JP6883531B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2003-130535) states that "the inside of a heat insulating box body in which a heat insulating material is filled between an outer box and an inner box is divided into at least a freezing room and a refrigerating room including a vegetable room. A first cooler corresponding to the freezer and a first blower for forced circulation of cold air are provided at the rear of the freezer, and a cold air generation chamber partitioned by a partition is provided, while the refrigerator or vegetable compartment is provided. A second cooler corresponding to the refrigerator compartment and the vegetable compartment and a second blower for forced circulation of cold air are provided at the rear portion, and a cold air generation chamber partitioned by a partition is provided. (2) In a refrigerator provided with a water tray for receiving defrosted water and a drainage channel provided between the drain port of the water tray and the evaporation plate in the machine room provided at the lower rear part of the heat insulating box. A refrigerator having a structure in which a heater for preventing freezing of defrosted water is provided inside the water tray and "power is supplied to the heater for a predetermined time after the defrosting operation of the second cooler is completed". It is described (see Patent Document 1 [0007] [0008]).

Japanese Unexamined Patent Publication No. 2003-130535

The refrigerator of Patent Document 1 is provided with a heater inside a water tray that receives the defrosted water of the second cooler, and after the defrosting operation of the second cooler is completed, power is supplied to the heater for a predetermined time to defrost. Prevents water from freezing.

However, in the refrigerator of Patent Document 1, since the water tray is arranged on the partition member between the refrigerating chamber and the freezing chamber (see FIG. 1 of Patent Document 1 and the like), the water tray is cooled by the freezing chamber. Therefore, when the heater is energized after the defrosting operation of the second cooler is completed, the heater is cooled by the freezing chamber, which causes a problem that the amount of heat of the heater increases.

Therefore, according to the present invention, in a refrigerator in which a space in the freezing temperature range such as a freezing room is arranged below the evaporator room for refrigeration (cold air generation room), a refrigerator having high energy-saving performance while reliably discharging defrosted water is provided. The purpose is to provide.

The present invention made in view of the above problems includes a refrigerating chamber, a refrigerating evaporator that cools the refrigerating chamber, a refrigerating fan that blows air cooled by the refrigerating evaporator to the refrigerating chamber, and the refrigerating chamber. Refrigerator chamber provided with a refrigerator and a refrigerating fan, a refrigerating chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber, a freezing chamber, and refrigerating evaporation for cooling the refrigerating chamber. A refrigerator, a refrigerating fan that blows air cooled by the refrigerating evaporator to a freezing chamber, a refrigerating evaporator chamber provided with the refrigerating evaporator and the refrigerating fan, the refrigerating evaporator chamber, and the above. The refrigerator is provided with a freezer chamber air passage connecting the freezer compartments, a first heater for heating the refrigerating evaporator, a compressor, a radiator, a depressurizing means, and a refrigerant flow path controlling means. A refrigerating defrosting operation that heats the frost adhering to the evaporator with air to defrost it, and a refrigerating defrosting operation that heats the frost adhering to the refrigerating evaporator to defrost it. In a refrigerator having the refrigerating evaporator chamber or the refrigerating chamber arranged below the refrigerating evaporator chamber, the defrost water generated from the refrigerating evaporator is discharged to the outside of the refrigerator. A refrigerator provided with two heaters, wherein the second heater is energized during the refrigerating defrosting operation.

According to the present invention, in a refrigerator in which a space in a freezing temperature zone such as a freezing chamber is arranged below the evaporator chamber for refrigeration, it is possible to provide a refrigerator having high energy-saving performance while reliably discharging defrosted water. it can.

Front view of the refrigerator according to the first embodiment AA sectional view of FIG. BB sectional view of FIG. The figure which shows the structure of the drainage pipe for refrigeration The circuit diagram which shows the electric heater wiring in the refrigerator of Example 1. Schematic diagram showing a refrigeration cycle configuration in the refrigerator of Example 1. An example of a time chart showing cooling operation control in the refrigerator of Example 1. An example of a time chart showing RF defrosting operation control in the refrigerator of Example 1. Heating control of each heater during the RF defrosting operation of Example 1. Cross-sectional view showing the arrangement relationship between the outer box and the inner box and the R drain pipe

The following is an embodiment of the present invention.

<Example 1>
Example 1 of the refrigerator according to the present invention will be described. 1 is a front view of the refrigerator according to the first embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. The box body 10 of the refrigerator 1 has a refrigerating chamber 2 from above, an ice making chamber 3 attached to the left and right, an upper freezing chamber 4, a lower freezing chamber 5, and a vegetable compartment 6 in this order. Refrigerator 1 is provided with a door that opens and closes the opening of each storage room. These doors open and close the opening of the refrigerating room 2, the rotating refrigerating room doors 2a and 2b divided into left and right, and the openings of the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6. A pull-out type ice making chamber door 3a, an upper freezing chamber door 4a, a lower freezing chamber door 5a, and a vegetable compartment door 6a that open and close, respectively. Hereinafter, the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 are collectively referred to as a freezing chamber 7.

The freezing chamber 7 is basically a storage chamber in which the inside of the refrigerator is set to a freezing temperature zone (less than 0 ° C.), for example, about -18 ° C on average, and the refrigerating chamber 2 and the vegetable compartment have a refrigerating temperature zone (0 ° C.) For example, the refrigerating room 2 is a storage room having an average temperature of about 4 ° C., and the vegetable room is a storage room having an average temperature of about 7 ° C.

The door 2a is provided with an operation unit 26 for operating the temperature setting in the refrigerator. Door hinges (not shown) are provided at the upper and lower parts of the refrigerator compartment 2 to fix the refrigerator 1 and the doors 2a and 2b, and the upper door hinges are covered with the door hinge cover 16.

As shown in FIG. 2, the outside and inside of the refrigerator 1 are separated by a box body 10 formed by filling an outer box 10a and an inner box 10b with a foam insulating material (for example, urethane foam). There is. In addition to the foam heat insulating material, a plurality of vacuum heat insulating materials 25 are mounted on the box body 10 between the outer box 10a made of steel plate and the inner box 10b made of synthetic resin. The refrigerating room 2, the upper freezing room 4, and the ice making room 3 are separated by a heat insulating partition wall 28, and similarly, the lower freezing room 5 and the vegetable room 6 are separated by a heat insulating partition wall 29. Further, on the front side of each storage chamber of the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5, the air inside the freezing chamber 7 leaks to the outside of the refrigerator through the gaps between the doors 3a, 4a, and 5a, and the outside of the refrigerator. A heat insulating partition wall 30 is provided so that air does not enter each storage chamber.

By providing a plurality of door pockets 33a, 33b, 33c inside the doors 2a and 2b of the refrigerating room 2 and providing a plurality of shelves 34a, 34b, 34c, 34d, the inside of the refrigerating room 2 becomes a plurality of storage spaces. It is partitioned. The freezer compartment 7 and the vegetable compartment 6 are provided with an ice-making chamber container (not shown), an upper freezer compartment container 4b, a lower freezer compartment container 5b, and a vegetable compartment container 6b, which are pulled out integrally with the doors 3a, 4a, 5a, and 6a, respectively. Above the heat insulating partition wall 28 provided, a chilled room 35 set lower than the temperature zone of the refrigerating room 2 is provided. This chilled room has a mode in which the refrigerating temperature range is set to, for example, about 0 to 3 ° C. by controlling the R evaporator 14a and the R fan 9a, which will be described later, and a heater (not shown) provided in the heat insulating partition wall 28. It is possible to switch to a mode in which the refrigerating temperature range is set to, for example, about -3 to 0 ° C.

The R evaporator 14a, which is a refrigerating evaporator, is provided in the R evaporator chamber 8a, which is a refrigerating evaporator chamber provided substantially behind the refrigerating chamber 2. The air that has become cold due to heat exchange with the R evaporator 14a is refrigerated through the refrigerating chamber air passage 11 and the refrigerating chamber discharge port 11a by the R fan 9a, which is a refrigerating fan provided above the R evaporator 14a. The air is blown into the room 2 to cool the inside of the refrigerating room 2. The air blown to the refrigerating chamber 2 returns to the R evaporator chamber 8a from the refrigerating chamber return ports 15a and 15b (see FIG. 3), and is cooled again by the R evaporator 14a.

The F evaporator 14b, which is a freezing evaporator, is provided in the F evaporator chamber 8b, which is a freezing evaporator chamber provided substantially behind the freezing chamber 7. The air that has become cold due to heat exchange with the F evaporator 14b is frozen by the F fan 9b, which is a freezing fan provided above the F evaporator 14b, through the freezing chamber air passage 12 and the freezing chamber discharge port 12a. Air is blown into the chamber 7 to cool the inside of the freezing chamber 7. The air blown to the freezing chamber 7 returns to the F evaporator chamber 8b from the freezing chamber return port 17, and is cooled again by the F evaporator 14b.

In the refrigerator 1 of this embodiment, the vegetable compartment 6 is also cooled by the air cooled by the F evaporator 14b. The air in the F evaporator chamber 8b, which has become cold in the F evaporator 14b, is blown to the vegetable chamber 6 by the F fan 9b through the vegetable chamber air passage (not shown) and the vegetable chamber damper (not shown). Cool the inside of the vegetable compartment 6. When the vegetable compartment 6 has a low temperature, the cooling of the vegetable compartment 6 is suppressed by closing the vegetable compartment damper. The air blown to the vegetable compartment 6 returns from the cold air return portion 18a on the vegetable compartment side provided in front of the lower portion of the heat insulating partition wall 29 to the lower portion of the F evaporator chamber 8b via the vegetable compartment cold air return duct 18.

A refrigerator compartment temperature sensor 41, a freezer compartment temperature sensor 42, and a vegetable compartment temperature sensor 43 are provided on the back side of the refrigerator compartment 2, the freezer compartment 7, and the vegetable compartment 6, respectively, and R evaporation is provided above the R evaporator 14a. An F evaporator temperature sensor 40b is provided above the vessel temperature sensor 40a and the F evaporator 14b, and the refrigerator chamber 2, the freezer compartment 7, the vegetable compartment 6, the R evaporator 14a, and the F evaporator 14b are provided by these sensors. The temperature is being detected. Further, inside the door hinge cover 16 on the ceiling of the refrigerator 1, an outside air temperature sensor 37 for detecting the temperature of the outside air (outside air) and a humidity sensor 38 for detecting the humidity are provided. As other sensors, door sensors (not shown) that detect the open / closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a are also provided.

As shown in FIGS. 2 and 3, a defrost heater 21 for heating the F evaporator 14b is provided in the lower part of the F evaporator chamber 8b. The defrost heater 21 is, for example, an electric heater of 50 W to 200 W, and in this embodiment, it is a radiant heater of 90 W. The defrosted water (melted water) generated during the defrosting of the F evaporator 14b falls on the toy 23b provided at the lower part of the F evaporator chamber 8b, and passes through the drain port 22b and the F drain pipe 27b to the upper part of the compressor 24. It is discharged to the evaporating dish 32 provided in.

The defrosting method of the R evaporator 14a will be described later with reference to FIG. 8, but the defrosted water generated during the defrosting of the R evaporator 14a falls on the toy 23a provided in the lower part of the R evaporator chamber 8a. Then, the water is discharged to the evaporating dish 32 provided on the upper part of the compressor 24 via the drain port 22a and the R drain pipe 27a.

As shown in FIG. 3, the toy 23a is provided with a toy heater 101 that melts the defrosted water when the defrosted water in the toy 23a freezes. Further, the R drainage pipe 27a is provided with a drainage pipe upper heater 102 and a drainage pipe lower heater 103. Each of the heaters 101, 102, and 103 is an electric heater having a power consumption of 20 W or less, which is lower than that of the defrost heater 21, and in this embodiment, the toy heater 101 is 6 W, the drain pipe upper heater 102 is 3 W, and drainage is performed. The lower pipe heater 103 is a 1 W heater.

FIG. 4 is a diagram showing the configuration of the R drainage pipe 27a. In the figure, 201 and 202 indicate the same height positions as 201 and 202 shown in FIG. 3, the range 201 represents the height range of the freezing chamber 7 and the F evaporator chamber 8b, and the range 202 is from the heat insulating partition wall 28. Represents the height range to the lower end of the heat insulating partition wall 29.

The upper part of the R drainage pipe 27a is provided so as to be away from the freezing chamber 7 and the F evaporator chamber 8b so as to be inclined outward from the drainage port 22a toward the outer box 10a side, and drainage is performed in this section. A pipe upper heater 102 is provided. The lower R drain pipe 27a is provided substantially in the vicinity of the outer box 10a, and the drain pipe lower heater 103 is provided up to the lower end of the heat insulating partition wall 29. The R drain pipe 27a at the lower part (lower than the heat insulating partition wall 29) is inclined inward so that the defrost water is discharged to the evaporating dish 32. In this embodiment, both the drain pipe upper heater 102 and the drain pipe lower heater 103 are fixed to the R drain pipe 27a by an aluminum seal having high thermal conductivity, whereby the heater wire is not directly touched. Is also configured so that it can be heated by heat conduction with an aluminum seal.

By disposing the drainage pipe upper heater 102 and the drainage pipe lower heater 103 as described above, the upper ends of the drainage pipe upper heater 102 and the drainage pipe lower heater 103 are provided to a position higher than the upper end of the range 201. The lower end is provided to a position lower than the lower end of the range 201. Since the R drain pipe 27a in the range 201 is cooled by the freezing chamber 7 and the F evaporator chamber 8b in the freezing temperature zone, the temperature inside the R drain pipe 27a becomes negative, and the defrosted water freezes in the R drain pipe 27a. there's a possibility that. On the other hand, by providing the drain pipe upper heater 102 and the drain pipe lower heater 103 in the range 201, even if the water freezes in the drain pipe, it can be thawed, that is, from the R drain pipe 27a to the evaporating dish 32 (see FIG. 3). Can be drained to.

Further, the upper end of the drain pipe upper heater 102 is provided so as to be at a position equal to or higher than the upper end of the range 202, and the lower end of the drain pipe lower heater 103 is at a position equal to or lower than the lower end of the range 202. It is provided so as to be. The heat insulating partition wall 28 and the heat insulating partition wall 29 are in contact with the freezing chamber 7 and the F evaporator chamber 8b in the freezing temperature zone, and at least a part thereof has a negative temperature. Therefore, the inside of the R drain pipe 27a in the height range of the heat insulating partition wall 28 and the heat insulating partition wall 29 may also have a negative temperature, but the drain pipe upper heater 102 and the drain pipe lower heater are within the range equal to or higher than the range 202. By providing 103, drainage from the R drain pipe 27a to the evaporating dish 32 (see FIG. 3) can be performed more reliably. Since the portion of the R drainage pipe 27a inside the heat insulating partition wall 28 is directly cooled by the heat insulating partition wall 28 and tends to become low in temperature, it is particularly effective to provide the drainage pipe upper heater 102 at this portion.

Here, as shown in FIGS. 2 and 3, the toy 23a is configured such that when the R fan 9a is driven, the return air from the refrigerating chamber 2 to the refrigerating chamber evaporator 14a flows. Since the R fan 9a is driven during the defrosting operation of the R evaporator 14a, which will be described later, the toy 23a can be heated by the return air having a positive temperature. As a result, the freezing of the defrosted water in the toy 23a can be suppressed, and even when the toy 23a freezes, the heating amount of the toy heater 101 required for thawing can be suppressed, and the energy saving performance can be improved.

Further, the lower part of the drainage pipe 27a (the place where the lower part heater 103 of the drainage pipe is provided) is closer to the outer box 10a than the freezing chamber 7 and the F evaporator chamber 8b. As a result, especially when the outside air is hot, it can be heated by the outside air through the outer box 10a, so that freezing in the lower part of the drainage pipe 27a is suppressed, and even when frozen, the heating amount of the drainage pipe lower part heater 103 is suppressed. It is possible to improve the energy saving performance. On the other hand, when the outside air is low temperature, the drain pipe lower heater 103 is heated to ensure that the defrosted water can be discharged. In addition, since the defrost water of about 0 ° C. flows through the R drain pipe 27a, the outer box 10a close to the R drain pipe 27a may be cooled by the defrost water, and the temperature may be lower than the dew point temperature. By providing the drain pipe lower heater 103, when the outside air is highly humid, the drain pipe lower heater 103 is energized during the R first defrosting operation and the R second defrosting operation, which will be described later, to reduce the temperature of the outer box 10a. It can be suppressed and dew condensation on the outer box 10a can be suppressed.

On the upper part of the refrigerator 1 (see FIG. 2), a control board 31 on which a CPU, a memory such as ROM and RAM, an interface circuit, etc., which are a part of the control device, is mounted is arranged. The control board 31 is connected to the refrigerator compartment temperature sensor 41, the freezer compartment temperature sensor 42, the vegetable compartment temperature sensor 43, the evaporator temperature sensors 40a, 40b, etc., and the CPU described above sets these output values and the operation unit 26. , Control of the compressor 24, the R fan 9a, the refrigerating fan 9b, the heaters 21, 101, 102, 103 described above, and the refrigerant control valve 52 described later, etc., based on the program or the like recorded in advance in the ROM described above. It is carried out.

FIG. 5 is a circuit diagram showing the electric heater wiring in the refrigerator of the first embodiment. The defrost heater 21, the toy heater 101, the drain pipe upper heater 102, and the drain pipe lower heater 103 are connected to the control board 31, and the heating is controlled by the control board 31. Here, the defrost heater 21 is connected to pins P1 and P4 of the control board 31, the toy heater 101 is connected to pins P2 and P4, and the drain pipe lower heater 103 is connected to pins P3 and P4, which are controlled independently. can do. On the other hand, the drain pipe upper heater 102 is connected to pins P1 and P4 of the control board 31 like the defrost heater 21, and is driven in synchronization with the defrost heater 21. The drainage pipe upper heater 102 can be controlled independently of the toy heater 101 and the drainage pipe lower heater 103, and the number of pins for the drainage pipe upper heater 102 can be reduced while obtaining the effect of improving the energy saving performance described later, and the control board 31 can be controlled. It is possible to reduce costs and reduce installation space.

FIG. 6 is a refrigerator refrigeration cycle (refrigerant flow path) according to the first embodiment. In the refrigerator 1 of this embodiment, dew condensation prevention that suppresses dew condensation on the front portions of the compressor 24, the external radiator 50a that is a heat radiating means for radiating the refrigerant, the wall surface radiating pipe 50b, and the partition walls 28, 29, 30. Pipe 50c, refrigerating capillary tube 53a and refrigerating capillary tube 53b, which are depressurizing means for depressurizing the refrigerant, R evaporator 14a and F evaporator that exchange heat between the refrigerant and the air inside the refrigerator to absorb the heat inside the refrigerator. 14b is provided, and the inside of the refrigerator is cooled by these. Further, a dryer 51 for removing water during the refrigeration cycle, gas-liquid separators 54a and 54b for preventing the liquid refrigerant from flowing into the compressor 24, a three-way valve 52 for controlling the refrigerant flow path, and a check valve are provided. A valve 56 and a refrigerant merging portion 55 for connecting the refrigerant flow are also provided, and these are connected by a refrigerant pipe to form a refrigeration cycle.

The refrigerator 1 of this embodiment uses isobutane, which is a flammable refrigerant, as a refrigerant. Further, the compressor 24 of this embodiment is provided with an inverter and can change the rotation speed.

The three-way valve 52 has two outlets shown by 52a and 52b, and has a refrigerating mode in which the refrigerant flows on the outlet 52a side and a refrigerating mode in which the refrigerant flows on the outlet 52b side, and these can be switched. is there. Further, the three-way valve 52 of the present embodiment also has a fully closed mode that prevents the refrigerant from flowing in both the outlet 52a and the outlet 52b, and a fully open mode that allows the refrigerant to flow, and is switched to these modes as well. It is possible.

In the refrigerator 1 of this embodiment, the refrigerant flows as follows. The refrigerant discharged from the compressor 24 flows in the order of the external radiator 50a, the external radiator 50b, the dew condensation prevention pipe 50c, and the dryer 51, and reaches the three-way valve 52. The outlet 52a of the three-way valve 52 is connected to the refrigerating capillary tube 53a via a refrigerant pipe, and the outlet 52b is connected to the freezing capillary tube 53b via a refrigerant pipe.

When the refrigerant flows to the outlet 52a side, the refrigerant flowing out from the outlet 52a flows in the order of the refrigerating capillary tube 53a, the R evaporator 14a, the gas-liquid separator 54a, and the refrigerant confluence 55, and then the compressor. Return to 24. The low-pressure low-temperature refrigerant in the refrigerating capillary tube 53a flows through the R evaporator 14a, so that the R evaporator 14a becomes low-temperature, and the air in the R evaporator chamber 8a can be cooled, that is, the refrigerating chamber 2 is cooled. be able to.

When the three-way valve 52 is configured so that the refrigerant flows to the outlet 52b side, the refrigerant flowing out from the outlet 52b is a refrigerating capillary tube 53b, an F evaporator 14b, a gas-liquid separator 54b, a check valve 56, and the like. After flowing in the order of the refrigerant merging portion 55, the process returns to the compressor 24. The check valve 56 is arranged so that the refrigerant flows from the gas-liquid separator 54b to the refrigerant merging portion 55 side and does not flow from the refrigerant merging portion 55 to the gas-liquid separator 54b side. The low-pressure low-temperature refrigerant in the refrigerating capillary tube 53b flows through the F-evaporator 14b, so that the F-evaporator 14b becomes low-temperature, and the air in the R-evaporator chamber 8a can be cooled, that is, the freezer chamber 7 is cooled. be able to.

FIG. 7 is an example of a time chart showing cooling operation control in the refrigerator of the first embodiment. Here, it represents a case where the outside air is relatively high temperature (for example, 32 ° C.) and is not low humidity (for example, 60% RH).

Time t ₀ is the time when the refrigerating operation for cooling the refrigerating chamber 2 is started. In the refrigerating operation, the three-way valve 52 is set to the outlet 52a side, the compressor 24 is driven to flow the refrigerant through the R evaporator 14a, and the temperature of the R evaporator 14a is lowered. By operating the R fan 9a in this state, the refrigerating chamber 2 is cooled by the air that has passed through the R evaporator 14a and has become cold. Here, the temperature of the R evaporator 14a during the refrigerating operation is higher than that of the F evaporator 14b during the freezing operation described later. Generally, the higher the temperature of the evaporator, the higher the COP (ratio of the amount of heat to be cooled to the input of the compressor 24) and the higher the energy saving performance. Therefore, as compared with the freezing chamber 7 in which the temperature of the evaporator needs to be lowered, when cooling the refrigerating chamber 2 which can be cooled even at a high temperature of the evaporator, the temperature of the evaporator is raised to improve the energy saving performance. In the refrigerator 1 of the present embodiment, the rotation speed of the compressor 24 during the refrigerating operation is set to be lower than that during the refrigerating operation so that the temperature of the R evaporator 14a during the refrigerating operation becomes high.

When the refrigerating chamber 2 is cooled by the refrigerating operation and the refrigerating chamber temperature detected by the refrigerating chamber temperature sensor 42 _{drops to TRoff} (time t ₁ ), the refrigerating operation is switched to the refrigerant recovery operation. In the refrigerant recovery operation, the compressor 24 is driven with the three-way valve 52 fully closed to recover the refrigerant in the R evaporator 14a. As a result, the shortage of refrigerant in the next freezing operation is suppressed. At this time, the R fan 9a is driven, whereby the residual refrigerant in the R evaporator 14a can be used for cooling the refrigerating chamber 2, and the refrigerant in the R evaporator 14a evaporates to reach the compressor 24. It becomes easy to do so, and a large amount of refrigerant can be recovered in a relatively short time, so that the cooling efficiency can be improved.

When the refrigerant recovery operation is completed (time t ₂ ), the freezing chamber 7 is switched to the freezing operation for cooling. In the freezing operation, the three-way valve 52 is set to the outlet 52b side, the refrigerant flows through the F evaporator 14b, and the temperature of the F evaporator 14b is lowered. By operating the F fan 9b in this state, the freezing chamber 7 is cooled by the air that has passed through the F evaporator 14b and has become cold. This freezing operation is performed until the freezing room temperature detected by the freezing room temperature sensor 41 _{becomes T Foff} (time t _5). Further, the vegetable compartment damper (not shown) is also opened during the freezing operation, and the vegetable compartment 6 is cooled until _{the vegetable chamber temperature detected by the vegetable chamber temperature sensor 43 becomes TRoff} (time t _3).

Further, in the refrigerator 1 of the present embodiment, the first defrosting operation of the R evaporator 14a (hereinafter referred to as the R first defrosting operation) is also performed during this freezing operation. The R first defrosting operation is performed by driving the R fan 9a. Since the refrigerant does not flow into the R evaporator 14a during the refrigerating operation, when the air in the refrigerating chamber 2 passes through the R evaporator 14a, it exchanges heat with the refrigerating chamber 2 having a temperature higher than that of the R evaporator 14a. The frost adhering to the R evaporator 14a and the R evaporator 14a is heated. Defrosting of the R evaporator 14a is performed by this heating. The air is cooled by the frost adhering to the R evaporator 14a and the R evaporator 14a, and this air is blown to the refrigerator chamber 2 by the R fan 9a, so that the refrigerator chamber 2 is cooled (suppressing the temperature rise). be able to. Therefore, the frost adhering to the R evaporator 14a can be melted without using a heater, and in addition, the refrigerating chamber 2 can be cooled. Therefore, the R first defrosting operation of this embodiment has high energy-saving performance. It is a frost operation. The R first defrosting operation is carried out until the refrigerating evaporator temperature detected by the refrigerating evaporator temperature sensor 40a is T _DR (time t _4).

When the end conditions of both the first defrosting operation and the refrigerating operation are satisfied (time t ₅ ), the refrigerant recovery operation for driving the compressor 24 with the three-way valve 52 fully closed is performed again, and the inside of the F evaporator 14b is performed. Recover the refrigerant and suppress the refrigerant shortage in the next refrigeration operation. At this time, the F fan 9b is driven, whereby the residual refrigerant in the F evaporator 14b can be used for cooling the freezer chamber 7, and the refrigerant in the F evaporator 14b evaporates to reach the compressor 24. It becomes easy to do so, and a large amount of refrigerant can be recovered in a relatively short time, so that the cooling efficiency can be improved.

At time t ₆ when the return to the refrigerating operation to repeat the operation described above. The above is the basic cooling operation of the refrigerator of this embodiment and the first defrost control of the R evaporator 14a. By these operations, the refrigerating chamber 2, the freezing chamber 7, and the vegetable compartment 6 are cooled and maintained at a predetermined temperature, while suppressing the frost growth of the R evaporator 14a.

If the end condition of the refrigerating operation (the temperature of the freezer becomes _{T Foff} ) is satisfied before the end condition of the R first defrosting operation (the temperature of the evaporator for refrigeration _{becomes T DR) is satisfied, R} The compressor 24 is turned off while the first defrosting operation is continued. After that, if the end condition of the R first defrosting operation is satisfied, the compressor 24 is turned on and the refrigerating operation is started. As a result, it is possible to prevent the frost and defrosted water adhering to the R evaporator 14a during thawing from being cooled again by the refrigerating operation and refreezing, so that the R evaporator 14a can be defrosted more reliably.

Further, the freezing compartment temperature exceeds a predetermined value at time _{t 1} and time _{t 2} (e.g. _{T FOFF} + 1 ℃) is lower than, also the time _{t 5} and the refrigerating compartment temperature exceeds a predetermined value at time _{t 6} (e.g., _{T ROFF} + 1 ℃) If it is lower than, the compressor 24 is stopped. As a result, excessive cooling inside the refrigerator can be suppressed.

It should be noted that the R first defrosting operation does not necessarily have to be performed during the refrigerating operation, and when the refrigerating chamber doors 2a and 2b are rarely opened and closed and the surroundings are low humidity (for example, 50% RH or less), they adhere to the R evaporator 14a. Since the amount of frost generated is small, the R first defrosting operation is performed once every three refrigerating operations in the refrigerator 1 of this embodiment. As a result, by reducing the frequency of the R first defrosting operation, the electric power used to drive the R fan 9a can be suppressed and the energy saving performance can be improved. On the other hand, when the refrigerating chamber doors 2a and 2b are frequently opened and closed, or when the surroundings are highly humid, the amount of frost adhering to the R evaporator 14a is large and the cooling efficiency may decrease. In the refrigerator 1, the R first defrosting operation is performed every refrigerating operation. As a result, it is possible to suppress a decrease in cooling efficiency and improve energy saving performance.

FIG. 8 is an example of a time chart showing RF defrosting operation control in the refrigerator of Example 1. Here, the case where the outside air is relatively high temperature (for example, 32 ° C.) and not high humidity (for example, 60% RH) is represented. This RF defrosting operation is an operation for defrosting both the R evaporator 14a and the F evaporator 14b.

The refrigerator 1 of this embodiment satisfies, for example, the start condition of the defrosting operation determined from the number of times of opening and closing of the doors 2a, 2b, 3a, 4a, 5a, 6a, the total driving time of the compressor 24, and the like (time t). _{In d0} ) and the refrigerator 1 of this embodiment, a freezing operation is performed. This suppresses the melting of frozen foods, ice, etc. due to the temperature rise of the freezing chamber 7 during the RF defrosting operation. Further, during this period, the R first defrosting operation (R fan 9a is turned on) is performed to heat the frost adhering to the R evaporator 14a and the R evaporator 14a, and the R second defrosting operation described later is completed in a short time. I am trying to do it.

After performing this refrigerating operation for a predetermined time, for example, 30 minutes (time t _d1 ), the refrigerator 1 of this embodiment has a defrosting operation of the F evaporator 14b (hereinafter referred to as F defrosting operation) and a first of the R evaporators 14a. (Ii) Defrosting operation (hereinafter referred to as R second defrosting operation) is performed.

First, the control related to the F defrosting operation will be described. The compressor 24 and the F fan 9b are turned off, and the defrost heater 21 is turned on. The frost adhering to the F evaporator 14b and the F evaporator 14b is heated by the defrost heater 21, and the temperature gradually rises. When the temperature rises above the melting temperature (0 ° C.), the frost adhering to the F evaporator 14b melts. .. Freezing evaporator temperature detected by the freezing evaporator temperature sensor 40b is above the melting temperature of the frost becomes sufficiently high T _{DF (e.g.} 10 ° C.) (time t _d4), and terminates the F defrosting operation, removal Turn off the frost heater 21. As a result, the F evaporator 14b is defrosted.

Next, the control related to the R second defrosting operation will be described. In the R second defrosting operation, as in the R first defrosting operation, the R fan 9a is driven and heat is exchanged with the refrigerating chamber 2 having a temperature higher than that of the R evaporator 14a, thereby causing the R evaporator 14a and the R evaporator. The frost adhering to 14a is heated to remove the frost. In addition, in the R second defrosting operation performed during the RF defrosting operation, the toy heater 101 and the drain pipe upper heater 102 are turned on (time t _d1 ). The operation of turning on the R fan 9a, the toy heater 101, and the drain pipe upper heater 102 is performed until _{the refrigerating evaporator temperature reaches T DR2} (time t _{d2). In the R second defrosting operation, the end temperature T DR2} is set to a temperature higher than the R first defrosting operation end temperature T _DR so that the frost of the R evaporator 14a can be melted and discharged more reliably. When the temperature of the evaporator for refrigeration reaches T _DR2 (time t _d2 ), the R fan 9a is turned off in this embodiment. The toy heater 101 continues to be energized even after the R fan 9a is turned off, and is turned off after a time Δt _d5 . The defrosted water generated in the R second defrosting operation flows through the toy 23a and the R drain pipe 27a, and the defrosting of the refrigerating evaporator 14b is completed, and the lower part of the drain pipe 27a (the drain pipe lower heater 103 is provided). Since there will be a time delay in the arrival of the defrosted water at the location), it is necessary to heat the defrosted water for a predetermined time even after the _{temperature of the evaporator for refrigeration reaches T DR2, so that the defrosted water can be discharged more reliably.} Can be done. As will be described later with reference to FIG. 9, the time Δt _d5 changes depending on the outside air and the opening and closing of the door.

When both the end condition of the F defrosting operation (the temperature of the refrigerating evaporator is T _DF or higher) and the end condition of the R second defrosting operation (R evaporator 14a is T _{DR 2} or higher) are satisfied (time t _d3 ). The RF defrosting operation is ended, the compressor 24 is turned on again, and the cooling operation control is started. The cooling operation immediately after the RF defrosting operation is completed starts from the freezing operation. As a result, melting of frozen foods, ice, etc. in the freezing chamber 7 is suppressed. Further, the first switching from the refrigerating operation to the refrigerating operation (to be exact, switching to the refrigerant recovery operation before the refrigerating operation) is _{T Foff 2} in which the freezing chamber temperature is higher than _{the T Foff during the cooling control shown in FIG.} (Time t _d3 ). As a result, while suppressing the melting of frozen foods, ice, etc. in the freezing chamber 7, the excessive temperature rise of the refrigerating chamber 2 is also suppressed.

The above is the structure and basic control of the refrigerator 1 of this embodiment. This detailed effect will be described below.

In the refrigerator 1 of this embodiment, two types of defrosting operations of the refrigerating cooler 14a are provided. That is, the R first defrosting operation performed during the cooling operation control shown in FIG. 7 and the R second defrosting operation performed during the RF defrosting operation shown in FIG. 8 are provided.

The R first defrosting operation performed during the cooling operation is performed in a state where the freezing chamber 7 and the F evaporator chamber 8b are at a low temperature as shown in FIG. The upper part of the R drain pipe 27a and the toy 23a shown in FIG. 3 exchange heat with the adjacent freezing chamber 7 and F evaporator chamber 8b. Therefore, even if the toy heater 101 and the drain pipe upper heater 102 are heated during the R first defrosting operation, the freezing chamber 7 and the F evaporator chamber 8b are heated. Further, since the temperature of the toy 23a and the R drainage pipe 27a is difficult to rise because it is cooled by the freezing chamber 7 and the F evaporator chamber 8b, it is necessary to increase the heating amount as compared with the second defrosting operation. Therefore, when the toy heater 101 and the drain pipe upper heater 102 are energized during the R first defrosting operation, the power consumption of the heater required to heat the toy 23a and the R drain pipe 27a to a positive temperature is large, and in addition, the freezing chamber Since the 7 and the F evaporator chamber 8b are heated, the amount of heat to be cooled in the refrigerating operation also increases, so that the energy saving performance deteriorates.

On the other hand, since the R second defrosting operation is performed during the RF defrosting operation, the cooling of the freezer chamber 7 and the F evaporator chamber 8b is suppressed as shown in FIG. 8, and the F evaporator 14b is added. Since it is heated to a temperature, the temperature of the F evaporator chamber 8b is particularly high. Since the cooling of the toy 23a and the R drain pipe 27a by the freezing chamber 7 and the F evaporator chamber 8b is suppressed, the temperature of the toy 23a and the R drain pipe 27a is set to a positive temperature with a small amount of heating, that is, the toy 23a and the R drain pipe 27a The frozen defrost water can be thawed and discharged at the temperature of. Therefore, by heating the toy heater 101 and the drain pipe upper heater 102 during the R second defrosting operation, the defrosted water can be reliably discharged while suppressing the power consumption.

Further, the R first defrosting operation is performed during the cooling operation, for example, in this embodiment, it is performed as frequently as once every 80 minutes, whereas the R second defrosting operation is performed during the RF defrosting operation. Therefore, the frequency is low, from 12 hours to once every few days. When the toy heater 101 and the drain pipe upper heater 102 are heated to melt the defrosted water, in addition to the amount of heat used for melting the defrosted water, the toys 23a and R drainage that have become cold due to the freezing chamber 7 and the F evaporator chamber 8b. The amount of heat required to heat the tube 27a to a positive temperature is required. The amount of heat used to melt the defrost water is determined by the amount of frozen defrost water regardless of the frequency of heating, but the amount of heat to heat the toys 23a and R drain pipe 27a to a positive temperature is determined by the number of times of heating. The more often you do, the more heat you need. Therefore, by reducing the frequency of melting the defrost water and concentrating the heating on the toy heater 101 and the drain pipe upper heater 102 in the R second defrost operation to discharge the defrost water, the toy heater 101 and the drain pipe upper part are discharged. The heating time of the heater 102 can be suppressed and the amount of power consumption can be reduced.

As described above, the energization control of the heater is changed between the R first defrosting operation performed during the cooling operation control and the R second defrosting operation performed during the RF defrosting operation, and the toy heater is mainly used during the RF defrosting operation. By energizing the 101 and the upper heater 102 of the drain pipe, a refrigerator having high energy-saving performance can be obtained while surely discharging the defrosted water.

The effect of improving the energy saving performance by this control is particularly effective in the energization control of the drain pipe upper heater 102. As described above with reference to FIGS. 2 and 3, the lower part of the toy 23a and the R drainage pipe 27a (the place where the drainage pipe lower part heater 103 is provided) is heated by the air and the outside air of the refrigerating chamber 2 and is heated by the heater. Heating is not essential for draining defrost water, and if heating is required, the amount of heating required is small. On the other hand, since the location where the drain pipe upper heater 102 is provided is provided near the freezing chamber 7 and the F evaporator chamber 8b as shown in FIG. 3, it is likely to have a negative temperature. Therefore, regardless of the surrounding environment, the drain pipe upper heater 102 is heated during the R second defrosting operation to ensure that the defrosted water can be discharged reliably. That is, by energizing the drain pipe upper heater 102 in the R second defrosting operation, a refrigerator having high energy saving performance can be obtained while surely discharging the defrosted water.

Further, in this embodiment, since the drain pipe upper heater 102 is heated during the R second defrosting operation regardless of the surrounding environment, the control of the drain pipe upper heater 102 and the defrost heater 21 may be linked. Therefore, in this embodiment, as shown in FIG. 5, the pins for controlling the defrost heater 21 and the drain pipe upper heater 102 are both shared with P1 and P4. As a result, the above-mentioned effect can be obtained while suppressing the number of pins and reducing the cost of the control board 31.

On the other hand, the other toy heater 101 and the drain pipe lower heater 103 can obtain higher energy saving performance by using different control pins. The reason for this will be explained below.

FIG. 9 summarizes the heating control of the heaters 101, 102, and 103 during the RF defrosting operation of the first embodiment. (A) is a case where the outside air is high temperature, and (b) is a case where the outside air is low temperature. The toy heater 101 is basically heated during the R second defrosting operation, but when the outside air is hot and humid, or when the refrigerating chamber doors 2a and 2b are frequently opened and closed, Δt _d5 is lengthened to heat the toy heater 101. Increase the amount. This is because, in the above case, a large amount of frost is formed on the R evaporator 14a during the refrigerating operation, and a large amount of defrost water may be accumulated in the toy 23a. This is because it is possible that the number will increase. That is, by controlling the heating amount of the toy heater 101 according to the amount of defrosted water of the toy 23a, the defrosted water is thawed even when the defrosted water generated in the R first defrosting operation is frozen in the toy 23a. It can be discharged, and when the amount of defrosted water is small, the heating of the heater can be suppressed. Therefore, it is possible to further improve the energy saving performance while reliably discharging the defrosted water. In addition, when the outside air is low temperature and low humidity and the refrigerating chamber doors 2a and 2b are opened and closed less frequently, the cooling load is small and the refrigerating operation for lowering the temperature of the R evaporator 14a is small. Therefore, as shown in FIG. 9B, the toy heater 101 The heating of the heater is set to zero, and the input of the heater is further suppressed to improve the energy saving performance.

Further, the drain pipe lower heater 103 of this embodiment is turned off when the temperature of the outside air is relatively high. As shown with reference to FIG. 3, the portion where the drain pipe lower heater 103 is provided can be heated by the outside air via the outer box 10a, and the possibility of freezing is low. Therefore, the heating of the heater is suppressed to improve the energy saving performance. ing. On the other hand, when the temperature is relatively low, the heating by the outside air is small, so that the defrost water can be reliably discharged by turning on the drain pipe lower heater 103.

Further, the drain pipe lower heater 103 is energized even when the outside air is high humidity (for example, relative humidity 80%). As described above with reference to FIG. 3, since the defrost water at about 0 ° C. flows through the R drain pipe 27a during defrosting, the outer box 10a adjacent to the R drain pipe 27a is cooled by the defrost water and has high humidity. Since the surface of the outer box 10a may sometimes be lower than the dew point temperature, the drain pipe lower heater 103 is energized to suppress dew condensation on the outer box 10a. Since this phenomenon may occur in both the R first defrosting and the R second defrosting, when the humidity is relatively high, the R second defrosting and the R first defrosting are performed. In either case, by energizing the drain pipe lower heater 103, dew condensation on the outer box 10a is more reliably suppressed.

As described above, since the toy heater 23a, the drain pipe upper heater 102, and the drain pipe lower heater 103 have different heating conditions and conditions for changing the heating amount, the heaters are divided into three in this embodiment. Different control pins are used so that they can be controlled independently. As a result, it is possible to control the energization of the heater under the conditions corresponding to each, and it is possible to suppress unnecessary heating of the heater and improve the energy saving performance while surely discharging the defrosted water. In particular, since the toy heater 101 has the highest power consumption among the heaters 101 to 103, it is effective to control the toy heater 101 independently of the drain pipe lower heater 103 to improve the energy saving performance.

As shown in FIGS. 3 and 4, the drainage pipe upper heater 102 and the drainage pipe lower heater 103 of this embodiment are inclined downward from the drainage port 22a toward the outer box 10a side. It is divided into a section to be directed and a section provided in the vicinity of the outer box 10a at the lower part, but the division position of the drainage pipe upper heater 102 and the drainage pipe lower heater 103 is not limited to this condition. Instead, the drain pipe upper heater 102 that is heated during the RF defrosting operation may be provided at a location that is thermally closer to the F evaporator chamber 8b or the freezing chamber 7 than the outside air.

Here, the thermal proximity to the F evaporator chamber 8b and the like means that the temperature of the R drain pipe 27a affects the temperature of the F evaporator chamber 8b or the freezing chamber 7 more than the outside air. That is, the heat insulating performance between the outside air and the R drain pipe 27a is arranged to be higher than the heat insulating performance between the F evaporator chamber 8b or the freezing chamber 7 and the R drain pipe 27a. For example, the R drainage pipe 27a is arranged closer to the inner box 10b than the outer box 10a.

FIG. 10 is a cross-sectional view showing the arrangement relationship between the outer box 10a, the inner box 10b, and the R drain pipe 27a. (A) is a sectional view taken along the line CC of FIG. 3 in which the upper heater 102 of the drain pipe is arranged, and (b) is a sectional view taken along the line DD of FIG. 3 in which the lower heater 103 of the drain pipe is arranged. When the thermal conductivity of the straight section connecting the inner box 1b, the R drain pipe 27a, and the outer box 1a in contact with the F evaporator chamber 8b or the freezing chamber 7 is almost constant, the distance L1 between the R drain pipe 27a and the outer box 10a. On the other hand, when the distance L2 between the R drain pipe 27a and the inner box 10b is short, it is more susceptible to the F evaporator chamber 8b or the freezing chamber 7 than the outside air (outer box 1a). Therefore, it is effective to provide the drain pipe upper heater 102 in the section where L1> L2 shown in FIG. 10A. Further, as shown in FIG. 10A, a vacuum heat insulating material 25 having a low thermal conductivity of a heat insulating member 10 is arranged between the R drain pipe 27a and the outer box 1a in the upper part of the R drain pipe 27a. Therefore, since the thermal resistance between the R drain pipe 27a and the outer box 1a is large, it is more easily affected by the F evaporator chamber 8b or the freezing chamber 7. Therefore, the portion inside the vacuum heat insulating material 25 is the drain pipe upper heater 102. It is effective to provide.

On the other hand, as shown in FIG. 10B, the lower portion of the R drainage pipe 27a is arranged close to the outer box 10a so that L1 <L2. This makes it more susceptible to the influence of the outside air. In addition, the vacuum heat insulating material 25 is not provided between the R drain pipe 27a and the outer box 1a, so that the structure is more susceptible to the influence of the outside air. As a result, the amount of heating to the R drainage pipe 27a by the heat of the outside air can be increased, and the input of the heater required for freezing suppression and thawing of the defrost water in the R drainage pipe 27a can be suppressed. Therefore, a part of the R drainage pipe 27a is arranged closer to the outer box 1a than the inner box 1b, and the R drainage pipe 27a to the F evaporator chamber 8b or the refrigerator is better than the heat insulating performance on the outside air side from the R drainage pipe 27a. By arranging the R drain pipe 27a so that the heat insulating performance between the chambers 7 is high, the R drain pipe 27a can be heated, that is, the heater can be not used or the heating amount of the heater can be suppressed, which is reliable. A refrigerator with high energy-saving performance can be obtained while discharging defrost water.

For example, the vacuum heat insulating material 25 may be arranged on the inner box 10b side of the R drain pipe 27a. Since the heat insulating performance between the R drain pipe 27a and the F evaporator chamber 8b or the freezing chamber 7 is higher than the heat insulating performance on the outside air side from the R drain pipe 27a, the above-mentioned effect can be obtained.

Further, in the present embodiment, the boundary point between the upper region of the R drain pipe 27a inclined toward the outer box 10a side and the lower region arranged in the substantially vertical direction is higher than the upper end of the F evaporator 14b. It is a position. Therefore, at a height at which the temperature tends to be negative due to the influence of the F evaporator 14b, the R drain pipe 27a can be arranged at a location far from the evaporator 14b, and the defrosted water can be reliably discharged. At this time, it is effective to make the lower region longer than the upper region of the R drain pipe 27a and increase the ratio of the state close to the outer box 10a.

Further, in the present embodiment, the configuration in which the drainage pipe upper heater 102 and the drainage pipe lower heater 103 are independently controlled by separate heaters is shown, but the drainage pipe upper heater 102 and the drainage pipe lower heater 103 are common 1 It may be composed of a plurality of heaters. In that case, it is desirable that the heater density of the upper part of the R drainage pipe 27a, which is close to the freezing chamber 7 and the F evaporator room 8b and tends to have a negative temperature, be higher than the heater density of the lower part of the R drainage pipe 27a.

The above is an example showing the embodiment of the present embodiment. The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to add / delete / replace a part of the configuration of the embodiment with another configuration.

1 Refrigerator 2 Refrigerator room 2a, 2b Refrigerator room door 3 Ice making room 4 Upper freezing room 5 Lower freezing room Freezing room 3a, 4a, 5a Freezing room door 6 Vegetable room 6a Vegetable room door 7 Freezing room (3, 4, 5) )
8a R Evaporator room (refrigerator room)
8b F Evaporator room (freezing evaporator room)
9a R fan (refrigerator fan)
9b F fan (freezing fan)
10 Insulated box body 10a Outer box 10b Inner box 11 Refrigerator room air passage 11a Refrigerator room air passage 12 Freezer room air passage 12a Freezer room discharge port 14a R Evaporator (refrigerator evaporator)
14b F evaporator (freezing evaporator)
15a, b Refrigerator return port 16 Hing cover 17 Freezer room return port 18 Vegetable room return port 18a Vegetable room return port 21 Radiant heater 22a, 22b Drain port 23a, 23b Toy 24 Compressor 27a R Drain pipe 27b F Drain pipe 28 , 29, 30 Insulation partition wall 31 Control board 32 Evaporator 35 Chilled room 39 Machine room 40a R Evaporator temperature sensor 40b F Evaporator temperature sensor 41 Refrigerator room temperature sensor 42 Freezer room temperature sensor 43 Vegetable room temperature sensor 50a, 50b Heat dissipation Vessel 51 Dryer 52 Three-way valve (refrigerant control means)
53a Capillary tube for refrigeration (decompression means)
53b Capillary tube for freezing (decompression means)
54b Refrigerating gas-liquid separator 54b Refrigerating gas-liquid separator 55 Refrigerant confluence 56 Check valve 57a, 57b Heat exchange 101 Toy part heater 102 Drain pipe upper heater 103 Drain pipe lower heater P1 to P4 pins

Claims (6)

A refrigerator provided with a refrigerating chamber, a refrigerating evaporator for cooling the refrigerating chamber, a refrigerating fan for blowing air cooled by the refrigerating evaporator to the refrigerating chamber, a refrigerating evaporator, and the refrigerating fan. The refrigerator chamber, the refrigerating chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber, the freezing chamber, the refrigerating evaporator for cooling the freezing chamber, and the refrigerating evaporator were used for cooling. A refrigerating fan that blows air into the freezing chamber, a refrigerating evaporator chamber provided with the refrigerating evaporator and the refrigerating fan, and a freezer chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber. A first heater for heating the refrigerating evaporator,
A refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by air to remove the frost, and a refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by the first heater to remove the frost. Equipped with frost operation
In the freezing evaporator room or the refrigerator in which the freezing room is provided below the refrigerating evaporator room.
A second heater is provided in the drainage path for discharging the defrosted water generated from the refrigerating evaporator to the outside of the refrigerator.
During the freezing defrosting operation, the second heater is energized and
A third heater is provided in the drainage path at a location closer to the outside air than the freezing evaporator chamber or the freezing chamber.
The third heater is a refrigerator that energizes when the outside air is cold. A refrigerator provided with a refrigerating chamber, a refrigerating evaporator for cooling the refrigerating chamber, a refrigerating fan for blowing air cooled by the refrigerating evaporator to the refrigerating chamber, a refrigerating evaporator, and the refrigerating fan. The refrigerator chamber, the refrigerating chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber, the freezing chamber, the refrigerating evaporator for cooling the freezing chamber, and the refrigerating evaporator were used for cooling. A refrigerating fan that blows air into the freezing chamber, a refrigerating evaporator chamber provided with the refrigerating evaporator and the refrigerating fan, and a freezer chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber. A first heater for heating the refrigerating evaporator,
A refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by air to remove the frost, and a refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by the first heater to remove the frost. Equipped with frost operation
In the freezing evaporator room or the refrigerator in which the freezing room is provided below the refrigerating evaporator room.
A second heater is provided in the drainage path for discharging the defrosted water generated from the refrigerating evaporator to the outside of the refrigerator.
During the freezing defrosting operation, the second heater is energized and
A third heater is provided in the drainage path at a location closer to the outside air than the freezing evaporator chamber or the freezing chamber.
The third heater is a refrigerator that energizes when the outside air is highly humid. A refrigerating chamber, a refrigerating evaporator for cooling the refrigerating chamber, a refrigerating fan for blowing air cooled by the refrigerating evaporator to the refrigerating chamber, and a refrigerating evaporator chamber for accommodating the refrigerating evaporator. A refrigerating chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber, a freezing chamber, and a refrigerating evaporator for cooling the refrigerating chamber are provided.
A refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by air to remove the frost, and a refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by the first heater to remove the frost. Driving and feasible,
In a refrigerator which is disposed a refrigeration evaporator chamber which accommodates the freezing chamber or the refrigerating evaporator to the lower part of the refrigerating evaporator chamber,
In the drainage path for discharging the defrosted water generated from the refrigerating evaporator to the outside of the refrigerator, a heater is provided in a place closer to the outside air than the freezing chamber or the freezing evaporator chamber.
The heater is a refrigerator that energizes when the outside air is cold. A refrigerating chamber, a refrigerating evaporator for cooling the refrigerating chamber, a refrigerating fan for blowing air cooled by the refrigerating evaporator to the refrigerating chamber, and a refrigerating evaporator chamber for accommodating the refrigerating evaporator. A refrigerating chamber air passage connecting the refrigerating evaporator chamber and the refrigerating chamber, a freezing chamber, and a refrigerating evaporator for cooling the refrigerating chamber are provided.
A refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by air to remove the frost, and a refrigerating defrosting operation in which the frost adhering to the refrigerating evaporator is heated by the first heater to remove the frost. Driving and feasible,
In a refrigerator which is disposed a refrigeration evaporator chamber which accommodates the freezing chamber or the refrigerating evaporator to the lower part of the refrigerating evaporator chamber,
In the drainage path for discharging the defrosted water generated from the refrigerating evaporator to the outside of the refrigerator, a heater is provided in a place closer to the outside air than the freezing chamber or the freezing evaporator chamber.
The heater is a refrigerator that energizes when the outside air is highly humid. An outside air temperature sensor that detects the temperature of the outside air,
A second heater is provided in the drainage path for discharging the defrosted water generated from the refrigerating evaporator to the outside of the refrigerator.
Any of claims 1 to 4, wherein at least a part of the second heater is provided in the drainage path at a position thermally closer to the freezing evaporator chamber or the freezing chamber than the outside air. The refrigerator described in item 1. The refrigerator according to claim 2, 4 or 5, further comprising an outside air humidity sensor that detects the humidity of the outside air.

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