JP2008032322A - Refrigerator-freezer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator-freezer for freezing and refrigerating by sharing a single cooler capable of restraining dew condensation and freezing at a motor damper, eliminating a risk of a temperature rise in a refrigeration chamber at the time of defrosting and affecting refrigerated food and suppressing electric power consumption. <P>SOLUTION: In the refrigerator-freezer, the single refrigerator is shared to refrigerate a freezing chamber and the refrigerating chamber and a controller 20 conducts dew condensation prevention control by opening a motor damper 12 provided at a communication port communicating from a cooling chamber 6 to the refrigerating chamber 3A when starting defrosting and closing the motor damper 12 when a temperature measured or estimated by a damper temperature detection means becomes equal to or higher than a predetermined temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refrigerator-freezer.

  Conventionally, a single cooler is shared to cool a freezer compartment and a refrigerator compartment (a refrigerator equipped with a vegetable compartment includes the vegetable compartment. The same applies to the present invention) and for cooling the refrigerator compartment A refrigerator-freezer equipped with a function for communicating and shutting off the cool air from the cooler by opening and closing a motor damper provided in a partition partitioning the refrigerator compartment from the freezer compartment energizes the defrost heater at a predetermined cycle. The defroster is defrosted, and the motor damper is always closed during the defrosting to prevent the heat from the defrost heater from flowing into the refrigerating room and preventing the temperature from rising.

  However, when performing such control, when the motor damper is closed and the defrost heater is energized, and the motor damper is opened to start cooling the refrigerator compartment after the defrost is completed, the cooling chamber side is still on the defrost heater. The temperature of the refrigerator compartment is relatively low, while it is warmed by heat and is in a hot and humid state, so when warm air flows in, the relationship between the surface temperature of the motor damper in the refrigerator compartment and the temperature of the refrigerator compartment air is reversed. The refrigerator air temperature is higher than the surface temperature. As a result, dew condensation occurs on the surface of the motor damper, and there is a risk that the water droplet will eventually freeze and the motor damper will freeze and become inoperable. In particular, if the refrigerating room is in a high humidity state, condensation or icing is likely to occur around the motor damper.For example, if the refrigerating room has half doors, or both the refrigerating room and freezing room have half doors. The possibility of this condensation and freezing will increase.

  On the other hand, in Japanese Patent Laid-Open No. 6-137737 (Patent Document 1), during defrosting, control is performed to force the motor damper to open regardless of the operation stop of the compressor. In the case where the warm and humid air generated in the cooling chamber is discharged to both the refrigerator compartment and the freezer compartment, and the internal volume of the freezer compartment is small, the outflow of warm moisture concentrates only in the freezer compartment, and the temperature rise in the freezer compartment A technique is described that prevents the increase in temperature and makes the temperature rise uniform during defrosting in both the refrigerator compartment and the freezer compartment.

According to this conventional technique, the motor damper is kept open during defrosting, so that condensation and icing of the motor damper can be prevented, but the refrigerator is not opened in order to keep the motor damper open until defrosting is completed. There is a problem that the temperature rises as necessary, which may adversely affect the food, and power consumption increases due to cooling after the defrosting.
JP-A-6-137737

  The present invention has been made in view of the above-described conventional technical problems, and is provided in a refrigerator-freezer that freezes and refrigerates by sharing a single cooler, and suppresses the occurrence of condensation and icing in the motor damper. It is an object of the present invention to provide a refrigerator-freezer that can eliminate the risk of adversely affecting refrigerated food due to an increase in temperature of the refrigerator compartment during defrosting, and can also reduce power consumption.

  One feature of the present invention is that a single cooler is shared to cool the freezer compartment and the refrigerator compartment, and the cold air from the refrigerator is communicated and shut off by opening and closing the motor damper. A refrigerator / refrigerator for cooling, a cooler temperature sensor for detecting the cooler temperature, damper temperature detecting means for measuring or estimating an ambient temperature of the motor damper, and a defrost heater for defrosting the cooler The defrost heater is turned on at a predetermined cycle to defrost the cooler, and when the temperature detected by the cooler temperature sensor reaches a preset defrost end temperature, the defrost heater is turned off and removed. A controller that terminates frost, and the controller opens the motor damper at the start of defrosting, and when the temperature measured or estimated by the damper temperature detecting means exceeds a predetermined temperature, the controller The Tadanpa is a refrigerator to perform the condensation prevention control to be closed.

  The refrigerator-freezer of the invention further includes a refrigerator door sensor that detects an open state of the refrigerator door, and the controller detects when the refrigerator door sensor detects a predetermined open state of the refrigerator door, The dew condensation prevention control can be performed.

  Moreover, the refrigerator-freezer of the said invention is further equipped with the refrigerator compartment door sensor which detects the open state of a refrigerator compartment door and the refrigerator compartment door sensor which detects the open state of a refrigerator compartment door, The said controller is the said refrigerator compartment. The dew condensation prevention control can be performed when both the door sensor and the freezer compartment door sensor detect a predetermined open state.

  Another feature of the present invention is that a single cooler is shared to cool the freezer compartment and the refrigerator compartment, and the cold air from the cooler is communicated and shut off by opening and closing the motor damper. A refrigerator / refrigerator for cooling, a cooler temperature sensor for detecting the cooler temperature, damper temperature detecting means for measuring or estimating an ambient temperature of the motor damper, and a defrost heater for defrosting the cooler The refrigerator door sensor for detecting the open state of the refrigerator compartment door, the defrost heater is turned on at a predetermined cycle to defrost the cooler, and the detection temperature of the cooler temperature sensor is preset. A controller that turns off the defrost heater when the defrosting end temperature is reached and ends the defrosting, the controller opens the motor damper at the start of defrosting, and measures the damper temperature detecting means or A refrigerator-freezer that performs dew condensation prevention control to close the motor damper when the temperature to be determined is equal to or higher than a predetermined temperature, and performs control to always open the motor damper when the refrigerator compartment door sensor detects a predetermined open state. .

  Still another feature of the present invention is that the freezer compartment and the refrigerating compartment are cooled by sharing a single cooler, and the cold air from the cooler is communicated and shut off by opening and closing the motor damper. A refrigerator temperature sensor for detecting the temperature of the cooler, a damper temperature detecting means for measuring or estimating an ambient temperature of the motor damper, and a defrost heater for defrosting the cooler A refrigerator compartment door sensor for detecting the open state of the refrigerator compartment door, a freezer compartment door sensor for detecting the open state of the freezer compartment door, and removing the cooler by turning on the defrost heater at a predetermined cycle. A controller that turns off the defrosting heater and terminates the defrosting when the temperature detected by the cooler temperature sensor reaches a preset defrosting end temperature. When the temperature measured or estimated by the damper temperature detecting means becomes equal to or higher than a predetermined temperature, dew condensation prevention control is performed to close the motor damper, and both the refrigerator compartment door sensor and the freezer compartment door sensor are It is a refrigerator-freezer which performs control which always opens the motor damper when a state is detected.

  According to the refrigerator-freezer of the present invention, by opening the motor damper at the start of defrosting, the temperature difference between the freezer compartment side and the refrigerator compartment side is reduced, and the motor damper is prevented from dewing and icing. When the temperature rises above a certain level, the motor damper is closed to prevent the refrigerator from unnecessarily rising in temperature, thereby suppressing adverse effects on food in the refrigerator and power consumption required for recooling Can be saved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) FIGS. 1 and 2 show the structure of a refrigerator-freezer according to one embodiment of the present invention. 1 and 2, reference numeral 1 denotes a heat insulating box body of the refrigerator body, 2A and 2B are partition walls, 3A is a refrigerator compartment, 3B is a vegetable compartment, 4 is a freezer compartment, and 5 is a compressor. Reference numeral 6 denotes a cooling chamber provided at the back of the freezing chamber 4, in which a cooler 7, a cool air forced circulation blower 8, and a defrost heater 9 are provided. The cooling chamber 6 communicates with the freezing chamber 4. Reference numeral 10 denotes a refrigerating room discharge air passage, which connects the cooling room 6 and the refrigerating room 3. A motor damper 12 is provided at the entrance of the refrigerator discharge air passage 10 from the cooling chamber 6 and opens and closes the communication between the cooling chamber 6 and the refrigerator compartment 3A by opening and closing, thereby refrigeration from the cooling chamber 6. The cool air fed into the room 3A is adjusted, and the temperature of the cold room 3A and the vegetable room 3B communicating therewith is adjusted. 13 is a refrigerator temperature sensor, and 14 is a cooler temperature sensor. Furthermore, 15 is a refrigerator compartment door sensor, 16 is a vegetable compartment door sensor, and 17 is a freezer compartment door sensor.

  Reference numeral 20 denotes a controller that controls all functions of the refrigerator-freezer of the present embodiment. The refrigerator compartment temperature sensor 13, the cooler temperature sensor 14, the refrigerator compartment door sensor 15, the vegetable compartment door sensor 16, and the freezer compartment door sensor 17 are provided. A detection signal from a sensor group such as the above is input to control machinery such as the compressor 5, the cooler 7, the blower 8, the defrost heater 9, and the motor damper 12.

  About the refrigerator-freezer of the above structure, the flow operation | movement of the cold air is demonstrated. During the operation of the compressor 5, the cold air cooled by the cooler 7 is supplied to the freezer compartment 4 by the operation of the blower 8 for forced air circulation in conjunction with the operation of the compressor 5, and is then placed below the cooler 7. The freezer compartment 4 is cooled by returning.

  On the other hand, with respect to the refrigerator compartment 3A and the vegetable compartment 3B, the cold air in the cooling compartment 6 passes through the motor damper 12 and is supplied to the refrigerator compartment 3A through the cold compartment discharge air passage 10, and this refrigerator compartment 3A and vegetable compartment After passing through 3B, it is cooled by returning to the lower part of the cooler 7. When the operation of the compressor 5 is stopped, the operation of the cool air forced circulation blower 8 is also stopped, and the above-described flow of cool air does not occur.

  The amount of cool air supplied to the refrigerating room 3A is adjusted by the controller 20 reading the temperature of the refrigerating room temperature sensor 13 and opening and closing the motor damper 12 in comparison with the set temperature. For example, when the temperature of the refrigerating room temperature sensor 13 is higher than the set temperature, the motor damper 12 is opened, and the cool air is supplied to the refrigerating room 3 to be cooled, and the temperature of the refrigerating room 3 is controlled to be lowered. Conversely, when the temperature of the refrigerator compartment temperature sensor 13 is lower than the set temperature, the motor damper 12 is closed to stop the supply of cold air to the refrigerator compartment 3A, and the cooling of the refrigerator compartment 3 is stopped. By controlling the controller 20 as described above, the refrigerator compartment 3 is kept at a predetermined temperature by supplying appropriate amounts of cold air into the refrigerator compartment 3A and the vegetable compartment 3B.

  Next, the control in the defrost mode in the refrigerator-freezer of this Embodiment is demonstrated. FIG. 3 shows a functional configuration of the defrosting mode control unit of the controller 20 in the refrigerator-freezer of this embodiment. An input from the cooler temperature sensor 14 is input to the controller 20 as an input element, and a compressor 5, a defrost heater 9, and a motor damper 12 are controlled. The controller 20 has a built-in clock for timing.

  The controller 20 performs defrosting control based on the flowchart shown in FIG. It shifts to the defrost mode at a predetermined cycle (step S1). When the defrost mode is entered, the controller 20 stops the compressor 5, turns on the defrost heater 9 (step S2), and simultaneously opens the motor damper 12 so that the cooling chamber 6 and the refrigerating chamber 3A communicate with each other. As a result, the temperature difference is suppressed from occurring immediately after the defrosting is finished and the cooling is restarted, and the condensation on the surface of the motor damper 12 on the refrigerator compartment side is suppressed (step S3).

  The controller 20 monitors the temperature transition with the cooler temperature sensor 14 while defrosting proceeds. If the damper ambient temperature estimated based on the temperature detected by the cooler temperature sensor 14 is equal to or higher than a predetermined value, the motor damper 12 is closed to cool the refrigerator compartment 3A even when the defrost heater 9 is energized. The temperature is prevented from being unnecessarily increased by shutting off from the chamber 6, and less power is required for re-cooling the refrigerating chamber 3A after completion of the defrosting mode (steps S4 and S5). . In addition, closing the motor damper 12 causes a slight temperature difference between the surface temperature on the refrigerator compartment side of the motor damper 12 and the temperature on the cooling chamber side, but the open period is long, so icing does not occur.

  After that, the controller 20 watches the transition of the temperature detected by the cooler temperature sensor 14 and determines that the defrosting is finished if the temperature starts to rise after a certain period of 0 ° C., and cuts off the power supply to the defrost heater 9 ( In steps S6 and S7, the compressor 5 is restarted to restart cooling of the freezer compartment 4 (step S8), the motor damper 12 is controlled to open and close in the normal mode, and the temperature control of the refrigerator compartment 3A is also resumed (step S9). ). Here, opening / closing control of the motor damper 12 in the normal mode means, for example, that the motor damper 12 is closed when the temperature of the refrigerating room is lower by 1 ° C. than the set temperature, and the inflow of cold air from the cooling room 6 is shut off. If the temperature becomes 3 ° C. higher than the set temperature, the motor damper 12 is opened to take in cold air from the cooling chamber 6 and control to lower the room temperature.

  According to the refrigerator-freezer of the present embodiment, at the start of defrosting, the motor damper 12 is opened to allow the cooling chamber 6 and the refrigeration chamber 3A to communicate with each other, thereby reducing the temperature difference, and condensation on the refrigeration chamber side surface of the motor damper 12; If the ambient temperature of the damper estimated based on the temperature detected by the cooler temperature sensor 14 exceeds a predetermined value, the motor damper 12 is closed even when the defrost heater 9 is energized. It is operated to prevent the refrigerator compartment 3A from being shut off from the refrigerator compartment 6 to prevent the temperature from being increased unnecessarily, and to prevent the food in the refrigerator compartment 3A from being adversely affected. Electric power required for recooling the refrigerator compartment 3A can be reduced.

  FIG. 5 shows the transition of the detected temperature T1 of the cooler temperature sensor and the transition of the surface temperature T2 of the motor damper and the ambient temperature T3 of the refrigeration chamber side of the motor damper when control is performed so that the motor damper is normally closed in the conventional defrost mode. FIG. 6 shows the temperature transition at the same position in the present embodiment. In the case of the conventional example shown in FIG. 5, the refrigerating room is separated from the cooling room in order to keep the motor damper normally closed when defrosting is started. As a result, the cooling chamber temperature T1 is below the freezing point since the cooling chamber is not heated by the heat of the defrost heater, and the surface temperature T2 of the motor damper in contact therewith is also drawn to the temperature T1 on the cooling chamber side, so that the temperature T3 on the refrigerator compartment side. It was lower than that, and condensation and icing occurred on the surface of the motor damper in the refrigerator compartment.

  On the other hand, in the case of the present embodiment, the cooling chamber 6 and the refrigerating chamber 3A communicate with each other in order to open the motor damper at the start of defrosting. As a result, since the cold heat of the cooling chamber 6 flows to the refrigerating chamber 3A side, the temperature difference between the two sides is reduced, and the temperature difference between the surface temperature T2 of the motor damper 12 and the ambient temperature T3 of the motor damper 12 on the refrigerating chamber 3A side. As a result, no condensation or icing occurs on the surface of the motor damper in the refrigerator compartment. Then, by forcibly closing the motor damper 12 at a timing τ1 at which the frost of the cooler 6 can be regarded as being thawed by the cooler temperature sensor 14, the cold air on the refrigerator compartment 3A side is not warmed by the air on the cooler chamber 6 side. By blocking in this way, it is possible to prevent the temperature from rising unnecessarily further, to prevent the food in the refrigerator compartment 3A from being adversely affected, and to recool the refrigerator compartment 3A after the end of the defrosting mode. Less power is required Furthermore, since the surface temperature rise of the motor damper 12 is small, no condensation occurs.

  In the above embodiment, the controller 20 estimates the ambient temperature of the motor damper 12 based on the temperature detected by the cooler temperature sensor 14. However, a separate temperature sensor is installed at a suitable location near the motor damper 12. The ambient temperature of the motor damper 12 may be detected by this temperature sensor, and the timing for forcibly closing the motor damper 12 during defrosting may be determined based on the detected temperature. In this case, the control for preventing condensation and freezing of the motor damper 12 and power saving can be performed with higher reliability.

  (Second Embodiment) A refrigerator-freezer according to a second embodiment of the present invention will be described with reference to FIGS. The structure of the refrigerator-freezer of this embodiment is common to the first embodiment shown in FIGS. The feature of the present embodiment is the control function of the controller 20, the functional configuration shown in FIG. 7, and the control shown in the flowchart of FIG.

  In the defrosting mode, the controller 20 includes the temperature signal of the cooler temperature sensor 14, the refrigerator compartment door sensor 15 that detects the open state of the refrigerator compartment door, the vegetable compartment door sensor 16 that detects the open state of the vegetable compartment door, and the freezing. A door open detection signal is input from the freezer compartment door sensor 17 that detects the open state of the compartment door, and the refrigerator compartment door sensor 15 or the vegetable compartment door sensor 16 and the signals of the freezer compartment door sensor 17 are used for these refrigerator compartment doors or vegetable compartments. When the door and the freezer compartment door both detect a predetermined open state, the same motor damper condensation prevention control as in the first embodiment is performed.

  The dew condensation prevention control of the motor damper 12 by the controller 20 is based on the flowchart of FIG. It shifts to the defrosting mode at a predetermined cycle (step S11). If it enters into a defrost mode, the controller 20 will stop the compressor 5, and will throw in the defrost heater 9 (step S12). And if the open detection signal of the refrigerator compartment door sensor 15 or the vegetable compartment door sensor 16 and the freezer compartment door sensor 17 continues and is input more than a fixed time, the controller 20 will carry out these refrigerator compartment doors or vegetable compartment doors. It is determined that both the freezer compartment doors are in a predetermined open state (step S13). The “predetermined open state” means, for example, when the door open state has elapsed for a predetermined time, for example, 3 minutes or more, or for a short time (for example, 3 minutes) before or during the defrost operation. When the door has been opened or closed for a long period of time, such as when it has detected opening and closing a predetermined number of times (for example, 5 times), or has been opened and closed several times within a short period of time. A state where the inside of the refrigerator compartment 3A is estimated to be humid. The optimum judgment conditions are appropriately determined based on experiments.

  Here, if it is determined that both the refrigerator compartment door or the vegetable compartment door and the freezer compartment door are in a predetermined open state, the motor damper 12 is opened to cause the cooling chamber 6 and the refrigerator compartment 3A to communicate with each other. In order to prevent condensation and icing from forming on the surface of the motor damper 12 on the refrigerator compartment side during recooling immediately after the completion of defrosting (step S14).

  The controller 20 monitors the temperature transition with the cooler temperature sensor 14 while defrosting proceeds. If the damper ambient temperature estimated based on the temperature detected by the cooler temperature sensor 14 is equal to or higher than a predetermined value, the motor damper 12 is closed to cool the refrigerator compartment 3A even when the defrost heater 9 is energized. It is necessary to re-cool the refrigeration room 3A after the defrosting mode is completed, preventing the temperature from being unnecessarily increased by shutting off from the room 6 and preventing the food inside from being adversely affected. The power is reduced (steps S15 and S16). In addition, closing the motor damper 12 causes a slight temperature difference between the surface temperature on the refrigerator compartment side of the motor damper 12 and the temperature on the cooling chamber side, but the open period is long, so icing does not occur.

  After that, the controller 20 watches the transition of the temperature detected by the cooler temperature sensor 14 and determines that the defrosting is finished if the temperature starts to rise after a certain period of 0 ° C., and cuts off the power supply to the defrost heater 9 ( Steps S17 and S18), the compressor 5 is restarted to restart the cooling of the freezer compartment 4 (step S19), the motor damper 12 is controlled to open and close in the normal mode, and the temperature control of the refrigerator compartment 3A is also resumed (step S20). ).

  On the other hand, if it is determined as “NO” in the door half-open determination in step S13, the process jumps to step S16 without performing the processes in steps S14 and S15, and the motor damper 12 is forcibly closed. The process of S20 is performed.

  In particular, when the refrigerator door and freezer door are in a predetermined open state such as a half-open state or an open state, the possibility of outside air flowing in and high humidity is significant in the refrigerator compartment and freezer compartment, and cooling resumes. Immediately after that, condensation and icing are likely to occur on the surface of the motor damper 12. Therefore, in this embodiment, it is determined whether or not both the refrigerator compartment door and the freezer compartment door are in a predetermined open state at the start of defrosting. If the door is in the predetermined open state, the motor damper 12 is opened to open the cooling chamber. 6 and the refrigerator compartment 3A are communicated to eliminate a temperature difference, and if the damper ambient temperature estimated based on the temperature detected by the cooler temperature sensor 14 exceeds a predetermined value, the defrost heater 9 is being energized. Even in this case, the motor damper 12 is closed to perform dew condensation prevention control for shutting off the refrigerator compartment 3A from the cooling chamber 6. As a result, in the present embodiment, the control is performed in a state in which condensation is likely to occur while reducing the influence of the temperature of the refrigerator compartment 3A as compared with the first embodiment. Generation can be suppressed.

  In the second embodiment, in the dew condensation prevention control, the motor damper 12 is forcibly opened immediately after the start of the defrosting mode when both the refrigerator compartment door and the freezer compartment door are in a predetermined open state. However, instead of this, it is determined whether one or both of the refrigerator compartment door and the vegetable compartment door are in a predetermined open state, and the motor damper 12 is forcibly opened immediately after the start of the defrosting mode. Control can be adopted. In this case, the input of the freezer compartment door sensor 17 is unnecessary in terms of configuration. Even when the doors of the refrigerator compartment 3A and the vegetable compartment 3B, both of which are controlled to a temperature equal to or higher than the freezing temperature, are in a predetermined open state, the temperature difference from the inside of the cooling chamber 6 is large, and condensation on the surface of the motor damper 12 This is because icing is likely to occur.

  Even in the present embodiment, a temperature sensor is separately installed at an appropriate location near the motor damper 12, the ambient temperature of the motor damper 12 is detected by the temperature sensor, and defrosting is performed based on the detected temperature. The timing for forcibly closing the motor damper 12 may be determined.

  (Third Embodiment) A refrigerator-freezer according to a third embodiment of the present invention will be described with reference to FIGS. The structure of the refrigerator-freezer of this embodiment is common to the first embodiment shown in FIGS. And the function structure for implement | achieving control in the defrost mode by the controller 20 in this Embodiment is shown in FIG. 9, and the control processing in the defrost mode is based on the flowchart of FIG.

  As shown in FIG. 9, the controller 20 inputs signals from the cooler temperature sensor 14, the refrigerator compartment door sensor 15, and the vegetable compartment door sensor 16, and controls the compressor 5, the defrost heater 9, and the motor damper 12. . Then, in the defrost mode, the controller 20 includes a refrigerator signal sensor 15 that detects the open state of the refrigerator compartment door and a vegetable compartment door sensor 16 that detects the open state of the vegetable compartment door together with the temperature signal of the cooler temperature sensor 14. When the door open detection signal is input and it is determined from the signal of the refrigerator compartment door sensor 15 or the vegetable compartment door sensor 16 that the refrigerator compartment door or the vegetable compartment door is in a predetermined open state, the motor damper 12 is forcedly opened. If these are not in the predetermined open state, the same motor damper condensation prevention control as that in the first embodiment is performed.

  The dew condensation prevention control of the motor damper 12 by the controller 20 is based on the flowchart of FIG. It shifts to the defrost mode at a predetermined cycle (step S31). If it enters into a defrost mode, the controller 20 will stop the compressor 5, and will throw in the defrost heater 9 (step S32). And if the open detection signal of the refrigerator compartment door sensor 15 or the vegetable compartment door sensor 16 is continuously input for a predetermined time or more, the controller 20 indicates that these refrigerator compartment doors or vegetable compartment doors are in a predetermined open state. Judgment is made (step S33).

  Here, if it is determined that the refrigerator compartment door or the vegetable compartment door is not in the predetermined open state, the motor damper 12 is opened to connect the cooling chamber 6 and the refrigerator compartment 3A so that the temperature difference is eliminated. This prevents the occurrence of condensation and icing on the surface of the refrigerator compartment (step S34). Thereafter, the controller 20 monitors the temperature transition with the cooler temperature sensor 14 while defrosting proceeds. If the damper ambient temperature estimated based on the temperature detected by the cooler temperature sensor 14 is equal to or higher than a predetermined value, the motor damper 12 is closed to cool the refrigerator compartment 3A even when the defrost heater 9 is energized. The temperature is prevented from being unnecessarily increased by shutting off from the chamber 6, and the electric power necessary for recooling the refrigerating chamber 3A after completion of the defrosting mode is reduced (steps S35 and S36).

  After that, the controller 20 watches the transition of the temperature detected by the cooler temperature sensor 14 and determines that the defrosting is finished if the temperature starts to rise after a certain period of 0 ° C., and cuts off the power supply to the defrost heater 9 ( (Steps S37, S38), the compressor 5 is restarted to restart the cooling of the freezer compartment 4 (Step S39), the motor damper 12 is controlled to open and close in the normal mode, and the temperature control of the refrigerator compartment 3A is also resumed (Step S40). ).

  On the other hand, if it is determined in step S33 that at least one of the refrigeration room door or the vegetable room door is in a predetermined open state, the process jumps to step S37 without performing the processes in steps S34 to S36. Steps S37 to S40 are performed.

  In particular, when the refrigeration room door or the vegetable room door is in a predetermined open state such as a half-open state or an open state, there is a significant possibility that the outside air will flow in and become high humidity in the refrigeration room 3A. Immediately after the start, condensation tends to occur on the surface of the motor damper 12.

  Therefore, according to the present embodiment, when the refrigerator compartment door or the vegetable compartment door is not in a predetermined open state, the condensation of the motor damper 12 is controlled by controlling the opening and closing of the motor damper 12 as in the second embodiment. If the damper ambient temperature estimated based on the temperature detected by the cooler temperature sensor 14 exceeds a predetermined value, the motor damper 12 is closed even when the defrost heater 9 is energized. The refrigeration room 3A is cut off from the cooling room 6 to prevent the temperature from being raised unnecessarily, and the food inside is prevented from being adversely affected, and the refrigeration room 3A after the defrosting mode is finished. Reduce the power required for recooling.

  On the other hand, when the refrigeration room door or the vegetable room door is in a predetermined open state, the refrigeration room may become highly humid. Therefore, the motor damper 12 is opened during the defrost mode and the cooling room 6 and the refrigeration room are open. The temperature difference is reduced by communicating with 3A, and the occurrence of condensation on the refrigerator compartment side of the motor damper 12 is effectively suppressed.

  In the third embodiment, in the dew condensation prevention control, attention is paid only to the refrigerator compartment door and the vegetable compartment door. However, as in the second embodiment, the refrigerator compartment door or the vegetable compartment door and the freezer compartment door are separated from each other. Whether or not both the refrigerator compartment door or the vegetable compartment door and the freezer compartment door are in a predetermined open state by performing the above control when both are in a predetermined open state such as a half-open state or an open state. Therefore, it is possible to employ control for forcibly opening the motor damper 12 immediately after the start of defrosting.

  Even in the present embodiment, a temperature sensor is separately installed at an appropriate location near the motor damper 12, the ambient temperature of the motor damper 12 is detected by the temperature sensor, and defrosting is performed based on the detected temperature. The timing for forcibly closing the motor damper 12 may be determined.

The front view of the refrigerator-freezer of the 1st Embodiment of this invention. Side surface sectional drawing of the refrigerator-freezer of the said embodiment. The block diagram of the control function of the refrigerator-freezer of the said embodiment. The flowchart of the control processing by the controller in the said embodiment. The graph which shows transition of the cooling chamber temperature at the time of the defrost mode by a prior art example, motor damper surface temperature, and motor damper ambient temperature. The graph which shows transition of the cooling chamber temperature at the time of the defrost mode in the said embodiment, motor damper surface temperature, and motor damper ambient temperature. The block diagram of the control function of the refrigerator-freezer of the 2nd Embodiment of this invention. The flowchart of the control processing by the controller in the said embodiment. The block diagram of the control function of the refrigerator-freezer of the 3rd Embodiment of this invention. The flowchart of the control processing by the controller in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat insulation box 2A, 2B Partition wall 3A Refrigeration room 3B Vegetable room 4 Freezer room 5 Compressor 6 Cooling room 7 Cooler 8 Blower 9 Defrost heater 12 Motor damper 14 Cooler temperature sensor 15 Cold room door sensor 16 Vegetable room door sensor 17 Freezer compartment sensor 20 Controller

Claims (5)

A refrigerator-freezer that cools the refrigerator compartment by sharing a single cooler to cool the refrigerator compartment and the refrigerator compartment, and communicating and shutting off the cool air from the cooler by opening and closing the motor damper. ,
A cooler temperature sensor for detecting the cooler temperature;
Damper temperature detecting means for measuring or estimating the ambient temperature of the motor damper;
A defrost heater for defrosting the cooler;
The defrost heater is turned on at a predetermined cycle to defrost the cooler, and the defrost heater is turned off when the temperature detected by the cooler temperature sensor reaches a preset defrost end temperature. And a controller for terminating
The controller performs dew condensation prevention control that opens the motor damper at the start of defrosting and closes the motor damper when the temperature measured or estimated by the damper temperature detection means is equal to or higher than a predetermined temperature. . A cold room door sensor is provided to detect the open state of the cold room door,
2. The refrigerator-freezer according to claim 1, wherein the controller performs the dew condensation prevention control when the refrigerator compartment door sensor detects a predetermined open state of the refrigerator compartment door. A refrigeration room door sensor for detecting the open state of the refrigeration room door and a freezer compartment door sensor for detecting the open state of the freezer room door;
2. The refrigerator-freezer according to claim 1, wherein the controller performs the dew condensation prevention control when both the refrigerator compartment door sensor and the freezer compartment door sensor detect a predetermined open state. A refrigerator-freezer that cools the refrigerator compartment by sharing a single cooler to cool the refrigerator compartment and the refrigerator compartment, and communicating and shutting off the cool air from the cooler by opening and closing the motor damper. ,
A cooler temperature sensor for detecting the cooler temperature;
Damper temperature detecting means for measuring or estimating the ambient temperature of the motor damper;
A defrost heater for defrosting the cooler;
A refrigerator door sensor for detecting the open state of the refrigerator compartment door;
The defrost heater is turned on at a predetermined cycle to defrost the cooler, and the defrost heater is turned off when the temperature detected by the cooler temperature sensor reaches a preset defrost end temperature. And a controller for terminating
The controller performs dew condensation prevention control to open the motor damper at the start of defrosting and to close the motor damper when the temperature measured or estimated by the damper temperature detecting means exceeds a predetermined temperature, and the refrigerator door sensor A refrigerator-freezer characterized by performing control to always open the motor damper when a predetermined open state is detected. A refrigerator-freezer that cools the refrigerator compartment by sharing a single cooler to cool the refrigerator compartment and the refrigerator compartment, and communicating and shutting off the cool air from the cooler by opening and closing the motor damper. ,
A cooler temperature sensor for detecting the cooler temperature;
Damper temperature detecting means for measuring or estimating the ambient temperature of the motor damper;
A defrost heater for defrosting the cooler;
A refrigerator door sensor for detecting the open state of the refrigerator compartment door;
A freezer door sensor for detecting the open state of the freezer door;
The defrost heater is turned on at a predetermined cycle to defrost the cooler, and the defrost heater is turned off when the temperature detected by the cooler temperature sensor reaches a preset defrost end temperature. And a controller for terminating
The controller opens the motor damper at the start of defrosting, performs dew condensation prevention control to close the motor damper when the temperature measured or estimated by the damper temperature detecting means is equal to or higher than a predetermined temperature, the refrigerator compartment door sensor, A refrigerator-freezer characterized in that control is performed so that the motor damper is normally opened when both freezer compartment door sensors detect a predetermined open state.

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