JP2014020715A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator which can improve dew-condensation proofing performance.SOLUTION: A refrigerator 10 includes an outside humidity sensor 48 that detects humidity outside a cabinet 12 of the refrigerator 10, a refrigeration cycle 60, and a main control unit 76. When the detection temperature detected by the outside humidity sensor 48 is higher than reference humidity, the main control unit 76 uses the refrigeration cycle 60 to execute a dew-condensation preventing mode which prevents dew-condensation of the refrigerator 10.

Description

  This embodiment relates to a refrigerator.

  2. Description of the Related Art Conventionally, a technique for improving dew prevention performance by mounting a humidity sensor in a refrigerator has been proposed.

  For example, as a first conventional technique, a capacitor circuit piped in a refrigerator cabinet is provided with a dew condensation prevention capacitor and a bypass capacitor that bypasses the capacitor circuit, and the ambient temperature detected by the temperature sensor and the ambient detected by the humidity sensor By comparing the humidity and the temperature of the opening / closing part of the outer box, when it is not necessary to prevent dew condensation, the dew condensation capacitor is bypassed using a detour capacitor.

  In addition, as a second prior art, a humidity sensor disposed in a partition part of a cabinet adjacent to the freezer compartment and a heating means for preventing dew are provided, and the heating means is based on the output of the humidity sensor. Control to prevent dew condensation.

JP-A-5-118730 JP-A-8-338679

  However, the first prior art has a problem that the structure is complicated and the cost becomes high, such as switching between a dew condensation prevention capacitor and a bypass capacitor.

  Further, in the second prior art, there is a problem in that it is difficult to prevent the entire refrigerator from being heated, although it is possible to prevent the heated portion by the heating means.

  Then, this embodiment aims at providing the refrigerator which can improve dewproof performance in view of the said problem.

  In the present embodiment, a humidity sensor for detecting outside humidity outside the cabinet of the refrigerator, a compressor, a condenser, a dew-proof pipe provided in the cabinet, an evaporator, and cool air from the evaporator are blown into the inside of the cabinet. A refrigeration cycle having an internal fan, a condenser fan for cooling the condenser, and a dew condensation prevention mode for preventing condensation in the refrigerator when the detected humidity detected by the humidity sensor is high, using the refrigeration cycle And a control unit.

It is a longitudinal cross-sectional view of the refrigerator of Embodiment 1. It is a figure of the refrigerating cycle of the refrigerator of Embodiment 1. FIG. It is a block diagram of the refrigerator of Embodiment 1. It is a graph which shows the relationship between relative humidity and the output voltage of an external humidity sensor. It is a graph which shows the internal temperature in the state which does not perform dew condensation prevention mode. It is a graph which shows the internal temperature of the state which performs a condensation prevention mode similarly. It is a graph which shows the relationship between the control temperature width and the amount of saturated water vapor | steam in the example of a change of Embodiment 1. It is a graph which shows the relationship between the maximum stop time of a compressor and the amount of saturated water vapor | steam in the example of a change of Embodiment 2. It is a graph which shows the relationship between the maximum frequency of a compressor and the amount of saturated water vapor | steam in the example of a change of Embodiment 3. It is a graph which shows the relationship between the rotation speed of C fan in the example of a change of Embodiment 4, and saturated water vapor | steam amount. It is a graph which shows the relationship between the rotation speed of the fan in a store | warehouse | chamber in the example of a change of Embodiment 5, and saturated water vapor amount. It is a graph which shows the start state of the dew condensation prevention mode between the relative humidity and the outside temperature of Embodiment 6. It is a graph which shows the relationship between the duty ratio of the dewproof heater of Embodiment 8, and saturated water vapor amount. It is a graph which shows the relationship between the output of the dewproof heater of Embodiment 8, and relative humidity.

  Hereinafter, the refrigerator 10 of this embodiment is demonstrated based on drawing.

Embodiment 1

  The refrigerator 10 of Embodiment 1 is demonstrated based on FIGS.

(1) Structure of refrigerator 10 The structure of the refrigerator 10 is demonstrated based on FIG. FIG. 1 is a longitudinal sectional view of the refrigerator 10 of the present embodiment.

  The cabinet 12 of the refrigerator 10 includes an outer box and an inner box, and has a heat insulating structure having a heat insulating material therebetween. The cabinet 12 is provided with a refrigerator compartment 14, a vegetable compartment 16, a small freezer compartment 18, and a large freezer compartment 20 in order from the top, and an ice making chamber (not shown) is provided beside the small compartment 18. . A heat-insulating partition 26 is provided between the vegetable compartment 16 and the small freezer compartment 18, and the refrigerator compartment 14 and the vegetable compartment 16 constitute a refrigerated space 22. From the small freezer compartment 18, the freezer compartment 20, and the ice making compartment A frozen space 24 is configured. A machine room 28 is provided on the back of the freezer compartment 20, that is, on the bottom of the cabinet 12.

  A double door 14a is provided in front of the refrigerator compartment 14, and drawer type doors 16a, 18a, 20a are provided in front of the vegetable compartment 16, the small freezer compartment 18, the ice making room, and the freezer compartment 20. .

  A refrigeration evaporator (hereinafter referred to as “R EVA”) 30 is provided at the lower back of the refrigerator compartment 14, and a refrigerator internal fan (hereinafter referred to as “R fan”) 32 is provided below the R EVA 30. Is provided. A freezing evaporator (hereinafter referred to as “F EVA”) 34 is provided on the upper rear surface of the freezer compartment 20, and a freezer compartment fan (hereinafter referred to as “F fan”) 36 is provided above the F EVA 34. Is provided.

  A compressor 38 is provided in the machine room 28, and a control board 40 of the refrigerator 10 is attached to the upper back of the machine room 24.

  An operation plate 42 for a user to operate the refrigerator 10 is provided on the front surface of the double door 14a of the refrigerator compartment 14, and an operation control unit 44 is built in the operation plate 42. On the front face of the operation plate 42, an outside temperature sensor 46 for detecting the outside temperature around the refrigerator 10 and an outside humidity sensor 48 for detecting the surrounding outside humidity are provided. A dew proof heater 58 is provided in the vertical direction at a partition between the double door left door 14a and the left door 14a.

  On the back surface of the refrigerator compartment 14, a refrigerator internal temperature sensor (hereinafter referred to as “R sensor”) 50 for detecting the internal temperature of the refrigerator compartment 14 is provided. A freezer compartment temperature sensor (hereinafter referred to as “F sensor”) 52 for detecting the inside temperature of the freezer compartment 20 is provided on the back surface of the large freezer compartment 20.

  In the defrosting operation, the refrigeration defrost sensor (hereinafter referred to as the temperature sensor for detecting the temperature when the frost adhering to the R EVA 30 is removed and the temperature rises to 3 ° C. or higher in the defrosting operation. 54 (referred to as an “R defrost sensor”) and a freezing defrost sensor (hereinafter referred to as “F defrost sensor”) 56 are also provided in the F EVA 34.

(2) Structure of refrigeration cycle 60 Next, the structure of the refrigeration cycle 60 of the refrigerator 10 will be described with reference to FIG.

  On the discharge side of the compressor 9, a condenser 62, a dewproof pipe 64, a dryer 65, and a three-way valve 66 are connected in order. A condenser fan (hereinafter referred to as “C fan”) 63 for cooling the condenser 62 is provided in the vicinity of the condenser 62. A refrigeration capillary tube (hereinafter referred to as “R capillary tube”) 68, an R evaporator 30, and an accumulator 69 are connected to one R outlet of the three-way valve. A freezing capillary tube (hereinafter referred to as “F capillary tube”) 70, an F evaporator 34, an accumulator 71, and a check valve 72 are connected to the other F outlet of the three-way valve 66. The outlet side of the check valve 72 and the outlet side of the accumulator 69 become one, and then reach the suction side of the compressor 38 via the suction pipe 74.

  In the refrigeration cycle 60, the refrigerant is compressed by the compressor 38 and changed to a high-temperature and high-pressure gaseous refrigerant, and becomes a liquid refrigerant while radiating heat through the condenser 62 and the dew-proof pipe 64. The liquid refrigerant is sent to the R capillary tube 68 or the F capillary tube 70 by the three-way valve 66, and is decompressed so as to be easily vaporized by the R capillary tube 68 or the F capillary tube 70. Or, it is vaporized by the F-evapor 34 and cool air is generated by taking heat away from the surroundings. The refrigerant deprived of heat from the surroundings flows into the accumulators 69 and 71, respectively. In each accumulator 69 and 71, the gas-liquid mixture refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, respectively. Only the refrigerant returns to the compressor 38 via the suction pipe 74 and is compressed again to become a high-temperature and high-pressure gaseous refrigerant.

(3) Electrical configuration of refrigerator 10 Next, the electrical configuration of the refrigerator 10 will be described with reference to FIG. FIG. 3 is a block diagram showing an electrical configuration of the refrigerator 10.

  The control board 40 is provided with a main control unit 76 made of a microcomputer or the like. An operation control unit 44 provided on the operation plate 42 and a motor control unit 78 provided on the compressor 38 are connected to the main control unit 76.

  An external temperature sensor 46 and an external humidity sensor 48 are connected to the operation control unit 44. The outside humidity sensor 48 is a resistance film type or electrostatic capacitance type humidity sensor and outputs the output voltage so as to increase in proportion to the temperature-corrected relative humidity value (see FIG. 4). That is, the outside humidity sensor 48 has a temperature sensor therein, and the detected humidity of the temperature sensor, the detected humidity, and the previously prepared conversion conversion table are used to correct the detected humidity to the detected temperature. The relative humidity is output.

  Connected to the main controller 76 are an R sensor 50, an F sensor 52, an R defrost sensor 54, an F defrost sensor 56, an R fan 32, an F fan 36, a C fan 63, a three-way valve 66, and a dew proof heater 58. ing.

  The motor of the compressor 38 is also inverter-controlled by a motor controller 78, and the rotational speed is variable by frequency control such as PWM control. The higher the rotational speed, the larger the supply amount of refrigerant.

  In the refrigeration cycle 60, the main control unit 76 cools the refrigerator compartment 14 and the vegetable compartment 16 (hereinafter referred to as “R mode”), and cools the small freezer compartment 18, the ice making compartment, and the large freezer compartment 20. Refrigeration operation (hereinafter referred to as “F mode”) is performed alternately. The defrosting operation is performed about once a day. In this case, when the R defrost sensor 54 and the F defrost sensor 56 reach a predetermined temperature (for example, 2 ° C.) or more, the main control unit 76 causes the R EVA 30 and F It is determined that the defrosting of the EVA 34 has been completed, and the defrosting operation is terminated.

(4) R mode and F mode Next, R mode and F mode are demonstrated.

  In the R mode, the main control unit 76 closes the F outlet of the three-way valve 66, opens the R outlet, and causes the liquid refrigerant to flow to the R EVA 30. Further, the main control unit 76 turns on the R fan 32, turns off the F fan 36, and rotates the C fan 63 at a predetermined rotational speed. The liquid refrigerant that has flowed to the R-evaporator 30 cools the R-evaporator 30, and this cooled air (cold air) is sent to the refrigerator compartment 14 and the vegetable compartment 16 by the R fan 32. With this cold air, the inside temperature of the refrigerator compartment 14 and the vegetable compartment 16 is maintained at 1 ° C to 5 ° C.

  In the F mode, the main control unit 76 closes the R outlet of the three-way valve 66, opens the F outlet, and causes the liquid refrigerant to flow to the F EVA 34. Further, the main control unit 76 turns off the R fan 32, turns on the F fan 36, and rotates the C fan 63 at a predetermined rotational speed. The liquid refrigerant that has flowed to the F-evaporator 34 cools the F-evaporator 34, and the cooled air (cold air) is sent to the ice making chamber, the small freezer compartment 18, and the large-sized freezer compartment 20 by the F fan 36. With this cold air, the inside temperatures of the ice making room, the small freezer room 18 and the freezer room 20 are maintained at -18 ° C to -26 ° C.

(5) Condensation Prevention Mode Next, the condensation prevention mode performed by the main control unit 60 performing the F mode and R mode described above based on the detected humidity detected by the outside humidity sensor 48 will be described.

(5-1) F Mode First, in the F mode, the main control unit 60 sets the freezing start temperature and the freezing end temperature. In this setting method, a refrigeration center temperature, which is the center temperature between the refrigeration start temperature and the refrigeration end temperature, is set in advance (for example, 22 ° C.), and then the refrigeration control temperature width diff is set around the refrigeration center temperature. This

Freezing start temperature = Freezing center temperature + Freezing control temperature range / 2 (1)

Freezing end temperature = Freezing center temperature−Freezing control temperature range / 2 (2)

It becomes.

  The main controller 60 stops the compressor 38 when the internal temperature detected by the F sensor 52 reaches the freezing end temperature, and starts the operation of the compressor 38 when it reaches the freezing start temperature.

  Incidentally, as shown in FIG. 4, the outside humidity sensor 48 increases the output voltage (V) in proportion to the detected relative humidity (% RH). The main controller 60 detects the relative humidity detected by the outside humidity sensor 48, and executes the dew condensation prevention mode when the detected humidity becomes equal to or higher than a reference humidity (for example, 50%). Specifically, the main control unit 60 increases the refrigeration control temperature width diff as shown in FIG. 5 when the detected humidity of the outside humidity sensor 48 is lower than the reference humidity while executing the F mode. Set (for example, 4 ° C.), set the freezing start temperature to −18 ° C., and set the freezing end temperature to −26 ° C. On the other hand, when the humidity detected by the outside humidity sensor 48 is higher than the reference humidity, the main control unit 60 sets the refrigeration control temperature width diff narrowly (for example, 2 ° C.) and starts refrigeration as shown in FIG. Set the temperature to -20 ° C and the freezing end temperature to -24 ° C.

  The reason for setting in this way is as follows. During operation of the compressor 38, since the warm refrigerant passes through the dew proof pipe 64, basically no condensation is formed on the cabinet 12. However, when the compressor 38 is stopped for a long time, the surface of the cabinet 12 is gradually cooled by cooling the inside of the cabinet, and if the installation environment of the refrigerator 10 is high temperature and high humidity, condensation is formed on the surface of the cabinet 12. Therefore, in order to prevent the compressor 38 from stopping for a long time, when the detected humidity is higher than the reference humidity (that is, when the humidity is high), the refrigeration control temperature width diff is narrowed as shown in FIG. Then, the freezing end temperature is raised and the compressor 38 is operated quickly. On the other hand, in the case of low humidity, there is little condensation on the cabinet 12, so the refrigeration control temperature width diff is increased as shown in FIG.

(5-2) R mode Next, in the R mode, the main controller 60 sets the refrigeration start temperature and the refrigeration end temperature. In this setting method, a refrigeration center temperature (for example, 2 ° C.) that is the center temperature of the refrigeration start temperature and the refrigeration end temperature is set in advance, and then the refrigeration control temperature width diff is set with the refrigeration center temperature as the center. This

Refrigeration start temperature = refrigeration center temperature + refrigeration control temperature range / 2 (3)

Refrigeration end temperature = refrigeration center temperature-refrigeration control temperature range / 2 (4)

It becomes.

  The main controller 60 stops the compressor 38 when the internal temperature detected by the R sensor 50 reaches the refrigeration end temperature, and starts the operation of the compressor 38 when it reaches the refrigeration start temperature. When the compressor 38 is stopped, the detection temperature of the F sensor 52 needs to be lower than the refrigeration end temperature, and the detection of the R sensor 50 needs to be lower than the refrigeration end temperature.

  The main control unit 60 executes the dew condensation prevention mode when the detected humidity detected by the outside humidity sensor 48 becomes equal to or higher than the reference humidity. Specifically, when the detected humidity of the outside humidity sensor 48 is lower than the reference humidity while executing the R mode, the main control unit 60 sets the refrigeration control temperature width diff widely as shown in FIG. (For example, 2 ° C.), the refrigeration start temperature is set to 0 ° C., and the refrigeration end temperature is set to 4 ° C. On the other hand, when the detected humidity of the outside humidity sensor 48 is higher than the reference humidity while executing the R mode, the main control unit 60 sets the refrigeration control temperature width diff narrowly as shown in FIG. 6 (for example, 1 ° C), the refrigeration start temperature is set to 1 ° C, and the refrigeration end temperature is set to 3 ° C.

(6) Effect In the dew condensation prevention mode of the present embodiment, when the humidity with a low possibility of dew condensation is low, the operation stop period of the compressor 38 is lengthened to suppress power consumption and the humidity is high. In order to prevent condensation, the compressor 38 is stopped for a long time.

(7) Modified Example In the above embodiment, the switching of the refrigeration control temperature width diff is switched to a two-step (wide, narrow) step shape. Instead, as shown in FIG. The relative humidity may be changed linearly (linearly) so as to become narrower as the relative humidity increases. The horizontal axis in FIG. 7 represents the saturated water vapor amount, which corresponds to the relative humidity. That is, the saturated water vapor amount is determined by the temperature, and if the temperature is low, no condensation occurs even if the relative humidity is high. Therefore, based on the relative humidity detected by the outside humidity sensor 48 and the outside temperature detected by the outside temperature sensor 46, the saturated water vapor amount is estimated, and the main control unit 60 determines the saturated water vapor amount as the outside humidity. The anti-condensation mode is executed as if The same applies to the graphs of FIGS. 7 to 11 and 13.

Embodiment 2

  Next, the dew condensation prevention mode of the refrigerator 10 according to the second embodiment will be described.

  When the compressor 38 stops, the warm refrigerant does not flow through the dew proof pipe 64, and the cabinet 12 is condensed. Therefore, in the dew condensation prevention mode of this embodiment, the maximum stop time (for example, 10 minutes) of the compressor 38 when the humidity detected by the outside humidity sensor 48 is higher than the reference humidity is set in advance for the purpose of preventing the dew condensation. Set it and do not set the maximum stop time when it is low.

  When the detected humidity is higher than the reference humidity and the stop time of the compressor 38 exceeds the maximum stop time, the main control unit 60 forcibly operates the compressor 38 and causes the dew prevention pipe 64 to warm the refrigerant. To prevent condensation in the cabinet 12.

  As a modification of the present embodiment, as shown in FIG. 8, the maximum stop time is linearly shortened as the detected humidity (saturated water vapor amount) is higher. Thereby, dew condensation can be prevented more reliably.

  Moreover, you may perform the dew condensation prevention mode of this embodiment, performing the dew condensation prevention mode in Embodiment 1. FIG.

Embodiment 3

  Next, the dew condensation prevention mode of the refrigerator 10 of Embodiment 3 is demonstrated.

  In the dew condensation prevention mode of this embodiment, the normal value of the maximum frequency representing the maximum rotation speed of the compressor 38 is 60 to 80 Hz, but when the dew condensation prevention mode is executed, the maximum frequency is reduced to 30 to 50 Hz. Let That is, when the detected humidity is higher than the reference humidity, it is difficult to reach the cooling end temperature in the R mode or the F mode by suppressing the maximum frequency of the compressor 38 low. For this reason, the ratio of the stop time of the compressor 38 is reduced, whereby a warm refrigerant always flows through the dew-proof pipe 64, thereby suppressing a temperature drop of the cabinet 12 and preventing condensation. When a large load (hot food) is input or when the user selects the rapid cooling mode, the rotation is performed at the normal maximum frequency. On the other hand, when the detected humidity is lower than the reference humidity, the compressor 38 is rotated at the normal maximum frequency.

  As a modification of the present embodiment, as shown in FIG. 9, the maximum rotational speed is linearly decreased as the detected humidity (saturated water vapor amount) is higher. Thereby, dew condensation can be prevented more reliably.

  Moreover, you may perform the dew condensation prevention mode of this embodiment, performing the dew condensation prevention mode in Embodiment 1,2.

Embodiment 4

  Next, the dew condensation prevention mode of the refrigerator 10 of Embodiment 4 is demonstrated.

  The refrigerant that has become a high-temperature and high-pressure gas in the compressor 38 radiates and liquefies in the condenser 62 and flows to the dew-proof pipe 64. Since the temperature of the refrigerant flowing through the dew prevention pipe 64 gradually decreases after leaving the condenser 62, the temperature is lowest at the end of the dew prevention pipe 64. Therefore, in a high humidity environment, even if the compressor 38 is operating, there is a possibility that the dew proof performance cannot be maintained at the end of the dew proof pipe 64.

  In order to prevent this, in the dew condensation prevention mode of this embodiment, when the detected humidity is higher than the reference humidity, the heat of the condenser 62 is dissipated by lowering or stopping the rotational speed of the C fan 63. Is suppressed, the temperature of the refrigerant flowing in the dew prevention pipe 64 is increased, and the dew prevention performance at the end of the dew prevention pipe 64 is improved.

  As a modified example of the present embodiment, as shown in FIG. 10, the rotational speed of the C fan 62 decreases linearly as the detected humidity (saturated water vapor amount) is higher. Thereby, dew condensation can be prevented more reliably.

  Moreover, you may perform the dew condensation prevention mode of this embodiment, performing the dew condensation prevention mode in Embodiment 1-3.

Embodiment 5

  Next, the dew condensation prevention mode of the refrigerator 10 according to the fifth embodiment will be described.

  The surface temperature of the cabinet 12 depends on the temperature of the refrigerant flowing in the dewproof pipe 64 and the internal temperature. Therefore, when the R fan 32 and the F fan 36 are stopped or the rotation speed is low, cold air accumulates in the refrigerated space 22 or the lower portion of the freezing space 24 or a portion where the cold air hardly flows, and the inside temperature is locally stored. A low part is made. In such a case, the temperature of the surface of the cabinet 12 corresponding to the portion where the local temperature is low may decrease and condensation may occur.

  In order to prevent this, in the dew condensation prevention mode of the present embodiment, the rotational speed of the R fan 32 and the F fan 36 is increased in a high-humidity environment so that the temperature distribution in the cabinet is not biased and is locally applied. Suppresses temperature drop and prevents condensation. That is, when the detected humidity is higher than the reference humidity, the rotational speed of the R fan 32 and the F fan 36 is increased or rotated at the maximum rotational speed regardless of the control state of the R mode and the F mode. Thereby, dew condensation can be prevented.

  As a modification of the present embodiment, as shown in FIG. 11, the rotational speed of the internal fans (R fan 32, F fan 36) is increased linearly as the detected humidity (saturated water vapor amount) is higher. Thereby, dew condensation can be prevented more reliably.

  Moreover, you may perform the dew condensation prevention mode of this embodiment, performing the dew condensation prevention mode in Embodiment 1-4.

Embodiment 6

  Next, the dew condensation prevention mode of the refrigerator 10 of Embodiment 6 is demonstrated based on FIG.

  In each of the above embodiments, the reference humidity is constant regardless of the outside temperature. However, in the dew condensation prevention mode of this embodiment, the reference humidity is changed based on the detected temperature detected by the outside temperature sensor 46. . That is, as shown in FIG. 12, when the detection temperature is less than 20 ° C., the reference humidity is set to 50%, and when the detection temperature is 20 ° C. or more, the reference humidity is lowered to 40%. The reason for this is that as the temperature rises, the amount of saturated water vapor rises and condensation tends to occur.

  Moreover, you may perform the dew condensation prevention mode of this embodiment, performing the dew condensation prevention mode in Embodiment 1-5.

Embodiment 7

  Next, the refrigerator 10 of Embodiment 7 is demonstrated.

  In each of the above embodiments, the outside humidity sensor 48 and the outside temperature sensor 46 are provided on the door 14a of the refrigerator compartment 14, but in this embodiment, they are attached to the outer wall of the cabinet 12 corresponding to the downstream side of the dewproof pipe 64, The dew condensation prevention mode in the first to sixth embodiments is executed.

  The reason for this configuration is as follows. Since the temperature of the dew prevention pipe 64 gradually decreases after it comes out of the condenser 62, the outside of the cabinet 12 on the end side is the lowest temperature. Therefore, by providing the outside temperature sensor 46 and the outside humidity sensor 48 on the downstream side of the dew prevention pipe 64, it is possible to prevent dew condensation of the entire refrigerator 10 by preventing condensation in a place where the temperature is the lowest and easily condenses. It can be carried out.

  In the present specification, the “downstream side of the dew prevention pipe 64” means that the dew prevention pipe 64 coming out of the condenser 62 is L / 2 when the total length of the dew prevention pipe 64 is L. The part from the end to the end through the length.

Embodiment 8

  Next, the refrigerator 10 of Embodiment 8 is demonstrated.

  In said each Embodiment 1-7, when it is more than reference | standard humidity using the refrigerating cycle 60, dew condensation is prevented. However, in the refrigerator compartment 14 of the refrigerator 10 of the present embodiment, a double door 14a is installed, and in such a door, the dew proof pipe 64 cannot be moved between the left and right doors. 58 is installed. Therefore, in addition to the dew condensation prevention mode in each of the first to seventh embodiments, the main control unit 60 adjusts the output to the dew condensation heater 58.

  Specifically, the main control unit 60 calculates the dew condensation prevention temperature (dew point + α) at the partition portion based on the detected outside temperature of the outside temperature sensor 46 and the detected humidity of the outside humidity sensor 48. Then, the main control unit 60 adjusts the output to the dew-proof heater 58 by the DUTY ratio so that the partition portion is heated above the calculated dew-condensation prevention temperature. For example, α is 2 ° C. to 3 ° C. As shown in FIG. 13, as the saturated water vapor amount (relative humidity) increases, the DUTY ratio of the dew protection heater 58 is increased, and as shown in FIG. 14, the relative humidity increases and the outside temperature t of the detection chamber increases. The DUTY ratio of the dew proof heater 58 is increased as much as possible.

The method for obtaining the dew point temperature from the temperature outside the detection chamber and the detected humidity is, for example,

Relative humidity = (saturated water vapor at dew point temperature / saturated water vapor at air) x 100

The relationship is used. Rewriting this formula,

Detected humidity = (saturated water vapor amount at dew point temperature / saturated water vapor amount of air at temperature outside detection chamber) × 100

The dew point temperature is calculated from here.

  According to this embodiment, since the heating temperature of the dew-proof heater 58 can be minimized, the dew-proof performance in this partition portion can be maintained while suppressing power consumption.

  As a modified example of the present embodiment, a table storing the above relationship is prepared. That is, the relationship is stored in advance in the table with the outside temperature of the detection chamber and the detected humidity as input parameters and the voltage output to the dew-proof heater 58 as output parameters. When the outside temperature and the detected humidity are input, the main control unit 60 directly calls the voltage output to the dew prevention heater 58 from this table without calculating the dew condensation prevention temperature. The output of this table is obtained in advance by experiments so that the heater temperature of the dew-proof heater 58 is equal to or higher than the dew point temperature.

Embodiment 9

  Next, the refrigerator 10 of Embodiment 9 is demonstrated.

  The present embodiment is a modification of the eighth embodiment. In addition to obtaining the dew point temperature from the detected outside temperature of the outside temperature sensor 46 and the detected humidity of the outside humidity sensor 48, in addition to this, the R of the R sensor 50 is calculated. Temperature is also used. That is, condensation is more likely to occur as the R temperature is lower and the temperature outside the detection chamber is higher. Therefore, as in the eighth embodiment, regarding the dew point temperature obtained from the outside temperature sensor 46 and the outside humidity sensor 48, the dew point temperature is lowered as the difference between the detected outside temperature and the R temperature increases, and the output of the dew prevention heater 58 is increased. To raise. This relationship is obtained in advance in an experiment in the same manner as described above and stored in a table.

  According to this embodiment, since the heating temperature of the dew-proof heater 58 can be minimized, the dew-proof performance in this partition portion can be maintained while suppressing power consumption.

  As a modification of the present embodiment, the dew point temperature is not calculated from the detected outside temperature, detected humidity, and R temperature, but is calculated from the detected outside temperature, detected humidity, and the F temperature detected by the F sensor 52. May be.

Embodiment 10

  Next, the refrigerator 10 of Embodiment 10 is demonstrated.

  The present embodiment is a modification of the eighth embodiment, and the R temperature of the refrigerator compartment 14 is input as a preset temperature in advance. Similarly to the eighth embodiment, the dew point temperature is obtained from the outside temperature sensor 46 and the outside humidity sensor 48, and the output of the dew prevention heater 58 is increased as the set temperature is higher. Similar to the above, this relationship is obtained in advance by experiments and stored in a table.

Example of change

  In each of the above embodiments, the refrigeration cycle having two evaporators has been described. However, instead of this, a refrigeration cycle including one evaporator may be used.

  Although several embodiments of the present invention have been described, these embodiments are 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.

DESCRIPTION OF SYMBOLS 10 ... Refrigerator, 12 ... Cabinet, 30 ... R Eva, 32 ... R Fan, 34 ... F Eva, 36 ... F Fan, 38 ... Compressor, 46 ... ..External temperature sensor, 48 ... External humidity sensor, 50 ... R sensor, 52 ... F sensor, 58 ... Dew-proof heater, 60 ... Refrigeration cycle, 62 ... Condensation , 63... C fan, 64 .. dew pipe, 76.

Claims (11)

A humidity sensor for detecting the humidity outside the refrigerator cabinet;
A compressor, a condenser, a dew proof pipe provided in the cabinet, an evaporator, an in-compartment fan for blowing cool air of the evaporator into the interior, a refrigeration cycle having a condenser fan for cooling the condenser;
When the detected humidity detected by the humidity sensor is high, a control unit that executes a condensation prevention mode using the refrigeration cycle to prevent condensation in the refrigerator;
Refrigerator. Further having an internal temperature sensor for detecting the internal temperature in the cabinet;
The controller drives the compressor when the detected internal temperature detected by the temperature sensor rises to a cooling start temperature, and stops the compressor when the detected internal temperature falls to a cooling end temperature,
In the dew condensation prevention mode, the control unit narrows a control temperature range that is a difference between the cooling start temperature and the cooling end temperature as the detected humidity is higher.
The refrigerator according to claim 1. In the dew condensation prevention mode, the control unit drives the compressor when the compressor stop time is equal to or longer than a predetermined maximum stop time.
The refrigerator according to claim 1 or 2. In the dew condensation prevention mode, the control unit lowers the maximum rotation speed of the compressor as the detected humidity increases.
The refrigerator according to any one of claims 1 to 3. In the dew condensation prevention mode, the control unit lowers the rotation speed of the condenser fan as the detected humidity increases.
The refrigerator as described in any one of Claims 1 thru | or 4. In the dew condensation prevention mode, the control unit lowers the rotation speed of the internal fan as the detected humidity is higher.
The refrigerator according to any one of claims 1 to 5. An outside temperature sensor for detecting an outside temperature outside the cabinet;
The control unit executes the dew condensation prevention mode when the detected humidity is higher than a reference humidity and the detected outside temperature is higher than the reference outside temperature.
The refrigerator as described in any one of Claims 1 thru | or 4. A freezing room is provided in the cabinet,
The humidity sensor is provided outside the dew proof pipe provided along the wall surface of the freezer compartment,
The refrigerator according to claim 1. The humidity sensor is provided outside the downstream side of the dew-proof pipe.
The refrigerator according to claim 7. Having a dew-proof heater for heating the cabinet or the door of the storage room;
The control unit increases the output of the dew-proof heater as the dew point temperature obtained from the detected humidity of the humidity sensor and the detected temperature outside the warehouse is higher.
The refrigerator according to any one of claims 7 to 9. Further having an internal temperature sensor for detecting the internal temperature in the cabinet;
In addition to the detected humidity of the humidity sensor and the detected temperature outside the storage temperature sensor, the control unit outputs the output of the dew-proof heater as the dew point temperature obtained from the set internal temperature relative to the detected internal temperature increases. Strengthen,
The refrigerator according to claim 10.

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