JP2013200074A - Icebox and running method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an inflow of warm air into a storeroom upon defrosting or upon a start of cooling running, in addition to prevent heat transfer from a cooling room to the storeroom, and to suppress a rise of a temperature inside the storeroom low.SOLUTION: Part of a supply air course 16 is divided by a partition body 40 to form a space part 14 linked together to a cooling room 13 via a sending aperture part 13a. A switchable first aperture part 19 is provided in a partition area of the space part 14 and the divided supply air course 16, and a switchable second aperture part 20 is provided in a partition area of the space part 14, and a return air course 29 or the cooling room 13. Thus, the heat transfer from the cooling room 13 to storerooms 4 to 6 can be reduced. Further, the first aperture part 19 is in a closed state, the second aperture part 20 is in an open state, and cooling by a cooler 32 and ventilation by a ventilator 30 are carried out, whereby the space part 14 is used as a circulating air path, and air of the space part 14 and the cooling room 13 is circulated for cooling, thereby adjusting the temperature.

Description

  The present invention relates to a refrigerator that stores food or the like in a storage room in a cold state, and particularly relates to a refrigerator that can suppress an increase in temperature in the storage room at the time of defrosting operation or at the start of cooling operation.

  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 for preventing warm air during the defrosting operation from entering the storage chamber, a damper is provided in the cooling air passage, the damper is closed during the defrosting operation, a shutter is provided in the fan, and the shutter is installed. A closing 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, as another example of the prior art, it is known that after the defrosting operation is completed, the start of operation of the blower is delayed from the start of cooling by the cooler (for example, Patent Document 2).

  In the refrigerator disclosed in Patent Document 2, after the defrosting operation is finished, only the compressor is operated with the fan stopped, the temperature of the cooler is lowered, the warm air filling the cooling chamber is cooled, and the operation of the compressor is started. The fan is rotated with a delay to blow cool air. Thereby, the temperature rise of the freezer compartment by defrost operation is reduced.

JP 2009-250476 A (page 4-5, FIGS. 4, 5) JP 2002-195729 (page 4)

  However, as shown in FIG. 9, in the conventional refrigerator provided with a damper and a shutter, the defrosting warm air can be prevented from flowing into the storage room during the defrosting operation. In addition, the temperature in the storage chamber increases. 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.

  In addition, after the defrosting operation is finished, in the method of starting the cooling by the cooler while the operation of the blower is stopped and cooling the air in the cooling chamber, the temperature rise in the storage chamber immediately after the start of the cooling operation can be kept low. Although it was possible, the effect was insufficient. That is, by operating the cooler with the blower stopped, the air around the cooler and the air below the cooler can be cooled, but heat transfer from the cooler to the air is performed under natural convection. Therefore, it is difficult to cool the air accumulated above the cooler or the air in the air passage. For this reason, when starting the cooling operation, warm air above the cooling chamber and in the air passage flows into the storage chamber.

  Moreover, in the method of performing cooling with a cooler without operating the blower, heat transfer efficiency is poor because the air side is in the condition of natural convection, and the cooling time (precooling time) until the start of blowing becomes long. There is also a point. Therefore, since the inside of the storage chamber cannot be cooled during that time, the temperature inside the storage chamber rises due to heat penetration from the outside or heat transfer from the cooler side.

  When the temperature change in the storage chamber increases due to such a temperature increase in the storage chamber, a temperature difference between the frozen food and the storage chamber occurs, particularly in the freezer compartment, and the food is dried due to moisture sublimation due to the water vapor pressure difference. Problem arises (so-called freeze-burning). In addition, when the food is thawed and re-frozen due to a large temperature change in the storage chamber, there is a problem that the ice crystals inside the food increase and the cells of the food are destroyed (so-called drip).

  The present invention has been made in view of the above circumstances, and prevents warm air from flowing into the storage chamber at the time of defrosting or starting cooling operation, and also prevents heat transfer from the cooling chamber to the storage chamber. And it aims at providing the refrigerator which can suppress the temperature rise in a storage chamber low.

  The refrigerator of the present invention includes a storage chamber, a supply air passage for flowing air to the storage chamber, a return air passage for flowing air from the storage chamber, and a feed opening for allowing the air to flow out to the supply air passage. And a cooling chamber having a return opening for allowing the air from the return air passage to flow therein, a cooler provided inside the cooling chamber for cooling the air flowing from the return opening, and the feed opening In the refrigerator provided with the blower provided in the section, outside the cooling chamber, at least a part of the supply air passage is partitioned, and a space portion connected to the cooling chamber through the feed opening is formed. Provided in a partition, a first opening that can be opened and closed provided in a partition region between the space and the partitioned supply air passage, and a partition region between the space and the return air passage or the cooling chamber. A second opening that can be opened and closed. And wherein the Rukoto.

  According to the refrigerator of the present invention, a part of the supply air passage is partitioned by the partition and a space is formed outside the cooling chamber, that is, the front surface, so that heat transfer from the cooling chamber to the storage chamber is reduced. can do. That is, since the space portion and the partitioned supply air path are arranged between the freezing room and the storage room, the cooling room is compared with the case where the cooling room and the storage room are partitioned only by the partition wall. The thermal resistance between the storage room and the storage room can be increased. As a result, for example, when the temperature of the cooling chamber is high, such as during a defrosting operation, an increase in the temperature of the storage chamber can be suppressed low.

  According to the refrigerator of the present invention, since the first opening that can be opened and closed is provided in the partition region between the space and the partitioned supply air passage, the first opening is closed. Thus, it is possible to prevent warm air in the cooling chamber from flowing into the storage chamber. As a result, it is possible to prevent an increase in the temperature of the storage room due to the inflow of warm air.

  Moreover, since the refrigerator of the present invention has a second opening that can be opened and closed in a partition region between the space and the return air passage or the cooling chamber, the air temperature of the space and the cooling chamber is high. In addition, the air can be returned to the cooling chamber without flowing into the storage chamber. That is, when the first opening is in the closed state, the second opening is in the open state, and the blower is operated, the air flowing out from the feed opening in the cooling chamber flows through the space, It returns to the cooling chamber through the opening.

  Further, as described above, the air in the space and the cooling chamber can be efficiently cooled by cooling with a cooler while the air in the cooling chamber is circulated using the space as an air path. it can. As a result, the temperature of the air in the space and the cooling chamber can be adjusted without increasing the temperature of the storage chamber.

  Then, after that, the first opening is opened and the second opening is closed, so that the air that has been cooled and adjusted to a predetermined temperature is supplied to the storage chamber as described above. Can do. As a result, the temperature change of the storage chamber can be suppressed to a small level.

  Further, the partition according to the present invention is arranged so as to partition the freezing supply air passage for flowing the cooling air to the freezer compartment and the space portion, so that the cold insulation temperature is low and the heat from the cooling compartment is reduced. For a freezer compartment that is particularly susceptible to influence, the temperature change can be kept small.

  Further, since the refrigerator of the present invention is provided with the air path switch in the refrigeration supply air path for flowing cooling air to the refrigerating room, the air flow to the refrigerating room can be increased by closing the air path switch. Inflow can be prevented.

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 side surface sectional drawing of the (A) 1st opening part periphery and the (B) 2nd opening part periphery which show the modification of the refrigerator which concerns on embodiment of this invention. It is a control time chart which shows the defrost operation control 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 other embodiment of this invention. It is a control time chart which shows the defrost operation control of the refrigerator which concerns on other embodiment of this invention. It is (A) front view and (B) fan peripheral view which show the example of the refrigerator of a prior art.

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

  FIG. 1 is a front view showing a schematic structure of the refrigerator 1 according to the present embodiment. FIG. 2 is a side sectional view of the refrigerator 1. FIG. 3 is a diagram schematically showing the cooling air passage configuration of the refrigerator 1. FIG. 4 is a side sectional view showing the structure around the cooling chamber 13 of the refrigerator 1. FIG. 5 is a side cross-sectional view showing a modification of the refrigerator 1, where (A) shows the periphery of the first opening 19 and (B) shows the periphery of the second opening 20. FIG. 6 is a control time chart showing an outline of the defrosting operation control of the refrigerator 1.

  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 each storage room, 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 freezing room 6, and the lowermost stage is the vegetable room 7.

  The front surface of the heat insulation box 2 is opened, and the heat insulation doors 8a, 8b, 9, 10, 11, 12 are opened and closed at the openings corresponding to the storage chambers 3, 4, 5, 6, 7, respectively. It is provided freely. The refrigerator compartment doors 8a and 8b divide and block the front surface of the refrigerator compartment 3, and the left upper and lower parts of the refrigerator compartment door 8a and the upper right lower part of the refrigerator compartment door 8b are rotatably supported by the heat insulating box 2. Further, the ice making room door 9, the freezing room door 10, the freezing room door 11, and the vegetable room door 12 are integrally combined with a storage container, which will be described later, and are supported by the heat insulating box 2 so that they can be pulled out in front of the refrigerator 1. Has been.

  As shown in FIG. 2, the heat insulation box 2 which is the main body of the refrigerator 1 is arranged with a steel plate outer box 2a having an opening on the front surface and a gap in the outer box 2a. It is composed of a synthetic resin inner box 2c having an opening, and a polyurethane foam heat insulating material 2b filled and foamed 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 freezer compartment 5 and the freezer compartment 6 provided in the lower compartment are divided by a partition wall 35 formed with a vent hole through which cool air can flow. The freezer compartment 6 and the vegetable compartment 7 are separated 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 refrigerator compartment doors 8a and 8b. The other storage chambers 4, 5, 6, and 7 are provided with storage containers 46, 47a, 47b, and 48 that can be pulled out integrally with the heat insulating doors 9, 10, 11, and 12, respectively. . The storage container disposed in the ice making chamber 4 does not appear in the drawing. Each of the storage chambers 3 to 7 in the storage chamber 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. Yes.

  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. Further, as the pressure reducing means, instead of the capillary tube, other types of pressure reducing means, for example, a temperature type expansion valve, an electronic type expansion valve, a constant pressure type expansion valve, or the like may be employed.

  A supply air passage 15 as a refrigeration supply air passage 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 back surface of the freezer compartment 6. The supply air passage 16 is partitioned from the storage chambers 4 to 6 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 freezing chamber 5, and an air outlet 24 for flowing cold air to the freezing chamber 6. ing. 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.

  Further, the supply air passage 15 and the space portion 14 communicate with each other via an air passage switch 18. 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 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 cooling chamber partition wall 37 made of synthetic resin.

  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 to cool the air outside the tube. Of course, other types of heat exchangers such as a heat exchanger using a flat porous tube or a deformed tube may be employed as the cooler.

  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 opening 27 of the freezer compartment 6 and the return opening 28 of the vegetable compartment via a return air passage 29 (29a, 29b).

  A blower 30 for circulating cool 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 on the front surface of the cooling chamber partition wall 37 so that the surface facing the cooling chamber 13 has a concave shape, the peripheral portion of which is a cooling chamber partition. It is assembled so as to abut against the wall 37. 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 14 so that the peripheral edge abuts the cooling chamber partition wall 37.

  As a result, the supply air passage 16 is formed so as to be sandwiched between the air passage partition wall 39 and the partition body 40 at the back of the storage chambers 4 to 6, and further, the partition body 40 and the cooling chamber partition wall 37 at the back thereof. A space 14 is formed so as to be sandwiched between the two. Thus, in the refrigerator 1 which concerns on this embodiment, since it has the supply air path 16 and the space part 14 which were divided between the storage chambers 4-6 and the cooling chamber 13, from the cooling chamber 13 to the storage chambers 4-4. Heat transfer to 6 can be reduced.

  In addition, various deformation | transformation can be considered for the contact location and joining method of the partition body 40, the cooling chamber partition wall 37, and the air-path partition wall 39. FIG. For example, it is also possible to employ a configuration in which the peripheral portions of the partition members 37, 39, and 40 are brought into contact with the inner surface of the inner box 2 c (see FIG. 2) of the heat insulating box 2 and the lower surface of the heat insulating partition wall 34. .

  Further, a heat insulating member (not shown) such as a foamed polystyrene (PS) sheet or a foamed polyethylene (PE) sheet may be attached to the partition body 40, the cooling chamber partition wall 37, and the air passage partition wall 39, for example. good. Thereby, the thermal resistance between the cooling chamber 13 and the storage chambers 4 to 6 can be increased, and heat transfer from the cooling chamber 13 to the storage chambers 4 to 6 can be further reduced.

  In addition, a first opening 19 that can be opened and closed is provided in the partition 40 that is a partition region between the supply air passage 16 and the space 14. A second opening 20 that can be opened and closed is provided in a partition region between the space 14 and the return air passage 29. In the present embodiment, so-called motor dampers are employed as the first opening 19 and the second opening 20 in the same manner as the air path switch 18 described above. Of course, other types of opening / closing devices may be used as the first opening 19 and the second opening 20.

  Thus, since the refrigerator 1 which concerns on this embodiment is provided with the space part 14, the 1st opening part 19, and the 2nd opening part 20, the 1st opening part 19 and the 2nd opening part 20 are provided. By closing both the openings 20, it is possible to block the feed opening 13 a with respect to the supply air passage 16 and prevent the warm air in the cooling chamber 13 from flowing into the storage chambers 4 to 6.

  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.

  In addition, by closing both the first opening 19 and the air path switch 18 and opening the second opening 20, the air flowing out from the feed opening 13 a is separated from the space 14, the second It is possible to form an air path that sequentially flows through the opening 20, the return air passage 29, and the return opening 13b to return to the cooling chamber 13. That is, the space portion 14 serves as an air path for circulating the air in the cooling chamber 13 without flowing into the storage chamber.

  As shown in FIG. 5A, the air path switch 18 can be provided not in the supply air path 15 but in a partition region between the space portion 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 cooling chamber partition wall 37 into a predetermined shape, or a partition member may be used separately.

  In addition, as shown in FIG. 5B, the second opening 20 may be provided in a cooling chamber partition wall 37 that serves as a partition region between the space 14 and the cooling chamber 13. Even with such a configuration, air can flow from the space 14 to the cooling chamber 13 by opening the second opening 20.

  In addition, the refrigerator 1 according to the present embodiment includes a control device that does not appear in the drawing and performs various operations that do not appear in the drawing, performs lighting, and the like. Yes.

  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 first opening 19 is opened, the second opening 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 discharged into the space 14 is adjusted to an appropriate flow rate by the air path switch 18, flows to the supply air path 15, and is supplied from the outlet 21 to the refrigerator compartment 3. 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 first opening 19 and flows to the supply air passage 16, and the ice making chamber 4 and the upper freezing chamber 5 through the outlets 22 and 23. Supplied to each. Then, the cold air flows into the freezer compartment 6 through an opening formed in the partition wall 35.

  Furthermore, a part of the cooling air that has flowed to the supply air passage 16 through the first opening 19 is supplied from the outlet 24 to the freezer compartment 6. Then, the air inside the freezer compartment 6 flows from the return port 27 to the inside of the cooling chamber 13 through the return air passage 29 a and 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. 6, the operation | movement at the time of a defrost operation is demonstrated suitably with reference to FIG.2 and FIG.4. 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.

  A time T0 in FIG. 6 indicates the start of the defrosting operation. When performing the defrosting operation, the control device (not shown) stops the operation of the compressor 31, stops the blower 30, closes both the first opening 19 and the second opening 20, and opens and closes the air path. The supply air passage 15 is closed by the vessel 18. 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 this water evaporates with the heat from the compressor 31 grade | etc., In the said evaporating dish.

  The heat generated by the defrost heater 33 warms the air in the cooling chamber 13. However, in the refrigerator 1 according to the present embodiment, as described above, a part of the supply air passage 16 is partitioned by the partition body 40, the first opening 19 and the second opening 20 are closed, and the air passage Since the supply air passage 15 is closed by the switch 18, warm air can be prevented 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 second opening 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).

  Here, in the above-described second precooling step, 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.

  Time T4 indicates the end of the second precooling step. 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 precooling process is determined. Note that the second pre-cooling step may be performed for a predetermined time by a timer or the like.

  When the second pre-cooling step is completed (time T4), the control device opens the first opening 19, closes the second opening, opens the air path switch 18, and supplies the air supply path. 15 and 16 are sent with the above-mentioned temperature-controlled air. And the above-mentioned cooling operation is performed.

  The target cooling temperature in the second precooling step can be set to a suitable value as appropriate according to the cooling load. In addition, the opening / closing timings of the first opening 19, the second opening 20, and the air path switch 18 can be changed as appropriate in relation to the target cooling temperature. For example, after cooling to the first target cooling temperature having a high set temperature, the first opening 19 is kept closed, the second opening 20 is closed, and the air path switch 18 is opened. By setting the state, it is possible to allow cooling air to flow only to the refrigerator compartment 3 through the supply air passage 15.

  Then, when the temperature is further lowered and cooled to the second target cooling temperature lower than the first target cooling temperature, the first opening 19 is opened and the ice making chamber 4 is connected via the supply air passage 16. Cold air can also be supplied to the upper freezer compartment 5 and the freezer compartment 6. Thereby, a highly efficient cooling operation can be performed.

  Next, the refrigerator which concerns on the 2nd Embodiment of this invention is demonstrated in detail based on drawing.

  FIG. 7 is a side cross-sectional view showing the structure around the cooling chamber 13 of the refrigerator 1 according to the present 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 similar operation | movement and effect as the refrigerator 1 which concerns on already demonstrated 1st Embodiment, 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 29 a from the freezer compartment 6, and is upstream of the second opening 20, that is, on the freezer compartment 6 side. A road 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. However, the present invention is not limited to this, and various opening / closing devices can be employed as the airway switch 50.

  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. Thereby, the air in the 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. Thereby, it is possible to prevent the air in the cooling chamber 13 heated by the defrosting heater or the temperature adjusting air circulating through the space portion 14 from flowing into the freezing chamber 6 (reverse flow). it can. As a result, the temperature rise of the storage chambers 4 to 6 due to the defrosting operation can be suppressed.

  In the second embodiment described above, the configuration of the air path switch 18 and the second opening 20 can be modified as shown in FIG.

  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 ... Thermal insulation box 3 ... Refrigeration room 4 ... Ice making room 5 ... Upper stage freezing room 6 ... Freezing room 7 ... Vegetable room 13 ... Cooling room 13a ... feed opening 13b ... return opening 14 ... space 15 ... refrigeration supply air passage 16 ... refrigeration supply air passage 18 ... air passage switch 19 ... first 1 opening 20 ... second opening 30 ... blower 32 ... cooler 33 ... defrost heater 40 ... partition body

Claims (9)

A storage room;
A supply air passage for flowing air into the storage chamber;
A return air passage for flowing the air from the storage room;
A cooling chamber having a feed opening for allowing the air to flow into the supply air path, and a return opening for allowing the air from the return air path to flow;
A cooler that is provided inside the cooling chamber and cools the air flowing in from the return opening;
In a refrigerator provided with a blower provided in the feed opening,
On the outside of the cooling chamber, a partition that partitions at least a part of the supply air passage and forms a space connected to the cooling chamber via the feed opening,
A first openable and closable opening provided in a partition region between the space and the partitioned supply air path;
A refrigerator having a second opening that can be freely opened and closed provided in a partition region between the space and the return air passage or the cooling chamber. The storage chamber is divided into at least a refrigeration chamber and a freezing chamber, and the supply air passage has a supply air passage for refrigeration for flowing the air to at least the freezing compartment,
The partition is arranged so as to partition the supply air passage for refrigeration and the space portion,
When the first opening is in a closed state and the second opening is in an open state, the air flowing out from the feed opening of the cooling chamber is transferred from the return opening to the space. The refrigerator according to claim 1, wherein the refrigerator is an air path for flowing into the cooling chamber. The supply air passage has a refrigeration supply air passage for flowing the air to the refrigeration chamber,
The refrigerator according to claim 2, wherein the refrigeration supply air passage is connected to the space portion, and the refrigeration supply air passage is provided with an air passage switch. A storage room;
A supply air passage for flowing air into the storage chamber;
A return air passage for flowing the air from the storage room;
A cooling chamber having a feed opening for allowing the air to flow into the supply air path, and a return opening for allowing the air from the return air path to flow;
A cooler that is provided inside the cooling chamber and cools the air flowing in from the return opening;
A blower provided in the feed opening;
On the outside of the cooling chamber, a partition that partitions at least a part of the supply air passage and forms a space connected to the cooling chamber via the feed opening,
A first openable and closable opening provided in a partition region between the space and the partitioned supply air path;
A second opening that is openable and closable provided in a partition region between the space and the return air passage or the cooling chamber,
The first opening is closed, the second opening is open, the space is used as an air path for circulating the air to the cooling chamber, cooling by the cooler and blowing by the blower And adjusting the temperature of the air in the space and the cooling chamber.   After adjusting the temperature of the air in the space and the cooling chamber, the first opening is opened, the second opening is closed, and the temperature-adjusted air is supplied to the supply air passage. The refrigerator operating method according to claim 4, wherein the refrigerator is supplied to the storage room. A defrosting means for defrosting the cooling chamber,
Both the first opening and the second opening are closed, defrosted by the defrosting means, and after the defrosting is stopped, the second opening is opened, and the space and 6. The method of operating a refrigerator according to claim 5, wherein the temperature of the air in the cooling chamber is adjusted. The storage room is divided into at least a refrigerator room and a freezer room,
The supply air path flows the air to the freezer compartment, and the supply air path for refrigeration partitioned from the space by the partition,
The refrigerator having a refrigeration supply air passage that flows the air to the refrigerating chamber, is connected to the space portion, and is provided with an air passage switch in the air passage,
The first opening is closed, the second opening is opened, the refrigeration supply air passage is closed by the air passage switch, and the air in the space and the cooling chamber is closed. The method for operating a refrigerator according to claim 4, wherein the temperature is adjusted.   After adjusting the temperature of the air in the space and the cooling chamber, the first opening is opened, the second opening is closed, and the refrigeration supply air is supplied by the air path switch. 8. The passage is opened, and the temperature-adjusted air is supplied to the freezing room or the refrigerating room via the refrigerating supply air path or the refrigerating supply air path, respectively. How to operate the refrigerator. A defrosting means for defrosting the cooling chamber,
Both the first opening and the second opening are closed, the refrigeration supply air passage is closed by the air passage switch, defrosting is performed by the defrosting means, and the defrosting is stopped. 9. The method for operating a refrigerator according to claim 8, wherein the second opening is opened to adjust the temperature of the air in the space and the cooling chamber.

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