TWI720223B - refrigerator - Google Patents

Abstract

The refrigerator includes: a heat-insulating box with a storage space divided into a plurality of storage rooms by partitioning materials; a low-temperature greenhouse, which is set as one of the storage rooms, and keeps the cooled objects in a non-freezing state In the temperature below the freezing point; the cooling device cools the storage space; the control device controls the cooling device to repeat the execution so that the temperature in the low-temperature chamber is higher than the freezing point of the object to be cooled in the preset time The first program in which the second temperature is lowered to the first temperature lower than the freezing point, and the second program in which the second temperature is increased from the first temperature to the second temperature, and the second temperature is maintained for a preset time. The control device executes control so that the temperature in the low-temperature chamber is lower than the freezing point in the state of the freezing point and the time integral value of the difference between the temperature in the low-temperature chamber, and the temperature in the low-temperature chamber is higher than the freezing point The time integral value of the difference between the freezing point and the temperature in the low-temperature chamber in the state of the point is balanced.

Description

Refrigerator

The present invention relates to a refrigerator having the function of supercooling an object to be cooled.

Generally speaking, in a refrigerator, when the food is preserved while maintaining the quality, it is desirable to maintain the temperature as low as possible without freezing. A method of preserving food in a supercooled state has been proposed as a way to realize this preservation. In addition, the so-called supercooled state is a non-freezing state in which the food does not start to freeze even if the food reaches below the freezing point. However, when the food is stored below the freezing point (for example, below 0°C), the supercooled state may be released due to impact or some reasons, and ice crystals may be generated in the food. Then, it is left in the state where the supercooling state is released, and the freezing of the food continues, because the freezing causes cell damage and reduces the quality of the food.

In order to avoid this problem, the following method is proposed in which the temperature is periodically changed, and the generated ice crystals are melted by releasing the supercooled state. For example, Patent Document 1 discloses a refrigerator in which after a supercooling operation in which food is in a supercooled state, the operation and stopping of the cooling device are repeated one or more times based on the temperature setting of the refrigeration operation, and then the supercooling operation is started again. In the refrigerator of Patent Document 1, even when the freezing of food starts due to the supercooling operation, by performing the refrigerating operation at a higher set temperature than the set temperature of the supercooling operation, it is possible to prevent the food from freezing completely.

In addition, Patent Document 2 discloses a refrigerator that repeatedly executes a low-temperature program in which the set temperature in the refrigerator is set to a temperature lower than the freezing point of food, and a temperature-raising program that is set to a temperature higher than the freezing point. In the refrigerator of Patent Document 2, the supercooling state of the food is released during the low temperature process, and when ice crystals are generated in the food and freezing begins, by starting the temperature rising process at a predetermined time point, the overcooling can be released. The ice crystals that had been produced melted. In addition, the low-temperature program is implemented again later, thereby realizing the supercooled state, and the supercooled state of the food can be stably maintained.

However, it is desirable to have a structure like the refrigerator disclosed in Patent Document 3, in which frequently used vegetable compartments are arranged in the lower area of the refrigerating compartment arranged in the upper area of the refrigerator, so that the user can take out vegetables while standing. If the refrigerator is provided with the vegetable compartment in the lower area of the refrigerator body, the user has to bend down every time he wants to take out the vegetables, the burden is heavy when taking out the heavy vegetables, and the ease of use becomes poor. That is, in the refrigerator of Patent Document 3, when the function of making the object to be cooled in the supercooled state disclosed in Patent Documents 1 and 2 is added below the refrigerating compartment, the supercooling control area and the vegetable compartment are adjacent to each other.

Advanced technical literature Patent literature:

Patent Document 1: Japanese Patent No. 4647047

Patent Document 2: Japanese Patent No. 4498562

Patent Document 3: Japanese Patent Laid-Open No. 2000-186883

Here, in the refrigerator of Patent Document 1, the time for performing the refrigerating operation is the time during which the cycle in the normal refrigerating operation is repeated more than once, and the relationship between the time for performing the supercooling operation and the amount of heat during each operation is not considered. Therefore, for example, if the time to implement the refrigerating operation is too short relative to the time to implement the supercooling operation, the ice crystals of the food cannot be sufficiently melted, so that the freezing of the food continues. In addition, when the refrigerating operation is performed for a long time relative to the time for performing the supercooling operation, the average temperature during the storage period of the food becomes higher, which may cause the quality of the food to deteriorate.

In addition, in the refrigerator of Patent Document 2, the time of the low-temperature program is set for the purpose of completely melting the ice crystals generated in the low-temperature program. In detail, in the refrigerator of Patent Document 2, the time of the low-temperature program is set so that the latent heat Q1 released when the water becomes ice, the latent heat Q2 taken from the water during the freezing process, and the heat Q3 given to the ice during the thawing process are satisfied The relationship of Q3≧Q1+Q2. In this way, the ice crystals generated in the low-temperature program can be completely melted, but the time of the temperature-raising program becomes longer. As a result, the average temperature during the storage period of the food is higher than the freezing temperature, which may result in quality degradation.

In addition, in the refrigerator of Patent Document 3, in the case where a function of supercooling the object to be cooled is added to the lower part of the refrigerating compartment, since the supercooling control area is adjacent to the vegetable compartment, the vegetable compartment may be overcooled. Therefore, this refrigerator must use an appropriate heat insulation material between the supercooling control area and the vegetable compartment to form a heat insulation structure, which causes the problem of enhanced structural restriction.

The present invention is to solve the above-mentioned problems, and its object is to provide a refrigerator that can maintain the object to be cooled in a state equivalent to the supercooled state, lower the average temperature of the object during the storage period, and prevent the object to be cooled. The cooling material causes adverse effects, and the cooling material can be prevented from freezing completely.

The refrigerator of the present invention includes: a heat-insulating box body with a storage space partitioned into a plurality of storage rooms by partitioning members; a low-temperature room is provided as one of the above-mentioned storage rooms to keep the cooled object Stored in a frozen state at a temperature below the freezing point; a cooling device to cool the storage space; a partition arranged in parallel with the partition structure between the low-temperature chamber and the storage room located below the low-temperature chamber Plate; heating device is provided in the area enclosed by the partition and the partition member; the control device controls the cooling device to repeatedly execute the temperature in the low-temperature chamber in the preset time, from higher than The first program of reducing the second temperature of the freezing point of the object to be cooled to the first temperature lower than the freezing point, and increasing it from the first temperature to the second temperature, and making the first temperature 2 The second program of maintaining the temperature for a preset time; the area enclosed by the partition and the partition member is divided into a plurality of spaces by the partition or the rib protruding from the partition member. One of the partitioned spaces is provided with the heating device; the control device, in the second program, controls the cooling device and controls the heating device so that the internal temperature of the low temperature room rises from the first temperature Up to the second temperature, control is performed so that the temperature in the low-temperature chamber is lower than the freezing point in a state where the time integral value of the difference between the freezing point and the temperature in the low-temperature chamber, and the low-temperature chamber The time integral value of the difference between the freezing point and the temperature in the low-temperature chamber in a state where the temperature in the storage is higher than the freezing point is balanced.

According to the refrigerator of the present invention, since the control is performed so that the temperature in the low-temperature chamber is lower than the freezing point, the time integral value of the difference between the freezing point and the temperature in the low-temperature chamber, and the temperature in the low-temperature chamber The time integral value of the difference between the freezing point in the state higher than the freezing point and the temperature in the low-temperature room is balanced, so it is possible to achieve the recognition of the freezing time of the object to be cooled in the first program and the second program, and The balance of calories. Therefore, the refrigerator of the present invention can maintain the object to be cooled in a state equivalent to the supercooled state and reduce the average temperature during the storage period of the object to be cooled, without adversely affecting the object to be cooled, and can prevent the object from being cooled. The cooling material is completely frozen.

1‧‧‧Refrigerator

2‧‧‧Compressor

3‧‧‧Cooler

4‧‧‧Blowing fan

5, 5a, 5b‧‧‧Wind Road

6‧‧‧Operation Panel

7‧‧‧Control device

8‧‧‧Door piece

10‧‧‧Door bag holder

11‧‧‧Shelf

12‧‧‧Cooling room

13‧‧‧Low-temperature greenhouse (supercooling control area)

14, 15‧‧‧Temperature sensor

16,17‧‧‧Airlock

18‧‧‧Heater

19‧‧‧Cooling device

20‧‧‧ Rib area

30‧‧‧Still air area

40‧‧‧Partition

50‧‧‧Division material

61‧‧‧Operation Department

62‧‧‧Display

71‧‧‧Timing Department

72‧‧‧Counter

73‧‧‧Program Migration Department

74‧‧‧Temperature setting section

75‧‧‧Comparison Department

76‧‧‧Control Department

77‧‧‧Memory Department

80、81‧‧‧Door piece

90‧‧‧Insulation box

100‧‧‧Refrigerator

200‧‧‧Vegetable Room

300‧‧‧Freezer

201, 301‧‧‧Storage box

Fig. 1 is a front view schematically showing the appearance of the refrigerator according to the embodiment of the present invention.

Fig. 2 is an internal configuration diagram schematically showing the internal configuration of the refrigerator according to the embodiment of the present invention.

Fig. 3 is an internal configuration diagram schematically showing the internal configuration of the refrigerating compartment of the refrigerator according to the embodiment of the present invention.

Fig. 4 is a block diagram showing the control structure of the refrigerator according to the embodiment of the present invention.

[Fig. 5] is a functional block diagram related to temperature control of the low temperature chamber of the refrigerator control device according to the embodiment of the present invention.

Fig. 6 is a graph showing changes with time in the set temperature of the low temperature chamber and the temperature in the compartment when the temperature control of the refrigerator according to the embodiment of the present invention is implemented.

[Fig. 7] is a flowchart showing the temperature control process of the low temperature chamber in the refrigerator according to the embodiment of the present invention.

[Figure 8] shows the temperature control in the refrigerator according to the embodiment of the present invention, the set temperature of the low temperature room and the time-dependent changes in the temperature in the compartment, the heat released by the cooling object q1, and the supply to the cooling object Graph of calories q2.

[Figure 9] It shows the freezing time (freezing time) of the object to be cooled when the low temperature setting temperature θL is -3°C, and the breaking peak when the object to be cooled is cut off. Diagram of the relationship of the numbers.

[Fig. 10] is a diagram showing the changes over time in the setting temperature, the temperature in the storage room, and the temperature of the food in the low temperature room when the temperature control in the refrigerator is implemented in the embodiment of the present invention, showing that the object to be cooled has not been released from overcooling A chart of an example of the situation.

[Fig. 11] is a diagram showing the changes over time in the set temperature, internal temperature, and food temperature of the low temperature chamber when the temperature control in the refrigerator is implemented according to the embodiment of the present invention, showing that the object to be cooled has been released from cooling A chart of an example of the situation.

[Fig. 12] is a graph showing the time-dependent changes of the set temperature, the temperature in the storage room, and the food temperature in the low-temperature chamber when the temperature control is implemented in the comparative example. It shows that the heating program time is set such that the heat quantity q1>the heat quantity q2 A diagram of an example of the situation.

[Fig. 13] is a graph showing the time-dependent changes of the set temperature, the temperature in the storage room, and the food temperature in the low-temperature chamber when the temperature control is implemented in the comparative example. It shows that the time of the temperature program is set such that the heat quantity q1<the heat quantity q2 A diagram of an example of the situation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same or corresponding parts in each figure are denoted by the same symbols, and their descriptions are omitted or abbreviated as appropriate. In addition, the structure described in each figure, its shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention. In addition, the positional relationship (e.g., up-down relationship, etc.) of the constituent members in the specification is, in principle, the positional relationship when the refrigerator 1 is placed in a usable state.

Implementation form.

Fig. 1 is a front view schematically showing the appearance of a refrigerator according to an embodiment of the present invention. Fig. 2 is an internal configuration diagram schematically showing the internal configuration of the refrigerator according to the embodiment of the present invention. Fig. 3 is an internal configuration diagram schematically showing the internal configuration of the refrigerating compartment of the refrigerator according to the embodiment of the present invention. Fig. 4 is a block diagram showing the control structure of the refrigerator according to the embodiment of the present invention. In addition, in the following drawings including FIGS. 1 to 4, the dimensional relationship and shape of each constituent member may be different from the actual article. In addition, the positional relationship (for example, the up-and-down relationship, etc.) between the constituent members in the specification is, in principle, the positional relationship when the refrigerator 1 is placed in a usable state.

(Composition of refrigerator 1)

As shown in FIGS. 1 and 2, the refrigerator 1 is equipped with the heat insulation box 90 which opened the front surface (front), and formed the storage space inside. Although the detailed illustration of the heat insulation box 90 is omitted, it is composed of an outer box made of steel, an inner box made of resin, and a heat insulating material filling the space between the outer box and the inner box. However, there is no heat insulating material between the refrigerator compartment 100 and the vegetable compartment 200. The storage space formed inside the heat insulation box 90 is partitioned by a plurality of partition members 50 into a plurality of storage rooms for storing objects to be cooled such as food. As shown in FIGS. 1 and 2, the refrigerator 1 of this embodiment is equipped with the following as a plurality of storage compartments: the refrigerating compartment 100 arranged at the uppermost stage, the vegetable compartment 200 arranged below the refrigerating compartment 100, and the freezing compartment 300 arranged at the lowermost stage. In addition, in the structure in which the vegetable compartment 200 is provided in the lower region of the refrigerating compartment 100, the type and number of storage compartments provided in the refrigerator 1 are not limited to this.

In the opening formed in the front face of the refrigerating compartment 100, a rotary door panel 8 that opens and closes the opening is provided. The door piece 8 of the refrigerator 1 of this embodiment is a single opening. In addition, as shown in FIG. 3, an operation panel 6 is built in the refrigerating compartment 100. As shown in FIG. 4, the operation panel 6 is equipped with the operation part 61 for adjusting the set temperature etc. of each store room, and the display part 62 which displays the temperature of each store room and the presence information etc. in the store room. The operation unit 61 is constituted by, for example, an operation switch. The display unit 62 is composed of, for example, a liquid crystal display. In addition, the operation panel 6 may also be composed of a touch panel in which the operation section 61 is integrally formed on the display section 62.

As shown in Fig. 2, the vegetable compartment 200 and the freezing compartment 300 are opened and closed by drawer-type doors 80 and 81, respectively. These drawer-type door panels 80 and 81 are slidable in the depth direction (front-rear direction) of the refrigerator 1 by making the frame fixed to the door panel slide relative to the rails horizontally formed on the left and right inner wall surfaces of the respective storage compartments. )Opening and closing. The storage box 201 in which the object to be cooled can be stored is placed in the vegetable compartment 200 so as to be able to be pulled out freely. The storage box 201 is supported by the frame of the door, and slides in the front-rear direction in conjunction with the opening and closing of the door. Similarly, the storage box 301 in which foods and the like are stored is placed in the freezer compartment 300 so as to be able to be pulled out freely. The number of storage boxes 201 and 301 installed in each storage room is one each, but in consideration of the capacity of the entire refrigerator 1 and the improvement of storage properties and ease of arrangement, the number may be two or more.

A compressor 2, a cooler 3 (evaporator), a blower 4, and an air duct 5 are provided on the back side of the refrigerator 1 as a cooling device 19 for supplying cold air into each storage compartment. The compressor 2 and the cooler 3 constitute a refrigeration cycle together with a condenser (not shown) and an expansion device (not shown), and generate cold air to be supplied to each storage chamber. The cold air generated by the compressor 2 and the cooler 3 is blown by the blower 4 to the air passage 5, and supplied from the air passage 5 to the freezing compartment 300 and the refrigerating compartment 100 through an air lock. The refrigerated cold air from the refrigerator compartment 100 is supplied to the vegetable compartment 200 through a return air passage (not shown) for the refrigerator compartment to cool it. The cold air supplied to the vegetable compartment 200 returns to the cooler 3 through a return air path (not shown) for the vegetable compartment.

As shown in FIG. 3, the refrigerator compartment 100 is equipped with the door pocket rack 10 provided in the inside of the door panel 8, and the shelf 11 which partitions the space in the refrigerator compartment 100 into a plurality of stages. In addition, the number of door pocket racks 10 and shelf shelves 11 is not limited to the number shown in FIG. 3, and any number of door pocket shelves 10 and shelf 11 may be provided. In addition, the lower part of the refrigerating compartment 100 is composed of two upper and lower stages. The upper stage forms a cooling chamber 12 whose internal temperature is maintained at 0°C or higher, and the lower stage is formed to store the object to be cooled below the freezing point without freezing. The temperature of the sub-cooling control zone is the low-temperature chamber 13.

As shown in FIG. 3, the air passage 5 on the back side of the refrigerating compartment 100 is divided into an air passage 5a for sending cold air to the refrigerating compartment 100 and the cooling compartment 12 and an air passage 5b for sending cold air to the low temperature room 13. An air lock 16 is provided in the air passage 5a, and an air lock 17 is provided in the air passage 5b. The air lock 16 and the air lock 17 are used to adjust the air volume of the cold air supplied to the refrigerator compartment 100 and the low temperature chamber 13. In addition, a temperature sensor 14 for detecting the temperature in the refrigerating chamber 100 is provided on the back of the refrigerating chamber 100, and a temperature sensor 15 for detecting the temperature in the low temperature chamber 13 is provided on the back of the low temperature chamber 13. The temperature sensor 14 and the temperature sensor 15 are composed of, for example, a thermistor.

A heater 18 is arranged in front of the lower area of the low temperature chamber 13 as a heating device for performing supercooling control or increasing the temperature in the vegetable compartment 200. Specifically, in the refrigerator 1, a partition plate 40 parallel to the partition member 50 is provided between the low temperature room 13 and the vegetable room 200 located below the low temperature room 13. The heater 18 is provided in the area enclosed by the partition plate 40 and the partition member 50. In order to increase the heating density of the heater 18, the area enclosed by the partition 40 and the partition member 50 is a rib area 20 formed by the partition 40 or one or more ribs protruding from the partition member 50 The partitioned heater area is configured with the heater 18 and the still air area 30 is constituted. In addition, the space partitioned by the rib region 20 is not limited to two as shown in the figure, and may be three or more.

A control device 7 that controls the operation of the refrigerator 1 is provided in the upper part of the refrigerating compartment 100. The control device 7 is composed of a computing device such as a microcomputer or a CPU, and software executed therein. In addition, the control device 7 may be constituted by a hardware such as a circuit element that realizes its function.

As shown in FIG. 4, the detection signals obtained by the temperature sensors including the temperature sensors 14 and 15 that detect the temperature of each storage room, and the operation signal from the operation part 61 of the operation panel 6 are input to the control device 7. The control device 7, based on the input signals, controls the cooling device 19 and the heater 18 in accordance with the previously memorized operation program to control the refrigerator compartment 100, the cooling compartment 12, the low temperature room 13, the freezer compartment 300 and the vegetable compartment 200. Respectively maintain at the set temperature. For example, the cooling device 19 includes a compressor 2, a blower fan 4, and air locks including air locks 16 and 17 arranged in each storage room. The control device 7 controls the output of the compressor 2, the blowing volume of the blower fan 4, and the opening degree of the air brake. In addition, the control device 7 outputs display signals regarding the temperature of each storage room and the storage information in the storage room to the display unit 62 of the operation panel 6 based on the input signals.

(Temperature control of low temperature room 13)

Next, the temperature control of the low temperature chamber 13 in this embodiment will be described. Fig. 5 is a functional block diagram related to the temperature control of the low temperature chamber of the refrigerator control device according to the embodiment of the present invention. As shown in FIG. 5, the control device 7 has a timer unit 71 that measures time, a counter 72 that counts to obtain a count value, a program transition unit 73, a temperature setting unit 74, a comparison unit 75, a control unit 76, and a storage unit 77. The above-mentioned parts can be implemented as functional parts implemented by software, implemented by the CPU constituting the control device 7 executing programs, or implemented by electronic circuits such as DSP, ASIC (Application Specific IC), and PLD (Programmable Logic Device).

The program transition unit 73 performs program transition based on the time measured by the timer unit 71 and the count value obtained by the counter 72. The temperature setting unit 74 sets the set temperature θs of the low temperature chamber 13 corresponding to the program that has been transferred by the program transfer unit 73. The comparison unit 75 compares the set temperature θs set by the temperature setting unit 74 with the internal temperature θ detected by the temperature sensor 15 of the low temperature chamber 13 and outputs the comparison result to the control unit 76. The control unit 76 controls the compressor 2, the blower fan 4, and the air brake 17 based on the comparison result obtained by the comparison unit 75 so that the internal temperature θ detected by the temperature sensor 15 reaches the set temperature θs. The storage unit 77 is composed of, for example, a non-volatile semiconductor memory, etc., and stores various data and operation programs for temperature control.

The temperature control of the low temperature chamber 13 performed by the control device 7 will be described in detail with reference to FIG. 6. Fig. 6 is a graph showing changes with time in the set temperature of the low temperature chamber and the temperature in the compartment when the temperature control of the refrigerator according to the embodiment of the present invention is implemented. As shown in FIG. 6, in the temperature control of the low temperature chamber 13, a cycle including a low temperature program and a temperature increase program is repeated. Specifically, the program transition unit 73 transitions to the temperature increase program when the low temperature program time ΔTL has passed since the start of the low temperature program. In addition, when the temperature-raising program time ΔTH has elapsed from the start of the temperature-raising program, it will move to the low-temperature program again. The low temperature program time ΔTL and the temperature increase program time ΔTH are determined by each body according to the method described later and stored in the memory 77. In addition, the low temperature program corresponds to the "first program" of the present invention, and the temperature rise program corresponds to the "second program" of the present invention. In addition, the low temperature program time ΔTL corresponds to the "first time" of the present invention, and the temperature increase program time ΔTH corresponds to the "second time" of the present invention.

In the low temperature program, the temperature setting section 74 sets the set temperature θs to the low temperature set temperature θL, and the control section 76 lowers the temperature in the low temperature chamber 13 until it reaches the low temperature set temperature θL. The low-temperature set temperature θL is a temperature lower than the freezing point θf (for example, 0°C) of the to-be-cooled object contained in the lower greenhouse 13, and is, for example, -4°C to -2°C. In the temperature increase program, the temperature setting unit 74 sets the temperature setting θs to the temperature increase setting temperature θH, and the control unit 76 increases the temperature in the low temperature chamber 13 until it reaches the temperature increase setting temperature θH. The temperature rise setting temperature θH is a temperature higher than the freezing point θf of the object to be cooled contained in the lower greenhouse 13, and is, for example, 1°C to 2°C. The low temperature set temperature θL and the temperature rise set temperature θH have a relationship of θH>θL, and are stored in the memory 77 in advance. In addition, the low temperature set temperature θL and the temperature rise set temperature θH can also be changed or set by the user through the operating unit 61. The low temperature set temperature θL corresponds to the first temperature of the present invention, and the temperature rise set temperature θH corresponds to the second temperature of the present invention.

In addition, the low-temperature program includes an introduction program and a low-temperature maintenance program. As shown in FIG. 6, in the introduction program, the temperature setting unit 74 causes the set temperature θs to decrease stepwise every time set in advance. This step is counted by the counter 72. The program transition unit 73 transitions to the low temperature maintenance program when the count value of the counter 72 has reached the target value. The target value is determined in advance so that the set temperature θs reaches the low temperature set temperature θL at the time TL1. In the low-temperature maintenance program, the temperature setting unit 74 sets the set temperature θs to the low-temperature set temperature θL, and the control unit 76 lowers the temperature in the low-temperature chamber 13 until it reaches the low-temperature set temperature θL. Through the low temperature process as described above, the object to be cooled in the low temperature chamber 13 becomes a non-freezing and supercooled state below the freezing point θf. Then, the program transition section 73, when the time TL is reached, that is, when the low temperature program time ΔTL has passed since the start of the low temperature program, the low temperature program is ended, and the low temperature program is moved to the temperature rise program.

In the temperature rising program, the temperature setting unit 74 sets the set temperature θs of the low temperature chamber 13 to the temperature rise set temperature θH, and the control unit 76 increases the temperature of the low temperature chamber 13 to reach the temperature rise set temperature θH. Specifically, the control unit 76 closes the air lock 17 to stop the state of the cold air flowing into the low-temperature chamber 13 and raise the temperature in the low-temperature chamber 13. In addition, when the compressor 2 is stopped, the blower fan 4 is operated, and the air brake 17 is opened to circulate the air in the refrigerator 1, thereby increasing the temperature in the low-temperature chamber 13 as another method. In addition, it is also possible to use the heater 18 to raise the temperature instantaneously as another method. Then, the program transition section 73, when the time TH arrives, that is, when the temperature increase program time ΔTH has passed since the start of the temperature increase program, the temperature increase program is ended, and the low temperature program is moved to.

Fig. 7 is a flowchart showing the temperature control process in the low temperature chamber in the refrigerator according to the embodiment of the present invention. Referring to Figs. 1 to 7, the temperature control process in the low temperature chamber in the refrigerator according to the embodiment will be described. When the power supply is turned on in the refrigerator 1, when the start of the process is selected by the or operation panel 6, this process is started. First, the control device 7 detects the internal temperature θ of the low-temperature chamber 13 by the temperature sensor 15, and determines whether the detected internal temperature θ is higher than the temperature increase set temperature θH (S101). Then, when the internal temperature θ has not reached the temperature increase set temperature θH, (S101: [No]), step S112 is performed to start the temperature increase program. On the other hand, when the internal temperature θ is equal to or higher than the temperature increase set temperature θH (S101: [Yes]), the low temperature program is started. Then, the elapsed time T is reset by the timer unit 71, and the measurement of the elapsed time T is started (S102).

In the low temperature program, the introduction program is implemented first. In the introduction program, the temperature setting unit 74 sets the set temperature θs to θH-Δθ (S103). Then, the count value i of the counter 72 is set to 0 (S104). In addition, the elapsed time t is reset by the timer unit 71, and the measurement of the elapsed time t is started (S105). Here, the set temperature θs of the low temperature chamber 13 is set to a temperature lower by Δθ (for example, 0.3° C.) than the heating set temperature θH, and the counting of steps in the introduction program and the measurement of the elapsed time t of each step are started.

Subsequently, the temperature setting unit 74 determines whether the elapsed time t is greater than or equal to Δt (S106). Here, Δt is the time to introduce each step in the program, and it is, for example, 20 minutes. Then, when the elapsed time t has not reached Δt (S106), the set temperature θs set in step S103 is maintained until the elapsed time t becomes Δt or more. On the other hand, when the elapsed time t is greater than or equal to Δt (S106: [Yes]), the set temperature θs is set to θs-Δθ (S107), and the count value i is incremented by 1 (S108).

設定溫度θs就階梯式地降低△θ，庫內溫度θ也降低為設定溫度θs。 Subsequently, the program transition unit 73 determines whether or not the count value i is n or more (S109). Here, n represents the number of steps in the lead-in program, which is 12, for example. When the count value i has not reached n (S109: [No]), the process returns to step S105 and the subsequent processing is repeated. In this way, every pre-set time △t, the low temperature room 13

The set temperature θs decreases stepwise by Δθ, and the internal temperature θ also decreases to the set temperature θs.

On the other hand, when the count value i is n or more (S109: [Yes]), the program transition unit 73 transitions to the low-temperature maintenance program. Then, the temperature setting unit 74 sets the set temperature θs to the low temperature set temperature θL (S110). Next, it is judged whether the elapsed time T from the start of the low-temperature program is greater than or equal to ΔTL (S111). Then, when the elapsed time T has not reached the low temperature program time ΔTL (S111: [No]), the set temperature θs (ie, the low temperature set temperature θL) set in step S110 is maintained until the elapsed time T is the low temperature program Time is above △TL. On the other hand, when the elapsed time T is longer than the low temperature program time ?TL (S111: [Yes]), step S112 is performed to start the temperature increase program.

In the temperature rising program, the elapsed time T is reset by the timer unit 71, and the measurement of the elapsed time T is restarted (S112). Then, the temperature setting unit 74 sets the set temperature θs of the low temperature chamber 13 to the temperature rise set temperature θH (S113). Subsequently, the program transition unit 73 determines whether or not the elapsed time T is equal to or greater than the temperature increase program time ΔTH (S114). Then, when the elapsed time T has not reached the temperature-raising program time ΔTH (S114: [No]), the set temperature θs (that is, the temperature-raising set temperature θH) set in step S113 is maintained until the elapsed time T is the temperature-raising program Time is above △TH. On the other hand, when the elapsed time T is greater than or equal to the temperature increase program time ΔTH (S114: [Yes]), the temperature increase program is ended, and the process returns to step S102 to start the low temperature program again.

Here, in the low-temperature process, the object to be cooled in the low-temperature chamber 13 is in a supercooled state that does not freeze even if it is below the freezing point θf, but the supercooled state is a state in which energy is unstable. Therefore, for example, when an impact such as opening and closing of the door 8 or a sudden temperature change in the low temperature chamber 13 caused by some reasons, the supercooling state may be released. When the supercooled state of the object to be cooled is released, fine ice crystals begin to be generated substantially in the same manner in the object to be cooled, and freezing begins. Therefore, as described above, when the low-temperature program time △TL has passed since the start of the low-temperature program, shift to the temperature-raising program, thereby avoiding the progress and termination of freezing, and preventing damage to the tissues or cells of the cooled object due to ice crystals. Etc. cause damage. In addition, when the temperature-raising program time ΔTH has passed since the start of the temperature-raising program, shifting to the low-temperature program can suppress the deterioration of the quality of the object to be cooled.

However, the quality of the cooled object may be reduced due to the length of the low temperature program time △TL and the temperature rise program time △TH. For example, relative to the low temperature program time ΔTL, if the temperature increase program time ΔTH is too short, the ice crystals of the object to be cooled cannot be melted sufficiently, so that the freezing of the object to be cooled continues. In addition, compared with the low temperature program time ΔTL, if the temperature increase program time ΔTH is too long, the average temperature during the storage period of the cooled object becomes higher than the freezing point θf, which may cause the object to be cooled The quality is reduced. Therefore, in this embodiment, the low temperature program time ΔTL and the temperature increase program time ΔTH are set in consideration of the time for identifying the freezing of the object to be cooled and the heat balance.

8 and 9, the setting of the low temperature program time ΔTL and the temperature rise program time ΔTH in this embodiment will be described. Figure 8 shows the temperature control in the refrigerator according to the embodiment of the present invention, the set temperature of the low temperature room and the time-dependent changes in the temperature in the compartment, the heat released by the cooling object q1, and the heat supplied to the cooling object q2 Chart. Fig. 9 shows the relationship between the freezing time (freezing time) of the object to be cooled after the supercooling of the object to be cooled is released when the low temperature setting temperature θL is -3°C, and the number of rupture peaks when the object to be cooled is cut off. Diagram of relationship.

(Setting of low temperature program time △TL)

The low-temperature program time ΔTL is set to satisfy the following conditions determined by a simple experiment. First, the cooling rate in the lead-in program is set to make the object to be cooled, such as food, enter the supercooled state. For example, it is known from experiments that when the low temperature set temperature θL is -3°C, when the cooling time per 1°C is 35 minutes or more, the object to be cooled is highly likely to enter the supercooled state. Therefore, the cooling rate of the induction program is arbitrarily set so that this condition is satisfied. As a result, as shown in FIG. 8, the time ΔTf1 from the start of the low-temperature program (that is, the start of the introduction program) to the freezing point θf of the object to be cooled and the time TL1 until the end of the introduction program are determined. Then, the low temperature program time ΔTL is set to satisfy time TL1<time TL.

In addition, the low-temperature program time ΔTL must be set to be less than the time until the freezing of the object to be cooled is recognized. Here, the reason for setting the low temperature program time ΔTL to be less than the time until freezing is recognized will be explained with reference to FIG. 9.

When freezing progresses after the supercooling is released, the generation and growth of ice crystals in the object to be cooled progresses, and the touch of the food as the object to be cooled changes. The changes that people recognize that the object to be cooled has been frozen include: the hardness when touched, and the shattering sensation of ice particles breaking when it is cut. However, it is known from experiments that even if ice crystals are generated in a few hours after the supercooling is released, it is very fine and very small, so the touch of the cooled object hardly changes. The number of breaking peaks shown in FIG. 9 is the number of maximum points in the time change waveform of the cutting load from the start of the cutting to the end of the cutting, and represents the screaming feeling of the ice particles being broken. In addition, Fig. 9 shows the deviation of the number of breaking peaks per freezing time on the graph. As shown in Fig. 9, in the non-freezing state (freezing time 0 hour) and the state after 6 hours have passed since the beginning of freezing, there was almost no change in the number of peak breaking peaks. In other words, it can be seen that the touch of the object to be cooled hardly changed from the non-freezing state after the freezing began to 6 hours, and it was not recognized as frozen. In addition, it can be seen from FIG. 9 that the boundary between the non-freezing state (freezing time 0 hour) and the state that can be recognized as frozen is 8 hours. Therefore, by setting the low-temperature program time ΔTL to 8 hours or less (for example, 300 minutes), it is possible to move to the temperature-raising program before the freezing of the object to be cooled is recognized. Hereinafter, the time until the freezing of the object to be cooled is recognized is referred to as "allowable freezing time". In addition, the 8-hour system is an example, and the allowable freezing time varies with the body and the low-temperature set temperature θL.

(Setting of heating program time △TH)

In addition, it can be seen from Figure 9 that even if all the ice crystals that have been generated are not melted, by returning it to the state shortly after the release of supercooling or within a few hours, it can be maintained substantially in the same state as the non-freezing state. . Therefore, the low-temperature program time ΔTL is set to be less than the allowable freezing time (for example, 8 hours) until the freezing of the object to be cooled is recognized, so that there is no need to surely melt the ice crystals that have been generated during the temperature-raising program. However, in order to prevent the freezing from continuing, a balance of heat must be achieved in the low-temperature program and the warm-up program. Therefore, setting the temperature-raising program time ΔTH makes it possible to achieve a balance of heat in the low-temperature program and the temperature-raising program.

In the low temperature program shown in FIG. 8, the time when the internal temperature θ(T) detected by the temperature sensor 15 reaches the freezing point θf of the object to be cooled is Tf1. In addition, in the temperature increase program, the time when the internal temperature θ(T) reaches the freezing point θf of the object to be cooled is Tf2. In addition, in the low temperature program of the next cycle, the time when the internal temperature θ(T) reaches the freezing point θf of the object to be cooled is Tf3. In addition, after the start of the temperature increase program, the time until the internal temperature θ(T) reaches the freezing point θf of the object to be cooled is ΔTf2. In addition, after the start of the low-temperature program of the next cycle, the time until the internal temperature θ(T) reaches the freezing point θf of the object to be cooled is ΔTf1.

During the period of time ΔT1 when the internal temperature θ(T) is lower than the freezing point θf (that is, the period of Tf2-Tf1), the heat emitted by the object to be cooled whose temperature is fixed at the freezing point θf is q1. In addition, during the period of time ΔT2 in which the internal temperature θ(T) is higher than the freezing point θf (that is, the period of Tf3-Tf2), the amount of heat supplied to the object to be cooled whose temperature is fixed at the freezing point θf is q2. The heat quantity q1 is represented by the following formula (1), which corresponds to the hatched area between θf between Tf1 and Tf2 and the internal temperature θ(T) in the area of the hatched part in Fig. 8. That is, the heat quantity q1 is the time integral value of the difference between the freezing point θf and the internal temperature θ(T) during the period when the internal temperature θ(T) is lower than the freezing point θf. The heat quantity q2 is represented by the following formula (2), which corresponds to the area of the hatched part in FIG. 8 between the hatched part between θf from Tf2 to Tf3 and the internal temperature θ(T). That is, the heat quantity q2 is the time integral value of the difference between the internal temperature θ(T) and the freezing point θf during the period when the internal temperature θ(T) is higher than the freezing point θf. In addition, the heat quantity q1 corresponds to the first heat quantity of the present invention, and the heat quantity q2 corresponds to the second heat quantity of the present invention.

In this embodiment, the temperature increase program time ΔTH is set so that the heat quantity q1 and the heat quantity q2 are in a balanced state. That is, the heating program time ΔTH is set so that the heat q1 and the heat q2 are equal, that is, the heat q1=q2 is satisfied. In addition, the so-called heat quantity q1 and heat quantity q2 are equal, and include not only the case where the heat quantity q1 and the heat quantity q2 are exactly the same, but also the state where the heat quantity q1 and the heat quantity q2 are not the same but are balanced. Specifically, considering the quality of food preservation, the range of calorie q1≦calorie q2≦calorie q1×1.05 is better. As mentioned above, because the low temperature program time △TL is set below the allowable freezing time, there is no need to melt the ice crystals of the cooling object as in the past, and the temperature increase program time △TH is shorter than the past ice crystals of the cooling object. Melting situation.

The temperature increase program time ΔTH can be obtained from the low temperature program time ΔTL in the following manner. First, the time ΔTf2 and the time Tf2 from the beginning of the initial temperature-rising program of the temperature-rising speed ball until the internal temperature θ(T) reaches the freezing point θf. The rate of temperature rise is determined by experiment. Next, from the area of the shaded portion in FIG. 8, the heat quantity q1 shown in the formula (1) is expressed as an approximate formula in accordance with the following formula (3). In addition, from the area of the shaded portion in FIG. 8, the heat quantity q2 shown in the formula (2) is expressed as an approximate formula in accordance with the following formula (4). According to formulas (3) and (4), calculate the heating program time △TH, so that the heat quantity q1=the heat quantity q2 is satisfied. The temperature increase program time ΔTH is, for example, 240 minutes.

As described above, in this embodiment, the low-temperature program time ΔTL is set to satisfy time TL1<time TL, and to be less than or equal to the allowable freezing time. In addition, the temperature increase program time ΔTH is based on the low temperature program time ΔTL, the heat quantity q1, and the heat quantity q2, and is set in a state where the heat quantity q1 and the heat quantity q2 are balanced.

(Temperature change of the object to be cooled)

Next, the temperature transition of the to-be-cooled object (for example, food) when the temperature control of this embodiment is implemented is demonstrated. Fig. 10 is a diagram showing changes with time in the setting temperature, internal temperature, and food temperature in the low-temperature chamber when the temperature control in the refrigerator according to the embodiment of the present invention is implemented, showing that the object to be cooled has not been released from overcooling An example of the chart. Fig. 11 is a diagram showing changes with time in the setting temperature, the temperature in the compartment, and the temperature of the food in the low-temperature chamber when the temperature control in the refrigerator according to the embodiment of the present invention is implemented, showing that the object to be cooled has been released from overcooling An example of the chart.

First, as shown in Fig. 10, when the food does not cause the release of supercooling, the temperature in the greenhouse 13 is slightly delayed when the food temperature is low, and the change in the temperature between the low temperature set temperature θL and the heating set temperature θH is the same The ground changes continuously. Thereby, the food in the low temperature room 13 can be repeatedly restored to the supercooled state during the low temperature process.

In addition, as shown in FIG. 11, at the time Tf when the temperature of the food reaches the freezing point θf or less, when the supercooling is released, fine ice crystals are generated in the food, and freezing starts. Next, at time TL, the set temperature θs of the low-temperature chamber 13 is switched to the rising set temperature θH, thereby starting the melting of the fine ice crystals inside the food. Then, at the time TH when the temperature rising program ends, the food returns to a state equivalent to a non-freezing state. In the next cycle of the cycle in which the supercooled state is found, at the time Tf1 when the temperature of the food reaches the freezing point θf or less, the food does not enter the supercooled state but starts to freeze and becomes a phase change state.

At this time, in the present embodiment, the temperature-raising program time ΔTH is set so that the heat quantity q1=the heat quantity q2 is satisfied. Therefore, the heat quantity q1 for freezing progress and the heat quantity q2 for melting ice crystals are equal. In addition, the low-temperature program time △TL is set below the allowable freezing time. Therefore, at the time TH_2 when the temperature rising program ends, the refrigerator 1 can restore the food to a state equivalent to shortly after the supercooling is released, that is, the time Tf1 and shortly after the freezing starts.

On the other hand, FIG. 12 and FIG. 13 are graphs which show the time-dependent change of the set temperature of a low temperature room, the temperature in a store|warehouse, and a foodstuff temperature in the case of implementing temperature control in a comparative example. In addition, FIG. 12 shows an example of the case where the temperature increase program time ΔTH is set such that the heat quantity q1>the heat quantity q2, and FIG. 13 shows an example of the case where the temperature increase program time ΔTH is set such that the heat quantity q1<the heat quantity q2.

As shown in Figure 12, when the heating program time ΔTH is set such that the heat q1>the heat q2, as the cycle progresses, the ice crystals that have been produced in the supercooled state grow and freeze, and the freezing ends soon. Specifically, at the time Tf when the temperature of the food reaches the freezing point θf or less, the supercooling of the food is released, fine ice crystals are generated, and freezing starts. Next, at time TL, the set temperature θs of the low-temperature chamber 13 is switched to the temperature rise set temperature θH, and the melting of the fine ice crystals in the food starts. When the time from time Tf to time TL is short, the food returns to a state equivalent to a non-frozen state at time TH when the temperature rising program ends.

In the next cycle after the cycle in which the release of the supercooling is found, at the time Tf1 when the temperature of the food reaches the freezing point θf or less, the food does not enter the supercooled state but starts to freeze and enters a phase change state. At this time, because the heating program time ΔTH is set such that the heat q1>the heat q2, the heat q1 for freezing is greater than the heat q2 for melting ice crystals. Therefore, the freezing of the food proceeds, and the freezing will end at any point in time. That is, when the temperature increase program time ΔTH is set such that the heat quantity q1>the heat quantity q2, it is difficult to prevent the freezing of the food that has been overcooled from progressing.

Fig. 13 shows the case where the heating program time △TH is set such that the heat quantity q1<the heat quantity q2. In more detail, for example, it shows that considering the heat quantity q0 released by foods such as food when the supercooling is released, the heating program time ΔTH is set so that q0+q1≦q2. The heat quantity q0 corresponds to the third heat quantity of the present embodiment, and it is calculated by the following formula (5), for example. Here, θT is the temperature at which the supercooling is released, W is the moisture content of the food, and Cp is the heat capacity of water.

[Math 5] q 0=△( θT - θL )× W × Cp . . . . (5)

By setting the temperature increase program time △TH to satisfy q0+q1≦q2, the ice crystals generated in the food when the supercooling is released can be completely melted and completely restored to a non-freezing state. Thereby, the next cycle will definitely be able to enter the supercooled state. Therefore, the heat q1 is the heat released by the food whose temperature is fixed at the freezing point θf during the low-temperature maintenance program. However, in this case, because the ice crystals that have been generated in the food are completely melted, the temperature-raising program time ΔTH becomes longer, and the average temperature of the food will inevitably become higher.

As described above, according to the refrigerator 1 of this embodiment, considering the allowable freezing time and heat balance of the object to be cooled, the low-temperature program time ΔTL and the temperature-raising program time ΔTH are set to perform periodic temperature control. Specifically, the low temperature program time ΔTL is set within the allowable freezing time, and the temperature rise program time ΔTH is set so that the heat q1 for freezing and the heat q2 for melting ice crystals are balanced. Therefore, the refrigerator 1 of the present embodiment can achieve a balance between the time and heat for recognizing the freezing of the object to be cooled through the low-temperature program and the temperature-raising program. The cooling object returns to the same state as the supercooled state, and the average temperature of the cooling object during the storage period can be lowered. Therefore, the refrigerator 1 in this embodiment does not adversely affect the object to be cooled, and can prevent the freezing of the object to be cooled from ending.

In addition, the low-temperature program includes an introduction program and a low-temperature maintenance program, which can make the object to be cooled in the low-temperature chamber 13 into a supercooled state. In addition, in the temperature increase program, the air brake 17 is controlled to lower the temperature chamber 13, thereby eliminating the need for a heat source to increase the temperature, and it is possible to prevent an increase in the number of parts and power consumption.

In addition, the control device 7 has been described above as a device that controls the damper 17 and the heater 18 in the temperature increase program, but it is not limited to this. For example, the control device 7 does not control the air lock 17 during the temperature increase program, but only controls the heater 18 to increase the temperature of the low temperature chamber 13. In addition, the heating device is not limited to the heater 18, and may be a heat exchanger, a Pallet element, or the like.

In addition, in the conventional refrigerator, in the case where the function of making the cooling object into a supercooled state is added to the lower part of the refrigerator compartment 100, since the low temperature room 13 as the supercooling control area is adjacent to the vegetable compartment 200, all the vegetable compartments 200 have It may be too cold. Therefore, it is necessary to form a heat-insulating structure with an appropriate heat-insulating material between the low-temperature greenhouse 13 and the vegetable room 200, which strengthens the structural restriction.

Therefore, the refrigerator 1 of the present embodiment is provided with a partition plate 40 arranged in parallel with the partition member 50 between the low temperature room 13 and the vegetable compartment 200 located below the low temperature room 13 and the partition plate 40 and the partition structure. The area enclosed by the material 50 has the heater 18 as a heating device, and the heater 18 is controlled by the control device 7 so that the temperature in the vegetable compartment 200 can be increased. That is, in the refrigerator 1 of the embodiment, even if the vegetable compartment 200 and the low-temperature chamber 13 are adjacent to each other, by supplying heat to the vegetable compartment 200 with the heater 18, the vegetable compartment 200 can be prevented from being overcooled. Therefore, the partition required in the past is not required. Hot material. Accordingly, the refrigerator 1 of this embodiment relates to a refrigerator that does not use a heat insulating material, and has a function of making the object to be cooled in a supercooled state, and does not allow the vegetable compartment 200 to be overcooled, but can make the object to be cooled It is in a supercooled state.

Furthermore, in the refrigerator 1 of the embodiment, the area enclosed by the partition 40 and the partition member 50 is divided into a plurality of spaces by the partition 40 or the rib (rib region 20) protruding from the partition member 50. The heater 18 is provided in one of the partitioned spaces, so the heat generation density of the heater 18 can be increased, and the temperature in the storage room can be effectively increased.

Above, the embodiments of the present invention have been described based on the drawings, but the specific structure of the present invention is not limited to this, and the supercooling control can be changed within the possible range. For example, in the above-mentioned embodiment, since it is not necessary to completely melt ice crystals generated due to the release of supercooling of the object to be cooled in the temperature increase program, the temperature increase program time ΔTH is configured such that the heat quantity q1 = the heat quantity q2. In this case, the relationship of the heat including the heat q0 released by the object to be cooled when the supercooling is released is q1=q2<(q0+q1). Here, even if the heat quantity q1=heat quantity q2 is not strict, and if q2<q0+q1 is satisfied, even if the heat quantity q1<the heat quantity q2, the heat quantity q1 and the heat quantity q2 are in a balanced state, and the above-mentioned embodiment can be obtained. The same effect. Therefore, the heating program time ΔTH can also be obtained, so that the heat q1<the heat q2, and satisfies the heat q2<(the heat q0+the heat q1).

In addition, the to-be-cooled objects stored in the refrigerator 1 not only include foods, but also all items that can be stored in a supercooled state, such as items collected from nature such as raw meat of non-edible small animals, or the like. Reproduction of raw meat of animals used in experiments such as animals.

Claims (7)

A refrigerator, comprising: a heat-insulating box body with a storage space partitioned into a plurality of storage rooms by partitioning materials; a low-temperature room is provided as one of the above-mentioned storage rooms, and the object to be cooled is not frozen In the state of being stored at a temperature below the freezing point; a cooling device to cool the storage space; a partition plate arranged in parallel with the partition member between the low-temperature chamber and the storage room located below the low-temperature chamber ; Heating device is provided in the area enclosed by the partition and the partition member; the control device controls the cooling device to repeatedly execute the temperature in the low-temperature chamber in the preset time, from higher than the above The first process of reducing the second temperature of the freezing point of the object to be cooled to the first temperature lower than the freezing point, and increasing it from the first temperature to the second temperature, and making the second temperature The second program of maintaining the temperature for a preset time; the area enclosed by the partition and the partition member is divided in the horizontal direction by the partition or the rib protruding from the partition member In a plurality of partitioned spaces, the heating device is installed in one of the partitioned spaces, and the other space is a still air area; the control device, in the second program, controls the cooling device and controls the A heating device that raises the temperature in the low-temperature chamber from the first temperature to the second temperature, and performs control so that the temperature in the low-temperature chamber is lower than the freezing point and the freezing point in the state where the freezing point is lower than the freezing point. The time integral value of the difference in temperature in the low-temperature room, and the above-mentioned low-temperature room The time integral value of the difference between the freezing point and the internal temperature of the low-temperature chamber in a state where the internal temperature is higher than the freezing point is balanced. A refrigerator, comprising: a heat-insulating box body with a storage space partitioned into a plurality of storage rooms by partitioning materials; a low-temperature room is provided as one of the above-mentioned storage rooms, and the object to be cooled is not frozen In the state of being stored at a temperature below the freezing point; a cooling device to cool the storage space; a partition plate arranged in parallel with the partition member between the low-temperature chamber and the storage room located below the low-temperature chamber ; Heating device is provided in the area enclosed by the partition and the partition member; the control device controls the cooling device to repeatedly execute the temperature in the low-temperature chamber in the preset time, from higher than the above The first process of reducing the second temperature of the freezing point of the object to be cooled to the first temperature lower than the freezing point, and increasing it from the first temperature to the second temperature, and making the second temperature The second program of maintaining the temperature for a preset time; the area enclosed by the partition and the partition member is divided in the horizontal direction by the partition or the rib protruding from the partition member In a plurality of partitioned spaces, the heating device is installed in one of the partitioned spaces, and the other space is a still air area; the control device controls the heating device to increase the temperature in the storage room , Execute control so that the temperature in the low-temperature room is lower than the freezing point in the state of the freezing point and the time integral value of the difference between the temperature in the low-temperature room, and the temperature in the low-temperature room is high Above The time integral value of the difference between the freezing point and the internal temperature of the low-temperature chamber in the freezing point state is balanced. As for the refrigerator described in item 1 or 2 of the scope of patent application, the control device controls the cooling device in the first program so that the set temperature decreases stepwise every pre-set time, from the second temperature to the first Temperature. For the refrigerator described in item 3 of the scope of patent application, the above-mentioned first program is composed of the following: an introduction program, which lowers the set temperature from the above-mentioned second temperature until reaching the above-mentioned first temperature every pre-set time; and a low-temperature maintenance program, which will The set temperature that has reached the above-mentioned first temperature is maintained for a predetermined time. For the refrigerator described in item 1 or 2 of the scope of the patent application, the cooling device includes: an air passage for sending cold air to the low-temperature chamber, and an air brake for adjusting the air volume of the cold air supplied to the low-temperature chamber; In the second program, the air lock is controlled to increase the internal temperature of the low temperature chamber from the first temperature to the second temperature. A refrigerator comprising: a heat-insulating box body with a storage space partitioned into a plurality of storage rooms by partitioning materials; a low-temperature room is provided as one of the above-mentioned storage rooms, and the object to be cooled is not frozen In the state of being stored at a temperature below the freezing point; a cooling device to cool the storage space; between the low-temperature room and the storage room located below the low-temperature room A partition plate arranged in parallel with the partition member; a heating device arranged in the area enclosed by the partition member and the partition member; and a control device that controls the cooling device to repeatedly execute the interior of the low-temperature chamber The first program in which the temperature is lowered from the second temperature higher than the freezing point of the object to be cooled to the first temperature lower than the freezing point in the preset time, and the temperature is increased from the first temperature The second program to maintain the second temperature for a preset time until the second temperature; the area enclosed by the partition and the partition member is protruded from the partition or from the partition member The ribs are divided into a plurality of partitioned spaces along the horizontal direction. One of the partitioned spaces is provided with the heating device, and the other space is a still air area; the control device executes control to The time integral value of the difference between the freezing point and the temperature in the low-temperature chamber in a state where the temperature in the low-temperature chamber is lower than the freezing point, and the temperature in the low-temperature chamber is higher than the freezing point The time integral value of the difference between the freezing point and the internal temperature of the low-temperature chamber in the state of a point is balanced. In the refrigerator described in item 6 of the scope of patent application, the control device controls the cooling device and controls the heating device in the second program so that the temperature in the low-temperature room rises from the first temperature to the first temperature 2Temperature.

Images