JP6134610B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator.

  As a background art in this technical field, there is JP 2012-26677 A (Patent Document 1). The refrigerator described in Patent Literature 1 includes a back side blowout air passage that blows out cold air from the back side of the refrigerator compartment, and a ceiling side blowout air passage that blows out cold air from the ceiling surface side of the refrigerator compartment, and a refrigerator in the back side of the refrigerator compartment Based on the values of the back side temperature sensor that detects the inside temperature and the ceiling side temperature sensor that detects the inside temperature of the ceiling side and the front part of the refrigerator compartment, the air is blown to the back side air duct and the ceiling side air duct. The amount of cold air is controlled by an air volume adjustment device (twin duct damper).

JP 2012-26677 A

  However, in the case of cooling while switching the two cold air passages and suppressing the temperature distribution of the entire refrigerator compartment, the following points are problematic in the refrigerator described in Patent Document 1.

  For the purpose of suppressing the temperature distribution in the refrigerator compartment, the temperature detected by the ceiling side temperature sensor is, for example, 10 ° C. or more, and the difference between the temperatures detected by the ceiling side temperature sensor and the back side temperature sensor is, for example, 8 ° C. or more. In this case, it is determined that the temperature distribution in the refrigerator compartment is large, and the refrigerator compartment is cooled by blowing cool air using the ceiling side blowing air passage. Here, when food with a high temperature is stored near the ceiling temperature sensor, or when many foods are stored at once (for example, assuming that food is placed on the top shelf in the refrigerator compartment), the ceiling temperature sensor Therefore, it takes a long time for the temperature detected by the ceiling side temperature sensor to drop to a predetermined temperature.

  In addition, the cold air blown out by the back side blowing air passage is performed until the temperature detected by the back side temperature sensor of the refrigerating room reaches a predetermined temperature. On top of this, when food with a high temperature or many foods are placed at once, the time until the temperature detected by the back side temperature sensor decreases to a predetermined temperature becomes longer. During this time, the refrigerator compartment continues to be cooled by the cold air discharged from the ceiling side blowing air passage and the back side blowing air passage.

  As described above, in the refrigerator described in Patent Document 1, the opening / closing control of the twin duct damper connected to the ceiling side blowing air passage and the back side blowing air passage is detected by the ceiling side temperature sensor and the back side temperature sensor. Cooling is performed based on temperature to eliminate the temperature distribution in the refrigerator compartment. However, freezing of water in the ice making water tank or excessive cooling of food in the storage case provided in the area through which the cold air discharged from the ceiling side blowing air passage and the back side blowing air passage of the refrigerator compartment passes. No consideration is given to freezing. Moreover, in order to avoid freezing, it is necessary to heat with an electric heater so that it may be kept at a predetermined temperature or higher, and the temperature influence on the quality of the food is large, and the energy saving performance is reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigerator that suppresses over-cooling in the storage chamber, has high energy-saving performance, and has improved food storage stability. .

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. To give an example, at least one of a storage room in a refrigerated temperature zone, a plurality of shelves in the storage room, and a space between the plurality of shelves. First cold air duct and second cold air duct for supplying cold air, first air blowing means for blowing cold air to each of the first cold air duct and the second cold air duct, and the second air duct A second air blowing means in the cold air duct, a first air volume adjusting device that controls the air blowing of the first cold air duct, a second air volume adjusting device that controls the air blowing of the second cold air duct, and The second cold air between the first cold air duct and the first region to which the cold air is supplied from the second cold air duct, and the uppermost shelf in the storage chamber and the upper wall of the storage chamber. A second region in which cold air is supplied from the duct, and the uppermost stage in the storage chamber And a first area of the second cold air duct, a first cold air circulation section provided in the first area of the second cold air duct, and a third area where the cold air is supplied from the first cold air duct The second cold air circulation part provided in the second region of the second cold air duct, the cold air return part of the first region, the first temperature detecting means of the first region, the first A second temperature detecting means in a second region.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator which suppressed the excessive cooling in the storage chamber, has high energy-saving performance, and improved the preservability of foodstuffs can be provided.

It is a front view of the refrigerator which concerns on embodiment of this invention. It is a front view of the state which removed the door of the refrigerator compartment which concerns on embodiment of this invention. It is BB sectional drawing of FIG. 2, Comprising: It is sectional drawing of the 1st cold air duct 11a. It is CC sectional drawing of FIG. 2, Comprising: It is sectional drawing of the 2nd cold air duct 11b. It is DD sectional drawing of FIG. This is a flow of cold air when the refrigerator compartment 2 is cooled by the first cold air duct 11a. It is EE sectional drawing of FIG. 6a. This is a flow of cold air when the refrigerator compartment 2 is cooled by the second cold air duct 11b. It is FF sectional drawing of FIG. It is the front view in the refrigerator compartment which showed the flow of the cold air at the time of cooling the refrigerator compartment 2 using the 1st cold air duct 11a and the 2nd cold air duct 11b simultaneously. It is the figure which match | combined and displayed the side cross section of each duct of the 1st cold air duct 11a and the 2nd cold air duct 11b. It is a temperature chart at the time of the cooling operation of the refrigerator compartment which concerns on embodiment of this invention. It is the front view in the refrigerator compartment which showed the mode of the cold air circulation in the refrigerator compartment 2 by the 2nd cold air duct 11b. It is CG-G sectional drawing of FIG. 10a. It is a temperature chart of other control at the time of cooling operation of the refrigerator compartment which concerns on embodiment of this invention. It is a temperature chart of other control at the time of cooling operation of the refrigerator compartment which concerns on embodiment of this invention. It is a temperature chart of other control at the time of cooling operation of the refrigerator compartment which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention. As shown in FIG. 1, the refrigerator 1 of this embodiment is comprised from the refrigerator compartment 2, the freezer compartment 7, and the vegetable compartment 6 from upper direction. The freezer compartment 7 includes a lower freezer compartment 5, ice making rooms 3 provided on the left and right above the lower freezer compartment 5, and an upper freezer compartment 4.

  The refrigerating room 2 includes rotary refrigerating room doors 2a and 2b divided into left and right, and the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are a pull-out ice making room door 3a and an upper stage, respectively. A freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a are provided. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a may be simply referred to as doors 2a, 2b, 3a, 4a, 5a, and 6a. is there. In order to fix the refrigerator 1 and the refrigerator compartment doors 2 a and 2 b, door hinges are provided at the upper and lower portions of the refrigerator compartment 2, and the upper door hinges are covered with a door hinge cover 53. Moreover, the outside temperature sensor 52 is provided in the inside of the door hinge cover 53 of the refrigerator 1 as a position which is hard to receive the influence of the temperature of the refrigerator 1, for example.

  Next, FIG. 2 is a front view of a state in which the door of the refrigerator compartment according to the embodiment of the present invention is removed. 3 is a cross-sectional view taken along the line BB in FIG. 2 and is a cross-sectional view of the first cold air duct 11a. FIG. 4 is a cross-sectional view taken along the line CC of FIG. 2 and is a cross-sectional view of the second cold air duct 11b. 5 is a cross-sectional view taken along the line DD of FIG.

  The outside of the refrigerator 1 and the inside of the refrigerator are separated by a heat insulating box 10 formed by filling a foam heat insulating material between the outer box 10a and the inner box 10b. In addition to the foam heat insulating material, a plurality of vacuum heat insulating materials 25 are mounted on the heat insulating box 10 between the outer box 10a and the inner box 10b. In each storage room, the refrigerator compartment 2 is separated from the upper freezer compartment 4 and the ice making chamber 3 by the upper heat insulating partition wall 28. Similarly, the lower freezer compartment 5 and the vegetable compartment 6 are separated by the lower heat insulating partition wall 29. Yes. A plurality of door pockets 33a, 33b, 33c are provided inside the refrigerator compartment doors 2a, 2b, and a plurality of shelves 34a, 34b, 34c, 34d, 34e (collectively, shelves 34) are vertically arranged in the refrigerator compartment 2. It is provided (see FIG. 4) and is partitioned into a plurality of storage spaces.

  Between the upper freezing room 4 and the ice making room 3 and the lower freezing room 5, a heat insulating partition wall 40 of the freezing room 7 (ice making room 3, upper freezing room 4, lower freezing room 5) is provided. In the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6, storage containers 4b, 5b, 6b that move integrally with the doors 4a, 5a, 6a provided in front of the respective compartments are provided. The storage containers 4b, 5b and 6b can also be pulled out by pulling out 5a and 6a to the near side. The ice making chamber 3 is also provided with a storage container that moves integrally with the door 3a, and the storage container 3b can be pulled out by pulling the door 3a to the front side.

  The cooler 14 is provided in a cooler storage chamber 8 provided substantially at the back of the lower freezer compartment 5, and is cooled by a first fan 9 that is a first air blower provided above the cooler 14. The cold air heat-exchanged with 14 is a refrigerator compartment cold air duct 11 (first cold air duct 11a, second cold air duct 11b), upper freezer compartment cold air duct 12, lower freezer compartment air duct 13, and ice making room air duct (not shown). ) To the respective storage rooms of the refrigerator compartment 2, the upper freezer compartment 4, the lower freezer compartment 5, and the ice making room 3.

  The blowing of cold air to each storage room is controlled by opening / closing the refrigerating room twin damper 20 and the freezing room damper 60. The refrigerator compartment twin damper 20 has baffles 20a and 20b which are examples of the first air volume adjusting means and the second air volume adjusting means, and is a so-called twin baffle type damper. The refrigerating room twin damper 20 adjusts the air volume by opening and closing the baffles 20a and 20b by the motor drive unit 46 (see FIG. 4). One end of the first cold air duct 11a is connected to the baffle 20a (first air volume adjusting device) side of the refrigerating room twin damper 20, and one end of the second cold air duct 11b is refrigerated. The twin damper 20 is connected to the baffle 20b (second air volume adjusting device) side.

  Moreover, the freezer compartment damper 60 adjusts the air volume supplied to the freezer compartment 7 by driving the baffle 60a (4th air volume adjusting device) by a motor drive part (not shown).

  A defrost heater 22 is provided below the cooler 14. The drain water generated at the time of defrosting falls once to the trough 23 and is discharged to the evaporating dish 21 provided on the upper part of the compressor 24 through the drain hole 27. In the machine room 61 provided at the lower back of the refrigerator 1, a radiator and a heat radiating fan (not shown) are arranged in addition to the compressor 24.

  A control board 51 equipped with a memory and an interface circuit is arranged behind the upper wall of the refrigerator 1, and the control of the refrigeration cycle and the air blowing system is performed according to the control means stored in the ROM of the control board 51. The control board 51 is covered with a board cover 50.

  Next, FIG. 4 shows a cross-sectional view of the second cold air duct 11 b of the cold room cold air duct 11. Since the configuration other than the cold room cool air duct 11 is the same as that shown in FIG. One end of the second cold air duct 11b is connected to the baffle 20b (second air volume adjusting device) side of the refrigerating room twin damper 20, and in the middle of the duct at the other end of the second cold air duct 11b. A second fan 15 is provided as a second blowing means. In the second cold air duct 11b, the cold air suction portion of the second fan 15 is provided inside the refrigerator compartment 2 inside the second cold air duct 11b, and on the cold air mixing region 19 side using the back space of the upper wall 63 of the refrigerator compartment 2, A cold air discharge part for the second fan 15 is provided. That is, the second fan 15 is arranged so as to suck in cold air from the front side of the refrigerator compartment 2 and discharge the cold air to the rear side of the refrigerator compartment 2. Second cold air circulation portions 31a and 31b are provided in the second cold air duct 11b at a position above the uppermost shelf 34a (see FIG. 4). The 2nd cold air distribution parts 31a and 31b have a function as a discharge mouth which discharges cold air.

  Since the distance between the second fan 15 provided in the second cold air duct 11b and the second cold air circulation portions 31a and 31b is short, the discharge port of the second cold air duct 11b is provided on the discharge side of the second fan 15. Then, the cool air is blown from the discharge port while being affected by the disturbance of the cool air by the second fan 15. Moreover, the speed distribution of the cool air discharged from the second fan 15 may also change when frost grows on the cooler 14 and the ventilation resistance of the ventilation path on the refrigerator compartment 2 side changes. Therefore, by providing the cold air mixing region 19 on the discharge side of the second fan 15, once the velocity distribution is relaxed, the cold air is discharged from the second cold air circulation portions 31a and 31b so that the air volume distribution is not biased. Consideration.

  In the case of the refrigerating room cooling operation for cooling the refrigerating room 2, the refrigerating room twin damper 20 is opened, the freezing room damper 60 is closed, and the third cold air circulation portions 30a, 30b, 30c provided in the first cold air duct 11a. , 30d, or cold air is sent to the refrigerator compartment 2 from the second cold air circulation portions 31a, 31b provided in the second cold air duct 11b (see FIG. 2). The cool air after cooling the refrigerating chamber 2 flows into a cool air returning portion 39 (see FIG. 2) provided at the lower portion of the refrigerating chamber 2 and then returned to the cooler 14.

  There are various methods for cooling the vegetable compartment 6, for example, a method of sending cold air to the vegetable compartment 6 after cooling the refrigerator compartment 2, or an air volume adjustment device dedicated to the vegetable compartment (an electric opening / closing damper device as an example) A method is conceivable in which the cold air exchanged by the cooler 14 is directly sent to the vegetable compartment 6. In the present embodiment, any method may be used for supplying cold air to the vegetable compartment 6. In the example described in FIG. 3 or FIG. 4, the cold air that has flowed into the vegetable compartment 6 passes through the vegetable compartment cold air return duct 18 from the vegetable compartment side cold air return portion 18 a provided in front of the lower part of the heat insulating partition wall 29. It flows into the cooler 14 lower part from the cooling chamber cold air return part 18b.

  In the case of the freezing room cooling operation for cooling the freezing room 7, the refrigerating room twin damper 20 is closed, the freezing room damper 60 is opened, and each of the upper freezing room cold air duct 12 and the lower freezing room cold air duct 13 is provided. After the cool air is discharged from the plurality of freezer cold air circulation units 12a, 13a, and 13b to cool the upper freezer chamber 4, the lower freezer chamber 5, and the ice making chamber 3, the freezer cold air return unit 17 returns the cooler 14 to the cooler 14. It is. There is also an operation of cooling the refrigerator compartment 2 and the freezer compartment 7 at the same time according to the temperature in the refrigerator. In this case, both the refrigerator compartment twin damper 20 and the freezer compartment damper 60 are opened and air is blown to each storage compartment. To do.

  A specific control method during the cooling operation and the inside of the refrigerating chamber 2 (region 2A (second region), region 2B (first region), region 2C) by the first cold air duct 11a and the second cold air duct 11b The method of flowing cold air (third region) will be described later.

  Next, the first cold air duct 11a and the second cold air duct 11b have an air passage formed of a heat insulating material such as polystyrene foam 41 as an example, and the first cold air duct 11a has a third cold air circulation portion 30a. 30b, 30c, 30d, and the cold air duct 11b are formed with second cold air circulation portions 31a, 31b, respectively. Ducts are formed on the back side of the first cold air duct 11a and the second cold air duct 11b using a seal member 62. The first cold air duct 11a and the second cold air duct 11b formed of the polystyrene foam 41 are combined with a panel-shaped back member 47 formed of resin, for example, and are installed on the back side of the refrigerator compartment 2. The first cold air duct 11a has a larger channel cross-sectional area than the second cold air duct 11b. In addition, the first cold air duct 11a is connected to the baffle 20a side having a large opening area of the refrigerating room twin damper 20, thereby efficiently cooling the food placed on the shelves 34b, 34c, 34d, and 34e that are frequently used. be able to. A third temperature sensor 42 and a first temperature sensor 44 are provided on the back member 47 that forms the refrigerator compartment cool air duct 11. Details of the third temperature sensor 42 and the first temperature sensor 44 will be described later.

  When the refrigerator compartment 2 is cooled by the first cold air duct 11a (see FIGS. 6a and 6b), the baffle 20a is opened, the baffle 20b is closed, and the refrigerator compartment 2 is cooled by the second cold air duct 11b (FIG. 7a). 7b), the baffle 20a is closed, the baffle 20b is opened, and the refrigerator compartment 2 is cooled by both the first cold air duct 11a and the second cold air duct 11b (see FIGS. 8a and 8b). The baffles 20a and 20b are opened.

  In the middle of the first cold air duct 11a, third cold air circulation portions 30a, 30b, 30c, and 30d are provided in order from the top, and the uppermost shelf 34a and the lowermost shelf are blown from each of them. The food placed on the area 2C (third area) partitioned by 34e, that is, the shelves 34b, 34c, 34d, and 34e is mainly cooled.

  Second cold air circulation portions 31a and 31b are provided at the tip of the second cold air duct 11b, that is, at a position above the uppermost shelf 34a. The food placed in the area 2A (second area) partitioned by the wall 63, that is, the uppermost shelf 34a and the uppermost door pocket 33a is mainly cooled. Moreover, since the 3rd cold air distribution | circulation part 30a is provided in the edge part of the 1st cold air duct 11a, the shelf 34a used as a part of area | region 2A can also be cooled by the 1st cold air duct 11a.

  A peripheral part of the door pockets 33b and 33c in front of the shelves 34b, 34c, 34d, and 34e, and a place defined by the lowermost shelf 34e and the upper heat insulating partition wall 28 are defined as a region 2B (first region). The region 2B is a region where the cold air blown from the first cold air duct 11a and the second cold air duct 11b flows in common. Furthermore, it becomes an area | region which is easy to be cooled by the influence of the freezer compartment 7 provided in the lower part of the refrigerator compartment 2. An ice making water tank 36 and a storage chamber 35 are provided above the upper heat insulating partition wall 28 in the region 2B. In the region 2B of the second cold air duct 11b, a damper 16 is provided in the first cold air circulation part 32a. The temperature of the storage chamber 35 is adjusted by opening and closing a baffle 16 a that is a third air volume adjusting means provided in the damper 16. The temperature setting of the storage chamber 35 can be set by a temperature setting button (not shown) as in the refrigerator compartment 2 and the freezer compartment 7. By opening and closing the baffle 16a provided on the back side of the storage chamber 35, the temperature is adjusted based on the temperature detected by the first temperature sensor 44 provided on the back side of the storage chamber 35. In general, the storage room 35 is often provided with a chilled room set lower than the temperature range of the refrigerator compartment 2. The temperature adjustment in the storage chamber 35 is adjusted by the amount of cool air blown by the baffle 16a of the damper 16, but when the temperature of the storage chamber 35 is increased, a heating means for adjusting the temperature provided at the lower portion of the storage chamber 35 (an example) In some cases, the heater 19) is used for heating.

  Although it is desirable to provide a damper 16 in the region 2B of the second cold air duct 11b, in the case of the first cold air circulation part 32a not provided with the damper 16, the cold air is blown to the second cold air duct 11b. When the refrigerator compartment 2 is cooled, the cold air is directly supplied from the first cold air circulation portion 32a to the vicinity of the storage chamber 35 and the ice making water tank 36, so that the first cold air circulation portion 32a is not excessively cooled. The size is adjusted in advance. When the temperature is too low, the temperature is adjusted by the heater 19 provided at the lower part of the storage chamber 35.

  The case where the damper 16 is not provided in the first cold air circulation part 32a is compared with the case where the damper 16 is provided in the first cold air circulation part 32a and the amount of cold air in the vicinity of the storage chamber 35 and the ice making water tank 36 is directly adjusted. And the energy-saving effect by the input reduction of the heater 19 at the time of performing the cold air circulation operation (refer FIG. 10a, 10b) in the refrigerator compartment 2 reduces. However, by operating the second fan 15 provided in the second cold air duct 11b, the cold air circulation operation in the refrigerator compartment 2 can be performed, so that an energy saving effect by reducing the input of the heater 19 is obtained. Details of the cold air circulation operation will be described later.

  FIG. 2 shows a decompression storage chamber as an example of the storage chamber 35. A pressure reducing pump (not shown) is provided to lower the internal pressure, and the storage chamber door 56 can be locked by a handle 55 to maintain the internal pressure. Moreover, since the store room 35 is provided in the area | region 2B in which the cold air ventilated from the 1st cold air duct 11a and the 2nd cold air duct 11b flows in common, it exists in the tendency for temperature to fall easily. Therefore, an indirect cooling method is employed so that cold air does not flow directly into the storage chamber 35 so as to be overcooled, thereby making it less susceptible to the temperature drop around the storage chamber 35. Further, since the ice making water tank 36 is also provided in the region 2B in addition to the storage chamber 35, the temperature decrease rate in the storage chamber 35 is suppressed by adding water into the ice making water tank 36 to increase the heat load. An effect (suppressing temperature fluctuation) is also obtained.

  Further, as will be described later with reference to FIG. 13, when the temperature of the upper space (region 2 </ b> A) of the refrigerator compartment 2 becomes high during the freezer compartment cooling operation, the second fan 15 is operated and the inside of the refrigerator compartment 2 is Circulate. At that time, if the temperature of the cold air passing around the ice making water tank 36 is higher than the water in the ice making water tank 35, the water in the ice making water tank 35 may be used as a cold heat source (heat storage material). it can.

  In the present embodiment, the third temperature sensor 42 provided in the region 2C defined by the uppermost shelf 34a and the lowermost shelf 34e of the refrigerator compartment 2 is partitioned by the upper shelf 34a and the upper wall of the refrigerator compartment 2. The second temperature sensor 43 provided in the region 2A, the first cold air duct 11a, and the first cold air blown from the respective outlets of the second cold air duct 11b are provided in the region 2B provided in common. Temperature sensors 44 are provided. For example, the third temperature sensor 42 is located between the second temperature sensor 43 and the first temperature sensor 44, and is a rear member 47 that forms the refrigerating room cool air duct 11 provided on the back side of the refrigerating room 2. It is provided on the storage space side. The second temperature sensor 43 is provided on the upper wall 63 of the refrigerator compartment 2. The first temperature sensor 44 is provided on the storage space side of the back member 47 that forms the refrigerator compartment cool air duct 11 in a region defined by the lowest shelf 34e and the upper heat insulating partition wall 28.

  The third temperature sensor 42 is an area 2C defined by the uppermost shelf 34a and the lowermost shelf 34e of the refrigerator compartment 2, and the second temperature sensor 43 is the uppermost shelf 34a and the upper wall 63. If the partitioned area 2A and the first temperature sensor 44 can detect the temperature of the area 2B in which the cold air blown from the cold air circulation portions of the first cold air duct 11a and the second cold air duct 11b flows in common. However, it is not necessarily limited to this position. Furthermore, you may provide the cover which covers and protects at least one part of each temperature sensor.

  A third temperature sensor 42 for detecting the temperature of the region 2C defined by the uppermost shelf 34a and the lowermost shelf 34e of the refrigerator compartment 2, and the upper shelf 63a and the upper wall 63 of the refrigerator compartment 2 are partitioned. The second temperature sensor 43 for detecting the temperature of the area 2A, the third cold air circulation portions 30a, 30b, 30c, 30d of the first cold air duct 11a and the second cold air circulation portions 31a, 31b of the second cold air duct 11b The baffles 20a and 20b of the refrigerating room twin damper 20 are controlled according to the temperature detected by the first temperature sensor 44 that detects the temperature of the region 2B through which the cold air blown from the common air flows.

  The cold air blowing performed by switching the two cold air ducts of the first cold air duct 11a and the second cold air duct 11b in the refrigerator compartment 2 is performed for the following reason.

  The invasion of heat from the outside of the refrigerator compartment 2 is a phenomenon caused by the temperature difference between the inner wall surface of the refrigerator compartment 2 and the outside air. The average temperature of the refrigerator compartment 2 is maintained at a plus temperature of about 5 ° C. as an example, but negative temperature cold air may be discharged from the outlet of the refrigerator compartment cold air duct. When this discharged cold air is circulated along the inner wall surface of the refrigerator compartment 2, the wall surface is cooled and the temperature becomes lower. For this reason, the heat intrusion from the outside becomes large, which may cause an increase in power consumption. For example, when the outside air temperature is 30 ° C., the temperature near the control board 51 provided in the upper part of the refrigerator compartment 2 is about 40 ° C., and excessive cooling of the upper wall 63 of the refrigerator compartment 2 is a temperature difference between the inside and outside of the refrigerator. However, the heat penetration becomes larger and the energy saving performance deteriorates.

  In a conventional general refrigerator, while the refrigerator compartment 2 is being cooled, cold air is constantly circulated along the upper wall surface and the side wall surface inside the refrigerator compartment 2 from the vicinity of the front end portion of the refrigerator compartment cool air duct. Therefore, energy saving performance may be deteriorated by excessively cooling the wall surface in the refrigerator compartment 2.

  In the present embodiment, based on the temperatures detected by the first temperature sensor 44, the second temperature sensor 43, and the third temperature sensor 42, two cold air ducts provided for cooling the refrigerator compartment 2, that is, Refrigerating room with improved energy-saving performance by suppressing excessive cooling of the inner wall surface of the refrigerating room 2 by switching between the first cold air duct 11a and the second cold air duct 11b, which increase the ratio of the amount of cool air. Two cooling operations can be performed.

  Next, FIG. 6a shows the flow of cold air when the refrigerator compartment 2 is cooled by the first cold air duct 11a. 6b is a cross-sectional view taken along line EE of FIG. 6a.

  6a and 6b, the baffle 20a of the refrigerating room twin damper 20 is opened (the baffle 20b is closed), and cold air is blown from the third cold air circulation portions 30a, 30b, 30c, and 30d provided in the first cold air duct 11a. Then, after cooling the food placed on the region 2C partitioned mainly by the uppermost shelf 34a and the lowermost shelf 34e, that is, the shelves 34b, 34c, 34d, 34e in the frequently used place, This is a cooling means that places emphasis on energy saving performance and cools the region 2B defined by the door pockets 33b and 33c and the lowermost shelf 34e and the upper heat insulating partition wall 28. Further, since the first cold air duct 11a is provided with the third cold air circulation portion 30a at a position above the uppermost shelf 34a, the food placed on the uppermost shelf 34a can be cooled.

  By operating the first fan 9, the cold air blown from the respective third cold air circulation portions 30 a, 30 b, 30 c, 30 d of the first cold air duct 11 a The cold air flows into the region 2B defined by the shelf 34e and the upper heat insulating partition wall 28, passes through the periphery of the ice making water tank 36 and the storage chamber 35, and then is returned to the cooler 14 from the refrigerating chamber cold air return section 39. Since the ice making water tank 36 and the storage chamber 35 are generally provided under the lowest shelf 34e of the refrigerator compartment 2, it is necessary to control the temperature so as not to freeze.

  Next, FIG. 7a shows the flow of cold air when the refrigerator compartment 2 is cooled by the second cold air duct 11b. FIG. 7B is a cross-sectional view taken along line FF in FIG. 7A. The cold air in the refrigerating room 2 by the second cold air duct 11b opens the baffle 20b of the refrigerating room twin damper 20 (the baffle 20a is closed), and blows the cold air along the vicinity of the upper wall 63 of the refrigerating room 2, After the area 2A is mainly cooled, the area 2B defined by the middle door pockets 33b and 33c, the lowermost shelf 34e and the heat insulating partition wall 28 is cooled. Thereafter, similarly, the cooler 14 returns to the cooler 14 from the cold room return portion 39. The cool air is blown into the refrigerator compartment 2 using the second cool air duct 11b by operating the first fan 9 and the second fan 15. A method of operating the second fan 15 provided at the end of the second cold air duct 11b will be described later. FIG. 7b shows an example of the flow of cold air when the baffle 16a of the damper 16 provided in the second cold air duct 11b is open.

  Next, FIG. 8a is a flow of cold air when the refrigerator compartment 2 is cooled using the first cold air duct 11a and the second cold air duct 11b simultaneously. FIG. 8b is a diagram showing the duct cross sections of the first cold air duct 11a and the second cold air duct 11b together.

  Both the baffles 20a and 20b of the refrigerating room twin damper 20 are opened, and the first cooling air duct 11a and the second cooling air duct 11b can be used to perform the same cooling as that in the past without dividing the cooling air duct of the refrigerating room 2. . In this case, the region 2B defined by the door pockets 33b and 33c, the lowermost shelf 34e and the upper heat insulating partition wall 28 includes the third cold air circulation portions 30a, 30b, 30c and 30d of the first cold air duct 11a, Since it becomes the area | region where the cold air sent from the 2nd cold air distribution | circulation part 31a, 31b of the 2nd cold air duct 11b flows in common, it becomes easy to cool. Further, the food placed on the uppermost shelf 34a is also caused by the cold air discharged from the third cold air circulation part 30a of the first cold air duct 11a and the second cold air circulation parts 31a and 31b of the second cold air duct 11b. Because it can be cooled, it is suitable for rapidly cooling food.

  Next, the cooling method of the refrigerator compartment 2 is demonstrated using a temperature chart. Further, in the region 2B defined by the lowermost shelf 34e and the upper heat insulating partition wall 28, which is generated when the first cool air duct 11a and the second cool air duct 11b are switched and the cool air is blown into the refrigerator compartment 2. The overcooling suppression means will be described.

  FIG. 9 is a temperature chart during the cooling operation of the refrigerator compartment according to the embodiment of the present invention. For example, when the temperature detected by the third temperature sensor 42 reaches (TR3) Max (third temperature sensor upper limit temperature threshold value), the cooling operation of the refrigerator compartment 2 starts the baffle of the refrigerator compartment twin damper 20. 20a is opened and cold air is blown into the refrigerator compartment 2 by the first cold air duct 11a. Similarly, when the temperature detected by the second temperature sensor 43 reaches (TR2) Max (second temperature sensor upper limit temperature threshold value), the baffle 20b of the refrigerator compartment twin damper 20 is opened, and the second temperature sensor 43 is opened. Cold air is blown into the refrigerator compartment 2 by the cold air duct 11b. In FIG. 9, as an example, the cooling by the first cold air duct 11a and the second cold air duct 11b starts simultaneously at time t1, but it does not necessarily have to start simultaneously.

  At time t2, for example, when hot food is stored in the uppermost shelf 34a, the door pocket 33a or the like, or when the doors 2a and 2b are frequently opened and closed, the second temperature sensor 43 nearby is used. The detected temperature increases once due to an increase in heat load, and then decreases after a while. The blowing of cold air from the first cold air duct 11a ends at time t3 when the third temperature sensor 42 reaches the temperature (TR3) Min (third temperature sensor lower limit temperature threshold).

  Under such conditions, the time (time t5) until reaching the temperature at which the cooling air blowing from the second cold air duct 11b is stopped, that is, (TR2) Min1 (second temperature sensor lower limit temperature threshold) is delayed. Therefore, the surroundings of the ice making water tank 36 and the storage chamber 35 provided in the lower part of the refrigerator compartment 2 continue to be cooled at the same time. The temperature detected by the first temperature sensor 44 for determining the prevention of freezing of the water in the ice-making water tank 36 and the food in the storage room 35 is divided into two levels, that is, (TR1) Min1 (first temperature sensor lower limit temperature threshold value). ) And a lower temperature (TR1) Min2 (first temperature sensor lower limit second temperature threshold) are determined in advance.

  At time t4, the temperature detected by the first temperature sensor 44 is lower than (TR1) Min1, but the uppermost shelf 34a, the door pocket 33a, etc. near the second temperature sensor 43, etc. In order to give priority to the cooling of the food contained in the air, the blowing of the cold air from the second cold air duct 11b is continued until the time t5 when the temperature reaches the temperature (TR2) Min1. However, the cooling by the second cold air duct 11b is performed until the temperature detected by the first temperature sensor 44 reaches (TR1) Min2.

  At time t5 when the temperature (TR2) Min1 is reached, the first fan 9 is stopped and the cooling air cooled by the cooler 14 is stopped. At this point, the baffle 20a and the baffle 20b of the refrigerator compartment twin damper 20 are both closed. When the freezer compartment cooling operation for continuously cooling the freezer compartment 7 is performed, the operation of the first fan 9 is continued, the damper 60 is opened, and cool air is blown into the freezer compartment 7.

  If the temperature detected by the first temperature sensor 44 remains below (TR1) Min1, the water in the ice making water tank 36 and the food in the storage room 35 may freeze, so the temperature in the refrigerator compartment 2 is relatively high. The temperature is raised so as to be equal to or higher than the temperature (TR1) Min1 by using the air in the upper space. The storage chamber 35 can be set to a high temperature side temperature threshold (TR1) H and a low temperature side temperature threshold (TR1) L, for example, depending on the temperature detected by the first temperature sensor 44. In the example shown in FIG. 9, the second fan 15 is operated until time t6 when the first temperature sensor 44 reaches the low temperature side temperature threshold value (TR1) L. Further, when the operation of the second fan 15 is continued and the temperature detected by the first temperature sensor 44 is set to the high temperature side temperature threshold (TR1) H, the second temperature sensor 43 sets (TR2) Min2 to When the temperature is lower, the operation of the second fan 15 is stopped and heating is performed only by the heater 19.

  Since the second fan 15 is operated to circulate in the refrigerator compartment 2, the temperature detected by the first temperature sensor 44 using the air (relatively higher temperature) in the region 2A (TR1). ) While being raised to L, the temperature detected by the second temperature sensor 43 by the air (relatively low temperature) in the region 2B defined by the lowermost shelf 34e and the upper heat insulating partition wall 28 is (TR2) When it becomes Min1 or less, the operation of the second fan 15 is stopped at that time, and only the heater 19 is heated until the first temperature sensor 44 reaches (TR1) L. Or, even if the second temperature sensor 43 becomes lower than (TR2) Min1, there is little influence on the food placed on the shelf 34 in the region 2C where the frequency of use is high. Therefore, the second lower limit is newly set below (TR2) Min1. A temperature threshold value (TR2) Min2 may be provided, and the second fan 15 may be operated until reaching (TR2) Min2.

  Conventionally, when the temperature of the ice making water tank 36 and the storage chamber 35 is increased, it is heated by the heater 19 provided at the lower portion of the storage chamber 35. However, in the refrigerator of this embodiment, the second cold air in the refrigerator compartment 2 is heated. The second fan 15 provided in the duct 11b can raise the temperature of the region below the refrigerator compartment 2 by using air having a relatively high temperature above the refrigerator compartment 2 as a heat source. Accordingly, when the temperature of the ice making water tank 36 and the storage chamber 35 is increased, the heater 19 can be used in combination with the second fan 15 during the cold air circulation operation alone or during the cold air circulation operation. Input can be suppressed. The heating control by the heater 19 may be control for changing the energization ratio by repeating ON and OFF, or control for reducing the input of the heater 19 from level 1 to level 2 as shown in FIG.

  Here, the cold air circulation performed in the refrigerator compartment 2 will be described. FIG. 10A is a diagram showing a state of cold air circulation in the refrigerator compartment 2 by the second cold air duct 11b. 10b is a cross-sectional view taken along line GG in FIG. 10a. When the second fan 15 is operated, the baffles 20a and 20b of the refrigerating room twin damper 20 are closed, and the baffles 16a of the damper 16 are opened, air in the region 2B flows into the second cold air duct 11b from the baffle 16a. The second cold air circulation portions 31a and 31b are discharged into the region 2A and can be circulated in the refrigerator compartment 2 without passing through the cooler 14. Since the air in the region 2A having a relatively high temperature circulates toward the region 2B having a relatively low temperature in this way, the temperature of the region partitioned by the lowest shelf 34e and the upper heat insulating partition wall 28 can be increased. it can. As shown in FIG. 9, when the temperature detected by the first temperature sensor 44 reaches (TR1) L, the second fan 15 is stopped and the cold air circulation operation in the refrigerator compartment 2 is ended.

  The cold air blown from the second cold air circulation portions 31a and 31b of the second cold air duct 11b passes through the region 2A, the region 2B, the first cold air circulation portion 32a, and the baffle 16a in the refrigerating chamber 2 and again becomes the second air. Return to the cold air duct 11b. Since this cold air circulation path is a path along the upper wall 63 of the refrigerator compartment 2 and the doors 2a and 2b, the temperature fluctuation of the region 2C which is divided by the uppermost shelf 34a and the lowermost shelf 34e and which is frequently used. Can be kept relatively small and has little impact on the shelf life of food. Further, the air in the region 2A having a relatively high temperature can be used as a heat source due to the effect of the cold air circulation in the refrigerator compartment 2, so that the input of the heater 19 provided on the upper heat insulating partition wall 28 at the lower part of the storage compartment 35 can be suppressed. Energy saving performance can be improved. Although it becomes a circulation path along the upper wall 63 and the doors 2a and 2b of the refrigerator compartment 2, in order to circulate the cool air of the plus temperature zone in the refrigerator compartment 2, the cold air of the minus temperature cooled by the cooler 14 is circulated. Compared to the case, the increase in heat intrusion from the outside of the warehouse is small, and the influence on the power consumption is small.

  Thus, in the cooling means of the refrigerator compartment 2 which is the basis of this embodiment, the refrigerator compartment cold air duct 11 is divided into two parts, the first cold air duct 11a and the second cold air duct 11b, and cooled. The baffle 20a and the baffle 20b are controlled to open and close based on the third temperature sensor 42 and the second temperature sensor 43, respectively. In addition, the baffle 20a and the baffle 20b are closed for the purpose of preventing freezing of the ice making water tank 36 and the storage chamber 35 that are always cooled by the cold air from the first cold air duct 11a and the second cold air duct 11b. By opening the baffle 16a and operating the second fan 15 provided in the second cold air duct 11b, the first temperature sensor 44 is frozen by using the air in the upper part of the refrigerating chamber 2 having a relatively high temperature as a heat source. The temperature is adjusted while being used together with the heater 19 so that the temperature is higher than the prevention temperature. The cold air circulation in the refrigerator compartment 2 by the second fan 15 is performed when the temperature detected by the second temperature sensor 43 is higher than the temperature detected by the first temperature sensor 44.

  Next, FIG. 11 is a temperature chart of another control during the cooling operation of the refrigerator compartment according to the embodiment of the present invention.

  At time t2, when hot food is stored on the shelves 34b, 34c, 34d in the region 2C divided by the uppermost shelf 34a and the lowermost shelf 34e, or many foods are brought in at a time The temperature detected by the third temperature sensor 42 provided in the vicinity of the temperature sensor increases once due to an increase in heat load, and then decreases after a while.

  In such a case as well, the phenomenon of overcooling in the lower part of the refrigerator compartment 2 described with reference to FIG. 9 occurs. The temperature at which the cooling air from the first cold air duct 11a is stopped, that is, the time (time t5) to reach (TR3) Min is delayed. During this time, the ice making water tank provided at the lower part of the refrigerator compartment 2 The surroundings of 36 and the storage chamber 35 are also continuously cooled. The temperature detected by the first temperature sensor 44 for determining the prevention of freezing of the water in the ice-making water tank 36 and the food in the storage room 35 is divided into two stages, that is, (TR1) Min1 and a lower temperature (TR1) Min2. Is determined in advance. The temperature already detected by the first temperature sensor 44 at time t4 is lower than (TR1) Min1, but the food placed on the shelves 34b, 34c, 34d in the region 2C, which is near the third temperature sensor 42. In order to give priority to the cooling of the air, the blowing of the cold air from the first cold air duct 11a is continued until the time t5 when the temperature (TR3) Min is reached. However, the cooling by the first cold air duct 11a is performed until the temperature detected by the first temperature sensor 44 reaches (TR1) Min2.

  At time t5 when the temperature (TR3) Min is reached, the first fan 9 is stopped and the cooling air cooled by the cooler 14 is stopped. At this time, the baffle 20a and the baffle 20b of the refrigerator compartment twin damper 20 are both closed. When the freezer compartment cooling operation for continuously cooling the freezer compartment 7 is performed, the operation of the first fan 9 is continued, the damper 60 is opened, and cool air is blown into the freezer compartment 7.

  If the temperature detected by the first temperature sensor 44 remains below (TR1) Min1, the water in the ice making water tank 36 and the food in the storage room 35 may freeze, so the temperature in the refrigerator compartment 2 is relatively high. It is necessary to raise the temperature so as to be equal to or higher than the temperature (TR1) Min1 using the air in the upper space. In FIG. 11, the first temperature sensor 44 operates the second fan 15 until time t6 when the temperature reaches the lower temperature (TR1) L. In this case as well, even if the second temperature sensor 43 becomes lower than (TR2) Min1, there is little influence on food on the shelf in the region 2C where the frequency of use is high, so (TR2) newly below Min1 ( TR2) Min2 (second temperature sensor lower limit second temperature threshold) may be provided, and the second fan 15 may be operated until reaching (TR2) Min2.

  Conventionally, when the temperature of the ice making water tank 36 and the storage chamber 35 is increased, it is heated by the heater 19 provided at the lower portion of the storage chamber 35. However, in the refrigerator of this embodiment, the second cold air in the refrigerator compartment 2 is used. The second fan 15 provided in the duct 11b can raise the temperature of the region below the refrigerator compartment 2 by using air having a relatively high temperature above the refrigerator compartment 2 as a heat source. Accordingly, when the temperature of the ice making water tank 36 and the storage chamber 35 is increased, the heater 19 can be used in combination with the cold air circulation in the refrigerator compartment 2 by the second fan 15 or in combination with the cold air circulation. The input of the heater 19 can be suppressed. The cold air circulation operation in the refrigerator compartment 2 using the second fan 15 is the same as the cold air flow shown in FIGS. 10a and 10b.

  Next, FIG. 12 is a temperature chart of another control during the cooling operation of the refrigerator compartment according to the embodiment of the present invention.

  Depending on the place where food is put into the refrigerator compartment 2 and the amount of food put, the temperature of both the second temperature sensor 43 and the third temperature sensor 42 may rise. Since the temperature detected by the second temperature sensor 43 and the third temperature sensor 42 is increased at time t2 after the food is added, the temperature when stopping the blowing of the cold air from the first cold air duct 11a, That is, the time to reach (TR3) Min and the temperature at which cooling air from the second cold air duct 11b is stopped, that is, the time to reach (TR2) Min1 are delayed. Accordingly, since the time for cooling the inside of the refrigerator compartment 2 becomes longer, the surroundings of the ice making water tank 36 and the storage compartment 35 provided at the lower part of the refrigerator compartment 2 are also continuously cooled, and the risk of freezing increases.

  The temperature detected by the first temperature sensor 44 for determining the prevention of freezing of the water in the ice making water tank 36 and the food in the storage chamber 35 is divided into two stages, that is, (TR1) Min1 and a lower temperature (TR1). Min2 is determined in advance. At time t4, the temperature detected by the first temperature sensor 44 is lower than (TR1) Min1, but at time t5, the temperature detected by the second temperature sensor 43 is (TR2) Min1. The temperature detected by the third temperature sensor 42 does not reach (TR3) Min, but the temperature detected by the first temperature sensor 44 reaches (TR1) Min2. Therefore, the baffle 20a and the baffle 20b are closed to stop the blowing of cool air. At this time, both the baffle 20a and the baffle 20b are in a closed state. However, when the freezer compartment cooling operation for continuously cooling the freezer compartment 7 is performed, the operation of the first fan 9 is continued. Cool air is blown into the freezer compartment 7.

  If the temperature detected by the first temperature sensor 44 remains below (TR1) Min1, the water in the ice making water tank 36 and the food in the storage room 35 may freeze, so the temperature in the refrigerator compartment 2 is relatively high. It is necessary to raise the temperature so as to be equal to or higher than the temperature (TR1) Min1 using the air in the upper space. The storage chamber 35 can be set to a high temperature side temperature threshold (TR1) H and a low temperature side temperature threshold (TR1) L, for example, depending on the temperature detected by the first temperature sensor 44. As an example, in FIG. 12, the second fan 15 is operated until the time t6 when the first temperature sensor 44 reaches the low temperature side temperature threshold (TR1) L.

  In the refrigerator of the present embodiment, since the cold air circulation by the second fan 15 provided in the refrigerator compartment 2 or the cold air circulation and the heater 19 can be used in combination, the surroundings of the ice making water tank 36 and the storage chamber 35 can be used. Therefore, the input to the heater 19 can be suppressed accordingly. The cold air circulation operation in the refrigerator compartment 2 using the second fan 15 is the same as the cold air flow shown in FIGS. 10a and 10b.

  Next, FIG. 13 is a temperature chart in the case of another control during the cooling operation of the refrigerator compartment according to the first embodiment of the present invention.

  During the time period in which the freezer compartment 7 is cooled (after time t5 in FIG. 13), cold air is not supplied to the refrigerating compartment 2, so that the effect of natural convection appears, and the lowest shelf 34e and the upper insulating partition wall 28 The temperature of the region 2B partitioned by the above is low, and the temperature of the region 2A partitioned by the uppermost shelf 34a and the upper wall 63 tends to be high. When the heat insulation performance of the refrigerator 1 is increased, the cooling capacity is reduced, so that the compressor 24 can be operated at a low speed and the power consumption can be reduced. However, the cooling time by blowing cold air to each storage room becomes longer, and the refrigerating room 2 is a longer space than the freezing room 7, so that the freezing room cooling operation in which no cold air is supplied to the refrigerating room 2 is long. In the refrigerator compartment 2, the temperature of the region 2A tends to increase due to the effect of natural convection.

  If the temperature detected by the second temperature sensor 43 during the freezer cooling operation is equal to or higher than (TR2) Min, the baffle 20a and the baffle 20b are kept closed, the baffle 16a is opened, and the second fan 15 is operated. Then, the temperature detected by the second temperature sensor 43 is lowered. When the second fan 15 is operated, the temperature of the region 2A decreases, but the temperature of the region 2B increases. Therefore, the operation of the second fan 15 is performed at least at a temperature detected by the first temperature sensor 44 ( TR1) until H is reached.

  The operation of simultaneously cooling the freezer compartment 7 and the refrigerator compartment 2 takes into account the freezer compartment 7 maintained at a minus temperature, and therefore becomes lower than the temperature of the cooler 14 when the refrigerator compartment 2 is operated alone, and the refrigerating cycle. Becomes less efficient. Therefore, since the efficiency of the refrigerating cycle is improved when the freezer compartment 7 and the refrigerating compartment 2 are cooled at the temperature of the cooler 14 suitable for each temperature zone, the cold air is blown to the refrigerating compartment 2 during the freezing compartment cooling operation. If you do not, energy saving performance will increase.

  9, 11, and 12, in order to prevent freezing of water in the ice-making water tank 36 disposed in the region 2 </ b> B and food in the storage room 35, the second cooling air duct 11 b provided in the second cold air duct 11 b after the cooling room cooling operation is used. It has been described that the temperature detected by the first temperature sensor 44 can be increased while the input of the heater 19 is suppressed by operating the second fan 15.

  Furthermore, during the freezer compartment cooling operation, the time period during which the cool air is not blown to the refrigerator compartment 2 becomes longer, so that the refrigerator compartment 2 is easily affected by natural convection and the temperature of the upper part of the refrigerator compartment 2, that is, the region 2A is likely to increase. Become. By operating the second fan 15 provided in the second cold air duct 11b, the temperature detected by the second temperature sensor 43 using the air at the lower part of the refrigerator compartment 2 having a relatively low temperature ( TR2) Max or less. Thereby, an efficient cooling operation can be continued without simultaneously cooling the refrigerator compartment 2 with the cool air cooled by the cooler 14 during the freezer cooling operation.

  The operation of the first fan 9 provided in the second cold air duct 11b is aimed at the cold air circulation in the refrigerator compartment 2 as described in the temperature charts of FIGS. 9, 11, 12, and 13. It is. That is, the cold air blown from the respective cold air flow portions of the first cold air duct 11a and the second cold air duct 11b suppresses overcooling of the region 2B in which it flows in common, and the upper part of the refrigerator compartment 2 during the freezer cooling operation. Is to suppress the temperature rise.

  Next, another operation method of the second fan 15 will be described. As shown in FIG. 3, when the time for opening the doors 2a and 2b of the refrigerator compartment 2 is long, the cold air in the refrigerator compartment 2 flows out downward from the outside due to the effect of natural convection. On the other hand, high temperature air flows into the upper part of the refrigerator compartment 2, that is, the region 2A from the outside of the refrigerator. As described above, if the food is frequently taken in and out, the temperature around the area 2A and the area 2B, in particular, the door pockets 33a, 33b, and 33c becomes high, so the temperature detected by the second temperature sensor 43 (for example, When the cool air cooled by the cooler 14 is blown to the refrigerating chamber 2 in response to the temperature (TR2) Max higher than (TR2) Max), the first fan 9 and the second fan 9 The fan 15 may be operated simultaneously. Further, when the temperature detected by the third temperature sensor 42 becomes higher than (TR3) Max, the first fan 9 and the second fan 15 are operated, and the first cold air duct 11a Cold air can also be blown from both of the second cold air ducts 11b.

  As described above, the second fan 15 provided in the second cold air duct 11b blows the cold air in the refrigerating chamber 2 through which the cooler 14 does not pass and the cool air cooled by the cooler 14 to the refrigerating chamber 2. It can also be used for normal cooling operation.

1 Refrigerator 2 Refrigerated room (storage room in refrigerated temperature zone)
2a, 2b Refrigeration room door 2A Second area 2B First area 2C Third area 3 Ice making room 4 Upper freezer room 5 Lower freezer room 6 Vegetable room 7 Freezer room (freezer temperature storage room)
8 Cooler storage chamber 9 First fan (first blowing means)
DESCRIPTION OF SYMBOLS 10 Heat insulation box 11 Cold room cold air duct 11a 1st cold air duct 11b 2nd cold air duct 12 Upper stage freezer compartment cold air duct 13 Lower stage freezer compartment cold air duct 14 Cooler 15 2nd fan (2nd ventilation means)
16 Damper 16a Baffle (third air volume adjustment device)
20 Cold room twin damper 20a Baffle (first air flow adjustment device)
20b baffle (second air volume adjustment device)
24 Compressor 28 Upper heat insulation partition wall 29 Lower heat insulation partition walls 30a, 30b, 30c, 30d Third cold air circulation part 31a, 31b Second cold air circulation part 32a First cold air circulation part 33a, 33b, 33c Door pockets 34, 34a, 34b, 34c, 34d, 34e Shelf 35 Storage chamber 36 Ice making water tank 39 Cold air return section 42 Third temperature sensor (third temperature detection means)
43 Second temperature sensor (second temperature detection means)
44 1st temperature sensor (1st temperature detection means)
47 Back member 56 Storage room door 60 Freezer room damper 60a Baffle (fourth air volume adjusting device)
63 Upper wall

Claims (5)

A storage room in a refrigerated temperature zone, a plurality of shelves in the storage room,
A first cold air duct and a second cold air duct for supplying cold air to at least one of the spaces between the plurality of shelves;
First air blowing means for blowing cold air to each of the first cold air duct and the second cold air duct;
A second blowing means in the second cold air duct;
A first air volume adjusting device for controlling air flow of the first cold air duct;
A second air volume adjusting device for controlling the ventilation of the second cold air duct;
A first region to which cold air is supplied from the first cold air duct and the second cold air duct;
A second region in which cold air is supplied from the second cold air duct between the uppermost shelf in the storage chamber and the upper wall of the storage chamber;
A third region in which cold air is supplied from the first cold air duct between the uppermost shelf and the lowermost shelf in the storage chamber;
A first cold air circulation section provided in the first region of the second cold air duct;
A second cold air circulation section provided in the second region of the second cold air duct;
A cold return portion of the first region;
First temperature sensing means in the first region;
And a second temperature detecting means for the second region. A third air volume adjusting device of the first cold air circulation part of the second cold air duct;
A third temperature detecting means of the third region,
Based on the temperatures detected by the first to third temperature detecting means, the first air volume adjusting device, the second air volume adjusting device, and the third air volume adjusting device are controlled, and A circulation operation is performed in which the cold air in one region and the second region is circulated by the second air blower through the first cold air circulation portion, the second cold air circulation portion, and the second cold air duct. The refrigerator according to claim 1, wherein   When the temperature detected by the first temperature detecting means becomes the lower limit temperature threshold or the lower limit temperature threshold or less, the air blowing of the first cold air duct and the second cold air duct is stopped, and the first The refrigerator according to claim 2, wherein heating is performed until the temperature detected by the first temperature detection unit reaches the lower limit temperature threshold or the lower limit temperature threshold by the heating unit in one region. . The first temperature detecting means, the third air volume adjusting device, and the cold air return section are the lowest shelf in the storage chamber, and a storage chamber in a freezing temperature zone adjacent to the lower portion of the storage chamber. The refrigerator according to claim 2, wherein the refrigerator is provided between the partition walls and the heat insulating partition walls. The refrigerator according to any one of claims 1 to 3, further comprising a storage container that indirectly cools the first region and a water tank.