JP2013200081A - Cooling storage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To settle the problem of abnormal temperature rising quickly with no trouble which occurs in a cooling storage that cools respective chambers by distributing refrigerant to a freezing chamber evaporator and a cooling chamber evaporator.SOLUTION: In a case where respective chambers are at a predetermined freezing chamber high temperature threshold value and cooling chamber high temperature threshold value, being higher than a cooling temperature range, a state, in which the temperature of a cooling chamber is at the cooling chamber high temperature threshold value or higher, continues for predetermined hours, and the temperature of a freezing chamber is at the freezing chamber high temperature threshold value or lower, a control device executes a cooling temperature priority cooling mode which supplies refrigerant to a cooling temperature evaporator 6 in preference to a freezing chamber evaporator 5.

Description

  The present invention relates to a cooling storehouse that cools a freezer compartment and a refrigerator compartment by distributing and supplying refrigerant compressed by a compressor to a freezer compartment evaporator and a refrigerator compartment evaporator via decompression means. It is.

  Conventionally, in this type of cold storage, a refrigerant circuit is composed of a compressor, a condenser, a refrigerator compartment evaporator connected via a capillary tube, and a freezer compartment evaporator connected via another capillary tube. It is configured. 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 refrigeration cycle was evaporated in each of these and returned to the compressor.

  In this case, the capillary tubes connected to the respective evaporators are configured with arbitrary diameters and lengths, thereby setting the evaporation temperatures in the respective evaporators and setting the predetermined temperatures in the refrigerator compartment and the freezer compartment, respectively. Cool to the temperature zone.

  In addition, the refrigerator temperature chamber and the freezer compartment are each provided with an internal temperature sensor for detecting the internal temperature, and the control of the three-way valve and the compressor is performed so that each indoor is within the set cooling temperature range. (For example, refer to Patent Document 1).

Japanese Patent No. 3922891

  Thus, in a cooling storage room that has a freezer compartment and a refrigerator compartment and distributes the refrigerant to the evaporators of each compartment, the door of one of the chambers is opened for a long time for food in and out or closed incompletely. If it is left in a half-open state, the temperature of the chamber will rise abnormally due to the intrusion of outside air. Therefore, in order to prevent the articles stored in the room from deteriorating, the temperature of the room must be lowered as quickly as possible. However, the refrigerant is supplied to the other room so that the temperature falls within the cooling temperature range. There is a problem that it is difficult to quickly cool a room whose temperature has risen abnormally.

  The present invention has been made in order to solve the conventional technical problems, and an abnormal temperature rise that occurs in a cooling storage that distributes and supplies refrigerant to the freezer evaporator and the refrigerator refrigerator and cools each chamber. The purpose is to solve the problem quickly and without any trouble.

  In order to solve the above problems, the cooling storage of the present invention has a freezer compartment evaporator for cooling the freezer compartment and a refrigerator compartment evaporator for cooling the refrigerator compartment, and each of the refrigerant compressed by the compressor is decompressed. Each of the chambers is cooled by being distributed and supplied to the freezer evaporator and the refrigerator compartment evaporator, and the temperature of the freezer compartment and the refrigerator compartment temperature are respectively detected. Based on the temperature of the sensor and the freezing room and the refrigerating room detected by each temperature sensor, the temperature of each room is set to a predetermined cooling temperature range including the set temperature set for each room. And a control means for controlling the operation of the compressor. The control means has a predetermined freezer compartment high temperature threshold value and a refrigerator compartment high temperature threshold value that are higher than the cooling temperature range of each chamber, and the temperature of the refrigerator compartment is Refrigeration room temperature rises above the high temperature threshold If the state continues for a predetermined time and the temperature of the freezer compartment is equal to or lower than the freezer compartment high temperature threshold, the refrigerator compartment priority cooling mode for supplying refrigerant to the refrigerator compartment evaporator in preference to the freezer compartment evaporator is executed. It is characterized by that.

  According to a second aspect of the present invention, there is provided the cooling storage unit according to the above invention, wherein the control means is configured such that when the temperature of the refrigerator compartment decreases to any value in the cooling temperature range, or the temperature of the freezer compartment rises above the freezer compartment high temperature threshold. When the state of being kept continues for a predetermined time, the refrigerator compartment priority cooling mode is terminated.

  According to a third aspect of the present invention, there is provided the cooling storage device according to each of the above-mentioned inventions, wherein the control means continues the state in which the temperature of the freezer compartment has risen above the high temperature threshold value for the freezer compartment for a predetermined time, and the temperature of the refrigerator compartment is refrigerated. When the temperature is equal to or lower than the room high temperature threshold, the freezer compartment priority cooling mode for supplying the refrigerant to the freezer compartment evaporator in preference to the refrigerator compartment evaporator is executed.

  The cooling storage of the invention of claim 4 has a freezer compartment evaporator for cooling the freezer compartment and a refrigerating compartment evaporator for cooling the refrigerating compartment, and the refrigerant compressed by the compressor is refrigerated through decompression means, respectively. Each chamber is cooled by being distributed and supplied to the room evaporator and the cold room evaporator, and each of the freezer temperature sensor and the cold room temperature sensor for detecting the temperature of the freezer room and the cold room, Based on the temperature of the freezer compartment and the refrigerator compartment detected by the temperature sensor, the supply of refrigerant to each evaporator so that the temperature of each compartment falls within a predetermined cooling temperature range including a set temperature set for each compartment. Control means for controlling the operation of the compressor, the control means has a predetermined freezer compartment high temperature threshold value and a refrigerator compartment high temperature threshold value that are higher than the cooling temperature range of each room, and the temperature of the freezer room is the freezer compartment high temperature threshold value. The state of rising above is the predetermined time If the temperature of the refrigerator compartment is continued and the temperature of the refrigerator compartment is equal to or lower than the refrigerator compartment high temperature threshold, the refrigerator compartment priority cooling mode for supplying refrigerant to the refrigerator compartment evaporator in preference to the refrigerator compartment evaporator is executed. To do.

  According to a fifth aspect of the present invention, there is provided the cooling storage device according to the third or fourth aspect, wherein the control means is configured such that the temperature of the freezer compartment decreases to any value in the cooling temperature range, or the temperature of the refrigerator compartment is refrigerated. The freezer compartment preferential cooling mode is terminated when the temperature rising above the room high temperature threshold continues for a predetermined time.

  According to a sixth aspect of the present invention, there is provided the cooling storage device according to each of the above-mentioned inventions, wherein the control means has a state in which the temperature of the freezer compartment is in the cooling temperature range and the temperature of the refrigerator compartment has deviated from the cooling temperature range for a predetermined time. When it continues, it is characterized in that the refrigerant is not supplied to the freezer compartment evaporator but switched to a state in which the refrigerant is supplied to the refrigerator compartment evaporator.

  According to a seventh aspect of the present invention, there is provided the cooling storage according to each of the above inventions, wherein the control means is configured such that the temperature in the refrigerator compartment is in the cooling temperature range and the temperature in the freezer compartment deviates from the cooling temperature range for a predetermined time. When the operation is continued, the refrigerant is not supplied to the refrigerator compartment evaporator, but is switched to a state in which the refrigerant is supplied to the freezer compartment evaporator.

  In the cooling storage of the invention according to claim 8, in each of the above-mentioned inventions, the control means is predetermined when the temperature of the refrigerator compartment and the freezer compartment has risen above the refrigerator compartment high temperature threshold and the freezer compartment high temperature threshold for a predetermined time. The duty control mode for supplying the refrigerant alternately to the two evaporators at the duty of

  The cooling storage of the invention of claim 9 is characterized in that, in the above invention, the control means ends the duty control mode when the temperature of the refrigerator compartment or the freezer compartment is lowered to any value in the cooling temperature range.

  The cooling storage of the invention of claim 10 is controlled by the control means in each of the above inventions, and selectively supplies refrigerant to only one of the evaporators, and supplies refrigerant to both evaporators simultaneously. And a three-way valve capable of realizing the state to be achieved, and each decompression means is constituted by a capillary tube.

  According to invention of Claim 1, it has a freezer compartment evaporator which cools a freezer compartment, and a refrigerator compartment evaporator which cools a refrigerator compartment, The refrigerant | coolant compressed by the compressor is each freezer compartment via a decompression means. Freezing room temperature sensor, refrigerating room temperature sensor, and each temperature sensor for detecting temperatures of the freezing room and the refrigerating room, respectively, in a cooling storage unit configured to cool each room by distributing and supplying to the evaporator and the refrigerating room evaporator The refrigerant supply to each evaporator and the compressor so that the temperature of each chamber falls within a predetermined cooling temperature range including a set temperature set for each chamber based on the temperature of the freezer compartment and the refrigerator compartment detected by Control means for controlling the operation of the storage room, and the control means has a predetermined freezer compartment high temperature threshold value and a refrigerator compartment high temperature threshold value that are higher than the cooling temperature range of each room, and the temperature of the refrigerator compartment is equal to or higher than the refrigerator compartment high temperature threshold value. Ascending state for a predetermined time If the temperature of the freezer compartment is continued and the freezer compartment temperature is equal to or lower than the freezer compartment high temperature threshold, the refrigerator compartment priority cooling mode for supplying the refrigerant to the refrigerator compartment evaporator in preference to the refrigerator compartment evaporator is executed. When the temperature of the refrigerating room rises abnormally due to the opening of the door, etc., and the condition continues for a predetermined time, the refrigerating room preferential cooling mode is executed and refrigerant is preferentially supplied to the refrigerating room evaporator. In addition, the refrigerator can be rapidly cooled to rapidly reduce the temperature, and deterioration of the stored articles can be avoided in advance.

  In this case, since the refrigerator compartment priority cooling mode is executed only when the temperature of the freezer compartment is equal to or lower than the freezer compartment high temperature threshold, it is possible to prevent an abnormal temperature rise in the freezer compartment.

  Further, according to the invention of claim 2, in addition to the above-mentioned invention, the control means, when the temperature of the refrigerator compartment is lowered to any value in the cooling temperature range, or the temperature of the freezer compartment is equal to or higher than the freezer compartment high temperature threshold. When the temperature rising state continues for a predetermined time, the refrigerator compartment priority cooling mode is terminated, so there is a disadvantage that the temperature of the freezer compartment rises abnormally while the refrigerator compartment priority cooling mode is being executed. This can be avoided.

  Further, according to the invention of claim 3, in addition to the above-mentioned inventions, the control means is such that the state where the temperature of the freezer compartment is rising above the freezer compartment high temperature threshold has continued for a predetermined time, and the refrigerator compartment When the temperature is equal to or lower than the freezer compartment high temperature threshold, the freezer compartment priority cooling mode for supplying refrigerant to the freezer compartment evaporator is executed in preference to the refrigerator compartment evaporator. If the temperature rises abnormally and the condition continues for a predetermined time, the freezer compartment priority cooling mode is executed and this time the refrigerant is preferentially supplied to the freezer compartment evaporator to quickly cool the freezer compartment. As a result, the temperature is rapidly lowered, and deterioration of the stored articles can be avoided in advance. Also in this case, since the freezer compartment priority cooling mode is executed only when the temperature of the refrigerator compartment is equal to or lower than the refrigerator compartment high temperature threshold, it is possible to prevent an abnormal temperature rise in the refrigerator compartment.

  According to invention of Claim 4, it has a freezer compartment evaporator which cools a freezer compartment, and a refrigerator compartment evaporator which cools a refrigerator compartment, The refrigerant | coolant compressed with the compressor is each freezer compartment via pressure reduction means Freezing room temperature sensor, refrigerating room temperature sensor, and each temperature sensor for detecting temperatures of the freezing room and the refrigerating room, respectively, in a cooling storage unit configured to cool each room by distributing and supplying to the evaporator and the refrigerating room evaporator The refrigerant supply to each evaporator and the compressor so that the temperature of each chamber falls within a predetermined cooling temperature range including a set temperature set for each chamber based on the temperature of the freezer compartment and the refrigerator compartment detected by Control means for controlling the operation of the storage room, and the control means has a predetermined freezer compartment high temperature threshold value and a refrigerating room high temperature threshold value that are higher than the cooling temperature range of each room, and the temperature of the freezer room is equal to or higher than the freezer compartment high temperature threshold value. Ascending state for a predetermined time If the temperature of the refrigerating room continues and the temperature of the refrigerating room is equal to or lower than the refrigerating room high temperature threshold, the freezing room preferential cooling mode for supplying the refrigerant to the freezing room evaporator in preference to the refrigerating room evaporator is executed. If the temperature of the freezer compartment rises abnormally due to the opening of the door, etc., and the state continues for a predetermined time, the freezer compartment preferential cooling mode is executed and refrigerant is preferentially supplied to the freezer compartment evaporator. In addition, the freezer compartment is rapidly cooled to rapidly reduce the temperature, and deterioration of the stored articles can be avoided in advance.

  In this case, since the freezer compartment priority cooling mode is executed only when the temperature of the refrigerator compartment is equal to or lower than the refrigerator compartment high temperature threshold, it is possible to prevent an abnormal temperature rise in the refrigerator compartment.

  Further, according to the invention of claim 5, in addition to the invention of claim 3 or claim 4, the control means is provided when the temperature of the freezer compartment decreases to any value in the cooling temperature range, or of the refrigerator compartment. If the temperature rises above the refrigerator compartment high temperature threshold for a predetermined time, the freezer compartment priority cooling mode is terminated, so the refrigerator compartment temperature rises abnormally while the freezer compartment preferred cooling mode is being executed. It is possible to avoid the inconvenience that occurs.

  According to the invention of claim 6, in addition to each of the above inventions, the control means has a predetermined state in which the temperature of the freezer compartment is in the cooling temperature range and the temperature of the refrigerator compartment deviates from the cooling temperature range. If the time is continued, the refrigerant is not supplied to the freezer evaporator and the refrigerant is supplied to the refrigerator freezer, so that the refrigerant is supplied to both the freezer evaporator and the refrigerator freezer. When the freezing room is cooled to the cooling temperature range and the refrigerating room gradually rises from the cooling temperature range, the refrigerant is supplied only to the refrigerating room evaporator to quickly raise the temperature of the refrigerating room. It is possible to lower it. As a result, it is possible to quickly resolve the so-called single-cooled state in which the freezer compartment is cold but the refrigerator compartment is not.

  According to the invention of claim 7, in addition to each of the above inventions, the control means has a predetermined condition that the temperature of the refrigerator compartment is in the cooling temperature range and the temperature of the freezer compartment deviates from the cooling temperature range. If the time is continued, the refrigerant is not supplied to the refrigerator compartment evaporator but switched to a state in which the refrigerant is supplied to the freezer evaporator, so that the refrigerant is supplied to both the refrigerator compartment evaporator and the refrigerator compartment evaporator. When the refrigerator compartment is cooled to the cooling temperature range and the freezer compartment temperature gradually rises above the cooling temperature range, the refrigerant is supplied only to the freezer evaporator to quickly raise the temperature of the freezer compartment. It is possible to lower it. As a result, it is possible to quickly eliminate the so-called one-sided cooling state in which the refrigerator compartment is cold but the freezer compartment is not cooled.

  According to the invention of claim 8, in each of the above inventions, the control means is configured to perform a predetermined operation when a state where the temperature of the refrigerator compartment and the freezer compartment has risen above the refrigerator compartment high temperature threshold and the refrigerator compartment high temperature threshold continues for a predetermined time. Since the duty control mode is executed in which the refrigerant is alternately supplied to both evaporators with a duty, if both the refrigerator compartment and the freezer compartment are in an abnormally high temperature state, the refrigerant is alternately supplied to each evaporator. Then, both chambers are alternately concentrated and cooled, and as a result, the temperature of both chambers can be quickly lowered.

  In this case, as in the ninth aspect of the invention, if the control means ends the duty control mode when the temperature of the refrigerator compartment or the freezer compartment is lowered to any value in the cooling temperature range, When the temperature rise in the room is eliminated, the normal cooling state can be restored without any trouble.

  Then, as controlled by the control means as in the invention of claim 10, a state in which the refrigerant is selectively supplied to only one of the evaporators and a state in which the refrigerant is simultaneously supplied to both evaporators are realized. In a cooling storage having a possible three-way valve and each decompression means constituted by a capillary tube, the refrigerant flow into each evaporator is finely adjusted as in the case of using an electronic expansion valve for each evaporator. In particular, the above inventions are particularly effective.

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 priority cooling mode which the control apparatus of FIG. 5 performs. It is a flowchart explaining the single-sided cooling elimination control which the control apparatus of FIG. 5 performs. It is a flowchart explaining the duty control 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 heat insulation doors 8 and 9 of the cooling storage 1 to which this invention is applied. The cooling storage 1 according to the embodiment is a vertical commercial refrigerator-freezer installed in a kitchen of a hotel or a restaurant, and includes a heat insulating box 2 that opens to the front.

  In the cooling storage 1 of FIG. 1, a freezer compartment (F) 3 and a refrigerator compartment (R) 4 as storage compartments are formed by partitioning the inside of the heat insulation 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 so as to be freely opened and closed by two sets of double-spread type heat insulation doors 8, 9, 9, 9 provided above and below.

  In addition, 10 in the figure divides the front opening of the heat insulation box 2 vertically at the same height as the partition wall 2B, and makes contact with and adheres to the back of the heat insulation doors 8 and 9 when they are closed. It is a partition for.

  The freezer compartment evaporator 5 which comprises the cooling device 16 of the cooling storage 1 is arrange | positioned at the upper part of the freezer compartment 3, This freezer compartment evaporator 5 and the freezer compartment blower 7F (FIG. 7) attached to the front side vicinity. 5), the inside of the freezer compartment 3 is cooled to a predetermined freezer compartment cooling temperature range. Further, a refrigeration room evaporator 6 constituting the cooling device 16 is also arranged at the upper part of the refrigeration room 4, and the refrigeration room is blown by the refrigeration room evaporator 6 and a refrigeration room blower 7R attached in the vicinity of the front side thereof. The inside of 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 melting the frost on the freezer compartment evaporator 5 and performing defrosting. A freezer compartment defrosting temperature sensor 41 for detecting the recovery temperature (for example, + 10 ° C.) is attached. Further, the drain pan 20 located below the freezer evaporator 5 has a freezer drain pan heater 48 (FIG. 5) that functions as an ice melting heater that melts or contributes to the freezing of the drain pan 20 and the freezer blower 7F. Is attached to the fan case 55 to which the freezer compartment fan 7F is attached, and a freezer compartment fan case heater 49 that functions as an ice melting and melting heater that also melts or contributes to freezing of the freezer compartment fan 7F. It is attached.

  On the other hand, the refrigerator compartment evaporator 6 is provided with a refrigerator compartment defrost heater 47 for melting and defrosting the frost on the refrigerator compartment evaporator 6, and further, a predetermined frost of the refrigerator compartment evaporator 6. A refrigerating room defrosting temperature sensor 42 for detecting the recovery temperature (for example, + 10 ° C.) is attached. Further, on the back (lower) surface of the drain pan 20 located on the lower side of the refrigerating room evaporator 6, the refrigerating room drain pan functioning as a freezing and melting heater that melts or contributes to the freezing of the drain pan 20 and the refrigerating room blower 7R. The fan case 55 to which the heater 51 is attached and the refrigerator compartment fan 7R is attached to the refrigerator compartment fan case heater that also functions as an ice melting and melting heater that melts or contributes to the melting of the refrigerator compartment fan 7R. 52 is attached.

  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 cooled. It is assumed that the refrigerant flows out of the temperature range and the refrigerant 5 or 6 that has deviated is stopped from flowing (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 temperature sensor (freezer temperature detection means; storage room temperature sensor) 29 for detecting the temperature of the room 3 and a refrigerating room temperature sensor (refrigeration room temperature detection means. Storage room temperature sensor) for detecting the temperature of the refrigerating room 4. 30 and an outside air temperature sensor (outside air temperature detecting means) 32 for detecting the outside air temperature are 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. 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.

(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.

  Further, when each blower 7F, 7R is 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) Priority cooling mode (refrigeration room priority cooling mode, freezer compartment priority cooling mode)
Here, the heat-insulating doors 8 and 9 are opened for a long time to put food in and out of the freezer compartment 3 and the refrigerator compartment 4 of the cold storage 1 or are opened and closed frequently, or are completely closed despite being closed. In the case of the heat insulating door 8, when the heat insulating door 8 is left untreated for a long period of time, a large amount of outside air enters the freezer compartment 3 in the case of the heat insulating door 8 and the refrigerator compartment 4 in the case of the heat insulating door 9. And those temperatures will rise abnormally.

  In such a case, the control device 40 executes the priority cooling mode (refrigeration room priority cooling mode and freezer compartment priority cooling mode) of each room. The flowchart of FIG. 7 shows the priority cooling mode, and the control device 40 executes this flowchart during the normal cooling operation.

  Further, the control device 40 has a freezer compartment high temperature threshold value FSH of the freezer compartment 3 and a refrigerating room high temperature threshold value RSH of the refrigerator compartment 4. The freezer compartment high temperature threshold FSH is a predetermined value higher than the freezer compartment cooling temperature range (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.)). For example, the set temperature TF + 5 ° C. is set, and the refrigerating room high temperature threshold RSH is the refrigerating room cooling temperature range (the refrigerating room lower limit temperature TRL (set temperature TR-2 ° C.) or more, the refrigerating room upper limit temperature TRH (set temperature TR + 2 ° C.) A predetermined value higher than the following temperature range), for example, a set temperature TR + 6 ° C.

  And the control apparatus 40 is monitoring whether the temperature of the freezer compartment 3 which the freezer compartment temperature sensor 29 detects by step S14 of FIG. 7 is below the said freezer compartment high temperature threshold value FSH (setting temperature TF + 5 degreeC). If this is the case, the process proceeds to step S15, and this time, the state in which the temperature of the refrigerator compartment 4 detected by the refrigerator compartment temperature sensor 30 rises above the refrigerator compartment high temperature threshold RSH continues for a predetermined time, for example, five minutes or more. It is determined whether or not (integrated by the timer 27). Here, for example, when the temperature of the refrigerating room 4 rises abnormally because the heat insulating door 9 of the refrigerating room 4 is opened for a long time and the temperature exceeds the refrigerating room high temperature threshold RSH, the control device 40 proceeds from step S15 to step S16, the three-way valve 17 is switched to a state in which the refrigerant is supplied only to the refrigerator compartment evaporator 6, and the operating frequency of the compressor 13 is increased to the upper limit value (G2). Refrigerator priority cooling mode that continues to operate at the value is executed.

  As a result, the refrigerant is not supplied to the freezer evaporator 5, but is supplied only to the refrigerator compartment evaporator 6, and the capacity of the compressor 13 is maximized, so that the refrigerator compartment 4 is strongly cooled. In addition, the temperature of the refrigerator compartment 4 starts to decrease rapidly. Then, the control device 40 proceeds to step S17 to determine whether or not the temperature of the refrigerator compartment 4 has decreased to the refrigerator compartment lower limit temperature TRL (thermo-off). If not, the controller 40 proceeds to step S18. It is determined whether the temperature has risen above the freezer compartment high temperature threshold FSH and a predetermined time, for example, 1 minute has elapsed (integrated by the timer 27). If not, the process returns to step S17 to continue the refrigerator compartment priority cooling mode. To do.

  While the refrigerator compartment priority cooling mode is being executed, for example, when the temperature of the refrigerator compartment 4 falls below the refrigerator compartment lower limit temperature TRL (thermo-off), the control device 40 returns to the start from step S17, and the refrigerator compartment End the preferential cooling mode. Not only the lower limit temperature TRL but also any value in the cooling room cooling temperature range such as approaching the set temperature TR, and the temperature of the refrigerator room 4 is lowered to that temperature, the refrigerator compartment priority cooling mode is set. You may end.

  Thus, when the temperature of the refrigerator compartment 4 has risen above the refrigerator compartment high temperature threshold value RSH for 5 minutes or more, the refrigerator compartment priority to supply only to the refrigerator compartment evaporator 6 by stopping the refrigerant supply to the freezer compartment evaporator 5 is given. Since the cooling mode is executed, the temperature of the refrigerator compartment 4 can be quickly lowered, and deterioration of the stored articles can be avoided in advance.

  In this case, the refrigerator compartment priority cooling mode is executed only when the temperature of the freezer compartment 3 is equal to or lower than the freezer compartment high temperature threshold FSH in step S14, and thus is not executed when the temperature of the freezer compartment 3 is high. Therefore, it is possible to prevent an abnormal temperature rise in the freezer compartment 3.

  During execution of the refrigerator compartment priority cooling mode, the temperature of the freezer compartment 3 rises more than expected, and in step S18, the temperature of the freezer compartment 3 becomes equal to or higher than the freezer compartment high temperature threshold FSH, and one minute has elapsed. When it has done, the control apparatus 40 returns to a start from step S18, and complete | finishes the refrigerator compartment priority cooling mode (The timer 27 is not reset).

  In this way, the control device 40 continues for one minute or longer when the temperature of the refrigerator compartment 4 decreases to, for example, the refrigerator compartment lower limit temperature TRL, or when the temperature of the refrigerator compartment 3 rises above the freezer compartment high temperature threshold FSH. In this case, since the refrigerator compartment priority cooling mode is terminated, it is possible to avoid the inconvenience that the temperature of the freezer compartment 3 rises abnormally while the refrigerator compartment priority cooling mode is being executed.

  On the other hand, when the temperature of the freezer compartment 3 is higher than the freezer compartment high temperature threshold value FSH in step S14, the control device 40 proceeds from step S14 to step S19, and this time the temperature of the freezer compartment 3 rises above the freezer compartment high temperature threshold value FSH. It is determined whether or not the state has been kept for a predetermined time, for example, 3 minutes or more (integrated by the timer 27). Here, for example, when the temperature of the freezer compartment 3 abnormally rises due to, for example, the heat insulating door 8 of the freezer compartment 3 being opened for a long time and the temperature exceeds the freezer compartment high temperature threshold FSH, the control device The process proceeds from step S19 to step S20, and it is determined whether or not the temperature of the refrigerator compartment 4 is equal to or lower than the refrigerator compartment high temperature threshold value RSH.

  And if the temperature of the refrigerator compartment 4 is below the refrigerator compartment high temperature threshold value RSH, the control apparatus 40 will progress to step S21 from step S20, will switch the three-way valve 17 to the state in which a refrigerant | coolant is supplied only to the freezer compartment evaporator 5, Furthermore, the operating frequency of the compressor 13 is raised to the upper limit value (G2), and the freezer compartment priority cooling mode in which the operation is continued at the upper limit value is executed.

  As a result, the refrigerant is not supplied to the refrigerator compartment evaporator 6, but is supplied only to the freezer compartment evaporator 5, and the capacity of the compressor 13 is maximized, so that the refrigerator compartment 3 is strongly cooled. Then, the temperature of the freezer compartment 3 is rapidly lowered. Then, the control device 40 proceeds to step S22, determines whether or not the temperature of the freezer compartment 3 has decreased to the freezer compartment lower limit temperature TFL (thermo-off), and if not, proceeds to step S23, and this time the refrigerator compartment 4 It is determined whether the temperature has risen above the refrigerator compartment high temperature threshold RSH and a predetermined time, for example, 1 minute has elapsed (integrated by the timer 27). If not, the process returns to step S22 to continue the freezer compartment priority cooling mode. To do.

  While the freezer compartment priority cooling mode is being executed, for example, when the temperature of the freezer compartment 3 falls below the freezer compartment lower limit temperature TFL (thermo-off), the control device 40 returns to the start from step S22, and the freezer compartment End the preferential cooling mode. Not only the lower limit temperature TFL but also any value in the freezer compartment cooling temperature range, such as approaching the set temperature TF, and the temperature of the freezer compartment 3 is lowered to that temperature, so that the freezer compartment preferential cooling mode is set. You may end.

  Thus, when the temperature of the freezer compartment 3 has risen to the freezer compartment high temperature threshold FSH or more for 3 minutes or more, the refrigerant supply to the freezer compartment evaporator 6 is stopped and supplied to the freezer compartment evaporator 5 only. Since the cooling mode is executed, the temperature of the freezer compartment 3 can be quickly reduced, and deterioration such as melting of the stored frozen articles can be avoided in advance.

  In this case, the freezer compartment priority cooling mode is executed only when the temperature of the refrigerator compartment 4 is equal to or lower than the refrigerator compartment high temperature threshold value RSH in step S20, and thus is not executed when the temperature of the refrigerator compartment 4 is high. Therefore, it is possible to prevent an abnormal temperature rise in the refrigerator compartment 4.

  During execution of the freezer compartment priority cooling mode, the temperature of the refrigerator compartment 4 rises more than expected, and in step S23, the temperature of the refrigerator compartment 4 becomes equal to or higher than the refrigerator compartment high temperature threshold RSH, and one minute has elapsed. When it has done, the control apparatus 40 returns to a start from step S23, and complete | finishes freezer compartment priority cooling mode (The timer 27 is not reset).

  In this way, the control device 40 continues for one minute or longer when the temperature of the freezer compartment 3 decreases to, for example, the freezer compartment lower limit temperature TFL, or when the temperature of the refrigerator compartment 4 rises to the refrigerator compartment high temperature threshold RSH or more. In this case, since the freezer compartment priority cooling mode is terminated, it is possible to avoid the inconvenience that the temperature of the refrigerator compartment 4 rises abnormally while the freezer compartment priority cooling mode is being executed.

  In addition, the control apparatus 40 does not perform the said priority cooling mode at the time of the pull-down after installation of the cooling storage 1, or the fixed time after the defrosting operation of both the evaporators 5 and 6. FIG. This is because the temperature of both chambers 3 and 4 is originally high, and it is necessary to cool both.

(3) Single-Cooling Elimination Control Here, when the capillary tubes 18 and 19 are used as decompression means and the refrigerant is distributed to the evaporators 5 and 6 by the three-way valve 17, the refrigerant is supplied to both the evaporators 5 and 6. When the refrigerant is supplied, there may be a situation in which the refrigerant continues to be supplied to only one side. For example, the freezer compartment 3 is cooled to the freezer compartment cooling temperature range, but when the temperature of the freezer compartment 3 has not decreased to the freezer compartment lower limit temperature TFL, the refrigerant continues to be supplied to the freezer compartment evaporator 5. Under such circumstances, for example, even if the temperature of the refrigerating chamber 4 rises due to frequent opening of the heat insulating door 9 or the like, the amount of refrigerant supplied to the refrigerating chamber evaporator 6 because the refrigerant also flows into the freezer compartment evaporator 5. Decreases by that amount. On the other hand, the amount of refrigerant supplied to the freezer compartment evaporator 5 is not sufficient to lower the freezer compartment lower limit temperature TFL, so that the temperature of the refrigerator compartment 4 deviates above the refrigerator compartment cooling temperature range and gradually increases. The so-called chilling state in which the state of rising continuously continues for a long time. The same applies to the reverse case (the temperature of the freezer compartment 3 gradually increases since the refrigerator compartment 4 is cold).

  In such a case, the control device 40 executes the single cooling cancel control. The flowchart of FIG. 8 shows the single cooling cancel control, and the control device 40 executes this flowchart during the normal cooling operation. That is, the controller 40 detects that the temperature of the freezer compartment 3 detected by the freezer temperature sensor 29 in step S24 of FIG. 8 is within the freezer compartment cooling temperature range (a temperature range between the freezer compartment lower limit temperature TFL and the freezer compartment upper limit temperature TFH). Determine whether or not. If it is within, the control device 40 proceeds to step S28, the temperature of the refrigerator compartment 4 detected by the refrigerator compartment temperature sensor 30 deviates above the refrigerator compartment upper limit temperature TRH, and the state becomes high for a predetermined time, For example, it is determined whether or not it has continued for 15 minutes or longer (integrated by the timer 27).

  And the state where the temperature of the freezer compartment 3 has deviated above the refrigerator compartment cooling temperature range although the temperature of the freezer compartment 3 is cooled to the freezer compartment cooling temperature range even if the freezer compartment 3 is in a single-cooled state. When the predetermined time (15 minutes) continues, the control device 40 proceeds from step S28 to step S29, and switches the three-way valve 17 to a state in which the refrigerant is supplied only to the refrigerator compartment evaporator 6. Thereafter, the normal cooling operation is performed.

  Thus, for example, even when the three-way valve 17 is supplying refrigerant to both the evaporators 5 and 6, when the freezer compartment 3 is in a single-cooled state, the temperature of the freezer compartment 3 becomes the freezer compartment lower limit temperature. Even if the temperature does not drop to TFL, the supply of the refrigerant to the freezer compartment evaporator 5 is forcibly stopped and the state is switched to the state where only the refrigerator compartment evaporator 6 is supplied. Therefore, the refrigerant is supplied only to the refrigerator compartment evaporator 6. Thus, the temperature of the refrigerator compartment 4 can be quickly lowered, and the one-sided cooling state in which the refrigerator compartment 3 is cooled but the refrigerator compartment 4 is not cooled can be quickly eliminated.

  On the other hand, if the temperature of the freezer compartment 3 is not within the freezer compartment cooling temperature range in step S24 of FIG. 8, the control device 40 proceeds from step S24 to step S25, and the temperature of the refrigerator compartment 4 falls within the refrigerator compartment cooling temperature range (refrigerator compartment temperature). It is determined whether the temperature is within the room lower limit temperature TRL or more and the refrigerator compartment upper limit temperature TRH or less. If it is within the range, the control device 40 proceeds to step S26, where the temperature of the freezer compartment 3 deviates above the freezer compartment upper limit temperature TFH and becomes high, and the state continues for a predetermined time, for example, 15 minutes or more. Judgment is made (accumulation by the timer 27).

  And the state in which the temperature of the freezer compartment 3 has deviated from the freezer compartment cooling temperature range although the temperature of the refrigerator compartment 4 is cooled to the refrigerator compartment cooling temperature range even if the refrigerator compartment 4 is in a single-cooled state. If the predetermined time (15 minutes) continues, the control device 40 proceeds from step S26 to step S27, and switches the three-way valve 17 to a state in which the refrigerant is supplied only to the freezer compartment evaporator 5. Thereafter, the normal cooling operation is performed.

  Thereby, for example, even when the three-way valve 17 is supplying refrigerant to both the evaporators 5 and 6, the temperature of the refrigerator compartment 4 is reduced to the lower limit temperature of the refrigerator compartment 4 when the refrigerator compartment 4 is in a chilled state. Even if it does not drop to TRL, the supply of refrigerant to the refrigerator compartment evaporator 6 is forcibly stopped and switched to a state where only the refrigerator compartment evaporator 5 is supplied, so that the refrigerant is supplied only to the refrigerator compartment evaporator 5. Thus, the temperature of the freezer compartment 3 can be quickly lowered, and the one-sided cooling state in which the refrigerator compartment 4 is cooled but the freezer compartment 3 is not cooled can be quickly eliminated.

(4) Duty control Here, for example, when both the freezer compartment 3 and the refrigerator compartment 4 are overloaded and the temperature of any of the compartments has risen abnormally, the control device 40 has both evaporators. Duty control for alternately supplying refrigerant to 5 and 6 is executed. The flowchart of FIG. 9 shows duty control, and the control device 40 executes this flowchart during the normal cooling operation. That is, the control device 40 determines whether or not the state in which the temperature of the refrigerator compartment 4 is equal to or higher than the refrigerator compartment high temperature threshold value RSH in step S30 in FIG. Total). If it continues, the process proceeds to step S31, and it is determined whether or not the state where the temperature of the freezer compartment 3 is equal to or higher than the freezer compartment high temperature threshold FSH continues for a predetermined time, for example, 15 minutes (timer). 27).

  If any of the chambers 4 and 3 continues for a predetermined time or longer and is equal to or higher than the high temperature thresholds RSH and FSH, the control device 40 proceeds from step S31 to step S32 and executes duty control. With this duty control, the control device 40 repeatedly supplies the refrigerant only to the freezer compartment evaporator 5 for 7 minutes, for example, and then supplies the refrigerant only to the refrigerator compartment evaporator 6 for 5 minutes, for example. That is, the refrigerant is alternately supplied to both evaporators 5 and 6. The reason why the refrigerant is supplied to the freezer compartment evaporator 5 longer than the refrigerator compartment evaporator 6 is that the temperature of the freezer compartment 3 is more likely to rise than the temperature of the refrigerator compartment 4.

  As described above, when both the refrigerator compartment 4 and the freezer compartment 3 continue to rise abnormally in temperature, the refrigerant is alternately supplied to the evaporators 5 and 6 to concentrate both chambers 4 and 5 alternately. As a result, the temperature of both chambers 4 and 5 can be quickly lowered.

  Note that the control device 40 determines whether or not the temperature of the freezer compartment 3 or the refrigerator compartment 4 has fallen to the respective cooling temperature ranges in step S33. Proceeding to S34, the duty control is canceled and the normal cooling operation is resumed. As a result, when the temperature rise in any of the chambers 3 and 4 is resolved, the normal cooling state can be restored without any trouble.

DESCRIPTION OF SYMBOLS 1 Cooling storage 2 Heat insulation box 3 Freezer room 4 Refrigerating room 5 Freezer room evaporator 6 Cold room evaporator 8, 9 Heat insulation door 13 Compressor 14 Condenser 16 Cooling device 17 Three-way valve (control means)
18, 19 Capillary tube (pressure reduction means)
29 Freezer temperature sensor (freezer temperature detection means)
30 Cold room temperature sensor (refrigeration room temperature detection means)
32 Outside temperature sensor 40 Control device (control means)

Claims (10)

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 cooling storage room which cools each room by distributing and supplying,
A freezer temperature sensor and a refrigerating room temperature sensor for detecting temperatures of the freezing room and the refrigerating room, respectively;
Based on the temperature of the freezer compartment and the refrigerator compartment detected by each temperature sensor, the temperature of each compartment is supplied to each evaporator so as to fall within a predetermined cooling temperature range including a set temperature set for each compartment. A refrigerant supply and control means for controlling the operation of the compressor,
The control means has a predetermined freezer compartment high temperature threshold and a refrigerator compartment high temperature threshold higher than the cooling temperature range of each of the chambers,
When the state in which the temperature of the refrigerating room is rising above the refrigerating room high temperature threshold continues for a predetermined time and the temperature of the freezing room is equal to or lower than the freezing room high temperature threshold, the freezer room evaporator A refrigeration store preferential cooling mode for preferentially supplying a refrigerant to the refrigeration chamber evaporator is performed.   When the temperature of the refrigerating room has dropped to any value in the cooling temperature range, or the state where the temperature of the freezer room has risen above the freezer room high temperature threshold has continued for a predetermined time. The cooling storage according to claim 1, wherein the cooling room priority cooling mode is terminated.   When the temperature of the freezer compartment has risen above the freezer compartment high temperature threshold has continued for a predetermined time and the temperature of the refrigerator compartment is below the refrigerator compartment high temperature threshold, The cooling storage according to claim 1 or 2, wherein a freezer compartment priority cooling mode for supplying a refrigerant to the freezer compartment evaporator in preference to a refrigerator compartment evaporator is executed. 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 cooling storage room which cools each room by distributing and supplying,
A freezer temperature sensor and a refrigerating room temperature sensor for detecting temperatures of the freezing room and the refrigerating room, respectively;
Based on the temperature of the freezer compartment and the refrigerator compartment detected by each temperature sensor, the temperature of each compartment is supplied to each evaporator so as to fall within a predetermined cooling temperature range including a set temperature set for each compartment. A refrigerant supply and control means for controlling the operation of the compressor,
The control means has a predetermined freezer compartment high temperature threshold and a refrigerator compartment high temperature threshold higher than the cooling temperature range of each of the chambers,
When the state where the temperature of the freezer compartment is rising above the freezer compartment high temperature threshold continues for a predetermined time and the temperature of the refrigerator compartment is below the refrigerator compartment high temperature threshold value, the refrigerator compartment evaporator A freezer compartment preferential cooling mode for supplying refrigerant to the freezer evaporator preferentially is executed.   When the temperature of the freezer compartment decreases to any value in the cooling temperature range, or the temperature of the refrigerator compartment has risen above the high temperature threshold value of the refrigerator compartment has continued for a predetermined time. In this case, the cooling storage according to claim 3 or 4, wherein the freezer compartment preferential cooling mode is terminated.   When the temperature of the freezer compartment is in the cooling temperature range and the temperature of the refrigerator compartment deviates from the cooling temperature range continues for a predetermined time, the control means 6. The cooling storage according to claim 1, wherein the refrigerant is switched to a state in which a refrigerant is supplied to the refrigerator compartment evaporator without supplying the refrigerant.   When the temperature of the refrigerator compartment is in the cooling temperature range and the temperature of the freezer compartment deviates from the cooling temperature range continues for a predetermined time, the control means The cooling storage according to any one of claims 1 to 6, wherein the refrigerant is switched to a state in which refrigerant is supplied to the freezer compartment evaporator without supplying refrigerant.   When the temperature of the refrigerating room and the freezing room has risen above the refrigerating room high temperature threshold value and the freezing room high temperature threshold value for a predetermined time, the control means alternately supplies refrigerant to both evaporators with a predetermined duty. The cooling storage according to any one of claims 1 to 7, wherein a duty control mode for supplying the power is executed.   The cooling storage according to claim 8, wherein the control means ends the duty control mode when the temperature of the refrigerator compartment or the freezer compartment falls to any value of the cooling temperature range.   A three-way valve controlled by the control means and capable of selectively supplying refrigerant to only one of the evaporators and supplying refrigerant to both evaporators simultaneously; Each said pressure reduction means is comprised by the capillary tube, The cooling storage in any one of the Claims 1 thru | or 9 characterized by the above-mentioned.

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