JP2016044875A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator enabling dew condensation proof with low power consumption.SOLUTION: A refrigerator includes: a compressor 20 compressing refrigerant; a heat radiation pipe increasing an ambient temperature by passing refrigerant compressed by the compressor 20; temperature sensors 24, 25, 26 detecting an in-box temperature; and an operation control unit 33 controlling the compressor 20 on the basis of detection temperatures in the temperature sensors 24, 25, 26. The refrigerator performs dew condensation prevention control with which a temperature of the heat radiation pipe is increased before stopping the compressor 20 with the operation control unit 33.SELECTED DRAWING: Figure 3

Description

  Embodiments of the present invention relate to a refrigerator.

  In the refrigerator, as a countermeasure against dew condensation in the vicinity of the opening of the cooling storage room, a heat dissipating pipe through which high-temperature gas refrigerant flows in the refrigeration cycle is installed at a location where it is desired to prevent dew condensation such as the periphery of the front opening of the refrigerator. Prevention of dew condensation is realized by setting the temperature of the peripheral edge of the opening in the refrigerator body to a temperature higher than the dew point temperature by heat conduction from the refrigerator.

  However, in the above configuration, when the compressor constituting the refrigeration cycle is in operation, dew prevention is realized because the refrigerant whose temperature has increased flows through the heat radiating pipe, but the cooling storage chamber is cooled below a predetermined temperature. If this happens, the compressor will stop operating, and if this condition continues for a long time, the high-temperature refrigerant will not flow through the heat radiating pipe for a long time, so the temperature of the heat radiating pipe will drop and the temperature at the periphery of the opening will drop to below the dew point temperature. If this happens, dew will be caused.

  As countermeasures against this problem, in order to improve the energy saving performance while realizing dew prevention, the operating temperature range (start the compressor operation under conditions where condensation easily occurs from outside information such as temperature sensor and humidity sensor) The structure which makes small the temperature difference between the internal temperature and the internal temperature which stops operation | movement of a compressor is proposed (refer patent document 1).

  However, if the operating temperature range is reduced in order to prevent dew, the operation and stop of the compressor are frequently repeated, resulting in a problem that the power consumption of the compressor increases.

JP 2014-81107 A

  The present invention has been made in consideration of the above problems, and an object thereof is to provide a refrigerator capable of realizing dew prevention with low power consumption.

  In order to achieve the above object, the refrigerator of the present embodiment detects a compressor that compresses refrigerant, a heat radiating pipe that raises the ambient temperature by passing the refrigerant compressed by the compressor, and the internal temperature of the refrigerator. A temperature sensor, an operation control unit that controls the compressor based on a temperature detected by the temperature sensor, and a refrigerator that performs dew condensation prevention control for increasing the temperature of the heat radiating pipe before the operation control unit stops the compressor .

It is a longitudinal cross-sectional view which shows schematic structure of the whole refrigerator of this embodiment. It is a schematic diagram which shows the refrigerating cycle in the refrigerator of this embodiment. It is a block diagram of the operation control mechanism of the compressor of this embodiment. It is a flowchart figure of the operating temperature width control based on the external humidity of this embodiment. It is a flowchart figure of the operating temperature width control based on the external humidity and external temperature of this embodiment. It is a timing chart figure of the operating temperature width change according to the humidity change of this embodiment, and the average temperature change of a thermal radiation pipe. It is a timing chart figure of a first embodiment. It is a timing chart figure of 2nd embodiment. It is a timing chart figure of 3rd embodiment.

(First embodiment)
Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1 showing a schematic overall configuration of the refrigerator, the refrigerator main body 1 has a heat insulating material 2c such as urethane foam in a gap between a steel plate outer box 2a and a synthetic resin inner box 2b provided by vacuum forming. Is formed of a vertically long heat insulating box 2 having a front opening and a storage space inside, and the storage space is thermally insulated into an upper refrigerated storage space and a lower refrigerated storage space.

  In a refrigerated storage space formed by a single inner box 2b, a refrigerated room 3 provided with a plurality of mounting shelves, a lower case as a storage container, and a vegetable room 4 provided with an upper case in an adjacent state up and down. It is divided and arranged.

  Below the vegetable compartment 4, an ice making chamber 5 provided with an automatic ice making device and an ice storage box and a small freezer compartment (not shown) are juxtaposed side by side through a heat insulating wall. The main freezer compartment 6 provided with the upper case is arranged to provide a frozen storage space that is cooled and held at −18 to −20 ° C.

  The front opening of each storage room is closed by an independent heat insulating door, and the front opening of the refrigerating room 3 is pivotable by a hinged refrigerating room door 3a by hinges provided on the upper and lower sides of both sides. It is supported. The vegetable compartment 4, the ice making compartment 5, the small freezer compartment, and the main freezer compartment 6 hold the storage container connected to the drawer type doors 4a, 5a, 6a, and are closed by a rail mechanism provided in the storage room. . In addition, an operation panel 7 and an outside air temperature sensor 8 are installed at the front center of the refrigerator compartment door 3a, and a humidity sensor 9 for detecting the humidity outside the refrigerator is installed at the lower front part of the refrigerator compartment door 3a.

  A refrigeration cooler 10 and a refrigeration blower 11 are disposed on the back of the refrigeration storage space that spans the refrigerator compartment 3 and the vegetable compartment 4, and the cold storage duct is provided with a cooler duct 12, a cooler cover 13, and a blower cover 14. And compartmentalized. Further, a refrigeration cooler 15 and a refrigeration blower 16 are disposed over the ice making chamber 5, the small freezer compartment, and the main freezer compartment 6 and separated from the cooling storage chamber by a cover body 17 that forms a cold air duct. Yes.

  In addition, defrosting of the refrigerator 10 for refrigeration is 0 degreeC or more of the refrigerator compartment 3 and the vegetable compartment 4 by driving the refrigerator fan 11 in the state which stopped the inflow of the refrigerant | coolant to the refrigerator 10 for refrigerators. This is done by circulating air at a temperature of.

  Further, below the refrigeration cooler 15, a defrost heater 18 and a drainage tub that receives defrost water are disposed. The refrigeration cooler 15 is defrosted by heating the refrigeration cooler 15 with radiant heat from the defrost heater 18. At this time, the melted defrost water is discharged to the outside by the drain.

  A machine chamber 19 that is recessed inward is formed outside the lower rear portion of the heat insulating box 2, and a compressor 20 and a condenser 21 that form part of the refrigeration cycle, a cooling fan 200, and an evaporating dish 22 that evaporates defrost water. Is arranged.

  Further, a control device 23 equipped with a microcomputer or the like for controlling the operation of the refrigerator is installed in the upper part of the machine room 19.

  The control device 23 includes detection signals from the outside air temperature sensor 8 and the humidity sensor 9, and detection from inside temperature sensors 24, 25, and 26 provided in the refrigerator compartment 3, the vegetable compartment 4, and the main freezer compartment 6. A signal and a detection signal from each detection switch that detects opening and closing of the doors of the refrigerator compartment 3 and the main freezer compartment 6 are input. In addition, a signal such as switching of a cooling mode by a user operation is input to the operation panel 7 installed on the front surface of the refrigerator compartment door 3a, and the compressor 20 and the refrigeration blower 11, based on a control program prepared in advance, Controls such as operation of the refrigeration blower 16 and the cooling fan 200, switching of the refrigerant to the refrigeration cooler 10 and the refrigeration cooler 15, and display on the operation panel 7 are performed.

  Next, the refrigeration cycle will be described. As shown in FIG. 2, the refrigerant is compressed by starting the compressor 20, and the refrigerant gas that has become high temperature and high pressure is guided to an evaporation pipe 27 disposed on the lower surface of the evaporation dish 22. The evaporating pipe 27 that has reached a high temperature promotes evaporation of the defrosted water accumulated in the evaporating dish 22. Further, a condenser 21 is connected to the evaporation pipe 27, and the high-temperature gas refrigerant is cooled by the condenser 21 while releasing its heat. At this time, by operating the cooling fan 200 disposed in the machine room 19, the heat radiation of the condenser 21 can be promoted by the air blowing action. The object to be cooled by the cooling fan 200 is not limited to the condenser 21, and a pipe through which the high-temperature and high-pressure refrigerant compressed by the compressor 20 flows and the compressor 20 itself are also included in the object to be cooled.

  Thereafter, the refrigerant whose temperature has been lowered by the air blowing action of the cooling fan 200 is guided to a heat radiating pipe 28a that forms part of the condenser 21 disposed on the peripheral edge of the refrigerator main body 1, and further passes through the lower part of the side of the refrigerator. A heat radiating pipe that wraps around the lower part and is arranged at a position where it is desired to prevent dew condensation, such as the back of the flange of the outer box 2a, at the periphery of the opening of each cooling storage chamber in order from the periphery of the opening of the main freezer compartment 6 positioned at the bottom. 28 flows. In addition, in the partition part of each cooling storage chamber, the heating body which continues to an opening part periphery is formed by folding the thermal radiation pipe 28 in U shape. Accordingly, during operation of the refrigeration cycle, a refrigerant having a temperature higher than room temperature flows through the heat radiating pipe 28. Therefore, the temperature of the outer box 2a in the vicinity of the heat radiating pipe 28 rises due to heat conduction, and the temperature above the dew point is maintained. Realize dew protection.

  The refrigerant that has passed through the heat radiating pipe 28 is guided to a three-way valve 29 located in the machine room 19, and the refrigerant flows to the refrigeration capillary tube 30 and the freezing capillary tube 31 by the three-way valve 29 based on a command from the control device 23. Switch the road. The refrigerant that has been depressurized by passing through the capillary tube and turned into a liquid is directed to the respective coolers of the refrigeration cooler 10 and the refrigeration cooler 15 disposed on the back of the refrigerator, and is vaporized by the cooler. The refrigeration and refrigeration coolers 10 and 15 are cooled by the heat of vaporization to generate cold air and cool the cooling chamber. The refrigerant becomes a gas by this heat exchange. Thereafter, the gas refrigerant that has passed through the cooler is again sucked into the compressor 20 through the suction pipe 32, and a series of refrigeration cycles is repeated.

  Next, the cooling operation control mechanism will be described. FIG. 3 is a block diagram of the operation control mechanism of the compressor 20. The control device 23 includes an operation control unit 33 that controls the operation of the compressor 20, and a cooling target in the refrigerator compartment 3 or the main freezer compartment 6. An operating temperature range control unit 34 that changes and controls the operating temperature range set for the temperature from information on the outside humidity or both the outside humidity and the outside air temperature, and a storage unit 35 that stores the operating temperature range. ing.

  Further, the inside temperature sensors 24, 25 and 26, the outside air temperature sensor 8 and the humidity sensor 9 are connected to the control device 23, and each detection signal is sent, and the compressor 20 which is a control target is connected.

  The compressor 20 is controlled by the operation control unit 33 based on the operating temperature range stored in the storage unit 35. That is, when the inside temperature of the refrigerator compartment 3 reaches the ON point that is the upper limit of the set operating temperature range, the compressor 20 is driven to cool the inside of the refrigerator compartment 3 by the refrigerator 10 for refrigeration. Refrigeration cooling is stopped when the internal temperature of the chamber reaches the off point which is the lower limit of the operating temperature range. Similarly, when the internal temperature of the main freezer compartment 6 reaches the ON point which is the upper limit of the set operating temperature range, the compressor 20 is driven to cool the inside of the main freezer compartment 6 by the freezer cooler 15, When the internal temperature of the main freezer compartment 6 reaches the off point which is the lower limit of the operating temperature range, the freezing and cooling are stopped. The compressor 20 is operated so that the inside temperature of the refrigerator compartment 3 and the main freezer compartment 6 falls within the operating temperature range. When both chambers do not require cooling, the compressor 20 is stopped and the inside of the cooling storage compartment is stored. Operation control is performed so that the temperature is maintained within a target temperature range.

  For example, when the cooling target temperature in the refrigerator compartment 3 is 2 ° C. and the set operating temperature range is ± 1 ° C., the operating temperature range for operation control is 1 ° C. to 3 ° C. Accordingly, when the internal temperature reaches 3 ° C., which is the upper limit of the operating temperature, the compressor 20 is driven by the operation control unit 33, and the cooling operation is continued until it reaches 1 ° C., which is the lower limit of the operating temperature.

  Similarly, when the target cooling temperature in the main freezer compartment 6 is −20 ° C. and the set operating temperature range is ± 2 ° C., the operating temperature range for operation control is −22 ° C. to −18 ° C. Therefore, when the internal temperature reaches −18 ° C., which is the upper limit of the operating temperature, the operation controller 33 drives the compressor 20 and the cooling operation is continued until it reaches −22 ° C., which is the lower limit of the operating temperature.

  The operation temperature range change control by the operation temperature range control unit 34 is such that the operating temperature range is set smaller as the temperature and humidity outside the chamber are likely to cause a dew phenomenon, and the operating temperature range is set lower as the temperature and humidity are lower. Set larger.

FIG. 4 is a flowchart of operating temperature width control based on outside humidity. However, W ₁ <W ₂ in FIG. In the present embodiment, control is performed so as to change the value of the operating temperature range according to the humidity outside the refrigerator. That is, when the outside humidity detected by the humidity sensor 9 is higher than the preset humidity, the outer surface of the outer box 2a is likely to be exposed, so the operating temperature range is set to be small. On the other hand, when the outside humidity is lower than the set value, it is difficult to cause dew, so the operating temperature range is set large.

FIG. 5 is a flowchart of the operating temperature range control based on the outside humidity and the outside air temperature, and, as in FIG. 4, there is a relationship of W ₁ <W ₂ . As described above, the higher the outside air temperature, the greater the temperature difference from the inside temperature of the cooling storage room, and thus the easier it is to cause dew condensation. Accordingly, the operating temperature range is set large only when the outside air temperature and the outside humidity are both lower than the set value and low humidity, and the operating temperature range is set smaller when the temperature is higher or higher than the set value.

The specific numerical values corresponding to the flowcharts of FIGS. 4 and 5 are, for example, when the set humidity outside the refrigerator is 80% and the set temperature outside the refrigerator is 15 ° C., the cooling target temperature in the refrigerator compartment 3 is 2 ° C. If so, W ₁ = ± 1 ° C. and W ₂ = ± 2 ° C. If the target cooling temperature in the main freezer compartment 6 is −20 ° C., W ₁ = ± 2 ° C. and W ₂ = ± 4 ° C. However, the values of W ₁ and W ₂ shown here are merely examples, and need to be appropriately changed depending on conditions such as the performance of the refrigerator and the use environment.

FIG. 6 is a timing chart of the change in the operating temperature range according to the change in humidity and the change in the average temperature of the heat radiating pipe 28. When the humidity reaches the set value of 80%, the operating temperature range is set to be smaller from ± W ₂ to ± W ₁ . That is, when the cooling target temperature T _0, on point is the temperature at which drives the compressor 20 at inside temperature is set low from T ₀ + W ₂ to T ₀ + W _1, it stops the operation of the compressor 20 Temperature off point is is set high from T ₀ -W ₂ to T ₀ -W _1. Thereby, since the compressor 20 is driven frequently and the degree to which a high-temperature refrigerant | coolant flows through the thermal radiation pipe 28 increases, the average temperature of the thermal radiation pipe 28 rises.

  FIG. 7 is a timing chart showing the correlation between the operating frequency of the compressor 20 and the heat radiating pipe temperature. FIG. 7 is a timing chart when the room temperature is assumed to be 18 ° C. As described above, when the internal temperature detected by the internal temperature sensors 24, 25, and 26 reaches the ON point, the operation control unit 33 operates the compressor 20 to cool the interior. At this time, the operating frequency of the compressor 20 depends on the size of the load and the performance of the compressor, but is about 20 Hz in a stable operating state. Further, the refrigerant that has been compressed and increased in temperature as the compressor 20 is operating passes through the condenser 21 and then flows into the heat radiating pipe 28. Thereby, the average temperature of the heat radiating pipe 28 rises.

  In addition, the cooling fan 200 is operated along with the operation of the compressor 20 to assist heat dissipation in the condenser 21 and to prevent the compressor 20 and the high-temperature refrigerant pipe from becoming too hot. The number of rotations of the cooling fan 200 at this time depends on the performance of the cooling fan 200, but is 900 rpm when the compressor 20 is operating at 20 Hz, and when the compressor 20 is operating at 40 Hz. The rotation speed is about 1000 rpm. Note that the rotation of the cooling fan 200 is stopped in a state where the compressor 20 is not operating.

  Thereafter, when the internal temperature sensors 24, 25, 26 detect that the internal temperature has decreased to a temperature higher than the off point by a predetermined temperature t (for example, 0.5 ° C.), the operating frequency of the compressor 20 is set to a high frequency ( For example, the dew condensation prevention control is raised to 40 Hz. The operation of the compressor 20 at this high frequency is continued until the internal temperature reaches the off point, and the compressor 20 is stopped upon detecting that the internal temperature has reached the off point.

  According to the embodiment described above, the following operational effects can be obtained.

  In the refrigerator in which the heat radiating pipe 28 is disposed on the opening peripheral edge of the refrigerator front and the like to achieve dew prevention, the compressor 20 is operated at a frequency higher than the normal frequency immediately before reaching the off point and stopping the compressor 20. To do. Thereby, since a high temperature refrigerant | coolant can be flowed more in the heat radiating pipe 28 than usual, and the temperature of the location which wants to prevent dew condensation can be raised, dew condensation can be prevented reliably.

  Also, when the operating temperature range of the compressor 20 is increased, the time during which the refrigerant does not flow through the heat radiating pipe 28 will last for a long time, and although the risk of dew condensation increases, by applying the above-described invention, Since dew condensation can be prevented more reliably, the operating temperature range can be increased, and power consumption caused by switching between the operating state and the stopped state of the compressor can be suppressed.

(Second embodiment)
FIG. 8 is a timing chart showing the correlation between the rotational speed of the cooling fan 200 and the temperature of the heat radiating pipe 28. FIG. 8 is a timing chart when the room temperature is assumed to be 18 ° C. as in FIG. When the internal temperature detected by the internal temperature sensors 24, 25, and 26 reaches the ON point, the operation control unit 33 operates the compressor 20 to cool the internal space. At this time, the rotation speed of the cooling fan 200 depends on the operating frequency of the compressor 20 and the performance of the cooling fan 200, but is approximately 1000 rpm when the compressor 20 is operating at 20 Hz.

  Thereafter, when the internal temperature sensors 24, 25, and 26 detect that the internal temperature has decreased to a temperature that is higher than the off point by a predetermined temperature t (for example, 0.5 ° C.), the dew condensation prevention control that stops the rotation of the cooling fan 200 is performed. I do. The operation of the compressor 20 is continued in a state where the rotation of the cooling fan 200 is stopped, and the compressor 20 is stopped after detecting that the internal temperature has reached the off point.

  According to the embodiment described above, the following operational effects can be obtained.

  In the refrigerator in which the heat radiating pipe 28 is arranged on the peripheral edge of the opening on the front surface of the refrigerator to realize dew prevention, the cooling fan 200 is stopped immediately before reaching the off point and stopping the compressor 20. Thereby, since the temperature of the refrigerant | coolant which flows in the inside of the thermal radiation pipe 28 can be made higher than usual, and the temperature of the location which wants to prevent dew condensation can be raised, dew condensation can be prevented reliably.

  Also, when the operating temperature range of the compressor 20 is increased, the time during which the refrigerant does not flow through the heat radiating pipe 28 will last for a long time, and although the risk of dew condensation increases, by applying the above-described invention, Since dew condensation can be prevented more reliably, the operating temperature range can be increased, and power consumption caused by switching between the operating state and the stopped state of the compressor can be suppressed.

(Third embodiment)
FIG. 9 is a timing chart showing the correlation among the operating frequency of the compressor 20, the temperature of the heat radiating pipe 28, and the rotational speed of the cooling fan 200. FIG. 9 is a timing chart when the room temperature is assumed to be 18 ° C. as in FIG. When the internal temperature detected by the internal temperature sensors 24, 25, and 26 reaches the ON point, the operation control unit 33 operates the compressor 20 to cool the internal space. At this time, the rotation speed of the cooling fan 200 depends on the operating frequency of the compressor 20 and the performance of the cooling fan 200, but is approximately 1000 rpm when the compressor 20 is operating at 20 Hz.

  Thereafter, when the internal temperature sensors 24, 25, 26 detect that the internal temperature has decreased to a temperature higher than the off point by a predetermined temperature t (for example, 0.5 ° C.), the operating frequency of the compressor 20 is set to a high frequency (for example, 40 Hz) and the condensation prevention control is performed to reduce the rotational speed of the cooling fan 200 to a predetermined rotational speed (for example, 900 rpm). The operation of the compressor 20 is continued with the compressor 20 at a high frequency and the cooling fan 200 at a low speed, the compressor 20 is stopped while detecting that the internal temperature has reached the off point, and the cooling fan 200 Stop.

  According to the embodiment described above, the following operational effects can be obtained.

  In the refrigerator in which the heat radiating pipe 28 is arranged on the peripheral edge of the opening of the refrigerator to achieve dew prevention, the operating frequency of the compressor 20 is increased and the cooling fan 200 immediately before the compressor 20 is stopped after reaching the off point. Reduce the number of revolutions. Accordingly, the temperature of the refrigerant flowing in the heat radiating pipe 28 can be made higher than usual, and the amount of the flowing refrigerant can be increased. Therefore, the condensation is reliably prevented by increasing the temperature of the portion where condensation is desired to be prevented. be able to.

  Also, when the operating temperature range of the compressor 20 is increased, the time during which the refrigerant does not flow through the heat radiating pipe 28 will last for a long time, and although the risk of dew condensation increases, by applying the above-described invention, Since dew condensation can be prevented more reliably, the operating temperature range can be increased, and power consumption caused by switching between the operating state and the stopped state of the compressor can be suppressed.

  Further, by increasing the operating frequency of the compressor 20 and decreasing the rotational speed of the cooling fan 200, it is possible to increase the average temperature of the heat radiating pipe 28, thereby preventing condensation more reliably. it can.

(Fourth embodiment)
The fourth embodiment is different from the above-described embodiment in that the operating frequency of the compressor 20 and the rotation speed of the cooling fan 200 before changing the compressor 20 are changed according to the information acquired by the external information acquisition means. ing.

  As the outside air temperature measured by the outside air temperature sensor 8 is higher, the temperature difference from the inside temperature of the cooling storage chamber becomes larger, so that dew is more likely to occur. Further, the higher the humidity measured by the humidity sensor 9, the easier it is to cause dew. Therefore, the operating frequency of the compressor 20 immediately before stopping the compressor 20 is increased under conditions of high temperature or high humidity, which are conditions that are likely to cause dew. Specifically, when it is detected that the outside air temperature is higher than a predetermined temperature (for example, 30 ° C.), or when it is detected that the humidity is higher than the predetermined humidity (for example, 90%), The operating frequency immediately before stopping the compressor 20 which is the dew condensation prevention control is set to 45 Hz which is 5 Hz higher than 40 Hz.

  Similarly, the amount by which the number of revolutions of the cooling fan 200 is reduced under high temperature and high humidity conditions is increased. Specifically, when it is detected that the outside air temperature is higher than a predetermined temperature (for example, 30 ° C.), or when it is detected that the humidity is higher than the predetermined humidity (for example, 90%), Immediately before the compressor 20 is stopped, the rotation speed of the cooling fan 200 is not reduced by 100 rpm, but the rotation is stopped. Alternatively, the amount by which the number of revolutions is reduced is increased, and the speed is reduced by 200 rpm.

  Note that the operating frequency of the compressor 20, which is the dew condensation prevention control immediately before stopping the compressor 20, is set low, and the rotation speed of the cooling fan 200 is set high under conditions of low temperature or low humidity, which are conditions that hardly cause dew condensation. You may do it.

  In addition, when it is determined that the current condensation prevention control is inadequate and it is necessary to prevent condensation more reliably, such as when the user discovers that condensation has occurred in the refrigerator body 1, By operating the panel 7 and selecting the dew condensation prevention mode, the control is changed to make the temperature of the heat radiating pipe 28 higher. Specifically, the compressor 20 is operated at a frequency (for example, 50 Hz) higher than the high frequency set in the normal condensation prevention control immediately before the compressor 20 is stopped regardless of the detection result of the outside air temperature and humidity. At the same time, the condensation prevention control for stopping the cooling fan 200 is performed. Further, in the dew condensation prevention mode, the dew condensation prevention control is not performed during the period from the temperature 0.5 ° C. higher than the off point to the off point, but from the temperature 0.7 ° C. higher than the off point to the off point. It is also possible to ensure a long time for the high-temperature refrigerant to flow through the heat radiating pipe 28 by performing dew condensation prevention control in the meantime.

  According to the embodiment described above, the following operational effects can be obtained.

  Condensation prevention control is performed so that the easiness of dew condensation is determined from the detection results of the outside air temperature sensor 8 and the humidity sensor 9 which are outside-compartment information acquisition means, and the heat radiation pipe 28 is heated to a higher temperature under conditions where dew is liable to occur. Therefore, dew can be surely prevented.

  Further, since the dew condensation prevention control is performed so that the heat radiating pipe 28 does not become unnecessarily high under the conditions where it is difficult for dew condensation to occur, the power consumption can be suppressed.

  In the above description, a refrigerator that does not include dew proofing means other than the heat radiating pipe 28, that is, a refrigerator that does not include a heat radiating heater or a mechanism that controls switching of the refrigerant flow path with a valve using a bypass pipe has been described. Further, the present invention may be applied to a refrigerator provided with parts other than the heat radiating pipe 28 in addition to the heat radiating pipe 28 as dew proof means. In this case, since a plurality of dew prevention means such as control of the heat radiating heater and control of the flow rate of the refrigerant flowing through the heat radiating pipe 28 are controlled, the dew proofing accuracy can be further improved.

  As a modification, instead of determining the change control of the operating temperature range from the magnitude of the difference between the preset humidity and the actual outside humidity, calculate the dew point temperature from the outside humidity and outside air temperature information, The operating temperature range may be determined so that the location where the heat radiating pipe 28 is desired to prevent dew becomes a temperature equal to or higher than the dew point temperature.

  In addition, the refrigeration cycle is not limited to one having a plurality of coolers such as refrigeration and freezing, and may be a refrigerator having a single cooler.

  As described above, according to the refrigerator of the present embodiment, in the refrigerator in which the heat radiating pipe 28 is arranged on the peripheral edge of the opening on the front surface of the refrigerator to achieve dew condensation, the dew condensation occurs immediately before reaching the off point and stopping the compressor 20. By performing prevention control and increasing the temperature of the heat radiating pipe 28, the temperature of the heat radiating pipe 28 is less likely to be lowered to a temperature lower than the predetermined temperature even if the refrigerant does not flow thereafter for a long time. Accordingly, the temperature of the refrigerant flowing in the heat radiating pipe 28 can be made higher than usual, and the amount of the flowing refrigerant can be increased. Therefore, the condensation is reliably prevented by increasing the temperature of the portion where condensation is desired to be prevented. be able to.

  Also, when the operating temperature range of the compressor 20 is increased, the time during which the refrigerant does not flow through the heat radiating pipe 28 will last for a long time, and although the risk of dew condensation increases, by applying the above-described invention, Since dew condensation can be prevented more reliably, the operating temperature range can be increased, and power consumption caused by switching between the operating state and the stopped state of the compressor can be suppressed.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

2 is a heat insulating box, 2a is an outer box, 2b is an inner box, 2c is a heat insulating material, 8 is an outside air temperature sensor, 9 is a humidity sensor, 10 is a refrigeration cooler, 15 is a refrigeration cooler, and 20 is a compressor. , 21 is a condenser, 23 is a control device, 28 is a heat radiating pipe, 29 is a three-way valve, 30 is a refrigeration capillary tube, 31 is a freezing capillary tube, 32 is a suction pipe, 33 is an operation control unit, Reference numeral 34 denotes an operating temperature width controller, 35 denotes storage means, and 200 denotes a cooling fan.

Claims (5)

A compressor for compressing the refrigerant;
A heat radiating pipe that raises the ambient temperature by passing the refrigerant compressed by the compressor; and
A temperature sensor for detecting the internal temperature;
An operation control unit for controlling the compressor based on the temperature detected by the temperature sensor,
The refrigerator which performs the dew condensation prevention control which raises the temperature of the said heat radiating pipe before stopping the said compressor in the said operation control part.   The refrigerator according to claim 1, wherein the dew condensation prevention control is a control for increasing a rotation speed of the compressor. A cooling fan for reducing the temperature of the compressed refrigerant,
The refrigerator according to claim 1, wherein the dew condensation prevention control is a control for reducing the number of rotations of the cooling fan. Provided with outside information acquisition means for acquiring outside information,
The refrigerator in any one of Claim 1 to 3 which changes the control content in the said dew condensation prevention control according to the information acquired by the said external information acquisition means.   The refrigerator in any one of Claim 1 to 4 which can change the content of dew condensation prevention control by a user's operation.

Images