JP3176709B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage,
The present invention relates to a storage in which a plurality of storage chambers are formed in a heat-insulating box with a heat conducting member, and the storage chamber is indirectly maintained at a predetermined temperature using a refrigerant or a heat medium.

[0002]

2. Description of the Related Art Conventionally, as this type of storage, a storage applied to a refrigerator is disclosed in Japanese Patent Application Laid-Open No. 63-185359. The refrigerator has two storage chambers formed of a heat conductive member in an insulated box, and is provided with a temperature sensor in one storage chamber, and the temperature is controlled based on a detection result of the one temperature sensor. Has been implemented.

[0003]

The above-mentioned conventional storage has only one temperature sensor, and has a problem in reliability. On the other hand, when a temperature sensor is provided for each storage room, it is not clear how to obtain a plurality of detected temperatures from the temperature sensors and how to maintain the temperature in the storage room of each storage room in an appropriate range. It is clear and the control becomes very complicated.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a storage that can easily control temperature while improving reliability.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, the inside of a heat insulating box is formed into a partition wall of a heat conduction member.
Common cold a plurality of storing chambers for refrigeration formed by more divided
Indirectly holds a predetermined temperature by the retirement unit, before
Refrigeration that allows each storage room to be individually opened and closed with an insulated door
In the storage, the room temperature of each of the storage rooms is detected.
A temperature control means for performing a plurality of temperature sensors, the inside temperature control of the storage chamber based on the detection result of said temperature sensor provided in each storage room to the respective temperature sensor
The normality of the temperature sensor and at least the temperature sensor
Is not normal when the temperature is outside the specified temperature range.
The normality judging means and the temperature sensor for control
When the normality judgment means determines that the condition is not normal,
And a sensor selecting means for changing to the temperature sensor .

[0006]

[0007] The invention of claim 2 is the one according to claim 1
In, the normality determination unit, a timer means for detecting the result of the temperature sensor to measure the duration when a predetermined set temperature range, the temperature when the timer means has measured the predetermined time or more The sensor is provided with a judging means for judging that the sensor is not normal.

[0008] The invention of claim 3 is described in claim 1 or 2.
In the above, the temperature control means is provided with a temperature setting means capable of setting a target temperature corresponding to a selected temperature sensor. The invention of claim 4 is the invention of claim 3
To the ones described, the temperature setting means, is arranged to set by shifting the target temperature after the change in the room temperature side opposite when the temperature sensor is changed by the sensor selecting section.

The invention according to claim 5 is the one according to claim 4
In the above, the temperature setting means sets the target temperature to the normal temperature side for the storage room with high temperature control efficiency, and sets the target temperature to the side opposite to the normal temperature side for the temperature sensor of the storage room with low temperature control efficiency. The target temperature is changed in accordance with the temperature control efficiency of the storage room by shifting.

The invention according to claim 6 is the invention according to claims 1 to 5.
In any one of the above, a circulation fan whose operation can be selected is provided in the storage room, and the sensor selection unit does not select a temperature sensor of the storage room in which the circulation fan is operating. The configuration is provided with a prohibiting means to make it possible.

[0011]

According to the first aspect of the invention, when the temperature control means controls the temperature inside the storage room, the temperature sensors detect the room temperature in each of the plurality of storage rooms. Based on the detection result of any one of the temperature sensors, the temperature control means is caused to execute the internal temperature control. During this time, the normality judging means
Judgment of normality, temperature sensor for control is not normal
If it is determined that the temperature is
Change the sensor. Thereafter, the newly selected temperature
The internal temperature control is executed based on the detection result of the sensor.
You.

[0012]

According to the second aspect of the present invention, the timer means in the normality judging means measures the continuation time when the detection result of the temperature sensor is out of the predetermined set temperature range. When the time has been measured, the determining means determines that the temperature sensor is not normal. Claim
In the invention of the item 3, the target temperature corresponding to the selected temperature sensor can be set by the temperature setting means in the temperature control means.

According to the fourth aspect of the present invention, when the temperature sensor is changed by the sensor selection means, the temperature setting means sets the target temperature after the change to a side opposite to the normal temperature side. That is, the target temperature after the temperature sensor is changed is set to the opposite side to the normal temperature, and lower during cooling.

According to the fifth aspect of the present invention, when setting the target temperature corresponding to the selected temperature sensor, the target temperature is changed in accordance with the temperature control efficiency of the storage room. That is, the target temperature is shifted to the room temperature by the temperature setting means for the storage room having a high temperature control efficiency, and the target temperature is shifted to the side opposite to the room temperature for the temperature sensor of the storage room having the low temperature control efficiency. It is shifted to.

The operation of the invention of claim 6 is as follows.
You. The circulation fan thaws frozen products stored in the storage room
Therefore, when the circulation fan is operating, there is a high possibility that the internal temperature of the storage chamber is out of the desired temperature range. Therefore, in such a case, if the entire temperature control is executed based on the temperature in the storage room, a desired result cannot be obtained, and the prohibiting means does not select the temperature sensor in the storage room. To do.

[0017]

As described above, according to the present invention, the reliability is improved by providing a plurality of temperature sensors, while the temperature control is always executed based on the detection result of one temperature sensor. Can be easier. In addition, since it is determined that an abnormality has occurred in the temperature sensor and the temperature sensor for control is changed, it is possible to always keep the accommodation room within a predetermined temperature range.

According to the third to fifth aspects of the present invention, by appropriately setting the target temperature in accordance with the change of the temperature sensor, it is possible to execute desired temperature control in accordance with the cause of the change in the temperature sensor and the like. . According to the sixth aspect of the present invention, it is possible to prevent an inappropriate storage chamber from being a target and cause an abnormal temperature control when detecting the internal temperature as a reference for temperature control.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the storage is applied to a refrigerator. FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partially cutaway top view. In the figure, the refrigerator main body includes an insulating box 10 and a storage box 20.
The heat insulation box 10 includes the inner wall of the outer box 11 and the inner box 1.
2 is filled with a heat insulating material 13 such as urethane foam, and a pair of left and right openings 14a, 1
4b are formed, and heat insulating doors 15a and 15b for opening and closing the openings 14a and 14b are attached so as to be openable and closable by hinges. In addition, this heat insulating door 1
Sealing members 15a1 and 15b1 are provided between 5a and 15b and the periphery of openings 14a and 14b to insulate them from the outside air.

The storage box 20 is formed of a metal plate material such as stainless steel, which is a heat conductive member, in a housing shape having an opening 21 on one surface.
The openings 14a and 14b of the heat insulating box 10 are fixed to and supported by the outer peripheral edge of the inner surface of the front wall as desired. At this time, the left and right side walls 22, 23, the top wall 24, the bottom wall 25, and the rear wall 26 of the storage box 20 are respectively held at predetermined intervals from the inner wall of the inner box 12 in the heat insulating box 10, and the gap is formed by the air flow. A circulation passage W is formed.

In the storage box 20, a partition wall 27 made of a stainless metal plate material, which is a heat conductive member, is fixed to an upper wall 24 and a bottom wall 25 of the storage box 20 at an upper side and a lower side. The inside of the room RM1 on the right and the room RM2 on the left in the figure
(Thaw box). The two in-compartment fans (circulation fans) 30a and 30b are each configured by fixing a fan 32 to the rotation axis of a fan motor 31 and mounted on the left wall 22 of the storage box 20 in the chamber RM2. . A cover 40 for forming an air flow path is attached to the front surfaces of the in-compartment fans 30a and 30b, and the cover 40 has an exhaust port 41 at a portion facing the fan 32.
Are formed, and a suction port 42 is formed in the lower part. That is, the end of the upper side of the cover 40 is
, The end of the left side bent as an L-shaped cross section is in contact with the left side wall 22 of the storage box, the end of the right side is in contact with the rear wall 26 of the storage box 20, and the lower side is a predetermined gap with the left side wall 22. Are formed to form the above-mentioned suction port 42.

The left side wall 2 of the storage box 20 in the heat insulation box 10
An evaporator 51 of a cooling mechanism 50 for performing cooling by the heat of vaporization of the refrigerant is fixed to a wall portion facing 2 so that its air flow path is directed vertically, and the evaporator 51 and the left side wall 22 of the storage box 20 are fixed to each other. The air circulation holes 6
1 is formed, and a shielding plate 60 in which a blower fan 62 is disposed in the air circulation hole 61 is fixed by its upper piece so as to hang down from the upper wall of the inner box 12 in the heat insulating box 10. A sufficient gap is formed between the lower side of the shielding plate 60 and the lower wall of the inner box 12, and an air cooling flow path communicating from the gap to the upper air flow hole 61 via the air flow path of the evaporator 51. Is formed.

The other components of the cooling mechanism 50, for example, a compressor for compressing the vaporized refrigerant supplied from the evaporator 51 and a condenser for condensing the compressed refrigerant under the air cooling action of the air cooling fan. A dryer that dehumidifies the condensed condensed refrigerant and a capillary tube that converts the dehumidified condensed refrigerant into a low-temperature low-pressure refrigerant and supplies the refrigerant to the evaporator 51 are provided in an auxiliary box 10a formed on the left side of the heat-insulating box 10. It is stored.

In the chambers RM1 and RM2, sensors Th1 and Th2 for detecting respective internal temperatures T1 and T2 are provided, and the sensors Th1 and Th2 are connected to an electric control circuit 70 shown in FIG. ing. The CPU 71 in the electric control circuit 70 detects the detected internal temperatures T1, T
2 to execute temperature control and the like by executing a program corresponding to the flowcharts shown in FIG. The electric control circuit 70 is housed in the auxiliary box 10a. The electric control circuit 70 includes the sensors Th1 and Th2 and door switches Sd1 and Sd2 for detecting the open / closed state of the heat insulating doors 15a and 15b, respectively. , Tm
2 are connected.

The door switches Sd1 and Sd2 are turned on when the heat insulating doors 15a and 15b are opened, and the timers Tm1 and Tm2 are turned on when the door switches Sd1 and Sd2 are turned on. Output time. In addition to the timers Tm1 and Tm2, the in-compartment fans 30a and 30b and the
The selection switch Sw for selecting the operation of the a and 30b and the compressor motor Cm of the cooling mechanism 50 are connected.

Next, the operation of this embodiment having the above configuration will be described. When the main power switch (not shown) is turned on after the refrigerator is installed, the CP in the electric control circuit 70 is turned on.
U71 starts the execution of the main program corresponding to the flowchart shown in FIG. 5, and first executes an initial setting process in step 100. In this initial setting process, the sensor T
setting of a sensor flag SF indicating which one of the detection results of h1 and Th2 is to be used, and whether or not the in-chamber temperatures T1 and T2 of the chambers RM1 and RM2 fall within a predetermined set temperature range and are in a cool state; Is set, and an abnormality flag IF indicating whether the temperature detected by the sensor is abnormal is set. Specifically, the sensor flag SF is set to “sensor Th1”, the cold insulation flag KF is set to a “non-cooled” state immediately after the operation, and the abnormality flag IF is set to “non-cooled”.
Set the "normal" status.

In step 110, the CPU 71 uses the sensors Th1, T
h2 detects the internal temperature T1, T2, and the timer Tm1,
The measured duration of Tm2 and the selected state of the selection switch Sw are input. Then, as for the in-chamber temperatures T1 and T2, those of the sensor indicated by the sensor flag SF are set as the reference temperature value Th0 for storing the reference value in steps 120 to 140. At this time, since the sensor flag SF indicates the sensor Th1, it is determined in step 120 that the sensor Th1 is used, and
At 0, the internal temperature T1 detected by the sensor Th1 is set to a reference temperature value Th0.

In the following step 150, the CPU 71 executes a subroutine for sensor change determination shown in FIG. In the sensor change determination, the CPU 71 determines in step 200 that the heat-insulating door 15 is in accordance with the continuation time of the timers Tm1 and Tm2.
It is determined whether or not the release times of a and 15b are equal to or longer than a predetermined time. That is, since the duration of the timers Tm1 and Tm2 corresponds to the release time of the heat-insulating doors 15a and 15b, if the time for determining that the door is left open is 5 minutes, the duration of one of the timers Tm1 and Tm2 is If it exceeds, judge that the door is left open. In the present embodiment, the timers Tm1 and Tm2 output the duration. However, if the hardware outputs a voltage signal corresponding to the duration, for example, the timers Tm1 and Tm2 correspond to the five minutes. A voltage value may be set, and which voltage value is higher may be determined by comparison.

In step 210, the CPU 71 determines whether the cooling efficiency has fallen below a predetermined value. The change value (Δt / time) per unit time of the reference temperature value Th0 at the start of cooling the inside of the refrigerator should be able to provide a certain standard according to the cooling capacity. However, if the seal members 15a1 and 15b1 are deteriorated and the shut-off with the outside air is not sufficient, even when cooled, the cool air leaks out and the cooling is not sufficient. Then, since the change value becomes smaller than the reference value due to the decrease in the cooling efficiency, the deterioration of the sealing materials 15a1 and 15b1 can be determined.

In step 220, the CPU 71 determines whether the sensor is disconnected or short-circuited according to the reference temperature value Th0. For example, if the value is such that no temperature is detected, for example, “0”, or if it indicates an extremely high temperature value, it can be determined that the wire is broken or short-circuited. Further, the CPU 71 determines in step 230 that FIG.
The subroutine for determining the normality of the detected temperature shown in FIG.
In this detection temperature normality judgment, first, in step 3
At 00, it is determined whether the cold insulation flag KF indicates the “cooled” state or the “non-cooled” state. The determination of the normality of the detected temperature is based on the temperatures T1 and T1 in the chambers RM1 and RM2.
Since it is determined whether or not the temperature detected by the sensor is normal after T2 enters the predetermined temperature range and enters the cold-hold state, it is impossible to determine immediately after the main power is turned on. Accordingly, when the "non-cooling" state is set in the cooling flag KF, the "normal" state is set in the abnormal flag IF in step 320, and this subroutine is terminated.

However, when the chambers RM1 and RM2 are cooled to within the set temperature range, the chambers RM1 and RM2 are controlled by temperature control described later.
As shown in FIG. 8, the internal temperatures of the chambers 1 and RM2 should be maintained between the upper limit set temperature H0 and the lower limit set temperature L0. If it is detected that the temperature has risen above the abnormality determination temperature Hc), it can be determined that the temperature detected by the sensor is abnormal. Therefore, in step 300, the cold insulation flag KF
Is determined to be set to the "cooling" state, the reference temperature value Th0 is compared with the first abnormality determination temperature Hc in step 310, and if it is determined that the reference temperature value Th0 is higher, the process proceeds to step 330. At abnormal flag IF
Is set to "abnormal", and at step 340, the "non-cooling" state is set to the cooling flag KF.

When the subroutine for determining the normality of the detected temperature is completed, it is determined in step 240 in the sensor change determination whether or not the detected temperature is abnormal based on the state of the abnormality flag IF. As described above, it is not determined in step 200 that the door is being left open, the cooling efficiency is not determined to have decreased in step 210, the sensors Th1 and Th2 are not determined to be disconnected or short-circuited in step 220, If it is not determined in step 240 that the detected temperature is abnormal, in step 280, the sensor change flag H
"Unchanged" is set to F, and the subroutine for sensor change determination is terminated.

However, if it is determined that the state is abnormal in any of the above determinations, the sensor is changed by the processing of step 250 and subsequent steps. That is, the CPU 71 determines which of the sensors Th1 and Th2 the currently used sensor is based on the value of the sensor flag SF in step 250, and if the sensor Th1 is used, the CPU 71 determines the sensor Th2 in step 260. Sensor flag SF to use
Is set to "sensor Th2", and "change" is set to the sensor change flag HF. If the sensor Th2 is used, at step 270, the sensor flag SF is set to "sensor Th1" to use the sensor Th1. Is set and "change" is set in the sensor change flag HF.

When the sensor change determination subroutine ends, the CPU 71 determines in step 160 whether the sensor should be changed based on the setting of the sensor change flag HF. If “change” has been set, the process returns to step 110. Then, the reference temperature value Th0 is newly set, and the above-described processing is repeated. However, if “unchanged” is set, the CPU 71 executes the temperature control subroutine shown in FIG.

In this temperature control, the CPU 71 basically sets the reference temperature value Th0 to the upper limit set temperature H in step 400.
It is determined whether or not the temperature exceeds 0, and in step 410, it is determined whether or not the temperature is equal to or lower than the lower limit set temperature L0. If the reference temperature value Th0 exceeds the upper limit set temperature H0, the operation of the compressor motor Cm is started in step 420. If the reference temperature value Th0 is equal to or lower than the lower limit set temperature L0, at step 430 the compressor motor C
Stop the operation of m. According to the above processing, the cooling is started when the temperature in the refrigerator exceeds the upper limit set temperature H0, and the cooling is stopped when the temperature falls below the lower limit set temperature L0. Is held at.

On the other hand, if the operation of the compressor motor Cm is stopped, it can be determined that the internal temperature has entered between the upper limit set temperature H0 and the lower limit set temperature L0. Set the cool state to KF. When the temperature control subroutine ends, the CPU
Reference numeral 71 denotes other processing in step 180, for example, the in-compartment fans 30a and 30 in accordance with the selection state of the selection switch Sw.
The processing for driving b is executed. In-compartment fans 30a, 30
b promotes thawing by circulating cool air in the refrigerator when the frozen mass is stored in the chamber RM2. At this time, since the air in the room RM2 cooled by the frozen mass releases cold heat through the surrounding wall material and the partition wall 27, the inside of the refrigerator is cooled without operating the cooling mechanism 50. Become. After this, CP
U71 returns to step 110 and repeats the above control.

As described above, in this embodiment, only one sensor using the detection result is set in the sensor flag SF, and the detection result of the sensor indicated by the sensor flag SF is set to the reference temperature value. Temperature control is performed as Th0. Therefore, temperature control can be simplified. However, when an abnormality occurs in the sensor or when the inside of the refrigerator is in an inappropriate state for use as a reference for temperature control, another sensor is replaced with the sensor flag S in place of the sensor.
Set to F. Accordingly, the temperature detected by the other sensor is set as the reference temperature value Th0, so that the reliability of the temperature control is improved. In any case, the temperature control is performed based on the detection result of one sensor. So the control is easy.

In the above-described embodiment, when it is determined whether the temperature detected by the sensor is abnormal,
It was determined whether the reference temperature value Th0 was equal to or higher than the first abnormality determination temperature Hc. However, other methods can be used to determine normality. FIG. 10 shows another example of the determination of the normality, and the reference temperature value Th0 is shown.
Determines the normality based on the time that is outside the upper limit set temperature H0 and the lower limit set temperature L0.

In this case, the CPU 71 executes the detected temperature normality judgment corresponding to the flowchart shown in FIG. That is, when it is determined in step 500 that the vehicle is in the cold insulation state based on the cold insulation flag KF, step 5
At 10, it is determined whether or not the reference temperature value Th0 is between the upper limit set temperature H0 and the lower limit set temperature L0. When it is within this range, the counter T0 is determined in step 520.
Is cleared to "0", the "normal" state is set in the abnormality flag IF in step 530, and the process of the normality determination of the detected temperature ends.

However, if the reference temperature value Th0 does not fall between the upper limit set temperature H0 and the lower limit set temperature L0, the CPU 71 increases the value of the counter T0 by "1" at step 540. That is, this counter T0
Is increased by "1" each time the reference temperature value Th0 is out of the predetermined range, and constitutes a software timer. On the other hand, the CPU 71 determines in step 550
Compares the value of the counter T0 with the value of a variable Tc that stores a predetermined constant value. The variable Tc stores a value indicating how long the reference temperature value Th0 deviates from the upper limit set temperature H0 to the lower limit set temperature L0 to determine the sensor detected temperature as abnormal. When the value of the counter T0 has become larger than the value of the variable Tc, the CPU 71 sets the abnormality flag IF to "abnormal" in step 560, and ends the process of determining the normality of the detected temperature.

In the above embodiment, the range between the upper limit set temperature H0 and the lower limit set temperature L0 is not changed at all even if the sensor is changed. However, when the temperature detected by the sensor is inappropriate, the heat insulating doors 15a, 15b
May remain open. In this case,
Since the detection result of the sensor disposed in the room on the open side is not proper, the sensor is changed. However, if the heat-insulating door of one room is left open, not only the room concerned is warmed, but also the other room is easily heated. Therefore, in such a case, when the sensor is changed, the target temperature can be lowered to make it difficult to warm up.

As shown in FIG. 12, an initial first upper limit set temperature H1 and a first lower limit set temperature L1 are determined in advance, and the second upper limit set temperature H2 and the second lower limit set temperature H2, which are lower than these after the sensor change, are set. Two lower limit set temperatures L2 are determined. Then, the upper limit set temperature H0 and the lower limit set temperature L0 are determined by the sensor flag S.
Change according to F. That is, a new change-impossible flag NF is prepared, and the state of “change-possible” is initially set in this change-impossible flag NF. Then, as shown in FIG. 13, in step 122, it is determined which sensor is being used using the sensor flag SF. Since the sensor Th1 is used as the initial setting, step 1
At 32, the internal temperature T1 detected by the sensor Th1 is set to the reference temperature value Th0, and the first upper limit temperature H1 and the first lower limit temperature L1 are set to the upper limit temperature H0 and the lower limit temperature L0. However, when the sensor Th2 is set in the sensor flag SF, the internal temperature T2 detected by the sensor Th2 is set as the reference temperature value Th0 in step 142, and the upper limit set temperature H0 and the lower limit set temperature L are set.
To 0, the second upper limit set temperature H2 and the second lower limit set temperature L2 are set. At the same time, the change impossible flag NF is set to “unchangeable”. Therefore, even if the sensor is changed again, the first upper limit set temperature H1 and the first lower limit set temperature L1 which are higher temperature ranges. Is not set.

In this case, since the refrigerator is a refrigerator, the set temperature is set low so as not to be heated by opening the door, but in the case of a warm storage, the sensor is set so as not to be cooled by opening the door. When changed, increase the set temperature. Further, in the case of the flowchart shown in FIG. 13, regardless of the cooling efficiency of the chamber in which the sensor is disposed,
When the sensor was changed, the set temperature was set lower later. However, in the refrigerator shown in this embodiment, there is a difference in cooling efficiency between the rooms RM1 and RM2. That is, when the air cooled by the evaporator 51 is forcibly circulated by the blower fan 62, it comes into contact with the chamber RM2 first, so that the cooling efficiency of the chamber RM2 is higher.

As a result, during normal operation, the room RM
Since the inside temperature T2 of the room RM2 is lower than the inside temperature T1 of the first case, if this state is to be maintained, the cooling efficiency for each room is taken into consideration and the upper limit set for each room. Set the temperature and the set lower limit temperature. Therefore,
Assuming that the sensor initially used is the sensor Th1 and the sensor used when changing is the sensor Th2, the sensor Th
When using 2, set the temperature lower. Conversely, assuming that the sensor initially used is the sensor Th2 and the sensor used when changing is the sensor Th1, the sensor Th1
When using, set the temperature higher.

By operating the selection switch Sw, the in-compartment fans 30a and 30b of the chamber RM2 can be operated to promote thawing. Normally, when thawing is performed in this manner, the inside temperature T2 of the chamber RM2 is used.
Drops sharply. Therefore, when the sensor is changed during thawing and the sensor arranged in the thawing room is used, even if the temperature inside the other room becomes high, only the temperature inside the thawing room is low, so the cooling mechanism 50 will not work.

Accordingly, the selection switch Sw is set to the internal fan 3
0a, 30b when the operation is instructed, the sensor Th
2 must not be used. In the flowchart shown in FIG. 14, the sensor Th2 is used only when the sensor Th2 is set in the sensor flag SF under the condition that the selection switch Sw has not selected the operation state in step 124. I have to.

In each of the embodiments described above, the case of a refrigerator having two storage rooms has been described. However, the present invention can be applied to a refrigerator having more storage rooms. In this case, a variable indicating a sensor may be used instead of the sensor flag SF.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator to which a storage according to an embodiment of the present invention is applied.

FIG. 2 is a partially cutaway front view of the refrigerator.

FIG. 3 is a partially cutaway top view of the refrigerator.

FIG. 4 is a block diagram showing a control system in the refrigerator.

FIG. 5 is a flowchart of a control program executed by a CPU.

FIG. 6 is a flowchart of a sensor change determination process.

FIG. 7 is a flowchart of a process of determining a normality of a detected temperature.

FIG. 8 is a diagram showing a change in the temperature inside the refrigerator which is temperature-controlled.

FIG. 9 is a flowchart of a temperature control process.

FIG. 10 is a diagram showing a change in the internal temperature of the refrigerator under temperature control.

FIG. 11 is a flowchart of a process of determining a normality of a detected temperature.

FIG. 12 is a diagram showing a change in the temperature inside the refrigerator which is temperature-controlled.

FIG. 13 is a flowchart of a control program.

FIG. 14 is a flowchart of a control program.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Insulated box 20 ... Storage box 30a, 30b ... Internal fan 50 ... Cooling mechanism 70 ... Electric control circuit 71 ... CPU H0 ... Upper limit set temperature H1 ... First upper limit set temperature H2 ... Second upper limit set temperature Hc ... First Abnormality judgment temperature L0 ... Lower limit set temperature L1 ... First lower limit set temperature L2 ... Second lower limit set temperature RM1, RM2 ... Room Sw ... Selection switch T0 ... Counter T1, T2 ... Inside chamber temperature Th0 ... Reference temperature value Th1, Th2 ... Sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F25D 17/08 311 F25D 11/02 F25D 29/00

Claims (6)

(57) [Claims] 1. The inside of a heat insulating box is divided by a partition wall of a heat conductive member.
A plurality of storage chambers for refrigeration formed by a common cooling device
Thus indirectly holds a predetermined temperature, each housing
Refrigerator that can open and close rooms individually with insulated doors
Te, each of the storage chambers to detect the room temperature of each storage room, respectively
A plurality of temperature sensors provided for each of the temperature sensors; temperature control means for controlling the temperature inside the storage chamber based on the detection results of the temperature sensors; and determining whether each of the temperature sensors is normal.
When the sensor detection result is out of the specified temperature range
The normality judging means for judging that it is not normal and the temperature sensor for control are not normal by this normality judging means.
Change to another temperature sensor when it is judged
And a sensor selecting means.
Warehouse. 2. The refrigerator according to claim 1, wherein
The normality determining means determines that the detection result of the temperature sensor is a predetermined value.
To measure the duration when the temperature is out of the set temperature range.
The timer means and this timer means measured a predetermined time or more.
Determination means that sometimes determines that the temperature sensor is not normal
And a refrigerator comprising: 3. A refrigerator according to claim 1 or claim 2.
In the above, the temperature control means may be a selected temperature sensor.
Temperature setting means that can set the target temperature corresponding to
A refrigerator characterized by comprising. 4. The refrigerator according to claim 3, wherein
The temperature setting means is a temperature sensor by the sensor selection means.
When the target temperature is changed, the target temperature after the change
Characterized in that it is configured to be shifted to
Warehouse. 5. The refrigerator according to claim 4, wherein
The temperature setting means is used for storage rooms with high temperature control efficiency.
Is the temperature of the storage room where the temperature control efficiency is low,
For the temperature sensor, shift the target temperature to the side opposite to the normal temperature side.
Change to the target temperature according to the temperature control efficiency of the storage room.
A refrigerator characterized by being configured to give. 6. The method according to claim 1, wherein
3. The refrigerator according to claim 1, wherein the storage room can be operated.
Circulating fan, and select the sensor
Means for determining the temperature of the storage chamber in which the circulation fan is operating;
Prohibit means to prevent the sensor from being selected
A refrigerator characterized in that: