KR20130020571A - Refrigerator - Google Patents

Abstract

PURPOSE: A refrigerator is provided to reduce a defrost time and an electric energy which is used for defrost by using heat of the external air and exhausted heat to the outside when the refrigerator runs. CONSTITUTION: A refrigerator comprises a refrigerating cycle, a first switching method(20), a second switching method(50), an inside of the refrigerator fan(9), and a first heating method, a second heating method, a third heating method and a controller. The refrigerating cycle has a refrigerating chamber and a freezing compartment, a cooler and compressor which are generated the cool air. The first switching method opens a path which cool air induces the refrigerating chamber is passing through. The second switching method opens a path which cool air is generated at the cooler induces the freezing compartment. The second switching method opens a path which cool air is generated at the cooler induces the freezing compartment. The first heating method is mounted at the downward of the cooler and has an electric heater. The second heating method heats up a room of the cooler by the heated air.

Description

Refrigerator {REFRIGERATOR}

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

An example of a conventional refrigerator is disclosed in Patent Document 1. In the refrigerator described in this publication, a heat absorber piped to a cooler is provided in a non-refrigerated area (for example, a refrigerating chamber, a vegetable chamber, or a machine room). At the time of defrosting, the antifreeze filled in the heat absorber is circulated by a circulation pump and used as a heating source of the cooler. This reduces the amount of power consumed during defrosting. Moreover, the electric heater (defrost heater) generally used is abbreviate | omitted by using the heat source stored in the heat absorber. Thereby, it is described that defrosting which reduced the amount of power consumption compared with the past can be performed, without temporarily raising the temperature in a refrigerator temporarily remarkably.

The other example of the conventional refrigerator is described in patent document 2. As shown in FIG. In the refrigerator described in this publication, heat dissipation of a radiator or compressor motor in a refrigeration cycle is accumulated in antifreeze or oil, and the amount of power consumption is reduced compared to the case of using a conventional electric heater (defrost heater) by using this heat storage during defrosting. have. The heat storage to antifreeze and oil is transmitted to a cooler through a heat pipe and a circulation pump, and is used for defrost.

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

Japanese Patent Application Publication No. 2009-92371 Japanese Patent Application Laid-open No. 59-81479 Japanese Patent Application Laid-open No. Hei 11-23135

In the refrigerator of the said patent document 1, in order to heat a frost with a little energy (heating a chiller), a tank is installed in the non-freezing area | region, and the energy required at the time of defrosting is stored in the antifreeze filled in the tank. This eliminates the need for an electric heater conventionally used for defrosting, and enables a significant reduction in power consumption. Here, a non-freezing area | region is a refrigerator compartment, a vegetable compartment, and a machine compartment (compressor installation part), for example. In the refrigerator described in this publication, since an antifreeze of 0 ° C. or higher is required to melt frost, an endotherm filled with an antifreeze needs to be installed at a temperature range of at least a freezing point.

However, the temperature of the refrigerating compartment and the vegetable compartment is about 5 ° C. on average, and it is difficult to secure the amount of heat stored in the antifreeze, and it is difficult to sufficiently obtain the heat amount necessary for melting frost. For example, when general brine (main component: ethylene glycol) is used as an antifreeze, the concentration is 70 Wt% (freezing temperature about -40 ° C), specific heat 2.891 kJ / (kgK), density is about 1110 kg / m 3, and is usually cooled. If the amount of antifreeze required to dissolve 0.1 kg of frost as the amount of frosting at the time is estimated, at least about 2 L is required. Here, it is assumed that the amount of heat accumulated in the antifreeze is equal to the latent heat of fusion of frost. The amount of heat accumulated in the antifreeze was approximated by a temperature difference of 5K as a difference from 0 ° C, which is a temperature at which the frost melts, because the room temperature of the refrigerating chamber and the vegetable room is about 5 ° C on average.

This means that the inside storage space of the refrigerator is reduced by that much (about 2L), so that the convenience is lowered by heating by the antifreeze alone. In addition, if the heat source required for the defrost cannot be accumulated in the tank provided in the non-freezing area, the frost of the cooler cannot be melted entirely. In addition, in a refrigerator having a refrigerating temperature zone and a freezing temperature zone, defrosting time is also important. If the defrosting time is long, the temperature rise of the freezer compartment increases, which may adversely affect the shelf life of frozen food. Thus, in the defrost of the refrigerator, not only the amount of heat required but also the heat transfer phenomenon of the circulating antifreeze and the cooler (or frost) becomes important. For example, when the temperature in the tank filled with antifreeze during defrosting decreases, the temperature difference with frost becomes small, and the time until frost melts becomes long.

Moreover, in this patent document 1, when using the cold heat energy of the frost which grew in the cooler at the time of defrosting effectively, there is no indication about reducing to power consumption. Moreover, since only the heating means using an antifreeze liquid is used, the time required for defrosting becomes long when there is much amount of frosting, and there exists a possibility that the problem that the temperature of a freezer compartment raises by stopping of freezing operation in the meantime may arise. Therefore, defrosting operation according to the amount of implantation cannot be performed.

The frost mainly occurs in the cooler, but the frost may also grow in the vicinity of the air passage surface (solid wall surface) in which the cooler is stored or in the vicinity of the circulation fan inside the cooler. In the defrosting system using an antifreeze, since the cooler can be directly heated, the heat transfer performance between the heating source (antifreeze) and the frost attached to the cooler is improved. However, the effect of direct heating cannot be expected with respect to the frost of the place away from the cooler, and therefore, it becomes insufficient.

Also in the refrigerator of patent document 2, similarly to patent document 1, the heat storage from the radiator and the compressor motor of a refrigeration cycle is accumulate | stored by antifreeze and oil, and this is used at the time of defrosting. As a result, a conventional electric heater (defrost heater) is omitted and power consumption is reduced. However, since the refrigerator described in this publication also has the same basic configuration as the refrigerator described in Patent Document 1, a large tank may be required as described above, or the defrosting time may be long.

In addition, in the refrigerator described in Patent Document 3, by heating the air around the evaporator by natural convection to dissolve frost, heat transfer is not necessarily promoted, which may require a long time for defrosting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to effectively utilize the heat generated by the operation of the refrigerator and exhausted to the outside and the heat of the outside, thereby eliminating the amount of power and defrost time required for defrosting. To reduce it. Moreover, the objective of this invention is to avoid the problem that the antifreeze used for defrosting operation freezes in the middle of piping, and to improve the reliability of a refrigerator. Another object of the present invention is to reduce the amount of power used for defrosting and defrosting time without increasing the size of the tank containing the antifreeze.

The refrigerator of the present invention, which achieves the above object, has a refrigerating compartment and a freezing compartment, and includes a refrigerating cycle including a cooler and a compressor for generating cold air for cooling the refrigerating compartment and the freezing compartment, and guides the cold air generated in the cooler to the refrigerating compartment. First opening and closing means for opening and closing a flow path, second opening and closing means for opening and closing a flow path for inducing cold air generated in the cooler to the freezer compartment, and an internal fan for blowing cool air generated in the cooler to at least one of the refrigerating compartment and the freezing compartment. And a first heating means disposed below the cooler, the first heating means having an electric heater, the first and second opening and closing means, and the in-vehicle fan, and heating the cooling chamber by air having flowed through the refrigerating compartment and rising in temperature. The second heating means, the pipe which is disposed in contact with the cooler, and the antifreeze flows through Third heating means having a circulating pump for returning heat and a machine room fan for accumulating at least one of heat generated from the compressor and heat of outside air to the antifreeze, the first and second opening and closing means, the internal fan and the circulation pump. And control means for controlling the operation of the machine room fan and the first heating means, wherein during control operation, the control means heats the cooler using at least one of the first to third heating means. The refrigerator compartment is cooled by the air which passed this cooler part.

In this aspect, the control means is characterized in that the second and third heating means are operated before the first heating means is operated during the defrosting operation. The control means may be configured to operate the first heating means after heating by the second and third heating means, and the second heating means circulates the air in the refrigerator at the refrigerating temperature range in the air in the refrigerator. It is good to use the following air, and the said 3rd heating means heat-stores the heat | fever of positive temperature band to antifreeze, and heat-transfers the said antifreeze to the said cooler. Further, a defrost sensor is provided near the antifreeze outlet of the portion where the third heating means contacts the cooler, and the temperature detected by the defrost sensor does not reach a predetermined temperature exceeding a freezing point within a predetermined time from the start of defrosting. In that case, the said control means may operate heating by the said 1st heating means in addition to the heating of the said 2nd and 3rd heating means.

Moreover, in the said characteristic, the defrost sensor is installed in the vicinity of the antifreeze outlet of the part which the said 3rd heating means contacts with the said cooler, The said control means is that the temperature which the said defrost sensor detected exceeds the freezing temperature of antifreeze. Preferably, the circulation pump is not operated until the second heating means defrosts the idea of the cooler from the outer surface side of the idea, and the third heating means contacts the idea of the cooler with the cooler. It is preferable to defrost from the surface side. The control means preferably operates the first opening / closing means to guide the cold air generated by heating the frost attached to the cooler by the second heating means to the refrigerating compartment.

According to the present invention, since three types of heat sources of electric (defrost heater) energy, high internal heat energy, and high external heat energy are used during defrosting of the refrigerator, heat generated from the operation of the refrigerator and exhausted to the outside is provided. By effectively utilizing the heat that is contained, the amount of power and the defrosting time required for defrosting can be reduced. In addition, the reliability of the refrigerator is improved by avoiding the problem of the antifreeze used in the defrosting operation being frozen in the middle of the pipe. In addition, the amount of power used for defrosting and the defrosting time can be reduced without increasing the size of the tank containing the antifreeze.

1 is a front view of one embodiment of a refrigerator according to the present invention;
Figure 2 is a side longitudinal cross-sectional view of the refrigerator shown in FIG.
3 is a side longitudinal cross-sectional view of the refrigerator illustrated in FIG. 1, in which FIG. 2 and its widthwise position are changed;
4 is a view around the cooler of the refrigerator illustrated in FIG. 1, and a rear side cross-sectional view thereof.
5 is a graph for explaining calories required for defrost.
6 is a graph illustrating the amount of power required for defrost.
7 is a time chart of one embodiment of defrosting operation.
8 is a flowchart of a defrosting operation shown in FIG. 7.
9 is a diagram illustrating a melting state of frost in a cooler.
10 is a time chart of another embodiment of defrosting operation.
11 is a flowchart of a defrosting operation shown in FIG. 10.
12 is a time chart of yet another embodiment of defrosting operation.
13 is a time chart of yet another embodiment of defrosting operation.
14 is a flowchart of the defrosting operation shown in FIG. 13.

First, the main features of the refrigerator according to the present invention will be described. The refrigerator 1 of the present invention is first defrosted using three types of heat sources: electrical energy (defrost heater), secondly high internal heat energy, and thirdly high external heat energy. The defrost by the first electric energy is heating by an electric heater (for example, a glass tube heater installed in the lower part of the cooler) that is conventionally used, but the form of the defrost is described in detail below. It is different from the conventional one. The electric heater heats the air around the cooler and indirectly dissolves frost through the air. In the second defrost by the high heat resistance energy, a fan in the air is used to circulate air in the refrigerating compartment (including the vegetable compartment) maintained at a positive temperature above the freezing point to melt the frost attached to the cooler. The high heat energy inside the refrigerating chamber is, in other words, the energy that effectively utilizes heat invading from the outside of the refrigerating chamber as a heat source during defrosting. In the third defrosting by the high external heat energy, the external heat or the heat of the compressor or the radiator installed in the machine room is accumulated in the heat storage medium in the newly installed tank, and the heat is used at the time of defrosting.

As described in Patent Literatures 1 and 2 described above, when defrosting with high external heat energy alone, in order to obtain the amount of heat required for defrosting, the antifreeze temperature (temperature during heat storage) to be filled in the tank is increased or By increasing the amount, there is no choice but to increase the amount of heat storage, that is, the amount of heating.

By the way, since the defrost of a refrigerator is normally once a day, if a tank filled with antifreeze is installed outside, it will be equal to the outside air temperature (for example, 30 degreeC), unless the antifreeze is circulated for 1 day which is a defrost interval. It is possible to. However, in order to raise the temperature of antifreeze beyond the temperature outside, it is necessary to reuse (heat recovery) the heat radiated | emitted from a compressor or a radiator. In addition, the third defrost by the extra-high thermal energy alone causes problems in the installation place and defrost time of the tank filled with the antifreeze. In this invention, in order to solve these problems, it has the 1st, 2nd, 3rd means as a defrosting means, these three types of means are combined effectively, and the reduction of the power consumption at the time of defrosting, The refrigerating chamber is cooled by reducing the input energy when using the cold heat energy.

In addition, when defrosting operation is performed after rapid freezing reaching the freezing temperature of the antifreeze, the antifreeze is circulated after the temperature of the cooler becomes higher than the freezing temperature of the antifreeze so that the antifreeze that has accumulated high external heat energy does not circulate below the freezing temperature. I'm making it. Therefore, an increase in pump power caused by the antifreeze due to the freezing temperature decrease can be suppressed, and the amount of power consumption can be reduced. Moreover, the enlargement of an antifreeze tank by the fall of specific heat can also be suppressed.

EMBODIMENT OF THE INVENTION Below, one Example of the refrigerator which concerns on this invention is described concretely using drawing. 1 is a front view of the refrigerator 1. The refrigerator 1 is provided with the refrigerator compartment 2, the ice-making chamber 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 from upper direction. The refrigerating chamber 2 is provided with the refrigerating chamber doors 2a and 2b of the shape divided to the left and right, and the ice-making chamber 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are each withdrawable type | mold. Ice-making door 3a, upper freezer door 4a, lower freezer door 5a, and vegetable compartment door 6a. Hereinafter, the refrigerating chamber doors 2a and 2b, the ice making chamber door 3a, the upper freezing chamber door 4a, the lower freezing chamber door 5a, and the vegetable chamber door 6a are simply referred to as doors 2a to 6a.

In the refrigerator 1, a door sensor (not shown) that detects the open / close state of each of the doors 2a to 6a, and a state determined as the door open state are continued for a predetermined time, for example, for 1 minute or longer. An alarm (not shown) notifying a user, and a temperature setter (not shown) for setting the temperature of the refrigerating chamber 2 or the freezing chamber 5 are provided.

2 is a sectional side view (FIG. 2 (a)) of the refrigerator 1 shown in FIG. 1, and a longitudinal cross-sectional view of the machine room 56 part. As shown to Fig.2 (a), the outside and inside of the refrigerator 1 are partitioned by the heat insulation box 10 formed by filling a foam heat insulating material. The heat insulation box 10 of the refrigerator 1 mounts the some vacuum heat insulating material 25. As shown in FIG. The interior is partitioned into the refrigerating chamber 2, the upper end freezing chamber 4, and the ice making chamber 3 (refer FIG. 1) by the heat insulation partition wall 28 arrange | positioned upwards. Moreover, it is partitioned into the lower end freezer compartment 5 and the vegetable compartment 6 by the heat insulation partition wall 29 arrange | positioned below. A plurality of door pockets 32 are provided on the inner side of the doors 2a and 2b of the refrigerating chamber 2, and the refrigerating chamber 2 is divided into a plurality of storage spaces in the longitudinal direction by the plurality of shelves 36. have. The freezer compartment front surface partition part 40 is provided between the upper freezer compartment 4 and the lower freezer compartment 5.

In the ice making chamber 3, the upper freezing chamber 4, the lower freezing chamber 5, and the vegetable chamber 6, the storage containers 3b to 1 are integrally formed with the doors 3a to 6a provided in front of the chambers 3 to 6. 6b) is provided, respectively, and it is possible to take out the storage containers 3b-6b by drawing a hand to the front part by hand to the handle part (not shown) of the doors 3a-6a. In addition, although the ice making room 3 is not shown in FIG. 2, as mentioned above, the ice making room 3 also has the same structure.

The cooler storage chamber 8 is formed in the substantially back part of the lower freezer compartment 5, and the cooler 7 is provided in this cooler storage chamber 8. As shown in FIG. Above the cooler 7, a fan 9 is provided. The air blown into the cooler 7 by the internal fan 9 is cooled by heat exchange with the cooler 7 to be cold, and is sent to each part of the refrigerator 1. That is, the refrigerating chamber 2 and the upper freezing chamber 4 and the lower freezing chamber 5 through the refrigerating chamber blowing duct 11 and the upper freezing chamber blowing duct 12, the lower freezing chamber blowing duct 13, and the ice making chamber blowing duct not shown. ), Cold air is sent to each chamber of the ice-making chamber (3).

The state of cooling by the circulating air in the refrigerator 1 is demonstrated using FIG. 3 together. 3 is a side sectional view of the refrigerator 1 in a cross-sectional position different from that of FIG. Blowing of cold air to each of the chambers 2 to 5 is controlled by opening and closing of the refrigerator compartment damper (hereinafter referred to as R damper) 20 and the 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 chamber 2 from the blower outlet 2c provided in multiple stages via the refrigerating chamber blowing duct 11. . The cold air 71 which flowed from the back side to the front side of the refrigerating compartment 2 flows into the refrigerating chamber return port which is not shown in the lower part of the refrigerating compartment 2 after cooling the refrigerating compartment 2, and then cools ( Return to 7).

There are various methods for cooling the vegetable compartment 6. For example, after cooling the refrigerating compartment (2), direct cooling air to the vegetable compartment (6), or a method of sending the cold air generated in the cooler (7) to the vegetable compartment (6) alone without passing through the refrigerating compartment (2) have. In the latter case, in order to control the cold air supplied to the vegetable chamber 6, the damper exclusively for the vegetable chamber 6 is needed. In this embodiment, through the vegetable chamber return duct 18 from the vegetable chamber return opening 6d which installed the cold air 73 which flowed into the vegetable chamber 6 in the lower front of the heat insulation partition wall 29, the vegetable chamber return discharge opening ( It leads to 18a) and flows into the cooler 7.

The cold air 72 guided to the freezer compartment 3 is sequentially cooled to 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 compartment return port 17. . The defrost heater 22 is provided in the lower part of the cooler 7. The drain water generated at the time of defrosting is once dropped to the cylinder 23 and then discharged through the drain hole 27 to the evaporation dish 21 provided in the head of the compressor 24 disposed in the machine room 56. The machine room 56 is the lowermost part of the back surface of the refrigerator 1, is formed in the outer side of the heat insulation box 10, and is covered with the machine room cover 91. As shown in FIG.

In FIG.2 (b), the part of the machine room 56 from which the machine room cover 91 was removed is shown in a rear view. The machine room cover 91 is formed with a suction port 96 for introducing outside air into the machine room 56 and a discharge port 97 for discharging air in the machine room 56 to the outside. Although not shown in the drawing, they have a louver structure, preventing the flow of anything other than air.

As shown by an arrow in FIG. 2B, the air introduced from the inlet port 92 exchanges heat with the radiator 92 forming the refrigeration cycle, and then blows air toward the compressor 24 by the machine room fan 68. do. The compressor 24 supported by the compressor support part 93 generates heat which increases with the increase of the rotation speed. The outside air sent to the machine room 56 absorbs the heat which this compressor 24 generate | occur | produces, and raises temperature further, and heats the heat from the container wall of the heat storage tank 52 to the antifreeze stored in the heat storage tank 52. Thereafter, it is discharged out of the refrigerator 1 from the discharge port 97 formed in the machine room cover 91. This series of outside air flow is mainly caused by the machine room fan 68.

3 is a view for explaining a structure using high external heat energy. As described above, the heat storage tank 52 filled with the antifreeze 57 is provided in the machine room 56. The heat storage tank 52 recovers the heat dissipated from the radiator 92 provided in the compressor 24 and / or the machine room 56 to the antifreeze 57, so that the heat storage amount is set in the machine room 56. Easy to increase. When the heat storage tank 52 is provided in the machine room 56, for example, in the case of room temperature 30 ° C, the temperature of the antifreeze 57 in the heat storage tank 52 can be raised to 30 ° C, which is at least the outside temperature. In addition, arrangement | positioning of the compressor 24, the heat storage tank 52, and the machine room fan 68 shown in FIG.2 (b) is only an example, The optimal arrangement | positioning is determined according to the capacity | capacitance of the refrigerator 1, etc. As shown in FIG.

In the normal refrigerator 1, defrosting operation | movement is performed once a day. In the operation of the refrigerator 1 using the antifreeze 57 which is the defrost mode using the extra-thermal heat energy, it is possible to raise the temperature of the antifreeze 57 to a room temperature level even after defrosting. In order to accumulate heat of room temperature or more in the antifreeze 57, the antifreeze 57 actively accumulates heat from the compressor 24 provided in the machine room 56 and a radiator (not shown). For example, the heat discharged from the discharge pipe of the compressor 24 or the compressor 24 is heat-reduced by heat-exchanging with the antifreeze 57 in the heat storage tank 52, and it can accumulate to the antifreeze 57. In addition, in the radiator 92 provided in the machine room 56, the fan which accelerates heat dissipation is often provided. Therefore, the heat storage tank 52 is installed in a place where heat is exchanged 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 by the pipe 55, the discharge port and the cooler 7 of the circulation pump 51 by the pipe 53, and the cooler 7 by the pipe 52. ) And the heat storage tank 52 are respectively connected. The antifreeze 57 after heat-exchanging with the cooler 7 flows through the pipe 54. When the liquid level of the antifreeze 57 filled in the heat storage tank 52 is below the connection position of the pipe 54 and the heat storage tank 52, the circulation pump 51 is rotated in reverse to prevent the antifreeze circulation pipe 58 ( Antifreeze 57 may be recovered. Here, the antifreeze circulation pipe 58 is provided in direct contact with the cooler 7. The anti-freeze 57 does not remain in the antifreeze circulation pipe 58 due to the reverse rotation of the circulation pump 51, and the heating load when freezing during the cooling operation or when the cooler 7 is solely heated by the defrost heater 22. Can be reduced.

4, the peripheral part of the cooler 7 arrange | positioned at the back side of the lower freezer compartment 5 of the refrigerator 1 is shown in a back side sectional view. The defrost sensor 41 is provided in the upper part of the cooler 7, and the control means 66 (refer FIG. 3) performs control determination regarding defrosting operation based on the temperature which the defrost sensor 41 detected. . The defrost heater 22 which is used conventionally is arrange | positioned under the cooler 7. As shown in FIG. The defrost heater 22 is comprised from the glass tube 44 which has an electric heater inside, and the metal heat radiation fin 45 provided in the circumference | surroundings of the glass tube 44. As shown in FIG. Instead of the metal pins 45, the glass tube 44 may be a double glass tube. Any defrost heater 22 is also employed in the refrigerator 1 using a combustible refrigerant. Even if the flammable coolant leaks in the furnace, the outer glass tube surface temperature is lower than the ignition point temperature of the flammable coolant, so that the flammable coolant can be prevented from firing. The defrost water dripping prevention part 43 is provided in the upper part of the glass tube 44. Defrost water is dripped directly into the glass tube 44 heated at high temperature, and the glass tube is prevented from being damaged by a sudden temperature change.

In order to heat the cooler 7 by heating the cooler 7 and the antifreeze 57, an antifreeze circulation pipe 58 is provided so as to be in direct contact with the cooler 7 separately from the refrigerant pipe of the refrigerating cycle. And this antifreeze pipe 58 is caulking between the fins of each stage which comprises the cooler 7. As shown in FIG. Although there exists a flow direction of the antifreeze 52 in the antifreeze circulation pipe 58 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 reasons.

In this embodiment, after the frost attached to the cooler 7 is completely melted, the cooler 7 is heated by the defrost heater 22 alone in order to increase the reliability at the time of defrosting. Since the antifreeze inflow part 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 upper temperature. That is, when the defrost heater 22 is turned ON and switched to single heating, the cooler 7 starts to increase the temperature from the lower part toward the upper part sequentially. When the defrost sensor 41 provided in the upper part of the cooler 7 detects predetermined temperature, heating by the defrost heater 22 is complete | finished. Therefore, if the temperature of the lower part of the cooler 7 is raised before the defrost heater 22 is switched to single heating, the single heating time by the defrost heater 22 which greatly affects the amount of power consumption can be shortened.

The defrosting operation using the cooler 7 and the defrost heater 22 configured in this way will be described below. When the circulation pump 51 is operated, the antifreeze 57 in the heat storage tank 52 flows into the antifreeze circulation pipe 58 provided in the cooler 7 via the pipes 55 and 53. At that time, the frost is melted by heat exchange with frost attached to the cooler 7. The temperature of the antifreeze 57 heat exchanged in the cooler 7 is lowered. The antifreeze 57 passing through the cooler 7 is returned to the heat storage tank 52, and again circulates through the same path for a predetermined time.

The connection part on the side of the heat storage tank 52 of the pipe 54 returned to the heat storage tank 52 is provided at a position above the liquid level of the antifreeze 57. Therefore, when the circulating pump 51 is rotated in reverse, the circulating pump 51 blows air instead of the antifreeze 57, so that the antifreeze 57 in the antifreeze circulating pipe 58 directly contacting the cooler 7 It is pushed back into the heat storage tank 52 by the blowing force. As a result, the antifreeze 57 can be completely recovered from the antifreeze circulation pipe 58, thereby preventing freezing of the antifreeze 57 in the antifreeze circulation pipe 58. In addition, since the antifreeze 57 is not left in the antifreeze circulation pipe 58, the load is reduced when the cooler 7 is heated by the defrost heater 22, which stopped the circulation pump 51, in addition to the freezing prevention during the cooling operation. can do.

The state of energy saving in the refrigerator 1 which concerns on this invention mentioned above is demonstrated using FIG. 5 and 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 heat quantity Q required for defrost was obtained only from the defrost heater (electric heater) provided in the lower part of the cooler 7, and the cooler 7 was heated and defrosted. Therefore, the amount of heat Qe which the defrost heater heats is equivalent to the amount of heat Q required for the defrost.

In contrast, in the refrigerator 1 of the present invention, as described above, a heating source other than the defrost heater 22, that is, high internal heat energy Qin and high external heat energy Qex is used. Therefore, the heat quantity Q used for defrost is Q = Qe '+ Qin + Qex including these heat sources. In these three types of heating sources, heating by the electric heater 22 has the largest power consumption.

In the refrigerator 1 of this invention, since it has a heating source other than the defrost heater 22, the heating amount Qe by the electric heater 22 can be made into the heating amount Qe 'smaller than this heating amount Qe, and is necessary for defrosting. Even if the heat quantity Q is the same, the power consumption amount E can be reduced. In addition, since the defrost using the high internal heat energy and the high external heat energy can be made, the heat transfer phenomenon between the heating source and the frost is promoted, and the amount of heat Q necessary for the defrost can be reduced to Q '. Thereby, the power consumption at the time of defrosting can be further reduced.

Here, when heating the cooler 7 by the high internal heat energy Qin, the air itself in the refrigerating chamber 2 containing the vegetable chamber 6 becomes a heat source. The only energy required to obtain the high heat resistance Qin is the fan power when the internal fan 9 is operated. When the inside pan 9 is operated, the air of the refrigerating chamber 2 including the vegetable chamber 6 is blown to the cooler 7 part to become a heat source when melting frost. In addition, the frost is melted and heat-exchanged to be cold, and returned to the refrigerating chamber 2 including the vegetable chamber 6 to become a cooling source. When the cooler 7 is heated by the high external heat energy Qex, since the outside air is basically used as the heat source, the required electric power is equal to the pump power when the circulation pump 51 is operated.

If the conventional electric power amount is Ee (= Qe), as described above, this electric power value Ee is equal to the electric power amount of the electric heater consumed by the defrost heater. On the other hand, in the refrigerator 1 of the present invention, the amount of power of the defrost heater 22 corresponds to the amount of heat Qe ', the amount of power of the internal fan 9 corresponds to the amount of heat Qin, and the amount of power of the circulation pump 51 is the amount of heat Qex. Equivalently, power consumption Ee 'is equal to the sum of the three power amounts.

Here, the amount of power consumed by the defrost heater 22 is about 150 W, whereas the amount of power consumed by the in-vehicle fan 9 and the circulation pump 51 is about several W, respectively, so that the amount of power of the defrost heater 22 is reduced. This greatly contributes to the reduction of power consumption during defrosting. Therefore, in the present invention having a mode of heating by heating means other than the defrost heater 22, the amount of power consumed by the defrost heater 22 is reduced, so that the amount of power consumption of the entire refrigerator 1 in the defrost is reduced to Ee. It becomes possible to cut into '.

Next, various operation modes of the defrosting operation will be described with reference to FIGS. 7 to 14.

[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, control means for controlling the refrigerator compartment damper (R damper) 20 and the freezer compartment damper (F damper) 50, the in-vehicle fan 9, the circulation pump 51, the machine room fan 68, and the defrost heater 22. The defrost sensor temperature T _S and the refrigerating chamber temperature T _R at the time of 66 control are shown with the operation state of each control apparatus. 3, the control means 66 is provided in the corner part of the upper back side of the refrigerator 1, and has the CPU 66a and the memory means 66b.

Time t1 is the start of defrosting operation, time t2 is the time to switch to independent heating of the defrost heater 22, and time t3 is the time when defrosting operation is complete | finished. 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 T _S detected by the defrost sensor 41 is T _S = T 1.

By the way, the operation state of the refrigerator 1 before the time t1 which starts defrosting operation is generally a cooling operation. At this time, the refrigerator compartment damper (R damper) 20 is opened and the refrigerator compartment cooling operation to close the freezer compartment damper (F damper) 50, or the refrigerator compartment damper (R damper) 20 is closed and the freezer compartment damper (F damper). The freezer compartment cooling operation to open (50) or open both the refrigerator compartment damper (R damper) 20 and the freezer compartment damper (F damper) 50 to open the refrigerator compartment 2 (including the vegetable compartment 6). The cooling operation of both the freezer compartments 4 and 5 is determined by the temperature state in the refrigerator 1 at that time. In any state, the in-vehicle fan 9 is on. Moreover, the machine room fan 68 is turned on or off according to the temperature detected by the sensor 60 installed in the machine room 56, and is normally in an on state when the outside air temperature is high.

In the present embodiment, since the temperature in the refrigerating chamber 2 rises before the time t1 of the start of the defrosting operation, the freezer compartment cooling is performed. That is, the refrigerator compartment damper (R damper) 20 is closed, the freezer compartment damper (F damper) 50 is opened, the inside 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 fan 9 in the refrigerator, turns on the circulation pump 51, turns on the machine room fan 68, and defrost heater ( 22) is set to OFF (step S2). That is, cold air generated in the cooler 7 is guided only to the refrigerating chamber 2 and the vegetable chamber 6, and not to the upper and lower freezing chambers 4 and 5. As described above, since the cooler 7 is heated during the defrosting operation, the cooler 7 may not realize the freezing temperature.

The defrosting operation is a defrosting operation using high internal heat energy by operating the internal fan 9 and high external heat energy by circulating 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 57 is lowered. In order to compensate for the amount of heat dissipated from the antifreeze circulation pipe 58 to frost, the machine room fan 68 is operated to promote the heat storage of the external heat energy to the antifreeze 57. The heat storage tank 52 is provided with a temperature sensor 60. The temperature of the antifreeze 57 is detected, and the control means 66 controls the machine room fan 68 which is being defrosted. If the temperature of the antifreeze 57 is lower than that of the outside air during the defrosting operation, the machine room fan 68 is operated.

The state of implantation and melting in the cooler 7 in this defrosting operation state is schematically shown in FIG. 9A. From the defrosting operation start time t1 to the time t2 which is switched to the single heating by the defrost heater 22, the defrosting layer grown in the cooler 7 is mainly outside the defrost which operates the in-vehicle fan 9 and uses high heat-resistant energy. From. The circulating air 61 circulated to the refrigerating chamber 2 including the vegetable chamber 6 also passes through the inside of the frost layer, but the frost is melted from the outside. On the other hand, in the defrost which operates the circulation pump 51 and uses high external heat energy, frost is heated from the antifreeze circulation pipe 58 provided in the cooler 7. As a result, the frost is melted from the inside to form the fusion portion 63. Therefore, melting occurs from the outside and the inside of the frost layer attached to the cooler 7, and the heat transfer of air and frost is promoted by the forced convection passing through the cooler 7, and the frost can be melted quickly and uniformly. .

Returning to FIG. 7, since the temperature T _S detected by the defrost sensor 41 is the temperature of the cooler 7, when the defrosting operation is started, the temperature T _S is determined by the antifreeze 57 or the like in the antifreeze circulation pipe 58. up from _S = T1 to T = _S 0 ℃ which frost starts to melt. Here, the time from the time t4 to t5 is frost melting time, and since the phase changes from frost to water, the defrost sensor temperature T _S is almost T _S = 0 ° C. = constant. In the meantime, since the inside fan 9 is operating, the latent heat of fusion is removed from the circulating air 61, and the circulating air 61 which has passed through the cooler 7 is cooled, and the circulating air 61 is the vegetable chamber 6 and Guided to the refrigerator compartment (2) to cool the vegetable compartment (6) and the refrigerator compartment (2). Here, since the inside fan 9 is operating, the refrigerator compartment temperature T _R falls. And between time t4-t5 which frost melts, it maintains a stable refrigeration temperature.

When the defrosting operation using the high internal energy and the high external energy is continued, when the temperature T _S detected by the defrost sensor 41 reaches a temperature equal to or higher than the freezing point temperature, that is, when T _S = T2 (step S3), the cooler 7 As the attached frost has disappeared, in order to melt the frost which may remain around the cooler 7, it is switched to the defrosting operation of the defrost heater 22 (step S4). This temperature T2 is made into the temperature of 1 degreeC just after completion | finish of melting of frost, for example.

That is, since 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 defrosting. The control means 66 switches the heater 22 to the on state. When the defrost sensor temperature T _S reaches T _S = T 2, the frost of the cooler 7 melts, but frost may remain on the periphery other than the cooler 7. Defrosting is performed independently by the defrost heater 22 provided in the lower part of the).

In the present embodiment, when the defrosting is performed by the heater 22, the freezing chamber damper (F damper) 50 is provided for promoting natural convection of the air around the cooler 7 heated by the heater 22 Open. Thereby, the circulation flow by natural convection which flows to the cooler 7-freezer damper (F damper) 50-freezer rooms 4, 5-freezer compartment return port 17-cooler 7 is produced | generated.

Since the heated air passes through the freezer compartment damper (F damper) 50 and enters the freezer compartments 4 and 5, the heat load of the freezer compartments 4 and 5 is increased. However, the time to defrost alone by the heater 22 is a small time after the frost of the cooler 7 melts to the last, and the time that the heated air flows into the freezer compartments 4 and 5 also differs from the conventional defrosting time of the conventional heater alone. In the short time which cannot be compared, the one which opened the freezer compartment damper (F damper) 50 as a whole can defrost effectively. In addition, it is easy to generate a circulation flow on the freezer compartment 4 and 5 side as mentioned above, but since it is difficult to generate a circulation flow on the refrigerator compartment 2 side, the refrigerator compartment damper (R damper) 20 is closed. The fan 9 inside the refrigerator is turned off.

In the heating by the defrost heater 22, the heating load increases in the state where the antifreeze 57 remains in the antifreeze circulation pipe 58. Therefore, the circulation pump 51 is reversely rotated when the defrost sensor temperature T _S becomes T _S = T 2. Thereby, the antifreeze in the antifreeze circulation pipe 58 can be recovered to the heat storage tank 52. The temperature of the cooler 7 at the end of defrosting is about 40 ° C. in the lower part of the cooler 7 close to the defrost heater 22 although the defrost sensor temperature T _S at the top of the cooler 7 is T _S = about 10 ° C. There may be. The temperature of the antifreeze 57 after using the high external heat energy is lowered because the frost is dissolved. When the defrost sensor temperature T _S is higher than the temperature of the antifreeze 57 measured by the temperature sensor 60 installed in the heat storage tank 52, the circulation pump 51 is operated to recover the heat of the cooler 7. Good to do. As a result, 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.

The state around the cooler 7 at the time of heating the cooler 7 by the defrost heater 22 alone is shown schematically in FIG. 9B. FIG. 9B is a view of the defrost cooler 7 similar to FIG. 9A. In this state, no conception is seen in the cooler 7, and air 62 around the lower part of the cooler 7 heated by the defrost heater 22 flows from below to upward. At this time, the temperature starts to rise toward the upper portion of the cooler 7, and at the same time, the wall surface of the periphery of the cooler 7 is also heated, so that no frost residue remains.

When the defrost sensor temperature T _S becomes T _S = T 3 (step S5), the independent defrosting operation by the defrost heater 22 is terminated (step S6).

When the defrosting operation is finished, the cooling operation is resumed. Therefore, I turn on the fan in the high school. As before the defrosting operation, the state of the cooling operation differs depending on the internal temperature of the refrigerator 1 after the completion of the defrosting operation. However, in the present embodiment, the refrigerating chamber 4 (including the vegetable chamber 6) and the freezing chambers 4 and 5 are used. It cools and cools, and both the refrigerator compartment damper (R damper) 20 and the freezer compartment damper (F damper) 50 are opened, the inside fan 9 is turned on, and the machine room fan 68 is turned on.

According to the present embodiment, it is possible to perform defrosting using heating sources other than a defrost heater that uses electrical energy, that is, high internal heat energy and high external heat energy with a small amount of power consumption. In other words, when cooling the refrigerating chamber using the latent heat of fusion of frost, frost is used as a heat source, and frost is used as high heat energy from the cooler surface side (outer side) and by using high heat energy. Since the heating means which melt | dissolves from the outer surface side (inner side) of frost is used, cooling by using the latent heat of fusion of frost can be carried out efficiently by reducing input energy.

[Second mode]

A second mode of defrosting operation according to the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a time chart of defrosting operation similar to that shown in FIG. 7, and FIG. 11 is a flowchart of defrosting operation control. This mode is a mode suitable for the case where the amount of implantation is large. The first mode differs from that of the defrost heater 22 in which the heating start is accelerated, and the defrosting using the high heat energy due to the operation of the internal fan 9 and the high heat energy due to the operation of the circulation pump 51 is terminated. Before, the defrost heater 22 is turned on. When the amount of implantation is large, that is, it takes time until the time t5 when the melting of the frost is completed, the heat source is insufficient only by the high internal heat energy and the high external heat energy. There is concern that the price will rise. Therefore, in the 2nd mode, before reaching time t2, the defrost heater 22 is operated as a heating source, and the defrost time is shortened. The temperature and operating state in the refrigerator 1 before and after defrosting operation are the same as in the embodiment of FIG. 7.

More specifically, once a day or when the operation time of the compressor 24 reaches a predetermined time, the defrosting operation mode is started (step S7). This time is time t1. Open the R damper 20, close the F damper 50, turn on the internal fan 9, turn on the circulation pump 51, turn on the machine room fan 66, turn off the defrost heater 22 ( Step S8), defrosting operation is started. If the temperature T _R of the freezing chamber 2 becomes T _R = TF2 or more (step S9) during the time before the time t5 when the melting of the frost is completed (step S9), the deterioration of the shelf life of the food stored in the freezing chambers 4 and 5 is feared. Therefore, although the frost is melting, the defrost heater is turned on (step S10). Here, time t5 is time when fusion of frost is completed, time t6 is time when freezer temperature T _R becomes T _R = TF2.

When the defrost sensor temperature T _S becomes T _S = T 2, 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, and the machine room fan 66. Is switched off, and the defrost heater 22 continues the on state (step S12). The cooler 7 is heated by using the defrost heater 22 alone until the defrost sensor temperature T _S reaches a temperature T _S = T 3 which is a temperature equal to or higher than the freezing point.

In this defrost operation mode, in order to cool the refrigerating chamber 2 using the latent heat of fusion of frost, the energy input is made as low as possible, and defrosting operation (t4 to t5) using high internal heat energy and high external heat energy as a heat source is performed. Cooling of the refrigerating chamber 2 using the latent heat of fusion of frost is realized. In the case of a large amount of frosting, the defrost heater 22 is added to the heating source before the frost is completely melted, thereby shortening the time (˜t5) at which the frost is completely melted.

[Third mode]

Another mode of defrosting operation according to the present invention will be described with reference to FIG. 12. 12 is a time chart of defrosting operation similar to those of FIGS. 7 and 10. It is a defrosting operation mode suitable for a small amount of implantation. When the amount of implantation is small, the time interval t4 to t5 at which frost melts is short. In addition, the rise of the temperature T _S detected by the defrost sensor 41 is rapid. Therefore, the temperature gradient from the start of defrost to the start of fusion of frost when there is little frost is measured beforehand. Using this value as a reference value, if the temperature gradient is smaller than this, it is judged that the frost is small. The temperature and operating state in the refrigerator 1 before and after the defrosting operation are the same as in the embodiment of FIG. 7.

When it is judged that the amount of implantation is small, the in-vehicle fan 9 is operated until time t1-t4, and defrost by high heat-resistant energy is performed. When it is determined that the temperature gradient is larger than this reference value and the amount of implantation is not small, the first defrosting operation mode shown in Fig. 7 is entered. Specifically, until the time t7 at which the amount of implantation is determined, similarly to the first defrosting operation mode, the R damper 20 is opened, the F damper 50 is closed, and the internal fan 9 is turned on, and the circulation pump 51 is turned on. The defrosting operation is started by turning on the machine room fan 68 and turning on the defrost heater. Here, the defrosting operation start time t1 is determined from the predetermined time once a day, the operation time of the compressor, or the like.

At the judgment time t7 of the amount of implantation at which the defrost sensor temperature T _S is still below the freezing point, if the defrost sensor temperature T _S is equal to or less than the predetermined reference value T7, frost is melted until the defrost sensor temperature T _S reaches the freezing point temperature. Until the start, the circulation pump 51 is turned off and the machine room fan 66 is turned off to heat the cooler 7 only by circulation of the cold air by the fan in the refrigerator. At the time t4 at which the defrost sensor temperature T _S becomes the freezing point temperature, the circulation pump 51 is turned on again and the machine room fan 66 is turned on to compensate for the lack of the heating amount. Thereafter, it is the same as the first defrosting operation mode shown in FIG. 7.

[4th mode]

The 4th defrosting operation mode which concerns on this invention is demonstrated using FIG. 13 and 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 in which defrosting operation is started when the defrosting sensor temperature T _S reaches the lower limit temperature T0. The concentration of the antifreeze 57 filled in the heat storage tank 52 is adjusted to determine the freezing temperature of the antifreeze 57. The temperature and operating state in the refrigerator 1 before and after the defrosting operation are the same as in the embodiment of FIG. 7.

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

In the refrigerator 1, a quick freezing operation is performed when rapidly freezing. In this quick freezing operation, however, the temperature of the cooler 7 is lower than that of a normal cooling operation. The antifreeze 57 is prevented from being raised by raising. In order to solve the problem in the conventional defrosting operation by responding to the change in the concentration of the antifreeze 57, in the fourth defrosting operation mode, freezing prevention in the pipe can be prevented without increasing the concentration of the antifreeze. .

Defrost is started at predetermined temperature T0 below the freezing temperature of the antifreeze 57 filled in the heat storage tank 52 (step S15). If the circulation pump 51 is operated at this temperature, there is a fear that the antifreeze liquid is frozen 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 defrost heater. (22) is turned off (step S16). That is, only the point which turns off the circulation pump 51 is different from the 1st defrosting operation mode shown in FIG. The defrosting operation is continued for a while only by the heat storage of the internal energy by the internal fan 9 and the external energy by the machine room fan 68. Then, when the defrost sensor temperature T _S rises to a temperature T1 exceeding the freezing temperature of the antifreeze 52 (step S17), the circulation pump 51 is turned on to heat the cooler 7 by the antifreeze 52 ( Step S18). After that, it is the same as the 1st defrosting operation mode shown in FIG. 7 (step S20-step S24). Further preferably, in place of step 16, after the start of the defrost operation, to leave the fan in chamber 9 and the circulating pump 51 is stationary for a moment, to wait that the defrost sensor temperature T _S increases.

In addition, similarly to the second defrosting operation mode shown in FIGS. 10 and 11, when the freezing chamber temperature rises above TF2 before the melting of the frost is completed (time t5) due to too many frosts, the defrost heater 22 The heating start of) is accelerated and turned on. That is, in the case where the freezing operation is stopped for a long time (step S19), the defrost heater is turned on to accelerate the melting of the frost (step S20). When the defrost sensor temperature T _S reaches T2 (step S21), the defrosting sensor temperature T _S is switched to single heating of the defrost heater 22 (step S22). The defrosting sensor temperature T _S is raised to T3 by the single heating of the defrost heater 22 (step S23), and then the defrosting operation is terminated (step S24).

According to the embodiments of the present invention and the defrosting operation mode described above, since the cold heat energy of frost grown in the cooler is effectively used at the time of defrosting, cooling using the latent heat of fusion of frost can be performed while defrosting with less input energy. Therefore, the amount of power consumption can be reduced. Moreover, since it has only heating means using an antifreeze conventionally, it was difficult to suppress the temperature rise of a freezer compartment when there are many ideas of implantation. According to each of the above embodiments, defrosting according to the amount of implantation is possible, so that the defrosting time can be shortened when the amount of implantation is small, and the increase in temperature of the freezer compartment temperature can be suppressed when the amount of implantation is large, Problems can be prevented.

In the refrigerator, the frost mainly occurs in the cooler, but in addition to the cooler, the frost may also grow in the vicinity of the air passage surface (solid wall surface) in which the cooler is housed or the circulation fan inside the refrigerator. In a defrost using a conventional antifreeze, since the cooler is directly heated, the heat transfer of the antifreeze serving as the heating source and the frost attached to the cooler is promoted, but it is difficult to reliably dissolve the frost at a place away from the cooler. In this embodiment, since the defrost heater is mainly used for the defrost at a place spaced from the cooler, the amount of electric power may be a little, and the defrosting of each part of the refrigerator can be reliably defrosted.

In the refrigerator shown in the above embodiment, energy is saved because defrosting is performed using a heating source other than a defrost heater (electrical energy), that is, high internal heat energy and high external heat energy with a small amount of power consumption.

1: refrigerator
2: cold storage room
2a, 2b: door
2c: spout
3: ice making room
3a: door
3b: storage container
4: upper freezer
4a: door
4b: storage container
5: lower freezer
5a: door
5b: storage container
6: vegetable room
6a: door
6b: storage container
6d: Vegetable Room Return
7: cooler
8: cooler storage room
9: high fan
10: insulation box
11: cold room ventilation duct
12: upper freezer blowing duct
13: lower freezer blowing duct
17: freezer return port
18: vegetable room return duct
18a: vegetable chamber return outlet
20: refrigerator compartment damper (R damper, first opening and closing means)
21: evaporating dish
22: defrost heater (first heating means)
23: barrel
24: compressor
25: vacuum insulation
27: drain hole
28, 29: insulation partition wall
32: door pocket
36 shelves
40: freezer compartment front partition
41: defrost sensor
43: defrost water drop prevention unit
44: glass tube
45: metal fin (heat sink fin)
46: cold air return to the refrigerator
50: freezer compartment damper (F damper, second opening and closing means)
51: circulation pump
52: heat storage tank
53 to 55: pipe
56: machine room
57: Antifreeze
58: antifreeze circulation pipe
59: Frost
60 sensor
61: circulating air
62: heating air
63: melting part
66: control means
66a: CPU
66b: memory means
68: machine room fan
71 to 73: cold air (flow)
91: machine room cover
92: radiator
93: compressor support
94: machine room base
96: inlet
97: discharge port

Claims (9)

A refrigerating cycle having a refrigerating compartment and a freezing compartment, the refrigerating cycle including a cooler and a compressor for generating cold air for cooling the refrigerating compartment and the freezing compartment, first opening / closing means for opening and closing a flow path for inducing cold air generated in the cooler to the refrigerating compartment; A second opening / closing means for opening and closing the flow path leading to the cool air generated in the cooler to the freezer compartment, an internal fan for blowing the cool air generated in the cooler to at least one of the refrigerating compartment and the freezing compartment, and being disposed below the cooler. First heating means having a heater, second heating means including the first and second opening / closing means and the in-vehicle fan, and heating the cooling chamber by air having a temperature rise by circulating the refrigerating chamber, and contacting the cooler. And the circulation pump circulating the antifreeze and the circulation pump and the compressor. Is a third heating means having a machine room fan for accumulating at least one of heat and external air to the antifreeze, the first and second opening and closing means, the internal fan, the circulation pump, the machine room fan, and the first heating. A control means for controlling the operation of the means, wherein, during the defrosting operation, the control means heats the cooler by using at least one of the first to third heating means, and the air flows through the cooler portion. A refrigerator, characterized in that to cool the refrigerator compartment. The refrigerator according to claim 1, wherein the control means operates the second and third heating means before the first heating means is activated during the defrosting operation. The refrigerator according to claim 1 or 2, wherein said control means operates said first heating means after heating by said second and third heating means. The said 2nd heating means uses the air after having circulated the air in the refrigerator temperature of the refrigeration temperature by the said fan in the inside of a refrigeration temperature, The said 3rd heating means is a temperature range of plus temperature to an antifreeze. Refrigerating heat, characterized in that to heat transfer the antifreeze to the cooler. The defrost sensor according to claim 1 or 2, wherein a defrost sensor is provided near an antifreeze outlet in a portion where the third heating means contacts the cooler, and the temperature detected by the defrost sensor is frozen within a predetermined time from the start of defrosting. When not exceeding a predetermined temperature, the control means operates the heating by the first heating means in addition to the heating of the second and third heating means. The defrost sensor according to claim 1 or 2, wherein a defrost sensor is provided near an antifreeze outlet in a portion where the third heating means contacts the cooler, and the control means has a temperature detected by the defrost sensor at a freezing temperature of the antifreeze. Refrigerator, characterized in that not operating the circulation pump until it exceeds. The refrigerator according to claim 5, wherein the control means does not operate the circulation pump until the temperature detected by the defrost sensor exceeds the freezing temperature of the antifreeze. The said 2nd heating means defrosts the idea of the said cooler from the outer surface side of this idea, and the said 3rd heating means defrosts the idea of the said cooler from the surface side which contacts the said cooler. Refrigerator characterized in that. 3. The control means according to claim 1 or 2, wherein the control means operates the first opening / closing means to guide the cool air generated by heating the frost attached to the cooler by the second heating means to the refrigerating compartment. To do, refrigerator.

Images