JPH04273981A - Freezer-refrigerator device - Google Patents

Abstract

PURPOSE:To prevent a temperature within a freezer-refrigerator device from being increased as a door of the device is opened or closed by a method wherein a day is divided into a plurality of time zones, a time zone having a high frequent opening or closing of the door is set in response to the number of opening or closing of the door and during this time zone and a predetermined period before this time zone, a temperature within the freezer-refrigerator device is controlled to show a higher value than its target temperature. CONSTITUTION:A temperature control circuit 16 controls a temperature within a freezer-refrigerator device by receiving signals from a door opening or closing sensing element 17, a refrigerator room temperature sensing element 18 and a freezer chamber temperature sensing element 19. In this case, a micro-computer 20 divides a day into a plurality of time zones and counts a door opening or closing for every time zone. Then, the time zone showing a high frequent opening or closing is specified as a high frequent opening or closing time zone. Then, during the high frequent opening or closing time zone and during a predetermined period before it, a fan motor 9, a compressor 10 and a damper 13 are controlled in such a way as a temperature within the freezer-refrigerator device is set to be lower than its target temperature.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator-freezer which is designed to suppress the rise in temperature inside the refrigerator due to opening and closing of the door.

0002

2. Description of the Related Art Generally, in a refrigerator-freezer, temperature control is performed so that food stored in a refrigerator compartment and a freezer compartment are stored at low temperatures of about -18°C and 3°C, respectively. In such refrigerator-freezers, when the temperature inside the refrigerator rises, the compressor, evaporator, capillary tube, and condenser are operated, and as a result, the cold air generated by the refrigerant evaporated in the evaporator is sent into the refrigerator by the blower fan. Temperature control is performed to reduce the temperature inside the refrigerator to the target temperature by circulating it.

[0003] Furthermore, in a refrigerator-freezer, the cold air that circulates inside the refrigerator removes both heat and moisture from the food, so that moisture forms frost and adheres to the evaporator. When frost builds up thickly on the evaporator, its cooling capacity decreases and eventually the evaporator loses its cooling capacity. Therefore, the refrigerator usually contains
In order to prevent such frost buildup, defrosting is performed at regular intervals. For defrosting, for example, a method is used in which frost adhering to the evaporator is removed by heating the evaporator with a defrosting heater.
), when the cumulative operating time of the compressor reaches a certain period, the defrosting heater is generally turned on as shown in (d) of the same figure.

0004

By the way, in order to preserve the food inside the refrigerator for as long as possible, it is desirable to maintain the inside of the refrigerator at a constant target temperature and suppress the temperature rise as much as possible.

[0005] However, in actual use of the above-mentioned conventional refrigerator-freezer, the door is frequently opened and closed as shown in FIG. The temperature increases as shown in (a) of the figure. As described above, in conventional refrigerator-freezers, no effective measures have been taken to counteract the risk of adverse effects on food due to temperature rise inside the refrigerator.

[0006] Also, during defrosting, cooling is stopped for several tens of minutes, so the temperature inside the refrigerator tends to rise, so in order to prevent the temperature from rising further, the door should be opened and closed as much as possible. It is desirable that there is no such thing.

However, in the above conventional refrigerator-freezer, the door is frequently opened and closed as shown in (b) of the figure while the defrosting heater is on (see (d) of FIG. 9). It is possible. In this case, the temperature inside the refrigerator is (
As shown in a), there is a risk that the food storage condition will be further deteriorated due to the increase in the food storage temperature compared to the above case. As described above, conventional refrigerator-freezers do not take any effective measures against the temperature rise inside the refrigerator caused by opening and closing the door during defrosting.

[0008]

[Means for Solving the Problems] In order to solve the former problem, the refrigerator-freezer according to claim 1 of the present invention is equipped with a temperature control means for controlling the temperature inside the refrigerator, and has the following features. It is characterized by the fact that it takes such measures.

That is, in the refrigerator-freezer according to the first aspect, the number of openings and closings of the door is obtained by the opening/closing detection means, and the number of openings and closings is divided into a plurality of time periods in one day, and the number of openings and closings is determined for each time period. is stored in a storage means such as a memory,
The high opening/closing frequency time zone setting means sets a time zone in which the number of openings and closings is greater than a predetermined reference number of times as a high opening/closing frequency time zone, and the low temperature control means sets the above-mentioned high opening/closing frequency time zone and the predetermined period before that. A configuration is adopted in which the temperature control means is operated so that the temperature inside the refrigerator becomes lower than the target temperature.

Further, in order to solve the latter problem, the refrigerator-freezer according to claim 2 of the present invention is provided with a defrosting means for removing frost generated on the evaporator for evaporating the refrigerant. It is characterized by the following measures:

That is, in the refrigerator-freezer according to the second aspect, the opening/closing detection means obtains the number of openings and closings of the door in a predetermined period, and divides the day into a plurality of time periods and calculates the number of openings and closings for each time period. The low opening/closing frequency time zone setting means sets a time zone in which the number of openings and closings is less than a predetermined standard number of times as a low opening/closing frequency time zone, and the defrosting control means sets the low opening/closing frequency time zone. A configuration is adopted in which the defrosting means is operated during a frequency period.

0012

[Function] Since the user's life cycle is considered to be almost constant every day, the opening and closing of the refrigerator/freezer door is concentrated on cooking and eating in the morning and evening, based on that life cycle. It can be considered that there are almost no cases late at night.

In the refrigerator-freezer according to the first aspect, the high opening/closing frequency time zone setting means determines the time period when the number of openings/closings is greater than a predetermined reference number based on the opening/closing frequency of the door checked in advance by the opening/closing detection means and the storage means. The zone is set as the high opening/closing frequency time zone. Therefore, by low temperature control means,
By continuously operating the temperature control means from the predetermined period before entering the high opening/closing frequency time period to control the temperature inside the refrigerator to be lower than the target temperature, the temperature inside the refrigerator increases during the high opening/closing frequency time period. Even if the target temperature is exceeded, it will almost never exceed the target temperature.

Further, in the refrigerator-freezer according to the second aspect, the low opening/closing frequency time zone setting means determines the number of openings/closings from the predetermined reference number of times based on the opening/closing frequency of the door checked in advance by the opening/closing detection means and the storage means. A time period with a low opening/closing frequency is set as a time period with a low opening/closing frequency. Therefore, by operating the defrosting control means to defrost the inside of the refrigerator during the above-mentioned low opening/closing frequency time period, defrosting can be performed while avoiding the time period when the door opening/closing frequency is high. can.

Therefore, according to the refrigerator-freezer of the present invention,
The temperature inside the refrigerator is controlled based on the frequency of opening and closing the door according to the user's life cycle, and the temperature inside the refrigerator increases due to frequent opening and closing of the door, and the frequent opening and closing of the door and defrosting occur at the same time. It is possible to significantly suppress the temperature rise inside the refrigerator due to this.

[0016] In both of the above configurations, in order to determine with high accuracy whether the door opening/closing frequency is high or low, it is preferable to use a method of accumulating the opening/closing frequency for one week, for example, instead of one day.

[0017]

[Embodiment] Fig. 1 to Fig. 4 regarding the first embodiment of the present invention
The explanation based on this is as follows.

As shown in FIG. 4, the refrigerator-freezer according to this embodiment has a refrigerator compartment 1 and a freezer compartment 2 provided above the refrigerator compartment 1. The refrigerator compartment 1 is provided with a door 3 that can be opened and closed at the front, and a cold air introduction section 4 that introduces cold air at the rear. Shelves 5 are arranged in three stages. Moreover, the cold air introduction part 4 is provided with cold air blow-off ports 4a for blowing out cold air for each placement position of the food shelf 5.

On the other hand, the freezer compartment 2 is provided with a door 6 that can be opened and closed at the front, and an evaporator 7 that evaporates refrigerant to generate cold air at the back, and sends the cold air into the freezer compartment 2. A blower fan 8 is provided. This blower fan 8 is driven by a fan motor 9. Further, the refrigerant is supplied to the evaporator 7 from the compressor 10 provided at the lowest end of the refrigerator-freezer via a condenser and capillary tube (not shown), and is circulated so that it is returned to the compressor 10 again. are doing.

A defrosting heater 11 for heating the evaporator 7 for defrosting is provided near the lower end of the evaporator 7, and below the defrosting heater 11, cold air from the freezer compartment 2 is transferred to a cold air introducing section 4.
An introduction passage 12 is provided that leads to. This introduction passage 1
A damper 13 is provided near the opening at the lower end of the freezer compartment 2, and by opening and closing the opening of the introduction passage 12 with this damper 13, the amount of cold air introduced from the freezer compartment 2 to the cold air introduction section 4 is adjusted. It has become. Furthermore, the refrigerator compartment 1 and the freezer compartment 2 communicate with each other via a communication section 14 on the front side, and the cold air that has cooled the food is transferred to the evaporator 7 through a return passage 15 provided following the communication section 14. It is supposed to be returned to.

[0021] The configuration of the temperature control section in this refrigerator-freezer will be explained.

As shown in FIG. 2, the temperature control section has a temperature control circuit 16, and this temperature control circuit 16 includes:
Door opening/closing detection element 17 and refrigerator temperature detection element 18 on the input side
and the freezer compartment temperature detection element 19 are connected,
Fan motor 9, compressor 10 and damper 13 on the output side
is connected. The temperature control circuit 16 controls the operation of the fan motor 9, the compressor 10, and the damper 13 based on the signals output from each of the above-mentioned elements 17 to 19 so as to maintain the temperature of the refrigerator compartment 1 and the freezing compartment 2 at the target temperature. is designed to be controlled.

The door opening/closing detection element 17 is an element that detects the opening/closing of the doors 3 and 6 as an H/L door opening/closing signal, and has a function as an opening/closing detection means, and although not shown in FIG. It is provided near the door 3 of the refrigerator compartment 1 and the door 6 of the freezer compartment 2. The refrigerator compartment temperature detection element 18 is an element that detects the temperature inside the refrigerator compartment 1, and outputs the detection result as an analog temperature detection signal. Furthermore, the freezer compartment temperature detection element 19 is adapted to detect the temperature within the freezing compartment 2 in the same manner as the refrigerator compartment temperature detection element 18.

The temperature control circuit 16 includes an input/output circuit (A/D
converter, D/A converter), etc., and a microcomputer (hereinafter referred to as microcomputer) 20. The microcomputer 20 includes a timer (not shown), a CPU, a ROM, a memory 21 consisting of a RAM, etc., and is configured to perform arithmetic processing on the signals supplied from each of the elements 17 to 19.

The microcomputer 20 maintains the temperatures of the refrigerator compartment 1 and the freezer compartment 2 at target temperatures based on the temperatures (temperature detection signals) detected by the refrigerator compartment temperature detection element 18 and the freezer compartment temperature detection element 19. Additionally, the operating time of the fan motor 9, compressor 10, and damper 13 is controlled, and it functions as a temperature control means.

The microcomputer 20 also controls the door opening/closing detection element 1.
The number of high-level periods of the door opening/closing signal from door 7 to door 3 and 6.
The number of openings and closings N is recognized as the number of openings and closings, and the number of openings and closings N is stored in the memory 21 for each predetermined time period as described later, and the time period in which the number of openings and closings N is large is set as a high opening and closing frequency time period. 21, and has a function as a high opening/closing frequency time zone setting means.

[0027] When the refrigerator-freezer is operating, the microcomputer 20 selects the preset high opening/closing frequency time period as described above and the previous time period, for example, two hours before, as the low temperature control time period. , the ON/OFF time of the fan motor 9 and the compressor 10 and the opening/closing time of the damper 13 are controlled so that the temperature of the refrigerator compartment 1 and the freezer compartment 2 is lowered by a preset temperature from the target temperature. It is designed to perform control and has a function as a low temperature control means. Note that normal temperature control is not performed while low temperature control is being performed. Further, the above control is performed according to a program stored in the ROM.

The above-mentioned high opening/closing frequency time period is determined based on whether the number of openings/closings N exceeds a predetermined reference number N0. In addition, the reference number of times N0 is the time when the temperature of the refrigerator compartment 1 and the freezer compartment 2, which increases with the opening and closing of the doors 3 and 6, reaches the upper limit of the guaranteed temperature at which food can be preserved well.
・The number of opening and closing times is set to 6. Note that the temperature rise due to opening and closing of the doors 3 and 6 is determined by the relationship between the average time required for one opening and closing and the number of openings and closings N. Therefore, when the number of openings and closings N exceeds the reference number of times N0, it is regarded as a high opening and closing frequency time period, and it is determined that the temperature of the refrigerator compartment 1 and the freezer compartment 2 during that time period exceeds the guaranteed temperature.

As shown in FIG. 3, the memory 21 as a storage means has opening/closing frequency areas T1 to T24 and a time period area T.
, a number of days area TW, a flag area F, and a high opening/closing frequency time zone area TH.

[0030] The opening/closing frequency areas T1 to T24 are for doors 3 and 6.
Divide the number of opening and closing times of the day into each hourly time period,
This is an area that accumulates and stores the number of openings and closings N for one week in each time period. The opening/closing frequency area T1 to T24 is, for example, the opening/closing frequency area T from 0 o'clock to 1 o'clock.
1, and thereafter the opening/closing frequency area T2 is assigned every hour.
~T24 is assigned.

The time zone area T is an area for storing the current time zone, and the value indicating the time zone is 1.
The count is increased by one each time the time elapses. The number of days area TW is an area for storing the current number of days, and the value indicating the current day is counted up by one each time one day passes. The flag area F stores a flag of "0" generated by the microcomputer 20 when storing the number of times of opening and closing, and stores a flag of "1" generated by the microcomputer 20 when one week's storage is completed. It is supposed to be done. The high opening/closing frequency time zone area TH is an area for storing a time zone set by the microcomputer 20 as a high opening/closing frequency time zone.

The procedure for controlling the temperature of the refrigerator compartment 1 and the freezer compartment 2 in the above configuration will be explained with reference to the flowchart of FIG.

First, the opening/closing frequency areas T1 to T24, the number of days area TW, and the flag area F are cleared, and the memory 21 is initialized by setting the contents of the time zone area T to 1 (S1), and the flag in the flag area F is cleared. It is determined whether it is "1" (S2). At this point, memory 2
1 stores the number of openings and closings N, and the flag area F is "0", so in this case, normal temperature control is performed (S3) and it is determined whether doors 3 and 6 are opened or not. (S4)
.

When it is determined that the doors 3 and 6 are opened based on the door opening and closing signal from the door opening and closing detection element 17, the number of openings and closings N in the opening and closing frequency ranges T1 to T24 is increased by 1 each time the doors 3 and 6 are opened.
It is counted up one hour at a time (S5), and it is determined whether one hour has passed (S6). Also, in S4, door 3
- If it is determined that 6 is not open, the process moves to S6.

In S6, if it is not determined that one hour has elapsed, the processes in S3 to S5 are repeated again, and
If it is determined that the time has elapsed, the time period stored in the time period area T is counted up by one (S7).
. At this time, the content of the time zone area T is changed to 1 when it reaches 25 and one day has passed, and the content of the number of days area TW is changed to 1.
becomes. Next, it is determined whether one week has passed (S8
), if the time has not passed, repeat the process of S3 to S7, and if the time has passed, set the flag in the flag area F to "1".
” (S9).

A high opening/closing frequency time period is set by determining whether or not the number of times N of opening/closing in each time period for one week accumulated through the above processing is greater than the reference number of times N0 (S10). This high opening/closing frequency time zone is stored in the high opening/closing frequency time zone area TH. After that, the process returns to S2.

Further, in S2, if it is determined that the flag in the flag area F is "1", the current time zone is a high opening/closing frequency time zone or a time zone 2 hours before that time zone.
That is, it is determined whether or not it is the low temperature control time period (S1
1). In S11, if it is determined that the current time period is the low temperature control time period, the fan motor 9 and the compressor 10
and operates the damper 13 to perform low temperature control (S12
). For example, if the hours from 3:00 to 5:00 and the hours from 1:00 to 14:00 are set as high opening/closing frequency hours, the hours from 1:00 to 5:00 and the hours from 11:00 to 14:00 are Low temperature control will be carried out until

On the other hand, if it is not determined in S11 that the current time period is a low temperature control time period, normal temperature control is performed (S13). Then, the determination in S11 is repeated for each time period, and one of the processes in S12 and S13 is performed.

As described above, in this embodiment, low temperature control is performed continuously from the time period before entering the high opening/closing frequency time period so that the temperature of the refrigerator compartment 1 and the freezer compartment 2 is lower than the target temperature. Therefore, it is possible to suppress the temperature rise in the refrigerator compartment 1 and the freezer compartment 2 during the high opening/closing frequency time period.

Next, FIG. 4 shows a second embodiment of the present invention.
The explanation will be as follows based on FIG. 7. Note that the same reference numerals are added to components having the same functions as those in the first embodiment.

The refrigerator-freezer according to this embodiment has the same structure as that of the previous embodiment shown in FIG. 4, but the function of the temperature control section is different from that shown in FIG. 2.

As shown in FIG. 6, the temperature control section has a temperature control circuit 22. As shown in FIG. A door opening/closing detection element 17 is connected to this temperature control circuit 22, and a compressor 10 and a defrosting heater 11 as a defrosting means are connected to the output side. The temperature control circuit 22 is made up of an input/output circuit, etc. and a microcomputer 23, and the defrosting heater 11 is configured to defrost the evaporator 7 during the low opening/closing frequency period when the doors 3 and 6 are opened/closing less frequently. It is designed to control ON/OFF of.

The microcomputer 23, like the aforementioned microcomputer 20 (see FIG. 2), stores in the memory 24 the number of openings and closings N of 3.6 determined by the door opening/closing signal from the door opening/closing detection element 17, and A time zone in which the number of openings and closings N is small is set as a low opening/closing frequency time zone and is stored in the memory 24, and has a function as a low opening/closing frequency time zone setting means.

Furthermore, the microcomputer 23 determines that the cumulative operating time of the compressor 10 during the low opening/closing frequency time period is a predetermined period of time, for example 6.
If the defrosting time is longer than that, the defrosting heater 11 is turned on and has a function as a defrosting control means. This is to avoid the waste of always defrosting when it is not necessary during low opening/closing frequency hours, and to perform defrosting according to the cooling time. The above control is
This is performed according to a program stored in a ROM (not shown).

The above-mentioned low opening/closing frequency time period is determined based on whether the number of openings/closings N is less than a predetermined reference number of times N0'. In addition, the standard number of times N0' is a guarantee that the temperature of the refrigerator compartment 1 and the freezer compartment 2, which includes the temperature increase due to defrosting and the temperature increase due to opening and closing of doors 3 and 6, can maintain food preservation well. Doors 3 and 6 when the temperature reaches the upper limit
The number of opening and closing times is set. Note that the temperature rise due to opening and closing of the doors 3 and 6 is determined by the relationship between the average time required for one opening and closing and the number of openings and closings N. Therefore, when the number of openings and closings N is less than the standard number of times N0', it is considered to be a low opening and closing frequency time period, and the temperature of the refrigerator compartment 1 and freezer compartment 2 during that time period exceeds the guaranteed temperature even if defrosting is performed. It is determined that there is no such thing.

As shown in FIG. 7, the memory 24 as a storage means has almost the same structure as the memory 21, but includes a low switching frequency time zone TL instead of the high switching frequency time zone TH described above. In addition, the compressor operating time region Tc
It is equipped with The low switching frequency time zone TL is an area for storing the time zone set as a low switching frequency time zone by the microcomputer 23, and the compressor operating time zone Tc is an integrated value of the time during which the compressor 10 operates. This is an area for storing.

FIG. 5 shows the defrosting control procedure in the above configuration.
This will be explained with reference to the flowchart. Note that the same step numbers will be used for the same processing procedures as those according to the configuration of the above-described embodiment shown in FIG. 1, and the explanation will be simplified.

First, the memory 21 is initialized (S1
), determines whether the flag in flag area F is "1" (S2), and determines whether doors 3 and 6 are open (S
4). When the doors 3 and 6 are opened, each time the doors 3 and 6 are opened, the number of openings and closings N in the number of openings and closings areas T1 to T24 is counted up by one (S5), and it is determined whether one hour has passed or not. Determination is made (S6). Further, if the doors 3 and 6 are not open, the process moves to S6.

If it is not determined in S6 that one hour has elapsed, the processing in S4 and S5 is repeated again, while if it is determined that one hour has elapsed, the contents of the time zone area T are counted up by one. (S7). Then, it is determined whether one week has passed (S8), and if it has not passed, S
4 to S7 are repeated. On the other hand, if it is determined in S8 that one week has passed, the flag in flag area F is set to "1" (S9).

A low opening/closing frequency time period is set by determining whether the number of openings/closings N for each time period for one week accumulated through the above processing is greater than the reference number of times N0' (S14). This low opening/closing frequency time slot is stored in the low opening/closing frequency time slot area TL. After that, the process returns to S2.

Further, in S2, if it is determined that the flag in the flag area F is "1", the integrated value TON of the operating time of the compressor 10 is 6 hours stored in the compressor operating time area Tc. (h) Determine whether or not it is greater than or equal to (
S15). In S15, if it is determined that the integrated value TON is 6 hours or more, it is further determined that the current time period is door 3.
6, it is determined whether or not it is a low opening/closing frequency time period where the opening/closing frequency is low (S16).

[0052] If it is not determined in S15 that the operating time of the compressor 9 is 6 hours or more, and if it is not determined in S16 that the current time period is a low opening/closing frequency time period, the process returns to S2 and the removal is performed. Do not frost. On the other hand, S1
If it is determined in step 6 that the current time zone is a low opening/closing frequency time zone, the defrosting heater 10 is turned on to perform defrosting for a certain period of time (S17).

[0053] While defrosting is being performed, cooling is stopped and the compressor 10 is turned off. However, when defrosting is completed, cooling is resumed, so the compressor 10 is turned on. Accumulation of operation time will begin anew. And S15.1
The determination in step 6 is repeated for each time period, and if the conditions are met, defrosting is performed.

As described above, in this embodiment, defrosting is performed during the time period when the opening/closing frequency is low, so defrosting is not performed during the time period when the opening/closing frequency of the doors 3 and 6 is high, and the refrigerator compartments 1 and 6 are The temperature rise in the freezer compartment 2 can be suppressed.

In addition, in the first and second embodiments, the high opening/closing frequency time period and the low opening/closing frequency time period are set based on the actually determined number of times N of opening/closing. It is possible to control the temperature of the refrigerator-freezer.

[0056]

[Effects of the Invention] The refrigerator-freezer according to claim 1 of the present invention has the following features:
An opening/closing detection means for detecting opening/closing of a door; a storage means for dividing one day into a plurality of time periods and storing the number of openings/closings of the door detected by the opening/closing detection means for each time period; and this storage means. a high opening/closing frequency time zone setting means for setting a time zone in which the number of openings/closings in each time zone stored in the memory is greater than a predetermined reference number of times as a high opening/closing frequency time zone; This configuration includes a low temperature control means that operates the temperature control means so that the temperature inside the refrigerator becomes lower than the target temperature during the period.

[0057] As a result, low temperature control is performed so that the temperature inside the refrigerator is lower than the target temperature continuously from the time period before the time period when the door is frequently opened and closed, so that the temperature inside the refrigerator is controlled to be lower than the target temperature. It is possible to suppress the temperature rise inside the refrigerator.

Further, the refrigerator-freezer according to claim 2 includes an opening/closing detection means for detecting opening/closing of the door, and the number of opening/closing of the door detected by the opening/closing detection means is divided into a plurality of time periods in one day. A storage means for storing information for each time period, and a low opening/closing frequency time zone setting for setting a time period in which the number of openings and closings in each time period stored in the storage means is less than a predetermined reference number of times as a low opening/closing frequency time zone. and a defrosting control means for operating the defrosting means during the low opening/closing frequency time period.

[0059] As a result, defrosting is performed during a time period when the opening/closing frequency is low, so it is possible to avoid defrosting during a time period when the opening/closing frequency is high, thereby suppressing a rise in temperature inside the refrigerator.

Furthermore, in the refrigerator-freezer according to claims 1 and 2, the high opening/closing frequency time period and the low opening/closing frequency time period are set based on the actually determined number of opening/closing times of the door. The temperature of the refrigerator/freezer can be controlled accordingly.

As described above, according to the refrigerator-freezer of the present invention, the temperature rise inside the refrigerator due to frequent opening and closing of the door and the temperature rise inside the refrigerator due to frequent opening and closing of the door and defrosting performed at the same time can be reduced. It has the effect of being able to significantly suppress the amount of food and preserve food in good condition for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a temperature control procedure in a refrigerator-freezer according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a temperature control section in the refrigerator-freezer according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a storage area of a memory in the temperature control section of FIG. 2;

FIG. 4 is a longitudinal sectional view showing the structure of a refrigerator-freezer according to a first embodiment and a second embodiment of the present invention.

FIG. 5 is a flowchart showing a defrosting control procedure in a refrigerator-freezer according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of a temperature control section in a refrigerator-freezer according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a storage area of a memory in the temperature control section of FIG. 6;

FIG. 8 is a waveform diagram showing the relationship between opening and closing of the door of a conventional refrigerator-freezer and temperature rise inside the refrigerator.

FIG. 9 is a waveform diagram showing the relationship between opening and closing of the door and temperature rise inside the refrigerator during defrosting of a conventional refrigerator-freezer.

[Explanation of symbols]

1 Refrigerator room 2 Freezer room 3, 6 Door 7 Evaporator 8 Blow fan 9 Fan motor 10 Compressor 11 Defrost heater (defrost means) 12
Introduction passage 13 Damper 17 Door opening/closing detection element (opening/closing detection means)
20 Microcomputer (temperature control means, high switching frequency setting means, low temperature control means) 21・24 Memory (storage means) 23 Microcomputer (low switching frequency setting means, defrosting control means)

Claims (2)

[Claims] Claim 1: A refrigerator-freezer equipped with a temperature control means for controlling the temperature inside the refrigerator, an opening/closing detection means for detecting opening/closing of a door, and a number of opening/closing times of the door detected by the opening/closing detection means per day. storage means that divides into multiple time periods and stores them for each time period, and a high opening/closing device that sets a time period in which the number of openings and closings stored in this storage means is greater than a predetermined reference number of times as a high opening/closing frequency time period. A frequency time zone setting means, and a low temperature control means for operating the temperature control means so that the temperature inside the refrigerator becomes lower than the target temperature during the high opening/closing frequency time zone and a predetermined period before that. A refrigerator-freezer featuring 2. A refrigerator-freezer equipped with a defrosting means for removing frost generated in an evaporator for evaporating refrigerant, comprising: an opening/closing detection means for detecting opening/closing of a door; and an opening/closing detection means for detecting opening/closing of a door; A storage means that divides a day into a plurality of time periods and stores the number of openings and closings for each time period, and a time period in which the number of openings and closings stored in this storage means is less than a predetermined reference number of times is defined as a low opening/closing frequency time. A refrigerator-freezer comprising: a low opening/closing frequency time zone setting means for setting a low opening/closing frequency time zone; and a defrosting control means for operating the defrosting means during the low opening/closing frequency time zone.