JP4528755B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator including two evaporators, a refrigerator for a refrigerator compartment and an evaporator for a freezer compartment.

  In recent years, for example, home refrigerators have been provided with two evaporators, one for a refrigerator compartment and one for a freezer compartment. In a refrigeration cycle incorporated in a refrigerator of this type, a refrigerant flow path having a first capillary tube and an evaporator for a refrigerator compartment and a refrigerant flow path having a second capillary tube and an evaporator for a freezer compartment are connected in parallel. In addition, a switching valve for switching the refrigerant flow paths is provided.

  Then, by switching and controlling the switching valve, the refrigerant from the condenser flows through the first capillary tube to the refrigerator for the refrigerator and returns to the compressor, and the refrigerant from the condenser is secondly supplied. A freezer compartment cooling mode that flows through the capillary tube to the freezer evaporator and returns to the compressor is alternately switched. Thereby, the refrigerator compartment and the freezer compartment are cooled alternately. In the refrigerator compartment cooling mode, the refrigerator compartment fan is driven, and in the refrigerator compartment cooling mode, the refrigerator fan is driven.

  By the way, in this type of refrigerator, in order to efficiently cool both the refrigerator compartment and the freezer compartment, it is possible to control the amount of refrigerant flowing through the refrigerator for the refrigerator compartment and the evaporator for the freezer compartment to be appropriate. Necessary. In normal cases, the temperature of the freezer evaporator is sufficiently lower than that of the freezer compartment evaporator, so that the refrigerant tends to stay on the low temperature freezer evaporator side. When switching to the room cooling mode, there is a situation in which the amount of refrigerant flowing in the refrigerator for the refrigerator compartment is insufficient at the beginning of the switching. In this case, the amount of refrigerant flowing through the refrigerator for the refrigerator compartment gradually approaches an appropriate value with the passage of time, but a shortage of the refrigerant amount at the initial stage of the refrigerator compartment cooling mode causes a decrease in cooling efficiency.

Therefore, in this kind of refrigerator, before shifting from the freezer cooling mode to the refrigerating room cooling mode, the pump down mode for driving the compressor in a state where both the refrigerant flow paths are shut off by fully closing the switching valve, It is considered to execute for a certain period of time (see, for example, Patent Document 1 and Patent Document 2). By executing this pump-down mode, the refrigerant staying in the freezer compartment evaporator can be recovered, and at the start of the next refrigerating room cooling mode, a sufficient amount of refrigerant can flow through the refrigerating room evaporator. . It is also considered that a simultaneous cooling operation in which the switching valve is fully opened and the refrigerant flows into both refrigerant channels is performed for a certain period of time before entering the refrigerating room cooling mode.
JP 2003-214745 A JP 2002-277083 A

  However, for example, immediately after the load is applied to the freezer compartment, when the temperature of the freezer compartment increases due to frequent opening and closing of the freezer compartment door, or when the refrigerator door is opened, the refrigerator compartment fan stops and the refrigerator compartment compartment is opened. There are cases where a sufficient temperature difference between the freezer evaporator and the refrigerator refrigerator cannot be maintained, such as when the temperature of the evaporator is lowered. In such a situation, if the above-described pump down mode or simultaneous cooling operation is executed, there is a risk that more refrigerant than necessary will flow through the refrigerator for the refrigerator compartment. If the amount of refrigerant flowing through the refrigerator for the refrigerator compartment becomes excessive, a so-called liquid back phenomenon occurs in which part of the refrigerant in the evaporator for the refrigerator compartment returns to the compressor without being vaporized, resulting in a significant reduction in cooling efficiency. There is a problem that wasteful power is consumed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide two evaporators for the refrigerator compartment and for the freezer compartment, and alternately execute the refrigerator compartment cooling mode and the freezer compartment cooling mode. Accordingly, it is an object of the present invention to provide a refrigerator capable of appropriately controlling the amount of refrigerant flowing through the refrigerator for the refrigerator compartment and efficiently cooling the refrigerator compartment and the freezer compartment.

  In a refrigerator provided with two evaporators, one for the refrigerator compartment and one for the freezer compartment, and alternately executing the refrigerator compartment cooling mode and the refrigerator compartment cooling mode, the evaporator for the freezer compartment and the refrigerator compartment In normal times when there is a sufficient temperature difference between the evaporator and the evaporator, a pump-down mode in which the compressor is driven in a fully-closed mode in which the refrigerant flow path is shut off and / or refrigeration is performed before shifting to the refrigerator cooling mode. By executing the simultaneous cooling mode in which the refrigerant flows through both the room evaporator and the freezer evaporator, the shortage of the refrigerant with respect to the refrigerator for the refrigerator compartment can be solved.

  On the other hand, when the pump-down mode and / or the simultaneous cooling mode is executed in the same manner as in a normal state with a relatively small temperature difference between the freezer evaporator and the refrigerator refrigerator, This causes a problem that the refrigerant flowing into the refrigerator for the refrigerating chamber becomes excessive when the shift is made. The present inventors pay attention to such problems, and directly determine whether or not the temperature difference between the freezer evaporator and the refrigerator freezer is small when shifting to the refrigerator cooling mode. In this situation, it is possible to reduce the amount of refrigerant flowing into the refrigerator for the refrigerator compartment by reducing the execution of the simultaneous cooling mode and / or the pump down mode. It was solved.

  In other words, the first refrigerator according to the present invention performs switching to control the refrigerant flow switching means so as to shift to the refrigerator compartment cooling mode after executing the pump down mode before executing the refrigerator compartment cooling mode. And a control means for determining whether or not the temperature of the freezer compartment is higher than a set temperature, and for providing the switching control means for determining whether the temperature of the freezer compartment is higher than the set temperature. It is characterized in that when it is determined that the time is high, the execution time of the pump-down mode is shortened from the normal time, or the mode is shifted to the refrigerating room cooling mode without executing the pump-down mode. 1 invention).

  The second refrigerator of the present invention performs switching control means for controlling the refrigerant flow switching means so as to shift to the refrigerator compartment cooling mode after executing the simultaneous cooling mode before executing the refrigerator compartment cooling mode. Provided with a judging means for judging whether or not the temperature of the freezer compartment is higher than a set temperature, and when the temperature of the freezer compartment is higher than the set temperature by the judging means. When judged, the execution time of the simultaneous cooling mode is shortened from the normal time, or the system is configured to shift to the refrigerating room cooling mode without executing the simultaneous cooling mode. invention).

  According to these, when it is determined by the determination means that the temperature of the freezer compartment is higher than the set temperature, the temperature difference between the freezer compartment evaporator and the refrigerator compartment evaporator is relatively small. Therefore, at that time, by reducing the execution of the pump down mode (reducing the execution time or omitting the execution) or reducing the execution of the simultaneous cooling mode (reducing the execution time or omitting the execution), the refrigerator compartment The amount of refrigerant flowing in the evaporator can be reduced. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  In the third refrigerator of the present invention, before executing the refrigerating room cooling mode, the simultaneous cooling mode and the pump down mode are sequentially executed before the refrigerant flow path switching means so as to shift to the refrigerating room cooling mode. And a switching control means for controlling, a judgment means for judging whether or not the temperature of the freezer compartment is higher than a set temperature, and the judgment means has judged that the temperature of the freezer compartment is higher than the preset temperature. In some cases, the present invention is characterized in that compressor control means is provided which executes the compressor at a lower speed than usual in the simultaneous cooling mode and / or the pump down mode (invention of claim 3).

  According to this, when it is determined by the determination means that the temperature of the freezer compartment is higher than the set temperature, the temperature difference between the freezer evaporator and the refrigerator refrigerator is relatively small. Therefore, at that time, the simultaneous cooling mode and / or the pump down mode are executed with the rotation speed of the compressor lower than usual, so that the amount of refrigerant flowing through the refrigerator for the refrigerator compartment can be reduced. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  In the present invention, the determination means described above is performed by using the freezer temperature sensor for detecting the temperature in the freezer room, the refrigerating room defrost sensor for detecting the temperature of the freezer room evaporator part, or the temperature of the freezer room evaporator part. Based on the detection of the freezer compartment defrost sensor that detects the temperature, it can be configured to determine whether the temperature of the freezer compartment is higher than the set temperature (invention of claim 4). Thereby, it becomes possible to judge the cooling state of a freezer compartment and a refrigerator compartment, and the temperature state of each evaporator with higher precision.

  In the fourth refrigerator of the present invention, before executing the refrigerator compartment cooling mode, the simultaneous cooling mode and the pump down mode are executed in order before the refrigerant flow path switching means so as to shift to the refrigerator compartment cooling mode. When the refrigerator compartment door is opened and the refrigerator compartment fan is stopped when the refrigerator compartment control unit is controlled, the simultaneous cooling mode and until the prescribed time elapses or until the refrigerator compartment cooling mode is executed a prescribed number of times. / Or shorten the execution time of the pump down mode than normal, or shift to the refrigerator compartment cooling mode without executing the simultaneous cooling mode and / or pump down mode, or the simultaneous cooling mode and / or pump down The present invention is characterized in that a control means is provided that executes the compressor at a lower speed than usual in the mode (invention of claim 5).

  According to this, when the door of the refrigerator compartment is opened and the fan for the refrigerator compartment is stopped, the low temperature of the evaporator for the refrigerator compartment is maintained and the temperature difference between the evaporator for the freezer compartment and the evaporator for the refrigerator compartment is maintained. Therefore, in this case, the simultaneous cooling mode and / or the pump-down mode can be reduced to reduce the amount of refrigerant flowing to the refrigerating room evaporator. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  In the fifth refrigerator of the present invention, before executing the refrigerating room cooling mode, the simultaneous cooling mode and the pump down mode are sequentially executed before the refrigerant flow path switching means so as to shift to the refrigerating room cooling mode. And a switching control means for controlling, when the load on the compressor during the execution of the cold room cooling mode is increasing, the simultaneous cooling mode and / or the pump until the cold room cooling mode is executed a predetermined number of times. Shorten the execution time of the down mode from the normal time, or shift to the refrigerator cooling mode without executing the simultaneous cooling mode and / or the pump down mode, or in the simultaneous cooling mode and / or the pump down mode The present invention is characterized in that a control means for executing the compressor at a lower rotational speed than usual is provided (invention of claim 6).

  According to this, when a so-called liquid back phenomenon occurs due to an excessive amount of refrigerant flowing in the refrigerator compartment evaporator, the load on the compressor tends to increase during execution of the refrigerator compartment cooling mode. In addition, by reducing the execution of the simultaneous cooling mode and / or the pump down mode, it is possible to reduce the amount of refrigerant flowing to the refrigerator for the refrigerator compartment. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  By the way, after turning on the power at the beginning of use at the time of installing the refrigerator or after recovering from a power failure, and further after the defrosting operation for the evaporator (freezer for evaporator), the evaporator for freezer and the evaporator for refrigerator There is a risk that a sufficient amount of refrigerant may flow to the evaporator for the refrigerator compartment because a sufficient temperature difference between the refrigerant and the refrigerant is not maintained. In this case, particularly at the start of use in summer, the amount of load applied to the compressor increases, which may cause a temperature rise of the control board.

  Therefore, the sixth refrigerator of the present invention executes the simultaneous cooling mode and the pump down mode in order before executing the refrigerating room cooling mode, and then switches the refrigerant flow path so as to shift to the refrigerating room cooling mode. And a switching control means for controlling the means until the refrigerator compartment cooling mode is executed a predetermined number of times after the power is turned on and / or after the defrosting operation is completed, or until the temperature of the freezer compartment is equal to or lower than a set temperature. Or, it is characterized in that there is provided control means for shifting to the cold room cooling mode without executing the simultaneous cooling mode and / or the pump down mode until the execution time of the cold room cooling mode has passed for a predetermined time. (Invention of Claim 7).

  According to this, after the power is turned on and / or after the defrosting operation is completed, the temperature of the freezer compartment (freezer compartment evaporator) is relatively high, and the temperature between the freezer compartment evaporator and the refrigerator compartment evaporator is relatively high. Since the temperature difference is relatively small, in that case, the simultaneous cooling mode and / or the pump-down mode can be omitted, and the amount of refrigerant flowing through the refrigerating room evaporator can be reduced. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  Also, during normal operation, there is a situation in which heat exchange of the refrigerant in the freezer evaporator is not performed during execution of the refrigerator cooling mode. At this time, the surface temperature of the freezer evaporator is sufficient. Since the refrigeration blower fan is driven, cold air can be supplied to the frozen stock or ice tray to contribute to constant cooling. However, the driving of the refrigeration blower fan during the execution of the refrigerator compartment cooling mode causes the temperature of the freezer compartment evaporator to rise.

  The seventh refrigerator of the present invention performs the cooling chamber cooling mode by sequentially executing the simultaneous cooling mode and the pump down mode before executing the refrigerator compartment cooling mode, and then changing the refrigerant flow path switching means to shift to the refrigerator compartment cooling mode. And a refrigeration blower fan control means for controlling the refrigeration blower fan to be driven even during execution of the refrigerator compartment cooling mode. After the power is turned on and / or after the defrosting operation is completed, until the refrigerator compartment cooling mode is executed a predetermined number of times, the temperature of the freezer compartment is equal to or lower than the set temperature, or the execution time of the refrigerator compartment cooling mode is a predetermined time. A feature is that the operation of the refrigeration blower fan is stopped during the execution of the refrigerating room cooling mode until the time has elapsed (invention of claim 8).

  According to this, after the power is turned on and / or after the defrosting operation is completed, the temperature of the freezer compartment (freezer compartment evaporator) is relatively high, and the temperature between the freezer compartment evaporator and the refrigerator compartment evaporator is relatively high. Since the temperature difference is relatively small, in this case, the operation of the freezing fan is stopped by the freezing air fan control means by stopping the operation of the freezing air fan during execution of the refrigerating room cooling mode. A temperature rise can be suppressed and it can suppress that more refrigerant | coolants flow than required amount to the evaporator for refrigerator compartments. Thereby, it is possible to appropriately control the amount of refrigerant flowing to the evaporator for the refrigerator compartment, to increase the cooling efficiency, to suppress the so-called liquid back phenomenon and to prevent wasteful power consumption, Reliability can be increased.

  According to the refrigerator of the present invention, two evaporators for the refrigerator compartment and for the freezer compartment are provided, and the refrigerator compartment cooling mode and the freezer compartment cooling mode are alternately executed. When there is a possibility that the amount of refrigerant flowing to the evaporator will be excessive, the execution of the simultaneous cooling mode and / or the pump down mode is reduced to reduce the amount of refrigerant flowing, so that it flows to the evaporator for the refrigerator compartment It is possible to appropriately control the amount of the refrigerant, and as a result, it is possible to perform efficient cooling of the refrigerator compartment and the freezer compartment.

(1) First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 has shown the structure of the main body 1 of the refrigerator which concerns on a present Example. The refrigerator body 1 is provided with a refrigerator compartment 3, an ice making compartment 4, a vegetable compartment 5, and a freezer compartment 6 in order from the top by partitioning the inside of the heat insulation box 2 up and down by heat insulation partition walls 2a, 2b, 2c. ing. Although not shown, the ice making chamber 4 is provided side by side with the switching chamber.

  A hinged door 7 is provided at the front of the refrigerator compartment 3, and drawer-type doors 8, 9, 10 are provided at the front of the ice making chamber 4, the vegetable compartment 5, and the freezer compartment 6, respectively. ing. An ice storage container 11 is connected to the back surface of the door 8, and storage containers 12 and 13 are connected to the back surfaces of the doors 9 and 10, respectively. A refrigerating room temperature sensor 14 for detecting the temperature in the refrigerating room 3 is provided in the refrigerating room 3, and in the freezing room 6, the temperature in the freezing room 6 is detected. The freezer temperature sensor 15 is provided.

  On the back wall of the vegetable compartment 5, an evaporator room 16 for a refrigeration room and an evaporator room 17 for a freezer compartment are provided so as to overlap in two stages. In the refrigerator compartment evaporator 16, a refrigerator compartment evaporator 18 and a refrigerator fan 19 for cooling the refrigerator compartment 3 and the vegetable compartment 5 are provided. The freezer compartment evaporator 17 is provided with a freezer compartment evaporator 20 and a freezing blower fan 21 for cooling the freezer compartment 6 and the ice making chamber 4. Although not shown in detail, the refrigerating room evaporator 18 and the refrigerating fan 19 and the freezer room evaporator 20 and the refrigerating fan 21 are provided at positions shifted left and right. A defrosting heater (not shown) is provided below the evaporator 20.

  Thus, when the refrigeration blower fan 19 is driven, the cold air generated by the refrigeration room evaporator 18 passes from the upper part of the refrigeration room evaporator room 16 through the air duct 22 and from the plurality of outlets to the refrigeration room. 3 is supplied to the inside of the vegetable compartment 5 and then returned to the lower part of the evaporator room 16 for the refrigerator compartment. Thus, the inside of the refrigerator compartment 3 and the vegetable compartment 5 is cooled to a refrigerator temperature zone of 3 ° C. to 5 ° C., for example.

  When the refrigeration blower fan 21 is driven, the cool air generated by the freezer evaporator 20 passes from the upper part of the freezer evaporator 17 through a duct (not shown) and the ice making chamber 4 and the freezer. 6 and is returned to the lower part of the freezer compartment evaporator chamber 17 for circulation. Thus, the freezer compartment 6 and the ice making chamber 4 are cooled to a freezing temperature zone of, for example, −18 ° C. or lower.

  A refrigeration cycle 23 is incorporated in the refrigerator body 1. At this time, a machine room 24 is provided on the back side of the lower end of the refrigerator body 1, and a compressor 25 and a condenser 26 (shown only in FIG. 3) are provided in the machine room 24 to cool them. A fan 27 (see FIGS. 3 and 4) and the like are disposed. The compressor 25 is driven at a variable speed by, for example, inverter control. In normal times, for example, the rotational speed is driven at a constant value of 40 Hz at the inverter operating frequency.

  FIG. 3 shows the configuration of the refrigeration cycle 23. The refrigeration cycle 23 includes a switching valve 28 composed of a three-way valve having the compressor 25, the condenser (condenser) 26, one inlet 28a and first and second outlets 28b and 28c, and the switching valve 28. The first capillary tube 29 connected to the first outlet 28b, the evaporator 20 for the freezing chamber, the accumulator 30, and the check valve 31 are connected in a closed loop by a refrigerant pipe in this order, and the second outlet of the switching valve 28 The second capillary tube 32 and the refrigerating room evaporation 18 are connected between the connection point 28c and the connection point between the check valve 31 and the compressor 25.

  Thus, when the switching valve 28 is switched to the first outlet 28b side, the refrigerant passes through the condenser 26 by driving the compressor 25, and then passes through the first capillary tube 29 to evaporate the freezer compartment. After being supplied to the container 20, the accumulator 30 and the check valve 31 are sequentially passed back to the compressor 25 (freezer compartment cooling mode). On the other hand, when the switching valve 28 is switched to the second outlet 28c side, the refrigerant passes through the condenser 26 by driving the compressor 25, and then passes through the second capillary tube 32 to the refrigerator 18 for the refrigerator compartment. It is supplied and returned to the compressor 25 (refrigeration chamber cooling mode).

  At this time, in this embodiment, the switching valve 28 can also close both the first and second outlets 28b and 28c to block the refrigerant flow path (fully closed mode). An operation state in which the compressor 25 is driven in the fully closed mode of the switching valve 28 is referred to as a pump down mode. Further, in the present embodiment, the switching valve 28 can open both the first and second outlets 28b and 28c and allow the refrigerant to flow through both the refrigerator compartment evaporator 18 and the freezer compartment evaporator 20. (Simultaneous cooling mode). As will be described below, the switching valve 28 is controlled by the control device 33, and the refrigerant flow path switching means is constituted by these.

  Now, as shown in FIG. 4, the refrigerator main body 1 is provided with a control device 33 composed of a microcomputer or the like. The control device 33 receives signals from the refrigerator compartment temperature sensor 14 and the freezer compartment temperature sensor 15, and also receives signals from the refrigerator compartment defrost sensor 34 and the freezer compartment defrost sensor 35, and further. A signal from the refrigerator compartment door switch 36 for detecting the opening / closing of the door 7 of the refrigerator compartment 3 and the freezer compartment door switch 37 for detecting the opening / closing of the door 10 of the freezer compartment 6 are inputted. Yes. As shown in FIG. 3, the refrigerator compartment defrost sensor 34 is attached to a pipe in the vicinity of the refrigerator refrigerator 18, and the freezer compartment defrost sensor 35 is an accumulator in the vicinity of the refrigerator evaporator 20. 30 is attached.

  The control device 33 controls the compressor 25, the switching valve 28, the refrigeration blower fan 19, the refrigeration blower fan 21, the cooling fan 27, and the like based on the input signals in accordance with an operation control program stored in advance. It is supposed to be.

  At this time, the refrigeration blower fan 19 is turned on when the refrigerant is flowing through the refrigeration room evaporator 18 (refrigeration room cooling mode) and also when the freezer compartment cooling mode is executed. Thus, the frosting of the refrigerator compartment evaporator 18 is suppressed (moisture operation). The refrigeration blower fan 19 is stopped when the door 7 of the refrigerator compartment 3 is opened. The refrigeration blower fan 21 is turned on when a refrigerant is flowing through the freezer compartment evaporator 20. The cooling fan 27 is turned on when the compressor 25 is driven and turned on.

  As will be described later in the description of the operation, the control device 33 cools the refrigerator compartment 3 and the vegetable compartment 5 by flowing the refrigerant through the evaporator 18 for the refrigerator compartment by switching the switching valve 28 due to its software configuration. The cooling operation is executed while alternately switching between the refrigerating chamber cooling mode and the freezing chamber cooling mode in which the refrigerant flows through the freezer evaporator 20 and cools the freezing chamber 6 and the ice making chamber 4 (control operation). ). Thus, while the refrigerator compartment 3 (and the vegetable compartment 5) and the freezer compartment 6 (and the ice making compartment 4) are alternately cooled, the temperatures in all the chambers 3 to 6 are maintained near the set temperature. .

  In this case, the control device 33 sets an ON temperature and an OFF temperature of a predetermined temperature range with respect to a set temperature (target) for each of the refrigerator compartment 3 and the freezer compartment 6, and basically the refrigerator compartment temperature sensor. 14 and the temperature detected by the freezer temperature sensor 15 are configured to switch the switching valve 28.

  Specifically, for the refrigerator compartment 3, for example, the ON temperature is set to 5 ° C. and the OFF temperature is set to 2 ° C., and for the freezer compartment 6, for example, the ON temperature is set to −18 ° C. and the OFF temperature is set to −21 ° C. The The conditions for switching the mode are as follows: (1) When the detected temperature of the chamber being cooled has reached the OFF temperature, (2) More than a certain time (for example, 10 minutes) has elapsed since the previous mode switching, and no cooling is performed. When the detected temperature of the inside chamber rises to the ON temperature, (3) a predetermined time (for example, 60 minutes) has elapsed since the previous mode switching. When both the detected temperatures in the two chambers are equal to or lower than the OFF temperature, the compressor 25 is turned off.

  Further, in the present embodiment, during normal times (when the temperature detected by the freezer compartment defrost sensor 35 to be described later is less than −20 ° C.), the control device 33 operates in the refrigerator compartment cooling mode after executing the freezer compartment cooling mode. When there is a request for execution, the simultaneous cooling mode and the pump-down mode are executed for a predetermined time (for example, 5 minutes and 60 seconds) and then function as switching control means for shifting to the refrigerating room cooling mode. ing. By executing the simultaneous cooling mode and the pump down mode, it is possible to eliminate the shortage of refrigerant in the refrigerator 18 for the cold room when the mode is changed to the cold room cooling mode.

  In the present embodiment, when executing the simultaneous cooling mode and the pump down mode, the control device 33 determines whether or not the temperature of the freezer compartment 6 is higher than the set temperature. The execution time of the cooling mode and the pump down mode is shortened than usual, or the execution of the simultaneous cooling mode and the pump down mode is stopped to shift to the refrigerating room cooling mode.

  Specifically, in this embodiment, the magnitude of the temperature difference between the freezer compartment evaporator 20 and the freezer compartment evaporator 18 is determined based on the temperature detected by the freezer compartment defrost sensor 35, and the freezer compartment defrost sensor. If the detected temperature of 35 is less than a first threshold value, for example, −20 ° C., the normal simultaneous cooling mode and the pump down mode are executed, and the detected temperature is equal to or higher than the first threshold value (−20 ° C.) and When the threshold is less than 2 (for example, −12 ° C.), the simultaneous cooling mode and the pump-down mode are shortened (for example, 1 minute and 30 seconds). And the pump down mode is stopped. Therefore, in this embodiment, the freezer compartment defrost sensor 35 and the control device 33 function as a determination unit.

  Next, the operation of the above configuration will be described with reference to FIG. The flowchart of FIG. 1 shows a processing procedure related to the mode switching control executed by the control device 33. That is, when the power of the refrigerator main body 1 is turned on, a control operation is executed in step S1, and the freezer compartment 6 (and the ice making chamber 4) is cooled by executing the freezer compartment cooling mode, for example. Alternatively, at this time, when both the detected temperatures in the two chambers are equal to or lower than the OFF temperature, the compressor 25 is turned off. In the next step S2, it is determined whether or not there is a cooling request on the refrigerator compartment 3 side.

  In this case, when the freezer compartment temperature sensor 14 detects the ON temperature or more during execution of the freezer compartment cooling mode (after a certain period of time has elapsed), or when the freezer compartment cooling mode ends, the refrigerator compartment temperature sensor 14. When the detected temperature exceeds the OFF temperature, it is determined that there is a cooling request on the refrigerator compartment 3 side (Yes). If it is determined that there is a cooling request (Yes in step S2), it is first determined in step S3 whether the temperature detected by the freezer compartment defrost sensor 35 is less than −20 ° C.

  When the temperature detected by the freezer compartment defrost sensor 35 is less than −20 ° C. (Yes in step S3), in the next step S4, the simultaneous cooling mode (for example, 5 minutes) is executed in the normal execution time, and continues. In step S5, the pump down mode (for example, 60 seconds) is executed at a normal execution time. In step S6, the refrigerator compartment cooling mode is executed. In step S7, whether the temperature detected by the refrigerating room temperature sensor 14 has reached the set temperature (OFF temperature), or whether there is a cooling request on the freezer compartment 6 side (whether the freezer temperature sensor 15 has detected an ON temperature or higher). Is determined. If at least one of them is present (Yes in step S7), the control operation returns to step S1.

  Here, by the execution of the freezer cooling mode (step S1), the refrigerant flows through the freezer evaporator 20, the temperature thereof decreases, and the temperature detected by the freezer defrost sensor 35 decreases to about −30 ° C. . On the other hand, during this time, the refrigerant does not flow into the refrigerator compartment evaporator 18, and the temperature detected by the refrigerator compartment defrost sensor 34 is about 0 to 3 ° C. The freezer compartment evaporator 20 and the refrigerator compartment evaporator The temperature difference from 18 is about 30 deg.

  When there is a cooling request on the refrigerator compartment 3 side from this state, first, the simultaneous cooling mode is executed (step S4), whereby the refrigerant flows into both evaporators 18 and 20 and both chambers 3 and 6 are cooled. However, the refrigerant tends to flow to the freezer compartment evaporator 20 side where the temperature is low, hardly flows to the refrigerator compartment evaporator 18, and the amount of refrigerant circulation is not stable. Therefore, when the pump-down mode in which the switching valve 28 is closed is executed for a predetermined time (step S5), the refrigerant in the freezer compartment evaporator 20 is recovered, and then the refrigeration when the refrigerator compartment cooling mode is executed next. The refrigerating chamber 3 can be efficiently cooled with an appropriate amount of refrigerant flowing through the room evaporator 18.

  However, during execution of the freezer compartment cooling mode, a load (stored material) is put into the freezer compartment 6 or the door 10 of the freezer compartment 6 is frequently opened and closed (opened for a long time), so that the temperature in the freezer compartment 6 is increased. If the temperature of the evaporator 20 for the freezer compartment is relatively high (the temperature difference between the evaporators 18 and 20 is relatively small) and the mode is shifted to the simultaneous cooling mode, the refrigerant becomes Easily flows to the refrigerator 18 for the refrigerator compartment, and the amount of refrigerant circulating in the evaporator 18 for the refrigerator compartment increases. Then, after the pump-down mode is executed, when the mode is shifted to the refrigerating room cooling mode, the refrigerant flowing through the refrigerating room evaporator 18 becomes excessive, so-called liquid back phenomenon occurs, and the cooling capacity of the refrigerating room 3 decreases and the power consumption decreases There is a risk of increasing the amount.

  Therefore, in this embodiment, when the detected temperature of the freezer compartment defrost sensor 35 is relatively high (−20 ° C. or higher) in step S3 (No in step S3), the process proceeds to step S8. Thus, it is determined whether or not the detected temperature of the freezer compartment defrost sensor 35 is, for example, less than −12 ° C. If the detected temperature is −20 ° C. or higher and lower than −12 ° C. (Yes in Step S8), the simultaneous cooling mode is executed in a time shortened to 1 minute in Step S9, and Step S10 The pump down mode is also executed in a time shortened to 30 seconds.

  Thereafter, similarly to steps S6 and S7, the refrigerator compartment cooling mode is executed in step S11. In step S12, the temperature detected by the refrigerator compartment temperature sensor 14 has reached the set temperature (OFF temperature), or It is determined whether there is a cooling request on the freezer compartment 6 side (whether the freezer compartment temperature sensor 15 detects the ON temperature or higher), and if there is at least one (Yes), the control operation returns to step S1. .

  Further, when the detected temperature of the freezer compartment defrost sensor 35 is −12 ° C. or higher (No in step S8), the simultaneous cooling mode and the pump down mode are stopped in step S13. In step S14, the refrigerating room cooling mode is executed. In step S15, the temperature detected by the refrigerating room temperature sensor 14 has reached the set temperature (OFF temperature) or there is a cooling request on the freezer compartment 6 side. (Whether or not the freezer temperature sensor 15 detects the ON temperature or higher) and if there is at least one (Yes), the process returns to the control operation in step S1.

  Thus, according to the present embodiment, when the temperature detected by the freezer defrost sensor 35 is relatively high, the temperature difference between the freezer evaporator 20 and the refrigerator refrigerator 18 is relatively small. Thus, the simultaneous cooling mode and the pump down mode are executed with a shorter time than usual, or are stopped. Thereby, it can prevent beforehand that the refrigerant | coolant amount which flows into the evaporator 18 for refrigerator compartments when it transfers to refrigerator compartment cooling mode becomes excessive. As a result, the amount of refrigerant flowing through the refrigerator compartment evaporator 18 can be appropriately controlled, the cooling efficiency can be increased, and the so-called liquid back phenomenon can be suppressed to prevent wasteful power consumption and the like. It has an excellent effect of improving the reliability.

  In the first embodiment, when the temperature detected by the freezer compartment defrost sensor 35 is relatively high, the simultaneous cooling mode and the pump down mode are executed with a shorter time than usual or stopped. However, instead of this, the simultaneous cooling mode and the pump down mode may be executed by reducing the rotational speed of the compressor 25 from normal. Also by this, the same operation and effect can be obtained.

  In the first embodiment, only the temperature detected by the freezer compartment defrost sensor 35 is used to determine the temperature difference between the freezer compartment evaporator 20 and the refrigerator compartment evaporator 18. You may make it judge using the detection temperature of the refrigerator compartment temperature sensor 14 and the freezer compartment temperature sensor 15, or combining them with the detection temperature of the freezer compartment defrost sensor 35. FIG. According to this, the accuracy of determination can be further increased.

(2) Second Embodiment FIG. 5 shows a second embodiment of the present invention, and only differences from the first embodiment will be described below. In the second embodiment, the control device 33 sets and sets the number of rotations of the compressor 25 based on the internal temperature setting value and the detected temperatures of the refrigerator compartment temperature sensor 14 and the freezer compartment temperature sensor 15. It controls so that it may drive with the made rotation speed (for example, 30-70 Hz with the operating frequency of an inverter).

  And the control apparatus 33 monitors the input electric power (load) of the compressor 25, for example for every fixed time at the time of execution of a refrigerator compartment cooling mode, and an input value (duty) is increasing (it is larger than a setting reference value). In this case, it is determined that a so-called liquid back phenomenon has occurred due to an excessive amount of refrigerant flowing into the refrigerator 18 for the refrigerator compartment, and at that time, the refrigerator compartment for a predetermined number of times (one or more times) thereafter. Until the execution of the cooling mode is completed, the execution of the simultaneous cooling mode and the pump down mode is stopped, and control is performed so as to shift to the refrigerator compartment cooling mode.

  That is, in step S21, the control operation is executed, and in the next step S22, it is determined whether there is a cooling request on the refrigerator compartment 3 side. If it is determined that there is a cooling request (Yes in step S22), it is determined in step S23 that the input of the compressor 25 tends to increase during the previous execution of the refrigerator compartment cooling mode ( Whether or not the process has passed through steps S31 and S37. When it is not determined that there is an increasing tendency (No in step S23), in the next step S24, the simultaneous cooling mode (for example, 5 minutes) is executed in the normal execution time. Subsequently, in step S25, the pump-down mode (for example, 60 seconds) is executed at a normal execution time. Thereafter, in step S26, the refrigerator compartment cooling mode is executed.

  When the refrigerator compartment cooling mode is executed, the compressor 25 is driven and controlled while appropriately setting the number of revolutions of the compressor 25 (inverter operating frequency) based on the temperature detected by the temperature sensor 14 (step). S27). At this time, the input setting reference value of the compressor 25 is also set (step S28). When the execution of the refrigerator compartment cooling mode ends (Yes in step S29). In the next step S30, it is determined whether or not the input value of the compressor 25 at the time of executing the refrigerator compartment cooling mode is larger than the input setting reference value set in step S28.

  Here, the input value (load) of the compressor 25 during the execution of the refrigerating room cooling mode tends to increase (larger than the set reference value), which means that the amount of refrigerant flowing in the refrigerating room evaporator 18 is excessive. Thus, it can be determined that a so-called liquid back phenomenon has occurred. If the input value of the compressor 25 is not larger than the set reference value (No in step S30), the control operation returns to step S21. If the input value of the compressor 25 is larger than the set reference value (Yes in step S30), it is determined in step S31 that the input of the compressor 25 tends to increase, and then the process proceeds to step S21. Return.

  If it is determined in step S23 that the input of the compressor 25 tends to increase during the previous execution of the refrigerator compartment cooling mode (Yes in step S23), the simultaneous cooling mode and the pump described above are used. The down mode is stopped, and the process proceeds to the refrigerating room cooling mode as it is in step S32. Thereafter, in steps S33 to S37, processing similar to that in steps S27 to S31 is executed.

  According to the second embodiment, whether the so-called liquid back phenomenon has occurred or not is determined depending on whether or not the input value of the compressor 25 tends to increase during the execution of the previous cold room cooling mode. However, when the input value of the compressor 25 tends to increase, the simultaneous cooling mode and the pump down mode are stopped, so that the amount of refrigerant flowing into the refrigerator compartment evaporator 18 is reduced. As a result, similarly to the first embodiment, the amount of refrigerant flowing through the refrigerator for the refrigerator compartment 18 can be appropriately controlled, the cooling efficiency can be increased, and the so-called liquid back phenomenon can be suppressed and wasteful. Therefore, it is possible to prevent unnecessary power consumption and improve reliability.

  In the second embodiment, when it is determined that the input value of the compressor 25 is increasing in the previous refrigerator compartment cooling mode, the simultaneous cooling mode and the pump down before the transition to the next refrigerator compartment cooling mode are performed. Although the execution of the mode is stopped, the execution of the simultaneous cooling mode and the pump down mode is stopped a predetermined number of times (two times or when the input value of the compressor 25 is determined to increase once) It may be continued until the (three times) refrigerator compartment cooling mode is completed, or may be performed for a predetermined time. Instead of stopping execution, the execution time of the simultaneous cooling mode and the pump down mode may be shortened. Of course, these modes may be executed with the rotational speed of the compressor 25 lowered.

  By the way, in each said Example, although it was made to reduce execution of simultaneous cooling mode and pump down mode based on the temperature of freezer compartment 6 (evaporator 20 for freezer compartment), or the input value of compressor 25, It is possible to replace or add to the following configuration. That is, when the door 7 of the refrigerating room 3 is opened and the refrigerating fan 19 is stopped, the low temperature of the refrigerating room evaporator 18 is maintained. Therefore, the refrigerating fan 19 is frequently stopped (for a long time). ), The temperature difference between the freezer evaporator 20 and the refrigerator refrigerator 18 is relatively small.

  Therefore, based on detection of the cold room door switch 36, it is determined whether or not the door 7 of the cold room 3 has been opened frequently (for a long time), and the cooling fan 19 is stopped for a long time. In such a case, it is possible to reduce the amount of the refrigerant flowing into the refrigerator compartment evaporator 18 by reducing the execution of the simultaneous cooling mode and the pump down mode. Accordingly, the amount of refrigerant flowing through the refrigerator compartment evaporator 18 can be appropriately controlled, so that the cooling efficiency can be increased and the so-called liquid back phenomenon can be suppressed.

  Further, in each of the above embodiments, both the simultaneous cooling mode and the pump down mode are executed at the normal time before shifting to the refrigerating room cooling mode, but either one is executed. The present invention can also be applied. Furthermore, even when both the simultaneous cooling mode and the pump down mode are executed, in either one of the modes, control of shortening, stopping, and lowering the rotational speed of the compressor 25 may be performed.

(3) Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the hardware configuration of the refrigerator body 1 is the same as that in the first and second embodiments. Detailed description will be omitted, and the following description will focus on differences from the first and second embodiments.

  As described above, the control device 33 performs control so as to drive the refrigeration blower fan 21 during execution of the freezer compartment cooling mode in which the refrigerant flows through the freezer compartment evaporator 20. In the third embodiment, during the normal cooling operation, the control device 33 drives the refrigeration blower fan 21 even when the refrigerator compartment cooling mode is executed. Therefore, the control device 33 functions as a refrigeration blower fan control means. Further, by this control, even when the refrigerator compartment cooling mode is executed, the temperature of the surface of the freezer compartment evaporator 20 is sufficiently low at this time, so that the freezer compartment 6 is driven by driving the freezing blower fan 21. And cold air can be supplied with respect to the ice-making chamber 4 (ice-making tray not shown), and it can be made to contribute to fixed cooling.

  Further, as in the first embodiment, the control device 33 switches and controls the switching valve 28 based on the detected temperature and time of the refrigerator compartment temperature sensor 14 and the freezer compartment temperature sensor 15 during normal cooling operation. When there is a request for execution of the refrigerating room cooling mode after execution of the freezing room cooling mode, the simultaneous cooling mode and the pump down mode are executed for a predetermined time (for example, 5 minutes and 60 seconds), and then the refrigerating room Transition to cooling mode. At the same time, although not described in the first embodiment, the control device 33 performs the defrosting operation every time the integrated value of the execution time of the freezer cooling mode reaches a predetermined time (for example, 10 hours). It is like that.

  Here, the defrosting operation will be briefly described. Although not shown in the drawing, the freezing room evaporator 20 is provided with a defrosting heater for melting frost adhering to the surface of the freezing room evaporator 20 by heating. Also, the power supply is controlled by the control device 33. When the integrated value of the execution time of the freezer compartment cooling mode reaches a predetermined time (for example, 10 hours), the control device 33 performs the defrost operation after executing the precool operation. In the precool operation, first, with the set temperature of the freezer compartments 6 and 4 shifted by, for example, 3 degrees to the low temperature side, the compressor 25 is continuously driven at a high rotational speed to execute the freezer compartment cooling mode. 6 and 4 are forcibly cooled, and then the refrigerator compartments 3 and 5 are forcibly cooled by switching to the refrigerator compartment cooling mode.

  The defrosting operation is executed by energizing the defrosting heater in a state where the compressor 25 and the fans 19, 21, 27 are stopped, and the freezer compartment defrosting sensor 35 has a predetermined temperature (for example, 10 ° C.) or higher. The process is terminated based on detecting the temperature. As described above, since the refrigeration room evaporator 18 has almost no frost formation, it is not particularly necessary to melt the frost by heating. However, the refrigeration room evaporator 18 is also provided with a defrosting heater. It may be provided and heated in the same manner.

  In the present embodiment, as will be described later in the flowchart description, the control device 33 can be installed in the refrigerator compartment cooling mode at the time of installation, after power-on after a power failure, and after the completion of the defrosting operation. Is performed a predetermined number of times (for example, three times), and the detection temperature of the freezing chamber defrost sensor 35 is equal to or lower than a set temperature (for example, −20 ° C.). Until either of the conditions is satisfied, the execution of the simultaneous cooling mode and the pump down mode is stopped, and control is performed so as to shift to the refrigerator compartment cooling mode as it is. In this case, it is determined from the detected temperature of the freezer compartment defrost sensor 35 that the temperature of the freezer compartment 6 has become equal to or lower than the set temperature.

  At the same time, when the execution of the simultaneous cooling mode and the pump down mode is stopped to shift to the refrigerator compartment cooling mode, the operation of the refrigeration blower fan 21 during the execution of the refrigerator compartment cooling mode is stopped. It has become.

  The flowchart of FIG. 6 shows a processing procedure related to mode switching control executed by the control device 33 when the power is turned on or after the defrosting operation is completed. That is, when the power is turned on or the defrosting operation is completed (Yes in step S41), it is determined in next step S42 whether there is a cooling request on the refrigerator compartment 3 side. When the refrigerator compartment 3 has exceeded the ON temperature, or when the execution time of the freezer compartment cooling mode has continued for 40 minutes or more, it is determined that there is a cooling request on the refrigerator compartment 3 side.

  If there is a cooling request on the refrigerator compartment 3 side (Yes in step S42), it is determined in the next step S43 whether or not the refrigerator compartment cooling mode has been performed a predetermined number of times (for example, three times). When the refrigerator compartment cooling mode has not been performed a predetermined number of times (No in step S43), in the next step S44, the detected temperature of the freezer compartment defrost sensor 35 is equal to or lower than a set temperature (for example, −20 ° C.). It is judged whether there is. If the detected temperature of the freezer compartment defrost sensor 35 is less than the set temperature (No in step S43), in the next step S45, the cumulative execution time of the refrigerator compartment cooling mode is set to a predetermined time (for example, 60 minutes). It is judged whether it has arrived.

  At this time, if any of the conditions of steps S43 to 45 is satisfied (Yes in any of steps S43 to 45), the simultaneous cooling mode is first executed (step S46), and then the pump down mode is set. It is executed for a predetermined time (step S47). And it transfers to refrigerator compartment cooling mode (step S48). At the time of execution of the refrigerator compartment cooling mode at this time, the refrigeration blower fan 21 is driven (step S49). Thereafter, a normal cooling operation is performed (step S50). Even when it is determined that the power is turned on or after the defrosting operation is not completed (No in step S41), the normal cooling operation is executed (step S50).

  On the other hand, if none of the conditions in steps S43 to 45 is satisfied (No in step S45), in the next step S51, refrigeration is performed with the simultaneous cooling mode and the pump down mode omitted. Transition to room cooling mode. However, at this time, the refrigeration blower fan 21 is stopped even when the refrigerator compartment cooling mode is executed. Thereafter, it is determined whether or not there is a cooling request on the freezer compartment 6 side (step S52). If there is (Yes), the process proceeds to the freezer compartment cooling mode (step S53). Thereafter, the processing from step S42 is repeated.

  With such control, after the power is turned on such as at the beginning of use when the refrigerator body 1 is installed or after a power failure is restored, and after the defrosting operation for the freezer compartment evaporator 20, the freezer compartment 6 (freezer compartment evaporator) is used. When the temperature of 20) is relatively high and a sufficient temperature difference between the freezer evaporator 20 and the refrigerator evaporator 18 cannot be maintained, the simultaneous cooling mode and the pump down mode are omitted. As a result, the amount of refrigerant flowing through the refrigerator compartment evaporator 18 can be reduced.

  The refrigeration room cooling mode is executed a predetermined number of times (for example, three times), and the detection temperature of the freezing room defrost sensor 35 is equal to or lower than a set temperature (for example, −20 ° C.). It is considered that a sufficient temperature difference between the freezer compartment evaporator 20 and the refrigerator compartment evaporator 18 was obtained by satisfying one of the following conditions: By performing the cooling operation, it is possible to appropriately control the amount of the refrigerant flowing through the refrigerator compartment evaporator 18, and to improve the cooling efficiency. In particular, even at the start of use in summer, the load applied to the compressor 25 can be suppressed, and the temperature rise of the control board can be suppressed.

  In addition, when the simultaneous cooling mode and the pump down mode are omitted and the mode is changed to the refrigerator compartment cooling mode, the operation of the refrigeration blower fan 21 is stopped even when the refrigerator compartment cooling mode is executed. . Thereby, the useless temperature rise resulting from the ventilation with respect to the freezer compartment evaporator 20 can be suppressed, and it can suppress that the refrigerant | coolant more than a required quantity flows into the evaporator 18 for refrigerator compartments.

  Incidentally, FIG. 7 shows the case where the present inventors perform control to stop the operation of the refrigeration blower fan 21 until the execution of the refrigerator compartment cooling mode is completed three times after the power is turned on (a), and so on. When the operation of the refrigeration blower fan 21 is performed during execution of the refrigerating room cooling mode without performing any control, the refrigerating room 3 (temperature detected by the refrigerating room temperature sensor 14) and the freezing room 6 (freezer room) The test result which investigated the mode of the temperature change of the detection temperature of the temperature sensor 15 is shown.

  From this result, it can be understood that the control of the refrigeration blower fan 21 of the present embodiment suppresses the temperature rise of the freezer compartment 6 during execution of the refrigerating compartment cooling mode, and the width of the temperature fluctuation becomes small. In the fourth and fifth refrigerating room cooling modes in the figure, the operation stop of the refrigeration blower fan 21 is based on the detection of the ice making stop (water shortage or full) in the ice making chamber 4.

  As described above, according to the present embodiment, similarly to the first and second embodiments, it is possible to appropriately control the amount of the refrigerant flowing through the refrigerator 18 for the refrigerating chamber, to increase the cooling efficiency, and so-called The liquid back phenomenon can be suppressed, wasteful power consumption and the like can be prevented, and an excellent effect that the reliability can be improved can be obtained.

  In the third embodiment, the simultaneous cooling mode and the pump down mode are omitted when none of the three conditions are satisfied. However, one or two of the above three conditions are omitted. It may be set as a condition. The specific numerical values of the conditions such as the predetermined number of times, the set temperature, and the predetermined time are merely examples, and of course can be changed.

  Further, instead of omitting both the simultaneous cooling mode and the pump down mode, only one of them may be omitted. In this case, the control of the refrigeration blower fan 21 may be omitted. Furthermore, the refrigeration blower fan 21 may be controlled without omitting the simultaneous cooling mode and / or the pump down mode.

  In addition, the present invention is not limited to the above-described embodiments. For example, various changes can be made to the configuration (arrangement) of each chamber in the refrigerator main body and the configuration such as the position where two evaporators are provided. is there. In addition, specific numerical values such as the set temperature, the ON temperature, the OFF temperature, the time for executing the mode, the driving frequency of the compressor 25, and the like are merely shown as examples, and are appropriately set. The present invention can be changed and implemented as appropriate without departing from the scope of the invention.

The flowchart which shows the 1st Example of this invention and shows the process sequence regarding mode switching control. Longitudinal side view schematically showing the entire structure of the refrigerator Diagram showing the configuration of the refrigeration cycle Block diagram showing the electrical configuration of the main part FIG. 1 equivalent view showing a second embodiment of the present invention. FIG. 1 equivalent view showing a third embodiment of the present invention. The figure which shows the test result which investigated the temperature change of the refrigerating room and the freezer compartment in the case (a) which implemented stop control of the ventilation fan for freezing, and the case (b) which did not implement

Explanation of symbols

  In the drawings, 1 is a refrigerator main body, 3 is a refrigerator compartment, 6 is a freezer compartment, 7 is a door, 14 is a refrigerator compartment temperature sensor, 15 is a refrigerator compartment temperature sensor, 18 is an evaporator for a refrigerator compartment, and 19 is a refrigeration fan. , 20 is a freezer evaporator, 21 is a refrigeration fan, 23 is a refrigeration cycle, 25 is a compressor, 28 is a switching valve (switching control means), 33 is a control device (switching control means, judgment means), 35 Denotes a freezer compartment defrost sensor, and 36 denotes a refrigerator compartment door switch.

Claims (8)

An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
A refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, a freezing room cooling mode for flowing the refrigerating room evaporator, and a fully closed mode for blocking the refrigerant flow path. Refrigerant flow switching means for switching;
Before executing the refrigerating room cooling mode, a pump down mode for driving the compressor in the fully closed mode is executed before controlling the refrigerant flow switching means so as to shift to the refrigerating room cooling mode. A refrigerator comprising switching control means for performing
Providing a judging means for judging whether or not the temperature of the freezer compartment is higher than a set temperature;
The switching control unit shortens the execution time of the pump down mode from the normal time or does not execute the pump down mode when the determination unit determines that the temperature of the freezer compartment is higher than a set temperature. It is comprised so that it may transfer to a refrigerator compartment cooling mode. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation Refrigerant flow path switching means for switching between the simultaneous cooling mode flowing to both of the vessel;
Before executing the refrigerating room cooling mode, the refrigerator includes a switching control means for controlling the refrigerant flow switching means so as to shift to the refrigerating room cooling mode after the simultaneous cooling mode is executed. And
Providing a judging means for judging whether or not the temperature of the freezer compartment is higher than a set temperature;
The switching control means reduces the execution time of the simultaneous cooling mode from the normal time or does not execute the simultaneous cooling mode when the determining means determines that the temperature of the freezer compartment is higher than a set temperature. It is comprised so that it may transfer to a refrigerator compartment cooling mode. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation A refrigerant flow path switching means for switching between a simultaneous cooling mode flowing to both of the containers and a fully closed mode for blocking the refrigerant flow path;
Before executing the refrigerating room cooling mode, the refrigerant is configured so that the simultaneous cooling mode and the pump-down mode for driving the compressor in the fully closed mode are sequentially executed before the refrigerating room cooling mode is entered. A refrigerator comprising switching control means for controlling the flow path switching means,
Determining means for determining whether the temperature of the freezer compartment is higher than a set temperature;
When the determination unit determines that the temperature of the freezer compartment is higher than a set temperature, the compression is performed by reducing the rotational speed of the compressor in the simultaneous cooling mode and / or the pump-down mode from a normal level. And a refrigerator.   The determination means detects the temperature of the freezer compartment temperature sensor that detects the temperature of the freezer compartment, the refrigerator compartment defrost sensor that detects the temperature of the evaporator portion of the refrigerator compartment, or the temperature of the evaporator portion of the refrigerator compartment. The refrigerator according to any one of claims 1 to 3, wherein whether or not the temperature of the freezer compartment is higher than a set temperature is determined based on detection of a freezer compartment defrost sensor. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A refrigerating room fan for supplying cold air from the refrigerating room evaporator to the refrigerating room;
A freezer evaporator for cooling the freezer;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation A refrigerant flow path switching means for switching between a simultaneous cooling mode flowing to both of the containers and a fully closed mode for blocking the refrigerant flow path;
Before executing the refrigerating room cooling mode, the refrigerant is configured so that the simultaneous cooling mode and the pump-down mode for driving the compressor in the fully closed mode are sequentially executed before the refrigerating room cooling mode is entered. A refrigerator comprising switching control means for controlling the flow path switching means,
When the refrigerating room door is opened and the refrigerating room fan stops, the execution time of the simultaneous cooling mode and / or the pump down mode until a predetermined time elapses or until the refrigerating room cooling mode is executed a predetermined number of times. Of the compressor in the simultaneous cooling mode and / or the pump-down mode, or the rotation of the compressor in the simultaneous cooling mode and / or the pump-down mode. A refrigerator provided with control means for reducing the number from a normal one. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation A refrigerant flow path switching means for switching between a simultaneous cooling mode flowing to both of the containers and a fully closed mode for blocking the refrigerant flow path;
Before executing the refrigerating room cooling mode, the refrigerant is configured so that the simultaneous cooling mode and the pump-down mode for driving the compressor in the fully closed mode are sequentially executed before the refrigerating room cooling mode is entered. A refrigerator comprising switching control means for controlling the flow path switching means,
When the compressor load during the execution of the cold room cooling mode is increasing, the execution time of the simultaneous cooling mode and / or the pump down mode is set to be longer than usual until the cold room cooling mode is executed a predetermined number of times. Or the transition to the cold room cooling mode without executing the simultaneous cooling mode and / or the pump down mode, or the rotational speed of the compressor in the simultaneous cooling mode and / or the pump down mode is made higher than usual. A refrigerator characterized in that it is provided with control means for lowering and executing. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation A refrigerant flow path switching means for switching between a simultaneous cooling mode flowing to both of the containers and a fully closed mode for blocking the refrigerant flow path;
Before executing the refrigerating room cooling mode, the refrigerant is configured so that the simultaneous cooling mode and the pump-down mode for driving the compressor in the fully closed mode are sequentially executed before the refrigerating room cooling mode is entered. A refrigerator comprising switching control means for controlling the flow path switching means,
After the power is turned on and / or after the defrosting operation is completed, until the refrigerator compartment cooling mode is executed a predetermined number of times, or until the temperature of the freezer compartment is equal to or lower than the set temperature, or the execution time of the refrigerator compartment cooling mode is a predetermined time. A refrigerator provided with control means for shifting to the refrigerating room cooling mode without executing the simultaneous cooling mode and / or the pump down mode until the time has elapsed. An evaporator for the refrigerator compartment for cooling the refrigerator compartment,
A freezer evaporator for cooling the freezer;
A refrigeration blower fan for supplying cold air from the freezer evaporator to the freezer compartment;
Refrigerating room cooling mode for flowing the refrigerant circulated by driving the compressor to the refrigerating room evaporator, freezing room cooling mode for flowing the refrigerating room evaporator, refrigerating room evaporator and freezing room evaporation A refrigerant flow path switching means for switching between a simultaneous cooling mode flowing to both of the containers and a fully closed mode for blocking the refrigerant flow path;
Refrigeration blower fan control means for controlling the refrigeration blower fan so as to be driven even during execution of the refrigerator compartment cooling mode;
Before executing the refrigerating room cooling mode, the refrigerant is configured so that the simultaneous cooling mode and the pump-down mode for driving the compressor in the fully closed mode are sequentially executed before the refrigerating room cooling mode is entered. A refrigerator comprising switching control means for controlling the flow path switching means,
The refrigeration blower fan control means, after turning on the power and / or after the completion of the defrosting operation, until the refrigerator compartment cooling mode is executed a predetermined number of times, or until the temperature of the freezer compartment is equal to or lower than a set temperature, or refrigeration. A refrigerator configured to stop the operation of the refrigeration blower fan during execution of the refrigerating room cooling mode until the execution time of the room cooling mode elapses for a predetermined time.

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