JP2777398B2 - Cooling storage - Google Patents

Description

The present invention relates to a cooling storage having a storage room for cooling and storing food.

(B) Conventional technology In a conventional refrigerator or the like, for example, since the freezing room was limited to about −20 ° C., it was not possible to prevent protein deterioration of frozen foods. 1988
It has been considered that an independent refrigerant circuit for a freezing room is prepared as in No. 24268, and the freezing room can be cooled to a lower freezing temperature (-30 ° C. or lower).

(C) Problems to be Solved by the Invention However, when the freezing temperature is controlled to be lower, the temperature of the cooler is also extremely low, so that it takes a long time for defrosting. When the temperature is low, the heat generated by the defrost heater greatly affects the food, and the temperature of the food in the freezer compartment abnormally rises despite the fact that the food is cooled to a lower freezing temperature.

Further, for example, a first freezer compartment and a second freezer compartment are formed by partition walls, and blowers are provided to supply cool air from a cooler to both the freezer compartments, respectively, and a compressor is provided based on the temperature of the second freezer compartment. Controlling the blower and the blower, and controlling the blower corresponding thereto based on the temperature of the first freezing room, and allowing the second freezing room to be cooled to a freezing temperature lower than the normal freezing temperature to the second freezing room. In order to achieve long-term preservation of food, when the second freezer is at a lower freezing temperature, the partition wall also contracts, and cool air leaks from the gap into the first storage. Therefore, the temperature of the first freezer compartment tends to decrease, and the operating rate of the blower corresponding thereto decreases. For that reason,
There has been a problem that the temperature distribution in the first freezer compartment becomes large, and in particular, the upper temperature near the door in contact with the outside air becomes high.

(D) Means for Solving the Problems The present invention has a storage room for achieving the above object,
In a cooling storage that can cool the storage room to a lower cooling temperature than a normal cooling temperature, when defrosting of the cooler is started in a state where the storage chamber is cooled to the lower cooling temperature, the normal defrosting is started before the defrosting starts. The storage room is controlled to be cooled at a temperature between the cooling temperature and a lower cooling temperature.

Further, in a cooling storage having a first storage room and a second storage room, one of which can be cooled to a lower cooling temperature than a normal cooling temperature, cooling the storage room to the lower cooling temperature. When defrosting of the vessel is started, both storage compartments are controlled to be cooled at a temperature between a normal cooling temperature and a lower cooling temperature before defrosting is started.

Further, according to the present invention, the first storage room and the second storage room are partitioned by a heat insulating partition wall, cool air from a cooler is supplied to both storage rooms for cooling, and one storage room is normally In a cooling storage that can be cooled to a cooling temperature lower than the cooling temperature, a pair of ridges are formed opposite to the wall surface forming both storage rooms, and one end of a surface corresponding to the wall surface of the partition wall is provided at one end. The partition wall is attached between the wall surfaces by forming a step portion and bringing the step portion into close contact with the jetty via a sealing material.

(E) Operation According to the cooling storage configured as described above, the stored food can be stored for a long time in a state where the food is cooled to a lower cooling temperature, and the temperature can be raised to some extent before the defrost of the cooler. .

Further, when there are two storage rooms, the temperature of the room having the normal cooling temperature is lowered before the start of defrosting, and the temperature rise during defrosting can be suppressed.

Furthermore, according to the third aspect, even if the partition wall extending between the wall surfaces shrinks due to the temperature difference between the two sides of the partition wall, the step portion is in close contact with the jetty via the sealing material in that direction, so that the surface in close contact Can be absorbed in the direction parallel to.

(F) Example Next, an example will be described with reference to the drawings. FIG. 1 shows a front view of a refrigerator 1 as an embodiment of a cooling storage. The front opening of the refrigerator 1 is closed by a pair of double doors 2, 3 and 4 and 5 at the top and bottom, respectively, and the lowermost stage is closed by a drawer door 6. Further, a control box 7 protrudes between the doors 2, 3, 4 and 5.

FIG. 2 shows a front view of the refrigerator 1 excluding the doors 2, 3, 4 and 5, and FIGS. 3 and 4 show a sectional view taken along line AA and a line BB of FIG. 2, respectively. . Fig. 5 is the partition wall
FIG. 6 is a perspective view of a portion 13 and FIG. 6 is a sectional view taken along the line CC of FIG. A heat insulating material 10 is filled between the outer box 8 opening forward and the inner box 9 incorporated therein by an in-situ foaming method to form a heat insulating box 11. The inside of the heat-insulating box 11 is vertically divided by a heat-insulating partition wall 12, and is separated from each other to form an upper chamber and a lower chamber that are independent from each other in air circulation. This upper chamber further includes the top surface of the inner box 9 and the partition wall.
A first freezing compartment 14 and a second freezing compartment 15 are formed by dividing into left and right by a heat insulating partition wall 13 fitted between the upper surfaces of the 12 freezing compartments.

The partition wall 13 is configured by inserting and mounting a heat insulating material 83 between hard resin outer plates. Further, a step 88 is formed at the left end of the upper and lower surfaces of the partition wall 13 in the front and rear directions. On the upper surface of the inner box 9, a jetty 84 protruding downward from front to back is integrally formed, and a jetty 85 protruding upward is formed on the partition wall 12 corresponding to the lower part. ing. The partition wall 13 has a vertical dimension that fits almost exactly between the upper surface of the inner box 9 and the partition wall 12, and is inserted between the inner box 9 and the partition wall 12 from the right side in FIG. 6 to seal the steps 88, 88 at this time. Lumber 87, 87
The piers 84 and 85 are attached to each other through close contact.

An upper cooling chamber 17 is formed at the back of the upper chamber by a partition plate 16 extending over the entire left and right widths.
18 is installed vertically. Above the cooler 18 and in the first freezer compartment
A blower 19 for the first freezing room 14 and a blower 20 for the second freezing room 15 are provided in the cooling room 17 located behind the second freezing room 15 and the second freezing room 15, respectively. In addition, outlets 21 and 22 are respectively formed in the partition plate 16 located in front of both the blowers 19 and 20, and an outlet 23 for ice making is located below the first freezing compartment 14.
An outlet 24 is formed below the second freezer compartment 15. The air outlets 21 and 23 and 22 and 24 are connected to each other by ducts 26 and 27 formed independently of a heat insulating plate 25 provided between the freezer compartment cooler 18 and the partition plate 16. The blowers 19 and 20 are propeller fans. The propeller fans rotate and suck the cool air that has exchanged heat with the freezer compartment cooler 18 and blow it out to the two freezer compartments 14 and 15 from the outlets 21 and 23 and the outlets 22 and 24, respectively. The cold air circulated through is sucked from the suction port 28 at the front part of the partition wall 12.

The inside of the first freezing compartment 14 is vertically divided (partially removed in FIG. 2) by a partition plate 32 attached corresponding to the ice making outlet 23, and the lower portion thereof contains an ice tray 33 for accommodating an ice tray 33. Room 34. The partition plate 32 is hollow inside, and its internal space 35 communicates with the air outlet 23, and a number of outlets 36 are formed on the lower surface from the back to the front, whereby the air outlet 33 is provided from above the lower ice tray 33. The cool air from 23 is blown almost uniformly. The upper surface of the partition plate 32 is used for placing frozen food.

The lower compartment below the partition wall 12 is a refrigerated compartment 38, and the upper portion thereof forms an ice hot compartment 41 by a heat insulating partition plate 39 and an inner door 40. A cooling chamber 43 is formed by a partition plate 42 above the refrigerator compartment 38 behind the ice greenhouse 41, and a refrigerator cooler 44 is provided therein.
Is installed vertically. A refrigerator 45 for the refrigerator is mounted above the refrigerator cooler 44.
41, a duct 42a extending upward is formed. A duct extending from the space in front of the blower 45 on both sides of the cooler 44 downward and opening to the refrigerator compartment 38 between the refrigerator cooler 44 and the partition plate 42
An insulating plate 48 for making 47 is provided. The blower 45 is a propeller fan that rotates to suck cold air that has exchanged heat with the refrigerator compartment cooler 44, blows out the air forward, and discharges cold air into the ice greenhouse 41 from a plurality of discharge ports 49 formed on both sides of the duct 42a. At the same time, cold air is supplied from the duct 47 to the refrigerator compartment 38 through the outlet 46. The cool air that has cooled the ice warm chamber 41 is formed from a suction port 50 formed in the partition plate 42, and the cool air that has cooled the refrigerator compartment 38 is formed on the lower surface of the partition plate 39, extends from the partition plate 42, and extends through the suction port 51. Cooling chamber passing through a plurality of formed suction ducts 52
Return to 43.

A central shelf receiver 29 is attached to the duct 42a in a hanging manner,
Further, shelf supports 30, 30 are suspended opposite to the left and right sides in the ice temperature chamber 41. Two shelves 3 between these shelf holders 29, 30, 30
1, 31 are supported in parallel. A manual damper D for opening and closing the discharge port 49 is attached to the central shelf receiver 29,
Thereby, the temperature in the ice greenhouse 41 can be adjusted. Through holes 30 penetrated up and down in the shelf supports 30, 30
a, 30a1 are bored, whereby the cool air blown out from the discharge port 49 also flows down below the shelves 31, 31 to form an ice greenhouse 41.
The inside can be cooled without unevenness.

The lower part of the refrigerator compartment 38 is further partitioned by a partition plate 53 and a partition front 54, and a container 53 with an upper opening supported by a frame 55 on a door 6 is accommodated below the partition plate 53 and a vegetable compartment 57 inside. 58 is a small container provided in the container 56. Reference numeral 60 denotes a machine room formed at the lower part of the heat insulating box 11, and a base 61 provided at the rear of the machine room 60.
In addition, a first compressor 62 and a second compressor 63 as compressors are provided side by side. A first evaporating dish condenser 64 and a second evaporating dish condenser 65 are vertically arranged in the machine room 60 in front of the compressors 62 and 63 so as to evaporate on the first evaporating dish condenser 64. The plate 66 is placed. Machine room 60
The top wall 200 is inclined high to accommodate the compressors 62 and 63, but a recess 201 is formed in the top wall 200 at a position corresponding to the first compressor 62. The first compressor 62 forms a first refrigerant circuit including a first evaporating dish condenser 64 and a freezer compartment cooler 18, and the second compressor 63 includes a second evaporating dish condenser 65 and a refrigerator compartment condenser. Cooler 44
To form a second refrigerant circuit including:

FIG. 7 is a perspective view of the outer box 8 showing a structure in which the first refrigerant circuit and the second refrigerant circuit are incorporated in the electric heating box 11. High-temperature high-pressure refrigerant discharged from the discharge side D ₁ of the first compressor 62 flows into the first evaporation dish capacitor 64, and radiated to the inner flowing meandering from deeper in front, once the suction side S ₁
From After cooling lubricant back to the first compressor 62, flows into the condenser pipe 67 is disposed in the heat insulating material 10 side of the outer box 8 left presence section out of the D ₂ from the discharge side again, then the outer Box 8 opening edge, partition wall 13 front, partition wall 12 front and partition 54
After flowing into the condensation prevention pipe 68 disposed continuously in the front part, and further flowing through the condenser pipe 69 excreted on the side of the heat insulating material 10 in the front part on the right side of the outer box 8, it passes through the capillary tube 70 and cools the refrigerator. flows into vessel 18, is fed back from the suction pipe 71 to the suction side S ₂ of the first compressor 62. A first refrigerant circuit (hereinafter referred to as a refrigerant circuit) is formed by the condenser pipes 67 and 69 and the condensation prevention pipe 68
72. ) Constitute the first capacitor 73. The first refrigerant circuit 72 is filled with a refrigerant R502 (boiling point 4-6 ° C),
As a result, the temperature of the freezer compartment cooler 18 can be -3.2 ° C or lower, so that the first and second freezer compartments 14 and 15 can be cooled to an extremely low temperature of -30 ° C.

On the other hand the high-temperature high-pressure refrigerant discharged from the discharge side D ₃ of the second compressor 63 is a right side rear portion of the heat-insulating outer box 8 after flowing in a meandering shape to deeper from the front side to flow into the second evaporation dish capacitor 65 The condenser pipe flows into the condenser pipe 75 disposed on the material 10 side, flows through the condenser pipe 76 passing through the heat insulating material 10 at the rear edge of the outer box 8, and flows through the condenser pipe 76 disposed on the heat insulating material 10 side on the left side of the outer box 8. after flowing through 77, fed back from the suction pipe 79 flows into the refrigerating compartment cooler 44 through the capillary tube 78 to the suction side S ₃ of the second compressor 63. The condenser pipes 75, 76 and 77 constitute a second condenser 81 of a second refrigerant circuit (hereinafter referred to as 80). The second refrigerant circuit 80 is filled with the refrigerant R12 (boiling point −30 ° C.), so that the temperature of the refrigerator cooler 44 becomes about −15 ° C. As a result, the ice temperature chamber 41 can be cooled to an ice temperature storage temperature such as -2 ° C, and the refrigerating chamber 38 can be cooled to a refrigerator temperature such as + 6 ° C. Also, 89 and 90 are the refrigerator cooler 18 and the refrigerator cooler 44, respectively.
Is an electric heater for defrosting. Further, reference numeral 91 denotes an electric heater disposed in front of the partition wall 13, and reference numerals 92 and 92 denote electric heaters disposed inside the inner peripheral edges of the doors 2 and 3, respectively.

Here, the temperature of the refrigerant flowing through the dew condensation prevention pipe 68 of the first condenser 73 becomes relatively high, so that the opening edge of the heat insulating box 11 can be satisfactorily heated. Further, since the first condenser 73 is located as a whole in the front part of the outer box 8, there is no need for the dew condensation preventing pipe to cross the second condenser 81, so that the arrangement in the outer box 8 becomes easy. With such an arrangement, the refrigerator 1 as a whole also becomes compact.

In addition, the refrigerator cooler 44 is a refrigerator 3 having a relatively high temperature.
8. Since only the ice greenhouse 41 and the vegetable room 57 are cooled, the operation rate of the second compressor 63 decreases at low outside temperatures such as winter, but the heating of the evaporating dish 66 and the prevention of condensation of the heat insulating box 11 1
This is performed by the first evaporation dish condenser 64 and the dew condensation prevention pipe 68 of the refrigerant circuit 72, so that both are not insufficiently heated in winter or the like. On the other hand, since the insides of the first freezing compartment 14 and the second freezing compartment 15 are strongly cooled by the original freezing compartment cooler 18, a freezing temperature of −30 ° C. or less can be achieved.

Next, FIG. 8 shows a control device 93 of the refrigerator 1. Reference numeral 94 denotes a microcomputer, which is a sensor 95 for sensing the temperature of the first freezer compartment 14, a sensor 96 for sensing the temperature of the second freezer compartment 15, a sensor 97 for sensing the temperature of the refrigerator compartment 38, and cooling for the freezer compartment. Sensor 98 for sensing the temperature of the refrigerator 18, sensor 99 for sensing the temperature of the refrigerator cooler 44, the deep temperature switch 100 in the control box 7, and the quick freezing switch 1
01, the respective outputs of the rapid refrigeration switch 102, the temperature setting switches 103A and 103B of the first freezing compartment 14 and the second freezing compartment 15 and the temperature setting switch 104 of the refrigeration compartment 38 are inputted, and the microcomputer 94 outputs The first compressor 62, the second compressor 63, the blowers 19, 20, 45, and the electric heaters 89, 90, 91, and 92 are connected.

Next, the microcomputer 94 shown in FIGS.
The temperature control of both freezing compartments 14, 15 will be described based on the flowchart of FIG. 9 and 10, in step 105, it is determined whether or not the freezer compartment cooler 18 is being defrosted. If not, the process proceeds to step 122, in which the microcomputer 94 has a freezer compartment safety function. The timer TM1 determines whether the count of the timer TM1 is 0 or not.
It is determined whether the fixed point control flag 1 has been set at step 107 if it is 0. If it has been reset, the routine proceeds to step 110. In step 110, the sensor
A comparison operation is performed between the temperature T2 of the second freezer compartment 15 based on 96 and the set temperature A of the second freezer compartment 15 set by the switch 103B, for example, at any temperature between 16 ° C and −24 ° C. I do. Here, the upper limit temperature and the lower limit temperature are set above and below the set temperature A, and if the temperature T2 rises and becomes equal to or higher than the upper limit temperature, the process proceeds to step 112. If the temperature T2 becomes equal to or lower than the lower limit temperature, the process proceeds to step. If it is higher than the maximum temperature,
Proceed to step 112 to determine whether or not the first compressor 62 is operating. If stopped, proceed to step 113 to set 1 minute to TM2, and operate the first compressor 62 and the blower 20 in step 114. At 115, the electric heaters 91 and 92 are de-energized. Next, at step 124, it is determined whether TM1 is 0. Since it is 0, the routine proceeds to step 126, at which it is determined whether TM2 is 0. At step 113, since 1 minute is set, TM2 is subtracted at step 127.
If the temperature is lower than the lower limit temperature in step 110, the process proceeds to step 116 to determine whether the first compressor 62 is operating. If the first compressor 62 is in operation, the process proceeds to step 117, and TM1 is set to 5 minutes.
To stop the first compressor 62 and the blower 20,
At 119, it is determined by the switch 100 whether or not the second freezing room 15 is set to the deep temperature setting. If it is the normal setting, the process proceeds to step 120, and it is determined by the switch 101 whether the first freezing room 14 is set to the rapid freezing setting. If not, go to step 115.

Here, while TM1 is not 0, the process proceeds from step 122 to step 116, and further proceeds to 118, so that the first compressor 62 cannot be restarted for 5 minutes after stopping, thereby preventing the first compressor 62 from being overloaded.

By the above operation, the second freezer compartment 15 is controlled to the normal set temperature (−16 ° C. to 24 ° C.) by controlling the first compressor 62 and the blower 20 based on the temperature T2 there.

Next, in step 128, it is determined again whether or not the freezer compartment cooler 18 is being defrosted.
Is determined to be 0, and if not, the blower 19 is operated in step 133. If 0, the process proceeds to step 130, where the first freezer compartment 1
It is determined whether or not 4 is set to the rapid refrigeration. If not, the process proceeds to step 131, and it is determined whether or not the flag 1 is set. In step 132, the temperature T of the first freezer compartment 14 based on the sensor 95
1 and a set temperature G of the first freezer compartment 14 set at any temperature between 16 ° C. and −24 ° C. by the switch 103A.
Performs a comparison operation with. Here, the upper limit temperature and the lower limit temperature are set above and below the set temperature G, and if the temperature T1 rises and becomes equal to or higher than the upper limit temperature, the process proceeds to step 133. If the temperature T1 decreases and becomes lower than the lower limit temperature, the process proceeds to step 135. . If it is higher than the upper limit temperature, the blower 19 is operated in step 133, and if it is lower than the lower limit temperature, the process proceeds to step 135 and the blower 19
To stop.

With the above operation, the first freezer compartment 14 is controlled to the temperature T1 there to control the blower 19 to set the temperature (−16 ° C. to −16 ° C.).
24 ° C).

In this state, when the frozen food is to be stored for a long period of time, the frozen food is stored in the second freezer compartment 15 and the switch 15 is used to set the compartment 15 to a deep temperature. When the second freezer compartment 15 is set at the deep temperature, the microcomputer 94 sets the second temperature set by the switch 103B.
Is set to any temperature between, for example, −24 ° C. and −32 ° C. As a result, the inside of the second freezer compartment 15 has an extremely low freezing temperature, for example, -30 ° C.,
In the room 15, protein deterioration of the frozen food is suppressed, and long-term storage can be achieved. When the second freezer compartment 15 is switched to the deep temperature setting, the process proceeds from step 119 to 121, where
When the first compressor 62 in which the high-temperature refrigerant does not flow through the condensation prevention pipe 68 is stopped, the front surface of the partition wall 13 and the inner surfaces of the doors 2 and 3 are heated by these components. To prevent

Here, when the second freezer compartment 15 is set to a deep temperature, the second freezer compartment 15 is at a very low temperature of −32 ° C., while the first freezer compartment 14 is at a very low temperature.
Is a normal freezing temperature such as -16 ° C. Therefore, the partition wall 13
A temperature difference of as much as −16 ° C. occurs between the left and right sides, whereby the partition wall 13 contracts in the vertical direction. Then inner box 9 or partition wall
A gap is formed at the joint surface with the freezing room 12, from which low-temperature cold air in the second freezing room 15 tends to leak to the first freezing room 14 side. However, the steps 88, 88 have a predetermined width in the vertical direction and are in close contact with the ridges 84, 85 via the seals 87, 87, so that the shrinkage is absorbed, and the seals 87, 87 maintain a hermetic seal. And
Prevent cold air leakage.

Further, when the leakage of the cool air occurs, the temperature in the first freezing compartment 14 tends to decrease, so that the frequency of proceeding from step 132 to step 133 decreases, and the operating rate of the blower 19 decreases. For that reason,
The stirring of the cold air in the first freezing compartment 14 is reduced, and the temperature distribution is high at the upper portion and lower at the lower portion, and the preservability of the food stored in the upper portion is reduced. In particular, there is a problem that the temperature at the upper portion of the inner surface of the door 2 rises abnormally.

However, in the present invention, since the process proceeds from step 129 to step 130, while the count of the freezing room safety timer TM1 is not 0, that is, for 5 minutes after the operation of the first compressor 62 is stopped, the blower 19 is turned on in step 133. Since the forced operation is performed, the cool air in the first freezing compartment 14 is stirred, and even if the cool air leaks, the occurrence of such a temperature distribution is prevented. Also,
Since the forced operation of the blower 19 is performed while the first compressor 62 is stopped, the inside of the first freezing compartment 14 is not overcooled. Furthermore, since the forced operation is performed by using the timer TM1 for protecting the first compressor 62 from overload, it is not necessary to consider a special timer, and the program is simplified.

Next, when a relatively large amount of frozen food is to be stored, or when quick ice making is required, the microcomputer 94 is used as a quick freezing device by the quick freezing switch 101. Thus, the microcomputer 94 sets the set temperature A of the second freezer compartment 15 set by the switch 103B to a sufficiently low set temperature, for example, -50 ° C. for 150 minutes. As a result, the first compressor 62 and the blower 20 become substantially continuously operated, and the process proceeds from step 130 to 133 so that the blower 19 also becomes continuously operated, so that the first freezing compartment 14 is cooled rapidly and rapidly. Freezing and rapid ice making are achieved. Further, during this period, the process proceeds from step 120 to 121, and the electric heaters 91 and 92 are energized, so that dew condensation due to extremely low freezing temperature is similarly prevented.

Next, at step 136 in FIG. 11, it is determined whether or not the freezer compartment cooler 18 is being defrosted. If not, the process proceeds to step 137, where the microcomputer 94 has a total time integration timer TM3 (TM3 It is assumed that, for example, 36 hours are set in advance).
To determine whether TM3 is 0 or not. That is, TM3 accumulates the total time, and if not 0, proceeds to step 139 to determine whether or not the first compressor 62 is operating.
At 0, the operation time accumulation timer TM4 of the microcomputer 94 is decremented (for example, it is assumed that 9 hours and 30 minutes are set in advance in TM4). Then, at step 141, it is determined whether TM4 is 0 or not. to decide. That is, TM4 accumulates the operation time of the first compressor 62, and after 9 hours and 30 minutes have elapsed, proceeds to step 142 to determine whether or not it is currently performing quick freezing. Proceeding to step 144, it is determined whether the low temperature is being set, and if it is set, the flow proceeds to step 143. If none of the above is true, the routine proceeds to step 148, where it is determined whether or not rapid freezing is currently in progress. Next, in step 151, it is determined whether the first compressor 62 is operating. If the first compressor 62 is operating, the process proceeds to step 152, where the microcomputer 94 has a fixed-point control timer TM5 (for example, 30 minutes is set in advance in the TM5). Is subtracted), and then TM5 is set to 0 in step 153.
It is determined whether or not. That is, TM5 accumulates the operation time of the first compressor 62 for 30 minutes, and after 30 minutes, resets the flag 1 in step 154, determines in step 155 whether rapid freezing is in progress, proceeds to step 156, and energizes the electric heater 89. Then, the defrost of the refrigerator 18 is started. If TM3 is not 0 in step 138, the flow proceeds to step 145 to determine whether rapid freezing is in progress. If rapid freezing is in progress, the flow proceeds to step 147. If yes, go to step 147; otherwise, go to step 154.
At step 147, flag 1 is set, and the routine proceeds to step 148.

If not during rapid freezing, but during deep temperature setting, flag 1 is set in step 143, then it is determined in step 148 whether rapid freezing is currently in progress. I do. Thereafter, the same control as described above is executed from step 151 to step 155, the process proceeds to step 156, and defrosting is started as described above.

Therefore, when the temperature is not deep freezing and set at a deep temperature, TM
Flag 1 is set for 30 minutes from the end of the integration of 4, and then defrosting is started. When the flag 1 is set, the process proceeds from step 107 to 109 and 111. In step 111, the temperature T2 of the second freezer compartment 15 based on the sensor 96 and the microcomputer 94
Performs a comparison operation with the set temperature B of the second freezer compartment 15 such as -24 ° C. forcibly set. Here, the upper limit temperature and the lower limit temperature are set above and below the set temperature B, and if the temperature T2 rises and becomes equal to or higher than the upper limit temperature, the process proceeds to step 112. If the temperature T2 decreases and becomes lower than the lower limit temperature, the process proceeds to step 116. Execute control. The process also proceeds from step 131 to step 134, where the temperature T1 of the first freezer compartment 14 based on the sensor 95 and the set temperature E of the first freezer compartment 14 such as −24 ° C. forcibly set by the microcomputer 94 are set. And the same comparison operation as described above. That is, when the freezing is not being performed and the temperature is set to the deep temperature, the two freezing compartments 14 and 15 are turned on for the switches 103A and 103 for 30 minutes before the start of defrosting.
Performs fixed point control at the set temperature of -24 ° C regardless of the operation of 3B.

Here, when the second freezing compartment 15 is set to a deep temperature, the temperature of the freezing compartment cooler 18 is −32 ° C. or less, so that it takes a relatively long time until the defrosting is completed. Therefore, when the defrosting is started as it is, if the setting of the first freezing compartment 14 is -18 ° C. or the like, the temperature T1 of the first freezing compartment 14 rises abnormally during the defrosting, and the freezing of the stored ice cream and the like is performed. Although there is a problem that the food is thawed, in the present invention, as described above, the first freezer compartment 14 is controlled at a fixed point at −24 ° C. for 30 minutes before defrosting, and the temperature is sufficiently lowered, so that such a problem does not occur. This also increases the temperature of the freezer compartment cooler 18, so that the time required for defrosting can be reduced.

According to experiments, when the fixed point control is not performed, the first
When the defrosting is started from a state where the temperature of the load in the freezing compartment 14 is −18.8 ° C., the maximum value of the load temperature at that time is −2.4 ° C.
And the defrosting time was 32 minutes. On the other hand, when the fixed point control is executed as in the present invention, the defrosting is started from the above-mentioned temperature of −23.0 ° C., and the temperature rise at that time was limited to a maximum of −6.6 ° C. Also, the defrosting time was reduced to 30 minutes. At this time,
The maximum value of the temperature of the load in the freezer compartment 15 at the time of defrosting is slightly increased as compared with the case where the fixed point control is not performed, but within a negligible range.

Next, during rapid freezing, even if TM4 becomes 0, the process proceeds from step 148 to step 149, and continues to set TM5 for 30 minutes. Therefore, in step 153, TM5 does not become 0 and flag 1 is not reset. Defrosting is not started. Further, since the process proceeds from step 109 to 110, rapid freezing is continued as it is.

When the rapid freezing is completed, the process proceeds from step 148 to step 150 and from step 109 to step 111, so that the above-mentioned fixed point control for 30 minutes before defrosting is started from this point. During rapid freezing, the temperature of the freezer cooler 18 is −
Since the temperature is 32 ° C. or less, it takes a relatively long time until the defrost is completed.However, since the temperature of the refrigerator 18 for the freezing room is also increased by the fixed point control, the time required for the defrost is also reduced according to the above experimental results. It can be shortened as follows.

Therefore, it is possible to reduce the influence of the heat generated by the electric heater 89 particularly when the amount of food in the freezing compartments 14 and 15 is small, thereby preventing the frozen food from being thawed.

If defrosting is being performed in step 157 in FIG. 12, step 1
Proceeding to 58, the temperature of the freezer cooler 18 based on the sensor 98
TD is compared with the defrosting end temperature C such as + 8 ° C. If the defrosting is completed and the temperature reaches C, the process proceeds to step 159, where the defrosting of the freezer compartment cooler 18 is completed. Set the time, and in step 161 set 9 hours 30 minutes in TM4,
At 162, set 30 minutes to TM5.

Next, the temperature control of the refrigerator compartment 38 will be described with reference to the flowchart of FIG. In step 164, it is determined whether or not the count of TM2 is 0. If the count is 0, the process proceeds to step 166, where the temperature T3 of the refrigerator compartment 38 based on the sensor 97 and the switch 104 are set to 0 ° C.
Refrigeration room 38 set at any temperature between ~ + 7 ° C
A comparison operation similar to that described above with the set temperature F is executed. That is, if T3 rises and becomes equal to or higher than the upper limit temperature, it is determined in step 167 whether or not the second compressor 63 is operating. If stopped, TM2 is set to one minute in step 168, and the second compressor 63 is set in step 169. The compressor 63 and the blower 45 are started. If T3 falls below the lower limit temperature, the routine proceeds from step 166 to step 170, where the second compressor 63 is stopped. Thus, the temperature of the refrigerator compartment 38 is controlled to an arbitrary set temperature within the range of 0 ° C. to + 7 ° C. When the rapid refrigeration switch 102 is operated, the microcomputer 94 changes the set temperature F for 150 minutes from -2 ° C to +5.
Slide into the ° C range to achieve rapid refrigeration. Steps
If TM2 is not 0 at 164, the process proceeds to step 165 to determine whether or not the second compressor 63 is operating. If the second compressor 63 is operating, the process proceeds to step 166. 9th
If TM2 is not 0 also in step 106 in the figure, step 108
Then, it is determined whether the first compressor 62 is operating, and the process proceeds to step 107 only during the operation. That is, for one minute after the start of one of the first and second compressors 62 and 63, the start of the other is prohibited and the accident that the wiring is burned out due to the excessive current flowing by the simultaneous start of both compressors 62 and 63 is prevented. ing.

The air volume from the discharge port 49 is 0 ° C.
It is set so that the ice storage temperature is in the range of 3 ° C. Here, the ice temperature storage temperature is a temperature of 0 ° C. or lower and just before freezing of the food, whereby the food can be stored in the ice greenhouse 41 for a relatively long time without freezing. In particular, since the ice greenhouse 41 is cooled by the refrigerator cooler 44 having a relatively high temperature, it is difficult for the coolroom 41 to be supercooled.

In the embodiment, the present invention is applied to the freezing compartments 14 and 15 which are cooled to a normal freezing temperature and a lower freezing temperature. However, the present invention is not limited to this. It is also effective to apply the present invention to a cooling storage that can be used by switching to the freezing temperature.

Further, in the embodiment, a fan 19,
Although the present invention is not limited to this, the present invention is effective even if the number of blowers is single and the temperature of the first freezing compartment 14 is controlled by adjusting the inflow cool air by a damper.

(G) Effect of the Invention According to the cooling storage device of the first aspect, long-term storage of the stored food is achieved in a state of being cooled to a lower cooling temperature, and the temperature is increased to some extent before the defrost of the cooler. As a result, the defrosting time can be shortened, and it is possible to suppress a rise in the temperature of the food during defrosting particularly when the stored food is small.

In addition, according to the cooling storage according to claim 2, in addition to this, the storage room has two storage rooms, and one storage room is cooled to a lower cooling temperature to achieve long-term storage of the stored food, Since the temperature of the other storage room cooled to the normal cooling temperature can be lowered before the start of defrosting, an abnormal rise in temperature during the defrosting of the other storage room can be prevented.

Further, according to the cooling storage device of the third aspect, even if the partition wall shrinks in a direction extending between the wall surfaces due to a temperature difference between both sides of the partition wall, the step portion closely contacts the jetty in that direction via the sealing material. As a result, the amount of shrinkage can be absorbed, the tightness can be maintained even after shrinkage, and the leakage of cool air can be prevented.

[Brief description of the drawings]

1 is a front view of the cooling storage, FIG. 2 is a front view of the cooling storage excluding a part of the door, and FIGS. 3 and 4 are cross-sectional views taken along lines AA and BB of FIG. 2, respectively. FIG. 5 is a perspective view of a partition wall portion, FIG. 6 is a cross-sectional view taken along line CC of FIG.
FIG. 8 is a perspective view of the outer box, FIG. 8 is an electric circuit diagram of the control device, and FIGS. 9 to 13 are flowcharts showing software of the microcomputer. 1 ... refrigerator, 13 ... partition wall, 14 ... first freezer, 15
…… the second freezer compartment, 18 …… freezer compartment coolers, 19, 20 ……
Blower, 62, first compressor, 84, 85, jetty,
88 ... step, 89 ... electric heater, 93 ... control device.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 61-195279 (JP, U) Japanese Utility Model Showa 63-110869 (JP, U) Japanese Utility Model Showa 49-54159 (JP, U) Japanese Utility Model Showa 49- 54167 (JP, U)

Claims (3)

(57) [Claims] In a cooling storage having a storage room and capable of cooling the storage room to a lower cooling temperature than a normal cooling temperature, defrosting of the cooler is started in a state of cooling to the lower cooling temperature. When the temperature is between the normal cooling temperature and a lower temperature before the start of defrosting, the storage compartment is controlled to be cooled. 2. A cooling storage having a first storage room and a second storage room, wherein one of the storage rooms can be cooled to a lower cooling temperature than a normal cooling temperature, and cooled to the lower cooling temperature. When the defrosting of the cooler is started in the state, before the defrosting is started, the two storage compartments are controlled to be cooled between the normal cooling temperature and a lower cooling temperature. 3. A first storage room and a second storage room are partitioned by a heat insulating partition wall, cool air from a cooler is supplied to both storage rooms for cooling, and one of the storage rooms is cooled. In a cooling storage that can be cooled to a cooling temperature lower than a normal cooling temperature, a pair of jetties are formed opposite to the wall surfaces forming the two storage rooms, and a surface of the partition wall corresponding to the wall surface is formed. A cooling storage, wherein a step portion is formed at one end, and the partition wall is attached between the wall surfaces by bringing the step portion into close contact with the jetty via a sealing material.