JP2017116256A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that can reduce power consumption and prevent insufficient cooling in a freezing chamber.SOLUTION: A refrigerator comprises a freezing chamber 5 that freezes and stores stored objects, a refrigerating chamber 4 that refrigerates and stores stored objects, a compressor 31 that operates a freezing cycle, a cooler 35 arranged in a low-temperature part of the freezing cycle, a blower fan 10 arranged downstream of the cooler 35, a defrosting heater 36 that defrosts the cooler 35, a defrosting temperature sensor 22 that detects a temperature of the cooler 35, a control unit that controls the defrosting heater 36 on the basis of the detected temperature of the defrosting temperature sensor 22, and a refrigerating chamber temperature sensor 21 that detects a temperature in the refrigerating chamber 4, and controls driving of the compressor 31 and the blower fan 10 on the basis of the detected temperatures of the refrigerating chamber temperature sensor 21 and the defrosting temperature sensor 22.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a refrigerator provided with a defrosting temperature sensor.

  A conventional refrigerator is disclosed in Patent Document 1. This refrigerator includes a main body having a heat insulating box filled with a heat insulating material. A refrigeration room is provided in the lower part of the main body, and a freezing room is provided above the refrigeration room. Front surfaces of the refrigerator compartment and the freezer compartment are each opened and closed by a heat insulating door. A machine room is provided behind the freezer room.

  A compressor for operating the refrigeration cycle is disposed in the machine room. A cool air passage through which cool air flows is provided behind the freezer compartment and the refrigerator compartment. A cooler serving as a low temperature part of the refrigeration cycle is disposed in the cold air passage behind the freezer compartment, and a blower fan is disposed downstream of the cooler.

  A refrigerating room temperature sensor and a heater are provided in the refrigerating room. The refrigerator temperature sensor detects the temperature in the refrigerator compartment. The heater keeps the cold room temperature sensor while the compressor is stopped.

  In the refrigerator having the above configuration, when the temperature detected by the refrigerator temperature sensor is higher than a predetermined upper limit temperature, the compressor and the blower fan are driven. When the compressor is driven, the refrigeration cycle is operated, and heat flowing between the air flowing in the cold air passage and the cooler generates cold air. The cool air generated by the cooler flows into the freezer compartment and the refrigerator compartment through the cool air passage by the blower fan.

  When the temperature detected by the refrigerator temperature sensor becomes lower than a predetermined lower limit temperature, the compressor and the blower fan are stopped. Thereby, the refrigerator compartment is maintained between the upper limit temperature and the lower limit temperature, and the freezer compartment is cooled at the same time as the refrigerator compartment and maintained in a predetermined temperature range.

  At this time, when the outside air temperature is low and the heat load of the refrigerator is small, if the detection of the refrigerator temperature sensor is delayed with respect to the temperature change of the refrigerator, the compressor stop time becomes long and the freezer compartment is insufficiently cooled. For this reason, when the outside air temperature is low, the refrigerator temperature sensor is maintained at a predetermined temperature between the upper limit temperature and the lower limit temperature by causing the heater to generate heat when the compressor is stopped. As a result, even when the outside air temperature is low, a temperature change in the refrigerator compartment is quickly detected to drive the compressor, and insufficient cooling of the freezer compartment is suppressed.

JP 2006-71250 A

  However, according to the conventional refrigerator, the freezer compartment is not cooled when there is no temperature change in the refrigerator compartment when the heat insulating door of the freezer compartment is opened or closed and the temperature in the freezer compartment rises. For this reason, there was a problem that insufficient cooling of the freezer room still occurred. In addition, there is a problem that the amount of power consumption increases by the amount of heater energization.

  An object of the present invention is to more reliably prevent insufficient cooling in a freezer compartment by suppressing power consumption.

  In order to achieve the above object, the refrigerator of the present invention is arranged in a freezer room for storing stored items in a refrigerator, a refrigerator room for storing stored items in a refrigerator, a compressor for operating a refrigeration cycle, and a low temperature part of the refrigeration cycle. A cooler, a blower fan disposed downstream of the cooler, a defrost heater that defrosts the cooler, a defrost temperature sensor that detects the temperature of the cooler, and the defrost temperature sensor A controller that controls the defrost heater based on the detected temperature of the refrigerator, and a refrigerator temperature sensor that detects the temperature of the refrigerator compartment, and based on the detected temperatures of the refrigerator temperature sensor and the defrost temperature sensor. And controlling the drive of the compressor and the blower fan.

  According to this structure, the drive of a compressor and a ventilation fan is started based on the detected temperature of a refrigerator compartment temperature sensor and a defrost temperature sensor. When driving of the compressor and the blower fan is started, cold air generated by heat exchange between the air and the cooler is discharged into the freezer compartment and the refrigerator compartment. Thereby, a freezer compartment and a refrigerator compartment are cooled. Moreover, the drive of a compressor and a ventilation fan is stopped based on the detected temperature of a refrigerator compartment temperature sensor and a defrost temperature sensor.

  Further, in the refrigerator having the above-described configuration, when the detection temperature of the refrigerator temperature sensor is higher than the first upper limit temperature or when the detection temperature of the defrost temperature sensor is higher than the second upper limit temperature, Start driving the compressor and the blower fan, and when the detected temperature of the refrigerator temperature sensor is lower than the first lower limit temperature and when the detected temperature of the defrost temperature sensor is lower than the second lower limit temperature The compressor and the blower fan are stopped.

  Further, in the refrigerator having the above-described configuration, when the refrigerator door that opens or closes the refrigerator compartment or the freezer compartment door that opens or closes the refrigerator compartment is opened during driving of the compressor and the fan, And the compressor is continuously driven regardless of the detection results of the refrigerator temperature sensor and the defrost temperature sensor until a predetermined time has elapsed after the refrigerator door or the freezer door is closed. It is characterized by.

  In the refrigerator having the above-described configuration, the present invention further includes an outside air temperature sensor that detects outside air temperature, and operates the blower fan at a high speed when the temperature detected by the outside air temperature sensor is higher than a predetermined temperature, and the blower fan when the temperature is low. It is characterized by operating at low speed.

  Further, the present invention is characterized in that, in the refrigerator configured as described above, when the previous operation time of the compressor is shorter than a predetermined time, the blower fan is operated at a low speed regardless of the temperature detected by the cold room temperature sensor. .

  Moreover, the present invention is characterized in that, in the refrigerator having the above-described configuration, the defrosting temperature sensor is arranged with a predetermined amount of gap with respect to the cooler.

  According to the present invention, since the drive of the compressor and the blower fan is controlled based on the temperature detected by the refrigerating room temperature sensor and the defrost temperature sensor, power consumption can be suppressed and insufficient cooling of the freezer compartment can be prevented.

Side surface sectional drawing which shows the refrigerator of embodiment of this invention Front sectional drawing which shows the refrigerator of embodiment of this invention The perspective view which shows the other aspect of the temperature control part of the refrigerator of embodiment of this invention. The flowchart which shows operation | movement of the refrigerator of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG.2 and FIG.2 has shown the side sectional drawing and front sectional drawing which show the refrigerator 1 of one Embodiment.

  The refrigerator 1 includes a main body 2 having a heat insulating box 3 filled with a heat insulating material. A refrigerator compartment 4 is provided at the upper part of the main body 2, and a freezer compartment 5 is provided at the lower part of the refrigerator compartment 4. The front surfaces of the refrigerator compartment 4 and the freezer compartment 5 are opened and closed by the refrigerator compartment door 4a and the freezer compartment door 5a, respectively.

  In the refrigerator compartment 4, a temperature adjusting unit 30, a refrigerator temperature sensor 21, a refrigerator compartment opening / closing sensor (not shown), and an interior lamp (not shown) are provided.

  The temperature adjustment unit 30 includes a refrigerator compartment temperature adjustment unit 26 and a freezer compartment temperature adjustment unit 27. The refrigerator compartment temperature adjusting unit 26 adjusts the amount of cold air discharged into the refrigerator compartment 4 by sliding the knob 26 a in the left-right direction, and adjusts the temperature inside the refrigerator compartment 4. The freezer compartment temperature adjustment unit 27 is arranged below the refrigerator compartment temperature adjustment unit 26, and slides the knob 27a in the left-right direction to adjust the ratio of the amount of cold air discharged into the freezer compartment 5 and the refrigerator compartment 4, thereby freezing compartment. Adjust the temperature in 5.

  The refrigerator temperature sensor 21 is disposed above the refrigerator compartment temperature adjustment unit 26. The refrigerator temperature sensor 21 detects the temperature in the refrigerator compartment 4. The refrigerator compartment open / close sensor detects the open / close state of the refrigerator compartment door 4a. The interior light is turned on when the refrigerator compartment door 4a is opened, and turned off when the door is closed.

  The temperature adjustment unit 30 may be configured as shown in FIG. In other words, the rotary temperature adjustment unit 30 has the refrigerator compartment temperature adjustment unit 28 disposed in the vicinity of the freezer compartment temperature adjustment unit 29. The temperature adjustment unit 30 is provided with a variable resistor (not shown), a base 30a, and knobs 28a and 29a.

  The refrigerator compartment temperature adjustment unit 28 and the freezer compartment temperature adjustment unit 29 rotate the knobs 28 a and 29 a to change the resistance value, and the control unit (not shown) controls the control temperatures of the refrigerator compartment temperature sensor 21 and the defrost temperature sensor 22. To adjust the temperature of each storage room. In this case, an axial-shaped refrigerator compartment temperature sensor 21 or an interior lamp (not shown) having an LED light source may be mounted on the base 30a. Thereby, the number of parts can be reduced and the cost of the refrigerator 1 can be reduced.

  The temperature adjusting unit 30 has one of the refrigerator temperature adjusting unit 28 and the freezer temperature adjusting unit 29 having a rotary knob as shown in FIG. 3 to adjust the temperature, and the other as shown in FIG. A configuration in which the temperature is adjusted by having a sliding knob may be used.

  In the freezer compartment 5, a freezer compartment opening / closing sensor (not shown) and an interior lamp (not shown) are provided. The freezer compartment open / close sensor detects the open / close state of the freezer compartment door 5a. The interior light is turned on when the freezer door 5a is opened, and turned off when the freezer door 5a is closed.

  A machine room 6 disposed below the heat insulating box 3 is provided in the lower rear portion of the main body 2. A compressor 31 for operating the refrigeration cycle is disposed in the machine room 6.

  A cool air passage 7 through which cool air flows is provided behind the freezer compartment 5. The cool air passage 7 has a discharge port 7 a and a return port 7 b that face the freezer compartment 5. The cool air passage 7 is provided with a cooler 35 serving as a low temperature part of the refrigeration cycle.

  A blower fan 10 is disposed above the cooler 35. Cool air flows through the cool air passages 7 and 8 by driving the blower fan 10. A defrosting temperature sensor 22 is disposed near the upper part of the cooler 35, and a defrosting heater 36 and a drain pan 33 are disposed below.

The defrosting heater 36 is driven at a predetermined cycle (for example, when the value obtained by integrating the operation time of the compressor 31 becomes 10 hours), and performs the defrosting operation of the cooler 35. When the defrosting operation is performed, drain water is collected in the drain pan 33 and guided to the evaporating dish 32 through the pipe 33. The drain water stored in the evaporating dish 32 is evaporated by the heat of the compressor 31.

  The defrosting temperature sensor 22 is arranged with a predetermined gap with respect to the cooler 35 and detects the temperature of the cooler 35 to determine the stop timing of the defrosting operation.

  A cold air passage 8 communicating with the cold air passage 7 is provided behind the refrigerator compartment 4. A discharge port 8 a facing the inside of the refrigerator compartment 4 is opened in the cold air passage 8. The refrigerating chamber 4 is provided with a return port 9a, and a return passage 9 is provided for communicating the return port 9a with the upstream side of the cooler 35 of the cool air passage 7.

  A leg portion 19 is provided at the front portion of the lower end of the main body portion 2. A wheel 20 is provided at the rear of the lower end of the main body 2. If the front part of the main-body part 2 is lifted, the wheel 20 can roll on the installation surface of the refrigerator 1, and the refrigerator 1 can be moved.

  An outside air temperature sensor 23 for detecting outside air temperature is provided on the upper surface of the main body 2. Moreover, the main-body part 2 is provided with a control part (not shown) for controlling each part, and the control part has a timer for measuring time.

  In the refrigerator 1 having the above-described configuration, the cold air generated by the heat exchange between the air flowing through the cold air passage 7 and the cooler 35 by driving the compressor 31 and the blower fan 10 is discharged from the discharge port 7a to the freezer compartment 5. . The cold air discharged from the discharge port 7a flows through the freezer compartment 5 and returns to the cooler 35 via the return port 7b. Thereby, cooling in the freezer compartment 5 is performed.

  Further, cold air flows from the cold air passage 7 into the cold air passage 8 and is discharged into the refrigerator compartment 4 from the discharge port 8a. The cold air discharged from the discharge port 8a flows through the refrigerator compartment 4, flows through the return passage 9 via the return port 9a, and returns to the cooler 35. Thereby, the inside of the refrigerator compartment 4 is cooled.

  FIG. 4 is a flowchart showing the detailed operation of the refrigerator 1. In step S1, it is determined whether the refrigerator 1 is in a defrosting operation. When the defrosting operation is being performed, the process returns to step S1, and when the defrosting operation is not being performed, the process proceeds to step S2.

  In step S2, it is determined whether or not the detected temperature Tr of the refrigerator temperature sensor 21 is higher than an upper limit temperature (first upper limit temperature, 6 ° C. in the present embodiment). When the detected temperature Tr of the refrigerator compartment temperature sensor 21 is higher than the upper limit temperature, the process proceeds to step S4, and when it is low, the process proceeds to step S3.

  In step S3, it is determined whether or not the detected temperature Tdef of the defrosting temperature sensor 22 is higher than the upper limit temperature (second upper limit temperature, -16 ° C. in the present embodiment). If the detected temperature Tdef of the defrost temperature sensor 22 is higher than the upper limit temperature, the process proceeds to step S4, and if it is low, the process proceeds to step S2. Thereby, steps S2 and S3 are repeatedly performed until the detected temperature Tr of the refrigerator compartment temperature sensor 21 or the detected temperature Tdef of the defrost temperature sensor 22 exceeds the upper limit temperature.

  In step S4, the compressor 31 is driven and the refrigeration cycle is operated. In step S5, it is determined whether or not the previous operation time of the compressor 31 is shorter than a predetermined time. If the operation time of the compressor 31 is shorter than the predetermined time, the process proceeds to step S7, and if not, the process proceeds to step S6.

In step S6, it is determined whether or not the detected temperature (outside air temperature) of the outside air temperature sensor 23 is higher than a predetermined temperature (12 ° C. in the present embodiment). If the temperature detected by the outside air temperature sensor 23 is high, the process proceeds to step S8. If not, the process proceeds to step S7.

  In step S7, the blower fan 10 is driven at a low speed, and in step S8, the blower fan 10 is driven at a high speed. When the operation time of the previous compressor 31 is short or when the outside air temperature is 12 ° C. or less, it is determined that the heat load is small, and even if the blower fan 10 is slowed down, the cold air is reduced to the desired temperature by heat exchange with the cooler 35. The temperature can be lowered. Thereby, power saving of the refrigerator 1 can be achieved.

  Moreover, the ratio of the cold air distributed to the refrigerator compartment 4 and the freezer compartment 5 tends to increase when the blower fan 10 is slowed down. This is the ratio of the cool air distributed to the freezer compartment 5 side that returns to the blower fan 10 over a short distance with respect to the cold air distributed to the refrigerator compartment 4 side that returns to the blower fan 10 after turning away from the blower fan 10. The reason is that there are many. Therefore, it is possible to actively cool the freezer compartment 5 and not cool the refrigerator compartment 4 too much.

  In step S9, it is determined whether the refrigerator compartment door 4a or the freezer compartment door 5a has been opened. When the refrigerator compartment door 4a or the freezer compartment door 5a is opened, the process proceeds to step S15, and when the refrigerator compartment door 4a or the freezer compartment door 5a is not opened, the process proceeds to step S10.

  In step S10, it is determined whether or not the detected temperature Tr of the refrigerator temperature sensor 21 is lower than a lower limit temperature (first lower limit temperature, 2 ° C. in the present embodiment). If the detected temperature Tr of the refrigerator compartment temperature sensor 21 is lower than the lower limit temperature, the process proceeds to step S11, and if not, the process proceeds to step S5.

  In step S11, it is determined whether or not the detected temperature Tr of the refrigerator compartment temperature sensor 21 is lower than a predetermined temperature (-1 ° C. in the present embodiment) lower than the lower limit temperature. If the detected temperature Tr of the refrigerator compartment temperature sensor 21 is lower than −1 ° C., the process proceeds to step S20, and if not, the process proceeds to step S12. When the detected temperature Tr of the refrigerator compartment temperature sensor 21 becomes lower than −1 ° C., the blower fan 10 and the compressor 31 are immediately stopped (step S20, step S21), thereby preventing the refrigerator compartment 4 from freezing.

  In step S12, the blower fan 10 is driven at a low speed. When the temperature of the refrigerator compartment 4 becomes lower than 2 ° C., the cool air returning from the refrigerator compartment 4 to the cooler 35 is low in temperature, so that the cool air is lowered to a desired temperature by heat exchange with the cooler 35 even if the blower fan 10 is slowed down. Can do. Thereby, power saving of the refrigerator 1 can be achieved. Similarly to step S7, by making the blower fan 10 at a low speed, the freezer compartment 5 can be actively cooled, and the refrigerator compartment 4 can be prevented from being cooled too much.

  In step S13, it is determined whether or not the detected temperature Tdef of the defrost temperature sensor 22 is lower than the lower limit temperature (second lower limit temperature, −22 ° C. in the present embodiment). If the detected temperature Tdef of the defrosting temperature sensor 22 is lower than the lower limit temperature, the process proceeds to step S14, and if not, the process proceeds to step S5.

  If the refrigerator compartment door 4a or the freezer compartment door 5a is opened by judgment of step S9, an interior lamp will light in step S15. In step S16, the driving of the blower fan 10 is stopped. Thereby, the outflow of the cold air heat-exchanged with the cooler 35 can be suppressed.

  In step S17, it waits until the opened refrigerator compartment door 4a or freezer compartment door 5a is closed. If the refrigerator compartment door 4a or the freezer compartment door 5a is closed, it will transfer to step S18.

  In step S18, time is started by the timer. In step S19, the interior lamp is turned off, and the process returns to step S5. The blower fan 10 whose driving has been stopped is started again in steps S7 and S8.

  In step S14, it is determined whether or not a predetermined time (3 minutes in the present embodiment) has passed since the refrigerator compartment door 4a or the freezer compartment door 5a is closed by the timer started in step S18. If the predetermined time has elapsed, the process proceeds to step S20, and if not, the process returns to step S5. Thereby, step S5-step S14 are performed repeatedly.

  Due to the stop of the blower fan 10 in step S16, stagnant cold air exists in the cold air passages 7 and 8. At this time, the compressor 31 is operating and the blower fan 10 is stopped, and the temperature of the cooler 35 is lowered. This is because the cooler 35 does not exchange heat with the high temperature return cold air.

  Thereafter, when the blower fan 10 is driven, the cooler 35 is at a low temperature even though the inside of the freezer compartment 5 is heated due to the outside air flowing into the refrigerator compartment 4 or the freezer compartment 5, and the defrosting temperature sensor 22 detection temperature Tdef may become a lower limit temperature. Therefore, it is possible to improve the detection accuracy of the defrosting temperature sensor 22 by determining whether or not a predetermined time has elapsed since the refrigerator door 4a or the freezer door 5a is closed.

  In step S20, the driving of the blower fan 10 is stopped. In step S21, the driving of the compressor 31 is stopped, and the process returns to step S1.

  According to this embodiment, since the drive of the compressor 31 and the blower fan 10 is controlled based on the temperature detected by the cold room temperature sensor 21 and the defrost temperature sensor 22, power consumption is suppressed and cooling in the freezer room 5 is insufficient. Can be prevented. Moreover, since it is not necessary to provide the temperature sensor which detects the temperature in the freezer compartment 5, and the defrost temperature sensor 22 is used, the increase in the cost of the refrigerator 1 can be suppressed.

  Moreover, when the detection temperature Tr of the refrigerator temperature sensor 21 is higher than the upper limit temperature (first upper limit temperature) or when the detection temperature Tdef of the defrost temperature sensor 22 is higher than the upper limit temperature (second upper limit temperature). Driving of the compressor 31 and the blower fan 10 is started, and when the detection temperature Tr of the refrigerating room temperature sensor 21 is lower than the lower limit temperature (first lower limit temperature) and the detection temperature Tdef of the defrost temperature sensor 22 is the lower limit temperature (first Since the compressor 31 and the blower fan 10 are stopped when the temperature is lower than (2 lower limit temperature), insufficient cooling in the freezer compartment 5 can be easily prevented.

  Moreover, when the refrigerator compartment door 4a or the freezer compartment door 5a is opened while the compressor 31 and the blower fan 10 are driven, the blower fan 10 is stopped. Thereby, the outflow of the cold air heat-exchanged with the cooler 35 can be suppressed. Further, the compressor 31 is continuously driven regardless of the detection results of the refrigerating room temperature sensor 21 and the defrosting temperature sensor 22 until a predetermined time elapses after the refrigerating room door 4a and the freezing room door 5a are closed. This prevents the detected temperature Tdef of the defrosting temperature sensor 22 from immediately reaching the lower limit temperature due to stagnant cold air.

  Further, the blower fan 10 is operated at a high speed when the temperature detected by the outside air temperature sensor 23 is higher than a predetermined temperature, and the blower fan 10 is operated at a low speed when the temperature is low. Thereby, when the outside air temperature is low and the heat load is small, the blower fan 10 can be operated at a low speed to save power in the refrigerator 1.

Further, when the previous operation time of the compressor 31 is shorter than the predetermined time, the blower fan 10 is operated at a low speed regardless of the temperature Tr detected by the refrigerator temperature sensor 21, so that the previous operation time of the compressor 31 is a predetermined time. If it is shorter than that, it is judged that the heat load is small. When the thermal load is small, the blower fan 10 can be operated at a low speed to save power in the refrigerator 1.

  Further, since the defrosting temperature sensor 22 is disposed with a predetermined amount of gap with respect to the cooler 35, it is possible to detect the temperature of the cool air separated from the cooler 35 when the compressor 31 is driven. As a result, the detection temperature Tdef of the defrosting temperature sensor 22 becomes higher than that of the cooler 35 having a low temperature, and is brought close to the temperature in the freezer compartment 5. Accordingly, the compressor 31 and the blower fan 10 can be controlled based on the detected temperature Tdef of the defrosting temperature sensor 22 that is closer to the temperature in the freezer compartment 5, and the cooling of the freezer compartment 5 can be more reliably prevented. it can.

  Further, the blower fan 10 may be provided with a medium speed operation or the like according to the situation in addition to the two operations of the low speed operation and the high speed operation. Further, although the outside air temperature is detected by the outside air temperature sensor 23, the outside air temperature may be derived by the time during which the compressor 31 is stopped. When the stop time of the compressor 31 is long, it can be determined that the heat load of the refrigerator 1 is small and the outside air temperature is low.

  According to this invention, it can utilize for the refrigerator provided with the defrost temperature sensor.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Main-body part 3 Heat insulation box 4 Refrigeration room (storage room)
5 Freezing room (storage room)
6 Machine room 7, 8 Cold air passage 9 Return passage 9a Return port 10 Blower fan 19 Leg portion 20 Wheel 21 Refrigerating room temperature sensor 22 Defrosting temperature sensor 23 Outside air temperature sensor 26 Refrigerating room temperature adjustment section 27 Freezing room temperature adjustment section 28 Refrigerating room Room temperature adjuster 29 Freezer temperature adjuster 30 Temperature adjuster 31 Compressor 32 Evaporating dish 33 Drain pan 33a Pipe 35 Cooler 36 Defroster heater

Further, in the refrigerator having the above-described configuration, when the detection temperature of the refrigerator temperature sensor is higher than the first upper limit temperature or when the detection temperature of the defrost temperature sensor is higher than the second upper limit temperature, the compressor and the blower fan starts driving, sensing the temperature of the refrigerating chamber temperature sensor is characterized by stopping the compressor and the blower fan to the low temperature cases than the first lower limit temperature.

In step S10, it is determined whether or not the detected temperature Tr of the refrigerator temperature sensor 21 is lower than the lower limit temperature ( third lower limit temperature, 2 ° C. in the present embodiment). If the detected temperature Tr of the refrigerator compartment temperature sensor 21 is lower than the lower limit temperature, the process proceeds to step S11, and if not, the process proceeds to step S5.

In step S11, it is determined whether or not the detected temperature Tr of the refrigerating room temperature sensor 21 is lower than a predetermined temperature lower than the lower limit temperature ( first lower limit temperature, −1 ° C. in the present embodiment). If the detected temperature Tr of the refrigerator compartment temperature sensor 21 is lower than −1 ° C., the process proceeds to step S20, and if not, the process proceeds to step S12. When the detected temperature Tr of the refrigerator compartment temperature sensor 21 becomes lower than −1 ° C., the blower fan 10 and the compressor 31 are immediately stopped (step S20, step S21), thereby preventing the refrigerator compartment 4 from freezing.

Moreover, when the detection temperature Tr of the refrigerator temperature sensor 21 is higher than the upper limit temperature (first upper limit temperature) or when the detection temperature Tdef of the defrost temperature sensor 22 is higher than the upper limit temperature (second upper limit temperature). since the compressor 31 and the blower fan 10 starts driving, stop detecting temperature Tr compressor 31 and the blower fan 10 to the low temperature cases than the lower limit temperature (a first lower limit temperature) of the refrigerating compartment temperature sensor 21, frozen Insufficient cooling in the chamber 5 can be easily prevented.

Claims (6)

A freezer room for storing stored items in a frozen state; a refrigerator room for storing stored items in a refrigerated state; a compressor for operating a refrigeration cycle; and a cooler disposed adjacent to a wall of the freezing chamber as a low temperature part of the refrigeration cycle. A blower fan that is arranged downstream of the cooler and distributes the cold air generated by the cooler to both the freezer compartment and the refrigerator compartment, a defrost heater that defrosts the cooler, and A defrosting temperature sensor for detecting the temperature of the cooler, a control unit for controlling the defrosting heater based on the temperature detected by the defrosting temperature sensor, and a refrigerating room temperature sensor for detecting the temperature of the refrigerating room. Prepared,
Control the drive of the compressor and the blower fan based on the temperature detected by the cold room temperature sensor and the defrost temperature sensor,
When the temperature detected by the refrigerator temperature sensor is higher than the first upper limit temperature or when the temperature detected by the defrost temperature sensor is higher than the second upper limit temperature, the compressor and the blower fan are started to be driven.
Stopping the compressor and the blower fan when the detected temperature of the refrigerator temperature sensor is lower than the first lower limit temperature and when the detected temperature of the defrost temperature sensor is lower than the second lower limit temperature. Features a refrigerator. A freezer room for storing stored products in a frozen state, a refrigerator room for storing stored products in a refrigerated state, a compressor for operating a refrigeration cycle, a cooler disposed in a low temperature part of the refrigerating cycle, and a downstream of the cooler. A defrosting heater for defrosting the cooler, a defrosting temperature sensor for detecting the temperature of the cooler, and controlling the defrosting heater based on the detected temperature of the defrosting temperature sensor. A control unit, and a refrigerator temperature sensor for detecting a temperature in the refrigerator compartment,
Control the drive of the compressor and the blower fan based on the temperature detected by the cold room temperature sensor and the defrost temperature sensor,
When the refrigerator door that opens or closes the refrigerator compartment or the freezer compartment door that opens or closes the freezer compartment is opened while the compressor and the fan are being driven, the fan is stopped and the refrigerator door or the The refrigerator is characterized in that the compressor is continuously driven regardless of the detection results of the cold room temperature sensor and the defrost temperature sensor until a predetermined time elapses after the freezer door is closed. A freezer room for storing stored products in a frozen state, a refrigerator room for storing stored products in a refrigerated state, a compressor for operating a refrigeration cycle, a cooler disposed in a low temperature part of the refrigerating cycle, and a downstream of the cooler. A defrosting heater for defrosting the cooler, a defrosting temperature sensor for detecting the temperature of the cooler, and controlling the defrosting heater based on the detected temperature of the defrosting temperature sensor. A control unit, and a refrigerator temperature sensor for detecting a temperature in the refrigerator compartment,
Control the drive of the compressor and the blower fan based on the temperature detected by the cold room temperature sensor and the defrost temperature sensor,
The refrigerator characterized in that when the previous operation time of the compressor is shorter than a predetermined time, the blower fan is operated at a low speed regardless of the temperature detected by the cold room temperature sensor. When the temperature detected by the refrigerator temperature sensor is higher than the first upper limit temperature or when the temperature detected by the defrost temperature sensor is higher than the second upper limit temperature, the compressor and the blower fan are started to be driven.
Stopping the compressor and the blower fan when the detected temperature of the refrigerator temperature sensor is lower than the first lower limit temperature and when the detected temperature of the defrost temperature sensor is lower than the second lower limit temperature. The refrigerator according to claim 2 or claim 3, characterized by the above.   An outside air temperature sensor for detecting an outside air temperature is provided, and the blower fan is operated at a high speed when the temperature detected by the outside air temperature sensor is higher than a predetermined temperature, and the blower fan is operated at a low speed when the temperature is low. The refrigerator as described in any one of 1-4.   The refrigerator according to claim 1, wherein the defrosting temperature sensor is disposed with a predetermined amount of gap with respect to the cooler.

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