JP6469966B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator.

  As background arts in this technical field, there are JP-A-2007-113825 (Patent Document 1) and JP-A-7-180951 (Patent Document 2).

In Patent Document 1, two food rooms in which the inside is at a freezing temperature, a vegetable room sandwiched directly between the food room and the food room from above and below, and when the vegetable room falls below a specified temperature are turned on. The vegetable compartment is connected to the condenser separately from the temperature compensation heater, and is always warmed by heat radiation from the refrigeration cycle pipe that is a part of the condenser. Yes.

In patent document 2, the refrigerator which has a cooling function with the refrigerating cycle which consists of a compressor, a heat radiating pipe, a capillary tube, and an evaporator, the cold air flow inlet provided in this refrigerator and the inflow / outflow of cold air, a cold air flow outlet, and a cold air flow rate A drying chamber having a control unit, a heating unit in which a part of the heat radiating pipe is arranged in the drying chamber so that the heating refrigerant of the refrigeration cycle flows, and a refrigerant flow path and a flow rate from the refrigeration cycle are set in the heating unit. The refrigerator with a drying function characterized by comprising the control valve to control is described.

JP2007-1113825A JP-A-7-180951

In the refrigerator described in Patent Document 1, a part of the condenser is arranged in the vegetable room, and the vegetable room is constantly heated during the compressor operation, so the heat load increases for the vegetable room. The energy-saving performance may deteriorate.

  In the refrigerator described in Patent Document 2, the A channel that flows the refrigerant to the drying chamber heating pipe on the upstream side of the clean pipe (part of the heat radiating pipe), and the B channel that bypasses the drying chamber heating pipe and flows as it is. It is the structure which switches. With this configuration, there is a risk that insufficient heating will occur when the refrigerant is passed through both the drying chamber heating pipe and the clean pipe arranged in series.

The present invention has been made in view of the problems as described above, and provides a refrigerator having high energy saving performance and suppressing shortage of heating even when a part of the refrigeration cycle is used as a plurality of heating means. Objective.

In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, a storage room in a refrigeration temperature zone, a storage room in a refrigeration temperature zone, a storage room in the refrigeration temperature zone, and the refrigeration temperature zone. A heat insulating partition that partitions the storage chamber, a compressor, a heat radiating means, a pressure reducing means, and a refrigeration cycle connected to a cooler, wherein the heat radiating means is a partition in front of the storage room in the refrigeration temperature zone. A first heating means for heating a part, and a second heating means provided in the heat insulating partition for heating a storage room in a refrigerated temperature zone, the first refrigerant including the first heating means The flow path and the second refrigerant flow path including the second heating means are arranged in parallel, and include a refrigerant flow path switching means for switching between the first refrigerant flow path and the second refrigerant flow path. It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, even if it uses a part of refrigerating cycle as a some heating means, the energy-saving performance is high and the refrigerator which suppressed shortage of heating can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a front view of the refrigerator which concerns on Example 1 of this invention. It is AA sectional drawing of the refrigerator shown in FIG. It is a block diagram of the refrigerating cycle of the refrigerator which concerns on Example 1 of this invention. It is an arrangement plan of a heat dissipation side pipe of a refrigerator concerning Example 1 of the present invention. It is a fragmentary sectional view of an upper heat insulation partition wall, a lower heat insulation partition wall, and a heat insulation partition part. It is BB sectional drawing of the refrigerator shown in FIG. It is a front view of the vegetable room of the state which removed the vegetable room door and the storage container. In the refrigerating cycle which concerns on Example 1 of this invention, it is a control conceptual diagram in the case of switching the cycle A and the cycle B. FIG. It is a time chart which shows an example of the cooling operation of the refrigerator which concerns on Example 1 of this invention. It is explanatory drawing of the refrigerating cycle which concerns on Example 1 of this invention, Comprising: It is a figure explaining the state of a refrigerant | coolant at the time of flowing a refrigerant | coolant simultaneously to several heating means. It is the Mollier diagram which showed the driving | running state of the refrigerating cycle which concerns on Example 1 of this invention. It is a figure which shows the refrigerating cycle of a comparative example, Comprising: It is the example which has arrange | positioned the heating means in series. It is a figure explaining the state of the refrigerant | coolant of the refrigerating cycle of the comparative example of FIG. It is a Mollier diagram which shows the driving | running state of the refrigerating cycle of the comparative example of FIG. It is a block diagram of the refrigerating cycle of the refrigerator which concerns on Example 2 of this invention. It is the figure which showed typically the switching pattern of the refrigerant flow path by a refrigerant flow path switching means (four-way valve). It is a block diagram of the refrigerating cycle of the refrigerator which concerns on Example 3 of this invention. It is explanatory drawing of the refrigerating cycle which concerns on Example 3 of this invention, Comprising: It is a figure explaining the state of a refrigerant | coolant at the time of flowing a refrigerant | coolant simultaneously to several heating means. It is a block diagram of the refrigerating cycle of the refrigerator which concerns on Example 4 of this invention. It is explanatory drawing of the refrigerating cycle which concerns on Example 4 of this invention, Comprising: It is a figure explaining the state of a refrigerant | coolant at the time of flowing a refrigerant | coolant simultaneously to several heating means.

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

  FIG. 1 is a front view of a refrigerator according to Embodiment 1 of the present invention. As shown in FIG. 1, the refrigerator 1 according to the present embodiment includes a refrigerator room 2 from the top, an ice making room 3 provided on the left and right, an upper freezer room 4, a lower freezer room 5, and a vegetable room 6 in this order. . Hereinafter, the ice making room 3, the upper freezer room 4, and the lower freezer room 5 may be collectively referred to as the freezer room 7 in some cases. The front of the refrigerating room 2 is provided with rotary refrigerating room doors 2a and 2b which are divided into left and right, and constitute a so-called French door. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are each provided with a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a may be simply referred to as doors 2a, 2b, 3a, 4a, 5a, and 6a. is there. An operation unit 50 is provided on the front surface of the refrigerator compartment door 2a for performing temperature setting operation in the cabinet. Door hinges (not shown) for fixing the refrigerator compartment doors 2a and 2b are provided on the outer upper portion and the outer lower portion of the refrigerator compartment 2, and the door hinges on the outer upper portion are door hinge covers in consideration of design and protection of parts. 53. Further, the outside temperature sensor 52 and the outside humidity sensor 120 are provided, for example, inside the door hinge cover 53 of the refrigerator 1 as positions that are not easily affected by the temperature inside the refrigerator 1.

  Next, FIG. 2 is an AA cross-sectional view of the refrigerator shown in FIG. The external space and internal space of the refrigerator 1 are separated by a heat insulating box 10 formed by filling a foam heat insulating material between the outer box 10a and the inner box 10b. In addition to the foam heat insulating material, a plurality of vacuum heat insulating materials 25 are mounted between the outer box 10a and the inner box 10b to enhance the heat insulating performance. Each storage room is separated from the refrigerator compartment 2 from the upper freezer compartment 4 and the ice making room 3 by the upper heat insulating partition 28, and the lower freezer compartment 5 and the vegetable compartment 6 are separated from each other by the lower heat insulating partition 29. ing. A plurality of door pockets 33a, 33b, 33c are provided inside the refrigerator compartment doors 2a, 2b, and a plurality of shelves 34a, 34b, 34c, 34d are provided in the refrigerator compartment 2 (sometimes collectively referred to as a shelf 34). Are provided in the vertical direction and are partitioned into a plurality of storage spaces.

  A storage chamber 35 is provided at the bottom of the refrigerator compartment 2 and above the upper heat insulating partition 28. The storage room 35 is a storage room in a chilled temperature range that is set lower than the temperature range of the refrigerator compartment 2. The temperature adjustment in the storage chamber 35 is performed by, for example, a dedicated air volume adjusting device (not shown) provided in the middle of the refrigeration chamber cool air duct 11 at the rear of the storage chamber 35. If it is too cold, it may be heated by a temperature adjusting heating means (as an example, the heater 19) provided in the lower part of the storage chamber 35. The storage chamber 35 is not limited to the chilled temperature zone but may be a temperature zone lower than the chilled temperature zone and higher than the freezing temperature zone, that is, an ice temperature zone or a partial temperature zone.

  Between the upper freezing room 4 and the ice making room 3 and the lower freezing room 5, a heat insulating partition 40 is provided. Partition covers 36a, 36b, and 36c are provided on the sides of the upper heat insulating partition wall 28, the lower heat insulating partition wall 29, and the heat insulating partition portion 40 that are in contact with any of the doors 2a, 2b, 3a, 4a, 5a, and 6a. is there. The upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are provided with storage containers 4b, 5b, 6b that move integrally with the doors 4a, 5a, 6a provided in front of the respective compartments. The storage containers 4b, 5b and 6b can also be pulled out by pulling out 5a and 6a to the near side. The ice making chamber 3 is also provided with a storage container that moves integrally with the door 3a, and the storage container 3b can also be pulled out by pulling the door 3a forward.

  The cooler 14 is provided in a cooler storage chamber 8 provided substantially at the back of the lower freezer compartment 5, and the cold air that has exchanged heat with the cooler 14 is cooled by the fan 9 provided above the cooler 14. Each storage of the refrigerator compartment 2, the upper freezer compartment 4, the lower freezer compartment 5, and the ice compartment 3 through the duct 11, the upper freezer compartment cool air duct 12, the lower freezer compartment air duct 13, and the ice making compartment air duct (not shown). It is sent from the discharge ports 11a, 11b, 11c, 12a, 13a and 13b to the chamber. The blowing of cold air to each storage room is controlled by opening and closing the air path by the refrigerator compartment damper 20 and the freezer compartment damper 60. The refrigerator compartment damper 20 and the freezer compartment damper 60 are provided with rotating baffles 20a and 60a, respectively, and the rotation angles of the baffles 20a and 60a are adjusted by motor driving (not shown). That is, the amount of cool air blown is controlled by controlling the amount of opening of the air passage by the refrigerator compartment damper 20 and the freezer compartment damper 60.

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

  A control board 51 equipped with a memory and an interface circuit is arranged behind the upper wall of the refrigerator 1, and the control of the refrigeration cycle and the air blowing system is performed according to the control means stored in the ROM of the control board 51. The control board 51 is covered with a board cover 30 in consideration of design properties and component protection.

In the case of the refrigerating room cooling operation for cooling the refrigerating room 2, the refrigerating room damper 20 is opened, the freezing room damper 60 is closed, and the outlets 11 a, 11 b, 11 c provided in the refrigerating room cold air duct 11 are transferred to the refrigerating room 2. Cold air is sent. The cool air after cooling the refrigerating chamber 2 flows into a cool air return port (not shown) provided in the lower portion of the refrigerating chamber 2 and then returned to the cooler 14.
There are various methods for cooling the vegetable compartment 6, for example, a method of sending cold air to the vegetable compartment 6 after cooling the refrigerator compartment 2, an air volume adjusting device dedicated to the vegetable compartment (as an example, the vegetable compartment damper 13 ( A method of sending the cold air heat-exchanged by the cooler 14 directly to the vegetable compartment 6 using FIG. In the present embodiment, any method may be used for supplying cold air to the vegetable compartment 6. In FIG. 2, the cold air flowing into the vegetable compartment 6 is cooled from the vegetable compartment cold air return portion 18 b through the vegetable compartment cold air return duct 18 from the vegetable compartment side cold air return portion 18 a provided in front of the lower part of the heat insulating partition 29. Flows into the lower part of the container 14 (see FIG. 7).

  In the case of the freezing room cooling operation for cooling the freezing room 7 (the ice making room 3, the upper freezing room 4, the lower freezing room 5), the refrigerating room damper 20 is closed, the freezing room damper 60 is opened, and the upper freezing room cold air duct is opened. 12 and cool air are discharged from a plurality of outlets 12a, 13a and 13b provided in the cooler duct 13 of the lower freezer compartment, and the upper freezer chamber 4, the lower freezer compartment 5 and the ice making chamber 3 are cooled and then frozen. It returns to the cooler 14 from the room cool air return part 17.

  The temperatures of the refrigerator compartment 2 and the freezer compartment 7 are detected by a refrigerator compartment temperature sensor 121 and a freezer compartment temperature sensor 122 provided in each storage space, respectively. Depending on the temperature of each storage space, there may be an operation mode in which the refrigerator compartment 2 and the freezer compartment 7 are simultaneously cooled. In this case, both the refrigerator compartment damper 20 and the refrigerator compartment damper 60 are opened, and the refrigerator compartment 2 and Cool air is blown into the freezer compartment 7.

  Next, FIG. 3 is a configuration diagram of the refrigeration cycle of the refrigerator according to the first embodiment of the present invention. The refrigerant pipe 66 on the discharge side of the compressor 24 is connected to a first radiator 46 that is air-cooled by the machine room fan 45, and the first radiator 46 and the second radiators 41a and 41b (FIG. 4). And the details will be described later). The outlet side of the second radiator 41b is connected to one end of a refrigerant pipe 68, and the other end of the refrigerant pipe 68 is connected to a three-way valve 130 which is an example of a refrigerant flow switching means.

  The compressor 24, the refrigerant pipe 66, the machine room fan 45, and the first radiator 46 are provided in a machine room 61 located at the lower rear of the heat insulating box 10.

  The refrigerant flowing in from the refrigerant pipe 68 connected to the inlet side of the three-way valve 130 bypasses the refrigerant pipe 70 (cycle A which is the first refrigerant flow path) connected to the outlet side of the three-way valve 130 and the refrigerant pipe 70. The bypass pipe 74 (cycle B, which is the third refrigerant flow path) is branched and flows in two directions, and the amount of refrigerant flowing through each is controlled by the three-way valve 130.

  The refrigerant pipe 70 (cycle A) on the outlet side of the three-way valve 130 is connected with a dew condensation prevention pipe 72 as a first heat radiating means. One end of the refrigerant pipe 100 is connected to the outlet side of the dew condensation prevention pipe 72, and the first dryer 77 a is connected to the other end of the refrigerant pipe 100.

  In the middle of the refrigerant pipe 68 connected to the inlet side of the three-way valve 130, one end of the refrigerant pipe 71 is connected so as to branch from the refrigerant pipe 68, and the other end of the refrigerant pipe 71 is connected to the second pipe. The vegetable room heating pipe 73 which is a heating means is connected. A two-way valve 131 that is an example of a refrigerant flow switching means is provided on the upstream side of the vegetable room heating pipe 73 and in the middle of the refrigerant pipe 71. When the two-way valve 131 is opened, the refrigerant flows through the vegetable room heating pipe 73 (cycle C as the second refrigerant flow path). In this embodiment, the three-way valve 130 and the two-way valve 131 are collectively referred to as a refrigerant flow path switching unit, and the first to third refrigerant flow paths are switched by these controls.

  One end of the refrigerant pipe 101 is connected to the outlet side of the vegetable room heating pipe 73, and the other end of the refrigerant pipe 101 is connected to the pipe 100 connecting the dew condensation prevention pipe 72 and the first dryer 77 a at the junction 76. Have joined. In addition, a check valve 75 is provided between the refrigerant pipe 101 and the junction 76 to prevent the refrigerant from flowing back from the refrigerant pipe 101 to the vegetable compartment heating pipe 73.

  A check valve 75 is provided upstream of the junction 76 of the refrigerant pipe 100 and downstream of the condensation prevention pipe 72. Thereby, the reverse flow of the refrigerant from the refrigerant pipe 100 to the dew condensation prevention pipe 72 side is prevented. One end of a refrigerant pipe 78 is connected to the downstream side of the first dryer 77 a, and a first expansion device (decompression unit) 81 is connected to the other end of the refrigerant pipe 78.

  A second dryer 77 b is connected to the downstream side of the bypass pipe 74 connected to the outlet side of the three-way valve 130. One end of a refrigerant pipe 79 is connected to the downstream side of the second dryer 77b, and a second expansion device 82 is connected to the other end of the refrigerant pipe 79. The first throttling device 81 and the second throttling device 82 merge at their downstream junctions 83 and are connected to the refrigerant pipe 84, and the downstream side of the refrigerant pipe 84 is connected to the evaporator 14. Yes. The refrigerant pipe 85 connected to the outlet side of the evaporator 14 is provided with a heat exchanging unit 80 so as to exchange heat with a part of the first expansion device 81 and the second expansion device 82 in the middle. The downstream side of the 85 heat exchanger 80 is connected to the suction side of the compressor 24.

  In the configuration of the present embodiment, a cooling operation with improved energy saving performance with less heat intrusion into the freezer compartment 7 can be performed by the refrigeration cycle in which the refrigerant flows through the bypass pipe 74 (cycle B which is the third refrigerant flow path) ( (See FIGS. 5 and 6). Further, the first expansion device 81 and the second expansion device 82 are selected in accordance with the heat load in the cabinet so that the amount of expansion can be adjusted, and connected to the bypass pipe 74 side with improved energy saving performance. The diaphragm amount of the second diaphragm device 82 is larger than the diaphragm amount of the first diaphragm device 81.

  In this refrigeration cycle configuration, a three-way valve 130 causes a first refrigerant flow path (cycle A) that flows through a dew condensation prevention pipe 72 that is a first heat radiating means, and a bypass pipe 74 that bypasses the first heat radiating means. Three refrigerant flow paths (cycle B) are switched every predetermined time. Moreover, when the temperature of the vegetable compartment 6 becomes below a predetermined temperature, the two-way valve 131 is opened, and the refrigerant is caused to flow through the second refrigerant flow path including the vegetable compartment heating pipe 73 as the second heating means. .

  Here, for example, when the refrigerant is allowed to flow only to the dew condensation prevention pipe 72 (at this time, the two-way valve 131 is closed), the refrigerant may flow backward to the vegetable room heating pipe 73 side. When flowing (at this time, the three-way valve 130 is fully closed), the refrigerant may flow backward to the dew condensation prevention pipe 72 side, and it is assumed that the refrigerant will run short in each refrigeration cycle during operation. Therefore, by providing the check valves 75 on the outlet sides of the dew condensation prevention pipe 72 and the vegetable room heating pipe 73, respectively, the refrigerant shortage due to the reverse flow of the refrigerant is prevented. The three-way valve 130 and the two-way valve 131 can be effectively utilized by arranging them in the machine room 61, for example.

  Next, FIG. 4 is a layout diagram of the heat radiation side pipe of the refrigerator according to the first embodiment of the present invention. The 1st heat radiator 46 is installed in the machine room 61 provided in the back side lower part of the refrigerator 1 (refer FIG. 2). The second radiators 41a and 41b are arranged in the heat insulating walls on the left and right sides of the refrigerator 1, that is, in the heat insulating space between the outer box 10a and the inner box 10b. The dew condensation prevention pipe 72 is embedded in the upper heat insulation partition wall 28, the lower heat insulation partition wall 29, and the heat insulation partition part 40 which divide | segment each store room, respectively (refer FIG. 5).

  FIG. 5 is a partial cross-sectional view of the upper heat insulation partition wall, the lower heat insulation partition wall, and the heat insulation partition portion. Condensation prevention pipes 72 are arranged so as to be in contact with partition covers 36a, 36b, and 36c provided on the end surfaces of the upper heat insulating partition 28, the lower heat insulating partition 29, and the heat insulating partition 40, respectively. When the temperature around the refrigerator 1 is, for example, 30 ° C., the temperature of the dew condensation prevention pipe 72 during steady operation is about 33 ° C., and the freezer compartment 7 adjacent to the upper heat insulating partition 28, the lower heat insulating partition 29, and the heat insulating partition 40. A large temperature difference is formed with respect to (about -20 ° C as an example). The surface of the partition covers 36a, 36b, and 36c and the surrounding air are cooled by the freezer compartment 7 so that the temperature decreases, and moisture in the air near the partition covers 36a, 36b, and 36c causes the partition covers 36a, 36b, and 36c to Condensation may occur on the surface. In order to avoid this, the refrigerant is passed through the dew condensation prevention pipe 72 to heat the partition covers 36a, 36b, 36c (heat flow 110 in FIG. 5) to raise the temperature. On the other hand, the heat released from the dew condensation prevention pipe 72 heats the freezer compartment 7 having a large temperature difference (heat flow 111 in FIG. 5). As described above, the heating of the partition covers 36a, 36b, and 36c by the dew condensation prevention pipe 72 prevents the dew condensation. However, on the other hand, it leads to an increase in the thermal load in the warehouse, which causes the energy saving performance to deteriorate.

  Next, FIG. 6 is a BB cross-sectional view of the refrigerator shown in FIG. 1, and is an appearance of the lower heat insulating partition wall 29 as viewed from the lower freezer compartment 5 side. FIG. 7 is a front view of the vegetable compartment with the vegetable compartment door and storage container removed.

  Due to the influence of the lower freezing room 5 arranged at the upper part of the vegetable room 6, heat transfer occurs through the ceiling part of the vegetable room 6, that is, the lower heat insulating partition wall 29, and the vegetable room 6 tends to become low temperature. A vegetable room heater 26 is disposed in the lower heat insulating partition wall 29, and is connected to the control board 51 via a connection portion 31 of the vegetable room heater 26. A vegetable room heating pipe 73 connected to a refrigerant pipe 71 having a two-way valve 131 is disposed in the lower heat insulating partition wall 29.

  In order to arrange the vegetable room heating pipe 73 in the lower heat insulating partition wall 29, the refrigerant pipe 71 embedded in the heat insulating wall 10 is once extended to the lower heat insulating partition wall 29 and joined to the refrigerant pipe 100 again. As an example of arrangement of the vegetable room heating pipe 73, the vegetable room heating pipe 73 is fixed to a heat insulating material such as styrofoam provided in the lower heat insulating partition wall 29.

  In this configuration, when the temperature of the vegetable compartment 6 is lowered according to the temperature detected by the vegetable compartment temperature sensor 32, heating is performed using at least one of the vegetable compartment heater 26 and the vegetable compartment heating pipe 73. Can do.

  As described with reference to FIG. 2, cold air is supplied to the vegetable compartment 6 via the vegetable compartment damper 47. When the vegetable compartment damper 47 is opened, the cold air 47a is supplied into the vegetable compartment 6, and then the cooler from the vegetable compartment cold air return portion 18b through the vegetable compartment cold air return duct 18 from the cold air return portion 18a on the vegetable compartment side. 14 Cool air flows into the lower part. The vegetable room back side wall surface 16 includes a vegetable room temperature sensor 32 that detects the temperature of the vegetable room 6.

  Next, FIG. 8 is a conceptual diagram of control when switching between cycle A and cycle B in the refrigeration cycle according to Embodiment 1 of the present invention. By switching the three-way valve 130 to the refrigerant pipe 70 (cycle A which is the first refrigerant flow path) and flowing the refrigerant through the dew condensation prevention pipe 72, the partition covers 36a, 36b and 36c are heated, and moisture in the air is Condensation is prevented on the surfaces of the partition covers 36a, 36b, and 36c.

  Here, by controlling the three-way valve 130 and the two-way valve 131 which are the refrigerant flow switching means, the following five refrigerant flow modes (1) to (5) are provided. That is, (1) When flowing the refrigerant through the dew condensation prevention pipe 72 (cycle A which is the first refrigerant flow path), (2) When flowing the refrigerant through the bypass pipe 74 (cycle B which is the third refrigerant flow path) (3) When flowing the refrigerant through the vegetable room heating pipe 73 (cycle C as the second refrigerant flow path), (4) dew condensation prevention pipe 72 (cycle A) and vegetable room heating pipe 73 (cycle C) When flowing the refrigerant at the same time, (5) When flowing no refrigerant through any flow path of the dew condensation prevention pipe 72 (cycle A), the bypass pipe 74 (cycle B), and the vegetable room heating pipe 73 (cycle C).

  Regarding the control of flowing the refrigerant through the dew condensation prevention pipe 72 (cycle A), the temperature sensors and humidity are applied to the partition covers 36a, 36b, 36c covering the respective end faces of the upper heat insulating partition wall 28, the lower heat insulating partition wall 29 and the heat insulating partition portion 40. A sensor is directly attached, and the refrigerant is switched by the three-way valve 130 so that condensation does not occur on the surfaces of the partition covers 36a, 36b, 36c according to the detected temperature and humidity.

  If a temperature sensor and a humidity sensor interfere with a door packing (not shown) in contact with the partition covers 36a, 36b, 36c, the amount of heat intrusion increases through the door packing, and the detected values of temperature and humidity are not good. There is concern about being accurate. Therefore, based on the temperature and humidity detected by the temperature sensor 52 and the humidity sensor 120 provided outside the refrigerator 1, the cycle A side (first refrigerant channel) and the cycle B side (third refrigerant channel) It is possible to employ a configuration for controlling the switching time. An example of this configuration will be further described with reference to FIG. FIG. 8 shows the heating rate (vertical axis) of the dew condensation prevention pipe 72 with respect to humidity (horizontal axis) at a certain temperature. For example, in the case of RH2 where the humidity is high, there is a high possibility of condensation on the surfaces of the partition covers 36a, 36b, and 36c. Therefore, the time (tA2) for which the refrigerant flows through the condensation prevention pipe 72 (cycle A) is lengthened, and the bypass pipe 74 The time (tB2) during which the refrigerant flows in (cycle B) is shortened. On the other hand, in the case of RH1 where the humidity is low, there is little possibility of condensation, so the time for heating the partition covers 36a, 36b, 36c with the condensation prevention pipe 72 may be short, so the condensation prevention pipe 72 (cycle A ), The time for flowing the refrigerant (tA1) may be shortened, and the time for flowing the refrigerant to the bypass pipe 74 (cycle B) (tB1) may be lengthened.

  As described with reference to FIG. 5, the surfaces of the partition covers 36 a, 36 b, and 36 c are designed to prevent condensation by using heat generated by the refrigerant flowing through the condensation prevention pipe 72, but the heating rate of the condensation prevention pipe 72, That is, the longer the time on the cycle A side, the greater the heat intrusion into the freezer compartment 7, and as a result, the energy saving performance tends to deteriorate. In a refrigerator that does not include means for switching the dew condensation prevention pipe 72 (bypass pipe 74), the refrigerant always flows through the dew condensation prevention pipe 72 (cycle A). Then, the heating rate by the dew condensation prevention pipe 72 becomes 100%, and the surface heating of the partition covers 36a, 36b, 36c under the condition where no dew condensation occurs becomes a heat load of the freezer compartment 7 and the energy saving performance is deteriorated.

  Next, FIG. 9 is a time chart showing an example of the cooling operation of the refrigerator according to the first embodiment of the present invention. The cooling operation in a stable state after the interior reaches a predetermined temperature includes a refrigeration operation for cooling the refrigerator compartment 2 (time t2 to t4), a refrigeration operation for cooling the freezer compartment 7 (time t4 to t7), and a compressor. Based on an operation pattern consisting of stops (from time t1 to time t2, from time t7 to time t8), these operations are repeated as long as the ambient temperature does not change or food is not charged. In FIG. 9, the compressor 24 is turned ON when the freezer temperature detected by the freezer temperature sensor 122 rises to TF1 (time t2) while the compressor is stopped. In this case, the temperature of the cooler 14 is in a high state, and the cold air that has exchanged heat with the cooler 14 is not at a temperature for cooling the freezer compartment 7. Therefore, when the compressor 24 is turned on, the refrigerator compartment damper 20 is opened and the freezer compartment damper 60 is closed, and the refrigerator compartment temperature detected by the refrigerator compartment temperature sensor 121 reaches TR2 (time t4). Refrigerate operation until. Thereafter, the refrigerator compartment damper 20 is closed, the freezer compartment damper 60 is opened, and the freezing operation is continued until the freezer compartment temperature reaches TF2 (time t1, t7), and then the compressor 24 is stopped.

  Next, the operation of the three-way valve 130 and the two-way valve 131 will be described. Since the refrigerant from the first radiator 46 to the inlet of the first expansion device 81 or the second expansion device 82 is at a higher temperature and pressure than in the cooler 14, the pressure of the refrigerant 24 when the compressor 24 is stopped. Due to the difference, the refrigerant on the first radiator 46 and the second radiator 41a, 41b (condenser) side flows into the cooler 14 (evaporator) side. As a result, the temperature of the cooler 14 rises, leading to an increase in power consumption. Therefore, in the heat radiation side pipe volume formed from the first heat radiator 46 to the inlet portion of the first throttle device 81 or the second throttle device 82, the first radiator 46, the second radiator 41a, Since the proportion of the pipe volume occupied by 41b is large, when the compressor 24 is stopped, the three-way valve 130 and the two-way valve 131 are fully closed (corresponding to the refrigerant flow mode (5)), and the radiator side (first radiator) 46 and the second radiators 41a and 41b) are prevented from flowing into the cooler 14 side.

  In the refrigerator of the present embodiment, the fan 9 is turned on, the refrigerator compartment damper 20 is opened, the refrigerator compartment damper 60 is closed, and cold air is generated by the frost grown on the cooler 14 to cool the refrigerator compartment 2 ( The section from time t1 to t2 in FIG. 9, the section from time t7 to t8). Here, if the three-way valve 130 and the two-way valve 131 are closed while the compressor 24 is stopped, the rate of the temperature rise of the cooler 14 and frost is suppressed. Thus, by closing the three-way valve 130 and the two-way valve 131 while the compressor 24 is stopped, the compressor 24 is turned off, the fan 9 is turned on, the refrigerator compartment damper 20 is opened, and the freezer compartment damper 60 is closed. As described above, the efficiency of the refrigerating room cooling operation using the frost of the cooler 14 as a cold heat source can be increased, which contributes to the reduction of power consumption.

  When the compressor 24 is in operation, as shown in FIG. 8, the dew condensation prevention pipe 72 (cycle A) and the bypass pipe 74 (cycle B) according to the temperature and humidity detected by the temperature sensor 52 and the humidity sensor 120. Control the switching time. For example, when the humidity is RH1, the time tA1 of the dew condensation prevention pipe 72 (cycle A) is about 10 minutes and the time tB1 of the bypass pipe 74 (cycle B) is about 40 minutes, and these are operated repeatedly.

  In FIG. 9 shown as an example of the cooling operation, the three-way valve 130 is fixed to the dew condensation prevention pipe 72 (cycle A) before the compressor 24 stops. At this time, the two-way valve 131 is closed. Since there is no means for heating the partition covers 36a, 36b, 36c when the compressor 24 is stopped, the surface temperature of the partition covers 36a, 36b, 36c is reduced before the compressor 24 is stopped by flowing a refrigerant through the dew condensation prevention pipe 72. It is designed to prevent condensation.

  Next, heating control of the vegetable compartment 6 by the vegetable compartment heating pipe 73 will be described. Cooling of the vegetable compartment 6 supplies the cold air by opening the vegetable compartment damper 13 when the vegetable compartment temperature detected by the vegetable compartment temperature sensor 32 reaches the TV 1 (time t1). While the compressor 24 is stopped, the vegetable compartment 6 is cooled using the cold air generated by the frost grown on the cooler 14. Thereafter, the compressor 24 is operated (time t2), and when the temperature of the vegetable compartment 6 does not reach the TV 2, the vegetable compartment damper 13 is opened and the cool air is continuously supplied, and the temperature of the vegetable compartment 6 reaches the TV 2. When reaching (time t3), the vegetable compartment damper 13 is closed.

  In the vegetable compartment 6, the flow rate of the cold air is adjusted by the vegetable compartment damper 13, but the temperature of the vegetable compartment 6 tends to decrease through the lower heat insulating partition wall 29 particularly during the freezing operation. If the temperature of the vegetable compartment 6 is lowered, the stored vegetables may be frozen, so the vegetable compartment 6 needs to be kept at a predetermined temperature or higher. When the freezing prevention temperature of the vegetable compartment 6 reaches TV3 (time t5), the two-way valve 131 is controlled so that the refrigerant flows through the vegetable compartment heating pipe 73. As shown in FIG. 6, the vegetable compartment 6 is heated until the vegetable compartment temperature reaches the TV 4 (time t <b> 6) by flowing the refrigerant through the vegetable compartment heating pipe 73 disposed in the lower heat insulating partition wall 29. During the period from time t5 to t6, the refrigerant flows through the vegetable room heating pipe 73. During this time, there is a time zone during which the refrigerant flows through the condensation prevention pipe 72 as well. In this case, the three-way valve 130 switches to the first refrigerant flow path (cycle A) that flows through the dew condensation prevention pipe 72, and the second refrigerant flow path (cycle C) that flows through the vegetable room heating pipe 73 with the two-way valve 131 opened. At the same time, the refrigerant is supplied. When there is no need to flow the refrigerant through the vegetable room heating pipe 73, the first refrigerant flow path (cycle A) flowing through the dew condensation prevention pipe 72 and the third refrigerant flow path (cycle B) flowing through the bypass pipe 74 are three-way valves. Although switching is performed at 130, when it is necessary to cause the refrigerant to flow through the vegetable room heating pipe 73 at the same time, the refrigerant does not flow through the third refrigerant flow path (cycle B) flowing through the bypass pipe 74.

  Moreover, when the ambient temperature of the refrigerator 1 is low, for example, in a refrigerator having an ambient temperature of about 15 ° C., the time period during which the compressor 24 is stopped becomes long. The vegetable room heating pipe 73 cannot be used for heating. In such a case, the vegetable room heater 26 provided in the lower heat insulating partition wall 29 is used to heat to the temperature TV4. During the period from time t5 to t6, the refrigerant is passed through the vegetable room heating pipe 73 to heat the vegetable room 6 and raise the temperature to the predetermined TV 4, but when the temperature rise of the vegetable room 6 within a predetermined time is small The heating time may be shortened in combination with the vegetable room heater 26.

  Next, FIG. 10a is an explanatory diagram of the refrigeration cycle according to the first embodiment of the present invention, and is a diagram for explaining the state of the refrigerant when the refrigerant is caused to flow simultaneously through a plurality of heating means. FIG. 10 b is a Mollier diagram showing the operating state of the refrigeration cycle according to Example 1 of the present invention.

  Symbols a, b, c, d, f, g1, g2, and h in FIG. 10b correspond to intermediate positions of the refrigerant pipes that constitute the refrigeration cycle shown in FIG. 10a (refer to FIG. 3 together). The refrigerant flowing into the first radiator 46 exchanges heat with the outside air blown by the machine room fan 45, and the state changes from the gas phase region (a to b) to the gas-liquid two phase region (b to c). . Thereafter, the refrigerant flows through the second radiators 41a and 41b disposed in the both side walls of the refrigerator 1 (within the heat insulating space between the outer box 10a and the inner box 10b), and the state d is changed from the state c in the gas-liquid two-phase region. To the inlets of the three-way valve 130 and the two-way valve 131. During this time, as the liquid phase region gradually increases, the dryness is reduced.

  The three-way valve 130 is switched to the dew condensation prevention pipe 72 (cycle A), the two way valve 131 is opened, and the refrigerant flows through the dew condensation prevention pipe 72 and the vegetable compartment heating pipe 73 simultaneously, so that the surfaces of the partition covers 36a, 36b, 36c Heating and heating of the lower heat insulating partition wall 29 are performed (for example, assuming that the refrigerant flows through the dew condensation prevention pipe 72 between times t5 and t6 shown in FIG. 9). Since the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 are arranged in parallel, the state of the refrigerant at the inlet of the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 is substantially the same. The refrigerant flowing through the dew condensation prevention pipe 72 changes from the state d of the inlet portion to the state f, and changes from the state f in the middle of the condensation prevention pipe 72 to the state g1 of the outlet portion. Since the state d to f is a gas-liquid two-phase region, the temperature is constant. However, since the state f to g1 is a liquid phase region, the surface temperatures of the partition covers 36a, 36b, and 36c gradually decrease. On the other hand, the refrigerant flowing through the vegetable room heating pipe 73 changes from the state d of the inlet part to the state f, and changes from the state f in the middle of the vegetable room heating pipe 73 to the state g2 of the outlet part.

  Since the refrigerant flow rate flowing through the dew condensation prevention pipe 72 and the refrigerant flow rate flowing through the vegetable compartment heating pipe 73 are different, the respective heating amounts are different. Therefore, the length of the gas-liquid two-phase region maintained at a constant temperature by the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 is different from the length of the liquid phase region accompanied by a temperature drop. However, since the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 are arranged in parallel, the lengths of the gas-liquid two-phase areas in the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 when the refrigerant flows at the same time, respectively. It can be secured above a certain level, and is unlikely to be underheated. Accordingly, the surface heating of the partition covers 36a, 36b and 36c and the heating of the lower heat insulating partition wall 29 can be used as the heating means of the refrigerant pipe of the refrigeration cycle, and a cooling operation with high energy saving performance can be realized.

  When the length of the liquid phase region of the refrigerant in the pipe increases, the temperature decreases, so that the temperature in the downstream portion of the dew condensation prevention pipe 72 is particularly likely to decrease. In such a case, the partition cover 36a or the partition cover 36b (FIG. 2), which is a partition located at the downstream portion of the dew condensation prevention pipe 72 by increasing the ratio (tA) of flowing the refrigerant through the dew condensation prevention pipe 72 shown in FIG. 4), the energy saving effect is reduced. In FIG. 10a, the refrigerant in the state g1 at the outlet of the dew condensation prevention pipe 72 and the refrigerant in the state g2 at the outlet of the vegetable room heating pipe 73 merge at the junction 76 and pass through the first dryer 77a. The refrigerant is in the state h at the inlet of one expansion device 81. The enthalpy of the refrigerant in the state h after the merging is a value corresponding to the ratio of the refrigerant flow rates of the enthalpy at the outlet of the dew condensation prevention pipe 72 and the enthalpy at the outlet of the vegetable room heating pipe 73.

  As shown in FIG. 3, when flowing a refrigerant through the dew condensation prevention pipe 72, when flowing a refrigerant through the vegetable room heating pipe 73, and when flowing a refrigerant through the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 at the same time, respectively. The refrigerant flows through one throttle device 81. The second expansion device 82 connected to the bypass pipe 74 through which the refrigerant that bypasses the dew condensation prevention pipe 72 flows performs a cooling operation that emphasizes energy saving performance by making the expansion amount larger than that of the first expansion device 81. ing.

  FIG. 11 is a diagram showing a refrigeration cycle of a comparative example, in which heating means are arranged in series. An example in which a vegetable room heating pipe 72 and a dew condensation prevention pipe 73 are arranged in series for the purpose of heating is shown. In the present embodiment, the vegetable room heating pipe 72 and the dew condensation prevention pipe 73 are arranged in parallel (see FIG. 3), and both refrigeration cycles are compared.

  In FIG. 11, the refrigerant flow path to the three-way valve 86 connected to the refrigerant pipe 68 is the same as that shown in FIG. In the comparative example of FIG. 11, the refrigerant pipe 88 and the bypass pipe 89 are branched downstream of the three-way valve 86, and the vegetable compartment heating pipe 72 is provided in the middle of the refrigerant pipe 88. The bypass pipe 89 joins the refrigerant pipe 88 again at the junction 132, and then the downstream side of the refrigerant pipe 88 is connected to the three-way valve 87. The outlet side of the three-way valve 87 branches into a refrigerant pipe 90 and a bypass pipe 91, and a dew condensation prevention pipe 73 is provided in the middle of the refrigerant pipe 90. A dryer 77c, a refrigerant pipe 92, and a throttle device 94 are sequentially connected to the downstream side of the refrigerant pipe 90. A dryer 77c separate from the dryer 77c is provided in the middle of the bypass pipe 91. A refrigerant pipe 93, a throttle device 94, and a separate throttle device 95 are connected in order to the outlet side of the dryer 77d. The downstream side of the expansion device 95 is joined at a junction 83. The configuration of the refrigerant pipe that returns to the compressor 24 on the downstream side of the junction 83 is the same as that shown in FIG.

  FIG. 12a is a diagram illustrating the state of the refrigerant in the refrigeration cycle of the comparative example of FIG. 12b is a Mollier diagram showing the operating state of the refrigeration cycle of the comparative example of FIG.

  Symbols a, b, c, d, e, f, and g in the figure respectively correspond to the positions of the refrigerant flow paths constituting the refrigeration cycle of the refrigerator shown in FIG. The state up to the state d after the refrigerant has passed through the second radiators 41a and 41b arranged in the both side wall surfaces of the refrigerator 1 is the same as that in FIG.

  In the comparative example, a case is considered in which the three-way valve 86 is switched to the refrigerant pipe 88 side, the three-way valve 87 is switched to the refrigerant pipe 90 side, and the refrigerant flows through the vegetable room heating pipe 72 and the dew condensation prevention pipe 73 arranged in series. Assuming that the refrigerant at the inlet of the vegetable compartment heating pipe 72 is in state d, the outlet of the vegetable compartment heating pipe 72 becomes dry and becomes state e as the lower heat insulating partition wall 29 is heated. Thereafter, the refrigerant flows into the dew condensation prevention pipe 73, heats the surfaces of the partition covers 36a, 36b, 36c, and reaches the liquid phase state f from the middle of the dew condensation prevention pipe 73 with a decrease in temperature. At the outlet of the dew condensation prevention pipe 73, the state is g.

  As described above, when the vegetable compartment heating pipe 72 and the dew condensation prevention pipe 73 are arranged in series and the refrigerant is flowed, the ratio of the liquid phase region in the dew condensation prevention pipe 73 provided on the downstream side of the vegetable compartment heating pipe 72 in particular is increased. Therefore, the temperature decreases significantly in the flow direction of the dew condensation prevention pipe 73, and the partition covers 36a, 36b, 36c cannot be raised to a temperature necessary for preventing dew condensation. If the partition covers 36a, 36b, and 36c are not sufficiently heated by the dew condensation prevention viper 73, the rotation speed of the compressor 24 can be increased to increase the temperature of the refrigerant flowing through the dew condensation prevention pipe 73, but the power consumption can be increased. Will be invited.

  Therefore, as in the configuration of the refrigeration cycle according to the present embodiment shown in FIG. 3, the dew condensation prevention pipe 72 and the vegetable room heating pipe are provided downstream of the refrigerant flow switching means (three-way valve 130, two-way valve 131). By arranging 73 in parallel, even if the refrigerant flows through the condensation prevention pipe 72 and the vegetable room heating pipe 73 at the same time, it becomes difficult for the condensation prevention pipe 72 and the vegetable room heating pipe 73 to be underheated. (Partitions) 36a, 36b, 36c surface heating, and heating of the vegetable compartment 6 side of the lower heat insulation partition wall (heat insulation partition part that partitions the storage room of the refrigeration temperature zone and the storage room of the freezing temperature zone) 29 of the refrigeration cycle The refrigerant pipe can function as a heating means, and a cooling operation with high energy saving performance can be realized.

  FIG. 13 is a configuration diagram of the refrigeration cycle of the refrigerator according to the second embodiment of the present invention. In addition, about the structure similar to Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. It is the same structure as Example 1 in the point which has arrange | positioned the dew condensation prevention pipe 72 and the vegetable compartment heating pipe 73 in parallel. In the second embodiment, a four-way valve 69 is used as a refrigerant flow path switching unit that switches between the dew condensation prevention pipe 72 and the bypass pipe 74. As shown in FIG. 14, the refrigerant flowing from the refrigerant pipe 68 connected to the inlet side of the four-way valve 69 is supplied to the refrigerant pipe provided on the outlet side of the four-way valve 69 by the rotation of the valve body 140 inside the four-way valve 69. 70 (cycle A which is the first refrigerant flow path), refrigerant pipe 74 (cycle B which is the third refrigerant flow path), and refrigerant pipe 71 (cycle C which is the second refrigerant flow path). Can flow the refrigerant.

  A condensation pipe 72 is connected to the refrigerant pipe 70 (cycle A) on the outlet side of the four-way valve 69. The refrigerant pipe 100 is connected to the outlet side of the condensation prevention pipe 72, and the downstream side of the refrigerant pipe 100. Is provided with a first dryer 77a. A check valve 75 is provided in the middle of the pipe 100 connecting the first dryer 77 a and the dew condensation prevention pipe 72. A refrigerant pipe 78 is connected to the outlet side of the first dryer 77 a, and a first expansion device 81 is connected to the downstream side of the refrigerant pipe 78.

  A vegetable room heating pipe 73 is connected to the refrigerant pipe 71 (cycle C) on the outlet side of the four-way valve 69. A refrigerant pipe 101 is connected to the outlet side of the vegetable chamber heating pipe 73, and the downstream side of the refrigerant pipe 101 merges with the refrigerant pipe 100 at the junction 76. The check valve 75 is disposed between the junction 76 and the condensation prevention pipe 72, and the check valve 75 is also provided between the refrigerant pipe 101 and the junction 76.

  The bypass pipe 74 (cycle B) on the outlet side of the four-way valve 69 is a refrigerant flow path when neither the dew condensation prevention pipe 72 nor the vegetable compartment heating pipe 73 allows the refrigerant to flow. A second dryer 77b is provided on the downstream side of the bypass pipe 74, and a refrigerant pipe 79 is connected to the outlet side of the second dryer 77b. A second expansion device 82 is connected to the downstream side of the refrigerant pipe 79. The outlet side of the first throttle device 81 and the second throttle device 82 merges at a junction 83, a refrigerant pipe 84 is connected to the downstream side of the junction 83, and the downstream side of the refrigerant pipe 84 is further downstream. It is connected to the evaporator 14. The refrigerant pipe 85 connected to the outlet side of the evaporator 14 is provided with a heat exchanging unit 80 so as to exchange heat with a part of the first throttle device 81 and the second throttle device throttle 82 in the middle. A refrigerant pipe 85 on the downstream side of the heat exchange unit 80 is connected to the suction side of the compressor 24.

  Control using the four-way valve 69 of the second embodiment is performed in the same manner as in the example of the cooling operation shown in FIG. 9 of the first embodiment. In other words, the refrigerant circuit is switched by the three-way valve 130 and the two-way valve 131 of the first embodiment with the four-way valve 69 in the second embodiment.

  In the case of flowing the refrigerant through the vegetable compartment heating pipe 73, in the second embodiment, the four-way valve 69 is switched so as to be connected to the refrigerant pipe 71 on the outlet side. In the second embodiment, the four-way valve 69 is fully closed to correspond to the refrigerant flow path configuration in which the three-way valve 130 and the two-way valve 131 in the first embodiment are closed. When the refrigerant flows through both the condensation prevention pipe 72 and the vegetable compartment heating pipe 73, the four-way valve 69 is switched so that the refrigerant flows through both the refrigerant pipe 70 and the refrigerant pipe 71 on the outlet side of the four-way valve 69.

  As described above, by using the four-way valve 69 as the refrigerant flow path switching means for switching the dew condensation prevention pipe 72, the vegetable room heating pipe 73, and the bypass pipe 74, the surface heating of the partition covers 36a, 36b, 36c, and the lower heat insulating partition The heating of the wall 29 on the vegetable compartment 6 side can function as a heat radiating means using the refrigerant pipe of the refrigeration cycle, and similarly, a cooling operation with high energy saving performance can be realized. Further, the switching of the refrigerant flow path by the three-way valve 130 and the two-way valve 131 shown in FIG. 3 of the first embodiment can be performed collectively in the single four-way valve 69 in the second embodiment. The installation space for the refrigerant flow path switching means installed in 61 can be reduced. Accordingly, since there is room in the machine room 61, it is possible to contribute to the improvement of the heat radiation performance of the compressor 24 and the first radiator 46 disposed in the machine room 61, and further energy saving performance is achieved. High operation can be carried out. Furthermore, since the refrigerant flow path switching control can be performed with the single four-way valve 69, the control is simplified.

  FIG. 14 is a diagram schematically showing a refrigerant flow path switching pattern by the refrigerant flow path switching means (four-way valve). The inside of the four-way valve 69 is seen from above so that the operation of the valve body 140 can be understood. The drive part which rotates the valve body 140 is abbreviate | omitted. The base portion of the four-way valve 69 is provided with one inlet portion 141 and three outlet portions, that is, an outlet portion (A) 142, an outlet portion (B) 143, and an outlet portion (C) 144. The inlet portion 141 Is the refrigerant pipe 68, the outlet part (A) 142 is connected to the example pipe 70, the outlet part (B) 143 is connected to the refrigerant pipe 74, and the outlet part (C) 144 is connected to the refrigerant pipe 71. The four-way valve 69 can select a portion to be communicated and a portion to be closed inside the four-way valve 69 by the rotation of the valve body 140.

  There are five ways of switching the refrigerant flow path by the four-way valve 69 as follows. When the four-way valve 69 is fully closed, the outlet part (A) 142, the outlet part (B) 143, and the outlet part (C) 144 are all positioned so as to be closed by the valve body 140. The refrigerant that has flowed into the four-way valve 69 does not flow out from any outlet side.

  When the refrigerant flows through the dew condensation prevention pipe 72 (cycle A which is the first refrigerant flow path), in order to flow the refrigerant through the pipe 70 connected to the dew condensation prevention pipe 72, the inlet part 141 and the outlet part (A) 142 are provided. Is positioned by rotating the valve body 140 such that the valve body 140 communicates with the inside of the four-way valve 69.

  In the case where the refrigerant flows simultaneously through the dew condensation prevention pipe 72 (cycle A which is the first refrigerant flow path) and the vegetable room heating pipe 73 (cycle C which is the second refrigerant flow path), the inlet portion 141 and the outlet portion (A) 142 and the outlet portion (C) 143 are rotated and positioned so that the four-way valve 69 communicates with the valve body 140.

  When flowing the refrigerant through the vegetable compartment heating pipe 73 (cycle C which is the second refrigerant flow path), in order to flow the refrigerant through the refrigerant pipe 71 connected to the vegetable compartment heating pipe 73, an inlet portion 141 and an outlet portion ( C) The valve body 140 is rotated and positioned so that 143 communicates within the four-way valve 69.

  When flowing the refrigerant through the bypass pipe 74 (cycle B which is the third refrigerant flow path), in order to flow the refrigerant through the refrigerant pipe 74 connected to the bypass pipe 73, the inlet portion 141 and the outlet portion (B) 144 are provided. The valve body 140 is rotated and positioned so as to communicate with the inside of the four-way valve 69.

  FIG. 15 is a configuration diagram of the refrigeration cycle of the refrigerator according to the third embodiment of the present invention. About the structure similar to Example 1 and Example 2, the same code | symbol is attached | subjected and description is abbreviate | omitted. By the four-way valve 69, the dew condensation prevention pipe 72 (cycle A which is the first refrigerant flow path), the bypass pipe 74 (cycle B which is the third refrigerant flow path), and the vegetable room heating pipe (second refrigerant flow path) The configuration in which the cycles C) are arranged in parallel is the same as in FIGS. In the third embodiment, the refrigerant pipe 100 connected to the outlet side of the dew condensation prevention pipe 72 joins the bypass pipe 74 at the junction 98, and the refrigerant pipe 101 connected to the outlet side of the vegetable room heating pipe 73 joins the junction. At 99, join. The junction 99 is provided on the downstream side of the refrigerant pipe 100 with respect to the junction 98. A third radiator 105 is provided in the refrigerant pipe 100 on the downstream side of the junction 99. For example, as shown in FIG. 4, the third radiator 105 may be provided in a heat insulating wall on the back side of the refrigerator 1, that is, in a heat insulating space between the outer box 10 a and the inner box 10 b. A refrigerant pipe 102 is connected to the outlet side of the third radiator 105, a dryer 77e is provided in the middle of the refrigerant pipe 102, and a throttle device 96 is connected to the outlet side of the dryer 77e. The control using the four-way valve 69 in Example 3 is performed in the same manner as in the example of the cooling operation shown in FIG. 9, but the dew condensation prevention pipe 72 (cycle A) and the vegetable room heating pipe 73 (cycle C) are arranged in parallel. By doing so, the state of the gas-liquid two-phase region in the dew condensation prevention pipe 72 (cycle A) and the vegetable room heating pipe 73 (cycle C) is configured to be long. As a result, the range of the refrigerant pipe that can heat the partition covers 36a, 36b, 36c and the lower heat insulating partition wall 29 at a constant temperature (the range of the state of the gas-liquid two-phase region) is expanded, and the single four-way valve 69 It becomes easy to perform switching control of the refrigerant flow path. In addition, when the four-way valve 69 is switched so that the refrigerant flows through the bypass pipe 74, when the heat dissipation performance is insufficient, another heat radiator may be separately provided in the middle of the bypass pipe 74.

  As described above, the surface heating of the partition covers 36a, 36b, and 36c and the heating of the lower heat insulating partition wall 29 on the vegetable compartment 6 side can function as the refrigerant pipe of the refrigeration cycle as a heating means, and cooling with high energy saving performance Driving can be realized.

  FIG. 16 is an explanatory diagram of the refrigeration cycle according to the third embodiment of the present invention, and is a diagram illustrating the state of the refrigerant when the refrigerant is caused to flow simultaneously through a plurality of heating means. Symbols a, b, c, g1, g2, and h in the figure respectively correspond to the positions of the refrigerant flow paths that constitute the refrigeration cycle shown in FIG. The state up to the state d after the refrigerant has passed through the second radiators 41a and 41b arranged in the both side wall surfaces of the refrigerator 1 is the same as FIG. 3 of the first embodiment and FIG. 13 of the second embodiment. In the third embodiment, a dew condensation prevention pipe 72 and a vegetable room heating pipe 73 branched by a four-way valve 69 are provided between the second radiators 41a and 41b and the third radiator 105, and the refrigerant is allowed to flow through each of them simultaneously. Even in the dew condensation prevention pipe 72, since the refrigerant is in the gas-liquid two-phase region from the state d to the state g1 of the outlet portion and in the vegetable room heating pipe 73 from the state d to the state g2 of the outlet portion, the partition cover 36a. , 36b, 36c and the lower heat insulating partition wall 29 are easily heated at a constant temperature, and are not easily heated.

  Since the refrigerant after having joined at the junction 99 of the condensation prevention pipe 72 (cycle A) and the vegetable room heating pipe 73 (cycle C) is configured to flow into the third radiator 105, the third The ratio of the liquid phase region at the inlet portion of the expansion device 96 located on the outlet side of the radiator 105 can be increased. Since the third radiator 105 is intended to dissipate heat around the refrigerator 1, there is no problem even if a large amount of liquid phase area occupies the third radiator 105 and causes a temperature drop.

  FIG. 17 is a configuration diagram of the refrigeration cycle of the refrigerator according to the fourth embodiment of the present invention. The same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted. Symbols a, b, c, g1, g2, and h in the figure respectively correspond to the positions of the refrigerant flow paths of the refrigeration cycle shown in FIG. FIG. 3 of Example 1, FIG. 13 of Example 2, FIG. 15 of Example 3 and FIG. 15 of Example 3 until state d after the refrigerant has passed through the second radiators 41a and 41b arranged in the both side walls of the refrigerator 1 It is common. In Example 4, a flow rate adjusting unit 97 is provided in the middle of the refrigerant pipe 71 connected to the vegetable compartment heating pipe 73, and the outlet side of the vegetable compartment heating pipe 73 is connected to the refrigerant pipe 103. The downstream side of the refrigerant pipe 103 is connected to the junction 104 in the middle of the dew condensation prevention pipe 72 branched by the four-way valve 69. A check valve 75 is provided in the middle of the refrigerant pipe 103 on the outlet side of the vegetable room heating pipe 73. The reason why the outlet side of the vegetable room heating pipe 73 is connected in the middle of the dew condensation prevention pipe 72 will be described with reference to FIG.

  FIG. 18 is an explanatory diagram of the refrigeration cycle according to the fourth embodiment of the present invention, and is a diagram illustrating the state of the refrigerant when the refrigerant is caused to flow simultaneously through a plurality of heating means. The partition covers 36 a, 36 b, 36 c and the lower heat insulating partition wall 29 are heated by the refrigerant flowing through the dew condensation prevention pipe 72 and the vegetable room heating pipe 73, respectively. Are not necessarily the same. In the fourth embodiment shown in FIG. 17, when the refrigerant flows simultaneously through the dew condensation prevention pipe 72 and the vegetable room heating pipe 73 by the four-way valve 69, the temperature at the outlet of the vegetable room heating pipe 73 and the junction 104 of the dew condensation prevention pipe 72. The refrigerant flow rate is adjusted by a flow rate adjusting unit 97 provided on the inlet side of the vegetable room heating pipe 73 so that the temperature of the vegetable room heating pipe 73 becomes equal. Since the throttle amount changes depending on the refrigerant state h on the inlet side of the first throttle device 81, the refrigerant flow rate is adjusted by the flow rate adjusting unit 97 and then joined to the dew condensation prevention pipe 72 to obtain a more stable pressure reduction amount. ing. In the case of the present embodiment, although not shown, a temperature sensor for measuring the temperature of the outlet portion of the vegetable room heating pipe 73 and the junction portion 104 of the dew condensation prevention pipe 72 is provided. The temperature of the merging portion 104 of the dew condensation prevention pipe 72 may also serve as a temperature sensor necessary for switching control of the dew condensation prevention pipe 72 shown in FIG. Moreover, although the flow volume adjustment part 97 is provided in the entrance side of the vegetable room heating pipe 73, the position of the valve body 140 in the four-way valve 69 is adjusted, and the outlet part (A) 142 or the outlet part (C) 143 is adjusted. The refrigerant flow rate of the condensation prevention pipe 72 or the vegetable room heating pipe 73 can also be adjusted by adjusting the opening area (see FIG. 14).

  As described above, the surface heating of the partition covers 36a, 36b, and 36c and the heating of the lower heat insulating partition wall 29 can be functioned as the refrigerant pipe of the refrigeration cycle as a heating means. Since the state of the refrigerant can also be controlled, a cooling operation with high energy saving performance can be realized.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1 Refrigerator 2 Refrigerated room (storage room in refrigerated temperature zone)
3 Ice making room 4 Upper freezer room 5 Lower freezer room 6 Vegetable room 7 Freezer room (freezing temperature storage room)
8 Cooler storage chamber 9 Fan 10 Heat insulation box 10a Outer box 10b Inner box 14 Cooler 16 Vegetable room back side wall surface 17 Freezer room cold air return part 18 Vegetable room cold air return duct 18a Vegetable room side cold air return part 18b Vegetable room cold air Return part 19 Heater 20 Cold room damper 20a Baffle 22 Defrost heater 23 樋 24 Compressor 25 Vacuum heat insulating material 26 Vegetable room heater 27 Drain hole 28 Upper heat insulation partition part 29 Lower heat insulation partition part 30 Substrate cover 31 Connection part 32 Vegetable room temperature Sensor 36a, 36b, 36c Partition cover (partition part)
40 Heat insulation partitioning parts 41a and 41b Second radiator 45 Machine room fan 46 First radiator 47 Vegetable room damper 51 Control board 52 Temperature sensor 60 Freezer room damper 60a Baffle 61 Machine rooms 66, 67, 68 Refrigerant pipe 69 Four-way Valve (refrigerant flow path switching means)
70, 71 Refrigerant pipe 72 Condensation prevention pipe (first heat radiation means)
73 Vegetable room heating pipe (second heat dissipation means)
74 Bypass pipe 75 Check valve 76 Junction part 77a First dryer 77b Second dryers 77c, 77d, 77e Dryers 78, 79 Refrigerant pipe 80 Heat exchange part 81 First throttle device (pressure reduction means)
82 Second throttle device (pressure reduction means)
83 Junction section 84, 85 Refrigerant pipe 96 Throttle device (pressure reduction means)
97 Flow rate adjusting unit 98, 99 Junction unit 100, 101, 102 Refrigerant pipe 104 Junction unit 105 Third radiator 110, 111 Heat flow 120 Outside humidity sensor 121 Cold room temperature sensor 122 Freezer room temperature sensor 130 Three-way valve ( Refrigerant flow path switching means)
131 Two-way valve (refrigerant flow path switching means)
132 Junction part 140 Valve body 141 Inlet part 142 Outlet part (A)
143 Exit (C)
144 Exit (B)
145 Valve base

Claims (5)

A storage room in a freezing temperature zone;
A refrigerated storage room,
A heat insulating partition that partitions the storage compartment of the refrigeration temperature zone and the storage compartment of the refrigeration temperature zone;
A compressor, a heat dissipation means, a decompression means, and a refrigeration cycle connected to a cooler,
The heat dissipating means includes a first heating means for heating a partition in front of the storage room in the freezing temperature zone, and a second heating means for heating the storage room in the refrigeration temperature zone provided in the heat insulating partition. And comprising
The first refrigerant flow path including the first heating means and the second refrigerant flow path including the second heating means are arranged in parallel,
Refrigerant flow path switching means for switching between the first refrigerant flow path and the second refrigerant flow path,
Said first heating means and the second heating means has a merging portion that merges with the downstream side, provided with a portion of the radiator for radiating to the surrounding refrigerator on the downstream side of the confluence portion Features a refrigerator. The heat insulating partition includes a heating source independent of the refrigeration cycle,
The refrigerator according to claim 1, wherein the storage room in the refrigeration temperature zone is heated by at least one of the second heating means and the heating source.   A third refrigerant flow path bypassing the first refrigerant flow path, wherein the first refrigerant flow path, the second refrigerant flow path, and the third refrigerant flow path are refrigerant flow path switching means; The refrigerator according to claim 1, wherein the flow path is switched by a four-way valve. A storage room in a freezing temperature zone;
A refrigerated storage room,
A heat insulating partition that partitions the storage compartment of the refrigeration temperature zone and the storage compartment of the refrigeration temperature zone;
A compressor, a heat dissipation means, a decompression means, and a refrigeration cycle connected to a cooler,
The heat dissipating means includes a first heating means for heating a partition in front of the storage room in the freezing temperature zone, and a second heating means for heating the storage room in the refrigeration temperature zone provided in the heat insulating partition. And comprising
The first refrigerant flow path including the first heating means and the second refrigerant flow path including the second heating means are arranged in parallel,
Refrigerant flow path switching means for switching between the first refrigerant flow path and the second refrigerant flow path is provided, and the downstream side of the second heating means is connected in the middle of the first heating means. Refrigerator.   The refrigerator according to claim 4, further comprising a refrigerant adjusting unit that adjusts a refrigerant flow rate upstream of the second heating unit and downstream of the refrigerant flow switching unit.