JP2012241975A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately secure an operation time for PC cooling, and to suppress a change in the temperature of a refrigerating room in a refrigerator having an off-cycle cooling mode (c) which cools the refrigerating room while a freezing cycle is stopped in addition to an FC cooling mode (b) and a PC cooling mode (a).SOLUTION: Independently of the control of the FC cooling mode (b) and the PC cooling mode (a), by controlling the off-cycle cooling mode (c) based on a temperature detected by a DFP temperature sensor, it is possible to appropriately adjust a time for off-cycle cooling, sufficiently secure a time for PC cooling and suppress a change in the temperature of the refrigerator.

Description

  The present invention has a damper that has a damper that blocks cold air in a freezing room and a refrigerating room, respectively, and uses a single evaporator to individually cool the freezing room and the refrigerating room, thereby improving the efficiency of the refrigerating cycle. It is about.

  From the viewpoint of energy saving, there are refrigerators for household use that have improved the efficiency of the refrigeration cycle by cooling each of the freezer compartment and the refrigerator compartment by using one evaporator. This enhances the efficiency of the refrigeration cycle by cooling the refrigerator compartment having a relatively high air temperature at an evaporation temperature higher than that of the freezer compartment.

  Furthermore, it has been proposed to cool the refrigerating chamber using a cooler of the evaporator, which is at a low temperature while the compressor is stopped, using dampers provided in each of the freezing chamber and the refrigerating chamber to block cold air (for example, , See Patent Document 1). This is intended to save energy by reusing the latent heat of melting of frost adhering to the evaporator, thereby reducing the capacity of the refrigeration cycle required for cooling the refrigerator compartment while reducing heater power during defrosting. It is.

  Hereinafter, a conventional refrigerator will be described with reference to the drawings.

  FIG. 4 is a longitudinal sectional view of a conventional refrigerator, FIG. 5 is a configuration diagram of a refrigeration cycle of the conventional refrigerator, and FIG. 6 is a schematic diagram of the temperature behavior of the conventional refrigerator temperature sensor and the refrigerator compartment.

  4 and 5, the refrigerator 11 includes a housing 12, a door 13, legs 14 that support the housing 12, a lower machine room 15 provided in a lower portion of the housing 12, and a refrigeration disposed in an upper portion of the housing 12. It has the freezer compartment 18 arrange | positioned at the chamber 17 and the lower part of the housing | casing 12. FIG.

  In addition, as components constituting the refrigeration cycle, a compressor 56 housed in the lower machine chamber 15, an evaporator 20 housed on the back side of the freezer room 18, and a main condenser 21 housed in the lower machine room 15 are provided. Have. Further, it has a partition wall 22 that partitions the lower machine chamber 15, a fan 23 that is attached to the partition wall 22 to air-cool the main condenser 21, an evaporating dish 57 installed on the top of the compressor 56, and a bottom plate 25 of the lower machine chamber 15. Yes.

  It has a plurality of air intakes 26 provided in the bottom plate 25, an exhaust port 27 provided on the back side of the lower machine room 15, and a communication air passage 28 connecting the exhaust port 27 of the lower machine room 15 and the upper part of the housing 11. ing. Here, the lower machine chamber 15 is divided into two chambers by the partition wall 22, and the main condenser 21 is housed on the windward side of the fan 23, and the compressor 56 and the evaporating dish 57 are housed on the leeward side.

  Furthermore, as components constituting the refrigeration cycle, a dew-proof pipe 37 and a dew-proof pipe 37 which are located downstream of the main condenser 21 and are thermally coupled to the outer surface of the housing 12 around the opening of the freezer compartment 18. It is located downstream, and has a dryer 38 that dries the circulating refrigerant, a throttle 38 that combines the dryer 38 and the evaporator 20 and depressurizes the circulating refrigerant.

  In addition, an evaporator fan 50 that supplies cold air generated in the evaporator 20 to the refrigerator compartment 17 and the freezer compartment 18, a freezer damper 51 that shuts off the cold air supplied to the freezer compartment 18, and cold air supplied to the refrigerator compartment 17 It has a refrigerator compartment damper 52 that shuts off, a duct 53 that supplies cold air to the refrigerator compartment 17, an FCC temperature sensor 54 that detects the temperature of the freezer compartment 18, and a PCC temperature sensor 55 that detects the temperature of the refrigerator compartment 17.

  The operation of the conventional refrigerator configured as described above will be described below.

  When the temperature detected by the PCC temperature sensor 55 rises to a predetermined ON temperature, the freezer compartment damper 51 is closed while the compressor 56 is stopped, the refrigerator compartment damper 52 is opened, and the evaporator fan 50 is driven. Thereby, the refrigerator compartment 17 is cooled using the evaporator 20 and the low-temperature sensible heat of the frost adhering to the evaporator 20 and the latent heat of fusion of the frost (hereinafter, this operation is referred to as “off-cycle cooling”).

  After a predetermined time from the start of off-cycle cooling, the freezer damper 51 is closed, the refrigerator compartment damper 52 is opened, and the compressor 56, the fan 23, and the evaporator fan 50 are driven. By driving the fan 23, the main condenser 21 side of the lower machine chamber 15 partitioned by the partition wall 22 becomes negative pressure, and external air is sucked from the plurality of intake ports 26, and the compressor 56 and the evaporating dish 57 side become positive pressure. The air in the machine room 15 is discharged to the outside through a plurality of discharge ports 27.

  On the other hand, the refrigerant discharged from the compressor 56 is condensed while leaving a part of the gas while exchanging heat with the outside air in the main condenser 21 and then supplied to the dewproof pipe 37. The refrigerant that has passed through the dew-proof pipe 37 radiates heat through the housing 12 and condenses while warming the opening of the freezer compartment 18. The liquid refrigerant that has passed through the dew-proof pipe 37 is dehydrated by the dryer 38, depressurized by the throttle 39, and is evaporated by the evaporator 20, while exchanging heat with the air in the refrigerator compartment 17 and cooling the refrigerator compartment 17. Then, it is returned to the compressor 56 as a gaseous refrigerant (hereinafter, this operation is referred to as “PC cooling”).

  At this time, since the temperature of the air in the refrigerator compartment 17 is higher than that of the freezer compartment 18 and the temperature of the evaporator 20 is increased by off-cycle cooling, it quickly reaches a high evaporation temperature during PC cooling. be able to.

  Next, when the temperature detected by the PCC temperature sensor 55 falls to a predetermined OFF temperature or when the temperature detected by the FCC temperature sensor 54 rises to a predetermined ON temperature, the freezer damper 51 is opened and refrigerated. The chamber damper 52 is closed, and the compressor 56, the fan 23, and the evaporator fan 50 are driven. Thereafter, by operating the refrigeration cycle in the same manner as PC cooling, the freezer compartment 18 is cooled by exchanging heat between the inside air of the freezer compartment 18 and the evaporator 20 (hereinafter, this operation is referred to as “FC cooling”).

  Next, when the temperature detected by the FCC temperature sensor 54 decreases to an OFF temperature of a predetermined value, the freezer damper 51 and the refrigerator compartment damper 52 are closed, and the compressor 56, the fan 23, and the evaporator fan 50 are stopped (hereinafter referred to as the “cooling chamber damper 51”). This operation is called “cooling stop”). During normal operation, a series of operations of off-cycle cooling, PC cooling, FC cooling, and cooling stop are repeated in order.

  In FIG. 6, section e corresponds to off-cycle cooling, section f corresponds to PC cooling, section g corresponds to FC cooling, and section h corresponds to cooling stop operation. The compressor 56 is driven between the section f and the section g, and is stopped between the section h and the section e. Moreover, the freezer compartment 18 is cooled during the section g, and the refrigerator compartment 17 is cooled between the section e and the section f. Here, the reason why the temperature change in the upper part of the refrigerating chamber 17 is large is that the upper part is adjacent to the high temperature outside air, while the lower part is adjacent to the low temperature freezing room 18, so during the non-cooling period. This is because the temperature difference between the upper and lower sides becomes larger and the air volume at the upper part is increased during cooling to quickly cool the upper part at a high temperature.

By this series of operations, the efficiency of the refrigeration cycle can be increased by keeping the temperature of the evaporator 20 at the time of PC cooling higher than that at the time of FC cooling, and the frost adhering to the evaporator 20 is melted by off-cycle cooling. By reusing latent heat, energy can be saved by reducing the capacity of the refrigeration cycle necessary for cooling the refrigerator compartment 17 while reducing heater power (not shown) during defrosting.

Japanese Patent Laid-Open No. 9-236369

  However, in the conventional refrigerator configuration, the PC cooling time is reduced by off-cycle cooling, and as a result, there is a problem that high refrigeration cycle efficiency cannot be obtained during PC cooling. This is because the circulating refrigerant is in a transitional state at the start of the refrigeration cycle, and the refrigeration capacity corresponding to the evaporation temperature cannot be fully exhibited.

  Moreover, when performing off cycle cooling and PC cooling continuously in order to raise the temperature of the evaporator 20, it is difficult to ensure the PC cooling time by appropriately limiting the time of off cycle cooling. This is because the cooling rate of off-cycle cooling varies greatly depending on the frosting state and temperature of the evaporator 20 and also differs from the cooling rate of PC cooling, so there is a time delay with respect to the temperature change of the air in the refrigerator compartment 17. This is because the PCC temperature sensor 55 cannot be used to accurately control the ratio between off-cycle cooling and PC cooling.

  Moreover, in the structure of the conventional refrigerator, the problem that the temperature change of the refrigerator compartment 17, especially the temperature change of upper part becomes large generate | occur | produces. This is because when the refrigerator compartment 17 is cooled alone, the air temperature in the vicinity of the outlet of the refrigerator compartment 17 is drastically lowered and the refrigerator compartment 17 is cooled as compared to cooling the refrigerator compartment 17 and the refrigerator compartment 18 simultaneously. This is because the non-cooling time is not increased. In order to solve this problem, it is necessary to further reduce the time of off-cycle cooling and PC cooling, and to frequently repeat cooling and non-cooling of the refrigerator compartment 17, resulting in high refrigeration cycle efficiency during PC cooling. The problem that it cannot be obtained occurs.

  An object of the present invention is to solve the conventional problems, and it is an object of the present invention to appropriately secure an operation time for PC cooling and to suppress a temperature change in a refrigerator compartment.

  In order to solve the conventional problems, a refrigerator according to the present invention is installed in an upper part of an FCC temperature sensor that detects the temperature of the freezer, a PCC temperature sensor that detects the temperature of the refrigerator, and the refrigerator. A DFP temperature sensor that detects the temperature of the upper part of the chiller, opens the freezer damper, closes the refrigerator compartment damper, cools the freezer compartment while operating the refrigeration cycle, and has a freezer damper PC cooling mode that closes and opens the refrigerator compartment damper and cools the refrigerator compartment while operating the refrigeration cycle, and the evaporator while closing the refrigerator compartment damper and opens the refrigerator compartment damper and stops the refrigeration cycle By operating the fan, it has an off-cycle cooling mode that exchanges heat between the evaporator and the air in the refrigerator compartment, and is based on the temperature detected by the FCC temperature sensor or PCC temperature sensor. With determining the ON / OFF of the FC cooling mode and PC cooling mode it has, is characterized in determining the ON / OFF of the off cycle cooling mode based on the temperature detected by the DFP temperature sensor.

  Accordingly, it is possible to appropriately adjust the off-cycle cooling time to ensure a sufficient PC cooling time, and to suppress a temperature change in the upper part of the refrigerator compartment.

In the refrigerator of the present invention, the off-cycle cooling time is appropriately adjusted by controlling the off-cycle cooling mode based on the temperature detected by the DFP temperature sensor independently of the control of the FC cooling mode and the PC cooling mode. The PC cooling time can be secured sufficiently, the temperature change in the upper part of the refrigerator compartment can be suppressed, and the efficiency of the refrigerator can be saved by obtaining high efficiency of the refrigeration cycle during PC cooling.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of this invention Cycle configuration diagram of refrigerator in Embodiment 1 of the present invention Schematic diagram of temperature sensor behavior of refrigerator in embodiment 1 of the present invention Vertical section of a conventional refrigerator Cycle configuration diagram of a conventional refrigerator Schematic diagram of temperature behavior of conventional refrigerator temperature sensor and refrigerated room

  The first invention includes a refrigerator compartment, a freezer compartment, a refrigeration cycle, an evaporator that is a component of the refrigeration cycle, and an evaporator that supplies cold air generated in the evaporator to the refrigerator compartment and the freezer compartment. Detecting the temperature of the freezer, a fan, a refrigerating room damper that blocks cool air supplied from the evaporator to the refrigerating room, a freezer damper that blocks cool air supplied from the evaporator to the freezer In the refrigerator comprising: an FCC temperature sensor that detects the temperature of the refrigerator compartment; a PCC temperature sensor that detects the temperature of the refrigerator compartment; and a DFP temperature sensor that is installed above the PCC temperature sensor and detects the temperature of the upper portion of the refrigerator compartment. An FC cooling mode for opening the chamber damper, closing the refrigerator compartment damper, and supplying the cool air generated by the evaporator while operating the refrigeration cycle to cool the freezing chamber. A PC cooling mode for closing the freezer damper, opening the refrigerator compartment damper, supplying cold air generated by the evaporator while operating the refrigeration cycle, and cooling the refrigerator compartment; and An off-cycle cooling mode for exchanging heat between the evaporator and air in the refrigerator compartment by closing the compartment damper, opening the refrigerator compartment damper, and operating the evaporator fan while stopping the refrigeration cycle And determining whether the FC cooling mode and the PC cooling mode are ON / OFF based on the detected temperature of the FCC temperature sensor or the PCC temperature sensor, and determining the off cycle based on the detected temperature of the DFP temperature sensor. Since the refrigerator is characterized by determining whether the cooling mode is ON / OFF, the PC cooling operation time can be appropriately secured. Can.

  This is because the off-cycle cooling operation time is controlled based on the DFP temperature sensor provided in the upper part of the refrigerating room where the temperature change is relatively large, thereby accurately adjusting the ratio between off-cycle cooling and PC cooling for cooling the refrigerating room. Therefore, the PC cooling operation time can be appropriately secured.

  According to a second aspect of the present invention, when the temperature detected by the FCC temperature sensor or the PCC temperature sensor rises, the FC cooling mode and the PC cooling mode are given priority over the off-cycle cooling mode. Therefore, it is possible to suppress a decrease in the operation time of PC cooling and FC cooling due to off-cycle cooling, and it is possible to suppress temperature changes in the refrigerator compartment and the freezer compartment. This is because the PCC temperature sensor or FCC temperature sensor operation is stopped by switching to PC cooling or FC cooling by preferentially switching to PC cooling or FC cooling even if it is off-cycle cooling as the temperature detected by the PCC temperature sensor or FCC temperature sensor rises. Time can be secured appropriately and temperature changes in the refrigerator compartment and the freezer compartment can be suppressed.

According to a third aspect of the present invention, the OFF temperature of the DFP temperature sensor that detects the end of the off-cycle cooling mode is set to a temperature that is higher than the ON temperature of the PCC temperature sensor that detects the start of the PC cooling mode. Therefore, the overcooling of the upper part of the refrigerator compartment due to off-cycle cooling can be suppressed, and the temperature change of the upper part of the refrigerator compartment can be suppressed. This suppresses the temperature change of the upper part of the refrigerator compartment by controlling off-cycle cooling while keeping the temperature of the DFP temperature sensor provided in the upper part of the refrigerator compartment having a relatively high temperature relatively higher than that of the PCC temperature sensor. It is something that can be done.

  According to a fourth aspect of the present invention, there is provided a compressor that is a component of a refrigeration cycle, an upper machine room that houses the compressor, and is disposed at an upper part of the refrigeration room, and is adjacent to the upper machine room and cools the refrigeration room. Since the refrigerator has a duct through which the cool air flows, the temperature of the cool air for cooling the refrigerating room can be increased, and temperature fluctuations in the upper part of the refrigerating room can be further suppressed. This is because a duct is formed on the wall of the refrigeration room adjacent to the upper machine room that is hotter than the outside air, thereby cooling the refrigeration room, especially the upper part of the refrigeration room, during off-cycle cooling and PC cooling. By raising the temperature of the cold air to be heated, overcooling of the upper part of the refrigerator compartment can be avoided and temperature fluctuations of the upper part of the refrigerator compartment can be further suppressed. In addition, since overcooling of the upper part of the refrigerator compartment can be avoided, it is possible to increase the amount of cool air that cools the refrigerator compartment during PC cooling, improving the heat exchange efficiency of the evaporator, and increasing the refrigeration cycle during PC cooling. Efficiency can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the same reference numerals are given to the same components as those of the conventional example, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a longitudinal sectional view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a cycle configuration diagram of the refrigerator according to Embodiment 1 of the present invention, and FIG. 3 is a temperature sensor behavior of the refrigerator according to Embodiment 1 of the present invention. FIG.

  In FIG. 1 and FIG. 2, the refrigerator 11 includes a housing 12, a door 13, legs 14 that support the housing 12, a lower machine room 15 provided in the lower portion of the housing 12, and an upper portion provided in the upper portion of the housing 12. It has a machine room 16, a refrigeration room 17 disposed at the upper part of the casing 12, and a freezing room 18 disposed at the lower part of the casing 12. In addition, as components constituting the refrigeration cycle, a compressor 19 housed in the upper machine room 16, an evaporator 20 housed in the back side of the freezer room 18, and a main condenser 21 housed in the lower machine room 15 are provided. Have. In addition, it has a partition wall 22 that partitions the lower machine chamber 15, a fan 23 that is attached to the partition wall 22 and cools the main condenser 21, an evaporating dish 24 installed on the leeward side of the partition wall 22, and a bottom plate 25 of the lower machine chamber 15. Yes.

  In addition, a plurality of air intakes 26 provided in the bottom plate 25, an exhaust port 27 provided on the back side of the lower machine room 15, and a communication air passage 28 connecting the exhaust port 27 of the lower machine room 15 and the upper machine room 16 are provided. doing. Here, the lower machine chamber 15 is divided into two chambers by a partition wall 22, and a main condenser 21 is housed on the windward side of the fan 23 and an evaporating dish 24 is housed on the leeward side.

  Further, as components constituting the refrigeration cycle, a dew-proof pipe 37 and a dew-proof pipe 37 which are located on the downstream side of the main condenser 21 and are thermally coupled to the outer surface of the housing 12 around the opening of the freezer compartment 18. It is located downstream, and has a dryer 38 that dries the circulating refrigerant, a throttle 38 that combines the dryer 38 and the evaporator 20 and depressurizes the circulating refrigerant.

In addition, an evaporator fan 30 that supplies cold air generated in the evaporator 20 to the refrigerator compartment 17 and the freezer compartment 18, a freezer damper 31 that blocks cold air supplied to the freezer compartment 18, and cold air supplied to the refrigerator compartment 17 The refrigerator compartment damper 32 to be shut off, the duct 33 for supplying cold air to the refrigerator compartment 17, the FCC temperature sensor 34 for detecting the temperature of the freezer compartment 18, the PCC temperature sensor 35 for detecting the temperature of the refrigerator compartment 17, the upper part of the refrigerator compartment 17, In particular, it has a DFP temperature sensor 36 that detects the temperature of the refrigerator compartment 17 above the PCC temperature sensor 35. Here, the duct 33 is formed along a wall surface where the refrigerator compartment 17 and the upper machine room 16 are adjacent to each other, and a part of the cold air passing through the duct 33 is discharged from the vicinity of the center of the refrigerator compartment, and most of the cold air is in the upper machine. After passing through the wall 16 while cooling the adjacent wall surface, it is discharged from the upper part of the refrigerator compartment 17.

  About the refrigerator in Embodiment 1 of this invention comprised as mentioned above, the operation | movement is demonstrated below.

  When the temperature detected by the DFP temperature sensor 36 rises to a predetermined ON temperature, the freezer compartment damper 31 is closed while the compressor 19 is stopped, the refrigerator compartment damper 32 is opened, and the evaporator fan 30 is driven. Thereby, the refrigerator compartment 17 is cooled using the evaporator 20 and the low-temperature sensible heat of the frost adhering to the evaporator 20 and the latent heat of fusion of the frost (hereinafter, this operation is referred to as “off-cycle cooling”). When the temperature detected by the DFP temperature sensor 36 falls to a predetermined OFF temperature, the freezer damper 31 is closed, the refrigerator compartment damper 32 is closed, and the evaporator fan 30 is stopped (hereinafter, this operation is referred to as “cooling”). Stopped)).

  When the temperature detected by the PCC temperature sensor 35 rises to a predetermined ON temperature during off-cycle cooling or cooling stop, the freezer damper 31 is closed, the refrigerator compartment damper 32 is opened, and the compressor 19 and the fan 23 are driven. To do. By driving the fan 23, the main condenser 21 side of the lower machine chamber 15 partitioned by the partition wall 22 has a negative pressure, and external air is sucked from the plurality of intake ports 26, and the evaporating dish 24 side has a positive pressure. The air is discharged from the plurality of discharge ports 27 to the outside. The air discharged from the lower machine room 15 is sent to the upper machine room 16 via the communication air passage 28 to cool the compressor 19.

  On the other hand, the refrigerant discharged from the compressor 19 is condensed while leaving a part of the gas while exchanging heat with the outside air in the main condenser 21 and then supplied to the dewproof pipe 37. The refrigerant that has passed through the dew-proof pipe 37 radiates heat through the housing 12 and condenses while warming the opening of the freezer compartment 18. The liquid refrigerant that has passed through the dew-proof pipe 37 is dehydrated by the dryer 38, depressurized by the throttle 39, and is evaporated by the evaporator 20, while exchanging heat with the air in the refrigerator compartment 17 and cooling the refrigerator compartment 17. Then, it returns to the compressor 19 as a gaseous refrigerant (hereinafter, this operation is referred to as “PC cooling”).

  Next, when the temperature detected by the PCC temperature sensor 35 falls to a predetermined OFF temperature or when the temperature detected by the FCC temperature sensor 34 rises to a predetermined ON temperature, the freezer damper 31 is opened and refrigerated. The chamber damper 32 is closed, and the compressor 19, the fan 23, and the evaporator fan 30 are driven. Thereafter, by operating the refrigeration cycle in the same manner as PC cooling, the freezer compartment 18 is cooled by exchanging heat between the inside air of the freezer compartment 18 and the evaporator 20 (hereinafter, this operation is referred to as “FC cooling”). Next, when the temperature detected by the FCC temperature sensor 34 falls to a predetermined OFF temperature, the cooling stop operation is performed.

  Note that off-cycle cooling operates in preference to cooling stop during cooling stop, and does not operate during PC cooling and FC cooling. In addition, PC cooling and FC cooling are operated with priority over off-cycle cooling. Further, the OFF temperature at which the off-cycle cooling is stopped is set higher than the ON temperature at which the PC cooling is started. As a result, during normal operation, the basic operation is to repeat a series of operations of PC cooling, FC cooling, and cooling stop in order, and while the PC cooling and FC cooling operations are not performed, the cooling stop and off-cycle cooling are performed several times. Repeat repeatedly.

  In FIG. 3, section a corresponds to PC cooling, section b corresponds to FC cooling, section c corresponds to off-cycle cooling, and section d corresponds to cooling stop operation. By this series of operations, the efficiency of the refrigeration cycle can be increased by keeping the temperature of the evaporator 20 at the time of PC cooling higher than that at the time of FC cooling, and the frost adhering to the evaporator 20 is melted by off-cycle cooling. By reusing latent heat, energy can be saved by reducing the capacity of the refrigeration cycle necessary for cooling the refrigerator compartment 17 while reducing heater power (not shown) during defrosting.

  Further, based on the DFP temperature sensor 36 provided in the upper part of the refrigerating chamber 17 having a relatively large temperature change, the off-cooling is performed several times while the PC cooling operation and the FC cooling operation are not performed. Since the ratio between the off-cycle cooling and the PC cooling for cooling 17 can be accurately adjusted, the PC cooling operation time can be appropriately ensured.

  In addition, as the detection temperature of the PCC temperature sensor 35 or the FCC temperature sensor 34 increases, even in the case of off-cycle cooling, this is stopped, and PC cooling or FC cooling is preferentially switched to PC cooling or FC cooling. An operation time can be ensured appropriately, and temperature changes in the refrigerator compartment 17 and the freezer compartment 18 can be suppressed.

  Further, by setting the OFF temperature at which the off-cycle cooling is stopped higher than the ON temperature at which the PC cooling is started, the temperature of the DFP temperature sensor 36 provided in the upper part of the refrigerating chamber 17 having a relatively high temperature is set as the PCC temperature sensor. By controlling the off-cycle cooling while keeping it relatively high, the temperature change in the upper part of the refrigerator compartment 17 can be suppressed. In the first embodiment, the OFF temperature for stopping off-cycle cooling is set higher than the ON temperature for starting PC cooling. However, the OFF temperature for stopping off-cycle cooling is set to OFF for stopping PC cooling. The same effect can be obtained even if the temperature is set higher than the temperature.

  Further, the duct 33 is formed on the wall surface of the refrigerating room 17 adjacent to the upper machine room 16 that is hotter than the outside air, thereby cooling the refrigerating room 17 during off-cycle cooling and PC cooling, particularly the refrigerating room 17. By raising the temperature of the cool air that cools the upper part of the refrigerator, it is possible to avoid overcooling of the upper part of the refrigerator compartment 17 and further suppress temperature fluctuations of the upper part of the refrigerator compartment 17, and Since cooling can be avoided, the amount of cool air that cools the refrigerator compartment 17 during PC cooling can be increased, and the efficiency of the heat exchange of the evaporator 20 can be improved to obtain higher refrigeration cycle efficiency during PC cooling. it can.

  As described above, the refrigerator of the present invention is a refrigerator having an off-cycle cooling mode (c) for cooling the refrigerator compartment 17 while the refrigeration cycle is stopped, in addition to the FC cooling mode (b) and the PC cooling mode (a). Independently of the control of the FC cooling mode (b) and the PC cooling mode (a), the DFP temperature sensor 36 is installed above the PCC temperature sensor 35 that controls the PC cooling and has a temperature change larger than that of the PCC temperature sensor 35. By controlling the off-cycle cooling mode (c) based on the detected temperature, it is possible to appropriately adjust the off-cycle cooling time to ensure sufficient PC cooling time, and to change the temperature of the refrigerator compartment 17 Can be suppressed.

  As described above, in the refrigerator according to the present invention, in addition to the FC cooling mode and the PC cooling mode, in the refrigerator having the off-cycle cooling mode for cooling the refrigerator compartment while the refrigeration cycle is stopped, the PC cooling operation time is appropriately set. As well as ensuring the temperature change of the refrigerator compartment, it can be applied to other refrigerator-freezer products such as commercial refrigerators.

DESCRIPTION OF SYMBOLS 11 Refrigerator 12 Case 15 Lower machine room 16 Upper machine room 19 Compressor 20 Evaporator 30 Evaporator fan 31 Freezer compartment damper 32 Refrigerating room damper 33 Duct 34 FCC temperature sensor 35 PCC temperature sensor 36 DFP temperature sensor

Claims (4)

Refrigeration room, freezing room, refrigeration cycle, evaporator as a component of the refrigeration cycle, evaporator fan for supplying cold air generated in the evaporator to the refrigeration room and the freezing room, and the evaporator A refrigeration room damper for blocking cold air supplied from the evaporator to the freezer room, a freezer damper for blocking cold air supplied from the evaporator to the freezer room, an FCC temperature sensor for detecting the temperature of the freezer room, In a refrigerator having a PCC temperature sensor that detects the temperature of the refrigerator compartment and a DFP temperature sensor that is installed above the PCC temperature sensor and detects the temperature of the upper portion of the refrigerator compartment, the freezer damper is opened, An FC cooling mode for closing the refrigerator compartment damper and supplying the cool air generated by the evaporator while operating the refrigeration cycle to cool the freezer compartment; and A damper is closed, the refrigerator compartment damper is opened, a PC cooling mode for cooling the refrigerator compartment by supplying cold air generated in the evaporator while operating the refrigeration cycle, and the refrigerator compartment damper is closed. And opening the refrigerator compartment damper and operating the evaporator fan while stopping the refrigeration cycle, thereby having an off-cycle cooling mode for exchanging heat between the evaporator and the air in the refrigerator compartment, Whether the FC cooling mode and the PC cooling mode are ON / OFF is determined based on the detected temperature of the FCC temperature sensor or the PCC temperature sensor, and the ON / OFF of the off-cycle cooling mode is determined based on the detected temperature of the DFP temperature sensor. A refrigerator characterized by determining OFF. The refrigerator according to claim 1, wherein when the temperature detected by the FCC temperature sensor or the PCC temperature sensor rises, the FC cooling mode and the PC cooling mode are prioritized over the off-cycle cooling mode. The OFF temperature of the DFP temperature sensor that detects the end of the off-cycle cooling mode is set to a temperature that is higher than the ON temperature of the PCC temperature sensor that detects the start of the PC cooling mode. refrigerator. A compressor that is a component of a refrigeration cycle, an upper machine room that houses the compressor, and that is disposed in the upper part of the refrigerating room, and a duct that is adjacent to the upper machine room and through which cool air that cools the refrigerating room flows. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator is provided.

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