JP5417397B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator.

  Japanese Patent No. 4341215 (Patent Document 1) is known as a conventional technique for controlling the refrigerant flow path during defrosting.

  Patent Document 1 discloses a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and a refrigerant that is condensed by the condenser with a fully-closed function that fully closes a refrigerant flow path. A depressurizing device for depressurization, a cooler for evaporating the refrigerant depressurized by the depressurizing device, an accumulator for storing surplus liquid refrigerant flowing out from the cooler, and a suction pipe connecting the accumulator and the compressor are sequentially connected. The refrigeration cycle, a defrost heater that melts frost attached to the cooler, and the decompression device is fully closed during the defrost operation that stops the operation of the compressor and energizes the defrost heater to remove the defrost from the cooler. Control means for closing the refrigerant flow path, and the liquid refrigerant that has flowed out of the cooler after the depressurization device is fully closed from energization start to stop of the defrost heater is stored in the accumulator. Technology to prevent the flowing out to the suction pipe overflow in over data is disclosed.

Japanese Patent No. 4341215

  However, in the prior art of Patent Document 1, since the refrigerant does not flow into the cooler when the defrost heater is energized, the rise in the temperature of the cooler due to the inflow of the refrigerant is suppressed, the defrost time becomes longer, and more power consumption is reduced. Consume.

  In addition, when there is a defrost heater in the lower part of the cooler as shown in Patent Document 1, since the defrost heater sequentially heats from the lower part of the cooler, there is a temperature difference between the upper part and the lower part of the cooler, The frost on the cooler cannot be melted efficiently.

  The present invention has been made in view of the above-mentioned problems of the prior art, and by controlling the refrigerant flowing into the cooler at the time of defrosting, the temperature rise of the cooler is made uniform, thereby reducing the power saving performance. The purpose is to get a high refrigerator.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. For example, a compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and a condenser that condenses the refrigerant. A decompressor for decompressing the refrigerant, a cooler for evaporating the refrigerant decompressed by the decompressor, a heating unit for heating the cooler, and a coolant channel adjusting unit for blocking the coolant channel In the refrigerator, during the defrosting operation of the cooler, the refrigerant flow path adjusting means shuts off the refrigerant flow path, stops the compressor, and the heating means heats the cooler for a predetermined time or The refrigerant flow path is opened after the cooler reaches a predetermined temperature.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator with high power saving performance can be obtained by equalizing the temperature rise of a cooler by controlling the refrigerant | coolant which flows into the cooler at the time of defrosting.

It is a front external view of the refrigerator which concerns on the Example of this invention. It is a longitudinal cross-sectional view showing the structure in the refrigerator compartment It is a front view showing the structure in the store | warehouse | chamber of a refrigerator. It is a partial front view showing the structure of a cooler peripheral part. It is a figure showing the structure of a defrost heater. It is a schematic diagram which shows the refrigerant | coolant flow path of the refrigerator which concerns on Example 1 of this invention. It is a time chart which shows control of Example 1 of this invention. It is a flowchart which shows the defrost control of Example 1 of this invention. It is a schematic diagram which shows the refrigerant | coolant flow path of the refrigerator which concerns on Example 2 of this invention. It is a time chart which shows control of Example 2 of this invention. It is a flowchart which shows the defrost control of Example 2 of this invention. It is a schematic diagram which shows the refrigerant | coolant flow path of the refrigerator which concerns on Example 3 of this invention. It is a time chart which shows control of Example 3 of this invention. It is a flowchart which shows the defrost control of Example 3 of this invention. It is a schematic diagram which shows the refrigerant | coolant flow path of the refrigerator which concerns on Example 4 of this invention. It is a schematic diagram which shows the refrigerant | coolant flow path of the refrigerator which concerns on Example 5 of this invention. It is a time chart which shows control of Example 5 of this invention. It is a flowchart which shows the defrost control of Example 5 of this invention. It is a time chart which shows control of Example 6 of this invention. It is a flowchart which shows the defrost control of Example 6 of this invention.

  The present invention includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant compressed by the compressor, a decompression device for decompressing the refrigerant condensed by the condenser, and a refrigerant decompressed by the decompression device. In a refrigerator having a cooler that evaporates the refrigerant, a heating means that heats the cooler, and a refrigerant flow path adjusting means that blocks the refrigerant flow path, the refrigerant flow path adjusting means during the defrosting operation of the cooler Shutting off the refrigerant flow path, stopping the compressor, and opening the refrigerant flow path for a predetermined time or after the cooler reaches a predetermined temperature while heating the cooler with the heating means. It is characterized by. Thereby, without increasing the heating amount by a heating means, defrosting time can be shortened and power consumption can be suppressed.

  A compressor that compresses the refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a decompressor that depressurizes the refrigerant condensed by the condenser; and evaporates the refrigerant decompressed by the decompressor. In a refrigerator having a cooler to be heated and a heating means for heating the cooler, a first refrigerant flow path for heating a front portion of the partition part of the storage chamber is provided in parallel with the first refrigerant flow path. A second refrigerant flow path that short-circuits the condenser and the pressure reducing device, and is provided between the condenser and the inlet of the first refrigerant flow path and the second refrigerant flow path. And a first refrigerant flow path adjusting unit that blocks or switches the refrigerant flow path and the second refrigerant flow path, and the first refrigerant flow path adjusting means causes the first refrigerant to be defrosted during the defrosting operation of the cooler. Shut off the compressor by shutting off the flow path and the second refrigerant flow path. After being heated the cooler, the predetermined time or the cooler has reached a predetermined temperature by the heating means, characterized by opening the second refrigerant passage. Thereby, without increasing the heating amount by a heating means, defrosting time can be shortened and power consumption can be suppressed.

  The second refrigerant is provided between the decompression device from the outlet of the first refrigerant channel and the second refrigerant channel and blocks the first refrigerant channel and the second refrigerant channel. And having a flow path adjusting means, stopping the compressor, and causing the second refrigerant flow path adjusting means to flow the refrigerant from the first refrigerant flow path and the second refrigerant flow path to the cooler. The cooling unit is shut off, and while the cooling unit is being heated, the refrigerant is allowed to flow into the cooling unit for a predetermined time or after the cooling unit reaches a predetermined temperature. Thereby, the cooling of the storage room after defrosting can be shortened by suppressing the heat | fever penetration | invasion to the storage room at the time of defrosting, and power consumption can be suppressed. Moreover, the temperature of the partition part of a refrigerator can be maintained and dew condensation at the time of defrosting can be suppressed.

  Further, the second refrigerant flow path is opened and a predetermined amount of the refrigerant is introduced, and then the first refrigerant flow path is opened to raise the temperature of the upper part of the cooler. As a result, since the refrigerant flows into the cooler without passing through the first refrigerant flow path, heat intrusion into the warehouse is prevented, and the refrigerant is not cooled by the heat in the warehouse, and the refrigerant is cooled at a high temperature. Can flow into the vessel.

  In addition, a check valve or a two-way valve is provided at the outlet of the first refrigerant flow path. Thereby, it is possible to prevent the refrigerant from going back and forth between the refrigerant channels of the first refrigerant channel and the second refrigerant channel.

  Further, the predetermined temperature is set near the melting temperature of frost. Thereby, since the temperature of the refrigerant does not change at the melting temperature of the frost, the refrigerant can be defrosted most efficiently by the latent heat of the frost by opening the refrigerant flow path near the melting temperature of the frost.

  Further, the refrigerant remaining in the cooler is recovered after a predetermined time has elapsed after the refrigerant flow path is shut off. Thereby, the temperature of the partition part of a refrigerator can be maintained and dew condensation at the time of defrosting can be suppressed.

  The compressor is stopped, and after a predetermined time has elapsed, the amount of refrigerant remaining in the cooler is adjusted. As a result, the refrigerant flowing into the cooler is maintained at a constant amount, so that the heat of the defrost heater that has been used to warm the refrigerant that has flowed into the cooler can be used for melting the frost on the cooler. The defrosting time can be shortened.

  In addition, a check valve or a two-way valve is provided at the outlet of the first refrigerant flow path. Thereby, it is possible to prevent the refrigerant from going back and forth between the refrigerant flow paths.

  The storage chamber is a refrigeration temperature zone chamber and a refrigeration temperature zone chamber provided in the refrigerator body, and supplies cold air generated by the cooler to the refrigeration temperature zone chamber and the refrigeration temperature zone chamber An internal blower, a refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber, and a refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber, The blower is driven, the compressor is stopped, the refrigerant flow path is shut off, the heating means is driven, the refrigeration temperature zone damper is closed, the refrigeration temperature zone damper is opened, The refrigeration temperature zone chamber is cooled by latent heat of frost in the cooler. Thereby, since the refrigeration temperature zone room can be cooled at the time of defrosting, the power consumption required for cooling the storage room can be suppressed after the normal cooling operation is resumed from the defrosting operation.

  The storage chamber is a refrigeration temperature zone chamber and a refrigeration temperature zone chamber provided in the refrigerator body, and supplies cold air generated by the cooler to the refrigeration temperature zone chamber and the refrigeration temperature zone chamber An internal blower, a refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber, and a refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber, the heating means The cooler is heated at a predetermined time or after the cooler reaches a predetermined temperature, the refrigerant flow path is opened, the refrigeration temperature zone damper is opened, and the refrigeration temperature zone damper is closed. Thus, the internal fan is brought into a stopped state. As a result, it is possible to suppress dew condensation such as the partition portion during defrosting while suppressing power consumption.

  Embodiments of the present invention will be described below with reference to the drawings.

(Overall structure of refrigerator)
First, the overall structure of the refrigerator according to the present invention will be described with reference to FIGS. FIG. 1 is a front view of the refrigerator of the present embodiment. FIG. 2 is a longitudinal sectional view taken along line AA in FIG. FIG. 3 is a front view illustrating a configuration inside the refrigerator, and is a diagram illustrating the arrangement of the cold air duct and the outlet.

  As shown in FIG. 1, from the top of the refrigerator 1, there are a refrigerator compartment 2, an ice making room 3 arranged on the left and right, an upper freezer room 4, a lower freezer room 5, and a vegetable room 6. The front opening of the refrigerating room 2 has refrigerating room doors 2a and 2b which are of double doors (French door) divided into left and right. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are provided with a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a, respectively. ing.

  As shown in FIG. 2, a foamed heat insulating material (foamed polyurethane) is filled and foamed between the outer box 45 and the inner box 46 to form the heat insulating box 10. Thereby, the inside and outside of the refrigerator 1 are thermally insulated. A plurality of vacuum heat insulating materials 25 are mounted between the outer box 45 and the inner box 46. In addition, in FIG. 2, although the vacuum heat insulating material 25 is provided in the rear part of the refrigerator 1, heat insulation performance can further be improved by providing in an upper part or a bottom part.

  The refrigerator compartment 2, the upper freezer compartment 4, and the ice making compartment 3 (see FIG. 1, the ice making compartment 3 is not shown in FIG. 2) are adiabatically partitioned vertically by a heat insulating partition wall 28. The heat insulating partition wall 28 is provided with a vacuum heat insulating material 25. Thereby, the heat insulation performance in the refrigerator compartment 2 which is a refrigeration temperature zone, and the upper freezer compartment 4 and the ice making chamber 3 which are refrigeration temperature zones can be improved, and the cooling efficiency of each storage compartment can be improved. Further, the lower freezer compartment 5 and the vegetable compartment 6 are separated from each other by a heat insulating partition wall 29.

  Inside the refrigerator compartment door 2a, a plurality of door pockets 32, which are storage containers, are provided vertically. In the refrigerator compartment 2, a plurality of shelves 36 are provided in the vertical direction, and are partitioned into a plurality of storage spaces.

  The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 have storage containers that are integrally drawn with the ice making room door 3a, the upper freezing room door 4a, the lower freezing room door 5a, and the vegetable room door 6a, respectively. 3b (not shown), 4b, 5b, 6b are provided.

  As shown in FIGS. 2 and 3, the cooler 7 is provided in a cooler chamber 8 provided behind the lower freezing chamber 5. An internal fan 9 is provided at the upper projection position of the cooler 7. Air cooled by heat exchange with the cooler 7 by the internal blower 9 (hereinafter referred to as “cold air”) is supplied to the refrigerator compartment air duct 11, the vegetable compartment air duct 14 (see FIG. 3), and the upper freezer compartment air. Air is sent to the refrigerator compartment 2, the vegetable compartment 6, the upper freezer compartment 4, the lower freezer compartment 5, and the ice making compartment 3 through the duct 12, the lower freezer compartment air duct 13, and the ice making compartment air duct (not shown). In addition, each ventilation duct is provided in the back of each room | chamber of the refrigerator 1, as shown with the broken line in FIG.

  The amount of cool air blown to each storage room is controlled by opening / closing the refrigeration temperature zone damper 20, the freezing temperature zone damper 50, and the vegetable compartment damper 51. When the refrigerating temperature zone damper 20 is in the open state, the cold air exchanged by the cooler 7 is sent to the refrigerating room from the outlet 2c via the refrigerating room air duct 11 by the internal fan 9. The cold air that has cooled the refrigerator compartment 2 is returned to the lower right side as viewed from the front of the cooler compartment 8 through the refrigerator outlet return duct 16 from the return port 2d provided at the lower rear of the refrigerator compartment 2.

  On the other hand, when the freezing temperature zone damper 50 is in an open state, the ice making chamber air duct (not shown), the upper freezer compartment air duct 12, and the lower freezer compartment air duct 13 are respectively connected to the outlets 3c, 4c, and 5c. Air is blown to the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5. The cold air that has cooled the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 returns to the cooler chamber 8 through the freezing chamber return port 17 provided below the lower portion of the lower freezing chamber 5.

  On the other hand, when the vegetable compartment damper 51 is in an open state, the air is blown from the outlet 6c to the vegetable compartment 6 through the vegetable compartment air duct 14 (see FIG. 3). Return air from the vegetable compartment 6 is returned to the lower left part of the cooler compartment 8 through a vegetable compartment return duct from a vegetable compartment return port (not shown).

  A machine room 19 is provided at the lower rear of the refrigerator 1. In the machine room 19, the compressor 24 and the condensing means 52, the dryer 53, and the refrigerant valve 54 shown in FIG. 4 are accommodated, and are ventilated to the compressor 24 and the condensing means 52 by an outside fan (not shown). Remove heat generated by operation.

  A control board 31 which is a control device is disposed at the upper rear of the refrigerator 1. On / off control and rotation speed control of the compressor 24, control of the refrigeration temperature chamber damper 20, refrigeration temperature chamber damper 50, vegetable chamber damper 51, and the internal fan 9 are controlled by a program installed in the control board 31 in advance. On / off control and rotation speed control, on / off control and rotation speed control of the outside fan 9 are performed.

  The frost adhering to the cooler 7 and the walls of the cooler chamber 8 around it is defrosted by the defrost heater 22 installed below the cooler 7. The defrost water generated by melting the frost by defrosting is dropped on the jar 23 provided at the lower part of the cooler chamber 8 and then disposed above the compressor 24 in the machine chamber 19 through the drain pipe 27. The evaporating dish 21 is stored. Thereby, it evaporates by the heat_generation | fever from the compressor 24 and the condenser which is not shown in figure, and the ventilation by the fan outside a warehouse which is not shown in figure.

  In the present embodiment, isobutane is used as the refrigerant, and the amount of refrigerant enclosed is about 88 g.

(Cooler peripheral structure)
Next, the peripheral structure of the cooler 7 of the refrigerator 1 of the present embodiment will be described with reference to FIG. FIG. 4 is a front view of the periphery of the cooler 7. FIG. 5 is a perspective view of the defrost heater.

  As indicated by the arrows in FIG. 4, the return cold air from the refrigerator compartment 2 flows into the lower right portion as viewed from the front of the cooler compartment 8 through the refrigerator compartment return duct 16. In other words, the cold room return duct 16 is provided so that the return cold air from the cold room 2 flows into the lower part of the cooler 7.

  A cooler temperature sensor 18 is provided on the upper left side of the cooler 7. The defrosting operation is performed by energizing the defrosting heater 22 (the output of the defrosting heater 22 of this embodiment is 160 W). As shown in FIG. 5, the defrost heater 22 is arranged in a spiral shape without contacting the glass tube 22 c, a heater wire (not shown) built in the glass tube 22 c, and the outer periphery of the glass tube. The heat dissipating fins 22b and the upper cover 22a provided to prevent the defrost water from dripping onto the glass tube 22c are provided. Completion of the defrosting operation is determined by the cooler temperature sensor 18.

  The return cold air from the vegetable compartment 6 flows into the cooler compartment 8 from the vegetable compartment return cold air inflow portion 6d in front of the lower left side of the cooler compartment 8 via a vegetable compartment return duct (not shown). In other words, the vegetable room return cold air inflow portion 6d is provided so that the return cold air from the vegetable room 6 flows below the cooler 7.

  In addition, the return cold air that has cooled the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 flows into the cooler chamber 8 through the freezer return port 17 provided at the lower front portion of the cooler chamber 8. . In other words, the freezing chamber return port 17 is provided so that the return cold air that has cooled the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 flows under the cooler 7.

  Next, the refrigeration cycle of Example 1 will be described with reference to FIG. FIG. 6 is a schematic view showing a refrigerant flow path of the refrigerator.

  In FIG. 6, reference numeral 24 denotes a compressor that compresses the refrigerant in the refrigeration cycle. The compressor 24 is installed in the machine room 19 shown in FIG. A condensing means 52 condenses the refrigerant compressed by the compressor 24.

  The condensing means 52 includes a condenser 52 a that is disposed in the machine room 19 and condenses the refrigerant compressed by the compressor 24, a heat radiating pipe 52 b that condenses the refrigerant and prevents dew on the side surface of the refrigerator 1, and refrigerant. And a heat radiating pipe 52c that condenses and prevents the partition 57 from being exposed to dew. In addition, as shown in FIG. 3, the partition part 57 which arrange | positions the heat radiating pipe 52c has the horizontal partition part which partitions the ice making chamber 3, the upper stage freezing room 4, and the lower stage freezing room 5 up and down, the ice making room 3, and the upper stage freezing room. It is comprised with the vertical partition part which partitions 4 into right and left.

  In FIG. 6, 60 is a refrigerant valve (refrigerant flow path adjusting means) that blocks the refrigerant flow path to the decompression device 58 that depressurizes the refrigerant condensed by the condensing means 52. 7 is a cooler for evaporating the refrigerant decompressed by the decompression device 58, and is provided in the cooler chamber 8 shown in FIG.

  A suction pipe 59 is connected from the cooler 7 to the compressor 24. The compressor 24, the condensing means 52, the refrigerant valve 60, the pressure reducing device 58, the cooler 7, and the suction pipe 59 are sequentially connected to constitute a refrigeration cycle.

  Next, the control means at the time of defrosting in Example 1 is demonstrated. FIG. 7 is a time chart illustrating states of the compressor, the defrost heater, and the refrigerant valve in the defrosting of the refrigerator according to the first embodiment. In FIG. 7, the horizontal axis represents time, and the vertical axis represents the temperature of the cooler temperature sensor 18, compressor operation / stop (ON / OFF), defrost heater energization / stop (ON / OFF), refrigerant valve It represents the open / closed state. In FIG. 7, t1, t2, and t3 on the vertical axis indicating the temperature of the cooler are the temperatures of the cooler temperature sensor 18, respectively, t1 is the temperature at the start of defrosting, and t2 is the upper and lower portions of the cooler. The temperature at which the temperature difference occurs, t3 represents the defrosting termination temperature, has a relationship of t1 <t2 <t3, and the temperature change of the cooler is schematically represented.

  The refrigerator is operated, and defrosting is performed so that a lot of frost adheres to the cooler 7 and the cooling efficiency is not lowered. The defrosting start condition shown in FIG. 8 counts the integrated operation time of the refrigerator from the end of the previous defrosting, and starts defrosting when the specified time is reached. After the defrosting start condition is established, the operation of the compressor 24 is stopped, and at the same time, the refrigerant flow path is blocked by the refrigerant valve 60 to prevent the refrigerant from flowing into the cooler 7.

  During normal operation, operation is performed on the high pressure side from the discharge of the compressor 24 to the inlet of the pressure reducing device 58 and on the low pressure side from the outlet of the pressure reducing device 58 to the suction pipe 59. For this reason, when the compressor 24 is stopped, the refrigerant is about to flow from the high pressure side to the low pressure side in order to eliminate the pressure difference, but the refrigerant valve 60 is closed and the refrigerant flow path is shut off. Although the refrigerant up to 7 flows into the cooler 7, since the capacity of the decompression device 58 is small, the refrigerant hardly flows into the cooler 7.

  Then, energization of the defrost heater 22 is started. At this time, since the refrigerant does not flow into the cooler 7, the heat of the defrost heater 22 that has been used to warm the refrigerant that has flowed into the cooler 7 can be used as the heat that melts the frost on the cooler 7. The frost time can be shortened. Further, since the refrigerant flow path is blocked by the refrigerant valve 60, the pressure of the heat radiating pipes 52b and 52c does not change, and there is no temperature drop due to the pressure drop. For this reason, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  Then, when the cooler temperature sensor 18 reaches a predetermined temperature or the defrost heater 22 is energized for a predetermined time or longer, the refrigerant valve 60 is opened and the refrigerant flow path is released. For this reason, the refrigerant flows into the cooler 7 in order to eliminate the pressure difference between the front and rear of the refrigerant valve 60 held by the refrigerant valve 60. At this time, the pressure of the cooler 7 rises due to the refrigerant flowing into the cooler 7 on the low pressure side, the temperature of the cooler 7 rises, and the temperature of the cooler 7 rises due to the flow of the high-temperature refrigerant relative to the cooler 7. Therefore, the defrosting time can be shortened. In addition, if the time which interrupts | blocks a refrigerant | coolant flow path is long, the time which can utilize the heat of the defrost heater 22 conventionally utilized for warming the refrigerant | coolant which flowed in the cooler 7 to the heat which melts the frost attached to the cooler 7 is used. Although it becomes longer, the temperature rise of the cooler 7 due to the flow of the high-temperature refrigerant decreases. Since the refrigerant temperature does not change at the frost melting temperature, the most efficient defrosting can be achieved by opening the refrigerant flow path in the vicinity of the frost melting temperature.

  Then, when the cooler temperature sensor 18 reaches a specified temperature at which the defrosting is completed, the energization of the defrosting heater 22 is stopped, the operation of the compressor 24 is resumed, and the operation returns to the operation for cooling the normal storage chamber. . The predetermined temperature at which the refrigerant valve 60 is opened and the refrigerant flow path is released, the defrosting heater energizing time, and the predetermined temperature at which the defrosting is finished depend on the compressor capacity, the amount of enclosed refrigerant, the air path configuration, the storage chamber capacity, etc. Because it differs, it is set in advance by testing. Moreover, although the compressor 24 and the refrigerant | coolant valve 54 are operated simultaneously at the time of a defrost start, a time difference and an order may change in the range which has no influence.

  Therefore, the defrost time can be shortened without increasing the energization amount of the defrost heater 22, and the power consumption can be suppressed. Moreover, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  Next, FIG. 8 is a flowchart showing the defrosting control of the first embodiment. In FIG. 8, STEP 101 is a step for normal cooling operation, STEP 102 is a step for determining whether a defrosting start condition is satisfied, STEP 103 is a step for closing the refrigerant valve 60 and shutting off the refrigerant flow path, and STEP 104 is a compressor. 24, a step 105 for starting energization of the defrost heater 22, a step 106 for determining whether or not the cooler temperature sensor 18 has reached the temperature t2, and a STEP 107 for determining whether the defrost heater energization time is the specified time Tlimit1. STEP 108 is a step of opening the refrigerant valve 60 and releasing the refrigerant flow path. STEP 109 is a step of determining whether or not the temperature t3 at which the cooler temperature sensor 18 finishes defrosting is reached. STEP 110 Is the step of ending energization of the defrost heater 22, ST P111 is a step of restarting the compressor 24.

  STEP 101 is a normal cooling operation step. Based on the state of the refrigerator 1 detected by an outside air temperature sensor, a refrigeration temperature zone chamber sensor, a freezing temperature zone chamber sensor, a vegetable compartment sensor or the like (not shown), the compressor 24 and the internal fan 9 are provided. The normal cooling operation for controlling the temperature of each storage room is performed by turning on / off the refrigeration temperature zone damper 20, the freezing temperature zone damper 50, and the vegetable compartment damper 51.

  STEP 102 is a step for determining whether or not the defrosting start condition is satisfied. The integrated operation time of the refrigerator is counted from the end of the previous defrosting, and it is assumed that the defrosting start condition is satisfied when the predetermined time is reached. When the defrost opening condition is not satisfied, the routine returns to STEP 101, the normal cooling operation is performed, and the defrost start condition is determined again in STEP102. When the defrosting start condition is satisfied, the refrigerant valve 60 is closed and the refrigerant flow path is shut off in STEP 103, and the operation of the compressor 24 is stopped in STEP 104. The integrated operation time of the refrigerator differs depending on the number of times the door is opened and closed, the time, the outside temperature, and the like.

  In step 105, energization of the defrost heater 22 is started, and the frost attached to the cooler 7 is melted. STEP 106 is a step for determining whether or not the cooler temperature sensor 18 has reached the predetermined temperature t2. When the cooler temperature sensor 18 has reached the predetermined temperature t2, the refrigerant valve 60 is opened in STEP 108 and the refrigerant flow path is released. If the cooler temperature sensor 18 has not reached the predetermined temperature t2, it is determined in STEP 107 whether the defrost heater energizing time Tlimit1 has been reached. If the defrost heater energizing time has reached Tlimit1, the refrigerant valve 60 is determined in STEP 108. To open the refrigerant flow path. If the defrost heater energization time has not reached Tlimit1, the process returns to STEP 106 to determine whether the cooler temperature sensor 18 has reached the predetermined temperature t2.

  Then, in STEP 109, it is determined whether or not the cooler temperature sensor 18 has reached a predetermined temperature t3 at which defrosting is completed. If not, it is repeatedly determined in STEP 109 whether or not the predetermined temperature t3 has been reached. When the predetermined temperature t3 is reached, energization of the defrosting heater is terminated in STEP 110, the compressor is restarted in STEP 111, and the normal cooling operation is returned in STEP 101.

  Note that STEP 103, STEP 104, and STEP 105 may be simultaneous, or the order may be changed with a time difference that has no influence. Further, the order of STEP 106 and STEP 107 may be changed.

  Thus, by providing the step of stopping the compressor 24 and the step of closing the refrigerant valve 60 and blocking the refrigerant flow path, the refrigerant does not flow into the cooler 7 but flows into the conventional cooler 7. The heat of the defrosting heater that has been used to warm the heat can be used for the heat that melts the frost on the cooler 7, the refrigerant valve 60 is opened in STEP 108, and the refrigerant flow path is released, so that the refrigerant is cooled by the cooler 7. The pressure of the cooler 7 rises, the temperature of the cooler 7 rises, and the temperature of the cooler 7 rises due to the flow of high-temperature refrigerant into the cooler 7. Therefore, the defrost time can be shortened without increasing the energization amount of the defrost heater 22, and the power consumption can be suppressed.

  Next, the refrigeration cycle of Example 2 will be described with reference to FIG. FIG. 9 is a schematic view showing the refrigerant flow path of the refrigerator.

  Reference numeral 55 denotes a short-circuit pipe (second refrigerant flow path) connecting the heat radiating pipe 52b and the decompression device 58. Reference numeral 54 denotes a refrigerant valve (first refrigerant flow path adjusting means) that blocks or switches between the heat radiating pipe 52c (first refrigerant flow path) and the short-circuit pipe 55 (second refrigerant flow path). 56 is a check valve provided at the refrigerant flow path outlet (the outlet of the heat radiating pipe 52c (first refrigerant flow path)) in order to prevent refrigerant from flowing back and forth between the refrigerant flow paths of the heat radiating pipe 52c and the short-circuit pipe 55. It is. The other reference numerals are the same as those in the first embodiment, and the same reference numerals are given and the description thereof is omitted.

  The control means at the time of defrosting in Example 2 will be described. FIG. 10 is a time chart showing states of the compressor, the defrost heater, and the refrigerant valve in the defrosting of the refrigerator showing the control of the second embodiment. In FIG. 10, the horizontal axis represents time, and the vertical axis represents the temperature of the cooler temperature sensor 18, the operation / stop (ON / OFF) of the compressor, the energization / stop (ON / OFF) of the defrost heater, and the refrigerant valve. This represents a state in which the heat radiating pipe 52c (first refrigerant flow path) side, the short circuit pipe 55 (second refrigerant flow path) side, and the fully closed state. In the figure, t1, t2, and t3 on the vertical axis indicating the temperature of the cooler are the same as those in the first embodiment, and thus description thereof is omitted.

  The refrigerator is operated, and defrosting is performed so that a lot of frost adheres to the cooler 7 and the cooling efficiency is not lowered. The defrosting start condition shown in FIG. 10 counts the integrated operation time of the refrigerator from the end of the previous defrosting, and starts defrosting when it reaches a predetermined time. After the defrosting start condition is satisfied, the refrigerant flow path is shut off by the refrigerant valve 54, and the operation of the compressor 24 is stopped after a certain period of time. Remove the amount.

  Even if the refrigerant flow path is shut off by the refrigerant valve 54, the compressor 24 is operated, so that the low-pressure side refrigerant from the refrigerant valve 54 to the suction pipe 59 is collected on the high-pressure side from the discharge of the compressor 24 to the refrigerant valve 54. It is done. For this reason, the refrigerant | coolant which remains in the cooler 7 can be adjusted by stopping the compressor 24 after fixed time progress. In addition, when the time from the refrigerant flow path shutoff to the compressor 24 stop is short or when the refrigerant flow path is shut off simultaneously with the compressor stop as in the first embodiment, the refrigerant of the heat radiating pipe 52c and the short-circuit pipe 55 is transferred to the cooler 7. Inflow.

  Since the effect obtained by blocking the refrigerant flow path is the same as that of the first embodiment, the description thereof is omitted.

  Then, when the cooler temperature sensor 18 reaches a predetermined temperature or the defrost heater 22 is energized for a predetermined time or longer, the refrigerant valve 54 is opened to the short-circuit pipe 55 side, and the short-circuit pipe 55 is released. For this reason, the refrigerant flows into the cooler 7 in order to eliminate the pressure difference between the front and rear of the refrigerant valve 54 held by the refrigerant valve 54. At this time, since the pressure of the cooler 7 rises due to the refrigerant flowing into the cooler 7 on the low pressure side, the temperature rises, and the temperature of the cooler 7 rises due to the high-temperature refrigerant flowing into the cooler 7, so the defrosting time Can be shortened. Moreover, since it does not pass through the heat radiating pipe 52c, it is possible to prevent heat from entering the inside of the cabinet, and since the refrigerant is not cooled by the heat inside the cabinet, the refrigerant can flow into the cooler 7 at a high temperature.

  When the cooler temperature sensor 18 reaches the specified temperature at which the defrosting is finished, the defrosting heater 22 is deenergized, the refrigerant valve 54 is opened to the side of the heat radiating pipe 52c, and the operation of the compressor 24 is resumed. Return to normal cooling operation. Moreover, although the compressor 24, the defrost heater 22, and the refrigerant | coolant valve 54 are operated simultaneously at the time of a defrost start, a time difference and an order may change in the range which has no influence.

  Therefore, the defrosting time can be shortened without increasing the energization amount of the defrosting heater 22, and the cooling of the storage chamber after the defrosting is shortened by suppressing the heat intrusion into the storage chamber during the defrosting. This can reduce power consumption. Moreover, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  FIG. 11 is a flowchart showing the defrosting control of the second embodiment. In FIG. 11, STEP 212 is a step in which the refrigerant valve 54 is fully closed to shut off the refrigerant flow path, and STEP 213 is to fully close the refrigerant valve 54 and remove the refrigerant remaining in the cooler 7 for the time after the refrigerant flow path is cut off. Step 214 for determining whether or not the predetermined time Tlimit2 has been reached, STEP 214 is a step in which the refrigerant valve is opened on the short-circuit pipe 55 side, only the short-circuit pipe 55 is opened in the refrigerant flow path, and STEP 215 is a step in which the refrigerant valve 54 is opened on the heat radiation pipe 52c side. is there. Since STEP 201 to STEP 211 are the same as STEP 101 to STEP 111 of the first embodiment, description thereof is omitted.

  When the defrosting start condition is satisfied, the refrigerant valve 54 is fully closed in STEP 212 and the refrigerant flow path is shut off. STEP 213 is a step in which the refrigerant valve 54 is fully closed and the time after the refrigerant flow path is shut off is a step for determining whether the predetermined time Tlimit2 is reached for removing the refrigerant remaining in the cooler 7. If the predetermined time Tlimit2 has not been reached, the determination whether or not the predetermined time Tlimit2 has been reached is repeated in STEP 204. If the predetermined time Tlimit2 is reached, the operation of the compressor 24 is stopped in STEP205.

  If the cooler temperature sensor 18 reaches the predetermined temperature t2 in STEP 206 or the defrost heater energization time reaches Tlimit1 in STEP 207, the refrigerant valve 54 is opened on the short-circuit pipe 55 side in STEP 214, and only the short-circuit pipe 55 is supplied with refrigerant. Free the road.

  When the cooler temperature sensor 18 reaches the predetermined temperature t3 in STEP 209, the refrigerant valve 54 is opened on the heat radiating pipe 52c side in STEP 215.

  As described above, the step of determining whether or not the predetermined time Tlimit2 for removing the refrigerant remaining in the cooler 7 has been reached allows the amount of refrigerant remaining in the cooler 7 to be adjusted. In addition, since the step of releasing the refrigerant flow path only for the short-circuit pipe 55 is provided, it does not pass through the heat radiating pipe 52c, so that heat can be prevented from entering the cabinet, and the refrigerant is not cooled by the heat in the cabinet. The refrigerant can be allowed to flow into the cooler 7 at a high temperature. Therefore, the defrost time can be shortened without increasing the energization amount of the defrost heater, and the power consumption can be suppressed.

  Next, the refrigeration cycle of Example 3 will be described with reference to FIG.

  In FIG. 12, 54a is a refrigerant valve (first refrigerant flow path adjusting means) that shuts off and switches between the heat radiating pipe 52c and the short-circuit pipe 55, and 54b is a refrigerant to the pressure reducing device 58 that depressurizes the refrigerant condensed by the condensing means. A refrigerant valve (second refrigerant flow path adjusting means) that blocks the flow path. Other reference numerals are the same as those in the first embodiment, and a description thereof will be omitted.

  The defrosting control means in Embodiment 3 will be described. FIG. 13 is a time chart showing states of the compressor, the defrost heater, the first refrigerant flow path adjusting means, and the second refrigerant flow path adjusting means in the defrosting of the refrigerator showing the control of the third embodiment. In FIG. 13, the horizontal axis represents time, and the vertical axis represents the temperature of the cooler temperature sensor 18, the operation / stop (ON / OFF) of the compressor, the energization / stop of the defrost heater (ON / OFF), and the refrigerant valve 54a. , The heat release pipe 52c side, the short circuit pipe 55 side, the fully closed state, and the open / closed state of the refrigerant valve 54b. In the figure, t1, t2, and t3 on the vertical axis indicating the temperature of the cooler are the same as those in the first embodiment, and thus description thereof is omitted.

  In FIG. 13, after the defrosting start condition is satisfied, the operation of the compressor 24 is stopped, and at the same time, the refrigerant valve 54 a and the refrigerant valve 54 b are fully closed, thereby blocking the refrigerant flow path and thereby supplying the refrigerant to the cooler 7. To prevent inflow.

  During normal operation, operation is performed on the high pressure side from the discharge of the compressor 24 to the inlet of the pressure reducing device 58 and on the low pressure side from the outlet of the pressure reducing device 58 to the suction pipe 59. For this reason, when the compressor 24 is stopped, the refrigerant tries to flow from the high pressure side to the low pressure side in order to eliminate the pressure difference, but the refrigerant valve 54a and the refrigerant valve 54b are fully closed and the refrigerant flow path is shut off. The refrigerant from the refrigerant valve 54 b to the cooler 7 flows into the cooler 7, but since the capacity of the decompression device 58 is small, the refrigerant hardly flows into the cooler 7. Further, since the refrigerant valve 54a is fully closed, the refrigerant does not flow out of the heat radiating pipe 52c, and the refrigerant can be kept in the condenser 52a and the heat radiating pipe 52b while maintaining a high temperature.

  Since the effect obtained by blocking the refrigerant flow path is the same as that of the first embodiment, the description thereof is omitted.

  When the cooler temperature sensor 18 reaches a predetermined temperature or the defrost heater 22 is energized for a predetermined time or longer, the refrigerant valve 54a is opened on the short-circuit pipe 55 side, the refrigerant valve 54b is opened, and the refrigerant flow path is released. For this reason, the refrigerant flows into the cooler 7 so as to eliminate the pressure difference between the front and rear of the refrigerant valve 54b held by the refrigerant valve 54b. Hereinafter, since it is the same as that of Example 2, description is abbreviate | omitted. In addition, although the compressor 24, the defrost heater 22, the refrigerant | coolant valve 54a, and the refrigerant | coolant valve 54b are operated simultaneously at the time of a defrost start, a time difference and an order may change in the range which is not influenced.

  Accordingly, the defrosting time can be shortened without increasing the energization amount of the defrost heater, and the cooling of the storage chamber after defrosting can be shortened by suppressing the heat intrusion into the storage chamber during the defrosting. Power consumption can be reduced. Moreover, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  FIG. 14 is a flowchart showing the defrosting control of the third embodiment. In the drawing, STEP 316 is a step in which the refrigerant valve 54 a is fully closed in STEP 312 and at the same time the refrigerant valve 54 b is closed and the refrigerant flow path to the decompression device 58 is shut off. STEP 317 is a step of opening the refrigerant flow path to the decompression device 58 by opening the refrigerant valve 54b at the same time as opening the refrigerant valve 54a on the short-circuit pipe 55 side in STEP 314. Since STEP 301 to STEP 315 are the same as STEP 201 to STEP 215 of the first embodiment, description thereof is omitted.

  When the defrosting start condition is satisfied in STEP 302, the refrigerant valve 54a is fully closed in STEP 312, and at the same time, the refrigerant valve 54b is closed and the refrigerant flow path to the decompression device 58 is shut off. In STEP 314, the refrigerant valve 54a is opened to the short-circuit pipe 55 side, and only the short-circuit pipe 55 releases the refrigerant flow path. At the same time, the refrigerant valve 54b is opened to open the refrigerant flow path to the decompression device 58. Note that STEP 312 and STEP 316, STEP 314 and STEP 317 may be simultaneous, or the order may be changed with a time difference that has no effect.

  In this way, the refrigerant valve 54a is fully closed, the refrigerant valve 54b is closed at the same time, the refrigerant flow path to the decompression device 58 and the cooler 7 is shut off, and the refrigerant valve 54a is opened on the short-circuit pipe 55 side. At the same time, the same effect as in the second embodiment can be obtained by providing the step of opening the refrigerant valve 54b and opening the refrigerant flow path to the decompression device 58 and the cooler 7.

  Next, the refrigeration cycle of Example 4 will be described with reference to FIG. In FIG. 15, 54 c is a refrigerant that blocks the refrigerant flow path to the decompression device 58 that depressurizes the refrigerant condensed by the condenser and prevents the refrigerant from going back and forth between the heat radiation pipe 52 c and the short-circuit pipe 55. It is a valve (two-way valve). Other reference numerals are the same as those in the first embodiment, and the description thereof is omitted.

  The defrosting control means in Embodiment 4 will be described. Since the control of the compressor, the defrost heater, the refrigerant valve 54a, and the refrigerant valve 54c (the check valve 56 in the second embodiment) is the same as that in the second embodiment, the description thereof is omitted.

  During normal operation, operation is performed on the high pressure side from the discharge of the compressor 24 to the inlet of the pressure reducing device 58 and on the low pressure side from the outlet of the pressure reducing device 58 to the suction pipe 59. For this reason, when the compressor 24 is stopped, the refrigerant tries to flow from the high pressure side to the low pressure side in order to eliminate the pressure difference, but the refrigerant valve 54a and the refrigerant valve 54c are fully closed and the refrigerant flow path is shut off. The refrigerant from the refrigerant flow path of the short-circuit pipe 55 and the refrigerant valve 54c to the cooler 7 flows into the cooler 7, but the capacity of the short-circuit pipe 55 is small compared to the heat radiation pipe 52c and the capacity of the decompression device 58 is small. Therefore, only a small amount of refrigerant flows into the cooler 7. Further, since the refrigerant valve 54a is fully closed, the refrigerant does not flow into the heat radiating pipe 52c, and the refrigerant can be kept in the condenser 52a and the heat radiating pipe 52b while maintaining a high temperature. Note that the amount of refrigerant flowing into the cooler 7 may be adjusted by fully closing the refrigerant valve 54a and the refrigerant valve 54c before the compressor is stopped as in the second embodiment. Since other controls and effects are the same as those in the second embodiment, description thereof is omitted.

  Next, the refrigeration cycle of Example 5 will be described with reference to FIG. In FIG. 16, 61 is a refrigerant valve (refrigerant flow path adjusting means) capable of switching the connection between the inlet and outlet of the heat radiating pipe 52c, the outlet of the heat radiating pipe 52b, and the decompression device 58. Other reference numerals are the same as those in the first embodiment, and the description thereof is omitted.

  The defrosting control means in Embodiment 5 will be described. FIG. 17 is a time chart showing states of the compressor, the defrost heater, and the refrigerant valve 61 in the defrosting of the refrigerator showing the control of the fifth embodiment. In FIG. 16, the horizontal axis represents time, and the vertical axis represents the temperature of the cooler temperature sensor 18, compressor operation / stop (ON / OFF), defrost heater energization / stop (ON / OFF), and refrigerant valve 61. The A-B side connecting the outlet of the heat dissipation pipe 52b and the inlet of the heat-dissipating pipe 52c, connecting the outlet of the heat-dissipating pipe 52c and the pressure reducing device, the A-C side connecting the outlet of the heat-dissipating pipe 52c and the outlet, and connecting the outlet of the heat-dissipating pipe 52b and the pressure-reducing device, It represents a fully closed state. In the figure, t1, t2, and t3 on the vertical axis indicating the temperature of the cooler are the same as those in the first embodiment, and thus description thereof is omitted.

  In FIG. 16, after the defrosting start condition is satisfied, the operation of the compressor 24 is stopped, and at the same time, the refrigerant valve 61 is fully closed to block the refrigerant flow path, thereby preventing the refrigerant from flowing into the cooler 7. .

  Since the effect obtained by blocking the refrigerant flow path is the same as that of the first embodiment, the description thereof is omitted.

  When the cooler temperature sensor 18 reaches a predetermined temperature or the defrost heater 22 is energized for a predetermined time or longer, the refrigerant valve 61 is opened on the AC side, and the refrigerant flow path is released. For this reason, the refrigerant flows into the cooler 7 in order to eliminate the pressure difference between the front and rear of the refrigerant valve 61 held by the refrigerant valve 61. Since the effect of the refrigerant flowing in is the same as that of the second embodiment, the description thereof is omitted.

  When the cooler temperature sensor 18 reaches a predetermined temperature at which the defrosting is completed, the defrosting heater 22 is deenergized, the refrigerant valve 61 is opened on the AB side, and the operation of the compressor 24 is resumed. Return to normal cooling operation. Moreover, although the compressor 24, the defrost heater 22, and the refrigerant | coolant valve 61 are operated simultaneously at the time of a defrost start, a time difference and an order may change in the range which has no influence. Hereinafter, since it is the same as that of Example 2, description is abbreviate | omitted.

  Accordingly, the defrosting time can be shortened without increasing the energization amount of the defrost heater, and the cooling of the storage chamber after defrosting can be shortened by suppressing the heat intrusion into the storage chamber during the defrosting. Power consumption can be reduced. Moreover, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  FIG. 18 is a flowchart illustrating the defrosting control according to the fifth embodiment. In the figure, STEP 512 is a step in which the refrigerant valve 61 is fully closed and the refrigerant flow path to the decompression device 58 is blocked. STEP 514 is a step in which the refrigerant valve 54 is opened on the AC side and the refrigerant flow path to the decompression device 58 is opened. STEP 515 is a step in which the refrigerant valve 54 is opened on the AB side and the refrigerant flow path of the heat radiating pipe 52c is opened. STEP 501 to STEP 511 are the same as STEP 101 to STEP 111 of the first embodiment, and a description thereof will be omitted.

  Next, Example 6 will be described. Note that the refrigeration cycle of Example 6 is the same as that of Example 2, and thus the description thereof is omitted.

  First, the defrosting control means of the refrigerator of Example 6 will be described. FIG. 19 is a time chart showing states of the compressor, the defrost heater, the internal fan, the refrigeration temperature zone chamber damper, the freezing temperature zone chamber damper, and the refrigerant valve in the defrosting of the refrigerator of the embodiment showing the control of the embodiment 6. It is.

  In FIG. 19, the horizontal axis represents time, and the vertical axis represents the temperature of the cooler temperature sensor 18, compressor operation / stop (ON / OFF), defrost heater energization / stop (ON / OFF), and internal fan. ON / OFF, refrigeration temperature zone chamber damper open / close, refrigeration temperature zone chamber damper open / close, refrigerant valve 54 radiating pipe 52c side, short circuit pipe 55 side, fully closed. In the figure, t1, t2, and t3 on the vertical axis indicating the temperature of the cooler are the same as those in the first embodiment, and thus description thereof is omitted. Further, since the process until the compressor is stopped is the same as that of the second embodiment, the description thereof is omitted.

  After the compressor is stopped, the refrigeration temperature zone chamber damper 50 is closed, the refrigeration temperature zone chamber damper 20 is opened, and the defrost heater 22 is energized while the internal fan 9 is energized. At this time, since the refrigeration temperature zone chamber damper 20 is open in a state where the internal fan 9 is energized, the frost attached to the cooler 7 is used while melting the frost attached to the cooler 7, The refrigerator compartment 2 can be cooled. Since the effect of the refrigerant control is the same as that of the second embodiment, the description thereof is omitted.

  When the cooler temperature sensor 18 reaches a predetermined temperature or the defrost heater 22 is energized for a predetermined time or longer, the energization of the internal fan 9 is stopped, the refrigeration temperature chamber damper 50 is opened, and the refrigeration temperature chamber damper 20 is opened. The refrigerant valve 54 is opened on the short-circuit pipe 55 side, and the refrigerant flow path is released. Since the effect of the refrigerant flowing in is the same as that of the second embodiment, the description thereof is omitted.

  When the cooler temperature sensor 18 reaches a specified temperature at which the defrosting is completed, the defrosting heater 22 is deenergized, the refrigerant valve 54 is opened on the heat radiation pipe 52c side, and the refrigeration temperature chamber damper 50 is closed. Then, the refrigeration temperature zone chamber damper is opened, energization of the internal fan is started, the operation of the compressor 24 is resumed, and the operation returns to the operation for cooling the normal storage chamber. At the start of defrosting, the compressor 24, the refrigerant valve 54, the refrigeration temperature zone chamber damper 20, the refrigeration temperature zone chamber damper 50, and the defrosting heater are operated at the same time, but the time difference and order change within a range that is not affected. May be.

  Therefore, the defrosting time can be shortened without increasing the energization amount of the defrosting heater, and the refrigerator compartment 2 at the time of defrosting can be cooled, so that the power consumption can be suppressed. Moreover, the temperature of the side surface of the refrigerator 1 and the partition part 57 can be maintained, and dew condensation at the time of defrosting can be suppressed.

  FIG. 20 is a flowchart illustrating the defrosting control according to the sixth embodiment. In the figure, STEP 616 is a step for closing the freezing temperature zone chamber damper 50, STEP 617 is a step for opening the refrigeration temperature zone chamber damper 20, STEP 618 is a step for stopping the internal fan 9, and STEP 619 is a refrigeration temperature zone chamber damper 20. Step 620 is a step for opening the refrigeration temperature chamber damper 50, STEP 621 is a step for closing the refrigeration temperature chamber damper 50, STEP 622 is a step for opening the refrigeration temperature chamber damper 20, and STEP 623 is This is a step of restarting energization of the internal fan 9. Since STEP601 to STEP615 are the same as STEP201 to STEP215 of the first embodiment, description thereof is omitted.

  After stopping the compressor in STEP 604, the refrigeration temperature zone damper 50 is closed in STEP 616, and the refrigeration temperature zone damper 20 is opened in STEP 617. At this time, since the internal fan 9 is energized, the refrigeration chamber 2 can be cooled using the frost attached to the cooler 7 while melting the frost attached to the cooler 7.

  In STEP 614, the refrigerant valve 54 is opened on the short-circuit pipe 55 side, the internal fan is stopped in STEP 618, the refrigeration temperature zone damper 20 is closed in STEP 619, and the refrigeration temperature zone damper 50 is opened in STEP 620. .

  Further, after the defrosting heater energization is stopped in STEP 610, the freezing temperature zone chamber damper 50 is closed in STEP 621, the refrigeration temperature zone chamber damper 20 is opened in STEP 622, and energization of the internal fan 9 is resumed in STEP 623. Note that STEP 604, STEP 616, STEP 617, and STEP 605 may be simultaneous, or the order may be changed with a time difference that has no effect. The same applies to STEP618 to STEP620. The same applies to STEP 610, STEP 615, STEP 611, and STEP 621 to STEP 623.

  Thus, the refrigerator compartment 2 at the time of defrosting can be cooled by providing the energization of the internal fan, opening / closing of the refrigeration temperature zone damper 20 and opening / closing of the refrigeration temperature zone damper 50. Since the effect of the refrigerant control is the same as that of the second embodiment, the description thereof is omitted. Therefore, the defrost time can be shortened without increasing the energization amount of the defrost heater, and the power consumption can be suppressed.

7 Cooler 9 Fan in the cabinet (Blower in the cabinet)
18 Cooler temperature sensor 20 Refrigeration temperature zone damper 22 Defrost heater (heating means)
24 Compressor 50 Refrigeration temperature zone damper 52 Condensing means 52a Condenser 52b Heat radiation pipe 52c Heat radiation pipe (first refrigerant flow path)
54, 54a Refrigerant valve (three-way valve, first refrigerant flow path adjusting means)
54b Refrigerant valve (two-way valve, second refrigerant flow path adjusting means)
54c Refrigerant valve (two-way valve)
55 Short-circuit pipe (second refrigerant flow path)
56 Check valve 57 Partition 58 Pressure reducing device 59 Suction pipe 60 Refrigerant valve (two-way valve, refrigerant flow path adjusting means)
61 Refrigerant valve (four-way valve, refrigerant flow path adjusting means)

Claims (10)

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed by the compressor;
A decompression device for decompressing the refrigerant condensed by the condenser;
A cooler for evaporating the refrigerant decompressed by the decompression device;
Heating means for heating the cooler;
In the refrigerator having a refrigerant flow path adjusting means for blocking the refrigerant flow path,
During the defrosting operation of the cooler, the refrigerant flow path adjusting means shuts off the refrigerant flow path, stops the compressor, and the heating means is heating the cooler for a predetermined time or when the cooler is The refrigerator is characterized in that the refrigerant flow path is opened after reaching a predetermined temperature. A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed by the compressor;
A decompression device for decompressing the refrigerant condensed by the condenser;
A cooler for evaporating the refrigerant decompressed by the decompression device;
A refrigerator having heating means for heating the cooler,
A first refrigerant flow path for heating the front part of the partition part of the storage chamber;
A second refrigerant flow path provided in parallel with the first refrigerant flow path to short-circuit the condenser and the decompression device;
A first refrigerant flow path provided between the condenser and the inlet of the first refrigerant flow path and the second refrigerant flow path to block or switch the first refrigerant flow path and the second refrigerant flow path. Adjusting means,
During the defrosting operation of the cooler, the first refrigerant flow path adjustment means shuts off the first refrigerant flow path and the second refrigerant flow path, stops the compressor, and the heating means The refrigerator is characterized in that the second refrigerant flow path is opened for a predetermined time or after the cooler reaches a predetermined temperature while heating the cooler. A second refrigerant flow path that is provided between the decompression device from an outlet of the first refrigerant flow path and the second refrigerant flow path and blocks the first refrigerant flow path and the second refrigerant flow path. Adjustment means,
The compressor is stopped, the second refrigerant flow path adjusting means blocks the flow of the refrigerant from the first refrigerant flow path and the second refrigerant flow path to the cooler, and the heating means 3. The refrigerator according to claim 2, wherein the refrigerant is allowed to flow into the cooler for a predetermined time or after the cooler reaches a predetermined temperature while the cooler is being heated.   The temperature of the upper part of the cooler is increased by opening the second refrigerant flow path and allowing the refrigerant to flow in, and then opening the first refrigerant flow path. 2. The refrigerator according to 2.   The refrigerator according to claim 2, wherein a check valve or a two-way valve is provided at the outlet of the first refrigerant flow path.   The refrigerator according to claim 1 or 2, wherein the predetermined temperature is in the vicinity of a melting temperature of frost.   The refrigerator according to claim 1, wherein the refrigerant remaining in the cooler is recovered after a predetermined time has elapsed after the refrigerant flow path is shut off.   The refrigerator according to claim 1, wherein the amount of refrigerant remaining in the cooler is adjusted after the compressor is stopped and a predetermined time elapses. The storage room is a refrigeration temperature zone room and a freezing temperature zone room provided in the refrigerator body,
An internal fan that supplies cold air generated by the cooler to the refrigeration temperature zone chamber and the freezing temperature zone chamber;
A refrigerated temperature zone damper for adjusting the amount of cold air supplied to the refrigerated temperature zone;
A refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber,
The internal fan is driven, the compressor is stopped, the refrigerant flow path is shut off, the heating means is driven, the refrigeration temperature zone damper is closed, and the refrigeration temperature zone damper is opened. The refrigerator according to claim 1, wherein the refrigerator temperature zone is cooled by latent heat of frost of the cooler. The storage room is a refrigeration temperature zone room and a freezing temperature zone room provided in the refrigerator body,
An internal fan that supplies cold air generated by the cooler to the refrigeration temperature zone chamber and the freezing temperature zone chamber;
A refrigerated temperature zone damper for adjusting the amount of cold air supplied to the refrigerated temperature zone;
A refrigeration temperature zone chamber damper for adjusting the amount of cold air supplied to the refrigeration temperature zone chamber, and heating the cooler with the heating means, and after the cooler has reached a predetermined temperature, The refrigerator according to claim 1, wherein the refrigerant flow path is opened, the refrigeration temperature zone chamber damper is opened, the refrigeration temperature zone chamber damper is closed, and the internal fan is stopped. .