JP6563273B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator provided with a low-temperature compartment in a refrigerator compartment.

  A conventional refrigerator is disclosed in Patent Document 1. This refrigerator includes a refrigerating room and a freezing room adjacent to the lower side of the refrigerating room through a heat insulating wall. The refrigerator compartment is partitioned, the refrigerator compartment is formed at the top, and the cold compartment (chilled chamber) having a temperature lower than that of the refrigerator compartment is formed at the bottom. First and second cold air passages are disposed on the back surfaces of the freezer compartment and the refrigerator compartment, respectively. The first cold air passage on the back surface of the freezer compartment has a first discharge port facing the freezer compartment, and a cooler connected to the compressor and a freezer compartment fan are arranged. The second cold air passage at the back of the refrigerator compartment communicates with the first cold air passage via a damper, and has a second outlet and a third outlet facing the refrigerator compartment and the low temperature compartment, respectively, and a refrigerator refrigerator is arranged. .

  When the freezer compartment exceeds the upper limit temperature, the compressor and the freezer compartment fan are driven, and the cool air generated by the cooler is discharged to the freezer compartment via the first discharge port. Thereby, when the freezer compartment is cooled and the freezer compartment is cooled to the lower limit temperature, the compressor and the freezer compartment fan are stopped.

  Further, when the refrigerator compartment exceeds the upper limit temperature while the compressor is being driven, the damper is opened, and the cold air generated by the cooler is discharged to the refrigerator compartment via the second discharge port and the third discharge port. As a result, the refrigerator compartment is cooled, and the damper is closed when the refrigerator compartment is cooled to the lower limit temperature. At this time, since the chilled chamber is close to the cooler, cold air having a temperature lower than that of the refrigerated compartment is discharged and cold heat from the adjacent freezer compartment is supplied. Thereby, the refrigeration section is maintained at the refrigeration temperature, and the chilled chamber in the low temperature section is maintained at a lower temperature than the refrigeration section.

Japanese Patent Laying-Open No. 2015-14442 (pages 5 to 15, FIG. 3)

  According to the conventional refrigerator, since the set temperature of the chilled room is constant, the stored items stored in the chilled room are limited. For this reason, the market request | requirement with respect to the refrigerator which provides the division which can be changed into several preset temperature and can use a storage space effectively is high.

  In response to such a demand, it is conceivable to provide a damper on the path of the cold air supplied to the chilled chamber to monitor the temperature of the chilled chamber and supply cold air to the chilled chamber independently of the refrigerated compartment. However, according to this configuration, there is a problem that the structure becomes complicated and the number of parts increases, which increases the cost of the refrigerator.

  An object of this invention is to provide the refrigerator which can change the preset temperature of the low-temperature division in a refrigerator compartment by simple structure, and can improve the convenience.

  In order to achieve the above object, the present invention includes a refrigeration compartment for storing stored refrigerated and a cold compartment having a temperature lower than that of the refrigeration compartment, the cold compartment disposed at the bottom, and the refrigeration compartment. A freezer compartment for storing stored frozen adjacent to the lower part, a compressor for operating a refrigeration cycle, a cooler connected to the compressor to generate cool air, and the cooler are arranged and the freezer compartment A first cold air passage having a first discharge port facing the first cold air passage, a second cold air passage having a second discharge port communicating with the first cold air passage through a damper and facing the refrigeration compartment, and a second cold air passage. A third cold air passage having a third outlet facing the low temperature compartment, a first blower arranged in the first cold air passage, and a second air arranged in the third cold air passage with the intake side facing the low temperature compartment. And when the damper is opened or the damper is closed It is characterized in that the variable according to the driving state of the second blower to the set temperature of the low temperature compartment.

  According to this configuration, when the compressor and the first blower are driven, the cold air generated by the cooler flows through the first cold air passage and is discharged from the first discharge port to the freezer compartment. When the damper is opened, the cold air flowing through the second cold air passage and the third cold air passage is discharged from the second discharge port and the third discharge port to the refrigeration compartment and the low temperature compartment, respectively. At this time, when the second blower is driven, the inflow of cold air from the third cold air passage to the low temperature section is suppressed. Further, when the second blower is driven when the damper is closed, the cold air in the low temperature section flows out from the third discharge port and is discharged from the second discharge port to the refrigeration section, and flows through the refrigeration section to the low temperature section. Return.

  In the refrigerator having the above-described configuration, the first cooling mode of driving the second fan with a predetermined air volume when the damper is closed and driving the second fan with an air volume lower than the predetermined air volume when the damper is opened. And a second cooling mode in which the second fan is driven with an air volume lower than the predetermined air volume when the damper is closed and the second fan is driven or stopped with an air volume lower than the predetermined air volume when the damper is opened. It is characterized by having prepared.

  Further, the present invention is characterized in that the refrigerator having the above-described configuration includes a third cooling mode in which the second blower is stopped when the damper is closed and opened.

  In the refrigerator having the above-described configuration, the second blower is stopped when the damper is closed in the first cooling mode, and the second blower is switched to the predetermined air volume after a predetermined delay period has elapsed. Yes.

  According to the present invention, in the refrigerator configured as described above, the second blower is stopped when the damper is closed in the second cooling mode, and the second blower is driven with the predetermined air volume after a predetermined delay period has elapsed. It is characterized by switching to an air volume lower than the predetermined air volume after the passage.

  In the refrigerator configured as described above, the delay period is from when the damper is closed to when the refrigerated compartment is heated to a predetermined temperature lower than a temperature at which the damper is opened.

  According to the present invention, in the refrigerator configured as described above, the state in which the damper is opened during the first cooling mode and the second cooling mode continues for a predetermined time, and the refrigeration compartment is higher than the predetermined temperature higher than the temperature at which the damper is closed. When the temperature is low, the damper is closed for a predetermined time to drive the second blower.

  According to the present invention, when the second blower is disposed in the third air passage having the third discharge port that branches from the second cold air passage and faces the low temperature compartment with the intake side facing the low temperature compartment and the damper is opened or The driving state of the second blower when the damper is closed is varied according to the set temperature of the low temperature section. Thereby, the low temperature section can be switched to a plurality of set temperatures with a simple configuration, and the convenience of the refrigerator can be improved.

Front sectional drawing which shows the refrigerator of 1st Embodiment of this invention. Side surface sectional drawing which shows the refrigerator of 1st Embodiment of this invention. The block diagram which shows the structure of the refrigerator of 1st Embodiment of this invention. The time chart which shows operation | movement of the 1st cooling mode of the refrigerator of 1st Embodiment of this invention. The time chart which shows operation | movement of the 2nd cooling mode of the refrigerator of 1st Embodiment of this invention. The time chart which shows operation | movement of the 3rd cooling mode of the refrigerator of 1st Embodiment of this invention. The time chart which shows operation | movement of the 1st cooling mode of the refrigerator of 2nd Embodiment of this invention. The time chart which shows operation | movement of the 2nd cooling mode of the refrigerator of 2nd Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side sectional view showing the refrigerator of the first embodiment. The refrigerator 1 is provided with a refrigerator compartment 3, a freezer compartment 4, and a vegetable compartment 5 in order from above the heat insulating box 2. The refrigerator compartment 3 and the freezer compartment 4 are partitioned by a heat insulating wall 17, and the freezer compartment 4 and the vegetable compartment 5 are partitioned by a heat insulating wall 18.

  The refrigerator compartment 3 is opened and closed by a pivoting door 3a pivotally supported at one end, and a plurality of placement shelves 3b on which stored items are placed are arranged in the refrigerator compartment 3. The lower part of the lowermost mounting shelf 3b is divided into left and right by a vertical partition wall 3c. On one side partitioned by the vertical partition wall 3c, a low-temperature section 22 whose front surface is covered by a cover 22a is formed. As a result, the inside of the refrigerator compartment 3 is divided into a refrigerator compartment 21 for storing stored items in a refrigerator, and a cold compartment 22 that is disposed at the bottom of the refrigerator compartment 3 and maintained at a lower temperature than the refrigerator compartment 21.

  The freezer compartment 4 is opened and closed by a drawer-type door 4a formed integrally with the storage case 4b, and stores stored items in a frozen state. The vegetable compartment 5 is opened and closed by a drawer-type door 5a formed integrally with the storage case 5b, and is stored at a temperature higher than that of the refrigerator compartment 3 to store stored items such as vegetables in a refrigerator.

  A cold air passage 7 (first cold air passage) and a cold air passage 8 (second cold air passage) communicating with each other via a damper 15 are provided on the rear surfaces of the freezer compartment 4 and the refrigerator compartment 3. A cooler 11 and a freezer compartment fan 12 (first fan) are arranged in the cold air passage 7, and a discharge port 7 a (first discharge port) facing the freezer chamber 4 is opened. A discharge port 8 a (second discharge port) that faces the refrigeration section 21 is opened above the cold air passage 8.

  Further, a cold air passage 9 having a discharge port 9 a (third discharge port) facing the low temperature section 22 is provided to be branched from the cold air passage 8. A refrigerator compartment fan 13 (second fan) is disposed in the cold air passage 9. The refrigerator compartment blower 13 is disposed facing the discharge port 9a with the intake side facing the low temperature section 22.

  The freezing chamber 4 is provided with a return port 7 b that returns the cool air to the cool air passage 7 so as to face the cooler 11. In the refrigerator compartment 3, a communication passage 10 communicating with the vegetable compartment 5 is led out through the outlet 10 a, and a discharge port 10 b facing the vegetable compartment 5 is formed at one end of the communication passage 10. The vegetable compartment 5 is provided with a return port (not shown) for returning cold air to the cold air passage 7.

  A machine room 6 is provided behind the vegetable room 5, and a compressor 16 for operating a refrigeration cycle is installed in the machine room 6. A condenser (not shown), a capillary tube (not shown), and a cooler 11 are sequentially connected to the compressor 16 via a refrigerant pipe (not shown) through which the refrigerant flows, and the compressor 16 returns to the compressor 16. As a result, the refrigeration cycle is operated, and the cooler 11 exchanges heat with the air flowing through the cold air passage 7 to generate cold air.

  When the damper 15 is closed and the compressor 16 and the freezer compartment fan 12 are driven, the cold air flowing through the cold air passage 7 is discharged into the freezer compartment 4 through the discharge port 7a as shown by an arrow A1. As a result, the freezer compartment 4 is cooled, and the cold air flowing through the freezer compartment 4 returns to the cold air passage 7 via the return port 7b.

  When the damper 15 is opened while the compressor 16 and the freezer compartment fan 12 are being driven, cold air flows from the cold air passage 7 into the cold air passage 8. In the state where the refrigerator compartment fan 13 is stopped, the cold air flowing through the cold air passage 8 is discharged to the refrigerator compartment 21 through the discharge port 8a as shown by an arrow A2. Further, as shown by the arrow A3, the cold air flowing through the cold air passage 9 is discharged to the low temperature section 22 through the discharge port 9a. Thereby, the refrigerator compartment 3 is cooled.

  The cold air that has circulated through the refrigerator compartment 3 is guided to the vegetable compartment 5 through the communication passage 10, and the vegetable compartment 5 is cooled. The cold air flowing through the vegetable compartment 5 returns to the cold air passage 7 through the return port. At this time, when the refrigerator compartment fan 13 is driven, the inflow of cold air from the cold air passage 9 to the low temperature section 22 is suppressed.

  Further, when the damper 15 is closed and the refrigerator compartment fan 13 is driven, cold air flows out from the low temperature section 22 through the discharge port 9a as indicated by an arrow A4. The cold air flowing out from the low temperature compartment 22 is discharged from the discharge port 8a to the refrigeration compartment 21, flows through the refrigeration compartment 21, and returns to the low temperature compartment 22 through the gap between the cover 22a and the wall surface. Thereby, cold air circulates in the refrigerator compartment 3.

  FIG. 3 is a block diagram showing the configuration of the refrigerator 1. The refrigerator 1 has a control unit 30 that controls each unit. The control unit 30 is connected to the compressor 16, the freezer compartment fan 12, the refrigerator compartment fan 13, the damper 15, the operation panel 31, the freezer compartment temperature sensor 32, the refrigerator compartment temperature sensor 33, and the storage unit 34.

  The operation panel 31 is arranged on the front surface of the door 3a and performs setting operations such as each cooling mode described later. The freezer compartment temperature sensor 32 detects the temperature of the freezer compartment 4, and the refrigerator compartment temperature sensor 33 detects the temperature of the refrigerator compartment 21 of the refrigerator compartment 3. The storage unit 34 includes a RAM and a ROM, and stores an operation program of the refrigerator 1 and temporarily stores calculations by the control unit 30.

  The operation program of the refrigerator 1 is provided with a first cooling mode, a second cooling mode, and a third cooling mode that have different set temperatures of the low-temperature compartment 22. The first cooling mode is a set temperature higher than the freezing point (2 ° C. in the present embodiment), and is a temperature in the vicinity of the set temperature of the refrigeration section 21 (3 ° C. in the present embodiment).

  In the second cooling mode, the temperature is lower than the first cooling mode (−1 ° C. in the present embodiment) near the freezing point such as the chilled temperature zone and the ice temperature temperature zone. The third cooling mode is a set temperature (−5 ° C. in this embodiment) that is lower than that of the second cooling mode. By switching each cooling mode according to the stored item by operating the operation panel 31, it is possible to store the stored item having different preservation temperatures in the low temperature section 22 at a temperature corresponding to the stored item.

  4A to 4F are time charts showing an example of the operation in the first cooling mode. The vertical axis | shaft of Fig.4 (a) has shown the temperature of the refrigerator compartment 3. FIG. In the figure, A is the temperature of the refrigerated compartment 21 and B is the temperature of the cold compartment 22. The vertical axis in FIG. 4B indicates the temperature of the freezer compartment 4. The vertical axis in FIG. 4C indicates the on state and the off state of the compressor 16. The vertical axis | shaft of FIG.4 (d) has shown the rotation speed of the freezer compartment fan 12. FIG. The vertical axis in FIG. 4 (e) indicates the open state and the closed state of the damper 15. The vertical axis | shaft of FIG.4 (f) has shown the rotation speed of the refrigerator compartment fan 13. FIG.

  In the first cooling mode, when the compressor 16 is stopped and the damper 15 is closed, the refrigerator compartment fan 13 is driven at a predetermined rotational speed N2. Thereby, cold air flows out from the low temperature compartment 22 through the discharge port 9a (arrow A4 in FIG. 1), and the cold air flowing out from the low temperature compartment 22 is discharged from the discharge port 8a to the refrigeration compartment 21 and circulates in the refrigerator compartment 3. To do.

  When the freezer compartment 4 becomes hotter than the predetermined upper limit temperature Tf2 at time t1, the compressor 16 is driven and the freezer compartment fan 12 is driven at a predetermined rotational speed Na. At this time, as shown in the figure, when the refrigeration section 21 is hotter than the predetermined upper limit temperature Tr2, the damper 15 is opened. When the refrigerator compartment 21 is lower than the upper limit temperature Tr2, the damper 15 is kept closed, and when the temperature is higher than the upper limit temperature Tr2, the damper 15 is opened. When the damper 15 is opened, the refrigerator compartment fan 13 is driven at a rotational speed N1 lower than the rotational speed N2.

  Thereby, the cold air which distribute | circulates the cold air | gas channel | path 7 is discharged to the freezer compartment 4 via the discharge outlet 7a, and the freezer compartment 4 is cooled. The cold air flowing through the cold air passage 8 is discharged to the refrigerating section 21 through the discharge port 8a, and the refrigerating room 3 and the vegetable room 5 are cooled.

  Further, since the suction force acts on the low temperature section 22 through the discharge port 9a by driving the refrigerator compartment fan 13, the inflow of cold air from the cold air passage 9 to the low temperature section 22 is suppressed. If the rotational speed N1 is too large, the cool air flows backward in the cool air passage 9, and the cool air from the cooler 11 is not supplied to the discharge port 8a. For this reason, in this embodiment, when the refrigerating room blower 13 is at the rotation speed N1, almost no inflow of cool air into the low temperature section 22 occurs, and the cool air passage 9 does not flow backward.

  When the refrigeration section 21 reaches a predetermined lower limit temperature Tr1 at time t2, the damper 15 is closed and the refrigeration room blower 13 is switched to the rotation speed N2. When the freezer compartment 4 reaches a predetermined lower limit temperature Tf1 at time t3, the compressor 16 and the freezer compartment fan 12 are stopped.

  When the damper 15 is closed, the refrigerating room blower 13 is driven at the rotation speed N2 so that the cold air circulates in the refrigerating room 3. At this time, the cold compartment 22 is supplied with cold heat from the adjacent freezer compartment 4, and thus is colder than the refrigerator compartment 21.

  FIGS. 5A to 5F are time charts showing an example of the operation in the second cooling mode. Similar to FIG. 4 described above, the vertical axis of FIG. 5A indicates the temperature of the refrigerator compartment 3. In the figure, A is the temperature of the refrigerated compartment 21 and B is the temperature of the cold compartment 22. The vertical axis in FIG. 5B indicates the temperature of the freezer compartment 4. The vertical axis in FIG. 5C indicates the on state and the off state of the compressor 16. The vertical axis | shaft of FIG.5 (d) has shown the rotation speed of the freezer compartment fan 12. FIG. The vertical axis in FIG. 5 (e) indicates the open state and the closed state of the damper 15. The vertical axis | shaft of FIG.5 (f) has shown the rotation speed of the refrigerator compartment fan 13. FIG.

  In the second cooling mode, when the compressor 16 is stopped and the damper 15 is closed, the refrigerating room blower 13 is driven at a rotational speed N1 lower than the rotational speed N2.

  When the freezer compartment 4 becomes higher than the upper limit temperature Tf2 at time t1 as in the first cooling mode, the compressor 16 is driven and the freezer blower 12 is driven at the rotation speed Na. At this time, if the refrigerated compartment 21 is hotter than the upper limit temperature Tr2, the damper 15 is opened. When the damper 15 is opened, the refrigerator compartment fan 13 is driven while maintaining the rotation speed N1.

  Thereby, the cold air which distribute | circulates the cold air | gas channel | path 7 is discharged to the freezer compartment 4 via the discharge outlet 7a, and the freezer compartment 4 is cooled. The cold air flowing through the cold air passage 8 is discharged to the refrigerating section 21 through the discharge port 8a, and the refrigerating room 3 and the vegetable room 5 are cooled. Moreover, since the refrigerator compartment fan 13 is driven at the rotation speed N1, the inflow of cold air from the cold air passage 9 to the low temperature section 22 is suppressed.

  When the refrigeration section 21 reaches the lower limit temperature Tr1 at time t2, the damper 15 is closed. When the freezer compartment 4 reaches the lower limit temperature Tf1 at time t3, the compressor 16 and the freezer compartment blower 12 are stopped.

  Since the low-temperature compartment 22 is arranged at the bottom of the refrigerator compartment 3, cool air of relatively low temperature flows from the front due to the weight of the cold air, and cold heat of the adjacent freezer compartment 4 is supplied. Further, when the damper 15 is closed, the refrigerator compartment fan 13 is driven at a low speed (the number of revolutions N1), so that the cool air circulates gently in the refrigerator compartment 3. For this reason, the temperature rise of the low temperature section 22 is suppressed, and the low temperature section 22 is maintained at a lower temperature than in the first cooling mode.

  In order to maintain the low temperature section 22 at a lower temperature in the second cooling mode, the refrigerating room blower 13 may be stopped (rotation number = 0) when the damper 15 is closed.

  The rotation speed N1 of the refrigerator compartment fan 13 in the first cooling mode may be different from the rotation speed N1 of the refrigerator compartment fan 13 in the second cooling mode. Moreover, although the rotation speed of the refrigerator compartment fan 13 is varied, the air volume of the refrigerator compartment fan 13 may be varied, and the DUTY ratio may be varied at a constant revolution number.

  6A to 6F are time charts showing an example of the operation in the third cooling mode. Similar to FIG. 4 described above, the vertical axis of FIG. 6A indicates the temperature of the refrigeration compartment 21 of the refrigerator compartment 3. The vertical axis of FIG. 6B indicates the temperature of the freezer compartment 4. The vertical axis in FIG. 6C indicates the on state and the off state of the compressor 16. The vertical axis | shaft of FIG.6 (d) has shown the rotation speed of the freezer compartment fan 12. FIG. The vertical axis in FIG. 6 (e) shows the open state and the closed state of the damper 15. The vertical axis | shaft of FIG.6 (f) has shown the rotation speed of the refrigerator compartment fan 13. FIG.

  In the third cooling mode, the refrigerator 16 is stopped when the compressor 16 is stopped and the damper 15 is closed.

  When the freezer compartment 4 becomes higher than the upper limit temperature Tf2 at time t1, the compressor 16 is driven and the freezer compartment fan 12 is driven at the rotation speed Na. At this time, as shown in the figure, when the refrigeration section 21 has a temperature higher than the upper limit temperature Tr2, the damper 15 is opened. When the damper 15 is opened, the refrigerator compartment fan 13 continues to be stopped.

  Thereby, the cold air which distribute | circulates the cold air | gas channel | path 7 is discharged to the freezer compartment 4 via the discharge outlet 7a, and the freezer compartment 4 is cooled. Moreover, the cold air which distribute | circulates the cold air | gas channel | paths 8 and 9 is discharged to the refrigerator compartment 3 via the discharge outlets 8a and 9a, and the refrigerator compartment 3 and the vegetable compartment 5 are cooled.

  At this time, since the low temperature section 22 is close to the cooler 11, cold air having a temperature lower than that of the refrigerated section 21 is discharged. Further, since the low temperature compartment 22 is arranged at the bottom of the refrigerator compartment 3, low temperature cold air flows in from the front due to the weight of the cold air, and the cold heat of the adjacent freezer compartment 4 is supplied. Thereby, the low temperature section 22 is maintained at a temperature lower than the freezing point and lower than the second cooling mode.

  When the refrigeration section 21 reaches the lower limit temperature Tr1 at time t2, the damper 15 is closed. When the freezer compartment 4 reaches the lower limit temperature Tf1 at time t3, the compressor 16 and the freezer compartment blower 12 are stopped.

  According to this embodiment, the cold air passage 7 (first cold air passage) and the cold air passage 8 (second cold air passage) communicate with each other via the damper 15, and the discharge port 7 a (first discharge port) facing the freezer compartment 4, and Discharge ports 8a (second discharge ports) facing the refrigerated compartment 21 are provided in the cold air passages 7 and 8, respectively. The cold air passage 9 (third cold air passage) branched from the cold air passage 8 is provided with a discharge port 9a (third discharge port) facing the low-temperature compartment 22, and the refrigerator compartment blower 13 (second blower) has a low-temperature compartment on the intake side. It is arranged toward 22.

  The first cooling mode and the second cooling mode differ in the driving state of the refrigerator compartment blower 13 when the damper 15 is closed. When the damper 15 is closed in the second cooling mode and the refrigerator compartment fan 13 is stopped, the driving state of the first cooling mode and the refrigerator compartment fan 13 are different. The driving state of the refrigerator compartment fan 13 when the damper 15 is closed and when the damper 15 is opened differs between the first cooling mode or the second cooling mode and the third cooling mode.

  Therefore, the driving state of the refrigerator compartment fan 13 when the damper 15 is closed or opened is varied according to the set temperature of the low temperature section 22. Thereby, the low temperature compartment 22 can be switched to a plurality of set temperatures with a simple configuration, and the storage space can be used effectively, so the convenience of the refrigerator 1 can be improved.

  In the first cooling mode, when the damper 15 is closed, the refrigerator compartment fan 13 is driven with a predetermined air volume (rotation speed N2), and when the damper 15 is opened, the refrigerator compartment fan 13 is operated with an air volume lower than the predetermined air volume ( It is driven at the rotational speed N1). In the second cooling mode, when the damper 15 is closed, the refrigerating room blower 13 is driven or stopped at an air volume (rotation speed N1) lower than the predetermined air volume. In the third cooling mode, the refrigerator fan 13 is stopped when the damper 15 is closed and opened. For this reason, the temperature of the low temperature section 22 can be easily changed by the first cooling mode, the second cooling mode, and the third cooling mode.

Second Embodiment
Next, a second embodiment will be described. This embodiment differs from the first embodiment in the operations of the first cooling mode and the second cooling mode. Other parts are the same as those of the first embodiment.

  FIG. 7A and FIG. 7B are time charts showing an example of the operation in the first cooling mode of the present embodiment. FIG. 8A and FIG. 8B are time charts showing an example of the operation in the second cooling mode of the present embodiment. The vertical axes in FIGS. 7A and 8A indicate the open state and the closed state of the damper 15. The vertical axis | shaft of FIG.7 (b) and FIG.8 (b) has shown the rotation speed of the refrigerator compartment fan 13. FIG. The operations of the compressor 16 and the freezer compartment fan 12 are the same as those shown in FIGS.

  In the first cooling mode and the second cooling mode, the temperature of the refrigerating chamber 3 becomes lower than a predetermined temperature, and the refrigerating section 21 may be cooler than the low-temperature section 22 immediately after the damper 15 is closed. At this time, when the refrigerator compartment fan 13 is driven, the cold compartment 22 is supercooled because the cold compartment 21 is at a low temperature.

  For this reason, in the first cooling mode, when the damper 15 is closed at time t2, the refrigerator compartment fan 13 is temporarily stopped and the refrigerator compartment fan 13 is driven at the rotation speed N2 after a predetermined delay period Ta has elapsed.

  In the second cooling mode, when the damper 15 is closed at time t2, the refrigerating room blower 13 is temporarily stopped and the refrigerating room blower 13 is driven at the rotation speed N2 after a predetermined delay period Ta has elapsed. And after predetermined time passes, the refrigerator compartment air blower 13 is driven with the rotation speed N1.

  Thereby, the cold air which warmed the inside of the refrigerator compartment 3 circulates, the bottom part of the refrigerator compartment 3 is heated up, and the overcooling of the low temperature division 22 can be prevented. The refrigerator fan 13 may be driven at a low rotation speed (rotation speed N1) during the delay period Ta in the second cooling mode, but the bottom of the refrigerator compartment 3 can be quickly moved at a high rotation speed (rotation speed N2). It is more desirable because it can raise the temperature.

  In this embodiment, the delay period Ta is set to a predetermined time. The delay period Ta may be from when the damper 15 is closed until the refrigerated compartment 21 is heated to a predetermined temperature lower than the upper limit temperature Tr2 (temperature at which the damper 15 is opened). Thereby, the high-speed rotation of the refrigerator compartment fan 13 in the period which cannot heat up the low temperature division 22 can be prevented more reliably.

<Third Embodiment>
Next, a third embodiment will be described. This embodiment differs from the first embodiment in the operations of the first cooling mode and the second cooling mode. Other parts are the same as those of the first embodiment.

  In the first cooling mode and the second cooling mode, when a high-temperature stored item is thrown in, the state where the damper 15 is opened and the cold air is supplied into the refrigerator compartment 3 continues for a long time. As a result, the low-temperature section 22 restricted from entering the cold air is supercooled to a desired temperature by the cold heat of the low-temperature cold air flowing through the lower part of the cold air passage 8.

  Therefore, when the damper 15 is kept open for a predetermined time (for example, 50 minutes) and the refrigeration section 21 is lower than the predetermined forced circulation temperature, the damper 15 is closed for a predetermined time (for example, 10 minutes). The refrigerator compartment fan 13 is driven at a high speed (rotation speed N2). The forced circulation temperature is set to be higher than the lower limit temperature Tr1 (temperature at which the damper 15 is closed) of the refrigerator compartment 3. Thereby, the cold air circulates in the refrigerator compartment 3 to raise the temperature of the low temperature section 22, and overcooling of the low temperature section 22 can be prevented.

  If the refrigerated compartment 21 is hotter than the forced circulation temperature, it is considered that there is room before the low-temperature compartment 22 becomes supercooled. For this reason, the state which opened the damper 15 is continued, and the inside of the refrigerator compartment 3 is cooled rapidly.

  Although the refrigerator fan 13 may be driven at a low rotation speed (rotation speed N1), it is more desirable to increase the rotation speed at a high speed because the low-temperature compartment 22 can be quickly heated.

  According to this invention, it can utilize for the refrigerator which provided the low temperature division in the refrigerator compartment.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Heat insulation box 3 Refrigerating room 3a, 4a, 5a Door 3b Mounting shelf 3c Vertical partition wall 4 Freezing room 4b, 5b Storage case 5 Vegetable room 6 Machine room 7, 8, 9 Cold air passage 7a, 8a, 9a, DESCRIPTION OF SYMBOLS 10b Discharge port 7b Return port 10 Communication path 10a Outlet 11 Cooler 12 Freezer compartment blower 13 Refrigerator compartment blower 15 Damper 16 Compressor 17, 18 Heat insulation wall 21 Refrigeration compartment 22 Low temperature compartment 30 Control part 31 Operation panel 32 Freezer compartment temperature sensor 33 Cold room temperature sensor 34 Storage unit

Claims (5)

A refrigerated compartment for refrigerated storage and a cold compartment having a temperature lower than that of the refrigerated compartment, the cold compartment disposed at the bottom, and the stock stored in a refrigerator adjacent to the lower part of the refrigerator compartment. A first cold air having a freezer compartment, a compressor operating a refrigeration cycle, a cooler connected to the compressor to generate cold air, and a first discharge port facing the freezer compartment, the cooler being disposed. and the passage is opened and closed is provided between the second cold air passage having a second discharge port facing the refrigerating compartment communicates with the first cold air passage, and the first cold air passage and the second cool air passage a damper, and a third cold air passage having a third discharge port facing the low temperature zone is branched from the second cold air passage, a first blower disposed in the first cold air passage, the said third cool air passage and a second blower disposed an intake side toward Ke third discharge port, Refrigerator, characterized in that the variable according to driving states of the second blower when closed or the damper when opened serial damper to the set temperature of the low temperature compartment. A refrigerated compartment for refrigerated storage and a cold compartment having a temperature lower than that of the refrigerated compartment, the cold compartment disposed at the bottom, and the stock stored in a refrigerator adjacent to the lower part of the refrigerator compartment. A first cold air having a freezer compartment, a compressor operating a refrigeration cycle, a cooler connected to the compressor to generate cold air, and a first discharge port facing the freezer compartment, the cooler being disposed. A second cold air passage having a second discharge port that communicates with the first cold air passage through the damper and faces the refrigeration compartment; and a third discharge that branches from the second cold air passage and faces the low temperature compartment A third cold air passage having an outlet; a first blower disposed in the first cold air passage; and a second blower disposed in the third cold air passage with an intake side directed toward the low-temperature compartment, the damper The second blower when the fan is opened or the damper is closed Variable and in accordance with the driving state to the set temperature of the low temperature compartment,
A first cooling mode in which the driven at a low air volume than the predetermined air volume of the second blower when opening to drive at a predetermined air volume of the second blower when closing the damper, when closing said damper you characterized in that a second cooling mode in which the driving or stopping the second fan at a low air volume than the predetermined air volume of the second blower when opening to drive at a low air volume than the predetermined air volume refrigerators. The refrigerator according to claim 2, characterized in that switching to the predetermined air volume of the second blower after the second blower is stopped, the predetermined delay period has elapsed when closing the damper in the first cooling mode . The second blower is stopped when closing the damper to the second cooling mode, and driven by the predetermined air volume of the second blower after a predetermined delay period has elapsed, the lower than the predetermined air volume after a predetermined time has elapsed The refrigerator according to claim 2 or 3, wherein the refrigerator is switched to an air volume. If the state of opening the damper to the first cooling mode and the second cooling mode is the refrigerating compartment than the predetermined temperature of the hot against it closes the damper temperature continues for a predetermined time is low, the damper The refrigerator according to claim 2 or 3, wherein the second blower is driven after being closed for a predetermined time.

Images