JP6360717B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator that cools and stores food and the like in a storage chamber, and more particularly, to a refrigerator that can suppress a temperature rise in a freezing chamber.

  In this type of refrigerator, when defrosting the cooler, there is a problem that warm air around the cooler heated by the defrost heater flows into the storage chamber and the temperature in the storage chamber rises. Therefore, as a method of preventing warm air during the defrosting operation from entering the storage chamber, a damper is provided in the cooling air passage and the damper is closed during the defrosting operation, or a shutter is provided in the fan and the shutter is closed. A method is known (for example, Patent Document 1).

  FIG. 9A is a front view showing the air path configuration of the refrigerator 100 disclosed in Patent Document 1. FIG. In the refrigerator 100 according to the related art, the inlet air dampers 105, 106, 107, and 108 are provided in the cool air supply air passages 101, 102, 103, and 104 that send the air cooled by the cooler to the storage chamber, respectively. Further, outlet dampers 113, 114, and 115 are provided in the cool air return air passages 109, 110, and 111 for returning air from the storage chamber to the cooler unit, respectively. In addition, an outlet damper 116 is provided in the cool air return air passage (not shown in the drawing) from the freezer compartment 112. During the defrosting operation, all or part of the inlet dampers 105 to 108 and the outlet dampers 113 to 116 are closed.

  FIG. 9B is a diagram illustrating the periphery of the fan 117 of the refrigerator 100. In the refrigerator 100, a shutter 118 is installed on the fan 117, and the shutter 118 is closed during defrosting to prevent warm air from flowing into the cold air supply air passages 101 to 104.

  Moreover, the technique which suppresses the temperature rise of the refrigerator compartment after defrosting is described in the following patent document 2. Referring to FIG. 4 and the explanation thereof in this document, a part of the supply air passage 16 is partitioned by the partition body 40, and a space portion 14 connected to the cooling chamber 13 through the feed opening 13a is formed. A first opening 19 is provided in the partition region between the space 14 and the supply air passage 16, and a second opening 20 is provided in the partition region between the space 14 and the return air passage 29 or the cooling chamber 13. Yes. Thereby, the air of the space part 14 and the cooling chamber 13 is circulated by making the space part 14 into the circulation air path by setting the first opening part 19 to the closed state and blowing the second opening part 20 to the open state. Can be cooled.

JP 2009-250476 A JP 2013-200074 A

  However, in the refrigerator of the prior art provided with the damper and the shutter described in Patent Document 1, it is possible to prevent the defrost warm air from flowing into the storage room during the defrosting operation, but after the defrosting operation is finished, the cooling operation is started. Immediately after that, there was a problem that the temperature in the storage chamber would rise. That is, in such a conventional refrigerator, when the defrosting operation is finished and the cooling operation is started, the air in the cooling chamber or the air passage heated by defrosting flows into the storage chamber, and the temperature in the storage chamber rises. End up.

  Moreover, even with the technique according to Patent Document 2, the temperature of the food that is to be frozen may increase after the defrosting process is completed. As a result, the temperature of the frozen food becomes higher than the ambient temperature of the freezer, and freeze-burning occurs in which the food is dried by moisture sublimation. Moreover, when the temperature change of the food stored in the freezer compartment becomes large, ice crystals inside the food become large, and if the food cells are destroyed, a lot of drip is generated.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator capable of preventing freeze-burning or the like by suppressing temperature rise in the freezer compartment.

The refrigerator of the present invention includes a refrigerating room, a freezing room, a cooling room in which the refrigerating room and a cooler that cools the air supplied to the freezing room are housed, and a defrosting unit that defrosts the cooling room. that pulls in provides cooling air cooled by the cooler into the refrigerating chamber or the freezing chamber, a blower capable of changing the wind in three stages, interposed air path connecting the said refrigerating chamber and the blower A first air path switch and a second air path switch interposed in an air path connecting the blower and the freezing chamber, and the defrosting means performs the defrosting when the first defrosting means performs the defrosting. The air path switch and the second air path switch are in a closed state, and after the defrosting is finished, the first air path switch is closed and the second air path switch is opened for a predetermined time. By operating the blower, the cold air is supplied to the freezer, and the predetermined time has elapsed. After the, the said blower operate the first air passage switch and the second air passage switch the open state, it supplies the cold air to the refrigerating chamber and the freezing chamber, furthermore, after the defrosting has ended Then, before supplying the cold air to the refrigerator compartment or the freezer compartment, the first air path switch and the second air path switch are closed, and the cool air is circulated by the blower, The air blowing capacity of the blower when the cooling chamber is pre-cooled and the cold air is circulated is lower than when the cold air is supplied to the refrigerating chamber or the freezing chamber .

  According to the present invention, after the defrosting is completed, the first air passage switch on the refrigerator compartment side is closed, and the blower is operated with the second air passage switch on the freezer compartment opened. The temperature rise of the object to be frozen stored in the room is suppressed. Thereby, the above-mentioned freezing burn is prevented. Moreover, since the temperature change is reduced by suppressing the temperature rise of the object to be frozen, the occurrence of freezing and drip is also suppressed.

It is a front external view of the refrigerator which concerns on embodiment of this invention. It is side surface sectional drawing which shows schematic structure of the refrigerator which concerns on embodiment of this invention. It is a front view for demonstrating the cooling air path of the refrigerator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the cooling chamber periphery of the refrigerator which concerns on embodiment of this invention. It is a control time chart which shows the operation control of the refrigerator which concerns on embodiment of this invention. It is a figure which shows the modification of the refrigerator which concerns on other embodiment of this invention, (A) is side sectional drawing which shows the periphery of the air path switch arrange | positioned at the upper part, (B) is arrange | positioned at the lower part It is side surface sectional drawing which shows the circumference | surroundings of a wind path switch. It is side surface sectional drawing which shows the structure of the cooling chamber periphery of the refrigerator which concerns on other embodiment of this invention. It is a control time chart which shows the operation control of the refrigerator which concerns on other embodiment of this invention. It is a figure which shows the example of the refrigerator of a prior art, (A) is a front view, (B) is a front view which shows a fan periphery.

  Hereinafter, the refrigerator which concerns on the 1st Embodiment of this invention is demonstrated in detail based on drawing.

  As shown in FIG. 1, the refrigerator 1 according to the present embodiment includes a heat insulating box 2 as a main body, and forms a storage room for storing food and the like inside the heat insulating box 2. The interior of the storage room is divided into a plurality of storage rooms according to storage temperature and usage. As for the arrangement of the storage chambers, the uppermost stage is the refrigeration room 3, the lower left side is the ice making room 4, the right side is the upper freezing room 5, the lower stage is the lower freezing room 6, and the lowermost stage is the vegetable room 7.

  The front surface of the heat insulating box 2 is opened, and doors 8a, 8b, 9, 10, 11, and 12 are provided in the opening corresponding to the refrigerator compartment 3 and the like so as to be freely opened and closed. The doors 8a and 8b divide and cover the front surface of the refrigerator compartment 3, and the left upper and lower parts of the door 8a and the upper right lower part of the door 8b are rotatably supported by the heat insulating box 2. Moreover, the door 9, the door 10, the door 11, and the door 12 are each united with the storage container mentioned later, and are supported by the heat insulation box 2 so that it can be pulled out ahead of the refrigerator 1.

  The basic function of the refrigerator 1 is to cool an object to be stored such as food stored in each storage room to a predetermined temperature. As an example, the internal temperature of the refrigerator compartment 3 is in the range of 3 ° C. to 6 ° C., and the internal temperature of the freezer compartment (the lower freezer compartment 6 etc.) is in the range of −16 ° C. to −22 ° C. The inside temperature is in the range of 3 ° C to 8 ° C.

  As shown in FIG. 2, the heat insulation box 2 which is the main body of the refrigerator 1 is disposed with a steel plate outer box 2a having an opening on the front surface and a gap in the outer box 2a, and opens on the front surface. And an insulating box 2c made of polyurethane foam and filled in a gap between the outer box 2a and the inner box 2c. In addition, the back wall portion of the heat insulating box 2 is provided with a vacuum heat insulating material 2d.

  As described above, the storage room is divided into a plurality of storage rooms, and the cold storage room 3 and the ice making room 4 and the upper freezing room 5 positioned below the storage room 3 are partitioned by the heat insulating partition wall 34. Further, the ice making chamber 4 and the upper freezing chamber 5 are partitioned by a partition wall (not shown in the drawing) in which a vent hole through which cool air can flow is formed. Furthermore, the ice making chamber 4 and the upper freezing chamber 5 and the lower freezing chamber 6 provided below the ice making chamber 4 are partitioned by a partition wall 35 having a vent hole through which cool air can flow. The lower freezer compartment 6 and the vegetable compartment 7 are partitioned by a heat insulating partition wall 36.

  Furthermore, a shelf 42 and a storage container 43 for storing food and the like are disposed inside the refrigerator compartment 3. Storage pockets 44 and 45 for storing beverage containers and the like are provided inside the doors 8a and 8b. In each of the other storage chambers (ice making chamber 4 and the like), storage containers 46, 47a, 47b, and 48 that can be pulled out integrally with the doors 9, 10, 11, and 12 are provided. The storage container disposed in the ice making chamber 4 does not appear in the drawing. Each storage room in the storage room also includes other storage shelves and storage containers that do not appear in the drawings. For example, the refrigerator compartment 3 is also provided with a container for storing ice-making water.

  Further, a machine room 49 is provided on the lower back side of the refrigerator 1. Components such as a compressor 31 for compressing refrigerant, a radiator (not shown), and a heat radiating fan (not shown) are arranged in the machine chamber 49. The compressor 31, a radiator, a capillary tube (not shown) as decompression means, and a cooler 32 are sequentially connected by a refrigerant pipe to form a vapor compression refrigeration circuit. In the refrigerator 1 according to the present embodiment, isobutane (R600a) is used as the refrigerant.

  A supply air passage 15 that guides the air cooled by the cooler 32 to the inside of the refrigerator compartment 3 is formed on the back surface and the top surface of the refrigerator compartment 3. The supply air passage 15 is a space sandwiched between the air passage partition wall 38 made of synthetic resin and the inner box 2 c of the heat insulating box 2. Further, the air passage partition wall 38 is formed with an air outlet 21 for supplying the cold air flowing through the supply air passage 15 to the inside of the refrigerator compartment 3.

  Similarly, a supply air passage 16 as a supply air passage for refrigeration is formed on the back and top surfaces of the ice making chamber 4 and the upper freezer compartment 5 and the rear surface of the lower freezer compartment 6. The supply air passage 16 is partitioned from each storage chamber (ice making chamber or the like) by an air passage partition wall 39 made of synthetic resin. The air channel partition wall 39 is formed with an air outlet 22 for flowing cold air to the ice making chamber 4, an air outlet 23 for flowing cold air to the upper freezer chamber 5, and an air outlet 24 for flowing cold air to the lower freezer chamber 6. Has been. In addition, each outlet 22-24 is arrange | positioned in the position which can supply cold air efficiently with respect to the food etc. which were accommodated in the storage containers 46, 47a, 47b.

  In addition, a space 14 that is partitioned from the supply air passage 16 is formed on the back surface, that is, the back side of the supply air passage 16. The supply air passage 16 and the space 14 are partitioned by a synthetic resin partition 40.

  Moreover, the supply air path 15 and the space part 14 are connected via the air path switch 18 (1st air path switch). The air path switch 18 is a motor damper including a plate-like body serving as an opening / closing lid that is pivotally supported on one side and a drive motor. Note that the air path switch 18 is not limited to this, and other types of switch devices such as a slide-type switch board may be employed. By opening and closing the air path switch 18, it is possible to adjust whether or not air flows from the space portion 14 to the supply air path 15. Moreover, the flow rate of the cold air supplied to the refrigerator compartment 3 can be adjusted by performing an appropriate opening / closing operation of the air path switch 18.

  The lower freezer compartment 6 is provided with a return port 27 for returning air to the cooling chamber 13, and the vegetable compartment 7 is provided with a return port 28 for the same purpose.

  As shown in FIG. 3, the supply air passage 15 for supplying cold air to the refrigerator compartment 3 is configured to send the cold air to the uppermost portion in the central portion of the refrigerator compartment 3 and then descend from both sides. . Thereby, cold air can be efficiently supplied to the whole inside of the refrigerator compartment 3.

  Moreover, the supply air path 15 is provided with the branch air path branched from the center part to right and left corresponding to the blower outlet 21 formed near upper part of the storage container 43 (refer FIG. 2). Thereby, the inside of the storage container 43 can be efficiently cooled.

  In addition, the refrigerator 1 according to the present embodiment includes a connection air passage 17 for flowing cold air from the inside of the refrigerator compartment 3 to the vegetable compartment 7. A return port 26 through which cold air from the refrigerator room 3 flows is formed on the side of the refrigerator compartment 3 of the connection air passage 17, and an outlet 25 for supplying cold air to the vegetable compartment 7 is provided on the vegetable compartment 7 side. It has been.

  As shown in FIG. 4, the cooling chamber 13 is provided inside the heat insulating box 2 and on the back side of the space portion 14. The cooling chamber 13 and the space 14 are partitioned by a synthetic resin partition wall 37.

  Inside the cooling chamber 13, a cooler 32 for cooling the circulating air is disposed. The cooler 32 according to the present embodiment is a so-called fin-and-tube heat exchanger in which the inside of a circular tube as a heat transfer tube is a refrigerant flow path and the outside of the tube is an air flow path. In the cooler 32, the liquid refrigerant evaporates inside the heat transfer tube, thereby cooling the air outside the tube. As the cooler 32, it is of course possible to employ other types of heat exchangers such as a heat exchanger using a flat porous tube or a deformed tube.

  A defrost heater 33 is provided below the cooler 32 as defrosting means for melting and removing frost adhering to the cooler 32. The defrost heater 33 is an electric resistance heating type heater protected by a glass tube. In addition, as a defrosting means, it is also possible to employ | adopt other defrost systems, such as hot gas defrost which does not use an electric heater, for example.

  Further, a feed opening 13 a for sending out the cool air cooled by the cooler 32 is formed on the upper front surface of the cooling chamber 13, that is, the surface on the space 14 side. On the other hand, below the cooling chamber 13, a return opening 13 b is formed for sucking the return cold air from the storage chamber into the cooling chamber 13. The return opening 13b is connected to the return port 27 of the lower freezing chamber 6 and the return port 28 of the vegetable room via a return air passage 29 (29a, 29b).

  A blower 30 for circulating cold air is attached to the feed opening 13a. The blower 30 is an axial-flow blower having a rotary propeller fan, a fan motor (not shown), and a casing (not shown) in which a wind tunnel is formed. In addition, as a blower 30, you may employ | adopt other types of blowers, such as a combination of the propeller fan and motor of a type which is not provided with a casing, a sirocco fan, etc., for example.

  Here, as described above, the partition body 40 divides a part of the supply air passage 16 and forms the space portion 14 that communicates with the cooling chamber 13 via the feed opening portion 13a. Specifically, a synthetic resin partition 40 formed in a predetermined shape so that the surface facing the cooling chamber 13 is concave on the front surface of the partition wall 37 has a peripheral edge abutting against the partition wall 37. Assembled. Further, an air passage partition wall 39 made of a synthetic resin formed in a predetermined shape is assembled on the front surface of the partition body 40 so that the peripheral edge abuts on the partition wall 37.

  As a result, the supply air passage 16 is formed in the back of the ice making chamber 4 or the like so as to be sandwiched between the air passage partition wall 39 and the partition body 40, and is further sandwiched between the partition body 40 and the partition wall 37 in the back thereof. Thus, the space portion 14 is formed. Thus, in the refrigerator 1 according to the present embodiment, since the supply air passage 16 and the space portion 14 are partitioned between the ice making chamber 4 and the cooling chamber 13, the cooling chamber 13 is moved to the ice making chamber 4 and the like. Heat transfer can be reduced.

  In addition, a partition 40 serving as a partition region between the supply air passage 16 and the space portion 14 is provided with a freely openable / closable airway switch 19 (second airway switch). In addition, an air path switch 20 (third air path switch) that can be freely opened and closed is provided in a partition region between the space portion 14 and the return air path 29. In the present embodiment, so-called motor dampers are employed as the air path switch 19 and the air path switch 20 in the same manner as the air path switch 18 described above.

  Thus, since the refrigerator 1 which concerns on this embodiment is provided with the space part 14, the air path switch 19, and the air path switch 20, the air path switch 19 and the air path switch 20 are provided. By setting both to the closed state, it is possible to prevent warm air in the cooling chamber 13 from flowing into the ice making chamber 4 or the like.

  Moreover, since the refrigerator 1 which concerns on this embodiment is provided with the air path switch 18 in the supply air path 15 connected to the space part 14, by supplying the air path switch 18 to a closed state, the supply air path 15 and the warm air in the cooling chamber 13 can be prevented from flowing into the refrigerating chamber 3.

  It is also possible to supply cold air only to the freezer compartment by opening only the air path switch 19 and closing the air path switch 18 and the air path switch 20.

  Further, the air path switch 19 and the air path switch 18 are both closed, and the air path switch 20 is opened, so that the air flowing out from the feed opening 13a is supplied to the space 14 and the air path switch. 20, an air path that sequentially flows through the return air passage 29 and the return opening 13b and returns to the cooling chamber 13 can be formed.

  Next, operation | movement of the refrigerator 1 which concerns on this embodiment is demonstrated. First, the cooling operation for cooling the storage chamber will be described. In the cooling operation, the air path switch 19 is opened, the air path switch 20 is closed, and the air path switch 18 is appropriately opened and closed according to the cooling load of the refrigerator compartment.

  First, the air flowing through the cooling chamber 13 is cooled by the above-described vapor compression refrigeration circuit. That is, the low-temperature and low-pressure refrigerant vapor is compressed into a high-temperature and high-pressure state by the compressor 31 shown in FIG. 2 and radiated by a radiator (not shown). Then, the liquid refrigerant that has been deprived of heat and condensed in the radiator is squeezed and expanded by a capillary tube (not shown) as decompression means, and flows to the cooler 32. In the cooler 32, the low-temperature and low-pressure liquid refrigerant exchanges heat with air and evaporates. As a result, the air in the cooling chamber 13 is cooled by the latent heat of vaporization of the refrigerant. The vapor refrigerant evaporated in the cooler 32 is again sucked into the compressor 31 and compressed. The operation described above is continuously repeated, and air is cooled by the cooler 32 of the refrigeration circuit.

  As shown in FIGS. 2 to 4, the air cooled by the cooler 32 is discharged from the feed opening 13 a of the cooling chamber 13 to the space 14 by the blower 30.

  A part of the cooling air (cold air) discharged into the space 14 is adjusted to an appropriate flow rate by the air passage switch 18, flows to the supply air passage 15, and is supplied from the air outlet 21 to the refrigerator compartment 3. Is done. Thereby, the food etc. which were stored in the inside of the refrigerator compartment 3 can be cooled and preserve | saved at appropriate temperature.

  The cold air supplied to the inside of the refrigerator compartment 3 flows from the return port 26 to the connection air passage 17 and is supplied from the outlet 25 to the vegetable compartment 7. And the cold air which circulated through the vegetable compartment 7 returns to the inside of the cooling chamber 13 from the return port 28 through the return air passage 29 b and the return opening 13 b of the cooling chamber 13. Therefore, it is cooled again by the cooler 32.

  On the other hand, a part of the cooling air discharged into the space portion 14 passes through the air passage switch 19 and flows to the supply air passage 16, and to the ice making chamber 4 and the upper freezer compartment 5 through the air outlets 22 and 23. And each supplied. Then, the cold air flows to the lower freezer compartment 6 through an opening formed in the partition wall 35.

  Further, a part of the cooling air that has flowed to the supply air passage 16 via the air passage switch 19 is supplied to the lower freezer compartment 6 from the outlet 24. Then, the air inside the lower freezer compartment 6 flows from the return port 27 through the return air passage 29 a to the inside of the cooling chamber 13 through the return opening 13 b of the cooling chamber 13. As described above, the air cooled by the cooler 32 circulates in the storage chamber, and cold storage of food and the like is performed.

  Next, based on the control time chart of FIG. 5, the operation during the defrosting operation and the subsequent operation will be described with reference to FIGS. 2 and 4 as appropriate. The upper part of FIG. 5 is a time chart showing the control operation of the refrigerator of this embodiment, and the lower part is a graph showing the temperature change inside the freezer compartment. In this graph, the horizontal axis represents elapsed time, and the vertical axis represents temperature. In this graph, the dotted line indicates the air temperature at a position 1/3 height from the lower end of the lower freezer compartment 6.

  If the cooling operation is continued, frost adheres to the air-side heat transfer surface of the cooler 32, hinders heat transfer and closes the air flow path. Therefore, a control device (not shown) determines frost formation from a decrease in the refrigerant evaporation temperature or the like, or determines it using a defrost timer or the like, and starts a defrosting operation for removing frost adhering to the cooler 32.

  Time T0 in FIG. 5 indicates the time when the defrosting operation is started. When performing the defrosting operation, the control device (not shown) stops the operation of the compressor 31, stops the blower 30, closes both the air path switch 19 and the air path switch 20, and the air path switch 18. Thus, the supply air passage 15 is closed. Then, the defrost heater 33 is energized.

  Then, the frost attached to the cooler 32 and the cooling chamber 13 is melted by the heat generated by the defrost heater 33. The water after melting the frost flows down to an evaporating dish (not shown) provided in the machine room 49 via a drain pipe (not shown) provided below the cooling chamber 13. And the water evaporates with the heat from the compressor 31 grade | etc., In an evaporating dish.

  The heat generated by the defrost heater 33 warms the air in the cooling chamber 13. However, in the present embodiment, as described above, a part of the supply air passage 16 is partitioned by the partition body 40, the air passage switch 19 and the air passage switch 20 are closed, and the air supply by the air passage switch 18 is supplied. Since the passage 15 is closed, it is possible to prevent warm air from flowing out to the supply air passages 15 and 16. Therefore, it is possible to prevent the inside of the supply air passages 15 and 16 from being warmed by the defrost warm air.

  Time T1 indicates when the defrosting operation is stopped. The control device detects that the temperature detected by a temperature sensor (not shown) attached to the pipe of the cooler 32 becomes a predetermined value, and determines completion of the defrosting operation. In addition, it is good also as performing defrosting for predetermined time with a timer etc.

  When the defrosting of the cooler 32 is completed (time T1), the control device (not shown) stops energization of the defrosting heater 33 and waits for a predetermined time (until time T2) without performing the next operation. Thus, by providing the standby time, it is possible to reduce the frost residue and cool the air inside the cooler.

  Next, at time T <b> 2, the control device starts the compressor 31. At this time, the blower 30 remains stopped. Thereby, the air around the cooler 32 that has been heated by the defrost heater 33 and whose temperature has risen can be efficiently cooled without taking it out of the cooling chamber 13 (first precooling step).

  Next, at time T <b> 3, the control device opens the air path switch 20 and starts blowing by the blower 30. Thus, the air in the cooling chamber 13 is circulated using the space portion 14 as a circulation air path, cooled by the cooler 32, and the temperature of the air in the space portion 14 and the cooling chamber 13 can be adjusted (second precooling). Process). In this process, the air path switch 18 and the air path switch 19 are closed.

  Here, in the second precooling step, the heat exchange between the air-side heat transfer surface of the cooler 32 and the air is forced convection heat transfer. Therefore, highly efficient heat exchange becomes possible, and the air in the space 14 and the cooling chamber 13 can be efficiently cooled in a short time.

  Referring to the graph shown in the lower part of FIG. 5, the temperature of the air in the lower freezer compartment 6 continues to rise until time T4. This is because cold air is not supplied to the freezing chamber from the beginning of the defrosting process (time T0) to the end of precooling 2 (time T4).

  Time T4 indicates the end of the second precooling stroke. Here, the control device detects that the temperature detected by a temperature sensor (not shown) provided in the cooling chamber 13 becomes a predetermined value (target cooling temperature), and completes the air temperature adjustment. That is, the end of the second pre-cooling process is determined. Note that the second pre-cooling process may be performed for a predetermined time by a timer or the like.

  Here, the voltage supplied to the blower 30 of this embodiment can be adjusted to high (100%), medium (90%), and low (60%). When the voltage is low, the rotation of the blower 30 is slowed down and wind power is increased. Also become weaker. A low voltage is adopted in the second precooling step.

  The reason why the blower 30 is operated at such a low voltage is as follows. If the voltage of the blower 30 is operated in a high or medium state, the air temperature at the representative point of the lower freezer compartment 6 rapidly rises by about 2 ° C. The reason for this is as follows. In the defrosting process, a part of the warm air heated by the defrosting heater 33 rises along the inside of the partition 39 through the opening 13b and the return port 27 located below the cooler 32, and the blowout port The air temperature around 24 becomes high. That is, the air flow at the opening 13b in the defrosting process is opposite to the other process (the process of supplying cold air to the freezer compartment), and a part of the warm air enters the lower freezer compartment 6 and the like. Therefore, when the air blower 30 is operated at a high voltage and the air volume is large, a large amount of warm air existing in the vicinity of the air outlet 24 enters the storage containers 47a and 47b, and the temperature rise at the representative point increases.

  On the other hand, when the voltage of the blower 30 is set to a low voltage, the temperature rise at the representative point described above is reduced to about 1 ° C. This is because the air volume generated by the blower 30 is reduced, so the amount of warm air entering the storage containers 47a and 47b is reduced, the inflow of warm air to the representative points is weakened, and the temperature rise is suppressed. It is.

  After the second pre-cooling step is completed (time T4), the control device opens the air passage switch 19 and closes the air passage switch 20 and the air passage switch 18 so that the voltage is applied to the blower 30. Operate in the state.

  Thereby, the cold air cooled by the cooler 32 is blown by the blower 30 and passes through the space portion 14, the air path switch 19, and the outlets 22, 23, 24, and the ice making chamber 4, the upper freezing chamber 5, and It is supplied to the lower freezer compartment 6. By setting the voltage of the blower 30 to the middle in this process, the power required for blowing can be saved.

  In this process, by cooling only the freezer compartment, it is possible to prevent the object to be frozen such as food stored in the freezer compartment from being frozen and burned.

  Specifically, suppose that after the pre-cooling 2 is completed, the lower freezer compartment 6 and the like and the refrigerator compartment 3 are cooled at the same time. As a result, the food that is to be frozen cannot be sufficiently cooled, so the temperature of the food becomes higher than the ambient temperature of the lower freezer compartment 6, and moisture sublimates from the surface of the food to dry the surface. There is a risk of freeze-burning. Moreover, since the temperature change of food becomes large, there is a risk that the amount of drip is increased due to enlarging fine crystals of food.

  Therefore, in this embodiment, after the pre-cooling 2 is completed, the temperature rise of the food stored in the lower freezer compartment 6 is suppressed by supplying cold air only to the lower freezer compartment 6 and the like for several minutes. As a result, the temperature of the lower freezer compartment was about −14 ° C. at the time T4 when the pre-cooling 2 was finished, but decreased to about −16 ° C. at the time T5 when the main process was finished. Thus, by lowering the room temperature of the lower freezer compartment 6, the extent to which the food temperature rises is reduced. Therefore, the temperature of the food that is the object to be frozen is suppressed to be higher than the temperature in the freezer compartment, and the freezing and burning of the food is suppressed. Moreover, since the temperature change of food becomes small, the amount of drip described above is also reduced.

  When the above process is completed (time T5), the control device opens the air path switch 19, closes the air path switch 20, and opens the air path switch 18, and supplies the supply air paths 15, 16. Send cooling air to Then, a cooling operation is performed. In this process, since cold air is supplied to both the lower freezer compartment 6 and the like and the refrigerator compartment 3, the voltage of the blower 30 is set high to ensure a sufficient amount of air flow.

  And if the internal temperature of the refrigerator compartment 3 is cooled to predetermined temperature, the air path switch 19 will be in an open state, and the air path switch 20 and the air path switch 18 will be in a closed state (time T6). Thereby, cold air is supplied to the ice making chamber 4, the upper freezing chamber 5, and the lower freezing chamber 6. Moreover, in this process, in order to supply cold air only to a freezer compartment, the voltage of the air blower 30 is set inside.

  In this embodiment, only the lower freezer compartment 6 and the like are cooled after the pre-cooling 2 process is completed as described above. Therefore, the air path switch 18 is closed until the time T5, and the refrigerator compartment 3 Cold air is not supplied. Therefore, the temperature of the refrigerator compartment 3 tends to increase.

  Therefore, in this embodiment, in order to suppress an increase in the internal temperature of the refrigerator compartment, cooling is performed before supplying cold air to the refrigerator compartment 3 or the like (for example, from time T0 to time T1 with reference to FIG. 5). The inside of the refrigerator compartment 3 is cooled using the latent heat of frost adhering to the vessel 32. Specifically, referring to FIG. 4, the operation of the compressor is stopped, the air path switch 18 is opened, the air path switch 19 and the air path switch 20 are closed, and in this state the blower 30 is activated. Thereby, air can be circulated between the refrigerator compartment 3 and the cooling chamber 13, and the frost adhering to the cooler 32 with the circulating air can be melted. That is, defrosting can be performed without heating by the defrost heater 33. At the same time, the refrigerator 3 can be cooled using the heat of frost melting without operating the compressor 31. Thereby, the effect that the above-mentioned temperature rise of the refrigerator compartment 3 can be suppressed is produced.

  Next, a refrigerator according to another embodiment of the present invention will be described in detail based on the drawings.

  With reference to FIG. 6A, the air path switch 18 can be provided not in the supply air path 15 but in a partition region between the space 14 and the supply air path 15. In this case, the partition region may be formed by molding a part of the partition body 40 or the partition wall 37 into a predetermined shape, or a partition member may be used separately.

  As shown in FIG. 6B, the air path switch 20 may be provided on a partition wall 37 that serves as a partition region between the space portion 14 and the cooling chamber 13. Even with such a configuration, air can be flowed from the space portion 14 to the cooling chamber 13 by opening the air passage switch 20.

  FIG. 7 is a side sectional view showing a structure around the cooling chamber 13 of the refrigerator 1 according to another embodiment. FIG. 8 is a control time chart showing an outline of the defrosting operation control of the refrigerator 1. In addition, about the component which show | plays the same or same effect | action and effect as the refrigerator 1 which concerns on the above-mentioned form, the same number is attached | subjected in FIG.7 and FIG.8, and the description is abbreviate | omitted.

  As shown in FIG. 7, the refrigerator 1 according to the present embodiment is in the return air passage 29a from the lower freezer compartment 6 and upstream of the air passage switch 20, that is, on the lower freezer compartment 6 side. An air path switch 50 is provided.

  The air path switch 50 according to the present embodiment is a so-called motor damper, similarly to the above-described air path switch 18 provided in the supply air path 15.

  Next, the opening / closing operation of the airway switch 50 will be described with reference to FIG. First, in the cooling operation (after time T4), a control device (not shown) opens the air path switch 50. As a result, the air in the lower freezer compartment 6 flows through the return air passage 29 a and returns to the cooling chamber 13.

  On the other hand, from the start of the defrosting operation (time T0) to the end of the second precooling step (time T4), the control device closes the return air passage 29a by closing the air passage switch 50. This prevents the air in the cooling chamber 13 warmed by the defrost heater and the temperature-adjusting air circulating through the space 14 from flowing into the lower freezing chamber 6 (reverses flow). Can do. As a result, the temperature rise of the storage room due to the defrosting operation can be suppressed.

  As mentioned above, although the refrigerator 1 which concerns on embodiment of this invention was demonstrated, this invention is not limited to this, A various change is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Heat insulation box 2a Outer box 2b Heat insulation material 2c Inner box 2d Vacuum heat insulation material 3 Refrigeration room 4 Ice making room 5 Upper freezing room 6 Lower freezing room 7 Vegetable room 8a, 8b Door 9 Door 10 Door 11 Door 12 Door 13 Cooling Chamber 13a Opening part 13b Opening part 14 Space part 15 Supply air path 16 Supply air path 17 Connection air path 18 Air path switch 19 Air path switch 20 Air path switch 21 Outlet 22 Outlet 23 Outlet 24 Outlet 25 Air outlet 26 Return port 27 Return port 28 Return ports 29, 29a, 29b Return air passage 30 Blower 31 Compressor 32 Cooler 33 Defrost heater 34 Heat insulation partition wall 35 Partition wall 36 Heat insulation partition wall 37 Partition wall 38 Air channel partition wall 39 Airway partition wall 40 Partition body 41 Airway 42 Shelf 43 Storage container 44 Storage pocket 45 Storage pocket 46 Storage container 47a, 47b Storage container 48 Storage container 49 Machine room 50 Airway switch

Claims (4)

A refrigerator room,
A freezer room,
A cooling chamber in which a cooler that cools the air supplied to the refrigerating chamber and the freezing chamber is stored;
Defrosting means for defrosting the cooling chamber;
A blower wherein the cooled cold air cooler seen write sent to the refrigerating chamber or the freezing chamber, the wind can be varied in three steps,
A first air passage switch interposed in an air passage connecting the blower and the refrigerator compartment;
A second air passage switch interposed in an air passage connecting the blower and the freezer compartment,
It said first air passage switching device and the second air passage switch is in the defrosting means performs up the frost is closed,
By supplying the cold air to the freezer compartment by operating the blower with the first air path switch closed and the second air path switch open for a certain time after the defrosting is completed,
After the fixed time has elapsed, the blower is operated by opening the first air path switch and the second air path switch, and the cold air is supplied to the refrigerator compartment and the freezer compartment ,
Further, after the defrosting is completed and before supplying the cold air to the refrigerator compartment or the freezer compartment, the first air path switch and the second air path switch are closed, and the blower By circulating the cold air, the cooling chamber is pre-cooled,
The refrigerator characterized in that the air blowing capacity of the blower when circulating the cold air is lower than when supplying the cold air to the refrigerator compartment or the freezer compartment . The blowing capacity of the blower is
2. The refrigerator according to claim 1, wherein the supply of the cold air to the refrigerator compartment and the freezer compartment is higher than the supply of the cold air to the freezer compartment. A space disposed in front of the cooling chamber;
A third air path switch interposed in an air path in which the cold air blown by the blower returns to the cooling chamber through the space portion, and
The temperature of the cooling chamber is lowered by closing the first air path switch and the second air path switch, opening the third air path switch, and circulating the cold air. The refrigerator according to claim 1 or 2 . In a state where frost is attached to the cooler, with the compressor stopped, the first air passage switch is opened, and air in the cooling chamber is supplied to the refrigerator compartment. The refrigerator according to any one of claims 1 to 3 , wherein the refrigerator is characterized.

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