TWI678506B - refrigerator - Google Patents

Abstract

In order to provide a refrigerator, the lower part of the storage room is lowered in temperature, and the temperature difference between the upper part and the lower part of the storage room is increased, thereby improving the usability of the storage room. A refrigerator includes a storage room in a refrigerated temperature zone, a cold air passage provided on the back side of the storage room, and a blowing means for sending cold air toward the cold air passage; the cold air passage includes: The first cold air passage cooled by the upper part and the second cold air passage mainly cooled by the lower part of the storage compartment; when it is a predetermined setting, compared with the case where it is not a predetermined setting, the cold air of the second cold air passage is set. The ratio of the supply time to the cold air supply time of the first cold air passage is increased.

Description

refrigerator

The present invention relates to a refrigerator.

One type of refrigerator technology has been proposed. It uses temperature detection to appropriately detect the temperature in the storage room, thereby improving the preservation and reliability of food, and providing a refrigerator with high energy efficiency. For example, in the refrigerator described in Patent Document 1 described below, a first air-conditioning passage and a second air-conditioning passage are formed, and each passage is used to supply cold air to a predetermined area in a storage room. [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-40967

[Problems to be Solved by the Invention] 的 The refrigerator described in the above Patent Document 1 appropriately supplies the cold air of the two cold air passages based on the detection results of the temperature sensors installed in the upper and lower parts of the refrigerator compartment. Switch. However, the refrigerator described in Patent Document 1 is controlled to prevent excessive cooling or high temperature, and the temperature difference between the upper part and the lower part in the refrigerating room is kept small. The present invention has been developed in view of the above problems, and an object thereof is to provide a refrigerator that lowers the lower part of a storage room and increases the temperature difference between the upper and lower parts of the storage room, thereby improving the storage room. Usability. [Technical Means for Solving the Problem] 具备 A refrigerator includes a storage room in a refrigerated temperature zone, a cold air passage provided on a back side of the storage room, and an air supply means for sending cold air toward the cold air passage; the cold air passage has : A first air-conditioning channel mainly cooling the upper part of the storage room, and a second air-conditioning channel mainly cooling the lower part of the storage room; when it is a predetermined setting, compared with a case where it is not a predetermined setting, The ratio of the cold air supply time of the second cold air passage to the cold air supply time of the first cold air passage is increased. [Effects of the Invention] A refrigerator can be provided to lower the temperature of the lower part of the storage room and increase the temperature difference between the upper part and the lower part of the storage room. Even if the food is stored in different temperature zones, users can still be in the same storage room. Choose a storage location.

According to an embodiment of the present invention, Use drawings for illustration.  FIG. 1 shows the appearance of a refrigerator in this embodiment. As shown in Figure 1, The refrigerator 1 of this embodiment, From the top in order from the refrigerator compartment 2, Ice making room 3, Upper freezer compartment 4, Lower freezer compartment 5, The fruit and vegetable room 6 is composed. The refrigerator compartment 2 is provided with a refrigerator compartment door 2a divided into left and right sides, 2b, Ice making room 3, Upper freezer compartment 4, Lower freezer compartment 5, The fruit and vegetable room 6 is provided with: Drawer-type ice-making room door 3a, Upper freezer door 4a, Lower freezer door 5a, Fruit and vegetable room door 6a. the following, Put the refrigerator compartment door 2a, 2b, Ice room door 3a, Upper freezer door 4a, Lower freezer door 5a, Fruit and vegetable room door 6a is referred to as door 2a, 2b, 3a, 4a, 5a, 6a. For fixing refrigerator 1 and door 2a, The door hinge of 2b is set on the upper part of the refrigerator, The door hinge is covered with a door hinge cover 53.  FIG. 2 is a cross-sectional view taken along the line A-A of the refrigerator of this embodiment. The outside and inside of the refrigerator 1 are separated by an insulated box 10, The heat insulation box 10 is formed by filling a foamed heat insulation material. A plurality of vacuum heat insulating materials 25 are installed in the heat insulation box 10 of the refrigerator 1. The refrigerating compartment 2 is separated from the upper freezing compartment 4 and the ice-making compartment 3 by a heat insulation partition wall 28, In addition, The same use of thermal insulation partition wall 29, The lower freezing compartment 5 and the fruit and vegetable compartment 6 are separated. At door 2a, 2b inside the box, There are a plurality of door pockets 33a in order from the top, 33b, 33c, Refrigerator compartment 2, By sequentially placing the shelves 34a, 34b, 34c, 34d, 34e (refer to FIG. 3) is divided into a plurality of storage spaces by a plurality of shelves. In addition, Shelves 34a, 34b is a shelf made of glass, Shelves 34c, 34d, 34e is made of resin.  设置 Set below the lowermost shelf 34e of the refrigerating compartment 2: A reduced-pressure storage room 35 that stores food under reduced pressure. In order to reduce the pressure inside the decompression storage chamber 35, a decompression pump (not shown) is provided, To maintain internal pressure, The door 56 of the decompression storage chamber is configured to be locked by a handle 55 (see FIG. 3). The temperature in the decompression storage chamber 35 can be set from the outside, Utilizing cold air from a discharge port 38 (with an air volume adjustment device (damper)) provided on the back side of the decompression storage room 35 The temperature is adjusted based on the temperature detected by the temperature sensor 45 provided on the back side of the decompression storage chamber 35. Although this embodiment is configured as a decompression storage room 35, However, it can also be constructed as a low-temperature storage room (chilled room) without decompression, The low-temperature storage room is formed by partitioning the lowermost shelf 34e, and the lowermost shelf 34e is used as a top surface. A heat insulation partition wall 40 of the freezing chamber is provided between the upper freezing chamber 4 and the lower freezing chamber 5. In the upper freezer compartment 4, The lower freezer compartment 5 and the fruit and vegetable compartment 6 are respectively set up: With the door 3a provided in front of each cooling chamber, 4a, 5a, 6a is formed as a unified storage container 3b, 4b, 5b, 6b, With the door 4a, 5a, 6a pull out to the side of the hand, The storage container 4b, 5b, 6b pulled out. The ice-making compartment 3 is also provided with a storage container integrally formed with the door 3a, By pulling the door 3a out to the side, The storage container 3b can also be pulled out. In addition, Out-of-box temperature sensor 52, It is provided inside the door hinge cover 53 of the refrigerator 1, for example.  Cooler 7 is set at: The cooler accommodating room 8 disposed on the substantially back of the lower freezer compartment 5, With an in-box fan 9 provided above the cooler 7, Cold air after heat exchange with the cooler 7, Through the refrigerating compartment cold air passage 11 (the first cold air passage 11a, Second air-conditioning channel 11b), Upper freezer cold air passage 12, Lower freezer air supply channel 13 and ice making room air supply channel (not shown), Delivered to the refrigerated room 2, respectively Upper freezer compartment 4, Lower freezer compartment 5, Each storage room of the ice making chamber 3.  冷 The cooling air supply to each storage room, Is through the air volume adjustment device, That is, the twin damper of the refrigerator compartment 20 (20a, 20b) and opening and closing of the freezer door 60 are controlled. Refrigerator double air door 20, It has 2 baffle 20a, 20b double flap type damper, The motor drive unit 46 (see FIG. 3) opens and closes the shutter to adjust the air volume.  冷却 In the case of a cooling operation in which the refrigerating compartment 2 is cooled, Is to open the double door 20 of the refrigerator and close the door 60 of the freezer, From the air outlet 30a via the refrigerating compartment cold air passage 11, 30b, 30c, 30d, 31a, 31b blows cold air toward the refrigerator compartment 2. After the cold air is circulated in the refrigerating compartment 2, Let cold air flow into the refrigerating compartment return openings 39 (see FIG. 3) provided on the left and right sides of the lower part of the refrigerating compartment Then return to the cooler 7. There are various methods for cooling the fruit and vegetable room 6, Considerable methods are, for example: Method for directly blowing cold air to the fruit and vegetable room 6 after cooling the refrigerating room 2, A method of directly blowing the cold air generated in the cooler 7 to the vegetable and fruit room 6 by using a dedicated damper for the vegetable and fruit room. In this embodiment, Regarding the method of supplying the air-conditioning to the fruit and vegetable room 6, it may be any case. In the example shown in Figure 2, The cold air after flowing into the fruit and vegetable room 6, Is from the vegetable and fruit room return opening 18a provided in front of the lower part of the heat insulation partition wall 29 through the vegetable and fruit room return passage 18, On the other hand, it returns from the fruit and vegetable compartment to the spout outlet 18b and flows into the cooler 7.  In the freezer 4, 5 (including ice-making chamber 3) in the case of cooling operation of the freezing chamber, Is to close the double door 20 of the refrigerator compartment and open the freezer door 60, Let the air-conditioning cool the upper freezer compartment 4. After the lower freezing compartment 5 and the ice-making compartment 3 are cooled, It returns to the cooler 7 from the freezer compartment return port 17. According to the temperature inside the box, There will also be refrigerator compartment 2 and freezer compartment 4, 5 cooling operation at the same time, In this case, both the refrigerator compartment double damper 20 and the freezer compartment damper 60 are opened to blow cool air to each storage compartment.  Corresponds to the first temperature sensor 43, Second temperature sensor 42, The temperature detected by the third temperature sensor 45 and the like, To control the baffle 20a of the double door 20 of the refrigerator compartment, Opening and closing of 20b. The first temperature sensor 43 detects the temperature of the area defined by the shelf 34b and the top surface of the refrigerating compartment, The second temperature sensor 42 detects the temperature of the area defined by the shelf 34b and the lowermost shelf 34e of the refrigerator compartment. The third temperature sensor 45 detects the temperature of the area defined by the lowermost shelf 34e and the heat insulation partition wall 28.  设置 A defrosting heater 22 is provided at the lower part of the cooler 7. The drainage generated during defrosting first falls to the aqueduct 23, The drain hole 27 is discharged to an evaporation pan 21 provided on the head of the compressor 24. In a machine room 61 provided at the lower part of the back of the refrigerator, In addition to the compressor 24, a radiator and a fan (not shown) for heat radiation are arranged.  配置 Arrange a control substrate 51 on the upper surface of the top wall of the refrigerator 1, A memory is mounted on the control board 51, Interface circuit, Control of the refrigeration cycle and the air supply system is performed based on the control stored in the control board 51. The control substrate 51 is covered with a substrate cover 50.  Figure 3 is a front view of the interior of the refrigerating compartment 2 (the door 2a, 2b omitted), Fig. 4 is an enlarged B-B sectional view of the refrigerating compartment of Fig. 3; The refrigerating compartment cold air passage 11 constituted by the first cold air passage 11a and the second cold air passage 11b, The baffles 20a, 2 formed by two openings provided in the double door 20 of the refrigerator compartment are connected to 20b. in particular, The side of the baffle 20a with a larger opening area in the double door 20 of the refrigerator compartment, It is connected to the first cold air passage 11a which has a large cross-sectional area of the flow path and extends upward. and, In the case of cooling by the first cold air passage 11a, The baffle 20a is opened and the baffle 20b is closed; In the case of cooling by the second cold air passage 11b, The shutter 20a is closed and the shutter 20b is opened; In addition, In the case of cooling on both sides, Is the baffle 20a, 20b are all open. When cooling the upper part of the refrigerating compartment, a cold air passage 11a is used, The cold air passage 11b is used when cooling the lower part of the refrigerator compartment.  吐 The first cooling air passage 11a is provided with discharge ports 30e, 30f, 30a, 30b, Using the cold air sent from each outlet, It is mainly placed in the area 2A divided by the top surface 63 and the shelf 34b in the second stage (see FIG. 2). 4) food, That is, it is placed on the shelf 34a, 34b, Door shelf 33a, 33b Food.  吐 The second cooling air passage 11b is provided with a discharge port 30c, 30d, Using the cold air sent from each outlet, It is mainly placed in the area 2B defined by the shelf 34b in the second stage from the top and the shelf 34e in the fourth (lowest) stage from the top (see FIG. 2) 4) food, That is, it is placed on the shelf 34c, 34d, 34e food. In the area 2C lower than the shelf 34e (see FIG. 2) 4) Set up a decompression storage room 35, Ice making water tank 36, The cold air from both the first cold air passage 11a and the second cold air passage 11b is cooled together, Furthermore, it becomes an area which is easily cooled by the influence of the freezing temperature zone room provided in the lower part of the refrigerator compartment 2.  设置 Set the first temperature sensor 43 in the area 2A of the refrigerating compartment 2, A second temperature sensor 42 is provided in the area 2B, A third temperature sensor 45 is provided in the area 2C. E.g, In this embodiment, The first temperature sensor 43 is disposed on the top surface 63 of the refrigerator compartment 2. The second temperature sensor 42 is located between the shelves 34d and 34e, And provided on a panel cover 30, The cover plate 30 is provided on the back side of the refrigerating compartment 2 and forms a refrigerating compartment cold air passage 11. The third temperature sensor 45 is also disposed on the cover plate 30. For detecting the outlet 30e from the first cold air passage 11a, 30f, 30a, 30b and the outlet 30c of the second cold air passage 11b, Zone 2C (Cooling Water Tank 36, The temperature of the decompression storage chamber 35).  FIG. 5 shows the cold air passage 11 (the first cold air passage 11a, An enlarged front view of the second cooling air passage 11b). In addition, Fig. 6 is a sectional view taken along the line C-C in Fig. 5. As shown in Figure 5, The first cold air passage 11a extends to a higher position than the second cold air passage 11b, At least to the height of the upper end of the second cooling air passage 11b, The width dimension of the first cooling air passage 11a is wider than the width dimension of the second cooling air passage 11b.   here, When a refrigerator is cooled in a refrigerator, The refrigerator compartment upper region 2A and the refrigerator compartment lower region 2B are simultaneously cooled. however, When food is placed from outside the refrigerator in only one area, Food that has been cooled in another area will be further cooled, And there are freezes, Doubts about quality deterioration. then, In this embodiment, Is based on the first temperature sensor 43, The temperatures detected by the second temperature sensor 42 and the third temperature sensor 45, The first cold air passage 11a cooling the upper refrigerated compartment area 2A and the second cold air passage 11b cooling the lower refrigerated compartment area 2B are appropriately switched This suppresses excessive cooling and improves energy efficiency.  FIG. 7 shows the flow of the cold air in the refrigerator compartment 2 when the first cold air passage 11a is used for cooling. When the flap 20a of the double door 20 of the refrigerator compartment is opened (the flap 20b is closed), From a spout 30a provided in the first cold air passage 11a, 30b, 30e, 30f will spit out the cold air. The air-conditioning that comes out, The uppermost shelf 34a, 34b and door shelf 33a, After the food in area 2A of 33b is cooled, Reaching the area 2C defined by the lowermost shelf 34e and the heat insulation partition 28, The space is cooled. When there is food in area 2A, The first temperature sensor 43 detects a temperature rise in the area 2A and the second temperature sensor 42 does not detect a temperature rise in the area 2B. A cooling method using a cold air passage 11a is implemented. Because only the newly added food in the area 2A is mainly cooled, Do not over-cool the food in zone 2B, It can also improve energy efficiency.   on the other hand, FIG. 8 shows the flow of the cold air in the refrigerator compartment 2 when the second cold air passage 11b is used for cooling. When the flap 20b of the double door 20 of the refrigerator compartment is opened (the flap 20a is closed), From the discharge port 30c provided in the second cold air passage 11b, 30d will spit out the cold air. The air-conditioning that comes out, Shelves 34c, 34d, After the food in area B of 34e is cooled, Reaching the area 2C defined by the lowermost shelf 34e and the heat insulation partition 28, The space is cooled. When there is food in area 2B, The first temperature sensor 43 does not detect a temperature rise in the area 2A and the second temperature sensor 42 detects a temperature rise in the area 2B. A cooling method using a cold air passage 11b is implemented. Compared with the cooling method using the cold air passage 11a, The area 2B can be efficiently cooled.  And again, As shown in Figure 9, If both the flaps 20a and 20b of the double door 20 of the refrigerator compartment are opened, A cooling method using both the first cold air passage 11a and the second cold air passage 11b can be implemented. If this cooling method is implemented, Even in area 2A, When food is placed in 2B at the same time, Cooling can still be performed efficiently.  In this embodiment, It uses various temperature sensors to detect the temperature of each area in the refrigerator. Control the air volume adjustment device corresponding to its detection result, Thereby, cooling can be performed so that the temperature of each region becomes appropriate. therefore, Do not overcool the already cooled area, Can implement energy-saving cooling, To get frozen food, The effect of quality deterioration.  Additionally, In the refrigerator of this embodiment, In addition to the first temperature sensor 43 described above, Second temperature sensor 42, Other than the third temperature sensor 45, It also has: A fourth temperature sensor (food detection sensor) 48 for detecting the food placed in the lower part of the refrigerator compartment.  As shown in Figure 3, Food detection sensor 48, Its height position, Is between the shelf 34e located immediately above the decompression storage room 35 and the shelf 34c above it, Its left and right position, It is located closer to the refrigerator compartment return opening 39 than the left and right centers. More specifically, the position in the left-right direction is preferably between the discharge port 30d for cooling the lower part of the refrigerator compartment and the cold air return port 39. The discharge port 30d is provided between the lowermost shelf 34e and the upper shelf 34c. The discharge opening 30d is located on the side (right side in this embodiment) from the left and right center of the cover plate 30 The cold air return port 39 is also formed on one side below the lowermost shelf 34e (in the present embodiment, it is more on the right side than the center).  Therefore, It becomes a cold air passage from the discharge port 30d to the cold air return port 39, at least between the lowermost shelf 34e and the upper shelf 34d and on the right side than the center, Can form a rapid cooling zone (corner), The cooling efficiency is improved. and, In this embodiment, By disposing the food detection sensor 48 between the discharge port 30d and the cold air return port 39, It can be detected with high accuracy that hot food is put in the rapid cooling zone, The rapid cooling starts automatically. If an aluminum tray is installed in the rapid cooling zone, It is easy for a user to recognize it as a space for rapid cooling.  Second air-conditioning channel 11b, Because the outlet 34c is also provided immediately below the shelf 34b located near the middle height of the refrigerator compartment 2, The space between the shelf 34c and the shelf 34b (area 2E in FIG. 3) can also be a rapid cooling zone. here, The food detection sensor 48 is located immediately below the shelf 34c, The situation where food is placed even in the space above the shelf 34c can be detected. In addition, Because there is no component that separates left and right in area 2E, Wider space than area 2C, That is, the area immediately above the left shelf 34d, Can also become the object of rapid cooling.   here, For the automatic rapid cooling control using the food detection sensor 48, 15 and 16 will be used for explanation. First of all, It is determined whether the setting of the automatic rapid cooling mode is ON (step S1). When the automatic rapid cooling mode is set to ON, In step S2, When the door 2a, 2b for the opening and closing operation, The process proceeds to a monitoring state for determining whether rapid cooling is permitted. In step S3, After progressing to the monitoring state, When the food detection sensor 48 maintains the state for which the rapid cooling threshold is determined to be above a certain time (rapid cooling start determination time) It is considered that food is put in the lower part of the refrigerating compartment 2, Quick cooling starts. here, The threshold for determining the allowable rapid cooling is set to, Than gate 2a, The detection temperature of the food detection sensor 48 when 2b is turned off is a value higher than a certain temperature.  If rapid cooling starts, Let the compressor 24 rotate at high speed (2000rpm ~ 4000rpm), Let the fan 9 inside the box also rotate at high speed, The baffle 20a for the first air-conditioning passage 11a and the baffle 20b for the second air-conditioning passage 11b are both opened, Supply cold air to both the upper and lower portions of the refrigerator compartment 2, First, the entire refrigerator compartment 2 is cooled. then, When the temperature detected by the food detection sensor 48 becomes below a predetermined threshold (threshold of the baffle 20a), The shutter 20a of the first cold air passage 11a is closed. At this time, Only the cold air is supplied from the second cold air passage 11b, Because the second cold air passage 11b is provided with a discharge port only in the lower part of the refrigerating compartment 2, The area 2D and the area 2E located at the lower part of the refrigerating compartment 2 are collectively cooled.  Then, When the value detected by the food detection sensor 48 becomes lower than a predetermined threshold value (threshold value of the shutter 20b) which is lower than the threshold value of the shutter 20a, The baffle 20b of the second cold air passage 11b is also closed, Stop the rotation of the compressor 24 and the fan 9 in the box, The rapid cooling will end. When the shutter 20a or the shutter 20b is closed, It may be determined based on whether a predetermined time has elapsed from the start of rapid cooling (step S4).  So so, In this embodiment, When the door 2a, 2b After opening and closing, The food detection sensor 48 detects the presence of food in the lower part of the refrigerator, First, the first cold air passage 11a mainly cooling the upper part and the second cold air passage 11b mainly cooling the lower part are supplied with cold air to cool the entire refrigerator compartment. Only the second cold air passage 11b is used to supply cold air, and the lower part of the refrigerating compartment is collectively cooled. Especially in this embodiment, Compared with the spout 30e provided in the first cold air passage 11a, 30f, 30a, 30b total opening area, The outlet 30c provided in the second cold air passage 11b, 30d total opening area is small, Therefore, the wind speed of the cold air supplied to the rapid cooling zone at the lower part of the refrigerating compartment 2 increases, This space can be effectively cooled. 当 在 门 2a 、 When in the door 2a, 2b After opening and closing, Immediately using the second cooling air passage 11b for cooling, Affected by the high temperature of the entire refrigerator compartment, The lower food also becomes difficult to cool, So as mentioned above, First, the cooling using both channels is performed.  As a result, Even if the hot pot is stored in the lower part of the refrigerator, It is still possible to suppress the temperature rise of the food around the hot pot in the lower part of the refrigerating compartment and prevent its deterioration. In addition, It can suppress the excessive cooling of the upper part of the refrigerating compartment far from the hot pot. And reduce power consumption.   here, In the cooling method of FIG. 8 described above, Although it has been explained that the second cooling air passage 11b is used for cooling, But in the cooling method of Figure 8, It is controlled by a second temperature sensor 42 which is purely detecting the temperature inside the box at the lower part of the refrigerating compartment. The rotation speed of the compressor 24 and the fan 9 in the box also rotates at a low speed. In contrast, In the automatic rapid cooling cooling method, It is controlled using a food detection sensor 48 located near the rapid cooling zone in the lower part of the refrigerator compartment. Then, the rotation speed of the compressor 24 and the fan 9 in the box is increased to high-speed rotation. therefore, Can detect the insertion of hot food with high accuracy, And the food can quickly and effectively blow cold air.  Not only the food is placed in the lower part of the refrigerating compartment 2 to be rapidly cooled automatically, With the selection of control panel, etc., When the user makes settings, Regardless of whether or not food is detected, the lower part of the refrigerator compartment 2 may be forced to be rapidly cooled.  Next, the control of the lower cooling is explained, It uses each temperature sensor and each cold air channel, The temperature of the lower part of the refrigerating compartment 2 is kept at 2 ° C or more lower than the temperature of the upper part of the refrigerating compartment 2. Lower cooling mode, Use the control panel to set ON / OFF, When this mode is set to ON, Compared to the case where it is not set, The open state of the shutter 20b becomes longer (the ratio of the time of the opened state of the shutter 20b to the time of the opened state of the shutter 20a increases). in particular, Unlike the OFF setting, The time is set for the shutter 20a to be closed and only the shutter 20b to be opened. but, The rotation speed of the compressor 24 during the lower cooling operation, Instead of spinning at high speeds like during rapid cooling, Instead, maintain low speed rotation (1000rpm ~ 2000rpm).  Next, Regarding control when the lower cooling mode is set to ON, This will be described using FIG. 17. Cooling operation in the lower stage, When a predetermined time elapses after the compressor 24 is stopped, Or if the temperature detected by the second temperature sensor 42 is equal to or higher than a predetermined threshold value (baffle opening threshold value), Let compressor 24 rotate at low speed, And make the baffle 20a, Both sides of 20b become open. then, When the temperature detected by the second temperature sensor 42 becomes lower than a predetermined threshold (threshold of the baffle 20a), The shutter 20a is closed. Furthermore, When the temperature detected by the second temperature sensor 42 becomes lower than a predetermined threshold (threshold of the baffle 20b), The shutter 20b is also closed.  General refrigerators too, The low-temperature air in the refrigerating room is easily concentrated downward. There is also a tendency for the lower part of the refrigerator to become cooler than the upper part. However, according to this embodiment, Can make the upper and lower temperatures more differentiated, Even if it is a food with a different temperature range suitable for storage, an appropriate storage place can be selected. Especially because the lower part of the refrigerator compartment is kept cooler than a normal refrigerator, When food such as a decompression storage room 35 for cryogenic storage is filled with food, Can use the space in the lower part of the refrigerator, Make usability better. When the lower cooling mode is set to OFF, Becomes the control like Figure 18, Damper 20a, 20b always makes both sides open at the same time, Always closed at the same time. In addition, Object space in lower cooling mode, It is wider than the 2D + 2E (Figure 3) of the target space of the automatic rapid cooling mode. It is the entire space between the shelf 34b and the shelf 34e.  In this embodiment, it has: The above-mentioned automatic rapid cooling mode, which automatically performs rapid cooling when it detects that food is put in a predetermined area in the lower part of the refrigerator compartment, The lower cooling mode described above lowers the temperature of the lower part of the refrigerator compartment so that the temperature difference between the lower part of the refrigerator compartment and the upper part of the refrigerator compartment is greater than when the OFF setting is set The ON / OFF setting of these modes is always performed simultaneously with one operation. In other words, it cannot be set to: Only the above automatic rapid cooling mode is ON, and the lower cooling mode is OFF, The automatic rapid cooling mode is OFF and only the lower cooling mode is ON. So so Switch the above 2 modes simultaneously with one operation, And improve user convenience.  Additionally, When the above two modes are set to ON at the same time, Compared to the case where each is set to ON, Its cooling effect is improved. that is, If only the above-mentioned automatic rapid cooling mode is set to ON, Although the food placed in the rapid cooling zone can be quickly cooled, However, other foods that have been placed in the refrigerated compartment space outside the rapid cooling zone are in a relatively high temperature state. therefore, Soon after placing food in the rapid cooling zone, When the temperature of other existing foods rises, May exceed refrigeration temperature. on the other hand, If only the above-mentioned lower cooling mode is set to ON, Not only will it slow down the cooling of food placed in the rapid cooling zone, And may cause other foods already in a lower temperature state to be excessively cooled. So so By setting the automatic rapid cooling mode and the lower cooling mode to ON at the same time, It is possible to perform a cooling operation that rapidly cools the freshly put food and suppresses the influence on the temperature of the existing food.  Additionally, Installed in decompression storage room 35, Refrigerator compartment 2 and ice-making compartment 3, Insulation partitions 28 between the upper freezer compartments 4, Parts such as the water supply pipe 64 for making ice, Because it is close to the ice-making chamber located in the freezing temperature zone3, Upper freezer compartment 4, Easy to become low temperature. then, In order to keep these parts at a temperature that will not freeze, A pressure-reduced storage room temperature guarantee heater 65 is provided in the heat insulation partition wall 28 on the bottom side of the pressure-reduced storage room 35. A water supply pipe temperature guarantee heater 66 (FIG. 4) is provided on the bottom surface side of the water supply pipe 64 in the heat insulation partition wall 28.   especially, If the next cooling mode, Automatic rapid cooling mode is set to ON, The above-mentioned parts become easier to be lowered in temperature. therefore, When their settings are turned ON, As shown in Figure 19, Make the decompression storage room temperature guarantee heater 65, The water supply pipe temperature guarantee heater 66 is energized for a longer time than the OFF setting, And can prevent freezing more reliably. Because the purpose of these temperature guarantee heaters is to prevent the temperature from decreasing, In addition to the method of lengthening the heating time of the heater, Other methods of increasing the output of the heater can also achieve this goal.  Next, The configuration of the refrigerating compartment cold air passage 11 will be described in detail. The first cold air passage 11a and the second cold air passage 11b in this embodiment form, As shown in Figure 10, Is covered by the cover 30, Flow path forming member 41, The seal member 62 and the damper cover 32 are configured.  The cover plate 30 is made of synthetic resin, And has: 30v for the base of the refrigerator door And a vertical portion 30u extending upward from the base portion 30v in the vertical direction. The side of the vertical portion 30u of the cover plate 30 facing the refrigerator compartment, A plurality of front recesses 30w are formed at different height positions corresponding to the discharge ports 30a to 30d. and, The cover plate 30 is arranged at the center in the left-right direction on the back side of the refrigerator compartment 2. In addition, At the upper end portion of the cover plate 30, two left and right outlets 30e, 30f, The outlet 30e from the top side can be made, The cold air of 30f is directed to the uppermost door rack 33a.  FIG. 11 is a perspective view when the cover plate 30 is viewed from the back (rear) side. On the back side of the cover plate 30, A guide convex portion 30t is formed at a portion corresponding to the front concave portion 30w. Cold air inlets 30t0 are formed on the lower surfaces (upstream sides) of the guide protrusions 30t. The cold air flowing into the guide protrusion 30t from the cold air inlet 30t0, It is guided to the front side in the refrigerator compartment 2 through the upper wall surface of the front recessed part 30w.  Next, the flow path forming member 41 will be described. Flow path forming member 41, It is formed by cutting and processing of expanded polystyrene, etc. As shown in Figure 10: The channel portion 41v, which is fitted below the base portion 30v of the cover plate 30, And a body flow path portion 41x fitted in the vertical portion 30x of the cover plate 30. Lower flow path part 41v, Is for the installation of double doors 22 in the refrigerator, And a part of the first cold air passage 11a communicating with the baffle plate 22a of the double door 22 of the refrigerator compartment And a part of the second cold air passage 11b that communicates with the baffle 20b of the double door 22 of the refrigerator compartment.  Additionally, In the main flow path portion 41x of the flow path forming member 41, A plurality of notches 41h are formed at positions of different heights. in particular, A notch 41h1 for the first cooling air passage 11a is formed at the highest position and a position lower than it, A notch 41h2 for the second cooling air passage 11b is formed at the lowest position and a position higher than it. here, The width of the notch 41h1 formed on the upper side is larger than that of the notch 41h2 formed on the lower side. This is because, An outlet 30a is formed above the first cold air passage 11a, The width area of 30b is larger than the discharge openings 30c, The 30d width area is wider.  Between a plurality of adjacent gaps 41h1 located above, As shown in Figure 12, With protruding pieces extending in the up and down direction, That is, the rectifying section 41k. The role of the rectifying section 41k, Is to direct the cold air from the upstream side upward, From the top outlet 30e, 30f allows the air-conditioning effect to flow to the door rack 33a. In addition, The rectifying section 41k further includes: The effect of reinforcing the flow path forming member 41 in the portion sandwiched by the notch 41h1, An effect of preventing the sealing member 62 from being bent.  Additionally, A first groove portion 41ua and a second groove portion 41ub are formed on the back (back) side of the flow path forming member 41. A first cold air passage 11a and a second cold air passage 11b are respectively formed between the seal member 62 and the sealing member 62. First groove portion 41ua, An extension wall 11aa extending in the vertical direction is formed on one end side (right side in FIG. 12) in the left-right direction, An extension wall 11aa extending to a predetermined position higher than the upper end of the second groove portion 41ub is formed on the other end side (left side in FIG. 12) in the left-right direction, On the downstream side, a widened wall 11ab extending linearly or in an arc shape toward the top is formed. With this, The first cold air passage 11a is formed with: It is located at an upstream portion of a height provided in parallel with the second groove portion 41ub, The enlarged section of the flow path gradually enlarged, And a downstream portion having a larger cross-sectional area than the upstream portion. here, The vertical projection of the baffle 20a of the first cooling air passage 11a and the vertical projection of the discharge port 30e are in a positional relationship in which at least a portion overlaps. therefore, The cold air flowing in from the baffle plate 20a located on the side (left side) of the lower end of the cover plate 30, Without being subjected to a large ventilation resistance, it flows toward the discharge port 30e located at the upper end side (left side) of the cover plate 30, Therefore, cold air can be efficiently blown in the refrigerator compartment 2.  And again, On the back side of the downstream portion of the flow path forming member 41, A branching portion 41v is formed in which the cold air in the first cold air passage 11a diverges in the left-right direction, The divided cold air is corresponding to the outlet 30e, 30f toward the groove outlet 41h3 provided at the upper end of the flow path forming member 41, 41h4 flow. With this, For the doors 2a on the left and right, The uppermost door shelf 33a in 2b, It can supply cool air efficiently.  13 is an enlarged perspective view near the height of the shelf 34b of the second stage in a state where the flow path forming member 41 is fitted on the back surface of the cover plate 30. Cold air flowing from the upstream side to the downstream side in a 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 With the inclined portion 41s gradually recessed (deeper) toward the front side as it goes downstream, It is guided toward the cold air inlet 30t0 of the cover plate 30. So so By providing an inclined portion 41s on the wall surface of the flow path forming member 41 located upstream of the cold air inlet 30t0, Can reduce the height of the guide protrusion 30t, In addition, the influence of the ventilation resistance in the passage caused by the guide protrusion 30t can be suppressed. By making the vertical dimension of the inclined portion 41s smaller than the vertical dimension of the notch 41h, It is possible to suppress a reduction in the thickness of the flow path forming member 41 caused by the formation of the inclined portion 41s, It can prevent the insulation performance from decreasing.   here, Although a plurality of cold air inlets 30t0 are formed in the left-right direction on the upstream side of the guide convex portion 30t, However, because a partition wall 30t2 is provided between adjacent cold air inlets 30t0, Not only can it form a substantially wide outlet, In addition, the strength of the cover plate 30 can be ensured and the invasion of dirt can be prevented. Not only spit out 30b, Spit 30a, 30c, 30d also adopts the same structure.  Additionally, In the left and right directions, The flow path forming member 41 is formed in a curved shape whose center portion bulges toward the front side. therefore, The flow path cross-sectional area of the cold air passage formed by the flow path forming member 41 and the sealing member 62 can be enlarged. The cover plate 30 is the same, The horizontal section is curved. therefore, It is easy to diffuse the cold air radially from the cover plate 30 into the refrigerator compartment 2 and spit it out, On the other hand, the inside of the refrigerator compartment 2 can be efficiently cooled.  And again, As shown in Figure 14, The downstream inner wall surface (the upper wall surface of the front concave portion 30w1) 30t1 of the guide convex portion 30t of the cover plate 30 also has a curved surface. therefore, The cold air flowing into the guide convex portion 30t from the inclined portion 41s of the flow path forming member 41 through the cold air inlet 30t0, Can be induced forward while suppressing ventilation resistance, This helps to improve cooling efficiency.  In this embodiment, Each front recess 30w facing the refrigerator compartment side (front side), Appearance is equivalent to the discharge port 30a ~ 30d. however, The area that actually emits cold air is the area where the cold air inlet 30t0 exists. Therefore, when referring to the opening area of each outlet 30a ~ 30d, It refers to the total area of each cold air inlet 30t0.  Sealing member 62, It is a plate-like member made of synthetic resin materials, etc. The first groove portion 41ua and the second groove portion 41ub of the flow path forming member 41 are arranged so as to cover the entirety. In addition, Connected to the inner box 47 using a sealing member 62, This allows the cold air passage to be installed on the back side of the refrigerator compartment.  According to the structure of this embodiment described above, The following effects can be obtained.   First of all, Regarding the first air-conditioning passage 11a which has a large ventilation resistance due to a long flow path, By making the cross-sectional area of the flow path larger than that of the second cold air passage 11b, In general, it can suppress the ventilation resistance until the cold air reaches the downstream. As a result, cool air can be efficiently blown toward the upper space of the refrigerator compartment 2, The energy-saving efficiency is improved.  Second, A guide convex portion 30t is formed inside the wall surface on the front side forming the cold air passage 11, The guide protrusion 30t extends in the horizontal direction and is used to block cold air from the upstream side. A cold air flow inlet 30t0 is formed on the upstream side wall surface (lower surface) of the guide convex portion 30t. Therefore, the cold air in the cold air passage 11 can be efficiently introduced. In addition, The cold air flowing in from the cold air inlet 30t0, Through the inside of the guide protrusion 30t, The upper wall surface passing through the front concave portion 30w is guided to the front side in the refrigerator compartment 2. result, Because the amount of cold air coming out increases, The cooling efficiency is improved.  Additionally, Because the discharge port is formed so as to penetrate the lower surface of the guide convex portion 30t in the vertical direction, Even if the user observes the situation in the refrigerator compartment 2 from the front side, It is still difficult to see the spout and improve the aesthetics. The lower surface of the guide convex portion 30t is not limited to be horizontal, As long as it is closer to the horizontal direction than the vertical direction, Can exert a certain degree of difficulty in seeing the outlet, The effect of increasing the amount of spit air.  And again, 30w horizontally rectangular front recesses at different height positions, The same width is formed regardless of the size of the width area of the outlet. Therefore, there is no abnormality for the user. Can maintain aesthetics. The width dimension of each front recess 30w is not strictly limited to the same, As long as it is in the range of 90% to 110%.  Additionally, In this embodiment, Because the discharge port formed on the front side of the first cold air passage 11a, Is wider than the discharge port formed in front of the second cold air passage 11b, Can supply a wide range of cold air to the upper part of the refrigerating compartment 2 which is generally difficult to cool, The cooling efficiency is improved. and, The first cold air passage 11a extending higher than the second cold air passage 11b, All the outlets 30a and 30a are formed at a position higher than the uppermost outlet 30c of the second cooling air passage 11b. 30b, Therefore, cold air can be supplied centrally toward the upper part of the refrigerator compartment 2, The cooling efficiency is improved.   on the other hand, The upper end of the second cooling air passage 11b is located at a position lower than half the height of the refrigerating compartment 2, All the outlets of the second cold air passage 11b are also located at a position lower than half the height of the refrigerator compartment 2. therefore, As long as the shutter 20a of the double door 20 of the refrigerator compartment is closed and the shutter 20b is opened, It is possible to centrally supply cold air to the lower part of the refrigerator compartment 2, So you can: Rapid cooling when hot food is placed in the lower part of the refrigerator compartment 2, The lower part of the refrigerator compartment 2 is kept at a lower temperature than the upper part and cooled. here, The space below half of the height of the refrigerator compartment 2, It is equivalent to a position slightly higher than the insulation partition wall 28 close to the waistline of the average user, Its frequency of use is high, So use this space as a rapid cooling, The objects cooled down are effective. In particular, if the lower part of the refrigerator compartment 2 is kept below 2 ° C, It can greatly improve the long-term preservation of pre-prepared foods. In addition, Even if hot food is placed in a part of the refrigerating compartment 2, Because the space was rapidly cooled, Can suppress temperature rise in other spaces, As a result, the storage stability of the entire refrigerator compartment 2 is also improved.

1‧‧‧ refrigerator

2‧‧‧ freezer

2a, 2b‧‧‧‧Refrigerator door

3‧‧‧ ice making room

3a‧‧‧ Ice door

3b‧‧‧Storage Container

4‧‧‧ Upper Freezer

4a‧‧‧Upper freezer door

4b‧‧‧Storage Container

5‧‧‧ Lower freezer

5a‧‧‧ Lower freezer door

5b‧‧‧Storage Container

6‧‧‧ Fruit and Vegetable Room

6a‧‧‧ Fruit and vegetable room door

6b‧‧‧Storage Container

7‧‧‧ cooler

8‧‧‧ cooler storage room

9‧‧‧fan inside the box

10‧‧‧Insulated Box

11‧‧‧ Refrigerator air-conditioning channel

11a‧‧‧The first air-conditioning channel

11aa‧‧‧Extended wall of the first air-conditioning channel

11ab‧‧‧The widened wall of the first air-conditioning channel

11b‧‧‧Second air-conditioning channel

12‧‧‧ Upper section freezer cold air passage

13‧‧‧ Lower section freezer air-conditioning channel

17‧‧‧ Freezer return

18‧‧‧ Return path of fruit and vegetable room

18a‧‧‧Vegetable Fruit Room Return

18b‧‧‧Vegetable and Fruit Room

20‧‧‧Double air door in refrigerator

20a‧‧‧ Bezel

20b‧‧‧ Bezel

21‧‧‧Evaporation plate

22‧‧‧ Defrost heater

23‧‧‧ aqueduct

24‧‧‧compressor

25‧‧‧Vacuum insulation material

27‧‧‧drain hole

28, 29, 40‧‧‧ insulated wall

30‧‧‧ Cover

30a, 30b, 30c, 30d, 30e, 30f

30t‧‧‧Guide convex

30w‧‧‧Front recess

33a, 33b, 33c‧‧‧door rack

34a, 34b, 34c, 34d, 34e‧‧‧shelf

35‧‧‧Decompression storage room

36‧‧‧ Ice Water Tank

39‧‧‧ Refrigerator return

41‧‧‧Flow path forming member

41h‧‧‧ gap

41h‧‧‧Rectification Department

41s‧‧‧inclined

41v‧‧‧Division

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 board

52‧‧‧Out-of-box temperature sensor

53‧‧‧door hinge cover

55‧‧‧handle

56‧‧‧ Decompression storage room door

60‧‧‧Freezer door

61‧‧‧machine room

62‧‧‧sealing member

63‧‧‧Top

64‧‧‧ water supply pipe

65‧‧‧Pressure storage room temperature guarantee heater

66‧‧‧ Water Supply Pipe Temperature Guarantee Heater

FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along A-A in FIG. 1. Figure 3 is a front view of the refrigerator compartment. FIG. 4 is a sectional view taken along the line B-B in FIG. 3. FIG. 5 is a front view of a cold air passage of the refrigerator compartment of this embodiment. FIG. 6 is a sectional view taken along the line C-C in FIG. 5. FIG. 7 shows the flow of cold air when it is cooled by the first cold air passage 11a. FIG. 8 shows the flow of cold air in the case of cooling by the second cold air passage 11b. FIG. 9 shows the flow of cold air in the case where both the first cold air passage 11a and the second cold air passage 11b are cooled. FIG. 10 is an exploded perspective view showing a cold air passage of a refrigerator compartment. FIG. 11 is a perspective view of the cover plate 30 as viewed from the back side. FIG. 12 is a perspective view as viewed from the back side of the flow path forming member 41. FIG. 13 is an enlarged perspective view showing the vicinity of the discharge port 30 b in a state where the cover plate 30 is fitted with the flow path forming member 41. FIG. 14 is an enlarged perspective view of the vicinity of the front concave portion 30w1 of the cover plate 30 as viewed from the front side. Figure 15 is a flowchart showing the control of automatic rapid cooling. Figure 16 is a timing chart of automatic rapid cooling. Figure 17 is a timing chart when the lower cooling is set to ON. Figure 18 is a timing chart when the lower cooling is set to OFF. Figure 19 timing chart of temperature guarantee heater.

Claims (10)

A refrigerator includes a storage room in a refrigerated temperature zone, a cold air passage provided on the back side of the storage room, and a blowing means for sending cold air toward the cold air passage; the cold air passage includes: The first cooling air passage cooled by the upper part and the second cooling air passage mainly cooling the lower part of the storage compartment are characterized in that they are provided with a lower cooling mode in which the lower part of the refrigerating compartment is lowered to make it cooler. The temperature difference from the upper part of the refrigerating compartment is greater than when the setting is OFF. When the lower cooling mode is set to ON, the cold air supply time of the second cold air passage is set to The proportion of the cooling air supply time of a cooling air passage is increased. A refrigerator includes a storage room in a refrigerated temperature zone, a cold air passage provided on the back side of the storage room, and a blowing means for sending cold air toward the cold air passage; the cold air passage includes: A first air-conditioning channel cooled on the upper part and a second air-conditioning channel mainly cooled on the lower part of the storage room; characterized in that after the door of the storage room is opened and closed, if the food detection sensor detects Food is placed in the lower part of the chamber, and after supplying cold air using both the first cold air passage and the second cold air passage, only the second cold air passage is used to supply cold air. The refrigerator according to claim 2, wherein the food detection sensor is disposed between the outlet of the second cold air passage and the return of the cold air. The refrigerator according to claim 2, wherein, if the food detection sensor detects that food is placed in the lower part of the storage compartment, compared with the case where the food detection sensor is not detected, the compressor is rotated. Speed up. The refrigerator according to claim 2, wherein the total opening area of the outlet of the second cooling air passage is smaller than the total opening area of the outlet of the first cooling air passage. A refrigerator is characterized in that it has an automatic rapid cooling mode and a lower cooling mode. In this automatic rapid cooling mode, if a food detection sensor detects that food is placed in a predetermined area below the refrigerating compartment, the automatic Perform rapid cooling; in this lower cooling mode, the lower part of the refrigerating compartment is lowered so that the temperature difference between the lower part of the refrigerating compartment and the upper part of the refrigerating compartment is larger than OFF. When the automatic rapid cooling mode and the lower cooling mode are set to ON, In the case, if the food detection sensor detects that food is placed in a predetermined area at the lower part of the refrigerating compartment, it will automatically perform rapid cooling, and lower the temperature of the lower part of the refrigerating compartment to make the temperature difference from the upper part of the refrigerating compartment. It is larger than when set to OFF. A refrigerator is characterized in that it has an automatic rapid cooling mode and a lower cooling mode. In this automatic rapid cooling mode, if a food detection sensor detects that food is placed in a predetermined area below the refrigerating compartment, the automatic Perform rapid cooling; in this lower cooling mode, lower the temperature of the lower part of the refrigerating compartment to make the temperature difference between the lower part of the refrigerating compartment and the upper part of the refrigerating compartment larger than when the OFF setting is set, and set the automatic rapid cooling mode and the lower cooling mode to ON / OFF is to switch at the same time by one operation. The refrigerator according to claim 6 or 7, wherein the refrigerator is provided with a cold air passage provided on a back side of the refrigerating compartment and a means for supplying cold air to the cold air passage, and the cold air passage includes: The first cold air passage mainly cooling the upper part of the refrigerator compartment, and the second cold air passage mainly cooling the lower part of the refrigerator compartment. The refrigerator according to claim 8, wherein after the door of the storage compartment is opened and closed, if the food detection sensor detects that food has been placed in a predetermined area below the refrigerator compartment, the first After both the one cold air passage and the second cold air passage supply cold air, only the second cold air passage is used to supply cold air. The refrigerator according to claim 8, wherein when the setting is ON, the ratio of the cooling air supply time of the second cooling air passage to the cooling air supply time of the first cooling air passage is increased compared to the OFF setting. .