An example is disclosed in Japanese Patent Publication No. 48-25414, which will be described below with reference to FIGS. 7 and 8.

Reference numeral 1 denotes a thawing box, which is an outer box 2 formed in a box shape of metal or synthetic resin or the like, and a metal such as aluminum having good thermal conductivity provided with an appropriate gap inside the outer box 2. Is composed of an inner box 3. Reference numeral 4 denotes a linear heater, which is thermally conductively contacted with the inner box 3 by aluminum foil 5 so that the bottom surface of the thawing box 1 is sparse and the top surface is dense.
Reference numeral 6 denotes a heat insulating material interposed between the outer box 2 and the aluminum foil 5.

In such a configuration, the food 7 to be thawed is placed on the bottom of the thaw box 1.
When the thawing action is started by placing the garbage, the heat is applied from the entire circumference of the inner box 3 by the heating of the heater 4, so that the thawing target food 7 is heated almost uniformly and the thawing is performed. I have.

However, in such a configuration, from the bottom of the thawing box 1,
Although heat is transmitted to the bottom of the food 7 to be thawed by heat conduction and the bottom can be thawed, the effect of radiant heat from the top and side surfaces of the thawing box 1 to the food 7 to be thawed is as follows.
Since the heat ray wavelength through the inner box 3 is in the near-infrared region of 5 μm or less, there is almost no heating, and heating is performed only by heat transfer by convection of the heated air in the thawing box 1. For this reason, uneven thawing between the central part and the surface part of the food 7 to be thawed tends to be large, and the thawing time is long. In the case of products, deterioration occurs due to the high ambient temperature, so the user must monitor and process the completion of thawing, and also to open the refrigerator door to see the degree of thawing, it is not easy to use. There was a problem.

The present invention has been made to solve the above-mentioned problem, and the degree of thawing can be visually confirmed from the outside of the refrigerator, and the thawing chamber capable of thawing in a short time with less thawing unevenness, especially between the freezing temperature and the refrigeration temperature of the refrigerator. It is intended to provide the low-temperature room having the third temperature zone.

Means for Solving the Problems In order to solve the above-mentioned problems, a refrigerator with a defrosting room according to the present invention comprises a defrosting room provided with a transparent door which can be opened and closed at a front opening portion, and a third temperature between a freezing temperature and a refrigeration temperature. A low-temperature room door is installed in a low-temperature room having a belt, and a window composed of a plurality of glasses, a heat-reflection film and a frame is installed at an opposite portion in front of the thawing room at the opening of the front of the low-temperature room. Further, a thawing dish on which a food to be thawed is installed by providing a far-infrared heater, a reflecting plate covering the upper surface and side surfaces thereof in a dome shape, and a bottom plate having a heater closely attached to the bottom surface is provided at the upper part of the thawing chamber. Configuration. A ventilation path is formed in the backside space of the reflection plate and communicates with a damper thermostat provided at the entrance of the thawing chamber for adjusting the amount of inflow of cold air, and an illumination device is provided near the transparent door in the ventilation path to provide illumination to the reflection plate. A hole that communicates between the device and the thawing chamber, a shielding plate that cuts and raises the dome between the lighting device and the far-infrared heater in a straight line, and a number of ventilation holes are formed. A thawing control device for keeping the thawing room in the same temperature zone as the low temperature room and a lighting control device for turning on and off the lighting device for a certain period of time are provided. Things.

Effect of the Invention According to the present invention, direct radiation of far-infrared rays from the top and side surfaces of the food to be thawed by the far-infrared heater and indirect radiation through the reflector plate are performed, and heat transfer heating from the bottom heater is performed. Is absorbed.
During the thawing at the same time, cool air is evenly supplied to the food to be thawed from a large number of ventilation holes formed on the upper surface of the reflector, thereby suppressing the temperature rise on the food surface. Further, after the thawing is completed, the food temperature is automatically maintained at the same temperature as the low-temperature room in which the thawing room is installed, that is, the third temperature zone between the freezing temperature and the refrigeration temperature by the temperature control action of the damper thermostat. Is to be kept cool. Further, the condition of the thawing is such that the front of the thawing room is illuminated by turning on the lighting device, and can be visually observed from the outside of the refrigerator through a window body installed at a position opposite to the front of the thawing room.

Embodiment Hereinafter, a refrigerator with a thawing room according to an embodiment of the present invention will be described with reference to FIGS.

Reference numeral 8 denotes a refrigerator body which is composed of an outer box 9, an inner box 10, and a heat insulating material 11 filled between the two boxes 9, 10. 12 and 1
Reference numeral 2 'denotes a first partition wall and a second partition wall for partitioning the refrigerator body 8 into three upper, middle, and lower chambers. A freezing compartment 13 is provided above the first partition wall 12, and a partial freezing of about -3.degree. A refrigerating room 14 'is formed below the low-temperature room 14 for maintaining the temperature zone and the second partition wall 12'. 15 is the cold room 14
It is a thawing room provided in the upper section of the inside. 16 is a compressor of a refrigeration cycle provided at the bottom rear of the freezer body 8;
Is a cooler housed on the back of the freezer 13. Reference numeral 18 denotes a blower for forcibly blowing the cool air cooled by the cooler 17 into the freezing room 13, the low-temperature room 14, the refrigerating room 14 'and the thawing room 15, and 20 denotes an inlet of the low-temperature room 14 and the thawing room 15. And a damper thermometer for adjusting the amount of cold air inflow by an electrical input.The structure of the damper thermostat 20 for the thawing chamber 15 will be described as an example.21 is an electromagnetic coil, 22 is an inner core of the electromagnetic coil 21. Plunger that moves up and down depending on the presence or absence of electromagnetic action, 23
Is a rod joined to the plunger 22, and 24 is a damper for opening and closing the cold air passage. When the electromagnetic coil 21 is energized, the rod 23 is pushed up by electromagnetic action to open the damper 24, and the energization is cut off. When the rod 23 is leaned, the rod 23 is lowered and the damper 24 is closed. Although not shown, the electromagnetic coil of the damper thermo 19 for the low temperature chamber 14 having the same configuration
1 'and the damper are 24'. 25, 26, 26 'is the blower 1
Discharge ducts for guiding the cold air from 8 to the low-temperature chamber 14, the thawing chamber 15, and the refrigeration chamber 14 '. It is a suction duct. Reference numerals 29, 30, and 31 denote temperature detectors for detecting the temperatures in the freezing room 13, the low-temperature room 14, and the thawing room 15, respectively. Further, a mechanical damper thermostat 30 'is installed at the entrance of the refrigerating compartment 14', and a temperature detector 31 'detects the room temperature and regulates the inflow of cold air so as to reach a predetermined refrigerating temperature. The cool air that has cooled the refrigerating chamber 14 'returns to the cooler 17 from the suction duct 27 together with the cool air returned from the low-temperature chamber 14.

Next, a detailed configuration of the thawing chamber 15 will be described. Reference numeral 32 denotes an outer box made of a synthetic resin, and reference numeral 33 denotes a heat insulating material provided on the inner surface of the outer box 32 and surrounding the outer periphery. Numeral 34 denotes a far-infrared heater provided in the upper part of the thawing chamber 15, and a ceramic coating layer containing silicon or the like as a main component on the surface of a glass tube 36 enclosing a heater wire 35.
37 is baked and painted to effectively emit far infrared rays of about 5 μm or more. The far-infrared heater 34 is supported by a reflecting plate 39 made of a metal such as aluminum, which is formed in a dome shape, via a holder 38 made of a high heat-resistant synthetic resin.

The reflection plate 39 is formed by integrally forming both side walls in the thawing chamber 15 and an inner box portion forming an inner wall, and furthermore, a large number of ventilation holes 39a are formed in a flat portion on both sides of the top dome portion. ing. 40 is a lighting device, a socket 40a and a lamp 4
0b, is installed in front of the outer box 32, and is located in front of the back surface of the reflection plate 39.

In the reflection plate 39, a hole 39b that is opened at least as much as the lighting device 40 communicating with the lighting device 40 and the inside of the thawing chamber 15 is provided.
And a shielding plate 39 provided by cutting and raising a dome portion between the lighting device 40 and the far-infrared heater 34 in a straight line.
forming c. Next, reference numeral 41 denotes a bottom plate made of metal such as aluminum.
It is closely fixed thermally conductive by 43 or the like. Reference numeral 44 denotes a thawing plate which is detachably mounted on the bottom plate 41, and comprises a metal plate 46 such as aluminum on which a food 45 to be thawed is placed and a frame 47 surrounding the outer periphery. Reference numeral 48 denotes a protective net for preventing burns, which is fixedly installed at a predetermined interval below the reflection plate 39. Reference numeral 49 denotes a door made of transparent plastic or the like which opens and closes a front opening of the thawing chamber 15. Reference numeral 50 denotes a ventilation path formed in a space on the back surface of the reflection plate 39, and communicates with the damper thermo 20 via a discharge port 51. Reference numeral 52 denotes a suction port formed in the inner wall of the thawing chamber 15 and the suction duct 28.
Is in communication with Reference numerals 53 and 53 'denote a defrosting switch and a lighting switch provided on the outer front surface of the refrigerator body 8, respectively. At the front opening of the low-temperature chamber 14, a window body 57 is provided at an opposed part in front of the thawing chamber 15, which is constituted by an outer plate 54, an inner plate 55, and a heat insulating material 56 filled between the two plates. Low temperature room door 58 is located. The window body 57 is composed of a plurality of substantially transparent glasses 58 ', a heat reflection film 59, and a frame body 60,
An air layer 61 is formed by the glass 58 'and the heat reflection film 59, and the heat insulation film is secured by the air layer 61, and at the same time, the heat reflection film 59 prevents heat rays from entering the low-temperature chamber 14. .

Next, an electric circuit and a control circuit will be described. Compressor
16 is connected to a power supply via a relay contact 62, and the blower 18 is connected to a power supply via a relay contact 63. In addition, the electromagnetic coil 21 of the thawing room damper thermometer and the electromagnetic coil 21 'of the low temperature room damper thermometer are connected to a power source via relay contacts 64 and 65, respectively. Further, the far infrared heater 34 and the heater 42 in the thawing chamber 15 are both connected to a power source via a relay contact 65 '.

66 is a freezing room temperature control device, a comparison circuit including a temperature detector 29 such as a thermistor, resistors R ₁ , R ₂ , R ₃ , and a comparator 67;
A transistor 68 and a relay coil 69 are provided, and the output of the comparator 67 is connected to the base of the transistor 68. Further, the collector of the transistor 68 has the relay coil for suction for opening and closing the relay contact 62.
69 is connected. Reference numeral 70 denotes a low-temperature room temperature control device, which includes a temperature detector 30 such as a thermistor, resistors R ₄ , R ₅ , R ₆ , and a comparator 7.
The comparator 71 includes a comparison circuit, a transistor 72, and a relay coil 73. The output of the comparator 71 is connected to the base of the transistor 72. Also transistors
The collector coil 72 is connected to the attraction relay coil 73 for opening and closing the relay contact 65. 74 is a thawing room temperature control device, a temperature detector 31 such as a thermistor, a resistor R ₇ ,
R ₈ , R ₉ , a comparison circuit with a comparator 75, a transistor 76, a relay coil 77, usually the thawing chamber 1
The resistance of the comparator 75 is connected to the base of the transistor 76. The resistor is configured so that the room temperature of 5 is controlled to a partial freezing temperature of about −3 ° C. The collector of the transistor 76 has the relay contact
The relay coil 77 for suction that opens and closes 64 is connected. Further, reference numeral 78 denotes a defrost control device,
53, a timer 79, an OR circuit 80, transistors 81 and 83, and relay coils 82 and 84.An output of the defrost switch 53 is connected to an input of the timer 79, and the timer
The output of 79 is the base of the transistor 81 and the OR circuit.
Connected to one input of 80.

The collector of the transistor 81 has a relay contact.
The relay coil 82 for suction for opening and closing 65 'is connected. On the other hand, the other input of the OR circuit 80 is connected to the output of the comparator 67 of the freezer compartment temperature control device 66, and the output of the OR circuit 80 is connected to the base of the transistor 83. The collector of the transistor 83 is connected to a relay coil 84 for attraction for opening and closing the relay contact 63. Here, the timer 79
Once the signal of "HIGH" (hereinafter simply referred to as "H") is input to the input, it keeps outputting the "H" signal for a predetermined time,
It is configured to switch to a signal of “LOW” (hereinafter simply referred to as “L”). Reference numeral 85 denotes a lighting control device, which is connected in series with the lighting switch 53 'and the lighting device 40a. When the lighting switch 53' is turned on, a certain time (for example, 30 seconds)
After the lighting device 40a is energized, it is turned off.

In such a configuration, when the temperature of the freezing compartment 13 is higher than a predetermined value, the resistance value of the temperature detector 29 becomes small and the output of the comparator 67 becomes "H", so that the transistor 68
Turns ON and the relay coil 69 conducts.

Therefore, the relay contact 62 is closed and the compressor 16 is operated. At the same time, the output of the OR circuit 80 is also "H", so that the transistor 83 is turned on and the relay coil 84 is turned on. For this reason, the relay contact 63 is closed, the blower 18 is also operated, and the cool air is forcibly ventilated to the freezing room 13, the low-temperature room 14, the refrigerating room 14 'and the thawing room 15 to perform cooling. Thereafter, when the freezing compartment 13 is cooled to a predetermined temperature, the resistance value of the temperature detector 29 increases, and the output of the comparator 67 becomes “L”. As a result, the transistor 68 is turned off, and the output of the OR circuit 80 also becomes "L", so that the transistor 83 is also turned off and the power supply to the relay coils 69 and 84 is cut off. Therefore, the relay contacts 62,
63 is opened and the compressor 16 and the blower 18 are stopped. Thereafter, this operation is repeated, and the inside of the freezing compartment 13 is maintained at a predetermined temperature (for example, −20 ° C.).

Next, when the temperature of the low-temperature chamber 14 is higher than a predetermined value, the resistance value of the temperature detector 30 becomes small, and the output of the comparator 71 becomes “H”, so that the transistor 72 is turned on and the relay coil 73 is turned on. I do. Therefore, the relay contact 65 is closed, the electromagnetic coil 21 'is energized, the damper 24' of the damper thermo 19 is opened, and cool air is introduced into the low temperature chamber 14 to perform a cooling action. Thereafter, when the low temperature chamber 14 is cooled to a predetermined temperature, the resistance value of the temperature detector 30 increases, and the output of the comparator 71 becomes “L”. Because of this, the transistor
The switch 72 is turned off, the power supply to the relay coil 73 is cut off, the relay contact 65 is opened, and the power supply to the electromagnetic coil 21 'is also cut off.
Then, the damper 24 ′ of the damper thermo 19 is closed, and the inflow of cool air into the low temperature chamber 14 is prevented. Thereafter, by repeating this operation, the temperature inside the low-temperature chamber 14 is maintained at a third temperature zone between the freezing temperature and the refrigeration temperature, that is, a partial freezing temperature zone of about -3 ° C.

When the temperature of the thawing chamber 15 is higher than a predetermined value at the time of non-thawing, the resistance of the temperature detector 31 is small, and the output of the comparator 75 becomes “H”. The coil 77 conducts. For this reason,
The relay contact 64 is closed, the electromagnetic coil 21 is energized, the damper 24 of the damper thermo 20 is opened, and cool air is introduced into the thawing chamber 15 to perform a cooling action. Thereafter, when the inside of the thawing chamber 15 is cooled to a predetermined temperature, the resistance value of the temperature detector 30 increases, and the output of the comparator 75 becomes “L”. For this reason, the transistor 76 is turned off, the power supply to the relay coil 77 is cut off, the relay contact 64 is opened, and the power supply to the electromagnetic coil 21 is also cut off. And damper thermo 20 damper
24 is closed to prevent cold air from flowing into the thawing chamber 15. Thereafter, by repeating this operation, the temperature inside the thawing chamber 15 is maintained at the same partial freezing temperature zone of about −3 ° C. as the low-temperature chamber 14.

Next, the operation at the time of thawing will be described. First, the food 45 to be thawed is placed on the thawing dish 44, placed on the bottom plate 41 in the thawing chamber 15, and the thawing switch 53 is turned on. Simultaneously with turning on, the timer 79 starts outputting the "H" signal, the transistor 81 is turned on, the relay coil 82 is turned on, and the relay contact 65 'is closed. Then, energization of the far-infrared heater 34 and the heater 42 on the bottom surface is started, and radiation from the far-infrared heater 34 is reflected from the top surface of the food 45 to be thawed by the reflecting plate 39.
The heat conduction and heating by the heater 42 are simultaneously performed from the bottom surface. here,
In the heating of the far-infrared heater 34, far-infrared rays having a long wavelength of 5 μm or more are radiated to the food 45 to be thawed.
In general foods that have an absorption range in the far-infrared wavelength range, far-infrared rays are efficiently absorbed and penetrate relatively deep into the food 45 to be thawed, and the temperature unevenness between the surface and the center does not increase. Thawing proceeds. In the heating by the heater 42, the bottom surface of the food 45 to be thawed, which cannot be sufficiently heated by the far-infrared heater 34, can be thawed by heat conduction heating through the thawing dish 44.

On the other hand, the transistor 83 is turned on because the output of the OR circuit 80 also becomes "H" during thawing at the same time as the heating action by the far infrared heater 34 and the heater 42, that is, while the output of the timer 79 continues to generate "H". Then, the relay coil 84 conducts, and the relay contact 63 is closed. Therefore, regardless of the output of the freezing room temperature control device 66, the blower 18 is forcibly operated. Here, during thawing, the temperature in the thawing chamber 15 gradually increases due to the heating action of the far-infrared heater 34 and the heater 42, so that the temperature detected by the temperature detector 31 provided in the thawing chamber 15 also increases. The output of the comparator 75 of the thawing room temperature controller 74 becomes “H”.

As a result, the transistor 76 is turned on to energize the relay coil 77, the relay contact 64 is closed, and the electromagnetic coil 21 of the damper thermo 20 is energized. Then, the damper 24 is opened, and the cool air forcedly blown by the blower 18 flows from the discharge port 51 into the ventilation path 50 in the upper part of the thawing chamber 15 through the discharge duct 26.
The cool air that has flowed into the ventilation passage 50 has a large number of ventilation holes 39a formed in the reflection plate 39 and holes 39b that are opened at least as much as the lighting device 40.
It is discharged further downward and cools the surface of the food 45 to be thawed evenly. By this action, the food 45 to be thawed mainly progresses in a form relatively close to internal heating due to the far-infrared radiation effect of the far-infrared heater 34, and the temperature rise on the surface is suppressed. Thawing with a small temperature difference can be realized. In addition, the thawing time is shorter than conventional heaters due to the internal penetration effect of far infrared rays.
Reflector 39, which is exposed to the inside of 50 and will be at a considerable high temperature
The temperature of itself and the peripheral members such as the lighting device 40 is cooled and lowered, which is convenient for safety. In addition, since the dome portion between the illumination device 40 and the far-infrared heater 34 is cut and raised linearly and the shielding plate 39c is provided, there is no thermal deformation of the illumination device 40. After cooling, the cool air flowing into the thawing chamber 15 is cooled by a cooler 17 through a suction duct 28 through a suction port 52 opened on the back side.
Will be collected.

When the thawing operation proceeds and the timer 79 counts a predetermined time, the output of the timer 79 becomes "L", the transistor 81 is turned off, and the power supply to the relay coil 82 is cut off. Then, the relay contact 85 opens and the far-infrared heater 34,
The energization of the heater 42 is cut off, and the thawing operation ends.
At the same time, one input of the OR circuit 80 becomes “L”, so that the forced air blowing state of the blower 18 is released. After the thawing is completed, the temperature inside the thawing chamber 15 is controlled based on the temperature detected by the temperature detector 31 as in the case of the normal cooling. Therefore, the food 45 to be thawed after thawing is immediately cooled so as to be stabilized in the partial freezing temperature zone of about −3 ° C., and the temperature does not further rise due to residual heat. Then, even if the thawing is completed, the chill is kept in a partial freezing temperature range of about -3 ° C. which is suitable for preserving raw materials such as fish and meat. Thawing can be carried out with peace of mind immediately after processing, and the food 45 to be thawed can be used at any time after the thawing is completed, which is extremely convenient. Further, the thawing chamber 15 is installed in the low-temperature chamber 14, and both rooms are normally maintained at a partial freezing temperature zone of about -3 ° C.
The temperature control inside is accurate without being affected by heat from the low-temperature room 14. Furthermore, in the thawing room 15, the lighting device is turned on for a certain time by turning on the lighting switch 53 '.
It can be seen from the outside through the 60 window 57. In addition, the lighting device 40 has a hole 39b which is provided at the front of the outer box 32 and is opened at least equal to the lighting device 40. The thawing status of 45 can be clearly seen.

Effects of the Invention As described above, according to the refrigerator with a thawing room of the present invention, the following effects can be obtained.

(1) Efficient heating from both sides: far-infrared radiation heating with a return infrared heater from the top surface and heat conduction heating with a heater from the bottom surface. Thawing can be performed in a short time without unevenness in temperature.

(2) During thawing, the blower for forced ventilation is continuously operated, and the cool air descends and flows into the food to be thawed from the ventilation path formed in the back space of the reflector, so that the surface of the food to be thawed is uniformly cooled. Further, the temperature rise is suppressed, and thawing with less thawing unevenness can be realized.

(3) During thawing, the temperature of the reflector and other peripheral members such as the reflector and the illuminating device, which are normally high, are exposed to the ventilation passage and cooled, so that the temperature is lowered and the safety is favorable. In addition, since the dome portion between the illumination device and the far-infrared heater is cut and raised linearly to provide a shielding plate, there is no thermal deformation of the illumination device.

(4) After the thawing is completed, the thawing room is kept cool in a third temperature zone (for example, a partial freezing temperature zone of about −3 ° C.) between the freezing room temperature and the refrigerating room temperature. The temperature of the thawed food does not rise further,
Even if left as it is, freshness is maintained at a temperature suitable for raw fish and the like, and the food can be used at any time.

(5) The thawing room is installed in a low-temperature room, and since both rooms are normally maintained in a partial freezing temperature zone of about -3 ° C, the thawing room is not affected by heat from the low-temperature room. Temperature control of partial freezing temperature can be performed accurately.

(6) The lighting device is installed in front of the thawing room and there is a window body in front of the thawing room.
It can be visually checked from the outside without opening the cold room door. In addition, the lighting device is provided near the transparent door in front of the thawing room, and the reflection plate is provided with a hole that is opened at least equal to the lighting device communicating between the lighting device and the thawing room. The thawing status of the food to be thawed and stored in the thawing room can be clearly seen. The lighting device is turned off after turning on for a certain period of time, so that forgetting to turn off the lighting device can also prevent the effect on thawing.The window body has an air layer, and the heat reflection film prevents heat rays from entering, so it is insulated. The nature is also sufficiently secured.

[Brief description of the drawings]

1 is a perspective view of a thawing room of a refrigerator showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA 'of FIG. 1, and FIG. 3 is a thawing room of FIG. FIG. 4 is an enlarged sectional view of a damper thermostat provided at the entrance of the thawing chamber of FIG. 1, and FIG. 5 is a longitudinal sectional view of a window part of FIG. FIG. 6, FIG. 6 is an electric circuit and control circuit diagram of the refrigerator with a defrosting chamber of FIG. 3, FIG. 7 is a perspective view of a defrosting box showing a conventional example, and FIG. It is sectional drawing in the B 'line. 13 …… Freezer room, 14 …… Low temperature room, 14 ′ …… Refrigerator room, 16 ……
Compressor, 17: Cooler, 18: Blower, 20: Damper thermo, 34: Far infrared heater, 39: Reflector, 39a ...
... ventilation holes, 40 ... lighting equipment, 39b ... holes, 39c ... shielding plate, 41 ... bottom plate, 42 ... heater, 44 ... thawing tray,
45: Food to be thawed, 49: Door, 50: Ventilation path, 57: Window body, 58: Low temperature room door, 58 ': Glass, 59: Heat reflection film, 60: Frame, 78: Defrosting control device, 85: Lighting control device.

Continuation of the front page (51) Int.Cl. ⁶ identification symbol FI H01H 43/04 H01H 43/04 A (58) Field surveyed (Int.Cl. ⁶ , DB name) F25D 23/12 F25D 17/08 F25D 17 / 06 F25D 11/02 H01H 43/04

Claims (1)

(57) [Claims] 1. A freezing room, a refrigerating room, a low-temperature room having a third temperature zone between the room temperatures of the two rooms, and a low-temperature room installed in the low-temperature room. A thawing chamber provided with a transparent door which can be opened and closed, a low temperature chamber door provided with a window formed of a plurality of glasses, a heat reflection film and a frame at opposing positions in front of the thawing chamber, and compression of a refrigeration cycle. Machine,
A cooler, a blower for forcibly ventilating the air cooled by the cooler through the freezing room, the refrigerating room, the low-temperature room and the thawing room, a far-infrared heater provided above the thawing room, and a metal bottom plate. A heater that is thermally conductively attached to the back surface,
A metal reflecting plate that covers the top and side surfaces of the far-infrared heater in a dome shape, a thawing dish that is placed on the bottom plate in a thermally conductive and detachable manner on which the food to be thawed is placed, and the thawing chamber A damper thermometer which is provided at an entrance for adjusting the inflow of cold air, communicates with the damper thermometer, a ventilation path formed in an upper space on the back surface of the reflector, and an illumination provided near the transparent door in the ventilation path. A device, a hole provided in the reflector for communicating the lighting device with the defrosting chamber, and a shield provided by cutting and raising a dome portion of the reflector between the lighting device and the far-infrared heater in a straight line. A plate, a number of ventilation holes provided in the reflection plate for communicating between the ventilation path and the defrosting chamber, and performing continuous operation control of the blower during defrosting, and during defrosting, the defrosting chamber is the same as the low-temperature chamber. Thaw to keep in the temperature range of And control device, after lighting the lighting device a predetermined time, more composed fridge decompression chamber and the illumination controller for turning off.