JP2013200083A - Cooling storage - Google Patents

Abstract

An object of the present invention is to effectively eliminate the impossibility of rotation due to icing of a fan of a cooling storage.
The control device 40 controls the refrigerant supply to the evaporators 5 and 6 and the blowers 7F and 7R based on the temperatures of the freezer compartment 3 and the refrigerator compartment 4 to execute a cooling operation, and the refrigerant to the evaporator The supply and the blower are stopped, the defroster heaters 46 and 47, the drain pan heaters 48 and 51, and the fan case heaters 49 and 52 are energized to execute the defrosting operation of the evaporator. The energization to the defrost heater is stopped when the defrost operation is completed. After the defrosting operation, when the blower is rotatable, the energization to the heaters 48, 51, 49, 52 is stopped to return to the cooling operation, and when the rotation is impossible, the heater is continuously energized.
[Selection] Figure 5

Description

  The present invention relates to a cooling storage that cools by supplying cool air exchanged with an evaporator to a storage chamber by a blower.

  Conventionally, in this kind of cooling storage, a refrigerant circuit is constituted by an evaporator connected via a compressor, a condenser, a capillary tube, etc., and the refrigerant discharged from the compressor is radiated by the condenser. The cold air that has flowed into the evaporator through the capillary tube and evaporated is also circulated and supplied to the storage chamber by a blower to cool it.

  In particular, in a cold storage where a freezing room and a refrigerating room are configured and cooled by an evaporator in each room, a refrigerating room evaporator connected via a compressor, a condenser, and a capillary tube, and another capillary A refrigerant circuit is constituted by a freezer compartment evaporator connected through a tube. And after radiating the refrigerant | coolant discharged from the compressor with a condenser, the refrigerator compartment evaporator to which one capillary tube was connected via the three-way valve, or the freezer compartment evaporator to which the other capillary tube was connected The freezing room and the refrigerating room were each cooled by circulating and supplying the cold air evaporated and heat exchanged with the respective evaporators to each room with the freezing room blower and the refrigerating room blower (for example, Patent Document 1).

  Further, since frosting grows in the evaporator due to the cooling operation, a defrosting operation is performed in which the compressor and the blower are periodically stopped and the frost heater is energized to melt the frost. However, especially in the case of a freezer or when the setting is lower than zero even in a refrigerator, frost grows around the blower. When this frost increases, it may become ice while the blower is stopped during the defrosting operation of the evaporator, and it adheres to the blower, and the blower freezes and may not be activated (for example, Patent Document 2). reference).

Japanese Patent No. 3922891 JP 2009-180391 A

  However, in the conventional cooling store like the above-mentioned Patent Document 2, when the air blower freezes, only the alarm is given, and therefore the air blower that cannot be rotated is left as it is.

  Further, in Patent Document 2, since a plurality of blowers are provided for one evaporator, a non-rotatable blower can be left unattended. However, as described above, each cooling storage having a freezing room and a refrigeration room has each of them. In the case where one blower is provided in the room, for example, the blower in the freezer compartment may not be able to rotate, but the blower in the refrigerator compartment may have no problem. In such a case, there is a problem that it is impossible to return to the cooling operation only by alarming the inability to rotate the blower in the freezer compartment, and the cooling of the freezer compartment without any problem is stopped.

  The present invention has been made to solve the conventional technical problems, and effectively eliminates the inability to rotate due to icing of the blower, and even if it cannot be eliminated, the storage chamber can be cooled as much as possible. Provide a cool storage cabinet that can.

  In order to solve the above-mentioned problem, the cooling storage of the invention of claim 1 is a cooling storage for supplying defrosted air to the storage chamber by a blower to cool the defrosting heater for defrosting the evaporator. A freezing and melting heater provided near the blower and contributing to freezing and melting of the blower, a storage room temperature sensor for detecting the temperature in the storage room, and a predetermined defrosting return temperature of the evaporator A defrosting return temperature sensor, and a refrigerant supply to the evaporator based on outputs of these temperature sensors, and a control means for controlling the blower, the defrosting heater and the freezing and thawing heater are provided. The refrigerant supply to the evaporator and the blower are controlled based on the temperature of the storage chamber detected by the engine to execute the cooling operation of the storage chamber, the refrigerant supply to the evaporator and the blower are stopped, the defrosting heater and the ice melting heater To energize The defrosting operation of the evaporator is executed, the energization to the defrosting heater is stopped at the end of the defrosting operation, and if the blower can be rotated after the defrosting operation is completed, When the energization is stopped and the operation returns to the cooling operation and rotation is impossible, the ice melting and melting heater is continuously energized.

  The cooling storage of the invention of claim 2 comprises a plurality of blowers in the above invention, and when all the blowers are rotatable after the defrosting operation is completed, the energization to the ice melting heater is stopped and the cooling operation is restored. However, when any of the fans cannot rotate, the ice melting and melting heater is continuously energized.

  The cooling storage of the invention of claim 3 has a freezer compartment evaporator that cools the freezer compartment and a refrigerator compartment evaporator that cools the refrigerator compartment, and the refrigerant compressed by the compressor is refrigerated via the decompression means. Distributing and supplying to the room evaporator and the refrigerator compartment evaporator, and cooling the air that has been heat-exchanged with each evaporator by supplying it to each chamber by the refrigerator compartment fan and refrigerator compartment fan, respectively, Freezing room defrost heater and refrigeration room defrost heater for performing Refrigerating room temperature sensor and refrigerating room temperature sensor for detecting each, freezing room defrosting temperature sensor and refrigerating room defrosting temperature sensor for detecting a predetermined defrosting recovery temperature of each evaporator, and these temperatures Sen On the basis of the output of each of the evaporators, and a control means for controlling each of the blowers, each defrosting heater and each freezing and thawing heater, each of which includes a freezer temperature sensor and a refrigerator temperature sensor Controls the refrigerant supply to each evaporator and each blower based on the temperature detected in the freezer compartment and the refrigerator compartment, executes the cooling operation of each chamber, stops the compressor and each blower, and each defrost heater In addition, the defrosting operation of each evaporator is executed by energizing each ice melting heater, and the energization to each defrosting heater is stopped by the end of this defrosting operation. If rotation is possible, the energization of each freeze-thaw heater is stopped and the cooling operation is resumed. If any blower is not rotatable, the freeze-thaw heater in the room provided with the non-rotatable blower is provided. Continue energizing The features.

  According to the fourth aspect of the present invention, in the above-described invention, when the blower becomes rotatable while the deicing operation is completed and the control unit is energized for a predetermined time after the defrosting operation, It is characterized by stopping energization of the motor and returning to the cooling operation.

  According to the fifth aspect of the present invention, the control means in the first aspect of the invention provides that the control means supplies the freezing and melting heater to the freezing and melting heater if the blower cannot rotate even if the freezing and melting heater is energized for a predetermined time after the defrosting operation. The power supply is stopped, and a backup cooling operation for controlling the supply of refrigerant to the evaporator based on the temperature of the evaporator detected by the defrosting return temperature sensor is performed.

  According to the sixth aspect of the present invention, the cooling storage in the second aspect of the present invention is such that, if the blower cannot rotate even if the freeze-thaw heater is energized for a predetermined time after the defrosting operation is completed, the control means is connected to the freeze-thaw heater. Stopping energization, operating a rotatable blower, and performing a backup cooling operation for controlling the supply of refrigerant to the evaporator in the chamber based on the temperature of the evaporator detected by the defrosting return temperature sensor To do.

  According to a seventh aspect of the present invention, there is provided a cooling storage cabinet according to the third aspect of the present invention, in which the control means supplies the icing and melting heater to the icing and melting heater if the blower cannot rotate even if the icing and melting heater is energized for a predetermined time after the defrosting operation. A backup cooling operation for controlling supply of refrigerant to the evaporator of the chamber is performed based on the temperature of the evaporator detected by the defrosting return temperature sensor for the chamber provided with the non-rotatable blower. In addition, the chamber provided with the rotatable blower is returned to the cooling operation.

  The cooling storage of the invention of claim 8 is characterized in that, in the inventions of claims 5 to 7, the control means issues a predetermined alarm when executing the backup cooling operation.

  According to invention of Claim 1 thru | or 3, after completion | finish of the defrosting operation | movement of an evaporator, when an air blower is rotatable, it stops energization to an icing and melting heater, returns to cooling operation, and the air blower or When any of the fans cannot rotate, the current-freezing / melting heater or the ice-melting / heating heater in the room provided with the non-rotating fan is continuously energized. The locked state) can be effectively melted by the heat from the icing and melting heater that is energized continuously even after the defrosting operation is completed, and can be restored to the operable state.

  And, when the blower becomes rotatable while energizing the freezing and melting heater for a predetermined time as in the invention of claim 4, if the energization to the freezing and melting heater is stopped and the cooling operation is resumed, It is possible to effectively eliminate the occurrence of poor cooling in the storage room, the freezing room, or the refrigeration room due to the icing of the blower, and to prevent deterioration of the stored articles.

  On the other hand, in the invention of claim 1, after completion of the defrosting operation as in the invention of claim 5, if the blower is not able to rotate even if the ice melting heater is energized for a predetermined time, the energization to the ice melting heater is stopped, If a backup cooling operation for controlling the refrigerant supply to the evaporator is executed based on the temperature of the evaporator detected by the defrosting return temperature sensor, the cooler is not circulated due to the inability to rotate the blower. Then, the cool air from the evaporator is naturally convected, and the supply of the refrigerant is controlled by the temperature of the evaporator, so that the storage chamber can be cooled as much as possible. As a result, it is possible to avoid or minimize the deterioration of the stored articles.

  Further, when a plurality of blowers are provided as in the second aspect of the invention, the blower cannot be rotated even if the ice melting heater is energized for a predetermined time after the defrosting operation is completed as in the sixth aspect of the invention. If this is the case, the energization of the ice melting heater is stopped, the rotatable blower is operated, and the refrigerant supply to the evaporator in the chamber is controlled based on the temperature of the evaporator detected by the defrosting return temperature sensor. If the cooling operation is executed, the supply of the refrigerant can be controlled by the temperature of the evaporator while circulating the cool air to the storage chamber with a rotatable blower. Thus, even when the storage room temperature sensor is provided at a position affected by the cold air circulation generated by the non-rotatable blower, the storage room is cooled as accurately as possible to minimize deterioration of the stored items. It becomes possible.

  On the other hand, as in the invention of claim 3, in a cooling storehouse having a freezer compartment and a refrigerator compartment and cooled by a refrigerator compartment evaporator and a refrigerator compartment fan, respectively, and a refrigerator compartment evaporator and a refrigerator compartment fan, respectively. As described above, after the defrosting operation is completed, if the blower cannot be rotated even if the freeze-thaw heater is energized for a predetermined time, the energization to the freeze-thaw heater is stopped and the room provided with the non-rotatable blower is defrosted. Based on the temperature of the evaporator detected by the return temperature sensor, a backup cooling operation for controlling the refrigerant supply to the evaporator of the chamber is executed, and the chamber provided with the rotatable blower is returned to the cooling operation. If this is the case, for the room where the cool air circulation is not performed due to the inability to rotate the blower, the cool air from the evaporator is naturally convected, and the refrigerant supply is controlled by the temperature of the evaporator, so that the room can be as much as possible. The cooled, it is possible to return to the normal cooling operation for a chamber rotatable blower is provided. As a result, it is possible to avoid or minimize the deterioration of stored articles for a room provided with a non-rotatable blower while cooling a room provided with a rotatable blower without trouble. Become.

  When the backup cooling operation is performed as in the eighth aspect of the invention, if the control means issues a predetermined alarm, it is possible to promptly notify the user of the icing abnormality of the blower and prompt the countermeasure. It will be like that.

It is a perspective view of the state where the door of the cooling storage which applied the present invention was opened. It is a vertical side view of the cooling storage of FIG. It is an enlarged view of the drain pan part of FIG. It is a refrigerant circuit figure of the cooling storage of FIG. It is a block diagram of the electric circuit of the control apparatus of the cooling storage of FIG. It is a flowchart explaining the normal cooling operation which the control apparatus of FIG. 5 performs. It is a flowchart explaining the defrost operation which the control apparatus of FIG. 5 performs.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1: has shown the perspective view of the state which open | released the door of the cooling storage 1 to which this invention is applied. The cooling storage 1 of the embodiment used for the description is a vertical commercial refrigerator-freezer installed in a kitchen of a hotel or a restaurant, and is composed of a heat insulating box 2 that opens to the front.

  In the cooling storage 1 of FIG. 1, a freezing room (F) 3 and a refrigerating room (R) 4 as storage rooms are configured by partitioning the inside of the heat insulating box 2 with heat insulating partition walls 2A and 2B. Yes. In this embodiment, the upper portion of the heat insulating box 2 is divided into left and right by a partition wall 2A, and one side (in this case, the left side in FIG. 1) partitioned by the partition wall 2A is further vertically moved by a partition wall 2B. By dividing into two, the upper part of one side (toward the left side) in the heat insulating box 2 is the freezer compartment 3, and the other part (toward the right side) is continuous from the upper part to the lower part (the lower side of the freezer room 3). The refrigeration chamber 4 is configured such that the upper left freezing chamber 3 and the other refrigeration chambers 4 are configured to be incapable of circulating cold air.

  The front opening of the freezer compartment 3 is closed so as to be freely opened and closed by a heat insulating door 8 pivotally supported on one side upper part of the heat insulating box 2, and the front opening of the refrigerator compartment 4 is opened in addition to the heat insulating box 2. The heat insulating doors 9 are pivotally supported independently on the side upper part, the other side lower part, and the one side lower part, respectively, so that they can be freely opened and closed. Thereby, the front opening of the heat insulation box 2 is closed by two sets of double doors 8, 9, 9, 9 provided at the top and bottom so as to be freely opened and closed.

  In addition, 10 in the figure is for partitioning the front opening of the heat insulating box 2 up and down at the same height as the partition wall 2B, so that the doors 8 and 9 are in close contact with each other when the doors 8 and 9 are closed. It is a partition.

  In the upper part of the freezer compartment 3, a freezer compartment evaporator 5 as an evaporator constituting the cooling device 16 of the cooling storage 1 is disposed, and this freezer compartment evaporator 5 and a freezer compartment attached in the vicinity of the front side thereof. The inside of the freezer compartment 3 is cooled to a predetermined freezer compartment cooling temperature range by the blower 7F (FIG. 5). In addition, a refrigerator compartment evaporator 6 as an evaporator constituting the cooling device 16 is also arranged at the upper part of the refrigerator compartment 4, and the refrigerator compartment fan 7R attached in the vicinity of the refrigerator compartment evaporator 6 and its front side. Thus, the inside of the refrigerator compartment 4 is cooled to a predetermined refrigerator compartment cooling temperature range.

  It should be noted that the arrangement and volume ratio of the freezer compartment 3 and the refrigerator compartment 4 are not limited to this, and are configured such that the flow of cold air between each other is not possible. What is necessary is just a cooling storehouse in which the room evaporator 5 and the refrigerator compartment evaporator 6 are arrange | positioned.

  Here, FIG. 2 shows a vertical side view of the cooling storage 1 on the side of the refrigeration room 4 located on the other side (right side) of the heat insulation box 2, in which the refrigeration room evaporator 6 and the refrigeration room. 20 attached below the blower 7R is made of aluminum for partitioning the cooling chamber 21 where the refrigerator compartment evaporator 6 is disposed and the refrigerator compartment 4 to receive and discharge drain water from the refrigerator compartment evaporator 6. The drain pan. The detailed structure of the drain pan 20 is shown in the enlarged view of FIG. In this figure, reference numeral 50 denotes a resin evaporator cover disposed below the drain pan 20. The drain pan 20 and the evaporator cover 50 are open at the rear. Further, the refrigerator compartment fan 7R is housed in the fan case 55, and the drain pan 20 and the evaporator cover 50 corresponding to the lower side of the refrigerator compartment fan 7R are opened, and particularly the part corresponding to the refrigerator compartment fan 7R. The evaporator cover 50 is a slit-shaped fan cover 50A. Then, the cold air sucked into the cooling chamber 21 from the inside of the refrigerator compartment 4 by the refrigerator compartment fan 7 </ b> R exchanges heat with the refrigerator compartment evaporator 6, and then is discharged into the refrigerator compartment 4 from the rear of the cooling chamber 21.

  The drain pan 20, the evaporator cover 50, the fan case 55, and the cooling chamber 21 are configured in the same manner for the freezer evaporator 5 and the freezer blower 7F in the freezer compartment 3, although not shown.

  A machine room 12 is defined on the top surface of the heat insulation box 2 by a panel 11 constituting a front surface, both side surfaces, and a rear surface, and the evaporators 5, 6 are contained in the machine room 12. At the same time, a compressor 13 and a condenser 14 that constitute the cooling device 16 and a condenser blower 15 and the like are disposed.

  The freezer compartment evaporator 5 is provided with a freezer compartment defrosting heater 46 for heating the freezer compartment evaporator 5 and melting the frost in the freezer compartment evaporator 5 for defrosting. A freezing room defrosting return temperature sensor 41 for detecting a predetermined defrosting return temperature (for example, + 10 ° C.) of the room evaporator 5 is attached. Further, the drain pan 20 located below the freezer evaporator 5 is heated to melt the frost adhering to the drain pan 20, and the vicinity of the freezer blower 7F is also heated to freeze the freezer blower 7F. A freezer drain pan heater 48 (FIG. 5) that functions as a freezing and melting heater that contributes to the melting of the ice is attached, and the fan case 55 to which the freezer blower 7F is attached is heated to freeze. A freezer compartment fan case heater 49 is attached as a freezing and melting heater for melting freezing of the room blower 7F (at least contributing to melting).

  On the other hand, the refrigerator compartment evaporator 6 is provided with a refrigerator compartment defrost heater 47 for heating the refrigerator compartment evaporator 6 and melting the frost of the refrigerator compartment evaporator 6 to perform defrosting. A refrigerator defrosting temperature sensor 42 for detecting a predetermined defrosting recovery temperature (for example, + 10 ° C.) of the chamber evaporator 6 is attached. Further, the drain pan 20 located below the refrigerator compartment evaporator 6 heats the drain pan 20 to melt frost attached to the drain pan 20 and also heats the periphery of the refrigerator compartment fan 7R to freeze the refrigerator compartment fan 7R. A refrigerating room drain pan heater 51 that functions as a freezing and melting heater that contributes to melting of the refrigerating room is attached, and the fan case 55 to which the refrigerating room blower 7R is attached is heated by the fan case 55 to A refrigeration compartment fan case heater 52 is attached as an icing and melting heater for melting icing (at least contributing to thawing).

  Furthermore, a refrigerator compartment condensation prevention heater (heater) 53 is attached to the inside of the partition wall 2A, 2B on the side of the refrigerator compartment 4 side. The refrigerating room condensation prevention heater 53 is a heater that heats the surface of the partition walls 2A and 2B on the side of the refrigerating room 4 and by the cooling action from the freezer compartment 3 having a low temperature, the refrigerating room 4 side of the partition walls 2A and 2B. This prevents the occurrence of condensation on the surface.

  Here, the refrigerant circuit of the cooling storage 1 will be described with reference to the refrigerant circuit diagram of FIG. 4. A condenser 14 is connected to the refrigerant discharge side of the compressor 13, and a freezer compartment evaporator 5 that cools the freezer compartment 3 and a refrigerator compartment evaporator that cools the refrigerator compartment 4 are disposed downstream of the condenser 14. 6 are connected via capillary tubes 18 and 19 as decompression means. Each capillary tube 18 and 19 is selected to have an arbitrary diameter and length in consideration of the evaporation temperature in the freezer compartment 3 or the refrigerator compartment 4.

  In this embodiment, the refrigerant compressed by the compressor 13 is passed through the capillary tube 18 through the capillary tube 18 by the three-way valve 17 as a flow path switching means for controlling the refrigerant supply to the evaporators 5 and 6. Alternatively, it can be distributed and supplied to the refrigerator compartment evaporator 6 via the capillary tube 19. That is, by switching and controlling the three-way valve 17, the refrigerant is selectively supplied to only one of the evaporators 5 and 6, and both the freezer evaporator 5 and the refrigerator compartment evaporator 6 are supplied. The state of supplying the refrigerant can be realized.

  In this embodiment, when the refrigerant is supplied to only one of the evaporators 5 and 6 by the three-way valve 17, the temperature of the chamber in which the supplied evaporator is provided is always predetermined. It is assumed that the cooling temperature is deviated from the cooling temperature range in time and the flow of refrigerant into the deviating evaporator 5 or 6 is stopped (thermo-off).

  And the refrigerant | coolant piping 22 and 23 connected to the refrigerant | coolant outflow side of each evaporator 5 and 6 is arrange | positioned so that heat exchange with each corresponding capillary tube 18 and 19 is carried out, The edge part serves as the junction part 24. Connected. The junction 24 is connected to a suction pipe 25 that returns the refrigerant that has flowed out of the evaporators 5 and 6 and returned to the compressor 13.

  Next, the control apparatus 40 which comprises the control means of the cooling storage 1 is demonstrated with reference to the block diagram of the electric circuit of FIG. The control device 40 is constituted by a general-purpose microcomputer, and includes a memory 26 as a storage unit, and has a timer 27 as a time limit unit as its function.

  On the input side of the control device 40, a control panel (input means) 28 that can arbitrarily set the set temperatures TF and TR of the freezer compartment 3 and the refrigerator compartment 4 and a cooling temperature range including the set temperature, a freezer A freezer compartment temperature sensor (freezer compartment temperature detection means; storage compartment temperature sensor) 29 that is attached to the fan cover 50A of the evaporator cover 50 of the compartment 3 and detects the temperature of the freezer compartment 3, and the evaporator cover of the refrigerator compartment 4 50 refrigeration room temperature sensor (refrigeration room temperature detection means; storage room temperature sensor) 30 which is attached to 50 fan cover 50A and the like and detects the temperature of the refrigeration room 4, and outside air temperature sensor (outside air temperature detection means) which detects the outside air temperature. ) 32 is connected. The control panel 28 can arbitrarily set the set temperature TF of the freezer compartment 3 within a freezing temperature range of, for example, −22 ° C. to −18 ° C. centering on −20 ° C., and the set temperature TR of the refrigerator compartment 4. Can be arbitrarily set within a refrigeration temperature range of, for example, + 2 ° C. to + 6 ° C., centering on + 4 ° C. In addition to the above, the control panel 28 can change various settings, and also includes a display (alarm means) for displaying various information and alarms.

  Moreover, the compressor 13, the three-way valve 17, the freezer compartment blower 7F, the refrigerating compartment blower 7R, and the condenser blower 15 are connected to the output side of the control device 40. In this embodiment, the compressor 13 (compressor motor) is connected via the inverter device 31, whereby the control device 40 sets the operation frequency of the compressor 13 in addition to the operation and stop of the compressor 13. It can be arbitrarily controlled linearly between the lower limit value (G1: for example 30 Hz) and the upper limit value (G2: for example 80 Hz).

  Further, on the input side of the control device 40, the freezing room defrosting return temperature sensor 41, the refrigerating room defrosting return temperature sensor 42, the freezing room blower current transformer 43 for detecting the energization current of the freezing room blower 7F, A cold room blower current transformer 44 is connected to detect the energization current of the cold room blower 7R. Furthermore, on the output side of the control device 40, the freezer compartment defrost heater 46, the refrigerator compartment defrost heater 47, the refrigerator compartment condensation prevention heater 53, the freezer compartment drain pan heater 48, and the freezer compartment fan case heater 49. The refrigerator compartment drain pan heater 51 and the refrigerator compartment fan case heater 52 are connected.

  The control device 40 can control the energization rates of these heaters 46, 47, 48, 49, 51, 52, 53 between 0% and 100%. That is, the control device 40 stops the compressor 13 every predetermined time during the normal cooling operation described later, and energizes both defrost heaters 46 and 47, both drain pan heaters 48 and 51, and both fan case heaters 49 and 52. The defrosting operation of both evaporators 5 and 6 is executed. And if the temperature of each evaporator 5 and 6 rises to predetermined defrosting return temperature, a defrost operation will be complete | finished. This defrosting operation will be described in detail later. Further, the control device 40 energizes the refrigerating room condensation prevention heater 53 to prevent the occurrence of condensation on the surface of the partition walls 2A, 2B on the refrigerating room 4 side.

  With the above configuration, the operation of the cooling storage 1 of the embodiment will be described next with reference to the flowchart. During the normal cooling operation described below, the control device 40 includes the freezer compartment defroster heater 46, the refrigerator compartment defroster heater 47, the refrigerator compartment drain pan heater 48, the refrigerator compartment drain pan heater 51, the refrigerator compartment fan case heater 49, and the refrigerator compartment fan case. The heater 52 is not energized.

(1) Normal cooling operation When the power is turned on, the control device 40 starts the normal cooling operation by operating the compressor 13 and each of the fans 7F, 7R, and 15. The flowchart of FIG. 6 shows this normal cooling operation, and the control device 40 controls the compressor 13 and the three-way valve 17 so that each of the freezer compartment 3 and the refrigerator compartment 4 falls within the cooling temperature range by this normal cooling operation. Do.

  That is, when the set temperature TF (for example, −20 ° C.) of the freezer compartment 3 is set by the control panel 28, the freezer compartment cooling temperature range is set within a range above and below the set temperature TF including the set temperature TF. The In this case, the freezer compartment cooling temperature range is, for example, a temperature range between the freezer compartment lower limit temperature TFL (set temperature TF-2 ° C.) and the freezer compartment upper limit temperature TFH (set temperature TF + 2 ° C.). Similarly, when the set temperature TR (for example, + 4 ° C.) of the refrigerator compartment 4 is set on the control panel 28, the refrigerator compartment cooling temperature range is set within the range above and below the preset temperature TR including the preset temperature TR. . In this case, the refrigerating room cooling temperature range is, for example, a temperature range of the refrigerating room lower limit temperature TRL (set temperature TR-2 ° C.) or higher and the refrigerating room upper limit temperature TRH (set temperature TR + 2 ° C.) or lower. The differential temperature (2 ° C.) can be changed by the control panel 28.

  Assuming that the three-way valve 17 is in a state of supplying refrigerant to both the evaporators 5 and 6, the high-temperature refrigerant discharged from the compressor 13 is condensed by the condenser 14 and then refrigerated via the three-way valve 17. The flow is divided and flows into the capillary tube 18 on the chamber evaporator 5 side and the capillary tube 19 on the refrigerator compartment evaporator 6 side. The refrigerant decompressed by the capillary tubes 18 and 19 flows into the corresponding evaporators 5 and 6, respectively, where they evaporate and exhibit a cooling action.

  In addition, the control device 40 is operated continuously in the freezer compartment fan 7F, and continuously operated in the state where the refrigerant is supplied to the refrigerator compartment evaporator 6 in the refrigerator compartment fan 7R, and intermittently operated in the state where the refrigerant is not supplied. When these blowers 7F and 7R are operated, cold air is sucked from the freezer compartment 3 and the refrigerator compartment 4 below and discharged to the evaporators 5 and 6 at the rear. The cold air exchanges heat with the evaporators 5 and 6, and after cooling, is discharged from the back of the drain pan 20 into the chambers 3 and 4. Thereby, the inside of the freezer compartment 3 and the refrigerator compartment 4 are each cooled.

  The low-temperature refrigerant evaporated in the evaporators 5 and 6 flows out of the evaporators 5 and 6 and then flows into the refrigerant pipes 22 and 23, respectively, where the relatively high temperature refrigerant flows in the capillary tubes 18 and 19. After the heat exchange, the merging portion 24 joins and returns to the compressor 13 through the suction pipe 25.

  The controller 40 determines whether or not the temperature of the freezer compartment 3 detected by the freezer temperature sensor 29 in step S1 of FIG. 6 is equal to or higher than the freezer compartment upper limit temperature TFH (set temperature TF + 2 ° C.). Next, it is determined whether the temperature of the refrigerator compartment 4 detected by the refrigerator compartment temperature sensor 30 is equal to or higher than the refrigerator compartment upper limit temperature TRH (set temperature TR + 2 ° C.). If so, the process proceeds to step S11 and the three-way valve 17 is turned on. Control is performed so that the refrigerant flows through both the evaporators 5 and 6. In step S11, the control device 40 determines the operation amount from the PID calculation result based on the deviation e between the current temperature of the freezer compartment 3 and the refrigerator compartment 4 and the set temperature TF, TR (in the freezer compartment and the refrigerator compartment). The operation frequency of the compressor 13 is controlled (PID control).

  When the temperature of the refrigerator compartment 4 is lower than the refrigerator upper limit temperature TRH in step S8, the control device 40 proceeds to step S9, determines whether or not the temperature of the refrigerator compartment 4 is equal to or lower than the refrigerator compartment lower limit temperature TRL. In some cases, the process proceeds to step S13, and the three-way valve 17 is switched to a state in which only the freezer evaporator 5 is allowed to flow. Further, the compressor 13 performs PID control based on the temperature of the freezer compartment 3. If the temperature of the refrigerator compartment 4 is higher than the refrigerator compartment lower limit temperature TRL in step S9, the control device 40 proceeds to step S10 and determines whether or not the refrigerant is currently being cooled by flowing the refrigerant into the refrigerator compartment evaporator 6, If it is flowing (that is, while the temperature is being lowered to the lower limit temperature), the process proceeds to step S11. If it is not flowing (that is, the temperature is being increased to the upper limit temperature), the process proceeds to step S13.

  When the temperature of the freezer compartment 3 is lower than the freezer upper limit temperature TFH (set temperature TF + 2 ° C.) in step S1 of FIG. 6, the process proceeds to step S2, and the temperature of the freezer compartment 3 is changed to the freezer compartment lower limit temperature TFL (set temperature TF-2). If it is below, the process proceeds to step S4, and it is determined whether the temperature of the refrigerating room 4 is equal to or higher than the refrigerating room upper limit temperature TRH (set temperature TR + 2 ° C.). Then, the three-way valve 17 is controlled so as to allow the refrigerant to flow only into the refrigerator compartment evaporator 6. In step S <b> 12, the control device 40 performs PID control on the operating frequency of the compressor 13 based on the temperature of the refrigerator compartment 4.

  If the temperature of the refrigerator compartment 4 is lower than the refrigerator upper limit temperature TRH in step S4, the control device 40 proceeds to step S5, determines whether or not the temperature of the refrigerator compartment 4 is equal to or lower than the refrigerator compartment lower limit temperature TRL. In this case, the process proceeds to step S7, where the three-way valve 17 is closed so that no refrigerant flows through any of the evaporators, and the compressor 13 is stopped. When the temperature of the refrigerator compartment 4 is higher than the refrigerator compartment lower limit temperature TRL in step S5, the control device 40 proceeds to step S6 and determines whether or not the refrigerant is currently cooled by flowing the refrigerant into the refrigerator compartment evaporator 6, If it is flowing (that is, while the temperature is being lowered to the lower limit temperature), the process proceeds to step S12. If it is not flowing (that is, the temperature is being increased to the upper limit temperature), the process proceeds to step S7.

  When the temperature of the freezer compartment 3 is higher than the freezer compartment lower limit temperature TFL (set temperature TF-2 ° C.) in step S2, the control device 40 proceeds to step S3 and is currently cooling by flowing the refrigerant into the freezer compartment evaporator 5. If it is flowing (that is, while the temperature is being lowered to the lower limit temperature), the process proceeds to step S8. If not flowing (that is, the temperature is being raised to the upper limit temperature), the process proceeds to step S4. move on. By controlling the compressor 13 and the three-way valve 17 as described above, the control device 40 allows the temperatures of the freezer compartment 3 and the refrigerator compartment 4 to be within the freezer compartment cooling temperature range (set temperature TF: −22 ° C. centering on −20 ° C. -18 ° C range) and refrigerator compartment cooling temperature range (set temperature TR: + 2 ° C to + 6 ° C centered on + 4 ° C).

(2) Defrosting operation By the cooling operation as described above, the freezer compartment evaporator 5, the refrigerator compartment evaporator 6, and the upper surface of the drain pan 20 on the lower side of each evaporator 5, 6 and the front freezer compartment fan 7F, Frost grows around the refrigerator fan 7R. This frost formation hinders heat exchange between the evaporators 5 and 6 and the air, and also increases the ventilation resistance. Therefore, the control device 40 can control the evaporators 5 and 6 every predetermined time (for example, 6 hours). Perform defrosting operation. FIG. 7 is a flowchart showing the defrosting operation. When 6 hours accumulated by the timer 27 have elapsed, the control device 40 performs the compressor 13, the condenser fan 15, and the freezer compartment fan 7F in step S14 of the flowchart of FIG. Then, the refrigerating room blower 7R is stopped, and the freezing room defrosting heater 46, the refrigerating room defrosting heater 47, the freezing room drain pan heater 48, the freezing room fan case heater 49, the refrigerating room drain pan heater 51, and the refrigerating room fan case heater 52 are energized. To do.

  The freezer compartment evaporator 5 is heated by energization of the freezer compartment defroster heater 46, and the refrigerator compartment evaporator 6 is heated by energization of the refrigerator compartment defroster heater 47, and the frosting of the evaporators 5 and 6 is melted. It will be done. Further, the energization of the freezer drain pan heater 48 and the freezer fan case heater 49 heats the drain pan 20 of the freezer compartment 3 and the vicinity of the freezer blower 7F including the fan case, and the drain pan 20 and the freezer compartment fan 7F vicinity. Frost (ice) is also melted.

  Next, in step S15, the control device 40 determines the temperatures of the evaporators 5 and 6 based on the temperatures of the evaporators 5 and 6 detected by the freezer defrosting temperature sensor 41 and the refrigerator defrosting temperature sensor 42, respectively. For example, it is determined whether or not the temperature has risen to a predetermined defrosting return temperature such as + 10 ° C. When the temperature of both the evaporators 5 and 6 has not risen to this defrosting return temperature, the control device 40 returns to step S14 and continues the defrosting operation. In addition, the temperature when all the frost formation of the evaporators 5 and 6 melt | dissolves shall be measured beforehand, and the temperature shall be preset as a defrosting return temperature.

  And when the temperature of both the evaporators 5 and 6 rises to defrosting return temperature, it progresses to step S16, the both defrost heaters 47 and 48 are de-energized, and defrost operation is complete | finished. If the temperature of one of the evaporators rises to the defrosting return temperature first, energization to the defrosting heater of the evaporator is stopped at that time, but the other evaporator is kept waiting. Wait for the temperature to rise to the defrosting return temperature. And when the temperature of both the evaporators 5 and 6 rose to the defrosting return temperature, the control device 40 proceeds to step S16, ends the defrosting operation, and proceeds to step S17.

  In step S17, the control device 40 stands by for a predetermined draining time (for example, 5 minutes). When the operation of the blowers 7F and 7R is started with the melted water attached to the evaporators 5 and 6, it is scattered to the freezer compartment 3 and the refrigerator compartment 4 and becomes ice again by the cooling operation. Wait for dripping on 20 At this time, the freezer compartment drain pan heater 48, the freezer compartment fan case heater 49, the refrigerator compartment drain pan heater 51, and the refrigerator compartment fan case heater 52 are continuously energized. Therefore, the frost that has fallen into the drain pan 20 as ice blocks from the evaporators 5 and 6 is melted on the drain pan 20.

  And if the said draining time passes, the control apparatus 40 will progress to step S18 from step S17, and will start the freezer compartment fan 7F and the refrigerator compartment fan 7R first. Next, it progresses to step S19 and the freezer compartment fan 7F and the refrigerator compartment fan 7R are rotating based on the energizing current of both the fans 7F and 7R detected by the freezer compartment fan current transformer 43 and the refrigerator compartment fan current transformer 44. Judge.

  When the freezer compartment fan 7F and the refrigerator compartment fan 7R are normally rotated, the energization currents detected by the freezer compartment fan current transformer 43 and the refrigerator compartment fan current transformer 44 are normal values. When the energization currents of both the fans 7F and 7R are normal values in step S19, the control device 40 proceeds to step S20, and the freezer compartment drain pan heater 48, the freezer compartment fan case heater 49, the refrigerator compartment drain pan heater 51, and the refrigerator compartment. The energization to the fan case heater 52 is stopped, and the compressor 13 and the condenser blower 15 are activated to return to the normal cooling operation.

  On the other hand, due to the low temperature of the evaporators 5 and 6 as described above, for example, there is much frost formation around the freezer blower 7F, and the freezer drain pan heater 48 and the freezer fan case heater 49 up to that point are used. The frost formation around the freezer blower 7F cannot be melted even by heating by the above, and it grows while the freezer blower 7F is stopped and freezes in the freezer blower 7F, so that only the freezer blower 7F cannot rotate. When it falls (lock state: the fan 7F cannot rotate due to ice), the energizing current detected by the freezer fan current transformer 43 becomes an abnormally high value (lock current).

  In this case, the control device 40 proceeds from step S19 to step S21, and continues energization of the freezer compartment drain pan heater 48 and the freezer compartment fan case heater 49 in the freezer compartment 3 while the compressor 13 is stopped. In addition, since the refrigerator air blower 7R is rotatable, the energization to the refrigerator compartment drain pan heater 51 and the refrigerator compartment fan case heater 52 is stopped.

  Then, in step S21, the control device 40 determines whether or not a predetermined melting time (for example, 10 minutes) has elapsed by the timer 27, and repeats steps S19 and 21 until it elapses to store the freezer drain pan heater 48 and the freezer fan. The energization of the case heater 49 is continued. During this melting time (while steps S19 and S20 are repeated), the control device 40 monitors the energization current detected by the freezer blower current transformer 43, and is controlled by the freezer drain pan heater 48 and the freezer fan case heater 49. When freezing is released by heating and the freezer compartment fan 7F is activated (rotatable), the control device 40 proceeds from step S19 to step S20 and returns to the normal cooling operation of both chambers 3 and 4.

  On the other hand, if the freezer compartment fan 7F cannot be started even after the melting time has elapsed (it cannot rotate), the control device 40 proceeds from step S21 to step S22 and energizes the freezer compartment drain pan heater 48 and the freezer compartment fan case heater 49. And the compressor 13 and the condenser blower 15 are started. For the normal refrigerator compartment 4 (the refrigerator compartment fan 7R is rotatable), the refrigerator compartment evaporator 6 is controlled by controlling the compressor 13 and the three-way valve 17 based on the temperature of the refrigerator compartment 4 detected by the refrigerator compartment temperature sensor 30. The normal cooling operation for controlling the refrigerant supply to the vehicle is restored.

  On the other hand, for the freezer compartment 3 in which the blower 7F cannot rotate, the compressor 13 and the three-way compressor 3 are based on the temperature of the freezer compartment evaporator 5 detected by the freezer compartment defrosting temperature sensor 41 that detects the temperature of the freezer evaporator 5. Control proceeds to a backup cooling operation in which the valve 17 is controlled to control the refrigerant supply to the freezer evaporator 5. As a result, the freezer compartment evaporator 5 starts to exhibit a cooling action, but since the freezer compartment blower 7F is stopped, the cold air becomes natural convection that descends from the freezer compartment evaporator 5 to the freezer compartment 3 below. That is, the inside of the freezer compartment 3 is cooled by natural convection of the cold air cooled by the freezer evaporator 5.

  The reason why the freezer defrosting return temperature sensor 41 is used in the backup cooling operation is that the freezer blower 7F cannot rotate, so that the cold air circulation in the freezer compartment 3 is not performed, and the freezer temperature sensor 29 cannot control the refrigerant supply. Because. In this case, the set temperature (temperature of the freezer compartment evaporator 5) used for temperature control of the freezer compartment 3 may be the set temperature TF in the normal cooling operation described above, and the temperature of the evaporator 5 is lower. It may be offset to a lower temperature value.

  Moreover, the control apparatus 40 performs the predetermined | prescribed warning display that the freezer compartment fan 7F was locked by the indicator (alarm means) of the control panel 28 by step S22. This makes it possible to promptly respond to the user.

  The control device 40 proceeds from step S22 to step S23, and determines whether or not the freezer compartment fan 7F is rotatable. And if rotation is impossible, it will return to step S22 and backup cooling operation will be continued about freezer compartment 3. On the other hand, when the ice around the freezer compartment fan 7F is melted or dropped and the freezer compartment fan 7F can be rotated in step S23 (when the freezer compartment fan 7F starts to rotate, detected by the freezer compartment fan current transformer 43), the control device 40 Advances to step S20, and the freezer compartment 3 is also returned to the normal cooling operation. Thereby, when the freezer compartment fan 7F returns to normal during the backup cooling operation, it can automatically return to the normal cooling operation.

  As described above, in the present invention, when the blowers 7F and 7R are rotatable after the defrosting operation of the evaporators 5 and 6, the drain pan heaters 48 and 51 and the fan case heaters 49 and 52 are energized. When the freezer blower 7F cannot rotate, for example, the control device 40 continues to energize the freezer drain pan heater 48 and the freezer fan case heater 51. The non-rotatable state (locked state) due to icing of the blower 7F is effectively melted by the heat from the freezer compartment drain pan heater 48 and the freezer compartment fan case heater 51 that are continuously energized after the completion of the defrosting operation, and the operation is possible. Can be recovered.

  When the freezer blower 7F becomes rotatable while the freezer drain pan heater 48 and the freezer fan case heater 51 are energized for a predetermined time, the control device 40 stops energizing the heaters 48 and 51. Thus, the normal cooling operation is restored, so that the occurrence of poor cooling of the freezer compartment 3 due to freezing of the freezer fan 7F can be effectively eliminated, and deterioration of the stored articles can be avoided in advance.

  On the other hand, if the freezer compartment fan 7F remains unrotatable even if the freezer drain pan heater 48 and the freezer fan case heater 51 are energized for a predetermined time, the control device 40 stops energizing the heaters 48 and 51, Based on the temperature of the freezer compartment evaporator 5 detected by the freezer compartment defrosting return temperature sensor 41, the backup cooling operation for controlling the refrigerant supply to the freezer compartment evaporator 5 is executed. Cold air from the freezer evaporator 5 is naturally convected to the freezer room 3 where the cold air circulation is no longer performed, and the refrigerant supply is controlled by the temperature of the freezer room evaporator 5 to cool the inside of the freezer room 3 as much as possible. Will be able to. As a result, it is possible to avoid or minimize the deterioration of the stored articles.

  In this case, although the backup cooling operation is performed for the freezer compartment 3, the refrigerating chamber 4 in which the refrigerating chamber blower 7R can rotate is returned to the normal cooling operation, so that the freezer compartment 3 is cooled as much as possible by the backup cooling operation. However, the normal refrigerator compartment 4 can be returned to the normal cooling operation. As a result, while the normal refrigerator compartment 4 is cooled without hindrance, deterioration of stored articles can be avoided or minimized for the freezer compartment 3 in which the freezer fan 7F cannot rotate.

  In addition, although the said Example demonstrated the case where only the freezer compartment fan 7F became non-rotatable, when only the refrigerating room fan 7R became non-rotatable, the above-mentioned freezer compartment 3 and the refrigerating room 4 were reverse. Just like this, the same control is performed. Further, the same applies to the case where both of the fans 7F and 7R have become unrotatable. In this case, the backup cooling operation is executed for both the freezer compartment 3 and the refrigerator compartment 4 in step S22.

  Further, in the embodiment, the present invention has been described with the freezer compartment 3 and the refrigerator compartment 4 and the respective cooling storages provided with the evaporators 5 and 6 and the fans 7F and 7R. Claims related to claims 1 and 2 As for, the present invention is effective even in a single storage room, that is, a freezer having only a freezing room or a refrigerator having only a freezing room. In particular, in the embodiment, the refrigerant supply to each of the evaporators 5 and 6 is controlled by the three-way valve 17, but not limited to the control using such a valve, a freezer or refrigerator having a single evaporator is used. In this case, the present invention includes the case where the refrigerant supply / stop is controlled by the operation / stop of the compressor 13.

  Moreover, in the claim related to Claim 2, it is effective in the cool storage store | warehouse | chamber in which the several air blower was provided in the storage room (a freezing room or a refrigerator room or one of them). In particular, if the blower corresponding to the fan cover to which the storage room temperature sensor is attached remains unrotatable even after the defrosting operation has been completed for a predetermined time after the defrosting operation is completed, the cold air is not sucked in and stored. The temperature of the room (freezer or freezer) cannot be detected. In such a case, a backup cooling operation is performed, the rotatable blower is operated to ensure a minimum cold air circulation, and the temperature of the evaporator (if it is offset to a value lower than the predetermined temperature, the temperature of the storage room). If the refrigerant supply to the evaporator is controlled in the alternative, the storage chamber can be cooled as accurately as possible, and deterioration of the stored articles can be minimized.

  Further, in the embodiment, the drain pan heaters 48 and 51 and the fan case heaters 49 and 52 are provided as ice melting heaters that contribute to the ice melting of the blowers 7F and 7R. There may be.

  Furthermore, in the embodiment, the current transformers 43 and 44 detect the energization currents of the fans 7F and 7R. However, the present invention is not limited to this, and other current detection means such as a resistor (shunt resistor) may be used for detection. Also good.

1 Cooling storage 2 Heat insulation box 3 Freezer room (storage room)
4 Refrigerated room (storage room)
5 Freezer compartment evaporator (evaporator)
6 Cold room evaporator (evaporator)
7F Freezer Blower (Blower)
7R refrigerator compartment fan (blower)
13 Compressor 14 Condenser 17 Three-way valve 18, 19 Capillary tube 21 Cooling chamber 28 Control panel (input means)
29 Freezer temperature sensor (storage room temperature sensor)
30 Cold room temperature sensor (storage room temperature sensor)
32 Outside temperature sensor 40 Control device (control means)
41 Freezing room defrosting return temperature sensor (Defrosting return temperature sensor)
42 Refrigerating room defrost recovery temperature sensor (Defrost recovery temperature sensor)
43 Freezer compartment fan current transformer 44 Refrigerator compartment fan current transformer 46 Freezer compartment defrost heater (defrost heater)
47 Refrigerating room defrost heater (defrost heater)
48 Freezer compartment drain pan heater (freezing and melting heater)
49 Freezer compartment fan case heater (freezing and melting heater)
51 Cold room drain pan heater (freezing and melting heater)
52 Cold room fan case heater (freezing and melting heater)

Claims (8)

In a cold storage that cools by supplying cold air exchanged with the evaporator to the storage room by a blower,
A defrost heater for defrosting the evaporator;
Freezing and melting heater provided near the blower and contributing to freezing and melting of the blower,
A storage room temperature sensor for detecting the temperature in the storage room;
A defrosting return temperature sensor for detecting a predetermined defrosting return temperature of the evaporator;
Based on the output of these temperature sensors, the refrigerant supply to the evaporator, and a control means for controlling the blower, the defrosting heater and the freezing and melting heater,
The control means executes a cooling operation of the storage chamber by controlling the refrigerant supply to the evaporator and the blower based on the temperature of the storage chamber detected by the storage chamber temperature sensor,
The refrigerant supply to the evaporator and the blower are stopped, the defrosting operation of the evaporator is executed by energizing the defrosting heater and the icing melting heater, and the defrosting operation is completed when the defrosting operation ends. And stop energizing
After completion of the defrosting operation, when the blower is rotatable, the energization to the freezing and melting heater is stopped to return to the cooling operation, and when it is impossible to rotate, the freezing and melting heater is continuously energized. Cooling storage characterized by that.   A plurality of the blowers are provided, and when all the blowers are rotatable after the defrosting operation is completed, energization to the freezing and melting heater is stopped and the cooling operation is resumed, and any of the blowers is rotated. 2. The cooling storage according to claim 1, wherein when it is impossible, the ice melting and melting heater is continuously energized. A freezer compartment evaporator that cools the freezer compartment and a refrigerator compartment evaporator that cools the refrigerator compartment, and the refrigerant compressed by the compressor is respectively supplied to the freezer compartment evaporator and the refrigerator compartment evaporator via the decompression means. In the cold storage that supplies and cools the cold air that is distributed and supplied and exchanged heat with each evaporator by the freezer and refrigerator compartment fans,
A freezer defrost heater and a refrigerator defrost heater for defrosting each of the evaporators;
Freezing room freezing and melting heaters and freezing room freezing and melting heaters that are provided in the vicinity of each of the blowers and contribute to freezing and melting of each blower,
A freezer temperature sensor and a refrigerator temperature sensor for detecting the temperature of each room,
A freezing room defrosting temperature sensor and a refrigerating room defrosting temperature sensor for detecting a predetermined defrosting temperature of each evaporator;
Based on the output of these temperature sensors, it is provided with a refrigerant supply to each evaporator, and a control means for controlling each of the blowers, each defrosting heater and each freezing and melting heater,
The control means controls the refrigerant supply to each of the evaporators and each of the blowers based on the temperatures of the freezing room and the refrigerating room detected by the freezing room temperature sensor and the refrigerating room temperature sensor, respectively. Perform cooling operation,
The compressor and each blower are stopped, the defrosting operation of each evaporator is executed by energizing each defrosting heater and each freezing and melting heater, and to each defrosting heater when the defrosting operation ends. And stop energizing
After completion of the defrosting operation, when each of the fans is rotatable, the energization to each of the ice melting heaters is stopped to return to the cooling operation, and when any of the fans is not rotatable, A cooling storage, characterized in that power is continuously supplied to an ice melting heater in a chamber provided with the non-rotatable blower.   The control means stops the energization to the freezing and melting heater and stops the cooling operation when the blower becomes rotatable while the freezing and melting heater is energized for a predetermined time after the defrosting operation. The cooling storage according to any one of claims 1 to 3, wherein the cooling storage is returned to step (a).   The control means stops energization to the freezing and melting heater if the blower is unable to rotate even if the freezing and melting heater is energized for a predetermined time after completion of the defrosting operation, and the defrosting return temperature sensor The cooling storage according to claim 1, wherein a backup cooling operation for controlling the supply of refrigerant to the evaporator is executed based on the temperature of the evaporator detected by the engine.   The control means stops energization of the freeze-thaw heater and operates the rotatable blower when the blower is not rotatable even if the freeze-thaw heater is energized for a predetermined time after completion of the defrosting operation. The cooling storage according to claim 2, wherein a backup cooling operation for controlling the supply of refrigerant to the evaporator of the chamber is executed based on the temperature of the evaporator detected by the defrosting return temperature sensor. .   The control means stops energization of the freezing and melting heater if the blower cannot rotate even if the freezing and melting heater is energized for a predetermined time after completion of the defrosting operation, and the non-rotatable blower is turned off. For the provided chamber, a backup cooling operation for controlling the refrigerant supply to the evaporator of the chamber based on the temperature of the evaporator detected by the defrosting return temperature sensor is performed, and the rotatable blower is provided. The cooling storage according to claim 3, wherein the chamber is returned to the cooling operation.   The cooling storage according to any one of claims 5 to 7, wherein the control means issues a predetermined alarm when the backup cooling operation is executed.

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