JP2019138513A - refrigerator - Google Patents

Abstract

To prevent overflow of water from a water tray (trough) receiving water generated in an evaporator for refrigeration and to improve durability of a sensor for detecting a temperature of the trough, in a refrigerator including a cooling temperature zone chamber at an upper part of a freezing temperature zone chamber, and having not only an evaporator for freezing but also the evaporator for refrigeration.SOLUTION: In a refrigerator including storage chambers of a cooling temperature zone chamber and a freezing temperature zone chamber successively from an upper part, and further having a compressor, an evaporator for refrigeration capable of supplying cold air to the cooling temperature zone chamber, an evaporator for freezing capable of supplying cold air to the freezing temperature zone chamber, a trough for collecting water generated in the evaporator for refrigeration, a temperature sensor detecting a temperature of the trough, and heating means for heating the trough, the temperature sensor is disposed at an inner side of a formation member of the trough without exposed to an inner face of the trough.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a refrigerator.

  Patent Document 1 (Japanese Patent Laid-Open No. 2003-130535) states that “the interior of a heat insulating box formed by filling a heat insulating material between an outer box and an inner box is divided into at least a freezer compartment and a refrigerator compartment including a vegetable compartment. A cold air generating chamber provided with a first cooler corresponding to the freezer compartment and a first blower for forced air circulation at the rear of the freezer compartment, and provided with a partition body; A rear cooler and a second cooler corresponding to the vegetable compartment and a second blower for forced air circulation are provided at the rear, a cold air generating chamber partitioned by a partition is provided, and the first (2) A water tray for receiving defrosted water from the cooler is provided, and a drainage channel is provided between the drain port of the water tray and the evaporating dish in the machine room provided at the lower rear of the heat insulation box. “A configuration in which a heater for preventing defrost water from being frozen is provided inside the water tray” A temperature detection sensor is provided on the inner side wall of the tray, and when the detected temperature falls below a predetermined value, power is supplied to the heater for several minutes to evaporate defrost water. There is described a refrigerator in which the water remaining in the water receiving tray is frozen during operation so that there is no problem of closing the drain hole of the water receiving tray (paragraph 0007, paragraph 0018, paragraph 0026 of Patent Document 1). reference).

JP 2003-130535 A

  The refrigerator of patent document 1 provides the temperature detection sensor in the side wall of the water receiving tray which receives the defrost water of a 2nd cooler, and is trying to eliminate the malfunction which plugs up the drain hole of a water receiving tray. That is, water is prevented from being discharged from the water tray, overflowing from the water tray, and entering the food storage space.

  However, in the refrigerator of Patent Document 1, the temperature detection sensor protrudes from the inner surface of the water tray, and water is directly applied to the temperature detection sensor. In addition, the water is frozen and thawed, resulting in a change in volume, etc. There exists a subject that a temperature detection sensor may lead to insulation failure.

  Accordingly, the present invention provides a water tray (toy) for receiving water generated by a refrigeration evaporator in a refrigerator having a refrigeration temperature zone chamber above the refrigeration temperature zone chamber and having not only the refrigeration evaporator but also the refrigeration evaporator. The purpose is to prevent the overflow of water from the water and to improve the durability of the sensor that detects the temperature of the toy.

  The present invention made in view of the above problems includes a storage room in the order of a refrigeration temperature zone chamber and a refrigeration temperature zone chamber from above, a compressor, a refrigeration evaporator capable of supplying cold air to the refrigeration temperature zone chamber, A refrigerating evaporator capable of supplying cold air to the freezing temperature zone; a toy for collecting water generated by the refrigerating evaporator; a temperature sensor for detecting the temperature of the toy; and for heating the toy The refrigerator is characterized in that the temperature sensor is provided inside the toy forming member without being exposed to the inner surface of the toy.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing the water which generate | occur | produces with the evaporator for refrigeration overflowing from a toy, the refrigerator which improved the durability of the sensor which detects the temperature of a toy can be provided.

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 composition of the drain pipe for refrigeration Location of the toy heater 101 and the toy temperature sensor 45 (a bottom view inside the heat insulating partition wall 28) The circuit diagram which shows the electric heater wiring in the refrigerator of Example 1 Schematic which shows the refrigerating cycle structure in the refrigerator of Example 1. An example of the time chart which shows the cooling operation control in the refrigerator of Example 1 Control flowchart regarding refrigeration operation in refrigerator of embodiment 1 An example of a time chart showing RF defrosting operation control in the refrigerator of Example 1 Control flowchart regarding RF defrosting operation in refrigerator of embodiment 1 Heater control flowchart performed during the cooling operation in the refrigerator of the first embodiment. Example of time chart showing heater control during cooling operation at the time of ice temperature setting in the refrigerator of Example 1 (when the amount of water in the R toy 23a is small) An example of a time chart showing heater control during cooling operation at the time of ice temperature setting in the refrigerator of the first embodiment (when there is a large amount of water in the R toy 23a) The table | surface which shows the energization amount of the heater in the refrigerator of Example 1 Table summarizing control in each mode of the storage room in the refrigerator in the refrigerator of Example 1

  Hereinafter, embodiments of the present invention will be described.

<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 cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG. The box 10 of the refrigerator 1 has a storage room in the order of a refrigerator compartment 2 from above, 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. The refrigerator 1 includes a door that opens and closes the opening of each storage chamber. These doors open and close the opening of the refrigerating room 2, and are divided into left and right rotating refrigerating room doors 2 a and 2 b, and the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6. A drawer-type ice making door 3a, an upper freezer compartment door 4a, a lower freezer compartment 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 freezer room 7 is basically a storage room in which the inside of the refrigerator is in the freezing temperature zone (less than 0 ° C.), for example, about −18 ° C., and the refrigerator compartment 2 and the vegetable compartment have a refrigerator temperature zone (0 For example, the refrigerator compartment 2 is a storage room having an average of about 4 ° C., and the vegetable room is an average of about 7 ° C.

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

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

A plurality of door pockets 33a, 33b, 33c are provided inside the doors 2a, 2b of the refrigerator compartment 2 and a plurality of shelves 34a, 34b, 34c, 34d are provided, so that the inside of the refrigerator compartment 2 is provided with a plurality of storage spaces. It is partitioned. In the freezer compartment 7 and the vegetable compartment 6, an ice making container (not shown), an upper freezer container 4b, a lower freezer container 5b, and a vegetable compartment container 6b that are pulled out integrally with the doors 3a, 4a, 5a, 6a, respectively. Above the heat insulating partition wall 28 provided, an internal storage chamber 35 which is an internal storage space provided in the refrigerator compartment 2 is provided. The internal storage room 35 is sealed to suppress drying of the food provided in the internal storage room 35 and to reduce the inside for the purpose of preventing oxidation of the food provided in the internal storage room 35. The interior storage chamber 35 has a structure in which cold air is not directly blown. The internal storage room 35 has a chilled mode in which the food stored therein is brought into a refrigeration temperature range (for example, about 0 to 3 ° C.) close to the temperature of the refrigeration room 2 and a freezing temperature lower than that of the refrigeration room 2. The ice temperature mode can be switched to a belt (eg, about −3 to 0 ° C.). Since the internal storage chamber 35 is adjacent to the freezer compartment 7 through the heat insulating partition wall 28, the ice storage mode in the freezing temperature zone can be made by combining with the control described later. Note that a heater (not shown) is provided in the heat insulating partition wall 28, and the two modes are switched by the control of the compressor 24 and the R fan 9a and the control of this heater, as will be described in detail later.

  The R evaporator 14a which is a refrigeration evaporator is provided in an R evaporator chamber 8a which is a refrigeration evaporator chamber provided substantially at the back of the refrigeration chamber 2. The air cooled to the low temperature by exchanging heat with the R evaporator 14a is refrigerated via the refrigerating chamber air passage 11 and the refrigerating chamber discharge port 11a by the R fan 9a which is a refrigeration fan provided above the R evaporator 14a. The air is blown into the chamber 2 to cool the inside of the refrigerator compartment 2. The air blown into the refrigerator compartment 2 returns to the R evaporator chamber 8a from the refrigerator outlets 15a and 15b (see FIG. 3), and is cooled again by the R evaporator 14a. The refrigerator return ports 15a and 15b are provided with slits smaller than the minimum diameters of the drain port 22a and the R water pipe 27a, which will be described later, to prevent clogging of food at the drain port 22a and the R water pipe 27a.

  The refrigerator compartment discharge port 11a of the refrigerator compartment 2 is provided in the upper part of the refrigerator compartment 2, and is provided so that air may be discharged only to the uppermost shelf 34a in this embodiment. The refrigerator compartment return ports 15a and 15b are provided in the lower part of the refrigerator compartment 2. In this embodiment, the refrigerator compartment return port 15b is provided in the second stage (between the shelf 34c and the shelf 34d) from the bottom of the refrigerator compartment 2. The refrigerating room return port 15a is provided at the lowermost stage of the refrigerating room 2 (between the shelf 34d and the heat insulating partition wall 28) on the substantially rear surface of the internal storage room 35. As a result, when the operation rate of the R fan 9a is increased (the proportion of time during which air is blown is increased), the upper portion of the refrigerator compartment 2 having the refrigerator outlet 11a can be made relatively low in temperature. Due to the convection and heat transfer in the freezer compartment 7 through the heat insulating partition wall 28, the lower part of the refrigerator compartment 2 can be made relatively cold. Therefore, the lowermost stage provided with the storage room 35 in the lower part of the refrigerating room 2 has a structure in which the refrigerating room outlets 11a are not provided and the refrigerating room return ports 15a and 15b are provided. If the value is increased, the internal storage room 35 can be set to a relatively high temperature (temperature close to the average temperature of the refrigerator compartment 2), and if the operating rate is reduced, the internal storage room 35 is set to a relatively low temperature (refrigerator room). 2).

  The F evaporator 14b, which is a freezing evaporator, is provided in an F evaporator room 8b, which is a freezing evaporator room provided substantially at the back of the freezing room 7. The air cooled to the low temperature by exchanging heat with the F evaporator 14b is frozen by the F fan 9b, which is a refrigeration fan provided above the F evaporator 14b, via the freezer air path 12 and the freezer outlet 12a. The chamber 7 is blown to cool the inside of the freezer compartment 7. The air blown into the freezer compartment 7 returns from the freezer return port 17 to the F evaporator chamber 8b and is cooled again by the F evaporator 14b.

  In the refrigerator 1 of a present Example, the vegetable compartment 6 is also cooled with the air made into low temperature by F evaporator 14b. The air in the F evaporator chamber 8b, which has become low temperature in the F evaporator 14b, is blown to the vegetable chamber 6 by the F fan 9b via the vegetable chamber air passage (not shown) and the vegetable chamber damper (not shown). Cool the vegetable compartment 6. When the vegetable compartment 6 is cold, cooling of the vegetable compartment 6 is suppressed by closing the vegetable compartment damper. The air blown into the vegetable compartment 6 returns to the lower portion of the F evaporator chamber 8b through the vegetable compartment cold air return duct 18 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.

  The refrigerator compartment temperature sensor 41, the freezer compartment temperature sensor 42, and the vegetable compartment temperature sensor 43 are provided on the rear side of the refrigerator compartment 2, the freezer compartment 7, and the vegetable compartment 6, respectively. An F evaporator temperature sensor 40b is provided on the upper part of the oven temperature sensor 40a and the F evaporator 14b. By these sensors, the refrigerator compartment 2, the freezer compartment 7, the vegetable compartment 6, the R evaporator 14a, and the F evaporator 14b are provided. The temperature is detected. In addition, inside the door hinge cover 16 on the ceiling portion of the refrigerator 1, an outside air temperature sensor 37 that detects the temperature of outside air (outside air) and an outside air humidity sensor 38 that detects humidity are provided. As other sensors, door sensors (not shown) for detecting the open / closed states of the doors 2a, 2b, 3a, 4a, 5a, 6a, respectively, are also provided.

  As shown in FIG.2 and FIG.3, the defrost heater 21 which heats 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 is a 150 W radiant heater in this embodiment. The defrost water (melted water) generated at the time of defrosting of the F evaporator 14b falls to the F toy 23b provided at the lower part of the F evaporator chamber 8b, and the compressor 24 via the F drain port 22b and the F drain pipe 27b. It is discharged to the F evaporating dish 32b provided on the upper part.

  Moreover, although the defrosting method of R evaporator 14a is later mentioned using FIGS. 8-11, the defrost water generated at the time of defrosting of R evaporator 14a is R provided in the lower part of R evaporator chamber 8a. It falls on the toy 23a and is discharged to the R evaporating dish 32a provided in the machine room 39 via the drain port 22a and the R drain pipe 27a.

  As shown in FIG. 3, the R toy 23a is provided with a toy heater 101 that melts the defrosted water when the defrosted water in the R toy 23a is frozen. The R drain pipe 27a is provided with a drain pipe upper heater 102 and a drain pipe lower heater 103. Further, in order to control the energization of the toy heater 101, the water distribution pipe upper heater 102, and the water distribution pipe lower heater 103, a toy temperature sensor 45 for detecting the toy temperature is provided in the vicinity of the drain outlet 22a, which is the final water collecting part of the R toy 23a. It is buried inside the foam insulation. By installing the toy temperature sensor 45 inside the toy forming member without exposing the toy temperature sensor 45 to the inner surface of the R toy 23a, water does not directly contact the toy temperature sensor 45. Can be prevented, and the durability of the toy temperature sensor 45 is improved. In the refrigerator 1 of the present embodiment, the remaining water of the R toy 23a is detected by the toy temperature sensor 45 by the control described later, and the water overflows from the R toy 23a when the maximum water amount is exceeded and water enters the refrigerator compartment 2. There is no such thing. Further, by embedding the toy temperature sensor 45 in the foam heat insulating material, the unevenness of the inner surface of the R toy 23a can be reduced, and residual water in the uneven portion can be prevented. As a result of preventing the remaining water, the inside of the R toy 23a can be prevented from overflowing due to freezing of the remaining water without increasing the output of the toy heater 101 to prevent freezing of the remaining water. In addition, the toy temperature sensor 45 is embedded at a location facing the water via the R toy 23a with an amount of water that is less than half of the maximum amount of water that can be received by the R toy 23a. As a result, when water remains in the R toy 23a, the remaining water in the R toy 23a can be detected before the amount of water exceeds the maximum water amount and overflows from the R toy 23a. Can be prevented. Furthermore, in this embodiment, the toy temperature sensor 45 is disposed in the vicinity of the drain port 22a of the R toy 23a (within 10 cm affected by heat), and when the drain port 22a is frozen and cannot drain, The configuration allows early detection. Each of the heaters 101, 102, 103 is, for example, an electric heater that consumes less than 20W and consumes less power than the defrost heater 21, and in this embodiment, the toy heater 101 is 10W, the drain pipe upper heater 102 is 5W, The lower pipe heater 103 is a 3 W heater.

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

  The upper part of the R drain pipe 27a is provided facing downward while being inclined outwardly from the drain port 22a toward the outer box 10a so as to be separated from the freezer compartment 7 and the F evaporator compartment 8b. An upper tube heater 102 is provided. The lower R drain pipe 27 a is provided in the vicinity of the outer box 10 a, and the drain pipe lower heater 103 is provided up to the lower end of the heat insulating partition wall 29. The lower portion (lower than the heat insulating partition wall 29) of the R drain pipe 27a is inclined inward so that the defrost water is discharged to the R evaporating dish 32a. In this embodiment, the drain pipe upper heater 102 and the drain pipe lower heater 103 are both fixed to the R drain pipe 27a by an aluminum seal which is a heat transfer member having a high thermal conductivity. The parts that are not touched directly can be heated by heat conduction with an aluminum seal.

  By disposing the drain pipe upper heater 102 and the drain pipe lower heater 103 as described above, the upper ends of the drain pipe upper heater 102 and the drain 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 inside of the R drain pipe 27a has a negative temperature, and the defrost water is frozen 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, it is possible to melt even when water is frozen in the drain pipe, that is, from the R drain pipe 27a to the R evaporating dish 32a (see FIG. 3). ) Can be drained.

  Furthermore, the upper end of the drain pipe upper heater 102 is provided 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 equal to or lower than the lower end of the range 202. It is provided to become. The heat insulating partition wall 28 and the heat insulating partition wall 29 are in contact with the freezer compartment 7 and the F evaporator chamber 8b in the freezing temperature zone, and at least a part of the heat insulating partition wall 28 and the heat insulating partition wall 29 has a negative temperature. Accordingly, there is a possibility that 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 to a range equal to or higher than the range 202. By providing 103, the water can be discharged from the R drain pipe 27a to the R evaporating dish 32a (see FIG. 3) more reliably. In addition, since the location inside the heat insulation partition wall 28 of the R drain pipe 27a is easily cooled by the heat insulation partition wall 28, it is particularly effective to provide the drain pipe upper heater 102 at this location.

  Here, as shown in FIGS. 2 and 3, the R toy 23a is configured such that when the R fan 9a is driven, return air flows from the refrigerating chamber 2 to the refrigerating chamber evaporator 14a. Since the R fan 9a is driven during the defrosting operation of the R evaporator 14a described later, the R toy 23a can be heated by the return air of the refrigerator compartment 2. Thereby, freezing of the defrost water in R toy 23a is suppressed, and also when it freezes, the heating amount of toy heater 101 required for melting | dissolving can be suppressed, and energy saving performance can be improved.

  Further, the lower part of the drain pipe 27a (where the drain pipe lower heater 103 is provided) is closer to the outer box 10a than the freezer compartment 7 and the F evaporator room 8b. Thereby, especially when the outside air is hot, it can be heated by the outside air through the outer box 10a. Therefore, freezing at the lower part of the drain pipe 27a can be suppressed, and even when frozen, the heating amount of the drain pipe lower heater 103 can be suppressed. Energy saving performance can be improved. On the other hand, when the outside air is at a low temperature, the drain pipe lower heater 103 is heated so that the defrost water can be surely discharged. Further, as will be described later with reference to FIG. 14, since the defrosted water at about 0 ° C. flows through the R drain pipe 27a, the outer box 10a adjacent to the R drain pipe 27a is cooled by the defrost water and is lower than the dew point temperature. However, dew condensation on the outer box 10a can be suppressed by energizing the drain pipe lower heater 103.

  On the upper part of the refrigerator 1 (see FIG. 2), a control board 31 on which a CPU, a memory such as a ROM and a RAM, an interface circuit, etc., which are a part of the control device are mounted. The control board 31 is connected to the outside air temperature sensor 37, the outside air humidity sensor 38, the refrigerator compartment temperature sensor 41, the freezer compartment temperature sensor 42, the vegetable compartment temperature sensor 43, the evaporator temperature sensors 40a and 40b, the toy temperature sensor 45, and the like. The CPU described above is based on these output values, the setting of the operation unit 26, a program recorded in the ROM in advance, and the like, the compressor 24, the R fan 9a, the refrigeration fan 9b, and the heaters 21 and 101 described above. , 102, 103, and control of the refrigerant control valve 52 described later.

  FIG. 5 is a view of the inside of the heat insulating partition wall 28 as viewed from below, and shows the locations where the toy heater 101 and the toy temperature sensor 45 are disposed. The toy heater 101 is attached to the foam heat insulating material side on the back of the toy by an aluminum sheet 104 as a heat transfer member. By using aluminum with high thermal conductivity, the portion where the heater wire is not in direct contact can be heated by heat conduction by the aluminum seal. The aluminum sheet 104 is separated so as not to contact the toy temperature sensor 45. This is to prevent the toy temperature sensor 45 from being directly heated by the temperature rise of the toy heater 101 and inaccurate temperature detection of the R toy 23a.

  FIG. 6 is a circuit diagram illustrating electric heater wiring in the refrigerator according to 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 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. it can. On the other hand, the drain pipe upper heater 102 is connected to the pins P 2 and P 4 of the control board 31 similarly to the toy heater 101, and is configured to be driven in synchronization with the toy heater 21.

  FIG. 7 is a refrigeration cycle (refrigerant flow path) of the refrigerator according to the first embodiment. In the refrigerator 1 of the present embodiment, the compressor 24, the dew condensation prevention that suppresses the dew condensation on the front portions of the external heat sink 50a and the wall surface heat radiation pipe 50b, and the partition walls 28, 29, and 30 that are heat radiation means for radiating the refrigerant. The piping 50c, the refrigeration capillary tube 53a and the freezing capillary tube 53b, which are decompression means for decompressing the refrigerant, the R evaporator 14a and the F evaporator that absorb heat from the refrigerant by exchanging heat between the refrigerant and the air in the warehouse. 14b is provided and the inside is cooled by these. In addition, a dryer 51 for removing moisture in the refrigeration cycle, gas-liquid separators 54a and 54b for preventing liquid refrigerant from flowing into the compressor 24, a three-way valve 52 for controlling the refrigerant flow path, and a check The refrigerant | coolant merge part 55 which connects the valve 56 and a refrigerant | coolant flow is also provided, and the refrigerating cycle is comprised by connecting these by refrigerant | coolant piping.

  In addition, the refrigerator 1 of a present Example uses the isobutane of a combustible refrigerant | coolant as a refrigerant | coolant. Further, the compressor 24 of this embodiment includes an inverter and can change the rotation speed.

  The three-way valve 52 includes two outflow ports indicated by 52a and 52b, and includes a refrigeration mode in which the refrigerant flows in the outflow port 52a and a refrigeration mode in which the refrigerant flows in the outflow port 52b. is there. In addition, the three-way valve 52 of this embodiment also has a fully closed mode in which the refrigerant does not flow in both the outlet 52a and the outlet 52b, and a fully opened mode in which both the refrigerant flows. Is possible.

  In the refrigerator 1 of the present embodiment, the refrigerant flows as follows. The refrigerant discharged from the compressor 24 flows in the order of the external heat radiator 50a, the external heat 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 refrigeration capillary tube 53a via a refrigerant pipe, and the outlet 52b is connected to the refrigeration capillary tube 53b via a refrigerant pipe.

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

  When the refrigerant flows through the three-way valve 52 toward the outlet 52b, the refrigerant flowing out of the outlet 52b is refrigerated capillary tube 53b, F evaporator 14b, gas-liquid separator 54b, check valve 56, After flowing in the order of the refrigerant merging portion 55, the flow 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. When the refrigerant having a low pressure and low temperature in the freezing capillary tube 53b flows through the F evaporator 14b, 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 can be cooled. .

  FIG. 8 is an example of a time chart showing cooling operation control in the refrigerator of the first embodiment. Here, the storage room 35 is in a chilled mode, and the outside air is relatively high temperature (for example, 32 ° C.) and is not low humidity (for example, 60% RH). FIG. 9 is a control flowchart regarding refrigeration operation in the refrigerator of the first embodiment.

Time t ₀ is the time when the refrigerating operation for cooling the refrigerating chamber 2 is started. In this embodiment, after the refrigeration operation is completed (control S-1), a refrigeration operation execution determination (control S-3 to S-5) and a refrigerant recovery operation (control S-6) described later are performed, and then the control S- The refrigeration operation shown in FIG. In the refrigeration operation, the three-way valve 52 is set to the outlet 52a side, the compressor 24 is driven, the refrigerant is caused to flow through the R evaporator 14a, and the R evaporator 14a is cooled. By operating the R fan 9a in this state, the refrigerator compartment 2 is cooled by air that has passed through the R evaporator 14a and has become low temperature. Here, the temperature of the R evaporator 14a during the refrigeration operation is higher than that of the F evaporator 14b during the freezing operation described later. In general, the higher the temperature of the evaporator, the higher the COP (ratio of the amount of heat to be cooled with respect to the input of the compressor 24), and the higher the energy saving performance. Therefore, when cooling the refrigerator compartment 2 that can be cooled even at a high evaporator temperature, the temperature of the evaporator is increased to improve the energy saving performance as compared with the freezer compartment 7 where the evaporator temperature needs to be lowered. In the refrigerator 1 of the present embodiment, the rotational speed of the compressor 24 during the refrigeration operation is set to a lower speed (L) than during the refrigeration operation so that the temperature of the R evaporator 14a during the refrigeration operation becomes higher.

The refrigerating room 2 is cooled by the refrigerating operation, and the refrigerating room temperature detected by the refrigerating room temperature sensor 42 is lowered to T _Roff (control S-8; time t ₁ ), which satisfies the freezing operation execution condition (control S-9). Then, the refrigerant operation is switched to the refrigerant recovery operation (control S-10). In the refrigerant recovery operation, the compressor 24 is driven with the three-way valve 52 fully closed, and the refrigerant in the R evaporator 14a is recovered. Thereby, the refrigerant shortage in the next freezing operation is suppressed. Further, during the recovery of the refrigerant before the freezing operation, an R first defrosting operation (control S-18) described later is basically performed, that is, the R fan 9a is driven. As a result, the residual refrigerant in the R evaporator 14a can be used for cooling the refrigerator compartment 2, and the refrigerant in the R evaporator 14a evaporates and easily reaches the compressor 24, so that a large amount of refrigerant can be obtained in a relatively short time. Since it can collect | recover, cooling efficiency can be improved.

When the refrigerant recovery operation ends (time t ₂ ), the operation is switched to the freezing operation for cooling the freezer compartment 7. In the freezing operation, the three-way valve 52 is set to the outlet 52b side, the refrigerant is flowed to the F evaporator 14b, and the F evaporator 14b is cooled. Further, the rotational speed of the compressor 24 is set to a higher speed (H) than during the refrigeration operation. By operating the F fan 9b in this state, the freezer compartment 7 is cooled by the air passing through the F evaporator 14b and having a low temperature. This freezing operation is performed until the freezer temperature detected by the freezer temperature sensor 41 reaches T _Foff (time t ₅ ). During the freezing operation, the vegetable compartment damper (not shown) is also opened, and the vegetable compartment 6 is cooled until the vegetable compartment temperature detected by the vegetable compartment temperature sensor 43 becomes T _Roff (time t ₃ ).

  Furthermore, in the refrigerator 1 of the present embodiment, after completion of the refrigeration operation, if the R first defrosting operation execution determination (controls S-14 and S-16) is satisfied, the refrigerant of the R evaporator 14a is recovered during the refrigerant recovery and freezing operation. A first defrosting operation (hereinafter, R first defrosting operation, controls S-18 to S-20) is performed. The R first defrosting operation is performed by driving the R fan 9a and circulating air between the air in the refrigerator compartment 2 and the R evaporator 14a. This R first defrosting operation is performed mainly for two purposes.

  The first purpose is to cool the refrigerating chamber 2 by frost adhering to the R evaporator 14a and the R evaporator 14a that have become low temperature during the refrigeration operation, and thereby improve energy saving performance. During the refrigerant recovery operation and the refrigeration operation, the refrigerant cannot flow through the R evaporator 14a, but the refrigerator compartment 2 can be cooled by cooling with frost attached to the R evaporator 14a and the R evaporator 14a. In particular, when the frost adhering to the R evaporator 14a is 0 ° C. or less, the refrigerator compartment 2 can be cooled using the melting heat of the frost, and the refrigerator compartment 2 is maintained at a low temperature (suppressing the temperature rise). Can do. Since the refrigeration operation can be carried out over a relatively long time by suppressing the temperature rise in the refrigerator compartment 2, the rotational speed of the compressor 24 during the refrigeration operation can be made relatively low, and the energy saving performance can be improved. .

  The second purpose is to control the temperature distribution in the refrigerator compartment 2, and in particular to control the temperature of the internal storage compartment 35. If the R fan 9a is not operated, the upper part of the refrigerator compartment 2 becomes relatively high and the lower part becomes relatively low due to natural convection. In addition, in particular, since the internal storage chamber 35 is cooled to the freezer compartment 7 through the heat insulating partition wall 28, the internal storage chamber 35 provided in the lower part of the refrigerator compartment 2 does not operate the R fan 9a. Relatively low temperature. Therefore, in the ice temperature mode in which the internal storage chamber 35 is cooled, the R first defrosting operation is performed only once every three times (controls S-14 to S-16). Since the R fan 9a is stopped and the time during which natural convection is generated becomes longer, the internal storage room 35 provided in the lower part of the refrigerating room 2 can be made cooler than the average temperature in the refrigerating room 2, that is, ice. The temperature condition of the temperature mode can be satisfied. On the other hand, when the internal storage chamber 35 is set to a relatively high chilled mode, the R first defrosting is performed every time after the refrigeration operation in order to make the temperature close to the average temperature in the refrigerator compartment 2, that is, the R fan 9a. Is operated, and the internal storage chamber 35 is heated by the air in the refrigerator compartment 2. Thereby, it can control to comparatively high temperature, suppressing the heating by the heater (not shown) in the heat insulation partition wall 28, and can improve energy saving performance. That is, without providing a dedicated damper, it is possible to switch the temperature of the internal storage chamber 35 provided inside the refrigerator compartment 2, and to suppress the heating by the heater, resulting in a refrigerator with high energy saving performance. The frequency of performing the first R defrosting operation in the chilled mode and the ice temperature mode is not limited to the above (every chilled time and once every three times of the ice temperature), and the chilled mode is more in comparison with the ice temperature mode. The above-mentioned effect can be obtained by carrying out with high frequency. Moreover, this effect (temperature distribution control in the refrigerator compartment 2) is not limited to the refrigerator provided with the R evaporator 14a. For example, instead of the R fan 9a, a circulation fan that circulates the air in the refrigerator compartment 2 is used. It is possible to obtain the same effect by driving the circulation fan. On the other hand, as described in the present embodiment, the R evaporator 14a is provided, and the R fan 9a that blows air between the R evaporator 14a and the refrigerator compartment 2 is used, so that the R evaporator 14a and the R fan 9a are provided. Also, the effects described below can be obtained.

  The above is the main purpose of the R first defrosting operation. In addition, the R evaporator 14a and its surroundings can be heated by this operation, and the following effects are also obtained. During the refrigerant recovery operation and the refrigeration operation indicated by the controls S-10 and S-11, the refrigerant is prevented from flowing into the R evaporator 14a. Therefore, when the air in the refrigerator compartment 2 passes through the R evaporator 14a, the R evaporation is performed. The frost attached to the R evaporator 14a and the R evaporator 14a is heated by heat exchange with the refrigerator compartment 2 having a temperature higher than that of the container 14a. As a result, the frost attached to the R evaporator 14a can be melted without using a heater, the frost is discharged, or the frost is once melted to become ice to increase the density and the thermal conductivity. The increase in ventilation resistance and the decrease in heat transfer efficiency of 14a can be suppressed. That is, the cooling efficiency can be increased and the energy saving performance can be improved. Moreover, the effect of shortening the time of R 2nd defrost mentioned later is also acquired by discharging | emitting a part or all of frost during cooling operation.

This R first defrosting operation _ends when the refrigeration evaporator temperature detected by the refrigeration evaporator temperature sensor 40a _reaches T _{DRoff of} 0 ° C. or higher (control S-19; time t ₄ ) (control S-20). ) This is because the frost of the R evaporator 14a is thawed and the refrigerator compartment 2 cannot be cooled using the heat of melting of the frost, and it is judged that it is more effective for energy saving performance to suppress the power consumption for operating the R fan 9a. This is because. In addition, after the R first defrosting operation is completed, the R fan 9a may be further extended to operate the temperature distribution in the refrigerator compartment 2 (second purpose). In particular, when a temperature sensor dedicated to the internal storage room 35 is provided and it is determined that the internal storage room 35 is cooler than the target temperature, the operation of the R fan 9a is extended or re-driven to perform refrigeration. By heating with the return air of the chamber 2, the internal storage chamber 35 can be controlled to an appropriate temperature while suppressing the heating by the heater in the heat insulating partition wall 28.

When the end conditions of both the R first defrosting operation and the refrigeration operation are satisfied (time t ₅ ), the refrigerant recovery operation (control S-6) is performed in which the compressor 24 is driven again with the three-way valve 52 fully closed, The refrigerant in the F evaporator 14b is recovered, and the shortage of refrigerant in the next refrigeration operation is suppressed. At this time, the F fan 9b is driven so that the residual refrigerant in the F evaporator 14b can be used for cooling the freezer compartment 7, and the refrigerant in the F evaporator 14b evaporates to reach the compressor 24. Since a large amount of refrigerant can be recovered in a relatively short time, the cooling efficiency can be increased.

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 the present embodiment and the first defrosting control of the R evaporator 14a. By these operations, the refrigerator compartment 2, the freezer compartment 7, and the vegetable compartment 6 are cooled and maintained at a predetermined temperature, and the frost growth of the R evaporator 14a is suppressed.

Here, conditions are provided for switching (time t ₅ ) from the refrigeration operation to the refrigeration operation (more precisely, refrigerant recovery before the refrigeration operation). As described above, the present embodiment shifts to the refrigeration operation, but the determination of the controls S-3 to S-5 is performed before the start of the refrigeration operation. First, it is determined whether the R first defrosting operation and the end condition of the R second defrosting operation described later in FIG. When the refrigeration operation is finished before the R first defrosting operation and the R second defrosting operation are finished, the compressor 24 is turned off while continuing the R first defrosting operation and the R second defrosting operation. (Control S-3 or S-4 → Control S-9 {NO at the end of the freezing operation} → Control S-13). During the R first defrosting operation, the temperature of the R evaporator 14a is relatively low (T _DR <T _DRoff ) so that the refrigerator compartment 2 can be cooled. _Therefore , the compressor 24 is stopped to improve the energy saving performance. In addition, the R second defrosting operation to be described later is for the purpose of discharging the frost attached to the R evaporator 14a to the outside of the warehouse, in order to prevent the defrosted water being melted from being cooled again and refreezing, Even during the R second defrosting operation, the refrigeration operation in which the refrigerant flows through the R evaporator 14a is prohibited. Thereby, defrosting of R evaporator 14a can be performed more reliably.

In addition, as shown in control S-5, refrigerating operation also during the freezing operation ends refrigerating compartment temperature _{T R} (time _{t 5} in FIG. 8) is lower than a predetermined value _{T R_start2} (e.g. _{T R_start2 = T ROFF + 1 ℃} ) And the compressor 24 is turned off. Similarly, at the end of the refrigeration operation (time t _{1 in} FIG. 8), the compressor 24 is turned off when the freezer temperature is lower or lower than a predetermined value (for example, T _FOFF + 1 ° C.). Thereby, the excessive cooling in a store | warehouse | chamber can be suppressed.

Incidentally, the start of the refrigerating operation, the freezing operation ends (control S-1) not only, if the refrigerating compartment temperature _{T R} in the compressor 24 is stopped reaches the _{T R_start} (≧ _{T R_start2)} (control S-2) Also implement. Thereby, when the freezer compartment 7 is fully cooled, it is suppressing that the refrigerator compartment 2 becomes high temperature. Although not shown, similarly, the freezing operation is started not only at the end of the refrigerating operation, but also when the temperature of the freezer compartment 7 exceeds a predetermined value.

  Next, defrosting control of the refrigerator will be described. FIG. 10 is an example of a time chart showing the RF defrosting operation control in the refrigerator of the first embodiment. Here, the case where the outside air is relatively high temperature (for example, 32 ° C.) and not high humidity (for example, 60% RH) is shown. FIG. 11 is a control flowchart regarding the RF defrosting operation in the refrigerator of the first embodiment. The RF defrosting operation is an operation for performing defrosting of both the R evaporator 14a and the F evaporator 14b.

In the refrigerator 1 of this embodiment, during the cooling operation (control S2-1) described with reference to FIGS. 8 and 9, for example, the number of times the doors 2a, 2b, 3a, 4a, 5a, and 6a are opened and closed, and the total drive of the compressor 24 The start of the defrosting operation is determined from the time or the like (control S2-2). When the start condition is satisfied (time _td0 ), the refrigerator 1 of the present embodiment performs the refrigeration operation and the R first defrosting operation (control S2-3). By performing the freezing operation, melting of frozen food, ice, and the like due to a temperature increase in the freezer compartment 7 during the RF defrosting operation is suppressed. Further, during this time, 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 doing so.

After this refrigeration operation is performed for a predetermined time, for example, 30 minutes (time t _d1 ), the refrigerator 1 of this embodiment fully closes the three-way valve 52, the compressor 24 is turned off, the refrigeration fan 9a is turned on, and the refrigeration fan It shifts to RF defrosting operation (control S2-4) in which 9b is turned off and each heater 21, 101, 102, 103 is turned on. In the RF defrosting operation, the defrosting operation (hereinafter referred to as F defrosting operation) of the F evaporator 14b shown in the control S2-5 to S2-8 and the second removal of the R evaporator 14a shown in the control S2-11 to S2-20. A frost operation (hereinafter, R second defrost operation) is performed.

First, control related to the F defrosting operation will be described. By turning off the compressor 24 and the F fan 9b and turning on the defrost heater 21, the frost attached to the F evaporator 14b and the F evaporator 14b is heated by the defrost heater 21, and the temperature gradually rises. When the melting temperature (0 ° C.) or higher is reached, the frost attached to the F evaporator 14b is melted. When the refrigeration evaporator temperature detected by the refrigeration evaporator temperature sensor 40b becomes T _DF (eg, 10 ° C.) sufficiently higher than the frost melting temperature (control S2-5; time t _d4 ), the F defrosting operation is performed. And defrost heater 21 is turned off (control S2-6). Thereby, the F evaporator 14b is defrosted. After completion of the F defrosting operation, for example, the drainage time is stopped for 3 minutes (control S2-7), and then the refrigeration operation (control S2-8) is started.

  Next, control related to the R second defrosting operation will be described. The energization amount of the heater during this period is shown in the table of FIG. In the table, OFF indicates that the heater is not energized, L, M, and H indicate energization, and the energization amount is L <M <H. The energization amount of the heater is controlled, for example, by changing the voltage to be applied and the energization time (duty ratio) per unit time.

As shown in the table of FIG. 14, it is changed according to the outside air temperature and the state of F defrosting. The R second defrosting operation for defrosting the R evaporator 14a with low power consumption (for example, about 20 W in total) with the toy heater 101, the drain pipe upper heater 102, the drain pipe lower heater 103, and the R fan 9a is performed by the defrost heater 21. Compared with F defrost which performs defrosting (for example, 150 W), it is a defrost excellent in energy saving performance. The R second defrosting operation is similar to the R first defrosting operation, by driving the R fan 9a and performing heat exchange with the refrigerating chamber 2 having a temperature higher than that of the R evaporator 14a while cooling the refrigerating chamber 2 R The frost adhering to the evaporator 14a and the R evaporator 14a is heated and defrosted. In addition, the R second defrosting operation performed in RF defrosting operation, Toihita 101, drain pipe upper heater 102, turns ON the discharge pipe lower heater 103 (time _t d1). As shown in the table of FIG. 14, the energization amounts of the toy heater 101 and the drain pipe upper heater 102 during the F defrosting are changed according to the outside air temperature. This is because when the outside air is at a low temperature (for example, 5 ° C.), it is difficult for the temperature of the refrigerator compartment 2 to rise, and the amount of heating of the R evaporator 14a by the air in the refrigerator compartment 2 tends to be small. This is because the heat generated by the toy heater 101 is used for heating the R evaporator 14a via the R toy 23a and air. That is, the toy heater 101 is used for heating the R evaporator 14a. Further, the drain pipe lower heater 103 changes the energization amount according to the temperature and humidity of the outside air. As shown in FIG. 3, the portion where the drain pipe lower heater 103 is provided can be heated by outside air through the outer box 10a and has a low possibility of freezing. Therefore, heating of the heater is suppressed and energy saving performance is improved. ing. On the other hand, when the temperature is relatively low, since there is little heating by the outside air, the heating amount of the drain pipe lower heater 103 is increased so that the defrost water can be discharged reliably. In addition, when the outside air is highly humid, the energization amount is increased to increase the heating amount. As described above with reference to FIG. 3, the defrosting water at about 0 ° C. flows through the R drain pipe 27a at the time of defrosting, so the outer box 10a adjacent to the R drain pipe 27a is cooled by the defrost water, and has a high humidity. In some cases, the surface of the outer box 10a may be cooler than the dew point temperature. Therefore, when the humidity is high, the energization amount of the drain pipe lower heater 103 is increased to suppress dew condensation in the outer box 10a.

When starting the R second defrosting, first refrigerating evaporator temperature is determined whether or T _DR to (control S2-12). When the refrigeration evaporator temperature T _DR becomes _{equal to} or higher than T _{DRoff of} 0 ° C. or higher (for example, 3 ° C.) (time t _d7 ), the timer A measures a predetermined time Δt _d1 (for example, 20 minutes) (control S2-13, 14). In the R second defrosting operation, the frost of the R evaporator 14a can be reliably melted and discharged by further moving Δt _d1 while the R evaporator 14a is at 0 ° C. or higher. Even if the temperature of the refrigeration evaporator temperature sensor rises due to the air that bypasses the frosting part and the frost still remains, the air of 0 ° C. or higher is at least Δt _d1 or more and the R evaporator 14a. And since it flows through the circumference | surroundings, a residual frost is suppressed and it can defrost the R evaporator 14a reliably. In addition, since air of 0 ° C. or higher can be blown to at least Δt _d1 or more to the R fan 9a or the refrigerator compartment duct 11 etc. on the downstream side of the R evaporator 14a, frost is formed at these locations. Can also thaw the frost. In particular, when frost growth occurs in the R fan 9a, the R fan 9a cannot be operated and greatly affects the cooling control. Therefore, in this configuration in which the R fan 9a is provided on the downstream side of the R evaporator 14a, the refrigeration evaporator It is effective to drive for a predetermined time even after the temperature becomes _{equal to} or higher than T _{DRoff of} 0 ° C. or higher to suppress the frost growth of the R fan 9a.

Refrigerating evaporator temperature _{T DR} becomes more _{T DRoff,} moves the timer A is a predetermined time Delta] t _d1 has elapsed (time _{t d2),} and to the heater of the stop control. In this embodiment, the R fan 9a is turned off at time _td2 in order to reduce power consumption.

First, it is confirmed that the toy temperature _TG detected by the toy temperature sensor 45 is equal to or higher than T _Goff (for example, 2 ° C.) equal to or higher than 0 ° C. (control S2-15). When the toy temperature _TG is _{equal to} or higher than T _Goff or _{equal to} or higher than T _Goff , the timer B then measures a predetermined time Δt _d2 (for example, 5 minutes) (control S2-16, 17), and then the toy heater 101 and the drainage the tube upper heater 102 to OFF (control S2-16,17,18; time _t d8). Thereafter, when a predetermined time Δt _d3 (for example, 10 minutes) longer than Δt _d2 has elapsed, the drain pipe upper heater 103 is also turned off (controls S2-19, 20). By heating at least until the toy temperature _TG becomes T _{Goff of} 0 ° C. or higher, freezing of the defrost water dripped from the R evaporator 14a to the R toy 23a can be suppressed, and when it is frozen, it can be melted and discharged. . Furthermore, the defrost water is supplied by energizing the toy heater 101 and the drain pipe upper heater 102 until Δt _d2 continues even after T _Goff or more, and by energizing the drain pipe lower heater 103 until Δt _d3 elapses. Even if there is a time delay before the water is discharged and dropped from the drain pipe 27a to the R evaporating dish 32a, the water can be reliably drained.

  When the above process ends, the R second defrosting operation ends (control S2-20). Note that as described during the F defrosting operation, the restart of the cooling operation (refrigeration operation; compressor 24 ON) is determined only by the F defrosting operation. Even after the cooling operation is resumed during the R second defrosting operation, when the R second defrosting operation continues and the toy heater 101 and the drain pipe upper heater 102 are still energized, the energization amount of these heaters is increased. (Control S2-9, 10 and FIG. 14). As a result, the cooling operation is restarted, the freezing chamber 7 and the F evaporator chamber 8b are cooled, and the R toy 23a and the R drain pipe 27a are cooled. By increasing the heating amount, the R toy 23a and the R drainage are increased. Freezing of defrost water in the pipe 27a is suppressed.

  The above is defrost control of the refrigerator 1 of a present Example.

  Here, in the refrigerator 1 of the present embodiment, two types of defrosting operations of the R evaporator 14a are provided. That is, the R first defrosting operation performed during the cooling operation control shown in FIGS. 8 and 9 and the R second defrosting operation performed during the RF defrosting operation shown in FIGS. 10 and 11 are provided. Yes.

As described with reference to FIGS. 8 and 9, the R first defrosting operation performed during the cooling operation is mainly intended to control the temperature of the refrigerator compartment 2 and improve the energy saving performance, and does not necessarily melt all frost. since it is not necessary to have to terminate the R first defrosting operation if more than T _DRoff the refrigerating evaporator temperature T _DR is 0 ℃ or more (e.g. 3 ° C.).

On the other hand, R second defrosting operation because it aims melting and discharge of R evaporator 14a and the surrounding frost that, refrigerating evaporator temperature T _DR is 0 ℃ or more (e.g. 3 ° C.) of T _DRoff above and After that, by further driving the R fan 9a by Δt _d1 , the frost of the R evaporator 14a can be surely melted, and the deterioration of the cooling performance due to the frost growth of the R evaporator 14a can be suppressed.

As described above, the refrigerator 1 of the present embodiment includes the R first defrosting operation and the R second defrosting operation, and the R second defrosting operation performs the defrosting operation for a longer time than the R first defrosting operation. We are carrying out. While increasing the efficiency of the cooling operation by the R first defrosting operation, by driving the R fan 9a for a predetermined time after the refrigeration evaporator temperature _TDR becomes 0 ° C. or more in the R second defrosting operation, The R evaporator 14a and the surrounding frost can be reliably defrosted.

The R second defrosting operation is performed together with the F defrosting. As described in FIG. 9, the refrigeration operation is not performed during the R second defrosting operation, but the time before and after the RF defrosting operation (t _d0 to t shown in FIGS. 10 and 11). _{Since d4} ) gives priority to the temperature control of the freezer compartment 7, the refrigeration operation cannot be performed regardless of whether or not the R second defrosting operation is performed. Although it is conceivable to perform the refrigeration operation during the F defrosting operation, since high power consumption is required for the defrosting heater 21, in this embodiment, the compressor 24 and the defrosting heater 21 are not energized at the same time. . Therefore, by performing the R second defrosting operation that prohibits the refrigeration operation for a longer time than the R first defrost using the section where the refrigeration operation cannot be performed, The influence on temperature control can be minimized.

  The heater control is also performed mainly by the R second defrosting operation, thereby enhancing the energy saving effect. The R first defrosting operation performed during the cooling operation is performed in a state where the freezer compartment 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 R toy 23a shown in FIG. 3 exchange heat with the adjacent freezer compartment 7 and F evaporator compartment 8b. Therefore, even if the toy heater 101 and the drain pipe upper heater 102 are heated during the R first defrosting operation, the freezer compartment 7 and the F evaporator compartment 8b are heated. Moreover, since it becomes difficult to raise the temperature of R toy 23a and R drain pipe 27a because it is cooled by freezer compartment 7 and F evaporator compartment 8b, it is necessary to increase the amount of heating more than R second defrosting operation. . Therefore, if the toy heater 101 and the drain pipe upper heater 102 are energized during the R first defrosting operation, the heater consumes a lot of power to heat the R toy 23a and the R drain pipe 27a to 0 ° C. or higher. Since the freezing chamber 7 and the F evaporator chamber 8b are heated, the amount of heat to be cooled in the freezing operation is increased, so that the energy saving performance is lowered.

  On the other hand, since the R second defrosting operation is performed during the RF defrosting operation, the cooling of the freezer compartment 7 and the F evaporator chamber 8b is suppressed as shown in FIG. In particular, the F evaporator chamber 8b is at a high temperature because it is heated to a temperature equal to or higher than ° C. Since cooling by the freezer compartment 7 and the F evaporator chamber 8b with respect to the R toy 23a and the R drain pipe 27a is suppressed, the temperature of the R toy 23a and the R drain pipe 27a is set to 0 ° C. or more with a small amount of heating, that is, the R toy 23a and The defrost water frozen at the temperature of the R drain pipe 27a can be thawed and discharged. 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 power consumption.

  In addition, the R first defrosting operation is performed during the cooling operation. For example, in this embodiment, the R second defrosting operation is performed once every about 80 minutes, and the R second defrosting operation is performed during the RF defrosting operation. Therefore, the frequency is as low as once every 12 hours to several days. When the defrost water frozen by the R toy 23a and the R drain pipe 27a is melted by heating the toy heater 101 and the drain pipe upper heater 102, in addition to the amount of heat used for melting the defrost water, the freezing chamber 7 and the F evaporation The amount of heat required to heat the R toy 23a and the R drain pipe 27a, which have become low in temperature by the chamber 8b, to 0 ° C. or higher is required. Therefore, if the frequency of melting increases, the frequency of heating the R toy 23a and the R drain pipe 27a to 0 ° C. or more increases, and the amount of heat used for heating also increases. Accordingly, the frequency of melting the defrost water is reduced, and the R defrost operation is performed by concentrating on the toy heater 101 and the drain pipe upper heater 102 and discharging the defrost water to discharge the defrost water to the upper part of the toy heater 101 and the drain pipe. The heating time of the heater 102 can be suppressed and the power consumption can be reduced.

  As described above, the heater energization control 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 R second defrosting operation is mainly performed. By energizing the toy heater 101 and the drain pipe upper heater 102 inside, it is possible to obtain a refrigerator with high energy saving performance while reliably discharging defrost water.

  In the present embodiment, the R toy 23a and the upper part of the R drain pipe 27a (the drain pipe upper heater 102 portion) are both cooled in the refrigerator 1 such as the freezer compartment 7 and the F evaporator compartment 8b. The conditions that require heating are the same, and heating is performed simultaneously (both during the R second defrosting operation). Therefore, in this embodiment, as shown in FIG. 5, the pins for controlling the toy heater 101 and the drain pipe upper heater 102 are both P2 and P4, and are shared. Thereby, the above-described effects can be obtained while suppressing the number of pins and reducing the cost of the control board 31. In addition, since it implements at the time of R 2nd defrost, the number of pins can further be reduced by using a control pin common to the defrost heater 21. However, by using another control pin as in the present embodiment and controlling it to terminate in conjunction with the R evaporator temperature sensor 40a, the toy temperature sensor 45, etc. as shown in FIG. -Unnecessary heating is suppressed because the end timing of each of the F defrosting and the R second defrosting can be freely controlled while draining. That is, the present embodiment can further improve the energy saving performance.

  On the other hand, since the lower part of the R drain pipe 27a (where the drain pipe lower heater 103 is provided) is heated by the outside air, the drain pipe lower heater 103 is energized under different conditions from the toy heater 101 and the drain pipe upper heater 102. Therefore, it is effective to control the drain pipe lower heater 103 independently.

  The table in FIG. 14 also summarizes the energization control of the drain pipe lower heater 103 during the cooling operation of this embodiment, but the drain pipe lower heater 103 of this embodiment is turned off when the humidity is relatively low. However, the drain pipe lower heater 103 is energized or increases the energization amount even when the outside air is highly humid (for example, relative humidity 80%). As described above, since the defrosted water of 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 is higher than the dew point temperature at high humidity. Since the surface of the outer box 10a may become low 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 first R defrost and the second R defrost, when the humidity is high, the second R defrost operation and the cooling operation (R first defrost) In any case (including frost), the dew condensation in the outer box 10a is more reliably suppressed by energizing the drain pipe lower heater 103.

  As described above, the R toy 23a that is mainly cooled in the refrigerator 1 and the toy heater 101 provided on the upper part of the R drain pipe 27a, the drain pipe upper heater 102, and the lower part of the R drain pipe 27a that is mainly heated by outside air. Since the drainage pipe lower heater 103 provided has different conditions for heating and conditions for changing the heating amount, it can be controlled independently using different control pins. Thereby, electricity supply of a heater can be controlled on the conditions according to each, The heating of an unnecessary heater can be suppressed and the energy saving performance can be improved, discharging | emitting defrost water reliably. In particular, the toy heater 101 has the highest power consumption among the heaters 101 to 103. Therefore, controlling the toy heater 101 independently of the drain pipe lower heater 103 is effective in improving the energy saving performance.

  In addition, in the refrigerator 1 of the present embodiment, the following control is also provided in order to prevent the R second defrosting operation from becoming excessively long while draining the R evaporator 14a more reliably. .

First, during the R second defrosting, the time is measured, and when this time is abnormally long, the energization amount of the toy heater 101, the water distribution pipe upper heater 102, and the water distribution pipe lower heater 103 is increased. ing. The timer C (control S2-11) is started at the start of the R second defrosting, and when the timer C continues for a predetermined time (for example, 2 hours), the R evaporator 14a detected by the R evaporator temperature sensor 40a conditions the state _of; (T _{G <T Goff} control S2-15) is followed by a long period of time; temperature low R Toys 23a for detecting the (control _{S2-12 T DR <T DRoff)} or Toys temperature sensor 45, the low temperature Therefore, it can be estimated that the heating amount of the R evaporator 14a is insufficient, or the R toy 23a has residual water or ice. On the other hand, by increasing the energization amount of the toy heater 101, the heating of the R evaporator 14a is assisted through the R toy 23a and air so that defrosting can be surely performed. The cause of the residual water or residual ice in the R toy 23a is considered to be that freezing cannot be performed due to icing in either the R toy 23a or the R drain pipe 27a, and the toy heater 101, the water pipe upper heater 102, and the distribution The energization amount of the water pipe lower heater 103 is increased, and the ice of the R toy 23a and the R drain pipe 27a is melted so that the water can be drained reliably. That is, by using the R evaporator temperature sensor 40a and the toy temperature sensor 45 to control the energization amount of the toy heater 101, the water distribution pipe upper heater 102, and the water distribution pipe lower heater 103, the R second defrosting operation is completed. While reducing the time required (reducing the time required to satisfy the controls S2-12 and S2-15 in FIG. 11), defrosting and drainage can be performed more reliably.

Second, the toy temperature sensor 45 is used during the cooling operation, and energization of the toy heater 101, the distribution pipe upper heater 102, and the distribution pipe lower heater 103 is performed when it is predicted that a large amount of water is accumulated in the R toy 23a. It has a control to do. FIG. 12 is a flowchart of heater control performed during the cooling operation. In addition, the setting of the storage room 35 in this case is a chilled mode. When switching from the defrosting operation to the cooling operation and starting the cooling operation (control S3-1), the timer D is first started (control S3-2), and the temperature _TG of the R toy 23a detected by the toy temperature sensor 45 is determined. Time until it becomes more than _{TG_CR of} 0 _degreeC or more (for example, 1 _degreeC ) (control S3-4) is measured. Even during the cooling operation, the R first defrosting operation is performed, so that the return air of 0 ° C. or more in the refrigerator compartment 2 flows in the vicinity of the R toy 23a, and the R toy 23a is heated and detected by the toy temperature sensor 45. The temperature _TG of the R toy 23a reaches _{TG_CR of} 0 ° C. or higher. On the other hand, if a large amount of water remains in the R toy 23a and the water is frozen, it takes time for melting, so that the temperature of the toy temperature sensor 45 is difficult to rise during the R first defrosting operation. That is, when it takes a long time for the temperature of the R toy 23a to reach _{TG_CR} that is _equal to or higher than the melting temperature (0 ° C.), it is considered that a large amount of water (ice) remains in the R toy 23a. Therefore, the _{T G} is equal to or greater than _{T G_CR,} determines that it has not accumulated a large amount of water R Toy 23a, resets the timer D, and the heater 101, 102 and 103 and OFF (control S3-5) is, If the temperature of the R toy 23a is less than _{TG_CR} and the timer D is _{equal to} or greater than Δt ₄ (for example, 12 hours) (YES in the control S3-6), a large amount of water may be frozen in the R toy 23a. The toy heater 101, the water distribution pipe upper heater 102, and the water distribution pipe lower heater 103 are energized (control S3-7) to melt and drain the water of the R toy 23a. By preliminarily melting and draining the water of the R toy 23a, it is possible to prevent the R second defrosting operation from becoming excessively long (the time until the control S2-15 in FIG. 11 is satisfied). While ensuring that the water can be drained. When the timer D reaches Δt ₄ , in addition to the energization of the heater described above, for example, residual water detection may be displayed on the operation unit 26. In the refrigerator 1 of the present embodiment, slits are provided in the refrigerator compartment return ports 15a and 15b to prevent clogging of food in the drain port 22a and the R water pipe 27a. If there is a possibility that the mouth 22a is clogged and there is residual water in the R toy 23a, display the residual water detection to the user or support to check the drain 22a at an early stage and take action before a major malfunction occurs. it can.

  Note that the above is control when the storage room 35 is set in the chilled mode, and in the refrigerator 1 of this embodiment, when the storage room 35 is set in the ice temperature mode, control using the toy heater 101 is performed. .

  13a and 13b are examples of a time chart showing heater control during the cooling operation when the ice temperature is set in the refrigerator of the first embodiment. FIG. 13a shows a case where the amount of water in the R toy 23a is small, and FIG. This is a case where the amount of water is large in 23a.

  As described above with reference to FIG. 9, the frequency of the R first defrosting is reduced when the setting of the storage chamber 35 in the ice temperature mode is lower than that in the chilled mode, and the R first defrosting operation during the cooling operation is performed. Since the frequency of detecting the amount of water by the R toy 23a using the “toy” is reduced, the amount of water is detected by energizing the toy heater 101.

First, the case where the amount of water in FIG. 13a is small will be described. Similarly to the case shown in FIG. 12, when the temperature _TG of the R toy 23a detected by the toy temperature sensor 45 falls below _{TG_CR} (time t ₁₁ ), the timer D is counted without being reset. Next, when the temperature _TG of the R toy 23a _{reaches TG_L} (eg, −2 ° C.) of 0 ° C. or less (time t ₁₂ ), the toy heater 101 is energized to heat the R toy 23a and the temperature of the R toy 23a increases. Confirm. Since this energization confirms the temperature rise, the energization amount is kept low. In water less Figure 13a, heat capacity of the heating target is small, a relatively short time at a temperature _{T G} of R Toys 23a becomes _{T G_CR} (time _{t 13),} resets the timer D. _Thereafter, a high temperature of _{T G_H} than _{T G_CR} (time _{t 14),} to OFF Toihita 101 to suppress excessive heating. Note that _{TG_H} is set to _{TG_CR} or more so that the toy heater 101 is not turned off before the timer D is reset.

Next, the case where there is much water quantity of FIG. 13b is demonstrated. Similar to Figure 13a the temperature _{T G} of R Toys 23a for detecting the Toys temperature sensor 45 is below _{T G_CR} (time _{t 21)} and starts counting the timer D, the temperature _{T G} of R Toys 23a is cold _{T G_L} (Time t ₂₂ ), the toy heater 101 is energized. Here, since the amount of water of the R toy 23a is large and is equal to or less than _{TG_L of} 0 ° C. or less, a part or all of the large amount of water is frozen and it takes time to melt. Therefore, similar to FIG. 12, R Toys 23a temperatures below _{T G_CR} time with (timer D) is Delta] t ₄ or more (time _{t 23),} is a possibility that a large amount of water in R Toys 23a are frozen Therefore, the toy heater 101, the water distribution pipe upper heater 102, and the water distribution pipe lower heater 103 are energized or the energization amount is increased to melt and drain the water of the R toy 23a. That is, the effect shown in FIG. 12 is obtained.

In this embodiment, the count of the timer D, is performed a reset _{T G_CR} only starts counting from example Toihita 101 timing falls below _{T G_L} energizing (time _{t 12, t 22), T The} count may be reset when _{G_CR} is reached, and the timer D may be stopped until _{TG_L} is reached again. In this case, while the toy heater 101 is not energized, the timer D can be suppressed from exceeding Δt ₄ . On the other hand, the control program can be made relatively simple by using the present embodiment.

  In the present embodiment, the energization control of the toy heater 101 during the cooling operation is performed by setting the internal storage chamber 35. For example, when the R first defrosting is not performed for a long time even in the chilled mode (outside air If the refrigeration operation is not performed at a low temperature), the toy heater 101 may be energized. On the other hand, as in this embodiment, by detecting the amount of water by R first defrost as much as possible, the power consumption required for the heater can be suppressed and the energy saving performance can be improved.

  Here, the control in each mode of the storage room 35 in a store | warehouse | chamber and each effect are shown. FIG. 15 summarizes the control in each mode of the storage room 35 in the first embodiment.

  As described with reference to FIG. 9, the ice temperature mode reduces the frequency of the R first defrosting compared to the chilled mode so that the lower part of the refrigerator compartment 2 is cooled by natural convection so that it is refrigerated. The temperature of the storage room 35 provided in the lower part of the chamber 2 is set lower than that of the refrigerator compartment 2. On the other hand, at the time of the chilled mode, by increasing the frequency of the R first defrost, increasing the operation rate of the R fan 9a, and heating with the air in the refrigerator compartment 2 (reducing the temperature difference from the refrigerator compartment 2), The internal storage chamber 35 is prevented from becoming excessively cold.

  Furthermore, in the refrigerator 1 of the present embodiment, the compressor 24 during the refrigeration operation is driven at a higher speed (H) in the ice temperature mode than in the chilled mode. If the compressor 24 is driven at a high speed and the R fan 9a is driven at a low speed during the refrigeration operation, the temperature of the R evaporator 14a decreases. The internal storage chamber 35 is substantially in front of the R evaporator 14a (see FIG. 2) and is cooled by the R evaporator 14a without passing through the R fan 9a. Thus, the internal storage chamber 35 can be cooled to a low temperature while suppressing the cooling of the entire refrigerator compartment 2. Furthermore, the compressor operation time is increased and the amount of cooling per hour is increased, so that the refrigeration operation time can be shortened. By shortening the time of the refrigeration operation, the time ratio during which the R fan 9a is driven can be reduced, so that the lower part in the refrigerator compartment 2 is cooled by natural convection as well as the effect of reducing the frequency of the R first defrosting described above. That is, the temperature of the internal storage chamber 35 can be made lower than that of the refrigerator compartment 2. On the other hand, in the chilled mode, by setting the compressor 24 at a low speed (L) and the R fan 9a at a high speed (H), the temperature of the R evaporator 14a is raised to increase the COP, and the R fan 9a is driven. By increasing the (operation rate), the temperature of the internal storage chamber 35 can be increased, that is, the heater heating can be suppressed, and the energy saving performance can be improved.

  As described above, in the refrigerator 1 according to the present embodiment, the temperature of the internal storage room 35 provided in the refrigerator compartment 2 can be switched without providing a dedicated damper, and heating by the heater is suppressed, thereby saving energy. It is a high refrigerator.

  Further, as described with reference to FIGS. 13a and 13b, in the ice temperature mode in which the frequency of the R first defrosting is low, the energization control of the toy heater 101 during the cooling operation is performed. That is, in the refrigerator including the R evaporator 14a and the R toy 23a, the water amount of the R toy 23a can be detected at both the chilled setting and the ice temperature setting.

  The above is an example showing this embodiment. In addition, this invention is not limited to the Example mentioned above, 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. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigeration room 2a, 2b Refrigeration room door 3 Ice making room 4 Upper stage freezing room 5 Lower stage freezing room Freezing room 3a, 4a, 5a Freezing room door 6 Vegetable room 6a Vegetable room door 7 Freezing room (generic name of 3, 4, 5) )
8a R evaporator room (refrigerator evaporator room)
8b F evaporator room (freezer evaporator room)
9a R fan (refrigeration fan)
9b F fan (refrigeration fan)
DESCRIPTION OF SYMBOLS 10 Heat insulation box 10a Outer box 10b Inner box 11 Refrigeration room air path 11a Refrigeration room air outlet 12 Freezer room air path 12a Freezer room outlet 14a R evaporator (refrigerator evaporator)
14b F evaporator (refrigerator evaporator)
15a, b Refrigeration room return port 16 Hinge cover 17 Freezing room return port 18 Vegetable room return air channel 18a Vegetable room return port 21 Radiant heaters 22a, 22b Drain port 23a R toy 23b F toy 24 Compressor 27a R Drain pipe 27b F drain Pipes 28, 29, 30 Insulating partition wall 31 Control board 32a R evaporating dish 32b F evaporating dish 34a R shelf uppermost stage 34b R shelf second stage 34c R shelf third stage 34d R shelf lowermost stage 35 Storage room 39 Machine room 40a R evaporator temperature sensor 40b F evaporator temperature sensor 41 refrigerator compartment temperature sensor 42 freezer compartment temperature sensor 43 vegetable compartment temperature sensor 45 toy temperature sensors 50a, 50b radiator 51 dryer 52 three-way valve (refrigerant control means)
53a Capillary tube for refrigeration (pressure reduction means)
53b Capillary tube for freezing (pressure reduction means)
54b Refrigerated gas / liquid separator 54b Refrigeration gas / liquid separator 55 Refrigerant merge part 56 Check valves 57a and 57b Heat exchange part 101 Toy part heater 102 Drain pipe upper heater 103 Drain pipe lower heater P1 to P4 Pin

Claims (8)

A storage room is provided in the order of the refrigeration temperature zone chamber and the freezing temperature zone chamber from above, and a compressor, a refrigeration evaporator capable of supplying cold air to the refrigeration temperature zone chamber, and cold air to the refrigeration temperature zone chamber can be supplied. A refrigerator having a freezing evaporator, a toy for collecting water generated by the refrigeration evaporator, a temperature sensor for detecting a temperature of the toy, and a heating means for heating the toy. ,
A refrigerator, wherein the temperature sensor is provided inside the toy forming member without being exposed to the inner surface of the toy.   The refrigerator according to claim 1, wherein the temperature sensor is disposed in a foam heat insulating material near a drain outlet of the toy.   2. The refrigerator according to claim 1, wherein the temperature sensor is disposed in a foam heat insulating material at a location facing the water through the toy with a water amount equal to or less than half of the maximum water storage amount of the toy.   The refrigerator according to any one of claims 1 to 3, further comprising a heat transfer member that spreads heat of the heating unit, wherein the temperature sensor and the heat transfer member are separated from each other.   When the temperature sensor reaches a first set value that is 0 ° C. or less, energization of the heating unit is started. When the temperature sensor reaches a second set value that is 0 ° C. or more, energization of the heating unit is started. The refrigerator according to any one of claims 1 to 4, wherein the refrigerator is terminated.   Continue for the first set time that the temperature sensor is below the third set value, or until reaching the third set value after reaching the fourth set value lower than the third set value 6. The refrigerator according to claim 1, wherein when the first set time elapses, residual water is detected.   The refrigerator according to claim 6, wherein the third set value is not more than the second set value and not less than 0 ° C.   The refrigerator according to any one of claims 6 to 7, wherein when the residual water is detected, the heating means is energized or the energization amount is increased.

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