JP2018179466A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator with enhanced cooling efficiency of an upper space of a storage room and improved energy-saving performance.SOLUTION: A refrigerator includes a storage room having a refrigeration temperature zone, a first cool air duct 11a and a second cool air duct 11b which are provided at a rear face side of the storage room, and blowing means for blowing cool air to the first cool air duct 11a and the second cool air duct 11b from below. In the refrigerator, the first cool air duct 11a is formed up to a position higher than the second cool air duct 11b, and a width dimension of the first cool air duct 11a is made wider than that of the second cool air duct 11b at least up to an upper end of the second cool air duct 11b.SELECTED DRAWING: Figure 3

Description

The present invention relates to a refrigerator.

  By appropriately detecting the temperature in the storage room with a temperature detection means, there has been proposed a technology for providing a refrigerator with high energy saving property by improving the storability and reliability of food. For example, in the refrigerator described in Patent Document 1 below, the first cold air duct and the second cold air duct are formed, and the cold air is supplied to a predetermined region in the storage room by the respective ducts.

Unexamined-Japanese-Patent No. 2014-40967

  In the refrigerator described in Patent Document 1, the cross-sectional area of the second cold air duct, which reaches the upper side of the first cold air duct, is smaller than that of the first cold air duct.

However, if the cross-sectional area of the flow path is reduced, the ventilation resistance increases, and if the flow path is lengthened, the ventilation resistance increases. For this reason, the second cold air duct in Patent Document 1 receives a large ventilation resistance as a whole, reaches the downstream side, and rises in temperature at the stage where the cold air is discharged into the storage chamber, thereby lowering the cooling efficiency. As a result, there is a possibility that the temperature in the storage chamber upper space, which is generally likely to be high due to the rise of warm air, may be further raised.
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a refrigerator in which the cooling efficiency of the upper space of the storage room is enhanced and the energy saving property is improved.

  A storage room of a refrigerated temperature zone, a first cold air duct and a second cold air duct provided on the back side of the storage room, an air blowing means for blowing cold air from below to the first cold air duct and the second cold air duct; The first cold air duct is formed to a position higher than the second cold air duct, and at least at the height of the upper end of the second cold air duct, the width dimension of the first cold air duct is equal to the width of the first cold air duct. It was wider than the width of the second cold air duct.

  By increasing the cross-sectional area of the first cold air duct where the ventilation resistance becomes large due to the long flow path, the ventilation resistance until the cold air reaches the downstream can be suppressed as a whole, and as a result, the storage room upper space It becomes possible to blow cold air efficiently and to provide a refrigerator with improved energy saving performance.

It is a front view of a refrigerator concerning an embodiment of the present invention. It is AA sectional drawing of FIG. It is a front view of a refrigerator compartment. It is a BB sectional view of FIG. It is a front view of the cold air duct of the refrigerator compartment concerning this embodiment. It is CC sectional drawing of FIG. It is a figure which shows the flow of cold air at the time of cooling with the 1st cold air duct 11a. It is a figure which shows the flow of cold air at the time of cooling with the 2nd cold air duct 11b. It is a figure which shows the flow of cold air at the time of cooling with both the 1st cold air duct 11a and the 2nd cold air duct 11b. It is a disassembled perspective view which shows the cold air duct of a refrigerator compartment. It is the perspective view which looked at the panel cover 30 from the back side. FIG. 6 is a perspective view of the flow path forming member 41 as viewed from the back side. FIG. 10 is an enlarged perspective view showing the vicinity of the discharge port 30 b in a state in which the flow path forming member 41 is fitted to the panel cover 30. FIG. 6 is an enlarged perspective view of the front concave portion 30 w 1 of the panel cover 30 as viewed from the front side. It is a flowchart which shows control of automatic rapid cooling. It is a time chart of automatic rapid cooling. It is a time chart when lower stage cooling is set to ON. It is a time chart when lower stage cooling is set to OFF.

Embodiments of the present invention will be described using the drawings.
FIG. 1 is an external view of a refrigerator according to the present embodiment. As shown in FIG. 1, the refrigerator 1 according to the present embodiment includes a refrigerator 2, an ice chamber 3, an upper freezer 4, an lower freezer 5, and a vegetable 6 from the top. The refrigerator compartment 2 is provided with refrigerator compartment doors 2a and 2b divided into right and left, and the icemaker 3, upper freezer compartment 4, lower freezer compartment 5 and vegetable compartment 6 are drawer type icemaker door 3a and upper freezer compartment door respectively The lower freezer room door 5a and the vegetable room door 6a are provided. Below, cold storage room door 2a, 2b, ice room door 3a, upper stage freezer room door 4a, lower freezer room door 5a, and vegetable room door 6a are only called door 2a, 2b, 3a, 4a, 5a, 6a. A door hinge for fixing the refrigerator 1 and the doors 2a and 2b is provided at the top of the refrigerator, and the door hinge is covered with a door hinge cover 53.

  FIG. 2: is AA sectional drawing of the refrigerator which concerns on this embodiment. The outside of the refrigerator 1 and the inside of the refrigerator 1 are separated by a heat insulating box 10 formed by filling a foam heat insulating material. A plurality of vacuum heat insulating materials 25 are mounted on the heat insulating box 10 of the refrigerator 1. The cold storage compartment 2 is separated from the upper freezing compartment 4 and the ice making room 3 by the heat insulating partition wall 28, and the lower freezing compartment 5 is separated from the vegetable compartment 6 by the heat insulating partition wall 29 in the same manner. The door interiors of the doors 2a and 2b are provided with a plurality of door pockets in the order of 33a, 33b and 33c from the top, and the refrigerator compartment 2 has a plurality of shelves from the top 34a, 34b, 34c, 34d and 34e (FIG. 3) ), It is divided into multiple storage spaces. The shelves 34a and 34b are shelves partially made of glass, and 34c, 34d and 34e are made of resin.

  At the lower part of the lowermost shelf 34e of the refrigerator compartment 2, a vacuum storage room 35 for storing food under reduced pressure is provided. A pressure reducing pump (not shown) is provided to reduce the pressure inside the pressure reducing storage chamber 35, and the door 56 of the pressure reducing storage chamber can be locked by the handle 55 in order to maintain the pressure inside. (See Figure 3). The temperature in the reduced pressure storage chamber 35 can be set from the outside, and it is cold air from the discharge port 38 (with an air volume adjustment device (damper)) provided on the back side of the reduced pressure storage chamber 35. The temperature is adjusted according to the temperature detected by the temperature sensor 45 provided on the back side of the sensor. In the present embodiment, although the reduced pressure storage room 35 is used, it may be a low temperature storage room (chilled room) which is divided by the lowermost shelf 34e and whose lowermost shelf 34e is a ceiling.

  Between the upper stage freezing room 4 and the lower stage freezing room 5, the heat insulation partition wall 40 of the freezing room is provided. Storage containers 3b, 4b, 5b and 6b are respectively provided integrally with the doors 3a, 4a, 5a and 6a provided in front of the respective cooling chambers in the upper stage freezing room 4, the lower stage freezing room 5 and the vegetable room 6. The storage containers 4b, 5b and 6b can also be pulled out by pulling out the doors 4a, 5a and 6a to the front side. A storage container is provided in the ice making chamber 3 integrally with the door 3a, and the storage container 3b can also be pulled out by pulling out the door 3a to the front side. The outside temperature sensor 52 is provided, for example, inside the door hinge cover 53 of the refrigerator 1.

  The cooler 7 is provided in the cooler storage chamber 8 provided substantially at the back of the lower stage freezing chamber 5, and cold air heat-exchanged with the cooler 7 by the internal fan 9 provided above the cooler 7 is a refrigeration chamber Cold room 2, upper stage freezing via cold air duct 11 (first cold air duct 11a and second cold air duct 11b), upper stage freezing room cold air duct 12, lower stage freezing room ventilation duct 13 and ice making room ventilation duct (not shown) It is sent to each storage room of room 4, lower freezer compartment 5 and icemaker 3 respectively.

  The blowing of the cold air to each storage room is controlled by the air volume adjustment device, that is, the opening and closing of the cold room twin dampers 20 (20a, 20b) and the freezing room damper 60. The refrigerator compartment twin damper 20 is a twin baffle type damper having two baffles 20a and 20b, and the motor drive unit 46 (see FIG. 3) adjusts the air volume by opening and closing the baffles.

  In the case of a cooling room cooling operation for cooling the cooling room 2, the cold room twin damper 20 is opened, the freezing room damper 60 is closed, and the cold room duct 11 passes through the blowout ports 30a, 30b, 30c, 30d, 31a, 31b. The cold air is sent to the refrigerator compartment 2 from. After circulating cold air in the refrigerator compartment 2, the cold air flows into a refrigerator compartment return port 39 (see FIG. 3) provided on the left or right side of the lower part of the refrigerator compartment, and then returned to the cooler 7. There are various methods for cooling the vegetable compartment 6, for example, a method of directly sending cold air to the vegetable compartment 6 after cooling the cold storage compartment 2, or cold air generated by the cooler 7 using a dedicated damper for the vegetable compartment Can be sent directly to the vegetable room 6. In the present embodiment, the method of supplying cold air to the vegetable compartment 6 may be any case. In the example shown in FIG. 2, the cold air which has flowed into the vegetable compartment 6 is provided from the vegetable compartment return port 18a provided in the lower front of the heat insulating partition 29 through the vegetable compartment return duct 18 from the vegetable compartment return discharge port 18b. It flows into the cooler 7.

  In the case of the freezing room cooling operation for cooling the freezing rooms 4 and 5 (including the ice making room 3), the cold room twin damper 20 is closed, the freezing room damper 60 is opened, and the cold air is the upper freezing room 4 and the lower freezing room 5 And, after cooling the ice making chamber 3, it is returned to the cooler 7 from the freezing chamber return port 17. There is also an operation of simultaneously cooling the refrigerator compartment 2 and the freezer compartments 4 and 5 in accordance with the temperature inside the refrigerator, in which case the refrigerator compartment twin damper 20 and the freezer compartment damper 60 are both opened to cool the storage compartments. Blow air.

  The first temperature sensor 43 detects the temperature of the area partitioned by the shelf 34b of the cold storage room and the ceiling surface, and the second temperature sensor detects the temperature of the area partitioned by the shelf 34b of the cold storage room and the lowermost shelf 34e 42, opening and closing of the baffles 20a, 20b of the refrigerator twin damper 20 according to the temperature detected by the third temperature sensor 45 etc. which detects the temperature of the area partitioned by the lowermost shelf 34e and the heat insulating partition 28 Control.

A defrost heater 22 is provided below the cooler 7. The drain water generated at the time of defrosting falls once to the weir 23, and is discharged to the evaporation pan 21 provided at the head of the compressor 24 through the drain hole 27. In the machine room 61 provided at the lower rear of the refrigerator, in addition to the compressor 24, a radiator and a fan (not shown) for heat radiation are arranged.
A control board 51 on which a memory and an interface circuit are mounted is disposed on the top surface of the ceiling wall of the refrigerator 1, and control of the refrigeration cycle and the air flow system is performed according to the control stored in the control board 51. The control substrate 51 is covered by a substrate cover 50.

  FIG. 3 is a front view of the inside of the refrigerator compartment 2 (the doors 2a and 2b are omitted), and FIG. 4 is a cross-sectional view of the refrigerator compartment in FIG. The cold storage duct 11 comprising the first cold duct 11a and the second cold duct 11b is connected to baffles 20a, 20b comprising two openings provided in the cold compartment twin damper 20, respectively. Specifically, the baffle 20a side having a large opening area in the refrigerator compartment twin damper 20 is folded to the first cold air duct 11a whose flow passage cross-sectional area is large and extends upward. And when cooling with the first cold air duct 11a, the baffle 20a is opened, and when the baffle 20b is closed, when cooling with the second cold air duct 11b, the baffle 20a is closed, baffle 20b is opened, and both ducts are cooled In the case, the baffles 20a and 20b are respectively opened. The cold air duct 11a is used to cool the upper part of the cold storage room, and the cold air duct 11b is used to cool the lower part of the cold storage room.

  The first cold air duct 11a is provided with outlets 30e, 30f, 30a and 30b in order from the top, and the cold air blown from the respective outlets is the ceiling surface 63 and the second stage shelf 34b. The food placed on the partitioned area 2A (see FIGS. 2 and 4), that is, the shelves 34a and 34b and the door pockets 33a and 33b is mainly cooled. The second cold air duct 11b is provided with outlets 30c and 30d, and the second stage from the top is the shelf 34b and the fourth from the top (the lowermost) shelf 34e with cold air blown from the respective outlets. The food placed in the area 2B (see FIGS. 2 and 4), that is, the shelves 34c, 34d and 34e is mainly cooled. A decompression storage room 35 and an ice making tank 36 are provided in a region 2C (see FIGS. 2 and 4) below the shelf 34e and commonly used by cold air from both the first cold air duct 11a and the second cold air duct 11b. It becomes an area | region which is easy to be cooled by the influence of the freezing temperature zone room provided with the cooling and the lower part of the refrigerator compartment 2. Moreover, as shown in FIG.

  A first temperature sensor 43 is provided in the area 2A of the refrigerator compartment 2, a second temperature sensor 42 is provided in the area 2B, and a third temperature sensor 45 is provided in the area 2C. For example, in the present embodiment, the first temperature sensor 43 is provided on the ceiling surface 63 of the refrigerator compartment 2. The second temperature sensor 42 is located between the shelves 34 d and 34 e, and is provided on a panel cover 30 which forms a cold room cold air duct 11 provided on the back side of the cold room 2. The third temperature sensor 45 is similarly provided on the panel cover 30, and the cold air blown from the outlets 30e, 30f, 30a, 30b of the first cold air duct 11a and the outlets 30c, 30d of the second cold air duct 11b is The temperature of the region 2C (the ambient temperature of the ice making tank 36 and the reduced pressure storage chamber 35) that commonly circulates is detected.

  FIG. 5 is an enlarged view of the cold room cold air duct 11 (first cold air duct 11a, second cold air duct 11b), and is a front view, respectively. 6 is a cross-sectional view taken along the line C-C in FIG. As shown in FIG. 5, the first cold air duct 11a is formed to a position higher than the second cold air duct 11b, and at least at the height of the upper end of the second cold air duct 11b, the width dimension of the first cold air duct 11a is It is wider than the width dimension of the second cold air duct 11b.

  Here, when the refrigerator compartment is cooled with a general refrigerator, the refrigerator compartment upper region 2A and the refrigerator compartment lower region 2B are simultaneously cooled. However, if food is supplied from outside the refrigerator only in one of the regions, the food already cooled in the other region will be further cooled, and there is a concern about freezing or deterioration of the quality. So, in this embodiment, based on the temperature detected by the 1st temperature sensor 43, the 2nd temperature sensor 42, and the 3rd temperature sensor 45, the 1st cold air duct 11a which cools the refrigerator compartment upper region 2A By switching the second cold air duct 11b for cooling the lower region 2B of the refrigerator compartment as appropriate, excessive cooling is suppressed to enhance energy saving.

  The flow of the cold air | gas of the refrigerator compartment 2 at the time of cooling with the 1st cold air | gas duct 11a by FIG. 7 is shown. When the baffle 20a of the refrigerator compartment twin damper 20 is opened (the baffle 20b is closed), cold air is discharged from the discharge ports 30a, 30b, 30e, and 30f provided in the first cold air duct 11a. The discharged cold air mainly cools the food in the area 2A where the shelves 34a and 34b and the door pockets 33a and 33b are arranged at the top stage, and then to the area 2C partitioned by the bottom shelf 34e and the heat insulating partition 28 It reaches and cools this space. When food is introduced into the area 2A, the first temperature sensor 43 detects a temperature increase in the area 2A, and the second temperature sensor 42 does not detect a temperature increase in the area 2B, the cold air duct 11a Implement a cooling pattern. In order to mainly cool only the newly introduced food in the area 2A, the food in the area 2B is not excessively cooled, and energy saving can be improved.

  On the other hand, FIG. 8 shows the flow of cold air of the refrigerator compartment 2 when it is cooled by the second cold air duct 11b. When the baffle 20b of the refrigerator compartment twin damper 20 is opened (the baffle 20a is closed), the cold air is discharged from the outlets 30c, 30d provided in the second cold air duct 11b. The discharged cold air mainly cools the food in the region B where the shelves 34c, 34d and 34e are disposed, and then reaches the region 2C divided by the lowermost shelf 34e and the heat insulating partition wall 28, and Do the cooling. When food is introduced into the region 2B, the first temperature sensor 43 does not detect the temperature increase in the region 2A, and the second temperature sensor 42 detects the temperature increase in the region 2B, cooling by the cold air duct 11b Implement the pattern. The area 2B can be efficiently cooled with respect to the cooling pattern in the cold air duct 11a.

  Furthermore, as shown in FIG. 9, if both the baffles 20a and 20b of the refrigerator compartment twin damper 20 are opened, a cooling pattern using both the first cold air duct 11a and the second cold air duct 11b can be implemented. If this cooling pattern is implemented, efficient cooling can be achieved even when food is simultaneously introduced into the regions 2A and 2B.

  In this embodiment, each temperature sensor is used to detect the temperature of each region in the refrigerator compartment, and the air volume adjustment device is controlled according to the detection result so that the temperature of each region becomes appropriate. It can be cooled. For this reason, it is possible to carry out cooling with enhanced energy saving without excessively cooling the already cooled region, and to obtain the effect of suppressing freezing of the food and deterioration of the quality.

  Further, in the refrigerator according to the present embodiment, the fourth temperature sensor for detecting the input of food into the lower part of the refrigerator compartment separately from the first temperature sensor 43, the second temperature sensor 42, and the third temperature sensor 45 described above. A temperature sensor (food detection sensor) 48 is provided.

  As shown in FIG. 3, the food detection sensor 48 is located between the shelf 34e immediately above the reduced pressure storage room 35 and the next shelf 34c as the height position, and from the left and right center as the left and right direction position. Also on the side with the cold room return port 39. More specifically, the position between the cold air return port 39 and the discharge port 30 d for cooling the lower part of the refrigerator compartment provided between the lowermost shelf 34 e and the upper shelf 34 c is preferable as a more specific left-right position. The discharge port 30d is unevenly distributed to one side (right side in the present embodiment) from the left and right center of the panel cover 30, and the cold air return port 39 is also one side below the lowermost shelf 34e (from the center in the present embodiment) Formed on the right).

  Therefore, a rapid cooling corner (region 2D in FIG. 3) from the center between at least the lowermost shelf 34e and the upper shelf 34d, which is a cold air passage from the discharge port 30d to the cold air return port 39, By doing this, the cooling efficiency can be enhanced. Then, in the present embodiment, by disposing the food detection sensor 48 between the discharge port 30 d and the cold air return port 39, it is accurately detected that warm food is placed in the rapid cooling corner, and is automatically performed. You can start quick cooling. If the aluminum tray is disposed at the rapid cooling corner, the user can easily recognize that the space is for rapid cooling.

  Since the second cold air duct 11b is provided with the discharge port 30c just below the shelf 34b near the middle height of the refrigerator compartment 2, the space between the shelves 34c and 34d and the shelf 34b (see FIG. Region 2E of 3 can also be a target space for rapid cooling. Here, the food detection sensor 48 is located immediately below the shelf 34 c and can detect even when food is placed in the space above the shelf 34 c. Further, in the region 2E, since there is no member separating the left and right, a wider space can be targeted for rapid cooling compared to the region 2C.

  Here, the control of automatic rapid cooling by the food detection sensor 48 will be described with reference to FIGS. 15 and 16. First, it is determined whether the setting of the automatic rapid cooling mode is ON (step S1). When the opening / closing operation of the doors 2a and 2b is performed in step S2 when the setting of the automatic rapid cooling mode is ON, the state shifts to a monitoring state for determining whether or not rapid cooling is permitted. In step S3, if the food detection sensor 48 maintains a state of the rapid cooling permission judgment threshold or more for a certain period of time (the rapid cooling start judgment time) after shifting to the monitoring state, it is considered that the food is put into the lower part of the refrigerator compartment 2. Start rapid cooling. Here, the rapid cooling permission determination threshold value is set to a value higher by a constant temperature than the temperature detected by the food detection sensor 48 when the doors 2a and 2b are closed.

  When the rapid cooling is started, the compressor 24 is rotated at high speed (2000 rpm to 4000 rpm), and both the baffle 20a for the first cold air duct 11a and the baffle 20b for the second cold air duct 11b are opened. Cold air is supplied to both the upper and lower portions of 2, and the whole of the refrigerator compartment 2 is cooled first. Thereafter, when the temperature detected by the food detection sensor 48 becomes equal to or lower than a predetermined threshold (the threshold of the baffle 20a), the baffle 20a of the first cold air duct 11a is closed. At this time, cold air is supplied only from the second cold air duct 11b, but since the second cold air duct 11b has an outlet only at the lower part of the refrigerator compartment 2, areas 2D and 2E which are the lower part of the refrigerator compartment 2 are concentrated Cool down.

  Next, when the value detected by the food detection sensor 48 becomes equal to or less than a predetermined threshold (baffle 20 b threshold) lower than the baffle 20 a threshold, the baffle 20 b of the second cold air duct 11 b is also closed, and the compressor 24 rotates. To stop rapid cooling. The timing at which the baffle 20a and the baffle 20b are closed may be determined based on whether or not a predetermined time has elapsed since the start of the rapid cooling (step S4).

  As described above, in the present embodiment, the first cold air duct 11 a mainly cools the upper part when the food detection sensor 48 detects that the food is put into the lower part of the refrigerator after opening and closing the doors 2 a and 2 b. After supplying cold air using both the second cold air duct 11b mainly cooling the lower part and cooling the entire cold storage room first, cold air is supplied using only the second cold air duct 11b to lower the cold room Cool intensively. In particular, in the present embodiment, from the total of the opening areas of the discharge ports 30e, 30f, 30a, 30b provided in the first cold air duct 11a, the opening areas of the discharge ports 30c, 30d provided in the second cold air duct 11b. Since the sum is smaller, the wind speed of the cold air supplied to the rapid cooling corner at the lower part of the refrigerator compartment 2 is increased, and this space can be effectively cooled. In the case where cooling using only the second cold air duct 11b is performed immediately after opening and closing the doors 2a and 2b, the food in the lower part is also less likely to cool because the high temperature of the entire refrigerator compartment is affected. As described above, cooling is first performed using both ducts.

  As a result, even if the hot pot is stored in the lower part of the refrigerator compartment, it is possible to suppress the temperature rise of the food around the pan product in the lower part of the refrigerator compartment to prevent the deterioration. In addition, excessive cooling of the upper part of the refrigerator far from the hot pot can be suppressed, and power consumption can be reduced.

  Here, even in the cooling pattern in FIG. 8 described above, cooling by the second cold air duct 11b has been described, but in the cooling pattern of FIG. 8, the second temperature sensor 42 for detecting the internal temperature of the lower part of the refrigerator compartment , And the rotational speed of the compressor 24 is also low. On the other hand, in the automatic rapid cooling pattern, the food detection sensor 48 provided in the vicinity of the rapid cooling corner in the lower part of the refrigerator compartment is used to control and increase the rotational speed of the compressor 24 to high speed rotation. There is. For this reason, it is possible to accurately detect the input of warm food, and to cool the food quickly and effectively.

  It should be noted that automatic cooling is not only performed automatically when food is introduced to the lower part of the refrigerator compartment 2, but when the user sets it by selection with a control panel etc., regardless of presence or absence of food detection, The lower part may be forcibly cooled rapidly.

  Next, the operation of lower-stage cooling, in which the temperature in the lower part of the refrigerator compartment 2 is kept 2 ° C. or more lower than the temperature in the upper part of the refrigerator compartment 2 using each temperature sensor and each cold air duct, will be described . The lower cooling can be set to ON / OFF by the control panel, and when this operation is set to ON, the open state of the baffle 20b is longer (the open state of the baffle 20a than in the case where the operation is not set) Increase the ratio of the open time of the baffle 20b to the time). Specifically, unlike in the case of the OFF setting, there is provided a time during which only the baffle 20b is open when the baffle 20a is closed. However, the rotational speed of the compressor 24 during the operation of the lower cooling is maintained at a low speed (1000 rpm to 2000 rpm) as compared with the case of the rapid cooling.

  Next, control when lower stage cooling is set to ON will be described with reference to FIG. In the lower-stage cooling operation, the compressor 24 is stopped when a predetermined time has elapsed or when the temperature detected by the second temperature sensor 42 becomes equal to or higher than a predetermined threshold (baffle open threshold). While rotating at low speed, both baffles 20a and 20b are opened. Thereafter, when the temperature detected by the second temperature sensor 42 becomes equal to or lower than a predetermined threshold (the threshold for the baffle 20a), the baffle 20a is closed. Furthermore, when the temperature detected by the second temperature sensor 42 becomes equal to or less than a predetermined threshold (the baffle 20 b threshold), the baffle 20 b is also closed.

  Even in a common refrigerator, low-temperature air in the refrigerator compartment tends to collect downward, and temperatures tend to be lower in the refrigerator compartment than in the upper compartment, but according to this embodiment, the upper and lower temperatures are more differentiated Even if the temperature range suitable for storage is different from food, it becomes possible to select storage locations separately. In particular, since the lower part of the refrigerator compartment is kept at a low temperature as compared with a general refrigerator, when the vacuum storage room 35 for low temperature storage is full of food, the space in the lower part of the refrigerator compartment can be used instead and usability is Get better. When the lower stage cooling is set to OFF, the control is as shown in FIG. 18, and the dampers 20a and 20b always open both at the same timing and always close at the same timing.

  Next, the configuration of the cold room cold air duct 11 will be described in detail. As shown in FIG. 10, the first cold air duct 11a and the second cold air duct 11b in the present embodiment are configured by a panel cover 30, a flow path forming member 41, a seal member 62, a damper cover 32, and the like.

  First, the panel cover 30 is made of synthetic resin, and has a base portion 30v in which a refrigerator compartment damper is accommodated, and a vertical portion 30u extending vertically upward from the base portion 30v. On the side of the vertical portion 30 u of the panel cover 30 facing the refrigerating chamber, a plurality of front concave portions 30 w are formed at different height positions corresponding to the discharge ports 30 a to 30 d. And this panel cover 30 is arrange | positioned in the left-right direction center of the back side of the refrigerator compartment 2. As shown in FIG. Further, two discharge ports 30e and 30f are formed on the upper end of the panel cover 30, and it is possible to direct cold air from the discharge ports 30e and 30f on the ceiling side to the top door pocket 33a. It is.

  FIG. 11 is a perspective view of the panel cover 30 as viewed from the back (rear) side. On the back surface side of the panel cover 30, a guide convex portion 30t is formed at a position corresponding to the above-described front concave portion 30w. Cold air flow inlets 30t0 are formed on the lower surfaces (upstream side surfaces) of the guide convex portions 30t, respectively. Cold air flowing into the guide convex portions 30t from the cold air flow inlets 30t0 is the upper wall surface of the front concave portion 30w Is guided to the front side in the refrigerator compartment 2 through the

  Next, the flow path forming member 41 will be described. The flow path forming member 41 is formed by cutting expanded polystyrene or the like, and as shown in FIG. 10, the lower flow path portion 41v fitted to the base portion 30v of the panel cover 30 and the vertical of the panel cover 30 And a main body flow passage portion 41x fitted to the portion 30x. The lower flow passage portion 41v is attached with the refrigerator compartment twin damper 22 and is in communication with a part of the first cold air duct 11a communicating with the baffle 22a of the refrigerator compartment twin damper 22 and the baffle 20b of the refrigerator compartment twin damper 22 And a part of the two cold air ducts 11b.

  Further, in the main flow path portion 41x of the flow path forming member 41, a plurality of cutout holes 41h are formed at positions different in height. Specifically, the notch hole 41h1 for the first cold air duct 11a is formed at the highest position and a position one step lower, and the second cold air is formed at the lowest position and a position higher than that. A notch hole 41h2 for the duct 11b is formed. Here, the width dimension of the cutout hole 41h1 formed on the upper side is larger than that of the cutout hole 41h2 formed on the lower side. This is because the width area in which the discharge ports 30a and 30b above the first cold air duct 11a are formed is wider than the width area in which the discharge ports 30c and 30d of the second cold air duct 11b are formed.

  Note that, as shown in FIG. 12, a flow straightening portion 41k, which is a protruding piece extending in the vertical direction, is provided between the plurality of notch holes 41h1 located on the upper side and adjacent to each other. The rectifying portion 41k functions to guide the cold air from the upstream side upward and to effectively flow the cold air from the outlets 30e and 30f on the ceiling side to the door pocket 33a. Further, the rectifying portion 41k also has an effect of reinforcing the flow path forming member 41 in a portion sandwiched by the notch holes 41h1 and an effect of preventing the deflection of the seal member 62.

  Further, a first groove portion 41ua and a second groove portion 41ub are formed on the back surface (back surface) side of the flow path forming member 41, and between the seal member 62, the first cold air duct 11a and the second cold air, respectively. It comprises the duct 11b. In the first groove portion 41ua, an extending wall 11aa extending in the vertical direction is formed on one end side (right side in FIG. 12) in the left-right direction, and on the other end side (left side in FIG. 12) in the left-right direction A wall 11 aa extending to a high predetermined position, and a wide wall 11 ab extending linearly or in an arc toward the ceiling are formed on the downstream side of the wall 11 aa. As a result, in the first cold air duct 11a, the upstream portion at the height to be juxtaposed with the second groove portion 41ub, the flow path enlargement portion gradually expanding the flow path cross-sectional area, and the flow path cross-sectional area than the upstream portion And the downstream part where the Here, the vertical projection of the baffle 20a of the first cold air duct 11a and the vertical projection of the discharge port 30e have a positional relationship in which at least a part thereof overlaps. Accordingly, the cold air flowing from the baffle 20a on the lower end one side (left) of the panel cover 30 does not receive a large air flow resistance, and is directed toward the discharge port 30e on the upper end one side (left) of the panel cover 30. Since it flows, cold air can be efficiently blown into the refrigerator compartment 2.

  Furthermore, on the back side of the downstream portion of the flow path forming member 41, a branch portion 41v that branches the cold air in the first cold air duct 11a in the left and right direction is formed, and the cold air after branching is discharged from the discharge ports 30e and 30f. It flows to the groove outlets 41h3 and 41h4 provided at the upper end of the flow path forming member 41 corresponding to the above. Thereby, cold air can be efficiently supplied to the uppermost door pocket 33a in the left and right doors 2a, 2b.

  FIG. 13 is an enlarged perspective view of the vicinity of the height of the shelf 34 b in the second stage in a state in which the flow path forming member 41 is fitted to the back surface of the panel cover 30. The cold air flowing from the upstream side to the downstream side in the space surrounded by the inner surface of the groove portion 41u of the flow path forming member 41 and the inner surface of the sealing member 62 gradually dents (becomes deeper) to the front side as it goes downstream Thus, it is guided to the cold air flow inlet 30t0 of the panel cover 30. Thus, the height of the guide convex portion 30t can be reduced by providing the inclined portion 41s on the wall surface of the flow path forming member 41 located upstream of the cold air flow inlet 30t0, and the ventilation resistance in the duct by the guide convex portion 30t. It is possible to suppress the influence of The vertical dimension of the inclined portion 41s is smaller than the vertical dimension of the cutout hole 41h, thereby suppressing the thickness reduction of the flow path forming member 41 accompanying the formation of the inclined portion 41s and preventing the deterioration of the heat insulation performance. It is possible.

  Here, although a plurality of cold air flow inlets 30t0 are formed in the left-right direction on the upstream side surface of the guide convex portion 30t, since the partition wall 30t2 is provided between the adjacent cold air flow inlets 30t0, the width substantially In addition to forming a wide discharge port, it is possible to prevent the entry of dust while securing the strength of the panel cover 30. In addition, not only the discharge port 30b but the discharge ports 30a, 30c, and 30d have the same configuration.

  In addition, the flow path forming member 41 has a curved shape in which the central portion bulges to the front side in the left-right direction. For this reason, it is possible to expand the flow passage cross-sectional area of the cold air duct formed by the flow passage forming member 41 and the seal member 62. Similarly, the horizontal cross section of one panel cover 30 is curved. For this reason, it is easy to spread cold air radially from the panel cover 30 into the refrigerating chamber 2 and discharged, and the inside of the refrigerating chamber 2 can be efficiently cooled.

  Furthermore, as shown in FIG. 14, the downstream inner wall surface (upper wall surface of the front recess 30w1) 30t1 of the guide convex portion 30t of the panel cover 30 also has a curved surface. For this reason, cold air which has flowed from the inclined portion 41s of the flow path forming member 41 through the cold air flow inlet 30t0 into the guide convex portion 30t is guided forward while suppressing the air flow resistance, and contributes to the improvement of the cooling efficiency.

  In the present embodiment, the front concave portions 30w facing the cold storage side (front side) apparently correspond to the discharge ports 30a to 30d. However, since cold air is actually discharged in the region where the cold air flow inlet 30t0 exists, when referring to the opening area of each of the discharge openings 30a to 30d, it refers to the total area of the cold air flow inlets 30t0.

  The seal member 62 is a plate-like member formed of a synthetic resin material or the like, and is disposed so as to cover the entire first groove portion 41ua and the second groove portion 41ub of the flow path forming member 41. Moreover, by connecting to the inner box 47 using the sealing member 62, it is possible to install a cold air duct on the back side of the refrigerator compartment.

  The following effects can be obtained by the configuration of the present embodiment described above.

  First, for the first cold air duct 11a where the ventilation resistance becomes large due to the long flow path, the cross-sectional area of the flow path is made larger than the second cold air duct 11b, so that the ventilation resistance until the cold air reaches the downstream is taken as a whole. As a result, cold air can be efficiently blown to the upper space of the refrigerator compartment 2, and energy saving can be improved.

  Next, on the inside of the wall surface forming the front side of the cold air duct 11, a guide convex portion 30t extending horizontally and receiving cold air extending from the upstream side is formed, and on the upstream side wall surface (lower surface) of the guide convex 30t. Since the cold air flow inlet 30t0 is formed, cold air in the cold air duct 11 can be drawn in efficiently. In addition, cold air flowing from the cold air flow inlet 30t0 is guided to the front side in the refrigerating chamber 2 through the inside of the guide convex portion 30t and the upper wall surface of the front concave portion 30w. As a result, the flow rate of the discharged cold air is increased, thereby improving the cooling efficiency.

  Moreover, since the discharge port is formed so as to penetrate the lower surface of the guide convex portion 30t in the vertical direction, it is difficult for the user to recognize the discharge port even when the inside of the refrigerator compartment 2 is viewed from the front side. Design will be improved. The lower surface of the guide convex portion 30t is not limited to horizontal, and if it is closer to the horizontal direction than the vertical direction, the effect of making the discharge port difficult to see and the effect of increasing the discharge air volume can be achieved to a certain extent.

  Furthermore, since the horizontally long rectangular front concave portions 30w located at different heights have the same width regardless of the size of the width area of the discharge port, the user does not have a sense of discomfort, and the design can be kept high. In addition, the width dimension of each front surface recessed part 30w may be in the range of 90%-110% not only in exact same.

  Further, in the present embodiment, the discharge port formed on the front side of the first cold air duct 11a is wider than the discharge port formed on the front of the second cold air duct 11b. Can supply cold air to increase cooling efficiency. And, since the first cold air duct 11a extending to a higher level than the second cold air duct 11b forms all the discharge ports 30a, 30b at a position higher than the discharge port 30c at the top of the second cold air duct 11b. , It is possible to concentrate on the upper part of the refrigerator compartment 2 to supply cold air, and the cooling efficiency is enhanced.

  On the other hand, the upper end of the second cold air duct 11 b is at a position lower than half of the height of the refrigerator compartment 2, and all the discharge ports of the second cold air duct 11 b are also lower than half of the height of the refrigerator compartment 2 It is in. Therefore, when the baffle 20b is opened while closing the baffle 20a of the refrigerator compartment twin damper 20, cold air can be concentrated and supplied to the lower part of the refrigerator compartment 2, so when warm food is introduced into the lower part of the refrigerator compartment 2. Rapid cooling or lower cooling that keeps the lower part of the refrigerator compartment 2 cooler than the upper part is possible. Here, the space below half of the height of the refrigerator compartment 2 corresponds to a slightly higher position with respect to the heat insulating partition wall 28 close to the waistline of the average user, and the frequency of use is high. It is effective to make the target of rapid cooling and lower stage cooling. In particular, when the lower part of the refrigerator compartment 2 is kept at 2 ° C. or lower, the long-term storage stability of the prepared food and the like is significantly improved. In addition, even if warm food is introduced into a part of the space of the refrigerator compartment 2, the space is rapidly cooled, so it is possible to suppress an increase in the temperature of other spaces, and as a result, the preservation of the entire refrigerator compartment 2 is also enhanced. .

Reference Signs List 1 refrigerator, 2 refrigerator, 2a, 2b refrigerator door, 3 ice chamber, 3a ice chamber door, 3b storage container, 4 upper freezer chamber, 4a upper freezer door, 4b storage container, 5 lower freezer chamber, 5a lower freezer Room door, 5b storage container, 6 vegetable room, 6a vegetable room door, 6b storage container, 7 cooler, 8 cooler storage room, 9 internal storage fan, 10 heat insulation box, 11 cold storage room cold air duct, 11a first cold air Duct, 11aa first cold air duct extended wall, 11ab first cold air duct widening wall, 11b second cold air duct, 12 upper cold room cold air duct, 13 lower cold room cold air duct, 17 cold room return port, 18 vegetable room Return Duct, 18a Vegetable Room Return, 18b Vegetable Room Return, 20 Cold Room Twin Damper, 20a Baffle, 20b Baffle, 21 Evaporative Tray, 22 Defrost Heater 23 樋, 24 compressor, 25 vacuum heat insulating material, 27 drain hole, 28, 29, 40 heat insulating partition wall, 30 panel cover, 30a, 30b, 30c, 30d, 30e, 30f Discharge port, 30t guide convex portion, 30w front surface Recesses, 33a, 33b, 33c Door pockets, 34a, 34b, 34c, 34d, 34e Shelf, 35 reduced pressure storage room, 36 ice making tank, 39 cold storage room return port, 41 flow path forming member, 41h notch hole, 41h straightening part, 41s inclined portion, 41v branch portion, 42 second temperature sensor, 43 first temperature sensor, 45 third temperature sensor, 46 motor drive unit, 47 back cover, 48 food detection sensor, 50 substrate cover, 51 control substrate , 52 outside temperature sensor, 53 door hinge cover, 55 handle, 56 vacuum storage room door, 60 freezer room Pa, 61 machine room 62 seal member, 63 a ceiling surface

Claims (4)

Storage room of refrigerated temperature zone,
A first cold air duct and a second cold air duct provided on the back side of the storage room;
A refrigerator comprising: a blower for blowing cold air from below to the first cold air duct and the second cold air duct;
The first cold air duct is formed to a position higher than the second cold air duct,
At least the height of the upper end of the second cold air duct, the width dimension of the first cold air duct is wider than the width dimension of the second cold air duct.   The refrigerator according to claim 1, wherein the outlet formed in the first cold air duct is wider than the outlet formed in the second cold air duct. The first cold air duct and the second cold air duct are configured using a panel cover,
The panel cover has a plurality of front concaves at a height position corresponding to the discharge port on the side facing the storage chamber,
The refrigerator according to claim 2, wherein the plurality of front recesses have the same width.   The refrigerator according to any one of claims 1 to 3, wherein the discharge port is not provided in the height range of the second cold air duct among the first cold air duct.

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