JP5571044B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator, and more particularly to a defrosting operation of a refrigerator.

  An example of a conventional refrigerator is described in Patent Document 1. In the refrigerator described in this publication, a heat absorber connected to the cooler by piping is provided in a non-freezing area (for example, a refrigerator room, a vegetable room, or a machine room). At the time of defrosting, the antifreeze liquid filled in the heat absorber is circulated by a circulation pump and used as a heat source for the cooler. Thereby, the power consumption at the time of defrosting is reduced. Moreover, the electric heater (defrost heater) generally used is omitted by utilizing the heat source stored in the heat absorber. Thus, it is described that defrosting with reduced power consumption than before can be carried out without temporarily raising the temperature inside the warehouse.

  Another example of a conventional refrigerator is described in Patent Document 2. In the refrigerator described in this gazette, when the exhaust heat of the refrigeration cycle radiator or compressor motor is stored in antifreeze liquid or oil, and the conventional electric heater (defrost heater) is used by utilizing this stored heat during defrosting Compared to the power consumption is reduced. The heat storage in the antifreeze and oil is transmitted to the cooler via a heat pipe and a circulation pump and used for defrosting.

  Another example of a conventional refrigerator is described in Patent Document 3. In the refrigerator described in this publication, in addition to the generally used defrost heater, waste heat generated from the compressor during the operation period of the refrigeration cycle is stored in antifreeze and used to remove frost attached to the evaporator. doing.

JP 2009-92371 A JP 59-81479 A Japanese Patent Laid-Open No. 11-23135

  In the refrigerator described in Patent Document 1, a tank is provided in a non-freezing region in order to heat frost (heats a cooler) with a small amount of energy, and energy necessary for defrosting is stored in an antifreeze filled in the tank. Yes. Thereby, the electric heater conventionally used in the defrosting is not required, and the power consumption can be greatly reduced. Here, a non-freezing area | region is a refrigerator compartment, a vegetable compartment, and a machine room (compressor installation part), for example. In the refrigerator described in this publication, an antifreeze liquid of 0 ° C. or higher is required to defrost frost. Therefore, the heat absorber filled with the antifreeze liquid needs to be installed in a temperature range of at least the freezing point or higher.

However, the average temperature of the refrigerator compartment and vegetable compartment is about 5 ° C., and it is not easy to secure the amount of heat stored in the antifreeze liquid, and it is difficult to obtain a sufficient amount of heat necessary for defrosting. For example, when general brine (main component: ethylene glycol) is used as the antifreeze, the concentration is 70 Wt% (freezing temperature -40 ° C), specific heat 2.891 kJ / (kgK), density about 1110 kg / m ^3, and normal cooling Estimating the amount of antifreeze liquid required to defrost 0.1 kg of frost as the amount of frost formation at the time requires at least about 2 L. Here, it is assumed that the amount of heat stored in the antifreeze liquid is equal to the frost melting latent heat. The amount of heat stored in the antifreeze liquid was estimated to be a temperature difference of 5K as a difference from 0 ° C., which is a temperature at which frost can be dissolved, because the room temperature of the refrigerator compartment or vegetable room is about 5 ° C. on average.

  This means that the storage space in the refrigerator is reduced by that amount (about 2 L), so the convenience is reduced by heating using the antifreeze liquid alone. Moreover, if the heat source required for defrosting cannot be stored in the tank installed in the non-freezing region, it is impossible to defrost all the frost in the cooler. Furthermore, in a refrigerator having a refrigeration temperature zone and a freezing temperature zone, the defrosting time is also important. If the defrosting time is long, the temperature rise in the freezer compartment increases, which may adversely affect the storage stability of the frozen food. Thus, in the defrosting of the refrigerator, not only the required amount of heat but also the heat transfer phenomenon between the circulating antifreeze and the cooler (or frost) becomes important. For example, when the temperature in the tank filled with the antifreeze liquid is reduced during defrosting, the temperature difference from the frost is reduced and the time until the frost is melted is increased.

  In addition, in this patent document 1, when utilizing the cold energy of the frost which grew to the cooler at the time of defrost effectively, there is no indication about reducing to power consumption. Moreover, since only the heating means using the antifreeze liquid is used, if the amount of frost formation is large, the time required for defrosting becomes longer, and there is a risk that the temperature of the freezer compartment rises due to the suspension of the freezing operation during that time. . Therefore, the defrosting operation according to the amount of frost formation cannot be performed.

  Although frost is mainly generated in the cooler, frost may grow on the surface of the air passage (solid wall surface) in which the cooler is housed or in the vicinity of the internal circulation fan. In the defrosting method using the antifreeze liquid, the cooler can be directly heated, so that the heat transfer performance between the heating source (antifreeze liquid) and the frost attached to the cooler is improved. However, the frost in a place away from the cooler cannot be expected to be effective due to direct heating, and must be insufficient.

  In the refrigerator described in Patent Document 2, similarly to the one described in Patent Document 1, waste heat from the radiator and compressor motor of the refrigeration cycle is stored in antifreeze liquid and oil, and this is used during defrosting. . Thereby, the conventional electric heater (defrost heater) is omitted and the power consumption is reduced. However, since the basic configuration of the refrigerator described in this publication is the same as that of the refrigerator described in Patent Document 1, a large tank may be required as described above, or the defrosting time may be increased.

  Moreover, in the refrigerator of patent document 3, the air around an evaporator is heated by natural convection, and frost is dissolved, and heat transfer is not necessarily accelerated | stimulated and there exists a possibility that a long time may be required for defrost.

  The present invention has been made in view of the above-described problems of the prior art, and its purpose is to effectively utilize the heat generated when the refrigerator is operated and exhausted to the outside and the heat possessed by the outside for defrosting. The purpose is to reduce the amount of power required and the defrosting time. Moreover, the objective of this invention is to avoid the malfunction which the antifreeze used for a defrost operation freezes in the middle of piping, and to improve the reliability of a refrigerator. Still another object of the present invention is to reduce the amount of electric power and defrosting time used for defrosting without increasing the size of the tank for storing the antifreeze liquid.

  A refrigerator according to the present invention that achieves the above object includes a refrigerating cycle having a refrigerating room and a freezing room, the refrigerating cycle including the refrigerating room and the compressor for generating cold air that cools the freezing room, and the cooler. A first opening / closing means for opening / closing a flow path for guiding the generated cold air to the refrigerator compartment; a second opening / closing means for opening / closing a flow path for guiding the cold air generated by the cooler to the freezer room; An internal fan that blows the generated cold air to at least one of the refrigerator compartment and the freezer compartment, a first heating means disposed below the cooler and having an electric heater, and the first and second opening / closing operations Means and a fan in the cabinet, and the second heating means for heating the cooling chamber with the air whose temperature has risen through the refrigerating chamber, and the antifreeze liquid is disposed in contact with the cooler and disposed therein. Circulation pump for circulating piping and antifreeze and the pressure A third heating means having a machine room fan for storing at least one of heat generated in the machine and heat of the outside air in the antifreeze, the first and second opening / closing means, the internal fan, and the circulation pump; A control means for controlling the operation of the machine room fan and the first heating means, wherein the control means uses the at least one of the first to third heating means during the defrosting operation. And the refrigerator compartment is cooled by the air flowing through the cooler.

  In this aspect, the control means operates the second and third heating means before the first heating means is operated during the defrosting operation. The control means may operate the first heating means after heating by the second and third heating means, and the second heating means sends the air in the refrigerator temperature zone to the inside of the warehouse. The air after being circulated in the cabinet by a fan is used, and the third heating means preferably stores heat in a plus temperature zone in the antifreeze liquid, and heat transports the antifreeze liquid to the cooler. In addition, a defrost sensor is provided in the vicinity of the antifreeze outlet of the portion where the third heating means contacts the cooler, and the temperature detected by the defrost sensor exceeds the freezing point within a predetermined time from the start of the defrost. When the temperature does not reach, the control means may activate heating by the first heating means in addition to heating of the second and third heating means.

  Further, in the above feature, a defrost sensor is provided in the vicinity of the antifreeze liquid outlet at a portion where the third heating means abuts on the cooler, and the control means detects the freezing temperature of the antifreeze liquid as the temperature detected by the defrost sensor. It is desirable that the circulating pump is not operated until the temperature exceeds, the second heating means defrosts the frosting of the cooler from the outer surface side of the frosting, and the third heating means is attached to the cooler. It is preferable to defrost frost from the surface side that contacts the cooler. Further, the control means preferably operates the first opening / closing means so as to guide the cold air generated by heating the frost attached to the cooler by the second heating means to the refrigerator compartment.

  According to the present invention, when the refrigerator is defrosted, three kinds of heat sources of electric (defrost heater) energy, internal heat energy, and external heat energy are used. The amount of power required for defrosting and the defrosting time can be reduced by effectively using the heat exhausted to the outside and the heat of the external air. Moreover, the reliability of a refrigerator improves by avoiding the malfunction which the antifreeze liquid used for a defrost operation freezes in the middle of piping. Furthermore, the amount of electric power used for defrosting and the defrosting time can be reduced without increasing the size of the tank for storing the antifreeze liquid.

It is a front view of one Example of the refrigerator which concerns on this invention. It is a side surface longitudinal cross-sectional view of the refrigerator shown in FIG. It is the side surface longitudinal cross-sectional view of the refrigerator shown in FIG. 1, and is the figure which changed FIG. 2 and its width direction position. It is a figure of the cooler periphery with which the refrigerator shown in FIG. 1 is provided, and is a back side sectional drawing. It is a graph explaining the calorie | heat amount required for a defrost. It is a graph explaining the electric energy required for a defrost. It is a time chart of one Example of a defrost operation. It is a flowchart of the defrost operation shown in FIG. It is a figure explaining the melting condition of the frost in a cooler. It is a time chart of the other Example of a defrost operation. It is a flowchart of the defrost operation shown in FIG. It is a time chart of the further another Example of a defrost operation. It is a time chart of the further another Example of a defrost operation. It is a flowchart of the defrost operation shown in FIG.

  First, main features of the refrigerator according to the present invention will be described. The refrigerator 1 of the present invention defrosts using three types of heat sources: first, electrical energy (defrost heater), second, internal heat energy, and third, external heat energy. The defrosting by the first electric energy is heating by an electric heater conventionally used (for example, a glass tube heater provided at the lower part of the cooler), and the mode of the defrosting will be described in detail below. It is different from the conventional one. The electric heater heats the air around the cooler and indirectly defrosts through the air. In the defrosting using the second internal heat energy, the air in the refrigerator compartment (including the vegetable compartment) maintained in the plus temperature range above the freezing point is circulated using the internal fan to remove the frost adhering to the cooler. Lend. In other words, the internal heat energy of the refrigerator compartment is energy that effectively uses the heat that enters the outside of the refrigerator through the wall surface of the refrigerator compartment as a heat source during defrosting. In the defrosting by the third external heat energy, the heat outside the storage or the heat of the compressor or radiator provided in the machine room is stored in the heat storage medium in the newly provided tank, and that heat is defrosted. Use.

  As described in Patent Documents 1 and 2, as described above, when defrosting is performed using only the external heat energy, in order to obtain the amount of heat necessary for defrosting, the temperature of the antifreeze liquid to be filled in the tank (temperature during heat storage) Or increase the amount of antifreeze to increase the amount of heat storage, that is, the amount of heating.

  By the way, since the defrosting of the refrigerator is normally performed once a day, if the tank filled with the antifreeze liquid is installed outside the refrigerator, the outside air temperature (for example, 30 ° C.) is not used unless the antifreeze liquid is circulated for one day of the defrosting interval. ) Is possible. However, in order to raise the temperature of the antifreeze liquid above the outside temperature, it is necessary to reuse (heat recovery) the heat radiated from the compressor and the radiator. Note that the defrosting with the third external heat energy alone causes problems of the installation location of the tank filled with the antifreeze liquid and the defrosting time. In order to solve these problems, the present invention has first, second, and third means as defrosting means, and efficiently combines these three kinds of means to reduce the power consumption during defrosting. At the same time, the refrigerating room is cooled by reducing the input energy when using the frost's cold energy during defrosting.

  Also, when performing the defrosting operation after quick freezing that reaches below the freezing temperature of the antifreeze liquid, the cooler temperature of the antifreeze liquid is kept so that the antifreeze liquid that stores the external heat energy does not circulate below the freezing temperature. The antifreeze is circulated after the freezing temperature is exceeded. Therefore, it is possible to suppress an increase in pump power that occurs when the antifreeze liquid is lowered in the freezing temperature, and to reduce power consumption. Furthermore, the increase in the size of the antifreeze liquid tank due to a decrease in specific heat can also be suppressed.

  Below, one Example of the refrigerator which concerns on this invention is described concretely using drawing. FIG. 1 is a front view of the refrigerator 1. The refrigerator 1 includes a refrigerator room 2, an ice making room 3, an upper freezer room 4, a lower freezer room 5, and a vegetable room 6 from above. The refrigerating room 2 includes left and right refrigerating room doors 2a and 2b. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are a drawer type ice making room door 3a and an upper stage, respectively. A freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a are provided. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a are simply referred to as doors 2a to 6a.

  In addition, the refrigerator 1 provides a user with a door sensor (not shown) that detects the open / closed state of each door 2a to 6a and a state in which the door is determined to be open for a predetermined time, for example, 1 minute or longer. An alarm (not shown) for notification and a temperature setter (not shown) for setting the temperature of the refrigerator compartment 2 and the freezer compartment 5 are provided.

  FIG. 2 shows a side sectional view of the refrigerator 1 shown in FIG. 1 (FIG. 2A) and a longitudinal sectional view of the machine room 56 portion. As shown in FIG. 2 (a), the outside of the refrigerator 1 and the inside of the refrigerator are separated by a heat insulating box 10 formed by filling a foam heat insulating material. The heat insulating box 10 of the refrigerator 1 has a plurality of vacuum heat insulating materials 25 mounted thereon. The interior of the refrigerator is partitioned into a refrigerator compartment 2, an upper freezer compartment 4, and an ice making compartment 3 (see FIG. 1) by a heat insulating partition wall 28 disposed above. Further, the lower freezer compartment 5 and the vegetable compartment 6 are partitioned by a heat insulating partition wall 29 arranged below. A plurality of door pockets 32 are provided inside the doors 2 a and 2 b of the refrigerator compartment 2, and the refrigerator compartment 2 is partitioned into a plurality of storage spaces in the vertical direction by a plurality of shelves 36. A freezer compartment front partition 40 is provided between the upper freezer compartment 4 and the lower freezer compartment 5.

  In the ice making room 3, and the upper freezing room 4, the lower freezing room 5, and the vegetable room 6, storage containers 3b to 6b are provided integrally with doors 3a to 6a provided in front of the respective rooms 3 to 6, respectively. The storage containers 3b to 6b can be pulled out by placing a hand on a handle (not shown) of the doors 3a to 6a and pulling it out to the front side. Although the ice making chamber 3 is not shown in FIG. 2, the ice making chamber 3 has the same configuration as described above.

  A cooler storage chamber 8 is formed substantially at the back of the lower freezing chamber 5, and a cooler 7 is provided in the cooler storage chamber 8. An internal fan 9 is provided above the cooler 7. The air blown to the cooler 7 by the internal fan 9 is cooled by exchanging heat with the cooler 7 to be cooled and sent to each part of the refrigerator 1. That is, the refrigerating room 2, the upper freezing room 4, the lower freezing room 5, and the ice making room 3 are passed through the refrigerating room air duct 11, the upper freezer room air duct 12, the lower freezer room air duct 13, and the ice making room air duct (not shown). Cold air is sent to each room.

  A state of cooling by the circulating air in the refrigerator 1 will be described with reference to FIG. FIG. 3 is a side cross-sectional view of the refrigerator 1 at a different cross-sectional position from FIG. The blowing of cool air to each of the chambers 2 to 5 is controlled by opening / closing a refrigerator compartment damper (hereinafter also referred to as “R damper”) 20 and a freezer compartment damper (hereinafter also referred to as “F damper”) 50. Specifically, when the R damper 20 is in the open state and the F damper 50 is in the closed state, the cold air is sent to the refrigerating room 2 through the refrigerating room air duct 11 through the blowout ports 2c provided in multiple stages. The cold air 71 flowing from the back side to the front side of the refrigerator compartment 2 is cooled to the refrigerator compartment 2, and then flows into a refrigerator outlet (not shown) provided in the lower part of the refrigerator compartment 2 and then returned to the cooler 7. It is.

  There are various methods for cooling the vegetable compartment 6. For example, there is a method of directly sending cold air to the vegetable compartment 6 after cooling the refrigerator compartment 2 or a method of sending cold air generated by the cooler 7 to the vegetable compartment 6 alone without going through the refrigerator compartment 2. In the latter case, a dedicated damper for the vegetable compartment 6 is required to control the cool air supplied to the vegetable compartment 6. In the present embodiment, the cold air 73 that has flowed into the vegetable compartment 6 is guided from the vegetable compartment return port 6d provided in front of the lower part of the heat insulating partition wall 29 to the vegetable compartment return discharge port 18a via the vegetable compartment return duct 18 and cooled. It flows into the vessel 7.

  The cool air 72 guided to the freezer compartment 3 is sequentially cooled in the upper freezer compartment 4, the lower freezer compartment 5, and the ice making chamber 3, and then returned to the cooler 7 from the freezer return port 17. A defrost heater 22 is provided at the lower part of the cooler 7. The drain water generated at the time of defrosting is once dropped on the trough 23 and then discharged through the drain hole 27 to the evaporating dish 21 provided at the head of the compressor 24 disposed in the machine chamber 56. The machine room 56 is the lowermost part of the rear surface of the refrigerator 1, is formed outside the heat insulating box 10, and is covered with a machine room cover 91.

  FIG. 2B is a rear view showing the machine room 56 part from which the machine room cover 91 has been removed. The machine room cover 91 is formed with a suction port 96 for taking outside air into the machine room 56 and a discharge port 97 for releasing the air in the machine room 56 to the outside. Although not shown in the drawings, these have an armor plate structure, and prevent anything other than air from circulating.

  The air flowing in from the suction port 92 exchanges heat with the radiator 92 that forms the refrigeration cycle, as shown by an arrow in FIG. 2B, and then is blown to the compressor 24 side by the machine room fan 68. The compressor 24 supported by the compressor support portion 93 generates heat that increases as the rotational speed increases. The outside air sent to the machine room 56 absorbs the heat generated by the compressor 24 and further rises in temperature, and the heat is transferred from the container wall of the heat storage tank 52 to the antifreeze stored in the heat storage tank 52. Thereafter, the product is discharged from the discharge port 97 formed in the machine room cover 91 to the outside of the refrigerator 1. This series of outside air flow is mainly caused by the machine room fan 68.

  FIG. 3 is a diagram for explaining a structure using external heat energy. As described above, the heat storage tank 52 filled with the antifreeze liquid 57 is provided in the machine room 56. Since the heat storage tank 52 collects the heat radiated from the radiator 92 provided in the compressor 24 and / or the machine room 56 in the antifreeze liquid 57, the heat storage tank 52 is likely to increase the amount of heat storage when provided in the machine room 56. . When the heat storage tank 52 is installed in the machine room 56, for example, when the room temperature is 30 ° C., the temperature of the antifreeze liquid 57 in the heat storage tank 52 can be increased to at least 30 ° C. that is the outside temperature. The arrangement of the compressor 24, the heat storage tank 52, and the machine room fan 68 shown in FIG. 2B is merely an example, and the optimum arrangement is determined depending on the capacity of the refrigerator 1 and the like.

  In the normal refrigerator 1, a defrosting operation is performed once a day. In the operation of the refrigerator 1 using the antifreeze liquid 57 in the defrosting mode using the external heat energy, the temperature of the antifreeze liquid 57 can be raised to the room temperature level even after the defrosting is performed. In order to store the amount of heat above room temperature in the antifreeze liquid 57, heat from the compressor 24 installed in the machine room 56 or a radiator (not shown) is positively stored in the antifreeze liquid 57. For example, the heat released from the discharge pipe of the compressor 24 or the compressor 24 can be stored in the antifreeze liquid 57 by exchanging heat with the antifreeze liquid 57 in the heat storage tank 52 to recover the heat. The radiator 92 provided in the machine room 56 is often provided with a fan that promotes heat dissipation. Therefore, the heat storage tank 52 is installed in a place where heat exchange is possible with the heated air that has been blown by the fan and passed through the radiator.

  That is, the heat storage tank 52 and the circulation pump 51 are connected by the pipe 55, the discharge port of the circulation pump 51 and the cooler 7 are connected by the pipe 53, and the cooler 7 and the heat storage tank 52 are connected by the pipe 52, respectively. The antifreeze 57 after heat exchange with the cooler 7 flows in the pipe 54. If the level of the antifreeze liquid 57 filled in the heat storage tank 52 is below the connection position between the pipe 54 and the heat storage tank 52, the circulation pump 51 is rotated in the reverse direction so that the antifreeze liquid circulation pipe 58 (see FIG. 4) The antifreeze liquid 57 can also be recovered. Here, the antifreeze circulating pipe 58 is provided in direct contact with the cooler 7. Due to the reverse rotation of the circulation pump 51, the antifreeze liquid 57 does not remain in the antifreeze circulation pipe 58, and it becomes possible to prevent freezing during the cooling operation and to reduce the heating load when the cooler 7 is heated by the defrost heater 22 alone.

  In FIG. 4, the peripheral part of the cooler 7 arrange | positioned at the back side of the lower stage freezer compartment 5 of the refrigerator 1 is shown with a back side sectional drawing. The defrost sensor 41 is installed in the upper part of the cooler 7, and the control means 66 (refer FIG. 3) performs the control determination regarding a defrost operation based on the temperature which the defrost sensor 41 detected. A defrost heater 22 that has been conventionally used is disposed below the cooler 7. The defrosting heater 22 includes a glass tube 44 having an electric heater inside and a metal radiation fin 45 provided around the glass tube 44. Instead of the metal fin 45, the glass tube 44 may be a double glass tube. Any defrosting heater 22 is employ | adopted with the refrigerator 1 which uses a combustible refrigerant | coolant. Even if the flammable refrigerant leaks in the chamber, the temperature of the outer glass tube surface is lower than the ignition point temperature of the flammable refrigerant, so that the flammable refrigerant can be prevented from firing. A defrosted water dripping preventing portion 43 is provided on the upper portion of the glass tube 44. The defrost water is directly dropped on the glass tube 44 heated to a high temperature to prevent the glass tube from being damaged due to a rapid temperature change.

  In order to heat the cooler 7 by exchanging heat between the cooler 7 and the antifreeze liquid 57, an antifreeze liquid circulation pipe 58 is provided so as to be in direct contact with the cooler 7 separately from the refrigerant pipe of the refrigeration cycle. The antifreeze pipe 58 is caulked between the fins of each stage constituting the cooler 7. The flow direction of the antifreeze liquid 52 in the antifreeze liquid circulation pipe 58 is from the upper side to the lower side or from the lower side to the upper side. In this embodiment, it flows from the lower side to the upper side for the following reason.

  In the present embodiment, after the frost attached to the cooler 7 is completely melted, the cooler 7 is further heated by the defrost heater 22 alone in order to increase the reliability at the time of defrosting. Since the antifreeze inflow portion of the antifreeze circulation pipe 58 is provided in the lower part of the cooler 7, the temperature of the lower part of the cooler 7 can be made higher than the temperature of the upper part. That is, when the defrost heater 22 is turned on and switched to single heating, the cooler 7 starts to rise in temperature from the lower part toward the upper part. When the defrost sensor 41 provided in the upper part of the cooler 7 detects a predetermined temperature, the heating by the defrost heater 22 ends. Therefore, if the temperature of the lower part of the cooler 7 is increased before the defrost heater 22 is switched to the single heating, the single heating time by the defrost heater 22 that greatly affects the power consumption can be shortened.

  Defrosting operation using the cooler 7 and the defrost heater 22 configured as described above will be described below. When the circulation pump 51 is operated, the antifreeze liquid 57 in the heat storage tank 52 flows into the antifreeze liquid circulation pipe 58 provided in the cooler 7 via the pipes 55 and 53. At that time, heat exchange with the frost attached to the cooler 7 is performed to defrost. The temperature of the antifreeze liquid 57 that has exchanged heat with the cooler 7 decreases. The antifreeze liquid 57 that has passed through the cooler 7 is returned to the heat storage tank 52 and circulates again through the same path for a predetermined time.

  The connecting portion on the heat storage tank 52 side of the pipe 54 returning to the heat storage tank 52 is provided at a position above the liquid surface of the antifreeze liquid 57. Therefore, when the circulation pump 51 is rotated in the reverse direction, the circulation pump 51 blows air instead of the antifreeze liquid 57, so that the antifreeze liquid 57 in the antifreeze circulation pipe 58 that is in direct contact with the cooler 7 is blown into the heat storage tank 52. Pushed back. Thereby, the antifreeze liquid 57 can be completely recovered from the antifreeze liquid circulation pipe 58, and the freezing of the antifreeze liquid 57 in the antifreeze liquid circulation pipe 58 is prevented. Furthermore, since the antifreeze liquid 57 is not left in the antifreeze circulation pipe 58, in addition to preventing freezing during the cooling operation, the load can be reduced when the cooler 7 is heated by the defrost heater 22 alone with the circulation pump 51 stopped.

  The state of energy saving in the refrigerator 1 according to the present invention described above will be described with reference to FIGS. FIG. 5 is a graph schematically showing the amount of heat required for defrosting, and FIG. 6 is a diagram showing the amount of power required for defrosting. In the conventional method, the amount of heat Q required for defrosting is obtained only from the defrosting heater (electric heater) provided at the lower part of the cooler 7, and the cooler 7 is heated and defrosted. Therefore, the amount of heat Qe heated by the defrost heater is equal to the amount of heat Q required for defrosting.

  On the other hand, as described above, the refrigerator 1 of the present invention uses a heat source other than the defrost heater 22, that is, the internal heat energy Qin and the external heat energy Qex. Therefore, the heat quantity Q used for defrosting is Q = Qe ′ + Qin + Qex including these heat sources. With these three types of heating sources, heating by the electric heater 22 consumes the largest amount of power.

  In the refrigerator 1 of the present invention, since the heating source is provided in addition to the defrosting heater 22, the heating amount Qe by the electric heater 22 can be set to a heating amount Qe ′ smaller than the heating amount Qe. Even if the required amount of heat Q is the same, the power consumption E can be reduced. Moreover, since it can be set as defrost using the heat energy in a store | warehouse | chamber and the heat energy outside a store | warehouse | chamber, the heat-transfer phenomenon with a heating source and frost is accelerated | stimulated, and heat quantity Q required for defrost is reduced to Q '. You can also. Thereby, the power consumption at the time of defrosting can be reduced further.

  Here, when the cooler 7 is heated by the internal heat energy Qin, the air itself in the refrigerator compartment 2 including the vegetable compartment 6 becomes a heat source. The energy required to obtain the internal heat energy Qin is only the fan power when operating the internal fan 9. When the internal fan 9 is in operation, the air in the refrigerator compartment 2 including the vegetable compartment 6 is blown to the cooler 7 and becomes a heat source for defrosting. At the same time, the frost is melted and heat is exchanged to become cold air, which returns to the refrigerator compartment 2 including the vegetable compartment 6 to become a cooling source. When the cooler 7 is heated by the external heat energy Qex, air outside the storage is basically used as a heat source, so that the necessary electric power is only the pump power when the circulation pump 51 is operated.

  Assuming that the electric energy of the conventional method is Ee (= Qe), as described above, this electric energy value Ee is equal to the electric energy of the electric heater consumed by the defrost heater. On the other hand, in the refrigerator 1 of the present invention, the power amount of the defrost heater 22 corresponds to the heat amount Qe ′, the power amount of the internal fan 9 corresponds to the heat amount Qin, and the power amount of the circulation pump 51 corresponds to the heat amount Qex. Therefore, the consumed electric energy Ee ′ is equal to the sum of the three kinds of electric energy.

  Here, the amount of power consumed by the defrost heater 22 is about 150 W, whereas the amount of power consumed by the internal fan 9 and the circulation pump 51 is about several watts. This greatly contributes to the reduction of power consumption during defrosting. Therefore, in this invention which has the mode heated by heating means other than the defrost heater 22, since the electric energy consumed with the defrost heater 22 is reduced, the electric power consumption of the refrigerator 1 whole in defrost is set to Ee. It becomes possible to reduce to '.

Next, various operation modes of the defrosting operation will be described with reference to FIGS.
[First mode]
7 and 8 are diagrams for explaining the first operation mode of the defrosting operation, FIG. 7 is a time chart of the defrosting operation, and FIG. 8 is a control flowchart of the defrosting operation. In FIG. 7, when the control means 66 controls the refrigerator compartment damper (R damper) 20 and the freezer compartment damper (F damper) 50, the internal fan 9, the circulation pump 51, the machine room fan 68, and the defrost heater 22, the defrost sensor temperature Ts and the refrigerating compartment temperature T _R, are shown with the operating state of each control device. In addition, as shown in FIG. 3, the control means 66 is provided in the corner | angular part of the upper back side of the refrigerator 1, and has CPU66a and the memory | storage means 66b.

  Time t1 is the time when the defrosting operation is started, time t2 is the time when the defrosting heater 22 is switched to individual heating, and time t3 is the time when the defrosting operation ends. Once a day, when the predetermined time or the operation time of the compressor 24 reaches a predetermined time (time t1), the defrosting operation of the refrigerator 1 is started (step S1). At this time, the temperature Ts detected by the defrost sensor 41 is Ts = T1.

  By the way, the operation state of the refrigerator 1 before the time t1 when the defrosting operation is started is generally a cooling operation. At that time, the refrigerator compartment cooling (R damper) 20 is opened and the freezer compartment damper (F damper) 50 is closed, or the refrigerator compartment damper (R damper) 20 is closed and the refrigerator compartment damper (F damper) 50 is closed. Either open the freezer cooling operation or open both the freezer damper (R damper) 20 and the freezer damper (F damper) 50 and both the freezer room 2 (including the vegetable room 6) and the freezer rooms 4, 5 Whether or not to perform the cooling operation is determined by the temperature state in the refrigerator 1 at that time. In any state, the internal fan 9 is ON. The machine room fan 68 is turned on or off according to the temperature detected by the sensor 60 provided in the machine room 56, and is normally on when the outside air temperature is high.

  In the present embodiment, since the temperature of the refrigerator compartment 2 has risen before the time t1 of the start of the defrosting operation, the freezer compartment is cooled. That is, the refrigerator compartment damper (R damper) 20 is closed, the freezer compartment damper (F damper) 50 is opened, the internal fan 9 is turned on, and the machine room fan 68 is turned on.

  The control means 66 opens the R damper 20, closes the F damper 50, turns on the internal fan 9, turns on the circulation pump 51, turns on the machine room fan 68, and turns off the defrost heater 22 (step S2). . That is, the cool air generated in the cooler 7 is guided only to the refrigerator compartment 2 and the vegetable compartment 6 and not to the upper and lower freezer compartments 4 and 5. This is because, as described above, the cooler 7 is heated during the defrosting operation, so that the cooler 7 may not be able to achieve the refrigeration temperature.

  This defrosting operation is a defrosting operation using the internal heat energy by the operation of the internal fan 9 and the external heat energy by the circulation pump operation 51. When the circulation pump 51 is operated, frost is heated through the antifreeze circulation pipe 58. As a result, the temperature of the antifreeze liquid 57 decreases. In order to make up for the amount of heat released from the antifreeze circulating pipe 58 to the frost, the machine room fan 68 is operated to promote the heat storage of the heat energy outside the refrigerator in the antifreeze liquid 57. The heat storage tank 52 is provided with a temperature sensor 60. The temperature of the antifreeze liquid 57 is detected, and the control means 66 controls the machine room fan 68 during defrosting. If the temperature of the antifreeze liquid 57 is lower than the outside air temperature during the defrosting operation, the machine room fan 68 is operated.

  FIG. 9A schematically shows the frost formation and melting state in the cooler 7 during this defrosting operation state. In the defrosting in which the internal fan 9 is operated and the internal heat energy is used from the start time t1 of the defrosting operation to the time t2 when switching to the single heating by the defrosting heater 22, the frost layer grown on the cooler 7 is used. Heat mainly from outside. Circulating air 61 circulating to the refrigerator compartment 2 including the vegetable compartment 6 also passes through the inside of the frost layer, but the frost melts from the outside. On the other hand, in the defrost using the circulation pump 51 and utilizing the external heat energy, the frost is heated from the antifreeze circulating pipe 58 provided in the cooler 7. Thereby, frost is thawed from the inside, and a melting portion 63 is formed. Therefore, melting occurs from the outside and inside of the frost layer adhering to the cooler 7, and heat transfer between the air and the frost is promoted by forced convection passing through the cooler 7, so that the frost can be solved quickly and uniformly. .

Returning to FIG. 7, since the temperature Ts detected by the defrost sensor 41 is the temperature of the cooler 7, when the defrost operation is started, the temperature Ts is reduced from Ts = T1 by the antifreeze liquid 57 etc. in the antifreeze liquid circulation pipe 58. Ts starts to melt and rises to 0 ° C. Here, the period from time t4 to t5 is the time during which the frost is melting, and since the phase changes from frost to water, the defrost sensor temperature Ts is approximately Ts = 0 ° C. = constant. During this time, since the internal fan 9 is operating, the latent heat of melting is taken from the circulating air 61, the circulating air 61 that has passed through the cooler 7 is cooled, and the circulating air 61 is guided to the vegetable compartment 6 and the refrigerator compartment 2 to produce vegetables. The chamber 6 and the refrigerator compartment 2 are cooled. Here, the refrigerating compartment temperature T _R so the internal fan 9 is running decreases. And the stable refrigeration temperature is maintained between the time t4-t5 when the frost is thawed.

  As a result of continuing the defrosting operation using the internal energy and the external energy, if the temperature Ts detected by the defrost sensor 41 is equal to or higher than the freezing point temperature, that is, Ts = T2 (step S3), cooling is performed. In order to melt the frost that may remain in the vicinity of the cooler 7 assuming that the frost attached to the cooler 7 has disappeared, the defrosting operation of the defrost heater 22 is switched (step S4). This temperature T2 is, for example, 1 ° C. immediately after the end of frost melting.

  That is, since the melting of frost is completed, the R damper 20 is closed, the F damper 50 is opened, the internal fan 9 is turned off, the circulation pump 51 is turned off, the machine room fan 68 is turned off, and the defrosting heater 22 is turned on. The control means 66 is switched. When the defrost sensor temperature Ts reaches Ts = T2, the frost of the cooler 7 is dissolved, but frost may remain in the peripheral portion other than the cooler 7, so that the reliability is ensured. The defrosting is performed by the defrosting heater 22 installed at the lower part of the cooler 7.

  In this embodiment, in the case where the heater 22 performs defrosting alone, the freezer damper (F damper) 50 is opened to promote natural convection of the air around the cooler 7 heated by the heater 22. As a result, a circulating flow is generated by natural convection flowing through the cooler 7 ⇒ freezer compartment damper (F damper) 50 ⇒ freezer compartment 4, 5 ⇒ freezer compartment return port 17 ⇒ cooler 7.

  Since the heated air passes through the freezer compartment damper (F damper) 50 and flows into the freezer compartments 4 and 5, the heat load of the freezer compartments 4 and 5 increases. However, the time for the individual defrosting by the heater 22 is only a short time after the frost of the cooler 7 is thawed, and the time for the heated air to flow into the freezer compartments 4 and 5 is also the conventional heater single defrosting time. Is a short time that cannot be compared, and in total, defrosting can be effectively performed by opening the freezer compartment damper (F damper) 50. In addition, although it is easy to generate | occur | produce a circulating flow on the freezer compartments 4 and 5 side as mentioned above, since it is hard to generate a circulating flow on the refrigerator compartment 2 side, the refrigerator compartment damper (R damper) 20 is closed. The internal fan 9 is turned off.

  In the heating by the defrosting heater 22, the heating load increases when the antifreeze liquid 57 remains in the antifreeze circulation pipe 58. Therefore, when the defrost sensor temperature Ts reaches Ts = T2, the circulation pump 51 is reversely rotated. As a result, the antifreeze liquid in the antifreeze liquid circulation pipe 58 can be collected in the heat storage tank 52. At the end of the defrosting, the temperature of the cooler 7 is such that the defrost sensor temperature Ts at the top of the cooler 7 is TS = about 10 ° C., but at the bottom of the cooler 7 close to the defrost heater 22 is close to 40 ° C. There may be. The temperature of the antifreeze liquid 57 after using the external heat energy is reduced because the frost is released. When the defrost sensor temperature Ts is higher than the temperature of the antifreeze liquid 57 measured by the temperature sensor 60 provided in the heat storage tank 52, the circulation pump 51 may be operated to recover the heat of the cooler 7. Thus, when returning from the defrosting operation to the normal cooling operation, the temperature of the cooler 7 can be lowered before the compressor 24 is operated, and the recooling time can be shortened.

  FIG. 9B schematically shows the surroundings of the cooler 7 when the cooler 7 is heated by the defrost heater 22 alone. FIG. 9B is a view of the cooler 7 during defrosting similar to FIG. 9A. In this state, no frost formation is seen in the cooler 7, and the air 62 around the lower part of the cooler 7 heated by the defrost heater 22 flows from the lower side to the upper side. At this time, the temperature starts to rise toward the upper part of the cooler 7, and at the same time, the wall surface of the peripheral part of the cooler 7 is also heated, so that there is no frost remaining.

  When the defrost sensor temperature Ts reaches Ts = T3 (step S5), the single defrost operation at the defrost heater 22 is terminated (step S6).

  When the defrosting operation is completed, the cooling operation is resumed. Therefore, the internal fan is turned on. As in the case before the defrosting operation, the state of the cooling operation differs depending on the temperature inside the refrigerator 1 after the completion of the defrosting operation, but in this embodiment, the refrigerator compartment 4 (including the vegetable compartment 6) and the freezer compartment 4 5 is to be cooled, both the refrigerator compartment damper (R damper) 20 and the freezer compartment damper (F damper) 50 are opened, the internal fan 9 is turned on, and the machine room fan 68 is turned on.

According to the present embodiment, defrosting can be performed using a heating source other than the defrosting heater that uses electrical energy, that is, the internal heat energy and the external heat energy with small power consumption. In other words, when cooling the refrigerator compartment using the melting latent heat of frost, the frost is used from the cooler surface side (outside) using the internal heat energy without using the conventional defrost heater 22 as a heating source. And heating means that uses the outside heat energy from the outside surface side (inside) of the frost is used, so that cooling using the frost melting latent heat can be efficiently performed with less input energy. .
[Second mode]
The second mode of the defrosting operation according to the present invention will be described using FIG. 10 and FIG. FIG. 10 is a time chart of the same defrosting operation as shown in FIG. 7, and FIG. 11 is a flowchart of the defrosting operation control. This mode is a mode suitable when the amount of frost formation is large. The difference from the first mode is that the heating start by the defrost heater 22 is advanced, and the defrosting using the internal heat energy by the operation of the internal fan 9 and the external heat energy by the operation of the circulation pump 51 is completed. Before, the defrost heater 22 is turned ON. When the amount of frost formation is large, that is, when it takes time until time t5 when frost melting ends, the heat source is insufficient with only the internal heat energy and the external heat energy, and the freezing rooms 4 and 5 The temperature may rise above the limit temperature. Therefore, in the second mode, before the time t2 is reached, the defrost heater 22 is operated as a heating source to shorten the defrost time. The temperature and operation state in the refrigerator 1 before and after the defrosting operation are the same as those in the embodiment of FIG.

More specifically, the defrosting operation mode is started once a day or when the operation time of the compressor 24 reaches a predetermined time (step S7). This time is time t1. The R damper 20 is opened, the F damper 50 is closed, the internal fan 9 is turned on, the circulation pump 51 is turned on, the machine room fan 66 is turned on, the defrosting heater 22 is turned off (step S8), and the defrosting operation is started. To do. If the temperature T _R of the freezer compartment 2 becomes equal to or higher than T _R = TF2 before the time t5 when the frost is completely thawed (step S9), the preservability of the food stored in the freezer compartments 4 and 5 is increased. Since there is a concern about deterioration, the defrost heater is turned on although the frost is being melted (step S10). Here, time t5 is a time when frost melting is completed, and time t6 is a time when the freezer compartment temperature T _R becomes T _R = TF2.

  When the defrost sensor temperature Ts reaches Ts = T2, the R damper 20 is closed, the F damper 50 is opened, the internal fan 9 is turned off, the circulation pump 51 is turned off, the machine room fan 66 is turned off, and the defrost heater is turned on. 22 continues the ON state (step S12). The cooler 7 is heated using the defrost heater 22 alone until the defrost sensor temperature Ts reaches Ts = T3, which is a temperature equal to or higher than the freezing point.

In this defrosting operation mode, in order to cool the refrigerator compartment 2 using the frost melting latent heat, the input energy is reduced as much as possible, and the defrosting operation using the internal heat energy and the external heat energy as heat sources (t4 to t4). By performing t5), cooling of the refrigerator compartment 2 using the frost melting latent heat is realized. When the amount of frost formation is large, the defrosting heater 22 is added to the heating source before the frost is completely melted, so that the time (˜t5) during which the frost is completely melted can be shortened.
[Third mode]
Another mode of the defrosting operation according to the present invention will be described with reference to FIG. FIG. 12 is a time chart of the defrosting operation similar to FIGS. This is a defrosting operation mode suitable when the amount of frost formation is small. When the amount of frost formation is small, the time interval t4 to t5 at which frost is released is short. Further, the temperature Ts detected by the defrost sensor 41 is rapidly increased. Therefore, the temperature gradient from the start of defrosting to the start of frost melting is measured in advance when there is little frost. If this value is used as a reference value and the temperature gradient is smaller than this, it is determined that there is little frost. The temperature and operation state in the refrigerator 1 before and after the defrosting operation are the same as those in the embodiment of FIG.

  When it is determined that the amount of frost formation is small, the internal fan 9 is operated from time t1 to time t4 to perform defrosting with internal thermal energy. When it is determined that the temperature gradient is greater than the reference value and the amount of frost formation is not small, the first defrosting operation mode shown in FIG. 7 is entered. Specifically, until time t7 when the amount of frost formation is determined, as in the first defrosting operation mode, the R damper 20 is opened, the F damper 50 is closed, the internal fan 9 is turned on, the circulation pump 51 is turned on, The machine room fan 68 is turned on and the defrosting heater is turned off to start the defrosting operation. Here, the defrosting operation start time t1 is determined from a predetermined time once a day, an operating time of the compressor, or the like.

If the defrost sensor temperature Ts is equal to or lower than a predetermined reference value T7 at the defrosting amount determination time t7 when the defrost sensor temperature Ts is still below the freezing point, that is, until the defrost sensor temperature Ts reaches the freezing point temperature, that is, Until the frost begins to melt, the circulation pump 51 is turned off and the machine room fan 66 is turned off, and the cooler 7 is heated only by the circulation of the cool air by the internal fan. At time t4 when the defrost sensor temperature Ts reaches the freezing point temperature, the circulation pump 51 is turned on again and the machine room fan 66 is turned on again in order to compensate for the shortage of heating. The subsequent steps are the same as those in the first defrosting operation mode shown in FIG.
[Fourth mode]
The 4th defrosting operation mode which concerns on this invention is demonstrated using FIG. 13 and FIG. FIG. 13 is a time chart of the defrosting operation, and FIG. 14 is a control flowchart of the defrosting operation. The defrosting operation mode is a mode for starting the defrosting operation when the defrosting sensor temperature Ts reaches the lower limit temperature T0. The freezing temperature of the antifreeze liquid 57 is determined by adjusting the concentration of the antifreeze liquid 57 filled in the heat storage tank 52. The temperature and operation state in the refrigerator 1 before and after the defrosting operation are the same as those in the embodiment of FIG.

  By the way, in order to lower the freezing temperature of the antifreeze liquid 57, it is necessary to increase the concentration of the antifreeze liquid 57, but when the concentration is increased, the viscosity of the antifreeze liquid becomes too high and the power of the circulation pump 51 increases. As a result, the amount of power consumed when the heat stored by the external heat energy is transported to the antifreeze circulating pipe 58 is increased. Furthermore, specific heat becomes small, the capacity | capacitance of the thermal storage tank 52 increases, and installation property deteriorates.

  In the refrigerator 1, the quick freezing operation is performed when rapidly freezing. In this quick freezing operation, the temperature of the cooler 7 is lower than that in the normal cooling operation. The antifreeze liquid 57 is prevented from freezing. In order to eliminate the problem in the conventional defrosting operation due to the change in the concentration of the antifreeze liquid 57, in the fourth defrosting operation mode, it is possible to prevent freezing in the pipe without increasing the concentration of the antifreeze liquid. Yes.

  Defrosting is started at a predetermined temperature T0 that is equal to or lower than the freezing temperature of the antifreeze liquid 57 filled in the heat storage tank 52 (step S15). If the circulation pump 51 is operated at this temperature, the antifreeze liquid may freeze in the pipe. Therefore, the control means 66 opens the R damper 20, closes the F damper 50, turns on the internal fan 9, turns off the circulation pump 51, turns off the machine room fan 68, and turns off the defrosting heater 22 (step S16). . That is, it differs from the first defrosting operation mode shown in FIG. 7 only in that the circulation pump 51 is turned off. The defrosting operation is continued for a while only by storing the internal energy by the internal fan 9 and the external energy by the mechanical room fan 68. When the defrost sensor temperature Ts rises to a temperature T1 that exceeds the freezing temperature of the antifreeze liquid 52 (step S17), the circulation pump 51 is turned on to heat the cooler 7 with the antifreeze liquid 52 (step S18). After that, it is the same as the 1st defrosting operation mode shown in FIG. 7 (step S20-step S24). Instead of step 16, the internal fan 9 and the circulation pump 51 may be stopped for a while after the start of the defrosting operation to wait for the defrosting sensor temperature Ts to rise.

  Further, as in the second defrosting operation mode shown in FIGS. 10 and 11, the freezing room temperature rises above TF2 before frosting is excessive and frost melting ends (time t5). In such a case, the heating start of the defrost heater 22 is turned on early. That is, when the refrigeration operation is stopped for a long time (step S19), the defrosting heater is turned on to accelerate frost melting (step S20). When the defrost sensor temperature Ts reaches T2 (step S21), the defrost sensor 22 is switched to single heating (step S22). The defrosting sensor temperature Ts is raised to T3 by single heating of the defrosting heater 22 (step S23), and then the defrosting operation is terminated (step S24).

  According to each embodiment and the defrosting operation mode of the present invention described above, the frost cooling energy that has grown in the cooler during defrosting is effectively utilized, so that the frost can be melted while defrosting with less input energy. Cooling using latent heat can also be performed, and power consumption can be reduced. In addition, since only a heating means using an antifreeze liquid is conventionally provided, it is difficult to suppress an increase in the temperature of the freezer compartment when the amount of frost formation is large. According to each of the above embodiments, defrosting according to the amount of frost formation is possible. Therefore, when the amount of frost formation is small, the defrosting time can be shortened, and when the amount of frost formation is large, the temperature of the freezer compartment increases. Can be prevented, and troubles such as freezing of the antifreeze can be prevented.

  In refrigerators, frost is mainly generated in the cooler, but frost may grow on the surface of the air passage (solid wall surface) in which the cooler is housed or in the vicinity of the internal circulation fan. is there. In conventional defrosting using antifreeze, the cooler is directly heated, so heat transfer between the antifreeze that is the heating source and the frost attached to the cooler is promoted, but frost in a location away from the cooler is surely secured. It was difficult to solve. In this embodiment, since the defrost heater is mainly used for defrosting at a place away from the cooler, the amount of electric power is small, and frost formation in each part of the refrigerator can be reliably defrosted.

  Moreover, in the refrigerator shown in the above embodiment, energy is saved because the heating source other than the defrosting heater (electric energy), that is, the defrosting is performed using the internal heat energy and the external heat energy with low power consumption as the heating sources. It becomes.

  DESCRIPTION OF SYMBOLS 1 ... Refrigerator, 2 ... Cold room, 2a, 2b ... Door, 2c ... Outlet, 3 ... Ice making room, 3a ... Door, 3b ... Storage container, 4 ... Upper stage freezer room, 4a ... Door, 4b ... Storage container, 5 ... lower freezing room, 5a ... door, 5b ... storage container, 6 ... vegetable room, 6a ... door, 6b ... storage container, 6d ... vegetable room return port, 7 ... cooler, 8 ... cooler storage room, 9 ... storage Inner fan, 10 ... heat insulation box, 11 ... refrigerator compartment air duct, 12 ... upper freezer compartment air duct, 13 ... lower freezer compartment air duct, 17 ... freezer compartment return port, 18 ... vegetable compartment return duct, 18a ... vegetable compartment Return discharge port, 20 ... refrigerator (R damper, first opening / closing means), 21 ... evaporating dish, 22 ... defrosting heater (first heating means), 23 ... soot, 24 ... compressor, 25 ... vacuum Insulating material, 27 ... Drain hole, 28, 29 ... Insulating partition wall, 32 ... Door pocket, 36 ... Shelf, 40 ... Front compartment of freezer compartment DESCRIPTION OF SYMBOLS 41 ... Defrost sensor, 43 ... Defrost water dripping prevention part, 44 ... Glass tube, 45 ... Metal fin (radiation fin), 46 ... Cold room cold air return air path, 50 ... Freezer compartment damper (F damper, 2nd Opening and closing means), 51 ... circulation pump, 52 ... heat storage tank, 53-55 ... pipe, 56 ... machine room, 57 ... antifreeze liquid, 58 ... antifreeze liquid circulation pipe, 59 ... frost, 60 ... sensor, 61 ... circulating air, 62 ... Heated air, 63 ... melting portion, 66 ... control means, 66a ... CPU, 66b ... storage means, 68 ... machine room fan, 71-73 ... cold air (flow), 91 ... machine room cover, 92 ... radiator, 93 Compressor support, 94 ... machine room base, 96 ... suction port, 97 ... discharge port.

Claims (7)

A refrigeration cycle having a refrigerator compartment and a freezer compartment, including a refrigerator and a compressor for generating cold air for cooling the refrigerator compartment and the freezer compartment, and a flow path for guiding the cold air generated by the cooler to the refrigerator compartment A first opening / closing means for opening / closing the air, a second opening / closing means for opening / closing a flow path for guiding the cool air generated by the cooler to the freezer compartment, and the cooler chamber and the freezer compartment for the cool air generated by the cooler. An internal fan that blows air to at least one of the above, a first heating means that is disposed below the cooler and has an electric heater, the first and second opening / closing means, and the internal fan, A second heating means for heating the cooler with the air whose temperature has risen through the refrigerating chamber; a pipe which is disposed in contact with the cooler and through which the antifreeze liquid flows; a circulation pump for circulating the antifreeze liquid; and the compression Less heat generated in the machine and heat from the outside Wherein the third heating means having a heat storage tank and the machine compartment fan to the heat storage either in antifreeze also the first, and second switching means the in-compartment fan and the circulating pump and the machine compartment fan first Control means for controlling the operation of one heating means, and during the defrosting operation, the control means heats the cooler using at least one of the first to third heating means, and this cooler The refrigeration chamber is cooled with the air flowing through the section, and a defrost sensor is provided in the vicinity of the antifreeze outlet of the portion where the third heating means contacts the cooler, and the control means is detected by the defrost sensor. wherein the temperature was having a operation for recovering the heat storage tank the antifreeze in the pipe without operating the circulation pump to above freezing temperature, by reversely rotating the circulation pump of the antifreeze Built warehouse.   2. The refrigerator according to claim 1, wherein the control unit operates the second and third heating units before the first heating unit is operated during the defrosting operation.   The refrigerator according to claim 1 or 2, wherein the control means activates the first heating means after heating by the second and third heating means.   The second heating means uses air after the inside air in a refrigerator temperature zone is circulated in the warehouse by the inside fan, and the third heating means is a heat in a plus temperature zone for the antifreeze liquid. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator is configured to store heat and transport the antifreeze liquid to the cooler. When the temperature detected by the defrost sensor does not reach a predetermined temperature exceeding the freezing point within a predetermined time from the start of defrosting, the control means adds the second and third heating means in addition to the heating of the second and third heating means. The refrigerator according to any one of claims 1 to 4, wherein heating by one heating means is activated. The second heating means defrosts the frost on the cooler from the outer surface side of the frost, and the third heating means removes the frost on the cooler from the surface side in contact with the cooler. The refrigerator according to any one of claims 1 to 5, wherein the refrigerator is frosted . 2. The control means operates the first opening / closing means so as to guide the cold air generated by heating the frost attached to the cooler by the second heating means to the refrigerator compartment. The refrigerator of any one of thru | or 6 .

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