JPH1144475A - Temperature control unit for cold storage chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the direct recognition of the highest temperature or the lowest temperature of target temperature in the past in the temperature control unit of a cold storage chamber and to structure it at low cost. SOLUTION: The inside temperature of the accommodating compartment of each of chambers A or B is continuously detected by controlling temperature sensor 15 and current temperature data are stored into the memory of each of chamber control circuits 40 continuously. The highest and the lowest temperature out of the detected inside temperature of the accommodating compartments are kept on detected and stored unto each of the memories of the controlling circuit 40 as the highest temperature data and the lowest temperature data. A display controlling circuit 50 stores each of the temperature data stored in the memories of each of the chamber controlling circuits 40 refreshingly in a memories 50a and 50b corresponding to each of the chambers A and B of the display controlling circuit 50 and according to the on or off state of the highest and the lowest temperature displaying switch 32, each of displaying temperature of the stored temperature data is displayed by the display 31a and 31b selectively corresponding to each of the chambers A and B of the panel 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a low-temperature storage for storing foods in a low-temperature state, and controls the temperature in the storage room of the low-temperature storage or the core temperature of the food stored in the storage room. Regarding the management device.

[0002]

2. Description of the Related Art Conventionally, as an apparatus of this type, there has been an apparatus which displays a past history of temperatures to be managed in a graphic manner as disclosed in, for example, Japanese Utility Model Publication No. 1-410109.

[0003]

However, in the above-mentioned conventional apparatus, there is a problem that it is not possible to directly recognize the highest temperature or the lowest temperature in the past of the temperatures to be managed. In addition, there is another problem that the cost of the display is increased to display the graphic.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and has as its object to be able to directly recognize the highest and lowest temperatures of a target temperature over the past and to be able to construct it inexpensively. Another object of the present invention is to provide a temperature control device for a low-temperature storage as described above.

In order to solve the above-mentioned problem, the present invention is characterized in that a temperature detecting means for detecting a temperature to be managed and a temperature detecting means for detecting the temperature within a predetermined time from the present to the present. A maximum / minimum temperature detecting means for detecting at least one of the maximum temperature and the minimum temperature, and a temperature detected by the temperature detecting means or a maximum temperature or a minimum temperature detected by the maximum / minimum temperature detecting means are displayed. Control means for selectively displaying the temperature detected by the temperature detecting means and the maximum temperature or the minimum temperature detected by the maximum and minimum temperature detecting means on the display. Has been established.

Another feature of the configuration of the present invention is that, in addition to the above configuration, a start instruction switch for instructing the start of monitoring of the temperature to be managed is provided, The present invention is configured to detect at least one of the highest temperature and the lowest temperature from the temperatures detected after the start instruction by the start instruction switch.

In each of the above structures, the display control means includes:
Display designation means for designating display contents on the display, and a temperature detected by the temperature detection means and a maximum temperature or a minimum temperature detected by the maximum / minimum temperature detection means in accordance with the designation by the display designation means. The display switching means for selectively displaying the information on a display may be used.
In this case, the display designating means is constituted by a display instruction switch that switches between an on state and an off state, and the display switching means displays the temperature detected by the temperature detecting means when the display instruction switch is in the off state on a display. In addition, when the display instruction switch is in the ON state, at least one of the maximum temperature and the minimum temperature detected by the maximum and minimum temperature detection means may be displayed on the display.

Another structural feature of the present invention is that the same temperature detecting means as described above and the maximum and minimum temperatures among the temperatures detected by the temperature detecting means after a predetermined time in the past. It has a maximum and minimum temperature detecting means for detecting at least one of them, and a display for displaying the temperature detected by the temperature detecting means or the maximum or minimum temperature detected by the maximum and minimum temperature detecting means, respectively. And a display instruction switch for instructing display contents on the display, and displaying the temperature detected by the temperature detecting means when the display instruction switch is in an off state on the display. When in the ON state, at least one of the maximum temperature and the minimum temperature detected by the maximum and minimum temperature detecting means is detected. In the provision of the display switching means for displaying the serial display.

Another structural feature of the present invention is that, in the above-described configuration, the maximum and minimum temperature detecting means is configured to detect the maximum and minimum temperatures from the temperatures detected by the temperature detecting means after a predetermined time in the past. The display switching means causes the display to display the temperature detected by the temperature detecting means when the display instruction switch is off, and detects the maximum and minimum temperatures when the display instruction switch is on. The maximum temperature and the minimum temperature detected by the means are alternately displayed on the display every predetermined time.

[0010] In the temperature management device having the above-described configuration, the present temperature of the temperature to be managed and the highest temperature or the lowest temperature over the past are selectively displayed on the display. Therefore, the maximum temperature or the minimum temperature can be directly recognized, and the temperature management device can be configured at low cost.

Another feature of the present invention is a temperature control device applied to a low-temperature storage that stores food in a storage room at a low temperature during normal operation and intermittently executes a defrost operation. A temperature detecting means similar to the above, and a maximum / minimum temperature detecting means for detecting at least one of the highest temperature and the lowest temperature from the temperatures detected by the temperature detecting means after a predetermined time in the past;
A temperature control device comprising a temperature detected by the temperature detection means, or an indicator for displaying the maximum temperature or the minimum temperature detected by the maximum / minimum temperature detection means, respectively, during normal operation of the low-temperature storage. Selectively displays on the display the temperature detected by the temperature detecting means and the maximum temperature or the minimum temperature detected by the maximum and minimum temperature detecting means, and during the defrost operation of the low-temperature storage, And a display control means for selectively displaying on the display a display indicating the above and the maximum temperature or the minimum temperature detected by the maximum and minimum temperature detection means. In this case, the maximum and minimum temperature detection means detects at least one of the maximum and minimum temperatures from the temperatures detected by the temperature detection means during normal operation of the low-temperature storage after a predetermined time in the past. It is good to

In the temperature management device having the above-described configuration, during the normal operation of the low-temperature storage, the current temperature of the temperature to be managed and the maximum temperature and the minimum temperature over the past are selectively displayed on the display. . Therefore, the maximum temperature or the minimum temperature can be directly recognized, and the temperature management device can be configured at low cost. Further, during the defrost operation of the low-temperature storage, a display indicating that the same defrost operation is being performed is displayed instead of the current temperature, so that the operating state of the low-temperature storage can be recognized.

Another structural feature of the present invention is a temperature control device applied to a low-temperature storage similar to the above, wherein the same temperature detecting means as described above, and monitoring of a temperature to be managed are started. Start instructing means for instructing at least one of the highest temperature and the lowest temperature from the temperatures detected during the normal operation of the low-temperature storage after the start instruction by the start instructing means. The lowest temperature detecting means, the highest and lowest temperature storing means for storing the highest temperature or the lowest temperature detected by the highest and lowest temperature detecting means, and the temperature detected by the temperature detecting means or the highest and lowest temperature storing means, respectively. In a temperature control device provided with an indicator for displaying the highest temperature or the lowest temperature, the temperature detected by the temperature detecting means and the highest Display control means for selectively displaying the highest temperature or the lowest temperature stored by the temperature storage means on a display, and defrost for storing the temperature detected by the temperature detection means when the low-temperature storage starts defrost operation. A start storage unit for updating the temperature stored in the maximum / minimum temperature storage unit with the temperature stored in the defrost start storage unit when a start instruction is issued by the start instruction unit during the defrost operation of the low-temperature storage; Means. In this case, the start instructing means is constituted by a start instructing switch or a time measuring means for measuring time, and an instructing means for instructing to start monitoring a temperature to be managed each time the time measuring means measures a predetermined time. It is better to configure.

In the temperature management apparatus having the above-mentioned configuration, the current temperature of the temperature to be managed and the maximum temperature or the minimum temperature during the normal operation of the low-temperature storage after the start instruction by the start instruction means are displayed on the display. Is displayed selectively. Therefore, the maximum temperature or the minimum temperature can be directly recognized, and the temperature management device can be configured at low cost.
When a start instruction is given by the start instruction means during the defrost operation of the low-temperature storage, the temperature to be managed at the start of the defrost operation is displayed on the display as the maximum temperature or the minimum temperature. Therefore, since the display of the highest temperature or the lowest temperature can be always displayed on the display without interruption, the usability of the temperature management device is improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

a. First Embodiment First, a first embodiment of the present invention will be described. In this embodiment, the highest temperature and the lowest temperature of a temperature to be managed over a predetermined time in the past are displayed.

FIG. 1 is a sectional view showing a refrigerator-freezer to which the embodiment is applied. This refrigerator-freezer has a freezer section A as a low-temperature storage, which is similarly configured by a housing 10 formed in a rectangular shape with a heat insulating material or the like.
And a refrigerator section B. Each of the storages A and B formed inside the housing 10 is partitioned into a storage chamber 12 and a cooling chamber 13 by a partition plate 11, respectively. Ingredients F carried in from a door (not shown) on the upper side of the paper in FIG. 1)
Are stored on shelves 14 or the like. In addition, a management temperature sensor 15 for detecting the temperature in the accommodation room 12 to be managed by the temperature management device is attached to the upper part of the accommodation room 12 and the lower surface of the partition 11.

An evaporator 16 is mounted on the partition plate 11. The evaporator 16 cools the air in the cooling chamber 13 by supplying the refrigerant that is pressure-fed by the compressor 17 and condensed by the condenser 18. The supplied refrigerant is returned to the compressor 17 again. A defrost heater 19 for melting the attached frost and a defrost temperature sensor 21 for detecting the temperature of the evaporator 16 are attached to the evaporator 16. Inside the cooling chamber 13, an in-compartment cooling fan 22 is also provided. The in-compartment cooling fan 22 sucks the lower air in the storage chamber 12 from the gap 11 a provided in the partition 11 into the cooling chamber 13 and circulates the cool air in the cooling chamber 13.

This refrigerator-freezer has a housing 10
A panel 30 (shown only in FIG. 2) operated by a user. The panel 30 includes a pair of indicators 31a and 31b and a maximum and minimum temperature display switch 32.
(Display instruction switch) and a start instruction switch 33. The indicators 31a and 31b are provided corresponding to the freezer section A and the refrigerator section B, respectively, and selectively display the current temperature in the storage room 12 of each of the refrigerators A and B, and the highest temperature and the lowest temperature over the past. It is a numeric display for displaying. The maximum and minimum temperature display switches 32
This is a normally open switch for instructing a and 31b to display the maximum and minimum temperatures. Start instruction switch 3
Reference numeral 3 denotes a normally open switch for disabling the maximum temperature and the minimum temperature and newly starting the measurement of the maximum temperature and the minimum temperature.

Next, the electric control unit of the refrigerator will be described. The refrigerator has a refrigerator control circuit 40 connected to each of the temperature sensors 15 and 21, the compressor 17, the defrost heater 19 and the cooling fan 22 in the refrigerator for each of the refrigerators A and B. Each storage control circuit 40 is constituted by a microcomputer and executes a program corresponding to the flowcharts shown in FIGS. 7 to 11, and each of the temperature sensors 15 and 2 for each of the storages A and B.
Based on the detection by the control unit 1, the operation of the compressor 17, the defrost heater 19, and the cooling fan 22 in the refrigerator is controlled, and the present temperature in the accommodation room 12 and the highest temperature and the lowest temperature over the past are detected.

Each warehouse control circuit 40, as shown in FIG.
A memory 40a, a sampling timer 40b for measuring time, a temperature management timer 40c, a defrost cycle timer 40d, a heating timer 40e, a draining timer 40f,
Fan delay timer 40g and defrost invalidation timer 40
h. As shown in detail in FIG. 5, the memory 40a includes first and second detected temperature data S1 and S2, current temperature data K, maximum temperature data Kmax, minimum temperature data Kmin, defrost start temperature data K ', and history temperature. Each has an area for storing data K1 to Kn. First and second detected temperature data S1, S2
Represents the temperature detected by the management temperature sensor 15, respectively. The current temperature data K represents the current temperature in the accommodation room 12 detected based on both the detected temperature data S1 and S2. Maximum temperature data Kmax
And the minimum temperature data Kmin respectively represent the highest temperature and the lowest temperature in the accommodation room 12 over the past.
Each of the historical temperature data K1 to Kn includes first to nth temperature data representing a temperature in the accommodation room 12 in the past, and represents a temperature history in the accommodation room 12 over a predetermined time in the past. The value n is a large positive integer. Further, each of the cabinet control circuits 40 is also connected to the start instruction switch 33 of the panel 30.

The refrigerator-freezer also includes the above-mentioned refrigerator control circuits 40 and a display control circuit 50 connected to the indicators 31a and 31b and the switches 32 and 33 of the panel 30. The display control circuit 50 is configured by a microcomputer, and by executing a program (not shown),
The display on the displays 31a and 31b of the panel 30 is controlled. The display control circuit 50 includes a pair of memories 50a, 50
b. The memories 50a and 50b are provided corresponding to the freezer section A and the refrigerator section B, respectively, and as shown in detail in FIG. 6, areas for storing current temperature data K, maximum temperature data Kmax, and minimum temperature data Kmin. have.

Next, the operation of the refrigerator-freezer constructed as described above will be described. When a power switch (not shown) is turned on, each storage control circuit 40 starts execution of the main program in FIG. 7 and starts control processing for each of the corresponding storages A and B. After starting the execution of the main program in step 100, the storage control circuit 40 first executes a start process in step 102. In this start process, the flag FLG1, FLG2, the number of data DN, and the data designation variable DP are each set to the value “0”, and the temperature detected by the control temperature sensor 15 at that time is set as the first detected temperature data S1 in the memory 40a. And a reset start of the sampling timer 40b, the temperature management timer 40c, and the defrost cycle timer 40d to start the time counting. The flag FLG1 indicates that the freezer section A or the refrigerator section B is in normal operation at a value "0", and the freezer section A or the refrigerator section B has a defrost value at a value "1" to "3", respectively. This indicates that the vehicle is in each step of the operation. The flag FLG2 is
A value of "1" indicates that the freezer section A or the refrigerator section B is in a state shortly after the end of the defrost operation. The data number DN indicates the number of pieces of history temperature data stored in the memory 40a. The data designation variable DP represents the number of the history temperature data to be stored next in the memory 30a.

After the start processing, the flags FLG1 and FLG2 remain set to the value "0" until the defrost cycle timer 40d, which has been reset-started in the start processing, measures a defrost cycle (for example, 6 hours). Therefore, based on the determination of “YES” in steps 104 and 107 and “NO” in step 108,
The warehouse control circuit 40 repeatedly executes the circulation processing of steps 104 to 110. During the circulation process, in step 106, a normal operation control process is executed. The normal operation control process is performed based on the detection by the management temperature sensor 15 when the temperature in the storage room 12 becomes higher than a predetermined upper limit temperature until the temperature in the storage room 12 reaches the predetermined lower limit temperature. This is a process of operating the compressor 17 and the internal cooling fan 22 to cool the air in the storage chamber 12.
However, the compressor 17 and the internal cooling fan 22
Is not executed while stopping the progress of the program, but is executed at any time during the circulation processing.
As a result, during the circulation process, the temperature in the storage chamber 12 is maintained between the predetermined upper limit temperature and the lower limit temperature. The upper limit temperature and the lower limit temperature are previously set independently for each of the refrigerators A and B.

Further, during the above-mentioned circulation processing, in step 110, a temperature management processing shown in detail in FIG. 8 is executed. This temperature management process is a process of detecting the current temperature in the accommodation room 12 and the maximum temperature and the minimum temperature over the past predetermined time based on the detection temperature of the management temperature sensor 15.

After the execution of the temperature management processing in step 200, the storage control circuit 40 first executes step 202.
, A current temperature detection process shown in detail in FIG. 9 is executed.
Each time the execution of the present temperature detection process is started in step 300, the storage control circuit 40 sets the flag FLG1, FLG
If 2 is set to the value "0", based on the determination of "YES" in step 302, whether the time counted by the sampling timer 40b has reached the sampling period (for example, 62 milliseconds) in step 304 Determine whether or not. If the timer 40b has not counted the above-mentioned sampling period at this time, the determination is "NO", and the execution of the present temperature detection process is temporarily terminated at step 318. On the other hand, if the timer 40b is counting the sampling period at this time, it is determined to be "YES" and the processing consisting of steps 306 to 314 is executed, and the first and second detection temperatures stored in the memory 40a are executed. Data S1, S2
And the current temperature data K is updated.

In this case, the storage control circuit 40 firstly sets the temperature represented by the first detected temperature data S1 to the second
After storing as the detected temperature data S2, Step 308
The temperature detected by the control temperature sensor 15 is stored as first detected temperature data S1, and each detected temperature data S
In step 312, the average value of the two temperatures is stored as the current temperature data K on condition that the difference between the temperatures 1 and S2 is within the allowable change temperature (for example, 1 ° C.). Then, after each of the processes, the sampling timer 40b is reset and started again at step 314 to start timekeeping, and then at step 318, the execution of the current temperature detection process is temporarily terminated.

By repeatedly executing the current temperature detection processing as described above, the first detected temperature data S1 is updated to the temperature data representing the temperature detected by the control temperature sensor 15 at that time, and 2
The detected temperature data S2 is updated to temperature data representing the temperature detected by the control temperature sensor 15 last time and stored as the first detected temperature data S1, and the average value of the temperatures represented by the first and second detected temperature data S1 and S2. Is detected as the temperature in the accommodation room 12 at that time, and is updated and stored as the current temperature data K. Thereby, the appropriate temperature in the accommodation room 12 in which the variation is suppressed is constantly detected. Further, the detection of the temperature in the storage chamber 12 is prohibited when the difference between the temperatures represented by the two detected temperature data S1 and S2 is greater than the allowable change temperature. Is included, it is avoided that the temperature in the storage chamber 12 is detected based on the detected temperature including the error, and the accurate temperature in the storage chamber 12 is always detected.

After the end of the current temperature detection processing, the storage control circuit 40 determines in step 206 that the reset start in step 102 has been performed on condition that the start instruction switch 33 of the panel 30 has not been turned on. It is determined whether or not the count of the management timer 40c has reached a time T / n obtained by dividing a predetermined time T (for example, 0 to 48 hours) by n. At this time, the temperature management timer 40c sets the time T.
If / n has not been counted, the program proceeds to step 226 based on the determination of "NO", and the execution of the temperature management process is temporarily terminated. On the other hand, if the temperature management timer 40c is measuring the time T / n at this time, it is determined to be “YES” and the processing consisting of steps 208 to 222 is executed.

In this case, the warehouse control circuit 40 executes step 2
After adding the value “1” to the data specification variable DP at 08,
If the added data designation variable DP does not exceed the value n which is the number of the largest historical temperature data, step 2
The program is determined to be "NO" at step 10 and the program is executed at step 21.
The process proceeds to step S4, and the current temperature in the storage room 12 stored as the current temperature data K is stored in the memory 40a as the historical temperature data KDP specified by the added data specifying variable DP. Then, after the same storage, the number of data DN
Does not reach the value n, the value "1" is added to the same data number DN in step 218 based on the determination of "YES" in step 216.

After the above processes, in step 220, a maximum and minimum temperature detection process shown in detail in FIG. 10 is executed. The storage control circuit 40 starts the execution of the maximum and minimum temperature detection processing in step 400,
The temperature represented by the second historical temperature data K1 is stored in the memory 40 as the maximum temperature data Kmax and the minimum temperature data Kmin.
a, and after setting the data designating variable i to the value “1” in step 404,
2 is repeatedly executed.

During the circulating process, the warehouse control circuit 40 increases the value of the data designated variable i by "1" at step 406, and increases the temperature represented by the historical temperature data Ki designated by the designated variable i. Is the maximum temperature data Km
whether the temperature is higher than ax and the minimum temperature data Km
In step 4 it is determined whether the temperature is lower than
The determination is made sequentially at 14, 420. If the temperature represented by the historical temperature data Ki is higher than the temperature represented by the maximum temperature data Kmax, the memory 4
The maximum temperature data Kmax stored in 0a is updated with the historical temperature data Ki. On the other hand, the same history temperature data K
If the temperature represented by i is lower than the temperature represented by the minimum temperature data Kmin, in step 422, the minimum temperature data Kmin stored in the memory 40a is updated with the same historical temperature data Ki. However, if the historical temperature data Ki has been set to the invalid value “E” by the processing described later, the comparison determination processing in steps 414 and 420 is avoided based on the determination in step 410. Also,
If the first history temperature data K1 is set to the invalid value “E” and the maximum temperature data Kmax and the minimum temperature data Kmin are set to the invalid value “E” by the process of step 402, respectively Step 41
Based on the judgment at 2,418,
The temperature data Kmax and Kmin are updated with the historical temperature data Ki specified by the specified variable i without going through the comparison determination process of 4,420.

The circulation processing consisting of steps 406 to 422 is continued until the data designating variable i exceeds the number of data DN based on the judgment in the judgment processing in step 408. Therefore, as a result of the cyclic processing, the memory 4
Of all the historical temperature data stored in 0a, the data having the invalid value "E" is removed, and the data having the highest temperature is stored in the memory 40a as the maximum temperature data Kmax. , The lowest one is stored in the memory 40a as the lowest temperature data Kmin.
After the completion of the circulation processing, if the temperature data Kmax and Kmin are not invalid values “E”, the warehouse control circuit 40 proceeds to step 4
23 is determined to be "NO", and in step 426, the execution of the maximum / minimum temperature detection processing is temporarily ended.

After the maximum / minimum temperature detection processing, the storage control circuit 40 returns to the temperature management timer 40c in step 222.
Is reset and the time measurement is started, and in step 226, the execution of the temperature management process is temporarily ended. By repeatedly executing such temperature management processing, the temperature in the storage chamber 12 is detected at each sampling cycle during the circulation processing of steps 104 to 110 in FIG. Time T / n
Each time, the temperature in the accommodation room 12 detected at that time is newly stored in the memory 40a as history temperature data in order from the first, and the newly stored history temperature data is included. , The maximum temperature data Kmax and the minimum temperature data Kmin are newly selected from all the historical temperature data stored in the memory 40a, and the respective temperature data Kmax and Kmin stored in the memory 40a are continuously updated.

During the above-described repetition, a predetermined time T has elapsed from the start of the operation of the refrigerator-freezer or the on-operation of the start instruction switch 33 of the panel 30, which will be described later.
N historical temperature data K1 to Kn from the nth to the nth
Is stored, the next time the process of step 208 is executed, the value of the data designation variable DP becomes “n + 1” and exceeds the value “n”. In this case, the warehouse control circuit 40 sets the data designation variable DP to the value “1” in step 212 based on the determination of “YES” in step 210. Thereby, hereafter, in step 214,
The temperature in the storage chamber 12 is stored in the memory 40a again as history temperature data in order from the first temperature again. That is, among the historical temperature data K1 to Kn already stored in the memory 40a, the stored temperature is updated to a new temperature in order from the oldest one. Therefore, the memory 40a stores n pieces of historical temperature data K1 to Kn.
Accordingly, the temperature in the storage chamber 12 over the past predetermined time T is always stored and maintained.

If the first to n-th historical temperature data K1 to Kn are stored in the memory 40a and the number of data DN reaches the value "n" as described above, the process proceeds to step 216. Based on the determination of "NO", the storage control circuit 40 avoids the addition process of step 218. As a result, thereafter, the data number DN is kept at the value “n”, and the historical temperature data checked in the maximum / minimum temperature detection processing of the step 220 is kept at n pieces from the first to the nth. n historical temperature data K1 to K
The maximum temperature data Kmax and the minimum temperature data Kmin are selected from n and stored in the memory 40a. In this case, since the n pieces of historical temperature data K1 to Kn represent the temperature in the accommodation room 12 over the past predetermined time T as described above, the maximum temperature data Kmax and the minimum temperature data Kmin are also the same predetermined time. It goes to T.

On the other hand, if the start instruction switch 33 of the panel 30 is turned on during the above-described repetition, the storage control circuit 40 determines the number of data at step 224 based on the determination of “YES” at step 204. The value of both DN and the data designation variable DP are set to “0”. As a result, the history temperature data starts to be stored again in the memory 40a from the first again, and the highest temperature among the history temperature data newly started to be stored from the first in the maximum / minimum temperature detection processing in step 220. The data Kmax and the minimum temperature data Kmin are selected and stored.

Next, the operation of this refrigerator-freezer during the defrost operation will be described. When the time of the defrost cycle timer 40d reaches the defrost cycle during the circulation processing of steps 104 to 110 in FIG. 7 described above, each storage control circuit 40 executes the program based on the determination of “YES” in step 108. Proceeding to step 112 and thereafter, the freezer section A or the refrigerator section B starts the defrost operation.
In step 112, the compressor 17 and the internal cooling fan 22 are stopped, and the defrost heater 19 is operated. In step 114,
The heating timer 40e is reset and started to measure time. In step 116, the flag FLG1 is set to a value “1”. In step 117, the temperature in the storage chamber 12 which is not yet affected by the defrost operation at that time, which is represented by the current temperature data K, is stored in the memory 40a as the defrost start temperature K '.

The flag FLG in the above step 116
According to the setting of 1, the storage control circuit 40 thereafter executes step 1
Based on the determination of “NO” in step 04, step 10
The circulation processing of 4, 118, 110 is repeatedly executed. During the circulation process, in step 118, FIG.
The defrost operation control process described in detail in FIG. 1 is executed.

First, while the flag FLG1 is at the value "1", the storage control circuit 40 executes the steps 500 to 506 each time this defrost operation control processing is executed, based on the determination of "YES" in the step 502. , 536 are repeatedly executed. During the repetitive execution, step 1 in FIG.
By the operation of the defrost heater 19 started at 12, the evaporator 16 is continuously heated, and the frost attached to the evaporator 16 is melted. Then, when the temperature of the evaporator 16 rises and the temperature detected by the defrost temperature sensor 21 becomes higher than a predetermined heating end temperature, or in step 1 in FIG.
When the heating timer 40e, which has been reset-started at 14, has counted a predetermined heating end time, the storage control circuit 40
Based on the determination in step 504 or 506, the operation of the defrost heater 19 is stopped in step 508, and the heating of the evaporator 16 is terminated.
At 0, the draining timer 40f is reset-started to start timing, and at step 512, the flag FLG
Set 1 to value "2".

The flag FLG in the above step 512
By setting the value of “1” to “2”, the storage control circuit 40
Each time the defrost operation control process is executed, the steps 500 and 50 are performed based on the determination of “NO” in step 502 and “YES” in step 514.
2, 514, 516 and 536 are repeatedly executed.
During the repetitive execution, the frost-melted water adhering to the evaporator 16 is discharged to the outside of the refrigerator-freezer via a water passage (not shown). When the draining timer 40f, which has been reset-started in step 510, measures a predetermined draining end time, the storage control circuit 40 proceeds to step 51.
Based on the determination in step 6, the operation of the compressor 17 is started in step 518, the fan delay timer 40g is reset-started in step 520, and time measurement is started. In step 522, the flag FLG1 is set to the value “3”. Set to.

The flag FLG in the above step 522
By setting the value of 1 to "3", the storage control circuit 40
Repeats the processing of steps 500, 502, 514, 524, 536 each time the defrost operation control processing is executed, based on the determination of "NO" in steps 502, 514. During the repetitive execution, the above step 51
By the operation of the compressor 17 started in 8, the air in the cooling chamber 13 is cooled. Then, the above step 5
Fan delay timer 40 that has been reset and started at 20
When g counts the predetermined fan delay time, the warehouse control circuit 40 starts the operation of the cooling fan 22 in the warehouse in step 526 based on the determination in step 524, and again starts the defrost cycle timer in step 528. At time 530, the flag FLG1 is set to a value "0", and the defrost operation is terminated. At this time, the defrost invalidation timer 40h is reset-started in step 532 to start timing, and in step 534, the flag FLG2 is set to the freezer section A or the refrigerator section B.
Is set to a value “1” indicating that the state is shortly after the end of the defrost operation.

The flag FLG at the step 530
Setting the value of 1 to “0” and F in step 534
By setting the value of LG2 to “1”, the warehouse control circuit 40
Thereafter, in the main program of FIG.
4 and “N” in step 107.
O ”, steps 104 to 107 and 12
The cyclic processing of 0, 108, 110 is repeatedly executed. At this time, in step 106, the normal operation process is repeatedly executed again, and the temperature in the storage chamber 12 is again controlled between the predetermined upper limit temperature and the lower limit temperature. When the count of the defrost invalidation timer 40h, which has been reset and started in step 532 in FIG. 11, reaches a predetermined defrost invalidation time, the storage control circuit 40 sets the flag in step 122 based on the determination in step 120. FLG2 is set to the value “0”. Thus, the storage control circuit 40 repeats the above-mentioned step 104 until the defrost cycle timer 40d, which has been reset and started in step 528 in FIG. 11, measures the defrost cycle.
To 110 are repeatedly executed. At this time, the temperature detected by the management temperature sensor 15 is stored in the memory 40a as the first detection temperature data S1 in step 124 in order to restart storage of the detection temperature of the management temperature sensor 15 described later. Step 126
Reset start of the sampling timer 40b to start time measurement.

On the other hand, as described above, when the freezer section A or the refrigerator section B is in the defrost operation and the flag FLG1 is set to a value of "1" to "3", and when the freezer section A or the refrigerator section B is in the state where the defrost invalid time has not elapsed since the end of the defrost operation, and the flag FLG2
Is set to “1”, that is, during the circulation processing of steps 104, 118, 110 or steps 104 to 107, 120, 108, 110 in the main program, and in the temperature management processing of step 110, FIG. In the current temperature detection process of step 202, FIG.
Based on the determination of “NO” in step 302 of
Management temperature sensor 1 including steps 304 to 314
Step 316 in place of the process of storing the detected temperature of Step 5
Is performed. This step 316 is processing for storing a predetermined invalid value “E”, which is data not representing temperature information, as current temperature data K in the memory 40a.

In the above case, step 21 in FIG.
By the process of 4, the historical temperature data KDP specified by the data specifying variable DP at this time is also set to the invalid value “E”. In the maximum / minimum temperature detection processing in step 220, as described above, the maximum temperature data Kmax and the minimum temperature data Kmin are selected after removing the historical temperature data set to the invalid value “E”. hand,
The updated data is stored in the memory 40a. Therefore, the respective temperature data Kmax and Kmin indicate the temperature in the accommodation room 12 during normal operation of the freezer section A or the refrigerator section B except when the defrost invalid time has not elapsed since the end of the defrost operation, that is, The maximum temperature and the minimum temperature over the past predetermined time T among the temperatures in the storage chamber 12 excluding the temperature when the temperature rises due to the defrost operation are continued.

The above steps 104, 118, 11
0 or steps 104 to 107, 120, 108, 11
If the start instruction switch 33 of the panel 30 is turned on during the circulating process of 0, the same steps 104 to 107 and 12 are performed.
0, 108, and 110 are completed and the flag FLG
Until 2 is set to the value “0”, the invalid value “E” is continuously stored as the historical temperature data in order from the first, and all the historical temperature data checked in the maximum / minimum temperature detection processing in the step 220 are all stored. The state set to the invalid value “E” continues. In this case, the storage control circuit 40 performs the step 406 in FIG.
After the end of the circulation processing of Steps 410 to 410, the processing of Step 424 is executed based on the determination of "YES" in Step 423. Step 424 is a process of storing the temperature in the storage chamber 12 at the start of the defrost operation represented by the defrost start temperature data K 'in the memory 40a as the maximum temperature data Kmax and the minimum temperature data Kmin. Thus, even in this case, each temperature data K
max and Kmin continue to indicate the temperature in the accommodation room 12 without being set to the invalid value “E”.

Next, the operation of the display control circuit 50 will be described. During the control processing for each of the warehouses A and B by the warehouse control circuits 40, the display control circuit 50 continues to control the display on the indicators 31a and 31b of the panel 30 by executing a program (not shown). The display control circuit 50
The current temperature data K, the maximum temperature data Kmax, and the minimum temperature data Kmin stored in the memory 40a of each storage control circuit 40 are stored in the corresponding memory of the display control circuit 50 every predetermined time (for example, 30 seconds). 50a, 5
0b is updated and stored. When the maximum / minimum temperature display switch 32 is in the off state, the memories 50a, 50
The temperature indicated by the current temperature data K stored in the memory b is continuously displayed on the corresponding displays 31a and 31b. However, at this time, if the current temperature data K is an invalid value "E", the corresponding indicators 31a, 31b
Displays a display "dF" indicating that the freezer section A or the refrigerator section B is in a defrost operation. On the other hand, when the maximum / minimum temperature display switch 32 is on, the maximum temperature data K stored in each of the memories 50a and 50b is set.
The max and the temperature represented by the minimum temperature data Kmin are alternately displayed on the corresponding indicators 31a and 31b at predetermined time intervals (for example, every two seconds). The panel 30
Is turned on, the current temperature data K, the maximum temperature data Kmax, and the minimum temperature data Kmin are immediately updated and stored in the memories 50a and 50b, and the display devices 31a and 31b are turned on. Update the display.

As described above, in the above embodiment,
Current temperature data K and maximum temperature data Km for each storage A and B
ax and the temperature represented by the minimum temperature data Kmin are indicated on the panel 30 by a single indicator 31 for each of the refrigerators A and B.
a and 31b are selectively displayed. Here, the current temperature data K represents the current temperature in the accommodation room 12 of the corresponding freezer section A or refrigerator section B. The maximum temperature data Kmax and the minimum temperature data Kmin
Represents a maximum temperature and a minimum temperature in the accommodation room 12 over a past predetermined time T. Therefore, according to the embodiment, the highest temperature and the lowest temperature can be directly recognized,
Moreover, a refrigerator-freezer to which the temperature control device is applied can be configured at low cost. In addition, the maximum temperature and the minimum temperature are the same as those in the accommodation room 1 except when the temperature is increased by the defrost operation.
Since the temperature is selected from the temperatures in the storage chambers 2, the temperatures in the storage chambers 12 during the normal operation of the storages A and B can be accurately managed.

When the freezer section A or the refrigerator section B is in the defrosting operation or the defrost invalid time has not elapsed since the end of the defrosting operation, the corresponding freezer control circuit 40 for each of the freezers A and B is provided. Since the current temperature data K in the memory 40a is set to the invalid value “E”, the display control circuit 5
0, the current temperature data K in the corresponding memories 50a, 50b
Is also set to the invalid value “E” and the corresponding indicator 3 on the panel 30
At 1a and 31b, a display “dF” is displayed instead of the current temperature in the accommodation room 12. Therefore, according to the embodiment, the operating state of each of the warehouses A and B can also be recognized.

When the start instruction switch 33 is turned on when the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed since the end of the defrost operation, the respective refrigerators A, Maximum temperature data Kma in the memory 40a of the storage control circuit 40 corresponding to B
x and the minimum temperature data Kmin are set to the temperatures in the storage chamber 12 when the warehouses A and B start the defrost operation. Therefore, in the indicators 31a and 31b, the display of the maximum temperature and the minimum temperature can always be displayed without interruption, and the usability of the refrigerator to which the temperature management device is applied is improved.

B. Second Embodiment Next, a second embodiment of the present invention will be described. In this embodiment, the maximum and minimum temperatures of the temperatures to be managed since the start instruction operation are displayed. This embodiment is similar to the first embodiment shown in FIGS.
6, an area for storing the historical temperature data K1 to Kn may be omitted in the memory 40a of the refrigerator control circuit 40 in FIGS. Also, a temperature management timer 4
0c may also be omitted. In the second embodiment, each storage control circuit 40 executes the main program of FIG. 7 similarly to the first embodiment, but in the same program, the start process of step 102 and the temperature management process of step 110 Is a process different from that of the first embodiment.

In the start processing of step 102,
Each warehouse control circuit 40 sets the flags FLG1 and FLG2 to the value “0”, resets the sampling timer 40b and the defrost cycle timer 40d, starts timekeeping, and starts measuring the temperature detected by the control temperature sensor 15 at that time. Is stored in the memory 40a as the first detected temperature data S1, and the invalid value “E” is stored in the memory 40a as the maximum temperature data Kmax and the minimum temperature data Kmin, and the temperature data Kmax and Kmin are initialized. .

As the temperature management process in step 110, each storage control circuit 40 executes a program shown in FIG. Each time the execution of the temperature management process is started in step 600, the storage control circuit 40 executes step 202 in step 202 of FIG.
A current temperature detection process similar to the above is executed. Accordingly, if the freezer section A or the refrigerator section B is in normal operation except when the defrost invalid time has not elapsed since the end of the defrost operation, the temperature in the accommodation room 12 at that time is detected. , Is stored in the memory 40a as the current temperature data K. If the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed since the end of the defrost operation, the invalid value “E” is set.
Is stored in the memory 40a as the current temperature data K.

After the current temperature detection processing, step 604
, The maximum and minimum temperature detection process shown in detail in FIG. 13 is executed. The storage control circuit 40 starts executing the maximum and minimum temperature detection processing in step 700, and the temperature represented by the current temperature data K stored in step 602 in FIG. 12 is the maximum temperature data stored in the memory 40a. Km
If the temperature is higher than the temperature represented by ax, the maximum temperature data Km is determined in step 708 based on the determination in step 706.
ax is updated with the current temperature data K. On the other hand, if the temperature represented by the current temperature data K is lower than the temperature represented by the minimum temperature data Kmin, the minimum temperature data Kmin is updated with the current temperature data K at step 714 based on the determination at step 712. However, the current temperature data K
Are set to the invalid value “E” in the current temperature detection process in step 602, the above processes are avoided based on the determination in step 702. Therefore, the respective temperature data Kmax and Kmin always indicate the temperature in the accommodation room 12 during normal operation of the freezer section A or the refrigerator section B except when the defrost invalid time has not elapsed since the end of the defrost operation. In other words, among the temperatures in the storage chamber 12 excluding the temperature when the temperature is increased by the defrost operation, the highest temperature and the lowest temperature since the start of the operation of the refrigerator-freezer or the ON operation of the start instruction switch 33 of the panel 30 described later are shown. Will continue. When the maximum temperature data Kmax and the minimum temperature data Kmin are set to the invalid value “E” by the start processing of step 102 in FIG.
Based on the determination at 4,710,
The respective temperature data Kmax, Kmin are updated with the current temperature data K without going through the comparison determination processing of 6,712.

After the above-described maximum / minimum temperature detection processing, if the start instruction switch 33 of the panel 30 has not been turned on, the storage control circuit 40 proceeds to step 614 based on the determination of “NO” in step 606. This temperature management process ends. By repeatedly executing such a temperature management process, during the circulation process of steps 104 to 110 in FIG.
The current temperature data K, the maximum temperature data Kmax, and the minimum temperature data Kmin stored in the memory 40a are continuously updated at every sampling cycle.

On the other hand, if the start instruction switch 33 of the panel 30 is turned on during the repetitive execution, the warehouse control circuit 40 changes the program to step 608 and thereafter based on the determination of “YES” in step 606. Proceed. At this time, the freezer section A or the refrigerator section B is in normal operation except when the defrost invalid time has not elapsed since the end of the defrost operation, and the flags FLG1, FLG
If G2 is both set to the value “0”, step 60
Based on the determination of "YES" in step 8, step 61
At 0, the temperature in the accommodation room 12 at that time represented by the current temperature data K is updated and stored in the memory 40a as the maximum temperature data Kmax and the minimum temperature data Kmin. On the other hand, when the freezer section A or the refrigerator section B is in the defrost operation and the flag FLG1 has a value of “1” to
The flag FLG2 is set to “3” or the freezer section A or the refrigerator section B is in a state where the defrost invalid time has not elapsed since the end of the defrost operation and the flag FLG2 is set to the value “1”.
If it is set to "NO" in step 608,
In step 612, the temperature in the storage chamber 12 at the start of the defrost operation, which is represented by the defrost start temperature data K ', is set to the maximum temperature data Km.
ax and the minimum temperature data Kmin are updated and stored in the memory 40a. Thereby, each temperature data Km
Without setting ax and Kmin to the invalid value “E”, the maximum temperature and the minimum temperature in the accommodation room 12 are measured again.

As described above, in the second embodiment, the current temperature data K is stored in the accommodation room 12 for each of the warehouses A and B.
, The maximum temperature data Kmax and the minimum temperature data Kmin continue to represent the maximum temperature and the minimum temperature in the accommodation room 12 since the start instruction switch 33 of the panel 30 was turned on, respectively. Therefore, panel 30
In the first embodiment, the display control of the display control circuit 50 is the same as that of the first embodiment. And the minimum temperature are selectively displayed. Thereby, the maximum temperature and the minimum temperature can be directly recognized, and the refrigerator-freezer to which the temperature management device is applied can be configured at low cost. Also, in the second embodiment, similarly to the case of the first embodiment, the temperature in the storage chamber 12 that has risen due to the defrost operation is not detected and displayed as the maximum temperature or the minimum temperature. Therefore, the temperature in each accommodation room 12 at the time of normal operation of each storage A and B can be managed appropriately.

Similarly to the case of the first embodiment, when the freezer section A or the refrigerator section B is in the defrost operation or when the defrost invalid time has not elapsed since the end of the defrost operation, the same operation of the panel 30 is performed. Freezer section A
Alternatively, since the display "dF" is displayed on the indicators 31a and 31b corresponding to the refrigerator B in place of the current temperature in the accommodation room 12, it is also possible to recognize the operation state of the refrigerators A and B. it can.

As in the case of the first embodiment, when the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed since the end of the defrost operation, the start instruction switch 33 is set. Is turned on, the maximum temperature data Kmax and the minimum temperature data Kmin of the memory 40a of the storage control circuit 40 corresponding to each of the storages A and B are set to the temperature in the storage chamber 12 at the start of the defrost operation. Display 31a, 31b
Thus, the display of the maximum temperature and the minimum temperature can always be displayed without interruption, and the usability of the refrigerator-freezer to which the temperature management device is applied is improved.

C. Third Embodiment Next, a third embodiment of the present invention will be described. In this embodiment, the maximum temperature and the minimum temperature of the temperature to be managed at predetermined time intervals are displayed. This embodiment is also configured as shown in FIGS. 1 to 6 in the same manner as the above embodiments, but the memory 40a of the storage control circuit 40 shown in FIGS.
In, the area for storing the historical temperature data K1 to Kn may be omitted. The memory 40a has an area for storing the first to n-th data sets, as indicated by the two-dot chain line in FIG. Each data set is composed of maximum temperature data and minimum temperature data representing the maximum temperature and the minimum temperature in the accommodation room 12 at predetermined time intervals. In the third embodiment,
As shown by a two-dot chain line in FIGS. 2 and 3, a period selection dial 34 connected to the display control circuit 50 is provided on the panel 30. In the third embodiment, each of the storage control circuits 40 executes the main program of FIG. 7 similarly to the above-described embodiments, but in the same program, the start process of step 102 and the temperature management process of step 110 The processing is different from the above embodiments.

In the start processing of step 102,
Each storage control circuit 40 sets the flags FLG1 and FLG2 to a value “0”, resets the sampling timer 40b, the temperature management timer 40c, and the defrost cycle timer 40d to start timekeeping. The detected temperature is stored in the memory 40a as first detected temperature data S1, and the invalid value "E" is stored in the memory 4a as the maximum temperature data Kmax and the minimum temperature data Kmin.
At 0a, the temperature data Kmax and Kmin are initialized and the data set designation variable SP is set to a value "0". The data set designation variable SP indicates the number of the data set to be stored next in the memory 40a.

As the temperature management process in step 110, each storage control circuit 40 executes a program shown in FIG. Each time the warehouse control circuit 40 starts executing the temperature management process in step 800, in step 802, the process proceeds to step 202 in FIG.
Then, a current temperature detection process similar to step 602 in FIG. 12 in the second embodiment is executed. Step 8
At 04, the same maximum / minimum temperature detection processing as in step 604 of FIG. 12 in the second embodiment is executed. By each of these processes, the current temperature data K indicates the temperature in the accommodation room 12 at the time during the normal operation of the freezer section A or the refrigerator section B except for the state in which the defrost invalid time has not elapsed since the end of the defrost operation. When the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed since the end of the defrost operation, the invalid value “E” is kept set. The maximum temperature data Kmax and the minimum temperature data Kmi
n is the freezer section A except when the defrost invalid time has not elapsed since the end of the defrost operation.
Alternatively, the operation of the refrigerator-freezer or the steps 820 and 822 described later among the temperatures in the storage chamber 12 during the normal operation of the refrigerator section B, that is, the temperatures in the storage chamber 12 excluding the temperature when the temperature is increased by the defrost operation. Continue to represent the highest and lowest temperatures since the treatment of.

After the above processing, the start instruction switch 33 of the panel 30 has not been turned on, and the timer of the temperature management timer 40c, which has been reset and started in the start processing of step 102 in FIG. If the temperature has not reached, based on the determination of “NO” in steps 806 and 808, the storage control circuit 40 ends this temperature management processing in step 826.

On the other hand, during the repetitive execution, a predetermined time T has elapsed since the start of the operation of the refrigerator-freezer, and the timer of the temperature management timer 40c, which has been reset and started in the start processing of step 102 in FIG. When the predetermined time T has been reached, based on the determination of “YES” in step 808, the storage control circuit 40 advances the program to step 810 and subsequent steps.

In this case, the warehouse control circuit 40 executes step 8
At 10, the maximum temperature data Kma stored until then
x and the minimum temperature data Kmin are stored in the memory 40a as the maximum temperature data KmaxSP and the minimum temperature data KminSP of the data set specified by the data set specification variable SP. Then, after adding the value “1” to the data set specifying variable SP in step 812, if the added data set specifying variable SP does not exceed the value n which is the number of the largest data set, “ Based on the determination of "NO", the program proceeds to step 818 or later. At this time, the freezer section A or the refrigerator section B is in normal operation except when the defrost invalid time has not elapsed since the end of the defrost operation, and the flags FLG1, FLG2
Are both set to the value “0”, based on the determination of “YES” in step 810, the temperature in the storage chamber 12 at that time represented by the current temperature data K is determined in step 820. Is updated and stored in the memory 40a as the maximum temperature data Kmax and the minimum temperature data Kmin. On the other hand, when the freezer section A or the refrigerator section B is in the defrost operation and the flag FLG1 has a value of “1” to “3”.
Or the freezer section A or the refrigerator section B
Is in a state where the defrost invalid time has not elapsed since the end of the defrost operation, and if the flag FLG2 is set to the value “1”, based on the determination of “NO” in the step 818, The temperatures in the storage chamber 12 at the start of the defrost operation represented by the defrost start temperature data K ′ are defined as the maximum temperature data Kmax and the minimum temperature data Kmin in the memory 40a.
And store the updated information. Thereby, each temperature data Kmax,
Without setting Kmin to the invalid value “E”, the maximum temperature and the minimum temperature in the accommodation room 12 will be measured again.

After each of the above processes, the storage control circuit 40 resets and starts the temperature management timer 40c in step 824, and again starts timekeeping. In step 826, the execution of the temperature management process is temporarily terminated. By repeatedly executing such a temperature management process, the accommodation room 12 for each predetermined time T is set.
The maximum temperature and the minimum temperature in each are the maximum temperature data K
max and the minimum temperature data Kmin,
The data sets are sequentially stored in the memory 40a from the first data set.

During the repetitive execution, when the first to n-th data sets are stored in the memory 40a, the value of the data set designation variable SP becomes " n + 1 ”and exceeds the value“ n ”. In this case, based on the determination of “YES” in step 814, the storage control circuit 40 sets the data designation variable SP to the value “1” again in step 816. Thus, in step 810, the data sets are stored again in order from the first again.

On the other hand, if the start instruction switch 33 of the panel 30 is turned on during the above-mentioned repetition, the refrigerator control circuit 40 determines the time of the temperature management timer 40c based on the determination of “YES” in step 806. Regardless of the value of the data set designation variable SP, the program proceeds to step 816 to set the data designation variable SP to the value “1”. In this case as well, the data sets are stored again sequentially from the first.

In the third embodiment, the display control circuit 50 updates and stores the maximum temperature data Kmax and the minimum temperature data Kmin in the memories 50a and 50b based on selection by the period selection dial 34. ing. Specifically, the memory 4 of each storage control circuit 40
Among the maximum temperature data Kmax and the minimum temperature data Kmin stored in the data set 0a and the maximum temperature data and the minimum temperature data of each data set, the period selection dial 3
A set of the maximum temperature data and the minimum temperature data corresponding to the period selected by the step 4 is updated and stored in the memories 50a and 50b of the display control circuit 50 corresponding to the respective cabinets A and B. For example, if the period specified by the period selection dial 34 is the latest period, that is, the period during which the measurement of the maximum temperature and the minimum temperature is continued, the display control circuit 50 Are updated and stored as the maximum temperature data Kmax and the minimum temperature data Kmin of the memories 50a and 50b, respectively. If the period selected by the period selection dial is a period preceding by a predetermined number, the data set designation variable stored in the memory 40a of each warehouse control circuit 40 is stored in each warehouse control circuit 40. S
Maximum temperature data Kmax and minimum temperature data Kmi of a data set specified by a value obtained by subtracting the same predetermined number from P
n is stored as the maximum temperature data Kmax and the minimum temperature data Kmin of each of the memories 50a and 50b. When the value obtained by subtracting the predetermined number from the data set designation variable SP becomes a negative number, the maximum temperature data Kmax and the minimum temperature data Kmin of the data set specified by adding the value “n” to the same value. Is stored. Thus, in the indicators 31a and 31b, when the maximum / minimum temperature display switch 32 is in the off state, the current temperature or the display “dF” in the corresponding accommodating chamber 12, as in each of the above embodiments, is displayed. When the maximum / minimum temperature display switch 32 is in the ON state, the maximum temperature and the minimum temperature for each predetermined time T in the period selected by the period selection dial 34 in the corresponding accommodation room 12 are displayed. Displayed alternately.

As described above, in the third embodiment, the current temperature in the storage room 12 for each of the warehouses A and B, and the maximum temperature and the minimum temperature for each predetermined time T are stored in the panel 30 respectively. Thus, a single display 31a,
It is selectively displayed by 31b. Therefore, according to the embodiment, the highest temperature and the lowest temperature can be directly recognized, and the refrigerator-freezer to which the temperature management device is applied can be configured at low cost. Also in the third embodiment, the temperature in the storage chamber 12 that has risen due to the defrost operation is not detected and displayed as the maximum temperature or the minimum temperature, as in the above-described embodiments. The temperature in each accommodation room 12 at the time of normal operation of each warehouse A and B can be managed accurately.

As in the above embodiments, when the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed from the end of the defrost operation, the same freezer section of the panel 30 is used. Since the display "dF" is displayed instead of the current temperature in the accommodation room 12 on the indicators 31a and 31b corresponding to the refrigerator A or the refrigerator B, the operation state of the freezer A or the refrigerator B is also recognized. can do.

As in the above embodiments, the start instruction switch 33 is turned on when the freezer section A or the refrigerator section B is in the defrost operation or the defrost invalid time has not elapsed since the end of the defrost operation. When operated, the storage control circuits 40 corresponding to the respective storages A and B
Since the maximum temperature data Kmax and the minimum temperature data Kmin of the memory 40a are set to the temperatures in the storage chamber 12 at the start of the defrosting operation of the warehouses A and B, the display 31
The maximum temperature and the minimum temperature can be always displayed without interruption at a and 31b, and the usability of the refrigerator-freezer to which the temperature management device is applied is improved.

In each of the above embodiments, the temperature control device is applied to a refrigerator having a freezer section A and a refrigerator section B, and the displays A, 31b of the panel 30 show the respective refrigerators A, 31B. The current temperature in the accommodation room 12 for each B,
Although the maximum temperature and the minimum temperature are selectively displayed, the temperature management device is applied to a single refrigerator, and only the above-mentioned temperatures in the accommodation room 12 of the single refrigerator are selectively displayed. You may make it. In this case, the display 31 of the panel 30
It is preferable to omit one of a and 31b and selectively display each of the above temperatures on the other display.

Further, in each of the above embodiments, the freezer section A and the refrigerator section B each apply the temperature control device to the refrigerator including the compressor 17, the defrost heater 19 and the cooling fan 22, but the temperature control apparatus is used. In the refrigerator, only the freezer section A includes a compressor 17, a defrost heater 19, and a cooling fan 22, and selectively connects the storage chamber 12 of the refrigerator section B to the storage chamber 12 of the freezer section A. The present invention can be similarly applied to a refrigerator-freezer in which the temperature in the accommodation room 12 of B is controlled.

Further, in each of the above embodiments, each control of the temperature management device is executed by using the refrigerator control circuit 40 for each of the refrigerators A and B for controlling the compressor 17 and the cooling fan 19 in the refrigerator. However, each control of the panel 30, the display control circuit 50, and the temperature management device is performed by each of the warehouses A,
An electric control circuit executed for each B may be housed in a separate housing, and the temperature control device may be configured independently. In this case, the above-mentioned electric control circuit is provided from each of the storages A and B to
It is good to be constituted so that information, such as a temperature in the inside and an operation state, may be transmitted.

Further, in each of the above embodiments, the above-described control is executed for each of the storages A and B with the temperature in the storage room 12 as a management target, but the core temperature of the food F is set as a management target. The same control may be executed. In this case, as shown by the two-dot chain line in FIG.
5 is configured as a bar and inserted into the food F so that the core temperature of the food F is detected by the management temperature sensor 15, and the above-described respective controls are executed based on the detected core temperature of the food F. It is good to do so. Further, the control temperature sensor 15 is covered with a film having the same heat capacity as the food material F so that the control temperature sensor 15 virtually detects the core temperature of the food material F. Each of the above controls may be executed based on the above. Further, a core temperature estimation switch group for setting a heat radiation coefficient and a heat capacity of the food F, a correction coefficient corresponding to the position of the food F in the accommodation room 12 and the like is connected to each storage control circuit 40, Based on each coefficient set by the core temperature setting switch group, the core temperature of the same food F is estimated and detected from the temperature in the accommodation room 12 detected by the control temperature sensor 15, and the detected food F is detected. Each of the above-described controls may be executed based on the core temperature.

In the above embodiment, when the maximum / minimum temperature display switch 32 is on, the display 3
Although the maximum temperature and the minimum temperature of each of the refrigerators A and B are alternately switched and displayed at 1a and 31b, instead of the maximum and minimum temperature display switch 32, two switches are used.
It is also possible to provide a plurality of such switches so that only one of the maximum temperatures is continuously displayed when one of the switches is on, and only the minimum temperature is continuously displayed when the other switch is on.

[Brief description of the drawings]

FIG. 1 is a sectional view of a refrigerator-freezer unit to which a temperature management device according to first to third embodiments of the present invention is applied.

FIG. 2 is a plan view of a panel according to first to third embodiments of the present invention.

FIG. 3 is a block diagram showing an electric control unit of the refrigerator-freezer.

FIG. 4 is a block diagram showing details of each storage control circuit of FIG. 3;

FIG. 5 is a format diagram of the memory of FIG. 4;

FIG. 6 is a format diagram of a memory of the display control circuit of FIG. 3;

FIG. 7 is a flowchart showing a main program executed by the storage control circuit of FIGS.

FIG. 8 is a flowchart showing details of a temperature management process of FIG. 7 according to the first embodiment of the present invention.

FIG. 9 is a flowchart illustrating details of a current temperature detection process of FIG. 8;

FIG. 10 is a flowchart illustrating details of a maximum / minimum temperature detection process of FIG. 8;

FIG. 11 is a flowchart showing details of a defrost operation control process of FIG. 7;

FIG. 12 is a flowchart illustrating details of a temperature management process in FIG. 7 according to the second embodiment of the present invention.

FIG. 13 is a flowchart illustrating details of a maximum / minimum temperature detection process in FIG. 12;

FIG. 14 is a flowchart showing details of the temperature management process of FIG. 7 according to the third embodiment of the present invention.

[Explanation of symbols]

F: food material, 10: housing, 12: accommodation room, 15: control temperature sensor, 30: panel, 31a, 31b: display, 32: maximum and minimum temperature display switch, 33: start instruction switch, 40: storage control circuit, 40a ... memory, 50 ...
Display control circuit.

Claims (11)

[Claims] 1. A temperature control apparatus applied to a low-temperature storage for storing foods in a storage room in a low-temperature state and managing the temperature in the storage room or the core temperature of the foods, the temperature being controlled. A temperature detection unit that detects at least one of a maximum temperature and a minimum temperature from temperatures detected within a past predetermined time from the present by the temperature detection unit; and A temperature control device comprising a temperature detected by the temperature detection means, or a display for displaying the maximum temperature or the minimum temperature detected by the maximum / minimum temperature detection means, wherein the temperature is detected by the temperature detection means. Display control means for selectively displaying the maximum temperature or the minimum temperature detected by the maximum or minimum temperature detection means on the display. And a temperature control device for the low-temperature storage. 2. A temperature control device applied to a low-temperature storage for storing foods in a storage room in a low temperature state, wherein the temperature of the storage room or the core temperature of the foods is managed. Temperature detection means for detecting the temperature, a start instruction switch for instructing the start of monitoring of the temperature to be managed, and the highest and lowest temperatures among the temperatures detected by the temperature detection means after the start instruction by the start instruction switch. Maximum and minimum temperature detection means for detecting at least one of the temperatures, and a temperature detected by the temperature detection means, or a maximum or minimum temperature detected by the maximum and minimum temperature detection means. A temperature control device comprising a display and a temperature detected by the temperature detecting means and a temperature detected by the highest and lowest temperature detecting means. Temperature control apparatus for the low-temperature storage, characterized in that a display control means for displaying selectively said display a high temperature or minimum temperature. 3. The temperature management device according to claim 1, wherein the display control means includes a display designating means for designating display contents on a display. Display switching means for selectively displaying the temperature detected by the temperature detection means and the maximum temperature or the minimum temperature detected by the maximum and minimum temperature detection means on the display in accordance with the designation by the display designation means. A temperature control device for a low-temperature storage, wherein the temperature control device is configured. 4. The temperature management device according to claim 3, wherein said display designating means comprises a display instruction switch which switches between an on state and an off state, and said display switching means comprises a state in which said display instruction switch is in an off state. When the display instruction switch is on, the temperature detected by the temperature detection means is displayed on the display when it is in the maximum temperature and the minimum temperature detected by the maximum and minimum temperature detection means when the display instruction switch is on. A temperature management device for a low-temperature storage, wherein at least one of them is displayed on the display. 5. A temperature control apparatus applied to a low-temperature storage for storing foodstuffs in a storage room in a low-temperature state and managing the temperature in the storage room or the core temperature of the foodstuffs, wherein the temperature to be managed is controlled. Temperature detecting means for detecting at least one of the highest temperature and the lowest temperature among the temperatures detected by the temperature detecting means after a predetermined time in the past; and A temperature control device including a temperature detected by the detection means, or a display for displaying the maximum temperature or the minimum temperature detected by the maximum / minimum temperature detection means, respectively, instructing display contents on the display. A display instruction switch for performing the operation, and when the display instruction switch is in an off state, the temperature detected by the temperature detection unit is displayed on the display. Display switching means for displaying on the display at least one of the maximum temperature and the minimum temperature detected by the maximum and minimum temperature detection means when the display instruction switch is on. A temperature control device for a low-temperature storage. 6. A temperature control apparatus applied to a low-temperature storage for storing foods in a storage room in a low temperature state, and managing the temperature in the storage room or the core temperature of the foods, wherein the temperature to be controlled is controlled. Temperature detecting means for detecting the maximum temperature and the lowest temperature among the temperatures detected by the temperature detecting means after a predetermined time in the past, and the highest and lowest temperature detecting means, respectively, which are detected by the temperature detecting means. And a display for displaying the maximum temperature or the minimum temperature detected by the maximum and minimum temperature detection means, respectively, a display instruction switch for instructing display contents on the display. And displaying the temperature detected by the temperature detection means on the display when the display instruction switch is in the off state, and Display switching means for alternately displaying the maximum temperature and the minimum temperature detected by the maximum and minimum temperature detection means on the display every predetermined time when the display instruction switch is in an on state. Temperature control device for storage. 7. The present invention is applied to a low-temperature storage for storing foods in a storage room in a low temperature state during normal operation and intermittently performing a defrost operation, and manages the temperature in the storage room or the core temperature of the foods. A temperature management device, comprising: a temperature detection unit that detects a temperature to be managed; and at least one of a maximum temperature and a minimum temperature among temperatures detected by the temperature detection unit after a predetermined time in the past. A maximum / minimum temperature detection means for detecting one of the temperatures, and a display for displaying the temperature detected by the temperature detection means, or the maximum temperature or the minimum temperature detected by the maximum / minimum temperature detection means, respectively. In the temperature management device, during the normal operation of the low-temperature storage, the temperature detected by the temperature detection means and the temperature detected by the maximum and minimum temperature detection means are detected. The displayed maximum temperature or minimum temperature is selectively displayed on the display, and during the defrost operation of the low-temperature storage, a display indicating that the defrost operation is being performed and the maximum detected by the maximum / minimum temperature detection means are displayed. A temperature control device for a low-temperature storage, comprising a display control means for selectively displaying a temperature or a minimum temperature on the display. 8. The temperature control device according to claim 7, wherein said maximum and minimum temperature detecting means is selected from a temperature detected by said temperature detecting means during a normal operation of said low-temperature storage after said predetermined time. A temperature management device for a low-temperature storage, wherein at least one of the highest temperature and the lowest temperature is detected. 9. Applicable to a low-temperature storage that stores food in a storage room at a low temperature during normal operation and intermittently executes a defrost operation, and manages the temperature in the storage room or the core temperature of the food. A temperature management device, comprising: a temperature detection unit configured to detect a temperature to be managed; a start instruction unit configured to start monitoring of the temperature to be managed; and a start instruction performed by the temperature detection unit by the start instruction unit. A maximum / minimum temperature detecting means for detecting at least one of the maximum temperature and the minimum temperature from the temperatures detected during the normal operation of the low temperature storage thereafter; and a maximum temperature detected by the maximum / minimum temperature detecting means. Or a maximum / minimum temperature storage means for storing a minimum temperature, and a temperature detected by the temperature detection means, or a maximum / minimum temperature storage means. A temperature management device comprising a display for displaying the stored maximum temperature or minimum temperature, wherein the temperature detected by the temperature detection means and the maximum temperature stored by the maximum / minimum temperature storage means Display control means for selectively displaying the lowest temperature on the display; defrost start storage means for storing the temperature detected by the temperature detection means when the low temperature storage starts defrost operation; and defrost of the low temperature storage. Updating means for updating the temperature stored in the maximum / minimum temperature storage means with the temperature stored in the defrost start storage means when a start instruction is given by the start instruction means during operation. Characterized temperature control device for low temperature storage. 10. The temperature management device for a low-temperature storage according to claim 9, wherein said start instruction means is constituted by a start instruction switch. 11. The temperature management apparatus according to claim 9, wherein said start instruction means is a time measuring means for measuring time, and said temperature is monitored each time said time measuring means measures a predetermined time. A temperature control device for a low-temperature storage, characterized by comprising an instruction means for instructing start.