WO2018070089A1

WO2018070089A1 - Refrigerator

Info

Publication number: WO2018070089A1
Application number: PCT/JP2017/026793
Authority: WO
Inventors: 修平川本; 啓順元井; 萌子中田
Original assignee: 東芝ライフスタイル株式会社
Priority date: 2016-10-13
Filing date: 2017-07-25
Publication date: 2018-04-19
Also published as: JP2018063078A; JP6767838B2; CN109844431B; CN109844431A

Abstract

A refrigerator (1) comprises a freezer compartment (3) and a refrigeration compartment (4) and is not provided with a damper mechanism which, while both the freezer compartment (3) and the refrigeration compartment (4) are refrigerated by cold air generated by one evaporator (9), adjusts the distribution of cold air to the freezer compartment(3) and the refrigeration compartment (4). The refrigerator (1) comprises a compressor (8) connected to the evaporator (9) and a refrigeration compartment temperature sensor (14) (refrigeration compartment temperature detection unit) for detecting the temperature of the refrigeration compartment (4). Upon the temperature of the refrigeration compartment (4) detected by the refrigeration compartment temperature sensor (14) reaching the upper limit temperature of a predetermined target temperature range, a control unit (11) of the refrigerator (1) operates the compressor (8) and upon the temperature of the refrigeration compartment (4) reaching the lower limit of the target temperature range, halts the compressor (8) and changes the target temperature range to the low temperature side on the basis of the operating state of the compressor (8).

Description

refrigerator

Embodiment of this invention is related with a refrigerator.

Conventionally, a refrigerator that performs cooling based on the temperature of a refrigerator compartment detected by a temperature sensor provided in the refrigerator compartment without providing a damper for adjusting the distribution of the cold air to the refrigerator compartment and the freezer compartment, mainly for the purpose of reducing manufacturing costs. There is. In the case of such a refrigerator, a temperature sensor must be provided in the refrigerator compartment in order to prevent the food stored in the refrigerator compartment from freezing. When the temperature difference from (outside temperature) is small, the number of cooling operations is reduced. That is, when cooling is performed based on the temperature of the refrigerator compartment, the number of cooling operations may be reduced and the freezer compartment may become insufficiently cooled.

For this reason, it has been proposed to separately provide a heater for heating the temperature sensor of the refrigerator compartment and a sensor for detecting the outside air temperature, and to solve the lack of cooling of the freezer compartment by increasing the number of cooling operations (for example, Patent Documents). 1 and 2).

JP-A-5-71846 Japanese Patent Laying-Open No. 2015-169376

However, when a heater or a sensor for detecting the outside air temperature is provided, the manufacturing cost increases because parts are added. In addition, for example, when a sensor for detecting the outside air temperature is provided, it is expected that the variation in the detected temperature due to the ambient temperature is relatively large, and there is a problem that the mounting position of the outside air temperature detecting sensor is limited. Therefore, an object of the present invention is to provide a refrigerator that can be suitably cooled based on the temperature of the refrigerator compartment without increasing the manufacturing cost.

The refrigerator according to the embodiment has a freezing room and a refrigerating room, and cools both the freezing room and the refrigerating room with cold air generated by one evaporator, and adjusts the distribution of the cold air to the freezing room and the refrigerating room. The refrigerator is configured not to have a mechanism, and has a compressor connected to the evaporator, and a refrigerator temperature detector that detects the temperature of the refrigerator, and the refrigerator compartment detected by the refrigerator temperature detector When the temperature reaches the upper limit of the predetermined target temperature range, the compressor is operated, and when the temperature of the refrigerator compartment reaches the lower limit temperature of the target temperature range, the compressor is stopped and the compressor is operated. And a control unit that changes the target temperature range to a low temperature side.

Thus, in a refrigerator having a configuration that cools both the freezing room and the refrigerating room with the cold air generated by one evaporator but does not have a damper mechanism for adjusting the distribution of the cold air to the freezing room and the refrigerating room, the manufacturing cost is reduced. A refrigerator that can be suitably cooled based on the temperature of the refrigerator compartment can be obtained without causing an increase in the temperature.

The figure which shows typically the structure of the refrigerator of 1st Embodiment. The figure which shows typically the electric constitution of a refrigerator. The figure which is a comparative example and shows an example of the temperature change when not changing the target temperature range. The figure which shows the flow of the change process of a target temperature range. The figure which shows an example of the temperature change at the time of performing the change process of a target temperature range. The figure which shows the flow of the change process of the target temperature range by 2nd Embodiment. The figure which shows an example of the temperature change at the time of performing the change process of a target temperature range. The figure which shows the flow of the change process of the target temperature range by 3rd Embodiment. The figure which shows an example of the temperature change at the time of performing the change process of a target temperature range. The figure which shows typically the structure of the refrigerator by other embodiment.

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the site | part substantially common in each embodiment. (First embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 5. As shown in FIG. 1, the refrigerator 1 has a freezer compartment 3 on the upper side of the main body 2 and a refrigerator compartment 4 on the lower side. The freezer compartment 3 is open on the front side, and the opening is opened and closed by a door 3a. On the other hand, the refrigerator compartment 4 has an opening on the front side, and the opening is opened and closed by a door 4a.

The freezer compartment 3 and the refrigerator compartment 4 are partitioned by a heat insulating partition 5, and the heat insulating partition 5 is provided with a cold air suction port 6 from the refrigerator compartment 4 side. The cold air supplied into the refrigerator compartment 4 via the cold air duct 7 disposed on the back side of the main body 2 is sucked out from the suction port 6 and circulates in the refrigerator 1. This cold air is generated by a refrigeration cycle including a compressor 8 installed in a machine room formed on the back side of the lower part of the main body 2 and an evaporator 9 installed in a cooling room on the back side of the upper part of the main body 2.

More specifically, the refrigerator 1 generates cold air in the evaporator 9 by driving the compressor 8, and drives the fan 10 provided in the vicinity of the evaporator 9 to drive the freezer compartment 3 and the refrigerator compartment. 4 is supplied with cold air. At this time, the cold air supplied to the refrigerator compartment 4 is sucked out from the suction port 6, reaches the cooling compartment, and is cooled again by the evaporator 9. Thus, in the refrigerator 1, both the freezer compartment 3 and the refrigerator compartment 4 are cooled by circulating the cool air produced | generated with the one evaporator 9. FIG. However, since the refrigerator 1 does not include a so-called damper mechanism for adjusting the distribution of the generated cold air to the freezer compartment 3 and the refrigerator compartment 4, only the freezer compartment 3 is not cooled alone. When the compressor 8 is stopped, the cooling of both the freezer compartment 3 and the refrigerator compartment 4 is stopped.

The entire refrigerator 1 including the compressor 8 is controlled by a control unit 11 provided in a control room on the back side of the main body 2. The control unit 11 is composed of a microcomputer having a CPU or the like (not shown), and is connected to the storage unit 12 and the timer 13 as shown in FIG. The storage unit 12 is configured by, for example, a semiconductor memory, and stores various programs and data executed by the control unit 11 such as a target temperature range changing process described later. The timer 13 has a time measuring function that makes it possible to acquire time and to acquire a period elapsed from a certain time. The control unit 11 may be configured using a so-called one-chip microcomputer in which the storage unit 12 and the timer 13 are built.

Further, the control unit 11 is connected to the compressor 8, the fan 10, the refrigerating room temperature sensor 14 as the refrigerating room temperature detecting unit, the refrigerating room door switch 15, and the freezer room door switch 16. The refrigerating room temperature sensor 14 is provided in the refrigerating room 4 as shown in FIG. 1, and detects the temperature of the refrigerating room 4 (hereinafter also referred to as a refrigerating room temperature (Tr)). Based on the refrigerator compartment temperature (Tr) detected by the refrigerator compartment temperature sensor 14, the controller 11 controls the operation of the compressor 8.

Specifically, when the refrigerator compartment temperature (Tr) reaches the upper limit temperature (Tr−H, see FIG. 3) within a predetermined target temperature range (ΔTr, see FIG. 3), the control unit 11 When the refrigerator compartment temperature (Tr) reaches the lower limit temperature (Tr-L, see FIG. 3) of the target temperature range, the compressor 8 is stopped. Moreover, although mentioned later for details, the control part 11 performs the change process (refer FIG. 4) which changes a target temperature range to the low temperature side based on the operating condition of the compressor 8. FIG.

The refrigerator compartment door switch 15 detects the open / closed state of the door 4a of the refrigerator compartment 4. The freezer compartment door switch 16 detects the open / closed state of the door 3 a of the freezer compartment 3. The freezer compartment door switch 16 corresponds to an open / close detection unit. In addition, although illustration is abbreviate | omitted, the control part 11 is connected to the function part required for operation | movement of the refrigerator 1 other than each function part shown in FIG.

Next, the operation of the above configuration will be described. First, a basic control flow of the refrigerator 1 and an example of changes in the freezer compartment 3 and the refrigerator compartment temperature (Tr) when the target temperature range changing process described later is not performed will be described with reference to FIG. To do. As shown in FIG. 3, a target temperature range (ΔTr) for the refrigerator compartment 4 and a target temperature range (ΔTf) for the freezer compartment 3 are set in the refrigerator 1.

Note that, as an example, in the initial state, that is, in the state where the change process described later is not performed, the target temperature range (ΔTr) of the refrigerator compartment 4 has an upper limit temperature (Tr−H) of 6 ° C. and a lower limit temperature ( Tr−L) is set to 2 ° C., and the temperature difference is set to 4 ° C. The target temperature range (ΔTf) for the freezer compartment 3 is set such that the upper limit temperature (Tf−H) is −11 ° C., the lower limit temperature (Tf−L) is −13 ° C., and the temperature difference is 2 ° C. Is done.

In this case, the temperature in the freezer compartment (Tr) falls within the target temperature range (ΔTr), and the temperature of the freezer compartment 3 (hereinafter also referred to as the freezer compartment temperature (Tf)) falls within the target temperature range (ΔTf). It is desirable to cool to fit. Therefore, as shown in the graph G1r, the control unit 11 assumes that the refrigerating room temperature (Tr) rises and reaches the upper limit temperature (Tr−H) of the target temperature range (ΔTr) at time (t2), for example. Then, the operation of the compressor 8 is started. Hereinafter, the state in which the compressor 8 is operating is also simply referred to as “operation”. Thereby, cold air is generated in the evaporator 9, and the cold air circulates in the refrigerator 1, thereby cooling the refrigerator compartment 4 and the refrigerator compartment 4. During the operation of the compressor 8, the fan 10 is also operated.

On the other hand, the control unit 11 causes the refrigerator temperature (Tr) to decrease due to the operation of the compressor 8, and reaches, for example, the lower limit temperature (Tr−H) of the target temperature range (ΔTr) at time (t3). If it does, since the further cooling is unnecessary, operation | movement of the compressor 8 is complete | finished. Hereinafter, the state where the compressor 8 is not operating is also simply referred to as “stop”. At this time, the fan 10 also stops.

That is, the upper limit temperature (Tr−H) of the target temperature range (ΔTr) of the refrigerator compartment 4 is a temperature for determining whether or not to operate the compressor 8, and the lower limit temperature (Tr−L) is the compressor. 8 is a temperature for determining whether to stop 8 or not. More precisely, based on the refrigerator compartment temperature (Tr), the control unit 11 determines whether or not the refrigerator compartment temperature (Tr) has reached the upper limit temperature (Tr-H) or the lower limit temperature (Tr-L). Based on this, the operation of the compressor 8 is controlled.

By the way, when the operation of the compressor 8 is controlled based on the refrigerator compartment temperature (Tr), the situation where the freezer compartment temperature (Tf) exceeds the target temperature range (ΔTf), that is, the freezer compartment 3 is appropriately set. Situations that cannot be cooled down can occur. For example, as shown in the graph G1f, even if the freezer temperature (Tf) reaches the upper limit temperature (Tf−H) at the time (t1) before the time (t2), the refrigerator compartment at that time Since the temperature (Tr) does not reach the upper limit temperature (Tr-H), the compressor 8 is not operated. If the compressor 8 is not operated, neither the freezer compartment 3 nor the refrigerating compartment 4 is cooled. Therefore, it is assumed that the freezer compartment temperature (Tf) exceeds the upper limit temperature (Tf−H) and further rises.

Alternatively, when the room temperature is relatively low, the temperature difference from the refrigerating room temperature (Tr) is small, so that the increase in the refrigerating room temperature (Tr) after the operation of the compressor 8 is stopped, for example, after time (t3) is moderate. become. In this case, the time until the refrigerator compartment temperature (Tr) reaches the upper limit temperature (Tr−H), that is, the period during which the compressor 8 is stopped becomes longer. Then, since the compressor 8 remains stopped, cooling is not performed, and even if the freezer compartment temperature (Tf) reaches the upper limit temperature (Tf−H) at the time (t4), for example, it continues to rise. The situation is also envisaged.

Thus, when controlling the operation of the compressor 8 based on the refrigerating room temperature (Tr) in the refrigerator 1 that does not include the damper mechanism for adjusting the distribution of the cold air, in other words, the freezing room temperature (Tf) is set. In the case of a configuration in which a sensor that directly detects is not provided, even if the refrigerator compartment temperature (Tr) can be within the target temperature range (ΔTr), the freezer compartment temperature (Tf) is set to the target temperature range (ΔTf). There is a possibility that it cannot fit in.

In such a case, the freezer compartment 3 is appropriately provided by providing a temperature sensor in the freezer compartment 3, a heater for heating the refrigerator compartment temperature sensor 14, or a temperature sensor for detecting the room temperature. It is thought that it can be cooled. In this case, however, the manufacturing cost increases because additional parts are required. Further, if heating means such as a heater is provided, the power consumption is also increased.

Therefore, the refrigerator 1 of the present embodiment can appropriately control the operation of the compressor 8 based on the refrigerator compartment temperature (Tr). Hereinafter, an example of the temperature change when the target temperature range changing process and the target temperature range changing process repeatedly executed by the control unit 11 are performed will be described with reference to FIGS. 4 and 5.

In the changing process shown in FIG. 4, the control unit 11 determines whether or not the refrigerator temperature (Tr) has reached the upper limit temperature (Tr-H) (S1), and the upper limit temperature (Tr-H) is reached. When it is determined that it has reached (S1: YES), the compressor 8 is operated as described above (S2). On the other hand, when it is determined that the upper limit temperature (Tr−H) has not been reached (S1: NO), the control unit 11 proceeds to step S3.

In step S3, the control unit 11 determines whether or not the refrigerator temperature (Tr) has reached the lower limit temperature (Tr-L) (S3), and has reached the lower limit temperature (Tr-L). If it is determined that it is not (S3: NO), the process returns to step S1. On the other hand, when it is determined that the lower limit temperature (Tr-L) has been reached (S3: YES), the control unit 11 stops the compressor 8 (S4). Here, it is assumed that the compressor 8 is stopped at the time (ts) shown in FIG.

When the compressor 8 is stopped, the control unit 11 initializes the change of the target temperature range (ΔTr) of the refrigerator compartment 4 (S5). Although the change of the target temperature range (ΔTr) will be described below, since the control unit 11 repeatedly executes the change process as described above, the target temperature range (ΔTr) is changed in the previous process. If so, the change is initialized in step S5.

Subsequently, the control unit 11 determines whether or not the standby period has elapsed since the compressor 8 was stopped in step S4 (S6). In this standby period, for example, a temperature change of the refrigerator compartment 4 when the room temperature is 25 ° C. is obtained in advance by a test, and a period of, for example, 10 minutes is set as an initial value based on the temperature change.

When it is determined that the standby period has not elapsed (S6: NO), the controller 11 determines whether or not the refrigerating room temperature (Tr) has reached the upper limit temperature (Tr−H) (S9). . For example, when the outside air temperature (Te) rises at time (t17) shown in FIG. 5 and the compressor 8 stops at time (t18), the refrigerator temperature (Tr) at time (t19) before the standby period elapses. Is assumed to reach the upper limit temperature (Tr-H). That is, even during the standby period, a situation in which the refrigerator temperature (Tr) reaches the upper limit temperature (Tr−H) may occur.

Therefore, the control unit 11 performs the determination in step S9 so that the compressor 8 can be operated without waiting for the standby period to elapse. As a result, the situation where the freezer temperature (Tf) exceeds the upper limit temperature (Tf−H) as shown in the graph G13f as a result of simply waiting until the standby period elapses is suppressed. it can.

On the other hand, when it is determined that the standby period has elapsed (S6: YES), the control unit 11 changes the target temperature range (ΔTr) to the low temperature side for each unit period (S7). In this state, since the compressor 8 is stopped, the refrigerator temperature (Tr) gradually increases. Therefore, the control unit 11 determines whether or not the refrigerator compartment temperature (Tr) has reached the upper limit temperature (Tr-H) (S8), and determines that the upper limit temperature (Tr-H) has not been reached. (S8: NO), the process proceeds to step S7. At this time, the control unit 11 maintains a state where the compressor 8 is stopped.

And if it transfers to step S7, the control part 11 will change a target temperature range ((DELTA) Tr) to the low temperature side for every unit period. That is, for example, if the standby period has elapsed at time (t10) shown in FIG. 5, the control unit 11 corresponds to the period elapsed from time (t10), that is, the difference (tn) from the current time (tn). According to -t10), the target temperature range (ΔTr) is gradually changed to the low temperature side.

That is, the control unit 11 acquires an elapsed period that is a period that has elapsed since the compressor 8 was stopped as the operating state of the compressor 8, and the amount of change in the target temperature range (ΔTr) increases as the acquired elapsed period becomes longer. Has increased. Further, the control unit 11 changes the target temperature range (ΔTr) to the low temperature side by changing both the upper limit temperature (Tr−H) and the lower limit temperature (Tr−L) to the low temperature side. Thereby, compared with the case where the target temperature range (ΔTr) is not changed, the timing at which the operation of the compressor 8 is started can be advanced.

Subsequently, in step S8, the control unit 11 determines again whether or not the refrigerating room temperature (Tr) has reached the upper limit temperature (Tr-H), and determines that the upper limit temperature (Tr-H) has not been reached. If so (S8: NO), the process returns to step S7 to repeat changing the target temperature range (ΔTr) to the low temperature side.

Assuming that the refrigerating room temperature (Tr) reaches the changed upper limit temperature (Tr−H) at the time (t11) shown in FIG. 5, the control unit 11 sets the refrigerating room temperature (Tr) to the upper limit temperature (Tr) in step S8. Since it is determined that it has reached (Tr−H) (S8: YES), the compressor 8 is operated (S2). Thereby, cooling of the refrigerator compartment 4 and the freezer compartment 3 is performed.

On the other hand, if the process of changing the target temperature range (ΔTr) of the refrigerator compartment 4 to the low temperature side is not performed, the refrigerator compartment temperature (Tr) is virtually shown by a broken line graph G11r in FIG. The upper limit temperature (Tr−H) is reached at time (t12). However, in that case, there is a possibility that the freezer compartment temperature (Tf) may exceed the upper limit temperature (Tf−H), as virtually indicated by the broken line graph G11f.

Further, if only the upper limit temperature (Tr−H) of the target temperature range (ΔTr) of the refrigerator compartment 4 is changed to the low temperature side, the cooling stops at the time (t13) shown in FIG. The refrigerator compartment temperature (Tr) and the freezer compartment temperature (Tf) rise as virtually shown by the graphs G12r and G12f. At this time, if the freezer compartment 3 is not sufficiently cooled, the freezer compartment temperature (Tf) exceeds the upper limit temperature (Tf−H) before the refrigerator compartment temperature (Tr) reaches the upper limit temperature (Tr−H). There is a possibility that.

In contrast, when both the upper limit temperature (Tr-H) and the lower limit temperature (Tr-L) of the target temperature range (ΔTr) of the refrigerator compartment 4 are changed to the low temperature side as in the present embodiment, the time Since the cooling continues until (t14), the freezer compartment 3 can be sufficiently cooled, and the possibility that the freezer compartment temperature (Tf) exceeds the upper limit temperature (Tf−H) can be reduced.

Thereafter, the control unit 11 repeats the processing of steps S1 to S9 described above, and changes the target temperature range (ΔTr) when the standby period has elapsed at time (t15), for example, and the refrigerator temperature at time (t16). When (Tr) reaches the upper limit temperature (Tr-H), control such as operating the compressor 8 is repeated. As described above, in the refrigerator 1 according to the present embodiment, the operation of the compressor 8 is controlled based on the refrigerator temperature (tr), and the target temperature range is changed to the low temperature side based on the operation state of the compressor 8. Yes.

According to the embodiment described above, the following effects can be obtained. The refrigerator 1 according to the embodiment includes a freezing room 3 and a refrigerating room 4, and cools both the freezing room 3 and the refrigerating room 4 with the cold air generated by one evaporator 9, while the freezing room 3 and the refrigerating room 4 are moved to. There is no damper mechanism to adjust the distribution of cold air. The refrigerator 1 operates the compressor 8 when the refrigerator compartment temperature (Tr) detected by the refrigerator compartment temperature sensor 14 reaches the upper limit temperature (Tr−H) of the predetermined target temperature range (ΔTr), When the refrigerator temperature (Tr) reaches the lower limit temperature (Tr−L) of the target temperature range (ΔTr), the compressor 8 is stopped, and the target temperature range (ΔTr) is set to the low temperature side based on the operating state of the compressor 8. Change to

Thereby, the timing at which the operation of the compressor 8 is started can be advanced compared to the case where the target temperature range (ΔTr) is not changed. In other words, the operation interval of the compressor 8 can be shortened, that is, the period until the operation of the compressor 8 is restarted can be shortened. Since the freezer compartment 3 is cooled when the compressor 8 is operated, the freezer compartment temperature (Tf) may exceed the upper limit temperature (Tf−H), that is, the freezer compartment 3 is not sufficiently cooled. Can be reduced. Further, even if the damper mechanism is not provided, there is no need to provide a sensor for detecting the temperature of the freezer compartment 3. Therefore, cooling can be suitably performed based on the temperature of the refrigerator compartment 4 without causing an increase in manufacturing cost.

Further, the refrigerator 1 acquires an elapsed period that is a period that has elapsed since the compressor 8 was stopped as an operating state, and increases the change amount of the target temperature range (ΔTr) as the acquired elapsed period becomes longer. Thereby, the timing which restarts the driving | operation of the compressor 8 becomes earlier, so that the period which is not cooled from the compressor 8 being stopped becomes long. Therefore, the possibility that cooling of the freezer compartment 3 will be insufficient can be reduced.

Further, the refrigerator 1 initializes the target temperature range (ΔTr) when the operation of the compressor 8 is stopped. This prevents the target temperature range (ΔTr) from being changed to the low temperature side, thereby reducing the possibility of excessive cooling. Further, the refrigerator 1 starts changing the target temperature range (ΔTr) when a predetermined standby period has elapsed since the compressor 8 was stopped. Thus, it is possible to suppress the target temperature range (ΔTr) from being immediately changed to the low temperature side, and to reduce the possibility of excessive cooling.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIGS. 6 and 7. The second embodiment is different from the first embodiment in that the compressor 8 is controlled in consideration of the operation ratio of the compressor 8. In addition, since the structure of the refrigerator 1 is common in 1st Embodiment, it demonstrates, also referring FIG.

Refrigerator 1 of the second embodiment repeatedly executes the changing process shown in FIG. In the change process shown in FIG. 6, the same process as the change process (see FIG. 4) of the first embodiment is denoted by the same reference numeral, and detailed description thereof is omitted. As shown in FIG. 6, the change process of the second embodiment is a flow in which step S20 is added to the change process of the first embodiment.

Specifically, in the change process, the control unit 11 determines the operation and stop timing of the compressor 8 based on the refrigerator temperature (Tr) as in the first embodiment (S1 to S4). When the compressor 8 is stopped, it is determined whether the operation ratio exceeds the reference ratio (S20). Here, the operation ratio is a ratio of operating the compressor 8 during a preset ratio determination period. This ratio determination period is a predetermined period including a time point when the operation of the compressor 8 is stopped.

For example, as shown in FIG. 7, the compressor 8 is operated in a state where the target temperature range (ΔTr) is changed to the low temperature side before the time (t20), and the refrigerator temperature (Tr) shown by the graph G20r. Reaches the lower limit temperature (Tr-L) at time (t20), and the compressor 8 is stopped. At this time, the control unit 11 acquires the ratio of operating the compressor 8 from the time (t20) before the predetermined period as the operation ratio, and the acquired operation ratio exceeds a predetermined reference ratio. It is determined whether or not (S20). Note that the predetermined period and the reference ratio can be appropriately set, for example, by obtaining in advance by a test or the like.

When it is determined that the operation ratio exceeds the reference ratio (S20: YES), the control unit 11 initializes the change of the target temperature range (ΔTr) (S5). Then, similarly to the first embodiment, the control unit 11 determines whether or not the standby period has elapsed. For example, when the standby period has elapsed at time (t21), the control unit 11 sets the target temperature range (ΔTr). When the temperature is changed to the low temperature side and the refrigerator temperature (Tr) reaches the upper limit temperature (Tr−H) at time (t22), the operation of the compressor 8 is started.

On the other hand, when it is determined that the operation ratio does not exceed the reference ratio (S20: NO), the control unit 11 omits step S5, that is, changes the target temperature range (ΔTr). The process proceeds to step S6 without initialization. In this case, the target temperature range (ΔTr) is maintained at the low temperature side after time (t23). Now, the state that the operation ratio of the compressor 8 does not exceed the reference ratio means that the period during which the compressor 8 is stopped is relatively long. The long period during which the compressor 8 has been stopped indicates that the freezer compartment 3 may not be sufficiently cooled.

In such a situation, if the target temperature range (ΔTr) is initialized at time (t23), the refrigerating room temperature (Tr) is assumed to be, for example, thereafter as virtually indicated by a broken line graph G21r. The upper limit temperature (Tr-H) is reached at time (t25). However, when there is a possibility that the freezer compartment 3 is not sufficiently cooled as described above, the freezer compartment temperature (Tf) indicated by the graph G20f is indicated by the broken line graph G21f at the time (t25). As shown virtually, there is a high possibility that the upper limit temperature (Tf−H) will be exceeded.

Therefore, the control unit 11 initializes the target temperature range (ΔTr) when the operation ratio of the compressor 8 does not reach the reference value and the freezer compartment 3 may not be sufficiently cooled. do not do. As a result, the timing at which the refrigerating room temperature (Tr) reaches the upper limit temperature (Tr−H) is advanced, and for example, the time (t24) that is moved forward from the time (t25) when the target temperature range (ΔTr) is not initialized. ), The compressor 8 is operated.

Thereby, when the operation interval of the compressor 8 is shortened and the freezer compartment 3 may not be sufficiently cooled, the freezer compartment 3 can be cooled at an earlier timing. Therefore, as in the first embodiment, it is possible to obtain an effect that cooling can be suitably performed based on the temperature of the refrigerator compartment 4 without causing an increase in manufacturing cost.

In the above-described embodiment, an example in which it is determined whether or not the change of the target temperature range (ΔTr) is to be initialized according to the operation ratio of the compressor 8 has been described. However, the target temperature range (ΔTr) is initialized. However, the change amount of the target temperature range (ΔTr) in step S7 can be reduced according to the operation ratio of the compressor 8.

This can be estimated that the freezer compartment 3 is cooled to some extent when the operation ratio of the compressor 8 reaches the reference value. Therefore, if the amount of change of the target temperature range (ΔTr) is increased in a state where it is cooled to some extent, that is, if the target temperature range (ΔTr) is changed so that the operation interval of the compressor 8 becomes shorter, the freezer compartment 3 Is more likely to be cooled than necessary. Therefore, cooling can be suitably performed based on the temperature of the refrigerator compartment 4 even by a configuration in which the amount of change in the target temperature range (ΔTr) in step S7 is reduced in accordance with the operation ratio of the compressor 8.

(Third Embodiment) Hereinafter, the third embodiment will be described with reference to FIG. 8 and FIG. The third embodiment is different from the first embodiment in that the compressor 8 is controlled in consideration of the opening / closing state of the door 3a of the freezer compartment 3. In addition, since the structure of the refrigerator 1 is common in 1st Embodiment, it demonstrates, also referring FIG.

As shown in FIG. 8, in the changing process of the third embodiment, steps S30 and S31 are added to the changing process of the first embodiment. In this case, the controller 11 determines the operation and stop timing of the compressor 8 based on the refrigerator temperature (Tr) as in the first embodiment (S1 to S4), and stops the compressor 8. The target temperature range (ΔTr) is initialized.

Then, the controller 11 determines whether or not the number of times of opening and closing, which is the number of times the door 3a of the freezer compartment 3 is opened and closed, has reached a predetermined reference opening and closing number in a predetermined door opening determination period ( S30) and whether or not the opening period, which is the period during which the door 3a of the freezer compartment 3 is opened, has reached a predetermined reference opening period (S31). That is, the control unit 11 acquires the opening / closing status of the door 3 a of the freezer compartment 3.

As shown in FIG. 9, when the compressor 8 is operated at time (t30) and the compressor 8 is stopped at time (t31), the control unit 11 opens and closes a predetermined period in the past including the time (t31). As the determination period, the number of opening / closing operations and the opening period are determined. Note that the open / close determination period, the reference open / close count, and the reference open period can be appropriately set, for example, by obtaining in advance by a test or the like.

And when the control part 11 determines with the opening / closing frequency | count having reached the reference | standard opening / closing frequency | count (S30: YES), and when determining with the open period having reached | attained the reference | standard open | release period (S31: YES), step S6 is omitted, that is, the process proceeds to step S7 without waiting for the waiting period to elapse.

Generally, since the room temperature (Te) is higher than the freezer temperature (Tf), it is considered that the freezer temperature (Tf) increases when the door 3a of the freezer room 3 is opened. And it is thought that the increase amount of freezer compartment temperature (Tf) becomes so large that the frequency | count of opening and closing of the door 3a of the freezer compartment 3 is large, and the open period of the door 3a of the freezer compartment 3 is long.

On the other hand, in the case of the refrigerator compartment 4, if the door 4a is not opened and closed, it is considered that the amount of increase in the refrigerator compartment temperature (Tr) does not change greatly. Therefore, for example, after the operation of the compressor 8 is stopped at the time (t31), if the standby period has elapsed at the time (t33), the freezer compartment temperature (Tf) is virtually shown by a broken line graph G31f. ) Is likely to exceed the upper limit temperature (Tf-H).

Therefore, the control unit 11 acquires the opening / closing status of the door 3a of the freezer compartment 3, and controls the operation of the compressor based on the opening / closing status. Specifically, when the control unit 11 determines that the number of times of opening and closing has reached the reference number of times of opening and closing, and when it is determined that the opening period has reached the reference opening time, the elapse of the standby period The period until the compressor 8 is operated is shortened by starting the change of the target temperature range (ΔTr) immediately without waiting.

Thereby, since the compressor 8 is operated at an earlier timing than in the case of waiting for the standby period, the possibility that the freezer temperature (Tf) exceeds the upper limit temperature (Tf−H) can be reduced. . Therefore, as in the first embodiment, it is possible to obtain an effect that cooling can be suitably performed based on the temperature of the refrigerator compartment 4 without causing an increase in manufacturing cost.

In this case, it is also possible to select whether or not to wait for the standby time on the condition of either the number of opening / closing operations or the opening / closing period. Specifically, in the changing process shown in FIG. 8, it is possible to adopt a configuration in which either the opening / closing count condition (step S30) or the opening / closing period condition (step S31) is performed. Further, in addition to selecting whether or not to wait for the standby time, the amount of change of the target temperature range (ΔTr) in step S7 can be changed based on the number of opening / closing and the opening / closing period. In this case, since the temperature rise of the freezer compartment 3 is considered to be large if the number of times of opening and closing and the opening and closing period are large, the amount of change in the target temperature range (ΔTr) is increased as the number of times of opening and closing is increased or the opening and closing period is longer. It is possible. Of course, also in this case, one of the number of times of opening and closing or the opening and closing period can be used as a condition.

(Other embodiments)
The present invention is not limited to those exemplified in the above-described embodiment, and can be arbitrarily modified or expanded as follows, for example, without departing from the scope thereof. In each embodiment, the refrigerator 1 in which the freezer room 3 is arranged on the upper side in the main body 2 and the refrigeration room 4 is arranged on the lower side is illustrated. However, the change process shown in each embodiment is a lower part as shown in FIG. The present invention can also be applied to the refrigerator 20 in which the freezer compartment 3 is disposed on the side and the refrigerator compartment 4 is disposed on the upper side.

In each embodiment, when the target temperature range (ΔTr) is changed, both the upper limit temperature (Tr−H) and the lower limit temperature (Tr−L) are changed to the low temperature side. The target temperature range (ΔTr) can be changed by changing only H) to the low temperature side. Even when only the upper limit temperature (Tr-H) is changed, the operation timing of the compressor 8 can be advanced compared with the case where the upper limit temperature (Tr-H) is not changed, and the freezer compartment temperature (Tf) becomes the upper limit temperature (Tf-H). Can be reduced.

Further, although depending on the situation, the period during which the cooling is performed can be shortened by not changing the lower limit temperature (Tr-L). For example, when the change described in the second embodiment is not initialized. It is considered that the possibility of overcooling can be further reduced by changing only the upper limit temperature (Tr-H).

The first embodiment waits until the standby period elapses, and shows an example in which the target temperature range (ΔTr) is changed to the low temperature side according to the period elapsed from the time point (t10) when the standby period elapses. In step S7, the target temperature range (ΔTr) may be changed to the low temperature side in accordance with the elapsed period from the time point (ts) when the compressor 8 is stopped. Whether the elapsed time is calculated as (tn-t10) or (tn-ts), it is only necessary to change the coefficient for determining the change amount. This is because the amount is obtained. Even with such a configuration, cooling can be suitably performed based on the temperature of the refrigerator compartment 4.

In each embodiment, an example in which the target temperature range (ΔTr) is gradually changed to the low temperature side according to the length of the elapsed period has been shown. However, for example, after the standby period has elapsed, the target temperature range (ΔTr) is preset according to the length of the elapsed period It is also possible to change the target temperature range (ΔTr) up to the set temperature at a time. The numerical values such as the target temperature range and the standby period shown in each embodiment, the mode of the graph showing the temperature change, and the like are examples.

Each embodiment is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator 3 ... Freezing room 3a ... Door 4 ... Refrigeration room 8 ... Compressor 9 ... Evaporator 11 ... Control part 12 ... Memory | storage part 13 ... Timer 14 ... Refrigeration room temperature sensor (refrigeration room temperature detection part)
16 ... Freezer compartment door switch (open / close detector)
20 ... Refrigerator

Claims

A damper mechanism that has a freezing room and a refrigerating room, cools both the freezing room and the refrigerating room with cold air generated by one evaporator, and adjusts the distribution of the cold air to the freezing room and the refrigerating room, A refrigerator having a configuration not provided,
A compressor connected to the evaporator, and a refrigerator temperature detector for detecting the temperature of the refrigerator,
When the temperature of the refrigerating room detected by the refrigerating room temperature detection unit reaches the upper limit temperature of a predetermined target temperature range, the compressor is operated, and the temperature of the refrigerating room becomes the lower limit temperature of the target temperature range. And a control unit that stops the compressor when reaching and changes the target temperature range to a low temperature side based on an operating state of the compressor.
The said control part acquires the elapsed period which is the period which passed since the said compressor was stopped as the said operating condition, and makes the change amount of the said target temperature range large, so that the acquired said elapsed period becomes long. Refrigerator.
The control unit acquires an operation ratio that is a ratio of operating the compressor during a ratio determination period that is set in advance as the operation status, and the amount of change in the target temperature range increases as the acquired operation ratio increases. The refrigerator of Claim 1 which makes small.
The refrigerator according to any one of claims 1 to 3, wherein the control unit initializes the target temperature range when stopping the operation of the compressor.
When the control unit stops the operation of the compressor, an operation ratio that is a ratio of operating the compressor during a preset ratio determination period has reached a predetermined reference ratio. The changed target temperature range is initialized in case, and the changed target temperature range is not initialized when the operation ratio does not reach the reference ratio. refrigerator.
The refrigerator according to any one of claims 1 to 3, wherein the control unit starts changing the target temperature range when a predetermined standby period has elapsed since the compressor was stopped.
An open / close detection unit that detects opening / closing of the freezer compartment door, and the control unit has a predetermined open / close number of times that the freezer door is opened / closed during a predetermined open / close determination period. Or when the opening period during which the freezer compartment door is open during the opening / closing determination period has reached a predetermined reference opening period, the operation of the compressor is stopped. The refrigerator as described in any one of Claim 1 to 3 which starts the change of the said target temperature range at a time.
The control unit changes the target temperature range based on the open / close state of the freezer compartment door during the open / close determination period in addition to the operating state of the compressor. The refrigerator according to claim 7, wherein the number of times of opening and closing, which is the number of times the door is opened and closed, is acquired, and the amount of change in the target temperature range is increased as the acquired number of times of opening and closing is increased.
The control unit changes the target temperature range based on the open / close state of the freezer compartment door during the open / close determination period in addition to the operating state of the compressor. The refrigerator according to claim 7 or 8, wherein an opening period that is a period during which the door is open is acquired, and the amount of change in the target temperature range is increased as the acquired opening period is longer.
The said control part changes the said target temperature range by changing both the said upper limit temperature and the said minimum temperature to the low temperature side, or changing only the said upper limit temperature to the low temperature side. The refrigerator as described in any one of.