KR101179371B1 - Refrigerator - Google Patents

Abstract

(Problem) An object of the present invention is to provide a refrigerator having high energy saving performance and high reliability, in which a problem that food in the refrigerator cannot be maintained within a predetermined temperature range is unlikely to occur.
(Solution means) When the compressor is stopped, the first defrost means for closing the freezer compartment damper, leaving the refrigerating compartment damper open, leaving the defrost heater non-energized, and operating the blower to perform defrost, and at the stop of the compressor, The second defrost means for defrosting the freezer compartment damper, leaving the refrigerator compartment damper open, the defrost heater energized, operating the blower to perform defrosting, and closing the freezer compartment damper when the compressor is stopped and the refrigerator compartment damper closed. And a plurality of defrosting modes including a third defrosting means for energizing the defrosting heater, defrosting the blower in a stopped state, and performing defrosting operation by combining one or a plurality of the first to third defrosting means. The defrosting operation is performed by selecting one defrost mode from a plurality of defrosting modes, and then defrosting the heater with the energized state and defrosting with the blower stopped. The.

Description

Refrigerator {REFRIGERATOR}

The present invention relates to a refrigerator, in particular a refrigerator which automatically performs a defrosting operation for removing frost attached to the cooler.

In the refrigerator of the cold air forced circulation system which cools a refrigerating compartment (corresponding to the refrigerating temperature compartment in this invention) and a freezer compartment (corresponding to the refrigeration temperature compartment in this invention) with a common cooler, the conventional technique which melts frost As a technique, patent document 1-the patent document 4 shown below are known.

Patent Literature 1 describes a technique for defrosting as a defrost heater energized state in a compressor stopped state, an entire damper closed state, and an air blower stopped state.

Patent Document 2 discloses a refrigerator blower in which the refrigerator compartment damper is opened and the freezer damper is closed when the integration of the operating time of the compressor reaches a predetermined value during the normal cooling operation or when the user turns on the manual humidification switch. A technique is described in which a dehumidification operation is terminated after a predetermined time has elapsed or when the cooler has risen to a predetermined upper limit temperature by operating the humidification operation.

Patent Document 2 further discloses that when the integrated value of the operating time of the compressor reaches a predetermined value, the defrost heater is energized, the refrigerator compartment damper is opened, the freezer compartment damper is closed, and the blower is operated to operate the humidifier. The technique of performing (and defrosting operation) is described.

In addition, Patent Document 3 discloses an air blower that stops the compressor, energizes the defrost heater, closes the freezer compartment damper, and opens the refrigerating compartment damper in the open state when the accumulated operation time of the compressor becomes longer than a predetermined time. Humidification operation (and defrosting operation) in the refrigerating compartment is performed by operating the controller, and when the temperature of the refrigerating compartment becomes higher than or equal to the predetermined temperature, the electricity supply to the defrost heater is stopped and the refrigeration operation in the refrigerating compartment is resumed by resuming the operation of the compressor (refrigerating compartment temperature recovery operation). Techniques for doing this are described.

In addition, Patent Document 4 discloses that the refrigerator compartment damper is opened in the compressor stop state before the defrost heater is energized during the defrosting operation, and returns the cool air in the refrigerating chamber having a relatively high temperature to be returned to the cold air discharge duct by operating the high temperature blower. When a temperature is raised and the temperature of a cooler becomes higher than predetermined temperature, the technique which stops a high temperature blower, turns on a refrigerator compartment damper, and energizes a defrost heater and defrosts is described.

Patent Document 1: Japanese Patent Application Publication No. 2002-31466 Patent Document 2: Japanese Patent Application Laid-Open No. 2001-280784 Patent Document 3: Japanese Patent No. 3912233 Patent Document 4: Japanese Patent Application Laid-Open No. 2003-83667

However, in the above-mentioned prior art, the energy saving performance is not high enough and reliability is low in that defrosting is performed definitely, or the refrigerator compartment temperature and the freezer compartment temperature during defrosting are kept below each predetermined temperature. The reason is explained below.

First, the problem of the prior art regarding energy saving performance is demonstrated. In the refrigerator provided with the cooler which cools a refrigerator compartment and a freezer compartment in common, the 1st system for melt | dissolving the frost of this cooler is the compressor stop state, the whole damper closed state, and the air blower stop state which are described in patent document 1, Defrost heater is a method of heating the frost to melt. The energy saving performance of this system can be explained by considering the heat transfer efficiency between the [1] defrost heater and frost and the handling of cold heat of [2] frost. First, [1] the heat transfer efficiency between the defrost heater and frost. In the method of heating the frost by the defrost heater described in Patent Document 1, the heat transfer from the defrost heater to the frost is basically caused by natural convection. Because of this (although copying is generally dominant, natural convection), the heat transfer efficiency between the defrost heater and frost is low. Therefore, in order to provide the required amount of heat to frost, more input is needed for a defrost heater, and energy saving performance is low. [2] The handling of cold heat of frost is described next. Since the refrigerating chamber is a chamber usually maintained at about 3 to 5 ° C., the frost that phase changes (melts) at 0 ° C. can be considered as a cooling heat source capable of cooling the refrigerating chamber. In view of this point, the method of heating and melting frost by the defrost heater described in Patent Document 1 (first method) is to discard the cooling heat of the available frost without reusing the cooling of the refrigerating compartment, thereby sufficiently increasing the energy saving performance. There was no.

In the refrigerator provided with the cooler which cools a refrigerating compartment and a freezer compartment in common, the 2nd system for melt | dissolving the frost of this cooler is the refrigerator compartment damper state in the compressor stop state, and the freezer compartment damper state as described in patent document 2. The defrost heater is kept in a non-energized state, and the refrigerator in the refrigerator is operated to humidify the refrigerator compartment. This second method is aimed at humidification, and since the frost also melts in this method, the second method will be described here. In this case, the input to the defrost heater is zero, and the energy input from the outside becomes only the power of the internal blower (generally small enough compared with the input of the defrost heater), and the air cooled by frost is supplied to the refrigerating chamber.

That is, the energy saving performance is very high because the cold compartment is cooled by using the cold heat of frost. However, it is difficult to perform complete defrosting by this 2nd system. This is because when the refrigerator damper is opened while the compressor is stopped and the freezer damper is closed, and the blower blower is operated, it takes time to melt the frost. Therefore, when defrosting (complete defrosting) is performed, the damper is closed. This is because a problem occurs that the temperature of the freezer compartment which stops blowing increases. Therefore, the 2nd system for melt | dissolving the frost of the cooler described in patent document 2 is not suitable as a defrosting system of the refrigerator provided with the cooler which cools a refrigerator compartment and a freezer compartment in common.

In the refrigerator provided with the cooler which cools a refrigerator compartment and a freezer compartment in common, the 3rd system for melt | dissolving the frost of this refrigerator is the state which opened the refrigerator compartment damper in the compressor stop state of patent document 2 or patent document 3, and the freezer compartment. The damper is set to the closed state and the defrost heater energized state to operate the blower in the refrigerator. This third method is for humidification purposes, and since the frost melts even in this method, the third method will be described here. The energy saving performance of this system will be described with reference to FIG.

FIG. 12 shows a humidification operation by energizing a defrost heater and blowing air to the refrigerating chamber by an air blower installed in the freezer while the cold air circulation to the freezing chamber is interrupted when the compressor described in Patent Document 2 or Patent Document 3 is stopped. It is a time chart which shows the change of the temperature in a refrigerating chamber, the refrigerating chamber discharge air temperature, and a cooler temperature at the time of performing. The air returned from the refrigerating chamber is heated by the defrost heater to raise the temperature. Here, in order to enhance the effect of humidification, the return air from the refrigerating chamber may be allowed to flow to the cooler in a state where the temperature is sufficiently increased by the defrost heater to lower the relative humidity (with the amount of saturated steam increased). As a result, more water (or frost) on the surface of the cooler evaporates (or sublimes), so that air containing a lot of moisture can be supplied to the refrigerating chamber.

On the other hand, when the temperature is sufficiently increased by the defrost heater, the temperature of the air supplied to the refrigerating compartment is also increased simultaneously. As shown in FIG. 12, the temperature of the refrigerating compartment discharge air is higher than the refrigerating compartment, and consequently the refrigerating compartment temperature is increased. Done. Therefore, in the technique described in Patent Literature 2, the refrigerating chamber temperature may increase excessively. Therefore, in the technique described in Patent Literature 3, the cooling operation in the refrigerating chamber (refrigerating chamber temperature return operation) is performed so that such a situation does not occur. have.

In addition, for the phase change (melting) of frost, from the start of frost melting to completion of frost melting, the cooler temperature is maintained at almost 0 ° C.

Thus, Patent Document 2 or Patent Document, which focuses on humidification and blows air into the refrigerating chamber by an air blower installed in the refrigerator while energizing the defrost heater while the cold air circulation to the freezer is interrupted when the compressor is stopped. In the prior art of 3, the temperature rise of the refrigerator compartment occurs, that is, the refrigerator compartment cannot be cooled. From this point, since the forced convection is formed by the air blower in the third method for melting the frost of the cooler, the heat transfer efficiency between the defrost heater and the frost is high, but the description of the first method for melting the frost of the cooler As described above, since the cold heat of the available frost cannot be reused for cooling the refrigerating compartment, the energy saving performance is lowered by that amount. That is, in the prior art of patent document 2 or patent document 3, since the purpose of humidification is not taken into consideration to improve energy saving "reuse of cold heat of frost".

For the above reason, when defrosting (complete defrosting) is performed using the conventional frost melting technique, the energy saving effect was small.

Next, the problem of the prior art regarding the reliability of performing the above-mentioned reliable defrosting or maintaining the refrigerator compartment temperature and freezer compartment temperature in defrosting below each predetermined temperature is demonstrated.

In the technique described in Patent Document 2 or the technique described in Patent Document 3, the flow field indicating the state of the flow of cold air in the cooler chamber formed by the return air from the refrigerating chamber and the cold air in the cooler chamber formed by the return air from the freezer compartment. Since the flow field which shows the state of a flow differs, when the defrost is performed by blowing into a refrigerating chamber by the air blower, consideration is not given to the presence of a place where frost is hard to melt. As a result, there is a problem that deterioration of energy-saving performance and the inability to keep food in the refrigerator within a predetermined temperature range occur even without a special mistake for the user, for example, without leaving the refrigerator door open for a long time.

In addition, in the technique described in Patent Document 4, the cold air in the refrigerating chamber having a relatively high temperature is flowed back into the cold air discharge duct by operating the air blower to raise the cooler temperature. In order to reflux the cold air in the refrigerating chamber having a high temperature not in the refrigerating chamber return duct but in the refrigerating chamber blowing duct, it is necessary to form a flow of air in a direction opposite to that in the normal cooling operation. Or a separate second blower blower for forming a flow in the opposite direction.

Usually, since a vane shape is designed so that blower efficiency may be maximized at the time of forward rotation, blower efficiency will fall significantly at the time of reverse rotation. Therefore, in order to obtain a predetermined air volume, for example, it is necessary to increase the rotational speed at the time of reverse rotation, and there arises a problem that the required power of the internal blower is increased and the noise is increased.

In addition, the installation of a second internal air blower separately in order to form the flow in the opposite direction caused a decrease in the volume of the refrigerator and an increase in cost.

In addition, the technique described in Patent Document 4 is to stop the blower in the refrigerator when the cooler temperature is higher than the predetermined temperature, to energize the defrost heater with the refrigerator compartment damper closed, and to defrost. Due to insufficient consideration, there is a possibility that the energy saving performance is low, or that the food in the refrigerator cannot be maintained within a predetermined temperature range without any special error by the user.

The reason why the above-mentioned problem occurs is described below. The cooler temperature at the time of defrost almost shows the temperature of frost, and the temperature change of the frost is the part of the sensible heat change from the minus temperature to 0 degreeC, and the 0 degree constant temperature shown at the time of melting of frost (when phase change). It is comprised by the part of latent heat change, the part of sensible heat change which temperature becomes higher than 0 degreeC after frost melt | dissolves completely. The specific heat of frost (ice) is about 2kJ / (kg? K), the fusion latent heat of frost (ice) is about 335kJ / kg, and the specific heat of water is 4.2kJ / (kg? K). In the case of melting, a very large amount of heat is required at the latent heat change (phase change).

From this point of view, when there is a relatively large amount of frost at the time of defrosting, a constant time of 0 ° C. becomes long. In other words, frost can be said to be a cold heat source capable of absorbing a great deal of heat at a constant phase change of 0 ° C. In addition, considering the energy saving performance, the defrost heater is in a non-energized state, and the defrosting system that blows air into the refrigerating chamber by the high-temperature blower is cooling the refrigerating chamber using frost cooling, that is, melting the frost by the heat load of the refrigerating chamber. The energy-saving performance is high because the effective effect and the forced convection caused by the blowing increase the heat transfer efficiency of the cooler and the blowing.

On the other hand, the defrosting system in which the high-temperature blower is energized to the defrost heater in the stopped state does not use frost cooling heat for cooling, and since the cooler and the surrounding air are natural convection, the heat transfer efficiency is lower than that of forced convection. Saving performance is low.

In consideration of the above, in the technique described in Patent Literature 4, when the set value of the cooler temperature for stopping the high-temperature blower is set to 0 ° C. or less, only the cold heat of the portion of the sensible heat change in the cold storage of frost is in the refrigerator compartment. It can be used for cooling. Therefore, the part of the latent heat change which can take out more available cooling heat for cooling the refrigerating chamber is discarded by the defrost by the defrost heater performed in the state which stopped the internal blower. As a result, the energy saving effect was small.

On the other hand, when the set value of the cooler temperature for stopping the air blower is set to a temperature higher than 0 ° C., when the amount of frost is relatively large, the time (part of the latent heat change) at 0 ° C. becomes long as described above. In the meantime, the temperature rise of the freezer compartment in which the cold air circulation has been cut off becomes remarkable, and there is a possibility that the user may cause problems such as melting of frozen foods without any special fruit.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a refrigerator having high energy saving performance and high reliability, in which a possibility that food in the refrigerator cannot be maintained within a predetermined temperature range is unlikely to occur.

In order to achieve the above object, the present invention provides a refrigeration temperature chamber, a refrigeration temperature chamber, a compressor, a cooler for cooling the refrigeration temperature chamber and the refrigerating temperature chamber, and cold air cooled by the cooler. And a blower circulating in the refrigerating temperature chamber, a freezer compartment damper for controlling the air blowing from the cooler to the freezing temperature chamber, a refrigerating chamber damper for controlling the air blowing from the cooler to the refrigerating temperature chamber, and In the refrigerator provided with a defrost heater which melts frost,
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
At a timing that defrosts the cooler while blowing the cool air cooled by the latent heat to the refrigerating temperature room so as to cool the refrigerating temperature room by the latent heat of frost attached to the cooler, and the defrost is almost completed. The cooling of the cold air to the refrigeration temperature chamber is stopped, after which the defrost heater is energized, and the defrost is performed with the blower stopped.
In addition, a refrigeration temperature chamber, a refrigeration temperature chamber, a compressor, a cooler for cooling the refrigeration temperature chamber and the refrigerating temperature chamber, and a blower for circulating cold air cooled by the cooler in the freezing temperature chamber and the refrigerating temperature chamber. And a freezer compartment damper for controlling the blowing from the cooler to the freezing temperature chamber, a refrigerator compartment damper for controlling the blowing from the cooler to the refrigeration temperature chamber, and a defrost heater for melting frost attached to the cooler. To
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
At a timing that defrosts the cooler while blowing the cool air cooled by the latent heat to the refrigerating temperature room so as to cool the refrigerating temperature room by the latent heat of frost attached to the cooler, and the defrost is almost completed. After stopping the blowing of the cold air to the refrigeration temperature chamber and performing the operation of cooling the freezing temperature chamber once or plural times,
The defrosting operation by the third defrosting means which stops the said compressor, makes the said freezer compartment damper into the closed state, puts the said refrigerator compartment damper into the closed state, energizes the said defrost heater, and defrosts with the said blower stopped. It is characterized by performing.
In addition, a refrigeration temperature chamber, a refrigeration temperature chamber, a compressor, a cooler for cooling the refrigeration temperature chamber and the refrigerating temperature chamber, and a blower for circulating cold air cooled by the cooler in the freezing temperature chamber and the refrigerating temperature chamber. And a freezer compartment damper for controlling the blowing from the cooler to the freezing temperature chamber, a refrigerator compartment damper for controlling the blowing from the cooler to the refrigeration temperature chamber, and a defrost heater for melting frost attached to the cooler. To
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
At a timing that defrosts the cooler while blowing the cool air cooled by the latent heat to the refrigerating temperature room so as to cool the refrigerating temperature room by the latent heat of frost attached to the cooler, and the defrost is almost completed. After stopping the cooling of the cold air to the refrigerated temperature chamber, and operating the compressor to perform the cooling operation of the refrigerated temperature chamber for a predetermined time,
The defrosting operation by the third defrosting means which stops the said compressor, makes the said freezer compartment damper into the closed state, puts the said refrigerator compartment damper into the closed state, energizes the said defrost heater, and defrosts with the said blower stopped. It is characterized by performing.

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According to the present invention, in the defrosting operation by the first defrosting means, the frost attached to the cooler is melted by return air from the cold storage compartment, while the cold storage compartment is cooled by latent heat of frost attached to the cooler, thereby saving energy. Is large.

In the defrosting operation by the second defrosting means, the frost attached to the cooler is further heated with return air from the refrigerating temperature chamber with the defrost heater to dissolve the frost with the subsequent air, and refrigerated as an air temperature of a temperature suitable for the refrigerating temperature chamber. It is possible to cool the temperature chamber, the heat transfer efficiency with the frost in the defrosting operation is good, and the defrosting can be performed in a shorter time than in the case of the defrosting operation by the first defrosting means. The energy saving effect is better than the defrost by only the defrost heater.

As a result, by combining the defrosting operation by the first to third defrosting means, in the defrosting operation by the third defrosting means, the energy saving effect is higher than that of the defrosting of the cooler by natural convection with the cooler by only the defrosting heater. High defrosting operation is possible.

After the defrosting operation in the defrost mode is performed, the cooler can be reliably defrosted by putting the defrost heater into an energized state and performing defrost with the blower stopped.

The defrosting operation by the third defrosting means is performed after one or more times of the defrosting operation by at least one of the first defrosting means and the second defrosting means and the operation of cooling the refrigeration temperature chamber. By shortening the energization time of the defrost heater, the power consumption can be reduced, and frost can be reliably removed without growing the frost of the cooler.

Further, when the cooling operation is performed once by stopping at the middle of the defrosting operation by at least one of the first defrosting means and the second defrosting means, the defrosting operation by the third defrosting means is performed in a predetermined cooling state. By performing after performing, defrosting can be carried out without leaving the frost remaining by the 1st defrosting means and the 2nd defrosting means without remarkably raising the temperature in the refrigerator 1.

Moreover, when the defrosting operation by the said 1st and 2nd defrosting means is less than a predetermined time, the defrosting operation by at least one of the said 1st defrosting means and the 2nd defrosting means is performed before the said 3rd defrosting means. It is characterized by.

According to the present invention, when the defrosting operation by the first and second defrosting means is less than a predetermined time, defrosting by at least one of the first defrosting means and the second defrosting means before the third defrosting means. Since driving is performed, defrosting operation with high energy saving effect can be performed.

Moreover, before performing the defrosting operation by the said 1st defrosting means, the temperature of the said refrigeration temperature chamber is raised to predetermined temperature, It is characterized by the above-mentioned.

According to the present invention, the defrosting time can be shortened by raising the temperature of the refrigeration temperature zone chamber to an acceptable temperature of the storage of the refrigeration temperature zone chamber in advance and using the refrigeration temperature zone chamber as the heat load of the defrost.

Moreover, the electricity supply amount of the said defrost heater in a said 2nd defrost means is adjusted, It is characterized by the above-mentioned.

According to the present invention, in the defrosting operation, the refrigerator is stopped, the freezer compartment damper is in a closed state, the refrigerating chamber damper is in an open state, the defrost heater is in an energized state, and the blower is operated to perform defrosting. Since the energization amount of the defrost heater is adjusted so that the temperature of the temperature chamber is maintained or lowered, the refrigerating temperature chamber is cooled by the latent heat of frost attached to the cooler and the like, and the energy saving effect is large. Further, there is no problem that the temperature of the refrigeration temperature zone chamber cannot be maintained at a predetermined value.

In addition, the rotational speed of the blower in the second defrosting means is adjusted.

According to the present invention, in the defrosting operation, the refrigerator is stopped, the freezer compartment damper is in a closed state, the refrigerating chamber damper is in an open state, the defrost heater is in an energized state, and the blower is operated to perform defrosting. Since the speed of rotation of the blower is adjusted to maintain or decrease the temperature of the temperature chamber, the refrigerating temperature chamber is cooled by the latent heat of frost attached to the cooler, thereby greatly saving energy. Further, there is no problem that the temperature of the refrigeration temperature zone chamber cannot be maintained at a predetermined value.

Moreover, the electricity supply amount of the said defrost heater in the said 2nd defrost means, and the rotational speed of the said blower are adjusted, It is characterized by the above-mentioned.

According to the present invention, in the defrosting operation, the refrigerator is stopped, the freezer compartment damper is in a closed state, the refrigerating chamber damper is in an open state, the defrost heater is in an energized state, and the blower is operated to perform defrosting. Since the energization amount of the defrost heater and the rotation speed of the blower are adjusted so that the temperature of the temperature chamber is maintained or lowered, the refrigeration temperature chamber is cooled by latent heat of frost attached to the cooler and the like, and the energy saving effect is large. Further, there is no problem that the temperature of the refrigeration temperature zone chamber cannot be maintained at a predetermined value. In addition, since the amount of energization of the defrost heater and the rotational speed of the blower are adjusted, the degree of freedom in controlling the defrosting and the temperature of the refrigerating temperature chamber is increased, making it easier to control.

Moreover, it has a 1st defrost mode which performs defrosting operation by the said 2nd defrosting means after the defrosting operation by said 1st defrosting means, In the 1st defrosting mode, defrosting operation by the said 1st defrosting means is said, The operation is finished when the difference between the temperature of the refrigerating temperature chamber and the temperature of the cooler becomes equal to or less than a predetermined temperature difference, and the defrosting operation by the second defrosting means is performed.

According to the present invention, when the difference between the temperature of the refrigerating temperature chamber and the temperature of the cooler becomes equal to or less than the predetermined temperature difference, the defrosting operation by the first defrosting means is terminated and the defrosting operation by the second defrosting means is switched. When the difference between the temperature of the cold storage compartment and the cooler temperature decreases, the effect of using the object of the cold storage compartment as the heat load of the defrost becomes small, and the defrosting time increases, and as a result, the predetermined temperature at which the temperature of the cold storage compartment is required is required. Since the possibility of rising above the temperature range also increases, the defrosting time can be shortened by appropriately switching to the defrosting operation by the second defrosting means having good defrosting efficiency.

Moreover, it has a 2nd defrost mode which performs defrosting operation by the said 3rd defrosting means after the defrosting operation by the said 2nd defrosting means, In the 2nd defrosting mode, defrosting operation by the said 2nd defrosting means is said, It terminates when the temperature of a cooler becomes higher than the predetermined 1st cooler temperature of 0 degreeC or more, It is characterized by the defrosting operation by the said 3rd defrosting means.

According to the present invention, since the defrosting operation by the second defrosting means is terminated when the temperature of the cooler becomes higher than the predetermined first cooler temperature of 0 ° C. or more, from the blower in the defrosting operation by the second defrosting means to the refrigerating temperature chamber. By the air to be circulated, it is possible to prevent the temperature of the refrigeration temperature zone from becoming a temperature exceeding a predetermined temperature range required for the refrigeration temperature zone.

In the second defrost mode, the defrosting operation by the second defrosting means is terminated when the temperature of the cooler becomes higher than the temperature of the refrigerating temperature chamber, and the defrosting operation by the third defrosting means is performed. It is characterized by.

According to the present invention, since the defrosting operation by the second defrosting means is terminated when the temperature of the cooler becomes higher than the temperature of the refrigerating temperature chamber, the air circulated from the blower in the defrosting operation by the second defrosting means to the refrigerating temperature chamber. By this, it is possible to prevent the temperature of the refrigeration temperature zone chamber from becoming a temperature exceeding a predetermined temperature range required for the refrigeration temperature zone chamber.

The defrosting operation by the third defrosting means is terminated when the temperature of the cooler rises to a temperature of a predetermined second cooler.

According to the present invention, the temperature condition of the cooler for terminating the defrosting operation by the third defrosting means can be set to a second cooler temperature different from the first cooler temperature, and the second cooler temperature is set to a predetermined temperature required for the refrigerating temperature chamber. It is possible to set the temperature higher than the temperature range, and it is possible to set the cooler to a temperature capable of completely defrosting. This enables highly reliable defrosting.

In addition, the selected defrost mode is to determine the completion of defrost by the temperature of the cooler, the defrost completion determination temperature for determining the defrost completion is characterized in that different according to the selected defrost mode.

According to the present invention, the defrost completion determination temperature of each defrost mode can be set differently, and the end state of the defrost of the cooler according to the purpose of each defrost mode can be set flexibly.

The defrosting completion determination temperature of the defrosting mode in which the defrosting operation is performed by the third defrosting means is set higher than the defrosting completion determination temperature of the defrosting mode in which the third defrosting means is not performed.

According to this invention, the defrosting completion determination temperature of the defrosting mode in which defrosting operation by a 3rd defrosting means is performed is set higher than the defrosting completion determination temperature of the defrosting mode in which 3rd defrosting means is not implemented. The defrosting operation by the third defrosting means defrosts the cooler by heat exchange by natural convection with the defrosting heater, and since the air is not circulated in the refrigerating temperature chamber like the defrosting operation by the second defrosting means, higher cooler temperature It can be set to the defrost completion determination temperature of and complete ring defrosting can be performed.

Further, during the defrosting operation in the selected defrosting mode, the third defrosting means is implemented when the temperature of the freezing temperature zone rises above a predetermined freezing temperature range upper limit temperature.

According to the present invention, when the temperature of the freezing temperature room rises above the predetermined freezing temperature room upper limit temperature during the defrosting operation, since the third defrosting means is performed, there is a problem that the contents of the freezing temperature room melt. It can prevent and defrost of a cooler reliably.

In addition, the refrigeration temperature upper limit temperature is characterized in that different depending on the selected defrost mode.

According to the present invention, since the freezing temperature room upper limit temperature can be set differently according to the selected defrosting mode, for example, in the light defrosting operation with high operating frequency, the low temperature of the freezing temperature room upper limit temperature is lowered and reliable defrosting with low operating frequency is performed. Defrosting operation refrigeration temperature room upper limit temperature can be set high, and the big frequency of the temperature change of the refrigeration temperature room room by defrosting operation can be reduced.

Further, the upper limit temperature of the freezing temperature chamber in the defrost mode in which the defrosting operation is performed by the third defrosting means is the freezing temperature limit upper limit temperature in the defrost mode in which the defrosting operation is performed by the third defrosting means. It is characterized by being set higher.

According to the present invention, in a light defrosting operation with a high frequency of operation, the defrosting operation refrigeration temperature room upper limit temperature is set high by lowering the refrigeration temperature room upper limit temperature and performing a defrost with a low operation frequency. The large frequency of can be reduced.

The refrigeration temperature room upper limit temperature in the defrost mode in which only the defrosting operation by the first defrosting means is performed includes defrosting operation by the second defrosting means or defrosting operation by the third defrosting means. It is set lower than freezing temperature zone upper limit temperature in a defrost mode.

According to the present invention, in a light defrosting operation with a high frequency of operation, the defrosting operation refrigeration temperature room upper limit temperature is set high by lowering the refrigeration temperature room upper limit temperature and performing a defrost with a low operation frequency. The large frequency of can be reduced.

Further, during the defrosting operation in the defrost mode in which the defrosting operation is performed by the third defrosting means, when the temperature of the freezing temperature chamber rises above the freezing temperature room upper limit temperature, the defrosting operation is stopped, and the freezing is performed. After the operation to cool the temperature chamber is performed, defrosting operation in a defrost mode different from the defrost mode is performed.

According to the present invention, when the temperature of the freezing temperature room rises above the predetermined freezing temperature room upper limit temperature during the defrosting operation by the third defrosting means, the defrosting operation is stopped and after the operation of cooling the freezing temperature room room, Since defrosting operation by the defrosting mode different from the defrosting mode performed until then is performed, it can prevent that repeating defrosting operation to reach several times of the same refrigeration temperature room upper limit temperature is prevented.

Further, during the defrosting operation by the defrosting mode in which the defrosting operation by the first defrosting means, the defrosting operation by the second defrosting means, and the defrosting operation by the third defrosting means are performed, When the temperature rises above the freezing temperature room upper limit temperature, the defrosting operation is stopped and the defrosting operation is performed by the defrosting mode in which the defrosting operation is not performed by the first defrosting means after the operation of cooling the freezing temperature room room. It is characterized by performing an operation.

According to the present invention, the defrosting operation by the first defrosting means, the defrosting operation by the second defrosting means, and the defrosting operation by the defrosting mode in which the defrosting operation is performed by the third defrosting means are performed. When the temperature rises above the upper limit of the freezing temperature room temperature, the defrosting operation is stopped and the defrosting operation is performed in the defrost mode in which the defrosting operation is not performed by the first defrosting means. Therefore, defrost time can be shortened.

Further, during the defrosting operation by the defrosting mode in which the defrosting operation by the second defrosting means and the defrosting operation by the third defrosting means are performed, the temperature of the freezing temperature chamber rises above the freezing temperature chamber upper limit temperature. When the defrosting operation is stopped, the defrosting operation is performed in the defrosting mode in which only the defrosting operation by the third defrosting means is performed after the defrosting operation is stopped and the operation for cooling the refrigeration temperature chamber is performed.

According to the present invention, during the defrosting operation by the defrosting mode in which the defrosting operation by the second defrosting means and the defrosting operation by the third defrosting means is performed, the temperature of the freezing temperature room has risen above the freezing temperature room upper limit temperature. In this case, after the defrosting operation is stopped and the refrigeration temperature room is cooled, the defrosting time can be shortened because the defrosting operation is performed in the defrosting mode in which only the defrosting operation is performed by the third defrosting means.

According to the present invention, it is possible to provide a refrigerator having high energy saving performance, hardly causing a possibility that food in the refrigerator cannot be maintained at a predetermined temperature range, and having high reliability.

1 is a front external view of a refrigerator according to an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view showing the constitution of the refrigerator.
3 is a front view showing the constitution of the refrigerator.
4 is a partial side view of a portion around the cooler.
5 is a partial front view of a portion around the cooler.
6 is a diagram for explaining a defrost mode.
7 is a flowchart showing a flow of control of defrosting operation.
8 is a flowchart illustrating a flow of control of defrosting operation.
9 is a flowchart showing the flow of control of defrosting operation.
10 is a flowchart showing a flow of control of defrosting operation.
11 is a time chart at the time of defrost in defrost mode 4. FIG.
12 is a time chart at the time of humidification operation in the prior art.

An embodiment of a refrigerator according to the present invention will be described with reference to FIGS. 1 to 10.

FIG. 1: is a front external view of the refrigerator of this embodiment, and FIG. 2 is X-X longitudinal cross-sectional view in FIG. 1 which shows the structure of the refrigerator. Fig. 3 is a front view showing the structure of the refrigerator, showing the arrangement of cold air ducts, blowers, and the like.

As shown in FIG. 1, the refrigerator 1 of this embodiment is comprised from the refrigerating chamber 2, the ice-making chamber 3, the upper freezer chamber 4, the lower freezer chamber 5, and the vegetable chamber 6 from upper direction. have.

Here, the refrigerating chamber 2 and the vegetable chamber 6 in this embodiment correspond to the refrigerating temperature chamber of Claim, and the ice-making chamber 3, the upper freezer compartment 4, and the lower freezer compartment 5 are described in Claim. Corresponds to the refrigeration temperature room.

The refrigerator 1 includes the left and right doors of the refrigerating chamber doors 2a and 2b divided left and right on the front side, and the ice making chamber 3, the upper freezing chamber 4, the lower freezing chamber 5, and the vegetable chamber 6, Each has a drawer-type ice-making chamber door 3a, an upper freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a. 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 doors 2a, 2b, 3a, 4a, and 5a. 6a).

In addition, the refrigerator 1 includes a door sensor (not shown) which detects an open / closed state of each door of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and a state in which the door open state is determined for a predetermined time, For example, an unillustrated alarm notifying the user when it has been continued for more than one minute, an unillustrated temperature setter for setting the temperature of the refrigerating chamber 2 or the temperature of the upper freezing chamber 4 or the lower freezing chamber 5, or the like. Equipped.

As shown in FIG. 2, the outside and inside of the refrigerator 1 are divided by the heat insulation case body 10 formed by filling a foam heat insulating material (foamed polyurethane). The heat insulation case body 10 of the refrigerator 1 mounts the some vacuum heat insulating material 25. As shown in FIG.

The inside of the chamber is divided into a refrigerating chamber 2, an upper freezing chamber 4 and an ice making chamber 3 (refer to Fig. 1, the ice making chamber 3 is not shown in Fig. 2) by the insulating partition wall 28, The lower freezer compartment 5 and the vegetable compartment 6 are divided by the heat insulation partition wall 29.

A plurality of door pockets 32 are provided on the inner side of the doors 2a and 2b (refer to FIG. 1 and the refrigerator compartment door 2b is not shown in FIG. 2). In addition, the refrigerating chamber 2 is partitioned into a plurality of storage spaces in the longitudinal direction by the plurality of shelves 36.

As shown in FIG. 2, the upper freezer compartment 4, the lower freezer compartment 5 and the vegetable compartment 6 are integrally housed with the doors 3a, 4a, 5a, 6a provided in front of each chamber. 3b, 4b, 5b, and 6b are provided, respectively, and the storage containers 4b, 5b, and 6b can be taken out by touching the handles (not shown) of the doors 4a, 5a, and 6a and pulling them forward. have. Similarly, in the ice-making chamber 3 shown in FIG. 1, the storage container (indicated by 3b in FIG. 2) which is not shown integrally with the door 3a is provided, and a hand is not shown in the handle part which is not shown in figure 3a. The storage container 3b can be taken out by bringing it forward.

As shown in FIG. 2 (see FIG. 3 as appropriate), the cooler 7 is installed in a cooler storage chamber 8 provided at approximately the rear of the lower freezer compartment 5, and is provided in the interior of the refrigerator above the cooler 7. The air cooled by heat exchange with the cooler 7 by the blower (blower) 9 (cold air, hereinafter referred to as cold air generated by the cooler 7 is referred to as cold air) is a refrigerating chamber blowing duct 11, in which the sign is omitted. The refrigerating compartment (2), the vegetable compartment (6), the upper freezer compartment (4), through the vegetable compartment blowing duct (see FIG. 3), the upper freezer compartment blowing duct 12, the lower freezer compartment blowing duct 13, and the ice compartment blowing duct not shown. The lower freezer 5 is sent to each chamber of the ice making chamber 3. Blowing air into each chamber is controlled by opening and closing the refrigerator compartment damper 20 and the freezer compartment damper 50.

In addition, each blowing duct to the refrigerating chamber 2, the ice making chamber 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 is each room of the refrigerator 1 as shown with the broken line in FIG. It is installed on the back side of.

Specifically, when the refrigerating chamber damper 20 is opened and the freezing chamber damper 50 is closed, the cold air is sent to the refrigerating chamber 2 from a blower outlet 2c formed in multiple stages via the refrigerating chamber blowing duct 11, It is sent to the vegetable compartment 6 from the jet opening 6c via the vegetable compartment ventilation duct (refer FIG. 3) branched from the refrigerator compartment ventilation duct 11 (refer FIG. 3).

In addition, the cold air which cooled the refrigerator compartment 2 is the front of the cooler storage chamber 8 (refer FIG. 5) through the refrigerator compartment return duct 16 from the return port 2d formed in the lower surface of the refrigerator compartment 2, for example. Seen from, for example, returns to the lower right side. In addition, the return air from the vegetable chamber 6 returns to the lower part of the cooler storage chamber 8 via the return port 6d.

In FIG. 3, the freezer compartment damper 50 is omitted. However, when the freezer compartment damper 50 is in the open state, the cold air heat exchanged in the cooler 7 is not shown by the in-vehicle blower 9 or the upper freezer compartment. It is blown through the blower duct 12 from the blower outlets 3c and 4c to the ice making chamber 3 and the upper freezer compartment 4, respectively, and from the blower outlet 5c to the upper freezer compartment 4 through the lower freezer blower duct 13. It is blown.

The cold air which cooled the upper freezer compartment 4, the lower freezer compartment 5, and the ice making chamber 3 returns to the cooler storage chamber 8 through the freezer compartment return port 17 formed below the lower freezer compartment 5. .

In addition, a defrost heater 22 is provided below the cooler 7, and an upper cover 53 is provided above the defrost heater 22 to prevent defrost water from dripping onto the defrost heater 22. have.

In addition, the defrost heater 22 can change an output by duty control by the control board 31 mentioned later.

After the defrost water attached to the wall of the cooler 7 and the surroundings of the cooler storage chamber 8 melts by defrost, the defrost water flows into the cylinder 23 provided in the lower part of the cooler storage chamber 8, It reaches the evaporating dish 21 arrange | positioned in the late machine room 19 through the drain pipe 27, and late evaporates by the heat of the condenser.

In addition, from the front of the cooler 7, the cooler temperature sensor 35 is provided in the upper right side, the refrigerating chamber temperature sensor 33 in the refrigerating chamber 2, and the freezer compartment temperature sensor 34 in the lower freezing chamber 5, respectively. The temperature of the cooler 7 (hereinafter referred to as a cooler temperature), the temperature of the refrigerating chamber 2 (hereinafter referred to as a refrigerator compartment temperature), and the temperature of the lower freezer compartment 5 (hereinafter referred to as a freezer compartment temperature) can be detected. It is supposed to be.

Here, the refrigerator compartment temperature in this embodiment corresponds to the temperature of the refrigerator compartment temperature described in the claim, and the freezer compartment temperature corresponds to the temperature of the refrigerator compartment temperature described in the claims.

Moreover, the refrigerator 1 is equipped with the outside air temperature sensor and outside air humidity sensor which are not shown in which it detects the high temperature and humidity environment (outdoor temperature, outside air humidity).

The vegetable chamber temperature sensor 33A may also be arranged in the vegetable chamber 6.

The machine room 19 is provided in the lower back side of the heat insulation case body 10, the compressor 24 and the condenser which are not shown are accommodated in the machine room 19, and the heat | fever of the condenser is heat-removed by the ultra-high blower which is not shown in figure. do.

In addition, in this embodiment, isobutane is used as a refrigerant | coolant, and refrigerant | coolant sealing amount is made into a small quantity about 80 g.

On the top surface side of the ceiling wall of the refrigerator 1, a control board 31 mounted with a memory such as a CPU, a ROM or a RAM, an interface circuit, and the like is disposed, and the control board 31 includes the above-described outside air temperature sensor, outside air humidity sensor, The door sensor for detecting the opening / closing state of each door of the cooler temperature sensor 35, the refrigerating compartment temperature sensor 33, the freezer compartment temperature sensor 34, and the doors 2a, 2b, 3a, 4a, 5a, and 6a, The compressor 24 is turned on or off by connecting to a temperature setter (not shown) provided on the inner wall of the refrigerating chamber 2, a temperature setter not shown on the inner wall of the lower freezer compartment 5, and the like preloaded in the ROM. Control of each actuator (not shown) for individually driving the refrigerator compartment damper 20 and the freezer compartment damper 50, on / off control or rotational speed control of the in-vehicle blower 9, on / off of the outer blower Control such as off control and rotation speed control, as described above Control such as on / off of an alarm indicating an open state is performed.

Next, the flow of air flowing into the cooler of the refrigerator of the present embodiment will be described with reference to FIGS. 2 and 3 as appropriate with reference to FIGS. 4 and 5.

4 is a partial side view of the cooler peripheral portion, and FIG. 5 is a partial front view of the cooler peripheral portion.

In the state where the refrigerator compartment damper 20 is closed, the freezer compartment damper 50 is opened, and the cooling is performed only for the freezing temperature chambers (the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5). The cold air blown through the ice making chamber blowing duct to the ice making chamber 3 and the cold air blown through the upper freezing chamber blowing duct 12 (see FIG. 2) to the upper freezing chamber 4 are lowered to the lower freezing chamber 5, Inner wall lower part of lower freezer compartment 5, like freezer return air indicated by arrow C in FIG. 4, with cold air blown through lower freezer compartment blow duct 13 (see FIG. 2) to lower freezer compartment 5. The cooler 7 which flows into the cooler accommodating chamber 8 from the lower front of the cooler accommodating chamber 8 via the freezer compartment return port 17 arrange | positioned to it, and is equipped with many fins to the cooler piping 7a, and Heat exchange.

In addition, the width dimension of the freezer compartment return port 17 is the width width substantially equal to the width dimension (cooler width dimension L) of the cooler 7 shown in FIG.

On the other hand, in the state where the refrigerating chamber damper 20 is in an open state and the freezer compartment damper 50 is in a closed state, and cooling only of the refrigerating temperature chambers (the refrigerating chamber 2 and the vegetable chamber 6) is performed, from the refrigerating chamber 2 The return cold air inflows into the cooler storage chamber 8 from the lower side of the cooler storage chamber 8 through the cold storage chamber return duct 16, as in the vegetable chamber return air indicated by the arrow D in FIG. Heat exchange with).

In addition, the cold air which cooled the vegetable compartment 6 flows into the lower part of the cooler storage chamber 8 through the vegetable compartment return port 6d (refer FIG. 2) which is not shown in FIG. 4 and FIG. The flow field (hereinafter referred to as the state of the flow of air in the cooler storage chamber 8), which is less than the amount of air circulating in the large chamber and the air volume circulating in the refrigerating chamber 2, indicates the state of the flow of the cold air in the cooler storage chamber 8. Since the influence of the flow field to be simply referred to as "flow field" is relatively small, the description is omitted here.

When both the refrigerating compartment damper 20 and the freezer compartment damper 50 are open and the refrigerating temperature compartment and the refrigerating temperature compartment are simultaneously cooled, the flow of return air from the refrigerating temperature compartment and the return from the refrigerating temperature compartment Since the flow of cold air influences each other, the flow of cold air in the cooler accommodating chamber 8 becomes a complicated flow field, and the flow C of return cold air from the freezing temperature chamber shown in FIG. The flow D of the return cold air D from the refrigerating chamber 2 shown in FIG.

In the refrigerator of the cold-air forced circulation system which cools not only the structure of the refrigerator 1 of this embodiment but a refrigerated temperature room and a freezer temperature room with the common cooler 7, the cooler storage room of each return cold air ( Since the inflow point to 8), the inflow direction (angle) to the cooler storage chamber 8, the air volume, etc. are different, the cooler storage chamber 8 in which return cold air from a freezer temperature chamber and return cold air from a refrigeration temperature chamber form. In the case of cooling only the refrigerating temperature chamber, when only the refrigerating temperature chamber is being cooled, the flow field in) is generally different between the case where the refrigerating temperature chamber and the refrigerating temperature chamber are simultaneously cooled.

On the other hand, in general, when the temperature-humidity environment in the refrigerator 1 is taken into consideration, since the absolute humidity is generally higher in the refrigerated temperature room having a higher temperature than in a refrigerated temperature room having a low temperature, the source of frost adheres to the cooler 7. The moisture to be obtained is mainly carried from the refrigeration temperature zone room. From this point, in the refrigerator 1 of this embodiment, frost adheres easily in the periphery of the area | region B shown in FIG. In this frosted state, when the compressor 24 (see FIG. 2) is stopped, when the cold air circulation to the freezing temperature chamber is interrupted, the air blower 9 is blown to the refrigerating temperature chamber to perform defrosting. (For example, the technique described in Patent Document 2), the frost easily melts and the efficiency of the defrosting becomes high because the position where frost adheres easily occur and the position where the flow formed when performing defrosting coincide with each other.

However, even if a user does not use the unusual refrigerator 1, the conditions which deviate from the high temperature-humidity environment of the said normal refrigerator may arise.

For example, when a large quantity of normal temperature fish or meat is put into a freezing temperature room and attempted cryopreservation, or a small gap between the doors 3a, 4a, 5a of the freezing temperature room and the thermal insulation case 10. In spite of this, the door sensor cannot detect the open state of the doors 3a, 4a, and 5a, so that a notification by an alarm is not made and the user does not notice the situation. As the latter example, the doors 3a, 4a, 5a in a state where small food wastes are sandwiched between the doors 3a, 4a, 5a of the refrigerating temperature chamber and the front surface of the edge of the opening of the heat insulation case body 10 are held. You can think of a closed case. In this case, since the doors 3a, 4a, and 5a are basically closed, the alarm function does not operate and the user cannot know that there is a gap in the door. The operation of the refrigerator 1 is continued until a gap is formed.

In the state as described above, the moisture serving as a source of frost to the cooler 7 is transported to the cooler storage chamber 8 much from the freezing temperature zone room. Thus, frost adhesion is generated in large quantities in almost the entire width of the lower part of the cooler 7 under the influence of the inflow from the freezer compartment return port 17 having a dimension substantially equal to the cooler width dimension L.

On the other hand, when the compressor 24 is stopped and the cold air circulation to the refrigerating temperature chamber is interrupted, and the defrost is performed by blowing the air into the refrigerating temperature chamber by the in-room blower 9, the area where the defrost is effectively performed is As shown in FIG. 5, the return cold air flows easily from the refrigerating temperature room, as shown in FIG. 5, the frost near the area A shown in FIG. 5 in which the influence of the flow of the return cold air from the refrigerating temperature room is less likely to be affected. Hard to melt

Therefore, since the frost near the area A hardly melts, the defrosting time is prolonged, and the temperature of the freezing temperature chamber which continues to invade heat from the outside during defrosting rises significantly, for example, that the frozen food melts. The possibility was occurring.

Furthermore, despite the fact that frost remains near the area A, depending on the installation location of the cooler temperature sensor provided in the cooler 7, the detection temperature is increased and it is determined that the defrost is terminated, and the cooler 7 Normal operation is resumed with frost remaining, the efficiency of heat exchange in the cooler 7 decreases, and the energy saving performance deteriorates. Furthermore, there exists a possibility that the cooling capacity may be insufficient and the temperature inside the refrigerator 1 cannot be maintained at a predetermined value.

Next, the cause of misjudgement of defrost termination in the prior art will be described below. In the flow of air circulating in the refrigerating temperature chamber, the ventilation resistance in the vicinity of the region B decreases as the frost near the region B in which frost easily melts in FIG. 5 melts. The flow becomes more concentrated. Therefore, with the passage of time, the amount of air flowing through the region with little frost increases, and the amount of heat exchange with frost decreases, so that even if frost remains in the region A, the circulating air temperature may increase. . By the rise of this air temperature, even if the cooler temperature sensor 35 is provided in the upper part of the cooler 7 which is generally easy to leave the frost of the cooler 7 at the time of defrosting, for example, the cooler temperature at the position. Based on this, the control board 31 (refer FIG. 3) may determine that defrost is complete | finished.

This problem is, for example, at the time of the compressor 24 described in Patent Document 2 or Patent Document 3, the defrost heater 22 is closed in a state in which the freezing chamber damper 50 is closed to block the circulation of cold air to the freezing temperature chamber. ), And there was a case in which the air blower 9 was used to blow air into the refrigerating temperature chamber. This is because defrosting effect due to radiation from the defrost heater 22 is reduced because frosting is performed even when the defrost heater 22 is energized, and the frost near the region A in FIG. 5 is hard to melt.

The reason why the defrost effect by radiation from the defrost heater 22 becomes small is as follows. It is known that the amount of heat transfer Qrad due to radiation is proportional to the quadratic difference T14-T24 between the high temperature surface T1 and the low temperature surface temperature T2, as shown in the following equation (1).

[Equation 1]

Qrad∝ (T14-T24)

On the other hand, the temperature Tsurf of the surface of the object in which the calorific value Q is constant is larger as the heat transfer rate h on the surface of the object becomes larger when the air temperature Tair and the heat transfer area SA are the same, as shown in Equation 2 below. Lowers.

&Quot; (2) "

Tsurf = Tair + (Q / (h? SA))

Also, in general, the heat transfer rate h increases as the wind speed flowing through the object surface increases. Therefore, the heat transfer rate h is higher in the state of blowing when compared with the state without blowing. As described above, even when the amount of heat generated by the defrost heater 22 is the same, the temperature of the surface of the defrost heater 22 is lowered from the equation (2) in the case of making the air blown as compared with the case where the air is not blown. When the surface temperature of the defrost heater 22 decreases, when the low-temperature surface temperature (here, frost surface temperature) is the same from Equation 1, the amount of heat transfer by radiation decreases, so that the defrost effect by radiation decreases.

In the refrigerator of this embodiment, since the upper cover 53 is further present between the defrost heater 22 and the cooler 7, the defrost effect by radiation becomes smaller.

For the above reason, for example, when the compressor 24 described in Patent Literature 2 or Patent Literature 3 is stopped, the defrost heater 22 is energized while the cold air circulation to the refrigeration temperature chamber is shut off, and In the case of adopting a method of blowing air to the refrigerating temperature chamber by the blower 9, the area A in FIG. 5 is not sufficiently defrosted by radiation, and as described above in the problem to be solved by the invention. In some cases, the airflow circulating in the refrigerating temperature chamber may not be sufficiently defrosted, and the energy saving performance deteriorates. Furthermore, there exists a possibility that the problem of not being able to maintain a high internal temperature at a predetermined value due to lack of cooling capability.

Next, the defrosting method of the refrigerator 1 of this embodiment is demonstrated, referring FIGS. 6-10.

Fig. 6 is a view for explaining a defrost mode, and Figs. 7 to 11 are flowcharts showing the flow of control of defrost, and Fig. 11 is a view showing operating states of a defrost heater, an internal blower, a refrigerator compartment damper, a freezer compartment damper, and a compressor in defrost. It is a figure explaining the time chart and the change of a refrigerator compartment temperature, a freezer compartment temperature, and a cooler temperature.

In addition, in the following description, "compressor ON" is a state in which the compressor 24 is operating, "compressor OFF" is a state in which the compressor 24 is stopped, and the state in which the air blower 9 is operating is "internally stored." Blower ON ", the state in which the in-vehicle blower 9 is stopped," in-air blower OFF "and the state which energized the defrost heater 22, the state which has not energized the defrost heater ON and the defrost heater 22 "Defrost heater OFF", the refrigerator compartment damper 20 is in an open state, and the refrigerator compartment damper 20 is closed, and the refrigerator compartment damper 20 is closed, and the blower to the refrigerator compartment is blocked. The freezer damper 50 is closed, the freezer damper 50 is open, and the freezer damper 50 is closed, and the freezer damper 50 is closed. `` Freezing room '' Abbreviated as buffer closed. "

In addition, as a mode of the normal cooling operation of the refrigerator 1, a plurality of cooling operation modes are prepared, and the state of "compressor ON, internal blower ON, refrigerating chamber damper open, freezing chamber damper closed, defrost heater OFF" is set as "refrigerator cooling operation." Mode, `` compressor ON, blower blower ON, cold room damper closed, freezer damper open, defrost heater OFF '' mode, `` freezer cooling operation '' mode, `` compressor ON, blower blower ON, freezer damper open, freezer damper open, defrost The state of "heater OFF" is called "refrigerating chamber and freezer simultaneous cooling operation" mode.

Here, the normal cooling operation is based on the temperature detected by the refrigerating chamber temperature sensor, the freezing chamber temperature sensor, and the outside air temperature sensor, and the control of the compressor 24, the internal blower 9, and the external blower (ON / OFF control and rotational speed). Control), and control of the open / closed state of the refrigerator compartment damper 20 and the freezer compartment damper 50, each chamber is a predetermined temperature (for example, about 3 ℃ in the refrigerator compartment, about 5 ℃ in the vegetable compartment, -18 ℃ in the freezer compartment) Degree) to keep driving.

In addition, in description of the following defrosting method, the vegetable compartment 6 is handled as a part of the refrigerating compartment 2, and the description about the vegetable compartment 6 is abbreviate | omitted.

As shown in FIG. 6, the refrigerator 1 of this embodiment is equipped with the mode of defrost mode 1-6 as a mode in defrosting operation. Among these defrost modes, as shown below in the table of FIG. 6, the defrost mode 1 which performs "the defrost by the in-air blower" of "The compressor OFF, the internal blower blower ON, the refrigerator compartment damper open, the freezer compartment damper closed, the defrost heater OFF" claims Defrost mode 3 corresponding to "first defrost means" described in "Depressor by internal blower + defrost heater" of "compressor OFF, air blower ON, refrigerating chamber damper open, freezer damper closed, defrost heater ON" claims Defrost mode 6 which performs "defrost by defrost heater" of "compressor OFF, high blower blower OFF, refrigerator compartment damper closed, freezer chamber damper closed, defrost heater ON" corresponding to "2nd defrost means" described in Third defrosting means ”.

And defrost mode 2 is a mode which performs defrosting operation by defrost mode 3 (second defrosting means) after defrosting operation by defrosting mode 1 (first defrosting means), and defrosting mode 4 is defrosting mode 1 (defrosting). Defrost mode 3 (second defrost means) and defrost mode 6 (third defrost means) continue to perform defrost operation after defrost operation by 1 defrost means, and defrost mode 5 is defrost mode 3 (second It is a mode which performs defrosting operation by defrost mode 6 (third defrosting means) after defrosting operation by defrosting means).

Thus, the mode of defrosting operation in the refrigerator 1 of this embodiment is set as the defrost mode combining all or one part of 1st-3rd defrosting means.

Defrost mode 4 in this embodiment corresponds to the 1st defrost mode of a claim, and defrost modes 4 and 5 correspond to the 2nd defrost mode of a claim.

As shown in the "pre-defrost condition" column of the table of FIG. 6, the conditions with respect to the temperature of the cooling operation mode, the freezer compartment temperature, and the refrigerating chamber temperature of the refrigerator 1 before the defrosting operation start applied with respect to defrost mode 4-6 are different. . In addition, in the "defrost" column of the table of FIG. 6, the combination of the defrosting means 1-3 is described so that each defrost mode is easy to understand. In addition, as shown in the "defrost completion determination conditions" column of the table of FIG. 6, whether the defrost modes 1-6 are complete | defrosted with the conditions of the defrost completion determination temperature of what freezer compartment temperature, a refrigerator compartment temperature, or a cooler temperature is completed? It appears, for example, even if it determines with freezer temperature, the temperature value applied in each mode differs.

Here, the conditions of the cooler temperature shown in the "defrost completion determination conditions" column of the table of FIG. 6 correspond to the defrost completion determination temperature of Claim.

The details of the defrosting condition and the defrosting completion determination condition will be described in the description of the flowchart to be described later.

<< flow of control of defrosting operation >>

Next, the flow of control of the defrosting operation will be described with reference to FIGS. 7 to 11. This control is performed by the CPU of the control board 31 (see Fig. 2) executing a program stored in the ROM.

As shown in Fig. 7, the refrigerator starts operation by turning on the power (start), and the initial conditions are FLAGi = 0, FLAGj = 0, and FLAGk = 0 (step S100).

Here, FLAGi is a flag indicating that defrost mode 4 has been selected as described later. The freezer temperature is excessively increased during the defrost operation in defrost mode 4, the defrost operation is stopped, and the freezer cooling operation is temporarily performed. It is also a flag indicating the transition to the defrost mode. Moreover, FLAGj is a flag which shows the conditions which give priority to cooler defrost as mentioned later, and is also a flag for switching of the defrost mode in the defrost operation. FLAGk is a flag indicating whether defrost without the third defrost means is performed as described later.

Then, normal cooling operation is performed (step S101). In Step S102, the mode of the normal cooling operation is "freezer compartment cooling operation", and it is checked whether the freezer compartment temperature is lower than -21 ° C. In the "freezer compartment cooling operation" mode and the freezer compartment temperature is lower than -21 ° C (YES), the flow advances to step S103. Otherwise (NO), the flow returns to step S101 to continue the normal cooling operation.

Since the normal cooling operation has three types of cooling operation modes as described above, when continuing the normal cooling operation, in addition to continuing the "freezing compartment cooling operation" mode, the "freezing compartment cooling operation" is performed based on the refrigerator compartment temperature and the freezer compartment temperature. Mode may be switched to two other types of cooling operation modes ("refrigeration room cooling operation mode" and "refrigeration room and freezer simultaneous cooling operation" mode). For example, when the user puts food having a relatively high temperature into the refrigerator compartment 2, the user switches from the "freezer compartment operation" mode to the "refrigerator compartment operation" mode, rapidly cools the refrigerator compartment 2 to a predetermined temperature, and then again. Shift to the "freezer cooling operation" mode.

In step S102, when the freezer compartment temperature is lower than −21 ° C., it is determined whether or not the condition for continuously performing reliability ensuring defrost is satisfied (step S103). Here, the reliability ensured defrost is a defrost for the purpose of completely removing the cooler 7 and its surrounding frost. Specifically, the cooler temperature is higher than 0 ° C. at which the frost melts, for example, 8 ° C. Defrost is performed until it exceeds. In the present embodiment, whether or not the condition for performing the reliability defrosting is FLAGk = 1 or the integration operation time of the compressor 24 and the operation of the compressor 24 after the completion of the last reliability defrost defrosting operation. It is determined based on the rotational speed and the high temperature and humidity environment (outside air temperature, outside air humidity (relative humidity)). This condition is stored in the ROM in the form of table data in the form of parameters such as the outside temperature, the outside chamber, the integration operation time, and the operating rotation speed, and is determined by referring to this data table. For example, as long as it is conditions of 30 degreeC of air | atmosphere temperature, and 70% of a relative humidity, the conditions which perform reliability ensuring defrost at the frequency of nearly once a day are satisfied.

In step S103, if the condition for performing reliable ensuring defrost is satisfied (YES), the flow proceeds to step S201, and if the condition for performing reliable ensure defrost is not satisfied (NO), is it a condition that preferentially gives priority to cooler defrost? It is judged whether or not (step S104). Here, the condition of giving priority to the cooler defrost is a condition that requires a defrost to give priority to removing frost attached to the cooler even if the temperature fluctuations in the refrigerator become slightly larger. This condition is, for example, the case where the outside air temperature is higher than 35 ° C and the outside air humidity is higher than 85%.

In step S104, when the condition which gives priority to cooler defrost is satisfied (Yes), it progresses to step S501, and when the condition which gives priority to cooler defrost is not satisfied (No), defrost mode 1 is automatically selected (No). Step S105).

Here, satisfying the condition of giving priority to the cooler defrost means that the cooler defrost is given priority when the temperature detected by the outside temperature sensor is higher than 35 ° C and the humidity (relative humidity) detected by the outside humidity sensor is higher than 85%. It is determined that the condition is satisfied.

(Defrost mode 1)

Subsequently, defrosting operation is performed by the first defrosting means (&quot; compressor OFF, air blower ON, refrigerating chamber damper open, freezing chamber damper closed, defrost heater OFF &quot;) (step S106). The defrosting operation state of step S106 is higher than the freezer compartment temperature -17 degreeC in step S107, higher than the refrigerating chamber temperature 5 degreeC in step S108, lower than the refrigerating compartment temperature 0 degreeC in step S109, or in step S110. The defrosting operation according to the defrost mode 1 is continued when the defrosting completion determination condition of any one of the cooler temperatures higher than 0.5 ° C is satisfied, and if the defrosting completion determination condition of any one of steps S107 to S110 is satisfied (example). It ends (step S111) and stores it as FLAGk = 1 (step S112). Thereafter, the normal cooling operation (step S101) is resumed. When each defrosting completion determination condition of step S107 thru | or step S109 is not satisfied (No), it progresses to the check of each defrost completion condition of next step S108 thru | or step S110.

Here, -17 degreeC which is the freezer compartment temperature in step S107 corresponds to the freezer temperature zone upper limit temperature of Claim.

Here, each defrost completion determination condition is demonstrated concretely. The defrosting completion judgment condition (freezer temperature> -17 ° C.) of step S107 indicates that the door 3a of the freezing temperature room room is freed by the user when the freezer temperature has risen due to heat invasion from the outside, or during the defrosting operation by the defrost mode 1 in full swing. , 4a, 5a) is satisfied when the freezer compartment temperature rises due to factors such as opening and closing.

The defrosting completion determination condition (refrigerating chamber temperature> 5 ° C) of step S108 is basically that the refrigerating chamber 2 is cooled by the cold heat of frost, so that the temperature rise is hard to occur and is rarely satisfied. 2) It may be satisfied when food with high temperature is put in. If the frost remains (the cooler temperature is low temperature), the refrigerating chamber is cooled even though it takes time. If the defrosting completion determination condition (refrigerating chamber temperature> 5 ° C) of step S108 is satisfied, the fresh food is cooled. There may be a case of slowing down. Therefore, the defrosting completion determination condition of step S108 is a step provided in order to cool the newly added food quickly.

The defrosting completion judgment condition (refrigerator temperature <0 ° C) of step S109 is that the cooler temperature at the time of "compressor OFF" is very low temperature, low temperature, and relatively high amount of frost is attached to the cooler 7 and its surroundings. When the temperature fall of the refrigerating compartment 2 is remarkable due to the influence of frost (influence of sensible heat of frost), it is rarely satisfied, and is provided for preventing freezing of food in the refrigerating compartment 2.

The defrosting completion determination condition (cooler temperature> 0.5 degreeC) of step S110 is satisfied when the frost of the cooler 7 melt | dissolves almost completely, and the temperature of the cooler 7 starts to rise.

When the amount of frost deposition is relatively large, the freezing chamber temperature tends to rise before frost melts, and the defrost mode 1 is often terminated because the defrosting completion determination condition of step S107 is satisfied. On the other hand, when the amount of frost deposition is relatively small, the defrosting completion determination condition of step S110 is satisfied, so the probability of the defrosting mode 1 being finished increases.

In addition, after completion of the defrosting operation (step S111), FLAGk = 1 is recorded in step S112.

(Effect of Defrost Mode 1)

Next, the effect of the defrost mode 1 will be described. Since the defrost mode 1 is a defrost using only defrosting operation by the first defrosting means (defrost by the air blower), the energy input from the outside for defrosting is the power of the air blower 9 (a power consumption of about 1 to 2 W). It is a defrosting system with very high energy-saving performance, in that the refrigerating compartment 2 is cooled by using the cold heat of frost, that is, the frost is melted by using the heat load in the furnace. In addition, in order to improve the energy saving performance, it is effective to melt as much frost as possible when the defrost mode 1 is performed, and the defrosting completion judgment in which the cooler temperature of which the frost of the cooler 7 is almost melted is higher than 0.5 ° C. It is preferable to defrost until a condition is satisfied.

On the other hand, since the refrigerator 1 has a basic function of keeping food in a predetermined temperature range, its basic function should not be impaired. Therefore, in order to obtain the energy saving effect by the defrost mode 1, step S107 to step S109 are provided in the range which the basic function of the refrigerator of maintaining a predetermined temperature range is not impaired.

These steps provide a refrigerator capable of achieving both reliability (predetermined temperature range) and energy saving performance that can achieve maximum energy saving performance within a range in which the basic function of maintaining a predetermined temperature range is not impaired.

In addition, when the amount of frost deposition is relatively small, the probability of completing defrost mode 1 is increased by satisfying the defrosting completion determination condition of step S110. When the amount of frost deposition is relatively small, the compressor ( Since the amount of heat required to heat the liquid refrigerant in the refrigerant pipe of the cooler 7 at the time of stoppage 24 becomes relatively large, the case of terminating the defrost mode 1 by satisfying the defrost completion determination condition of step S110 is increased. . In other words, in order to increase the energy saving effect, it is also effective to reduce the amount of the liquid refrigerant present in the cooler pipe 7a of the cooler 7 at the time of "compressor OFF". In this embodiment, since the refrigerant filling amount is about 80 g (the refrigerant is isobutane), the amount of the liquid refrigerant present in the cooler pipe 7a of the cooler 7 when the compressor 24 is stopped. In many cases, the defrost mode 1 satisfies the defrosting completion determination condition of step S110 and ends, resulting in a refrigerator having excellent energy saving performance.

〈Defrost mode 4; reliability ensure defrosting〉

Next, the case where the conditions for performing reliability ensuring defrost are satisfied (step) in step S103 will be described.

In step S103 of FIG. 7, when the condition for performing reliability ensuring defrost is satisfied (YES), the procedure proceeds to step S201 of FIG. 8 according to reference numeral (1), and stores FLAGi = 1.

Next, defrost mode 4 is selected (step S202), and it is checked whether the "freezer compartment cooling operation" which is a condition of the defrosting operation start by defrost mode 4 is higher than 5 degreeC (step S203). "Freezer cooling operation" Further, when the refrigerator compartment temperature is higher than 5 ° C. (Yes), the process proceeds to Step S204. Otherwise, Step S203 is repeated.

As shown in FIG. 6, since the defrost mode 4 is started when the refrigerator compartment temperature becomes higher than 5 degreeC in the mode of "freezer compartment cooling operation", since the "freezer compartment cooling operation" is performed at the time of step S103, Even if the defrost mode 4 is selected in step S202, the mode of the normal cooling operation of "freezer compartment cooling operation" is continued until the refrigerator compartment temperature becomes higher than 5 degreeC.

When the process proceeds from step S203 to step S204, the defrosting operation by the first defrosting means, which is the defrosting operation of the first stage of the defrosting mode 4 (`` compressor OFF, blower blower ON, refrigerator compartment damper open, freezer compartment damper closed, defrost heater OFF '') Is done. Subsequently, it is checked whether FLAGi = 2 in step S205. If FLAGi = 2 (Yes), the flow proceeds to step S208. If FLAGi ≠ 2 (No), the flow proceeds to step S206. In this case, since FLAGi = 1 is stored in step S201, FLAGi = 2 is not satisfied, and the flow proceeds to step S206.

In step S206, it is checked whether a freezer compartment temperature is higher than -10 degreeC. If the freezer compartment temperature is higher than -10 ° C (YES), the flow proceeds to Step S301. Otherwise, the flow proceeds to Step S207. In step S207, it is checked whether the temperature difference (refrigerator temperature-cooler temperature) between the refrigerator compartment temperature and the cooler temperature is lower than 2 ° C. If the temperature difference is lower than 2 ° C (example), the flow proceeds to step S208. Returning to step S206, the checks of steps S206 and 207 are repeated while the defrosting operation by the first defrosting means is continued.

Here, -10 ° C, which is the freezer compartment temperature in step S206, corresponds to the freezer compartment temperature zone upper limit temperature described in the claims.

In step S208, the defrost heater 22 is turned ON and its output is 80 W ((defrost heater ON 80W).) By turning on the defrost heater 22 in Step S208, it is determined by the second defrost means. The defrosting operation state (defrost by the high blower + defrost heater: "compressor OFF, high blower ON, refrigerating chamber damper open, freezer damper closed, defrost heater ON").

In step S209, it is checked whether the freezer compartment temperature is higher than -10 ° C. When the freezer compartment temperature is higher than -10 占 폚 (YES), the process proceeds to step S301 in FIG. 9 according to the code (4), and when the freezer compartment temperature is -10 占 폚 or less (NO), the process proceeds to step S210.

In step S210, it is checked whether the refrigerator compartment temperature is lower than the cooler temperature, and if the refrigerator compartment temperature is lower than the cooler temperature (example), the process proceeds to step S211, and if the refrigerator compartment temperature is equal to or higher than the cooler temperature (no), the process returns to step S209. The defrosting operation by the second defrosting means is continued, and the checks in steps S209 and S210 are repeated.

Here, -10 ° C, which is the freezer compartment temperature in step S209, corresponds to the freezer compartment temperature zone upper limit temperature described in the claims, and the refrigerator compartment temperature in step S210 is lower than the cooler temperature (refrigerator temperature <cooler temperature) described in the claim " Corresponds to a predetermined first cooler temperature of 0 ° C or higher.

In step S210, when the refrigerating chamber temperature is lower than the cooler temperature (for example) and proceeds to step S211, the blower in the refrigerator is turned off and the refrigerating chamber damper is closed, and the defrost heater output is changed from 80W to 160W. Thereby, it will be in the state of defrosting operation by a 3rd defrosting means. 9, it is checked in step S212 whether a freezer compartment temperature is higher than -10 degreeC. If the freezer compartment temperature is higher than -10 ° C (Yes), the flow proceeds to step S301. If the freezer compartment temperature is -10 ° C or less (No), the flow advances to step S213 to check whether the cooler temperature is higher than 8 ° C. If the cooler temperature is higher than 8 ° C. (Yes), the flow proceeds to step S214. If the cooler temperature is 8 ° C. or less (No), the flow returns to step S212 again and the defrosting operation by the third defrosting means is continued. Repeat the check.

Here, -10 ° C, which is the freezer compartment temperature in step S212, corresponds to the freezer compartment temperature zone upper limit temperature described in the claims, and the cooler temperature in step S213 is higher than 8 ° C (cooler temperature> 8 ° C) according to the claim " When the temperature rises to a predetermined second cooler temperature ”.

In step S213, if it is YES and progresses to step S214, the defrosting operation by the defrost mode 4 is complete | finished and the defrost heater 22 is turned off (defrost heater OFF). Thereby, it will be in the state of "compressor OFF, air blower OFF, refrigerator compartment damper closed, freezer chamber damper closed, defrost heater OFF." In step S215, it is checked whether 5 minutes have elapsed after the defrost heater 22 is turned off (5 minutes have elapsed since the defrost heater 22 is turned off?), And if it has not passed (no), step S215 is performed. When 5 minutes have passed (Yes), the compressor 24 is turned on (step S216, compressor ON). Thereby, it turns into the state of "compressor ON, air blower OFF, refrigerator compartment damper closed, freezer chamber damper closed, defrost heater OFF."

In step S217, it is checked whether 2 minutes passed after the compressor 24 was turned on. If it has not elapsed (No), step S217 is repeated, and if 2 minutes have elapsed (Yes), the process returns to step S101 (see FIG. 7) and returns to normal cooling operation again (after 2 minutes of compressor ON?)

(Effect of Defrost Mode 4)

The flow of steps S201 to S217 described above is a description of the case where the condition for performing reliability ensuring defrost is satisfied and defrosting operation in the defrost mode 4 is performed.

The effects will be described below with reference to the flowcharts of FIGS. 8 and 9 and the time chart in the defrosting operation by the defrost mode 4 of FIG. 11. 11, the section of the "freezing chamber cooling operation" after the defrost mode 4 is selected, the section TA of the defrosting operation by the "first defrosting means", and the section TB of the defrosting operation by the "second defrosting means". Is divided into a section TC of the defrosting operation by the "third defrosting means", a section (TD, TE) after the completion of the defrosting operation, a section of the "normal cooling operation", and the refrigerating chamber temperature, the freezing chamber temperature, and Change of cooler temperature, ON state (160W) / ON state (80W) / OFF state of the defrost heater 22, ON / OFF state of the blower 9 inside, open state / closed state of the refrigerator damper 20, inside The ON / OFF state of the blower 9, the open state / closed state of the freezer compartment damper 50, and the ON state / OFF state of the compressor 24 are shown.

As shown in Fig. 11, when the defrost mode 4 is selected, the freezer compartment cooling operation is performed until the freezer compartment temperature exceeds 5 deg. C before entering the defrost operation in the defrost mode 4 (step S203), and the refrigerating compartment temperature is 5 deg. If exceeding, defrosting operation by a 1st defrosting means ("compressor OFF, in-air blower ON, refrigerating chamber damper opening, freezing chamber damper closing, defrost heater OFF") is performed (step S204-step S207).

This is because when the frost is melted by blowing into the refrigerating chamber 2 by the air blower 9 in the refrigerator, the temperature of the refrigerating chamber 2 is as high as possible, because it is easier to heat exchange with the frost attached to the cooler 7 in advance. The temperature of the refrigerating chamber 2 is made high, thereby increasing the energy saving effect. In addition, since the freezer compartment cooling operation is performed while the refrigerating compartment 2 is waiting for the temperature to rise due to heat intrusion from the outside, the freezer compartment that is likely to rise in temperature due to heat intrusion from the outside during defrosting is sufficiently cooled before defrosting. It can also reduce the possibility of the problem that the frozen food melts during defrosting.

When the defrosting operation by the first defrosting means is performed as the first step in the defrosting mode 4, as shown in the section TA in FIG. 11, the refrigerating chamber temperature is cooled by the cold heat of frost, while the cooler temperature ( Frost temperature) rises due to the heat load of the refrigerating chamber, and the difference with the cooler temperature gradually decreases. When the temperature difference between the refrigerating chamber temperature and the cooler temperature becomes small, heat exchange becomes difficult. Therefore, when the defrosting operation by the first defrosting means is continued as it is, the defrosting time becomes long. On the other hand, as shown in FIG. 11, the freezer compartment temperature during defrost continues to rise.

Therefore, if the defrosting time is long, there is a possibility that the problem of melting frozen food may occur, which is not preferable, and when it is judged that the temperature difference between the refrigerating chamber temperature and the cooler temperature is small [(refrigeration chamber temperature-cooler temperature) <2 ° C is satisfied. (Step S207), the defrost heater 22 is turned ON so as not to lengthen the defrost time (step S208), so that the return air from the refrigerating chamber 2 is easily heated and defrosted. Defrosting operation by the second defrosting means in the section TB in FIG. 11 indicates the state of the "compressor OFF, the blower blower ON, the refrigerator damper open, the freezer damper closed, and the defrost heater ON". "Defrost by" "is being performed (step S208-step S210). When the output of the defrost heater 22 in a 2nd defrost means is 80W, and this output is a state in which frost remains in the cooler 7, the air after passing through the cooler 7 can cool the refrigerating chamber 2 It is an output which becomes a temperature of about 0-4 degreeC.

In addition, the rotational speed of the internal blower 9 during normal cooling operation is about 1600 rpm, and the defrosting operation by the second defrosting means in the section TB is about 1400 rpm. Thus, changing the rotational speed of the in-flight blower 9 at the time of the defrosting operation by the 2nd defrosting means from that at the time of normal cooling operation is that the air temperature of about 0-4 degreeC which can cool the refrigerating compartment 2 is To adjust to obtain.

Thus, since the defrosting operation by the 2nd defrosting means of the refrigerator 1 of this embodiment is adjusted so that the air temperature of about 0-4 degreeC which can cool the refrigerating compartment 2 is adjusted, Patent Document 2 and Patent Document The cooling heat of the available frost cannot be reused for cooling the refrigerating chamber when the compressor is turned OFF, the blower blower in the refrigerator, the refrigerator damper open, the freezer damper closed, and the defrost heater ON for the purpose of humidification disclosed in 3. Therefore, the energy saving performance is reduced by that much ”, and the energy saving performance can be improved.

If the output of the defrost heater 22 in the defrosting operation of the "defrost by the air blower + defrost heater" is excessive, it becomes the air temperature after passing the cooler higher than the temperature which should be maintained in the refrigerating chamber 2, It is not preferable because it warms (2). In addition, since the defrosting operation by the second defrosting means is intended to suppress the rise of the freezer compartment temperature by shortening the defrosting time, this object is not achieved if the output of the defrosting heater 22 is too small. Thus, the output of the defrost heater 22 in the second defrost means must be appropriate. As an effect of the second defrosting means, the defrost heater 22 is turned on together with the control of the increase in the freezer compartment temperature. However, the frost is being melted while the refrigerating compartment 2 is cooled (the frost is removed using the heat load of the refrigerating compartment 2). Melting], the energy saving effect from the outside for defrosting is reduced by the amount using the heat load of the refrigerating chamber 2, thereby achieving an energy saving effect. In addition, since the return air (the refrigerating chamber return air shown by the arrow D in FIG. 5) from the refrigerator is forced to the cooler 7 by blowing, the heat transfer efficiency between the air and frost is good. There is also an energy saving effect due to the ease of melting.

In this way, by combining the defrosting operation by the second defrosting means after the defrosting operation by the first defrosting means, it is possible to obtain an energy saving effect during the defrosting operation while shortening the defrosting time.

Subsequently, at the time when the refrigerating chamber temperature becomes lower than the cooler temperature (step S210), the air blower OFF and the refrigerating chamber damper are closed, and the output of the defrost heater 22 changes from 80W to 160W (step S211). In the section TC, defrosting operation by the third defrosting means and "defrosting by the defrosting heater" are performed (steps S211 to S213). When the refrigerator compartment temperature becomes lower than the chiller temperature, the cooling heat furnace which the refrigerator 7 has does not have the ability to cool the refrigerator compartment 2, and if it continues to blow more, it will warm the refrigerator compartment 2, and stops blowing, " Defrosting by a defrost heater "prevents the refrigerating chamber 2 from being warm and prevents frost from remaining in the cooler 7.

Since defrost mode 4 is intended to ensure reliability defrost, frost should not be left. As described above, only the defrosting operation by the first defrosting means or the second defrosting means in the "internal blower ON" state causes frost to melt. In some cases, hard spots were created and frost remained. Therefore, when performing reliability ensuring defrost, after defrosting in the "internal blower ON state" of a 1st defrost means and a 2nd defrost means, as shown to the section TC of FIG. 11, "defrost by a defrost heater". To ensure that no frost is left.

In the present embodiment, in the defrosting operation by the third defrosting means, the output of the defrosting heater 22 is increased from 80W to 160W. Thereby, the section TC of defrosting operation by a 3rd defrosting means can be shortened, and the raise of the refrigerator compartment temperature and freezer compartment temperature during that time can be suppressed small.

The defrosting operation by the third defrosting means is a defrosting means having low heat transfer efficiency due to natural convection of air and frost in the cooler storage chamber 8 as compared with the defrosting in the blowing state. However, in this embodiment, since the defrosting operation by a 3rd defrosting means is performed from the state that almost all frost melted that the cooler temperature is higher than the refrigerator compartment temperature maintained at plus temperature, the defrosting means 3 is carried out. The effect of the reduction in energy saving performance due to the defrosting operation is relatively small.

As described above, in the defrost mode 4, by combining the defrosting operation by the first to third defrosting means, it is possible to perform a reliable defrost having a flexible and energy-saving effect, to shorten the defrosting time and to raise the freezer temperature in the meantime. I suppress it.

Next, when the cooler temperature exceeds 8 ° C. (step S213), the defrost heater 22 is turned off and the defrosting operation in the defrost mode 4 is finished (step S214), as shown in the section TD in FIG. 11. Similarly, the apparatus waits for 5 minutes in the state of "compressor OFF, air blower OFF, refrigerator compartment damper closed, freezer damper closed, defrost heater OFF" (step S215). By this time interval TD, the dripping time from the cooler 7 and the upper cover 53 (see FIG. 5) of the defrost water is secured to the cylinder 23 (see FIG. 5), and is normally cooled during the dripping. Operation resumes and freezes again, making it difficult to occupy a part of the cooler storage chamber 8.

Further, in step S213, the defrosting completion determination of another defrosting mode not including defrosting operation by the third defrosting means shown in FIG. 6 so as to end the defrosting operation by the third defrosting means when the cooler temperature exceeds 8 ° C. Since the temperature is set higher than the temperature (cooler temperature> 0.5 ° C), almost complete defrosting can be performed.

After 5 minutes of the elapsed section TD has elapsed, as shown in the elapsed section TE of FIG. 11, only the compressor 24 is first turned on (&quot; compressor ON, blower blower OFF, defrost heater OFF, refrigerating chamber damper closed. Freezer compartment damper closed ") (step S216), and waits for 2 minutes (step S217), and normal cooling operation is resumed after that. This two-minute waiting time is a problem that the cooler 7 and the surrounding air that are getting hot at the time when the defrosting operation in the defrosting mode 4 is finished are sent directly to each chamber in the refrigerator to warm each chamber in the refrigerator. In order to make it hard to produce, it is set normally to cool the inside of the cooler storage chamber 8 before resuming cooling operation.

In the above, the operation | movement when the conditions which perform reliability ensuring defrost is satisfied and defrost by the defrost mode 4 was performed was demonstrated, In defrost mode 4, defrosting operation by a 1st defrost means and defrost by a 2nd defrost means are described. In each step of the operation and the defrosting operation by the third defrosting means, a step for checking the freezer temperature is provided (step S206, step S209 and step S212), and it is determined that the rise of the freezer temperature is remarkable in these steps (freezer compartment). When the temperature is higher than -10 ° C), the process proceeds from the defrost mode 4 to the defrost in the defrost mode 5.

(Transition from defrost mode 4 to defrost mode 5)

Returning to the flowchart of FIG. 9 again, in the middle of the defrosting operation by the defrosting mode 4, in step S206, step S209, or step S212, a freezer compartment temperature becomes higher than -10 degreeC, and it progresses to step S301, and defrosting from the defrosting mode 4 is carried out. A case of shifting to defrost in mode 5 will be described.

In step S301, it is checked whether the cooler temperature is higher than 5 ° C, and if the cooler temperature is higher than 5 ° C (YES), the flow proceeds to step S302, and if not (NO), the flow goes to step S305.

In step S302, it is set as the state of "inner air blower OFF, a refrigerator compartment damper closed, a freezer compartment damper closed, a defrost heater OFF", and also sets it to "compressor ON" (step S303). In step S304, it is checked whether 2 minutes have elapsed since the compressor is turned on. If 2 minutes have elapsed (YES), the flow proceeds to step S305, and if no (SNO) has elapsed, step S304 is repeated. In step S305, it is checked whether FLAGi = 1. If FLAGi = 1 (YES), the flow proceeds to step S306, and if not (NO), the flow proceeds to step S401.

Here, since it is stored as FLAGi = 1 in step S201, it is "Yes" and defrost mode 5 is selected (step S306).

In addition, when the cooler temperature is higher than 5 ° C in step S301, only the compressor is turned on in step S303 and waits for 2 minutes thereafter, by cooling the inside of the cooler storage chamber 8 before the cooling operation is started. This is to make it difficult to cause a problem that the air having a high temperature in the storage chamber 8 is directly sent to each chamber in the chamber to warm each chamber in the chamber.

Defrosting operation by the defrosting mode 5 is set so that it may start when the freezer compartment temperature becomes lower than -25 degreeC during freezer compartment cooling operation as shown in FIG. 6, and a freezer compartment cooling operation is started once so that the condition may be satisfied (step S307). In step S308, it is checked whether the freezer compartment temperature is lower than -25 ° C, and the freezer compartment cooling operation returns to step S307 when the freezer compartment temperature is not lower than -25 ° C (No), and the freezer compartment temperature is lower than -25 ° C. It continues until it becomes low (step S308). If the freezer compartment temperature is lower than -25 ° C in step S308 (YES), the flow advances to step S309 to store FLAGi = 2, and the flow advances to step S207 (see FIG. 8), and the defrosting operation by the first defrosting means is performed. The defrost by the blower ”is performed, and then it is checked whether FLAGi = 2 (step S205).

In this case, since FLAGi = 2 is stored in step S309, the flow proceeds to step S208, where the defrosting operation by the first defrosting means is not performed, and the defrosting operation by the second defrosting means is performed by the "internal blower + defrosting heater". Defrosting ”. Subsequently, in step S209 or step S212, the flow returns to the normal cooling operation through the steps described above, except that the freezer compartment temperature is higher than -10 ° C (Yes).

(Effect of Defrost Mode 5)

During the defrosting operation of the defrost mode 4, as a cause of the remarkable increase in the freezer temperature in either step S206 or step S209 or step S212, the user sometimes causes the ice making chamber 3, the upper freezing chamber 4 or the lower freezing chamber ( 5) It may be considered that food is stored at a relatively high temperature by opening and closing, but there is also a large amount of frost, which takes too much time for defrosting, or collects a lot of moisture returning from the lower freezer compartment (5). In the defrosting operation in the state in which the blower 9 in operation is operated in the state which has been carried in (8), many frosts exist in the place which is hard to defrost, and the defrost time is extended by the influence of the frost, and freezer temperature It is also considered that the case becomes higher than -10 占 폚.

In any case, there is a possibility that the frozen food stored in the upper freezer compartment 4 or the lower freezer compartment 5 may melt, so that the step for recooling the upper freezer compartment 4 or the lower freezer compartment 5 once the temperature has risen may occur. S307 is provided to cool the upper freezer compartment 4 or the lower freezer compartment 5 to a low temperature. Thereby, the possibility of causing troubles, such as melting of the frozen food stored in the upper freezer compartment 4 or the lower freezer compartment 5, can be eliminated, while performing a reliable defrost in full swing. In addition, in the process of defrost mode 4, the cause of the increase in the freezer compartment temperature is remarkably large, and when the defrost time is too long, it is preferable to shorten the defrost time.

Therefore, defrost mode 5 does not go through defrosting operation by the 1st defrosting means in the defrosting mode 4, step S204 in which "defrost by the internal blower is performed", but defrosting operation by the 2nd defrosting means, "indoor "Defrost by blower + defrost heater" is started (step S208). Since the effect of turning ON the defrost heater 22 is added compared with the 1st defrosting means, the 2nd defrosting means can defrost in the short time if it is the same amount of frost. As a result, the defrosting time can be shortened by the defrosting mode 5, and as the defrosting time becomes longer, a problem caused by an increase in the temperature of the ice making chamber 3, the upper freezing chamber 4 or the lower freezing chamber 5 becomes less likely to occur. Highly reliable defrosting operation.

In addition, since the energy saving effect by performing the defrosting operation by a 2nd defrosting means is acquired even if the step of the defrosting operation by a 1st defrosting means is skipped, it is not necessary to drastically deteriorate the energy saving performance by switching to the defrosting mode 5. none.

(Defrost mode 6)

Next, in step S305, FLAGi = 1 is not (NO), the process proceeds to step S401 and the defrost mode 6 is selected.

Moreover, when the freezer compartment temperature becomes higher than -10 degreeC in the middle of the defrosting operation by the defrost mode 4, it will transfer to defrost mode 6 from defrost mode 4. In addition, it is checked whether the defrost time of the defrost mode 4 has been performed longer than 10 minutes, and if it is performed longer than 10 minutes (for example), it proceeds to defrost mode 6, otherwise, it is normal cooling operation. Go back.

As shown in FIG. 6, the defrost by the defrost mode 6 has a freezer compartment temperature lower than -25 degreeC, and a refrigerator compartment temperature is 2 during normal cooling operation (freezer compartment cooling operation, a refrigerator compartment cooling operation, or a freezer compartment and a refrigerator compartment simultaneous cooling operation). In the case where the temperature is lower than 占 폚, the normal cooling operation is started once in step S402, in any of the cooling operation modes in step S403, and the freezer compartment temperature is lower than -25 占 폚 and the refrigerating compartment temperature is lower than 2 占 폚. It is checked whether it is satisfied, and if it is not satisfied (No), step S402 is continued, and if it is satisfied (Yes), it progresses to step S404.

In step S404, defrosting operation by the third defrosting means, "defrosting by the defrosting heater", ["compressor OFF, internal blower OFF, refrigerating chamber damper closed, freezer damper closed", but defrost heater 22 output 160W] Is done. Subsequently, the process returns to Step S212, and after that, the process returns to the normal cooling operation through the steps described above.

In the process of defrost mode 6, when the freezer compartment temperature is higher than -10 ° C in step S212 (YES), the state is stored as FLAGi = 2 in step S309. Thus, defrost mode 6 is executed again.

(Effect of Defrost Mode 6)

Next, the effect of shifting to the defrost mode 6 when the freezing chamber temperature rises again from the defrost mode 5 will be described.

Reliability ensured defrosting is carried out first when the defrost mode 4 is first performed, and the freezer temperature is markedly increased in the process, and the defrost mode 5 is shifted to the defrost mode 6 when the freezer temperature is remarkably increased during the defrost mode 5 process. To fulfill. That is, the defrost mode 6 is performed when it is determined that the freezer temperature rise is remarkable twice in the process of ensuring the defrosting, and such a case is sometimes used to open and close the doors 3a, 4a, 5a, and 5b of the freezing temperature chamber. Although there may be a case where the timing coincides with each other, in the defrosting operation (defrosting operation by the first defrosting means or the second defrosting means) in the operating state of the air blower 9, a lot of frost is generated at a location where defrosting is difficult. It is very likely that.

Therefore, in this embodiment, when it is determined that the freezer compartment temperature rise is remarkable twice, transition to defrost mode 6 causes a lot of frost to occur in a place where defrosting is difficult in defrosting operation in the operating state of the air blower 9 in operation. Even in this case, since the defrosting can be performed reliably, it is a reliable refrigerator.

Next, since a normal cooling operation is once performed when the increase in the freezer compartment temperature is remarkable, the increase in the freezer compartment temperature can be suppressed.

In addition, when the defrost time of the defrost mode 4 is not performed longer than 10 minutes, it returns to normal cooling operation (step S101), and after that, by at least one means of a 1st defrost means and a 2nd defrost means. By performing the defrosting operation, since the normal number of times of the defrosting heaters 22 is reduced, the defrosting operation with high energy saving effect can be performed.

<When priority is given to cooling machine defrosting>

Although the case where the conditions which perform reliability ensuring defrost is satisfied in step S103 was demonstrated above, the case where the condition which gives priority to cooler defrost is satisfied in step S104 is demonstrated.

If YES in step S104, it is subsequently checked whether FLAGj = 2 (step S501). If FLAGj = 2 (Yes), the flow proceeds to step S508. If FLAGj ≠ 2 (No), the flow proceeds to step S502. Here, since FLAGj = 0 is stored in the initial value setting of Step S100, FLAGj = 2 is not satisfied, and the flow advances to Steps S502 and S503 to select the defrost mode 2. Since the defrosting operation by the defrosting mode 2 is started when a refrigerator compartment temperature becomes higher than 5 degreeC during a freezer compartment cooling operation as shown in FIG. 6, a freezer compartment cooling operation (freezer compartment cooling operation is performed at the time of step S104) is performed. In step S505, it is checked whether the refrigerator compartment temperature is higher than 5 ° C., and when the refrigerator compartment temperature is higher than 5 ° C. (Yes), the procedure proceeds to step S504. When the refrigerator compartment temperature is 5 ° C. or lower (No), the refrigerator compartment temperature is Freezer cooling operation continues until it is higher than 5 ° C.

In step S504, defrosting operation ("compressor OFF, internal blower ON, freezer compartment damper closed, refrigerating chamber damper open, defrost heater OFF") by the first defrosting means is performed. In step S505, it is checked whether a cooler temperature is higher than 0.5 degreeC. If the cooler temperature is higher than 0.5 ° C. (YES), the flow proceeds to step S514 in accordance with the reference numeral (7). Otherwise, the flow proceeds to step S506. In step S506, it is checked whether the freezer compartment temperature is higher than -14 占 폚, and if the freezer compartment temperature is higher than -14 占 폚 (YES), the process proceeds to step S515; otherwise, the procedure proceeds to step S507. In step S507, it is checked whether the temperature difference (refrigerator temperature-cooler temperature) between a refrigerator compartment temperature and a cooler temperature is lower than 2 degreeC, and if a temperature difference is lower than 2 degreeC (example), it progresses to step S511, otherwise Returning to step S205, the checks of steps S505, S506 and S507 are repeated while the defrosting operation by the first defrosting means is continued.

In step S511, the defrost heater 22 is turned ON with an output 80W. Thereby, it becomes the state of defrosting operation by a 2nd defrosting means ("compressor OFF, in-air blower ON, refrigerating chamber damper opening, freezing chamber damper closing, defrost heater ON").

In step S512, it is checked whether the cooler temperature is higher than 0.5 deg. C, and if the cooler temperature is higher than 0.5 deg. C (yes), the process proceeds to step S514; otherwise, the process proceeds to step S513. In step S513, it is checked whether the freezer compartment temperature is higher than -14 占 폚, and if the freezer compartment temperature is higher than -14 占 폚 (Yes), the process proceeds to Step S514; The defrosting operation by the defrosting means is continued, and the check of step S512 or step S513, which is YES in either step S512 or step S513, is repeated.

Here, -10 degreeC which is the freezer compartment temperature in step S506, S512 corresponds to the freezer compartment temperature range upper limit temperature of Claim.

In step S514, it is stored as FLAGj = 1, and then in step S516, the internal blower 9 is turned off and the defrost heater 22 is turned off. In the case where the process proceeds to Step S515 after "Yes" in Step S513, it is stored as FLAGj = 2. Then, in Step S516, the internal blower 9 is turned OFF and the defrost heater 22 is turned OFF to proceed to Step S517. After storing FLAGk = 1 in step S517, it returns to normal cooling operation of step S101 according to code | symbol (5).

In step S501, when FLAGj = 2 (Yes), it progresses to step S508 and defrost mode 3 is selected. Since the defrosting operation by the defrosting mode 3 is started when a freezer compartment temperature becomes lower than -25 degreeC during a freezer compartment cooling operation as shown in FIG. 6, a freezer compartment cooling operation (freezer compartment cooling operation is performed at the time of step S104). Then, it is checked in step S509 whether the freezer temperature is lower than -25 ° C, and when the freezer temperature is lower than -25 ° C (Yes), the flow proceeds to step S510, and when the freezer temperature is -25 ° C or higher (no) The freezer compartment cooling operation continues until the freezer compartment temperature is lower than -25 ° C.

In step S510, it becomes a state of "compressor OFF, air blower ON, a refrigerator compartment damper open, a freezer compartment damper closed", and it progresses to step S511 and defrosting operation by a 2nd defrosting means is performed.

(Effects when giving priority to cooler defrost)

The effect of the case of giving priority to a cooler defrost is explained below.

First, the situation where it is preferable to "priority of a cooler defrost" is demonstrated. In the environmental conditions (the conditions higher than the outdoor air temperature of 35 ° C. and the humidity (relative humidity) higher than 85%) as the determination criteria in the step S104 of the flowchart of the present embodiment, the heat load is very large and frost It is a very strict condition that attachment is easy to proceed. Most of the defects that the refrigerator does not cool to a predetermined temperature occur under such a high temperature and high humidity environment. Many reasons for this are that the growth of frost leads to a lack of cooling capacity and the interior of the refrigerator cannot be maintained within a predetermined temperature range. In order to reduce such defects, it is preferable to keep the heat exchange performance of the cooler high while preventing frost growth.

In this embodiment, when it is preferable to give priority to a cooler defrost, defrost by the defrost mode 2 is performed. In the defrost by the defrost mode 2, the defrosting operation by the first defrosting means and the defrosting operation by the first defrosting means are performed when the defrosting operation by the first defrosting means is large because the temperature difference between the refrigerating chamber temperature and the cooler temperature is large. As the defrosting means, since the temperature difference between the refrigerating chamber temperature and the cooler temperature is small, when the heat exchange performance is lowered, the defrosting operation by the second defrosting means and the "defrosting by the in-air blower + defrosting heater" are performed. In addition, since the cooler temperature for determining the completion of defrosting is assumed not to be higher than 8 ° C and the cooler temperature is higher than 0.5 ° C at the time of ensuring reliability, excessively overheating the cooler 7 compared to the reliability-determined defrost. Since there is no, the frost of the cooler 7 can be melt | dissolved effectively in a short time.

Moreover, the completion determination condition of the defrost mode 2 is -14 except that the freezer temperature is -14 except that the cooler temperature at which the defrost of the cooler 7 is almost completed is higher than 0.5 ° C (step S505, step S512). Even when higher than (degreeC) (step S506, step S513) is satisfied, it is completed, and the freezer compartment temperature rises too much during the defrosting mode 2, and the possibility that a frozen food melt | dissolves does not arise.

In addition, the temperature of -14 degreeC of the determination criterion that the freezer compartment temperature rose too much is higher than the temperature of the determination criterion at the time of defrost by the defrost mode 1 -17 degreeC. Thereby, there exists a tendency for the internal temperature fluctuation range to become slightly large, but the defrost mode 2 is likely to end on the condition that the cooler temperature which can be said that the defrost of the cooler 7 is almost completed is higher than 0.5 degreeC, and frost is high. The problem that it becomes impossible to cool each room | room in a refrigerator to predetermined | prescribed temperature by growing is difficult to arise.

As described above, the second defrosting means is a defrosting means capable of cooling the refrigerating chamber 2 even though the defrosting heater is turned on (first defrosting means or the second defrosting means). During the defrosting operation by the defrosting means), since the refrigerating chamber 2 is cooled, the problem of temperature rise hardly occurs, and since the defrosting operation by the second defrosting means is performed, the defrosting can be completed in a relatively short time. As a result, the rise of the freezer compartment temperature is suppressed relatively small.

As described above, when it is preferable to give priority to defrost of the cooler 7, the refrigerator 1 of the present embodiment performs defrost in the defrost mode 2, thereby deteriorating the inside of the refrigerator due to frost growth. The problem that it cannot be maintained in a predetermined temperature range is unlikely to occur, and a refrigerator having high reliability is provided.

In addition, in the defrost mode 1, it is assumed that the user may store a large amount of food having a high temperature in the refrigerating chamber 2, and as a completion determination condition of the defrost mode 1, step S108 (the refrigerating chamber temperature is higher than 5 ° C). However, in the defrost mode 2, the step of completing the defrost by the rise of the refrigerating chamber temperature is not provided. The reason for this is that step S108 is basically a step for quickly cooling a food having a high temperature introduced into the refrigerating chamber 2, but in the refrigerator of the present embodiment, in an environment where priority is given to defrosting the cooler 7 It is important to `` keep cool in a certain temperature range '' rather than the function of `` cooling quickly '', and the step of finishing by the refrigerating chamber temperature rise is reduced in order to reduce the case where the defrost mode 2 completes before melting the frost completely. not.

(Effects when switching from defrost mode 2 to defrost mode 3)

Next, the defrost mode 3 performed when defrost mode 2 is complete | finished (step S509, step S513) because of the raise of freezer compartment temperature (freezer compartment temperature is higher than -14 degreeC) is demonstrated. When the defrost mode 2 is finished due to the rise of the freezer temperature (step S506 or step S513 is an example), the FALGj = 2 is stored in step S515. Thus, the condition of giving priority to the cooler defrost in step S104 is satisfied again. In step S501, YES is selected, and defrost mode 3 is selected (step S508). Defrost by the defrost mode 3 is started when the freezer compartment temperature becomes lower than -25 degreeC during a freezer compartment cooling operation as shown in FIG. 6, and a freezer compartment cooling operation (freezer compartment cooling operation is performed at the time of step S104). The process continues until the freezer compartment temperature becomes lower than −25 ° C. (step S509). Subsequently, it becomes a state of "compressor OFF, the high blower blower ON, the freezer compartment damper closed, and the refrigerating chamber damper open" (step S510), and it continues to "defrost heater ON (output 80W)" in step S511. Thereby, defrosting operation by a 2nd defrosting means is performed. The following returns to normal cooling operation through the steps already described (step S101).

Defrost mode 2 is terminated due to an increase in freezer temperature (freezer temperature is higher than -14 ° C) (step S506, step S513) as a reason that the user sometimes makes the ice making room 3, the upper freezer 4 or the lower freezer ( 5) is opened and stored in a relatively high temperature food, but there is also a large amount of frost, defrosting takes too much time or conveys a lot of moisture return air from the lower freezer (5) It is considered that there is a coming situation, and there are a lot of frosts in a place where defrosting in the ON state of the blower 9 in the refrigerator is difficult to defrost, and the defrosting time is extended by the influence of the frost. Basically, when the user occasionally opens and closes the ice making chamber 3, the upper freezing chamber 4 or the lower freezing chamber 5, and stores food having a relatively high temperature, the defrosting is completed (the cooler temperature is higher than 0.5 ° C) basically. It is effective to shorten the time until reaching and to sufficiently cool the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 before defrosting.

Therefore, in the defrosting mode 3, the freezing chamber temperature, the upper freezing chamber 4 or the lower freezing chamber 5 are sufficiently cooled in advance by cooling until the freezing chamber temperature becomes lower than −25 ° C. before the defrosting, and the cooler 7 In order to shorten the time until the cooler temperature, which can be said that the defrosting of almost) is almost higher than 0.5 ° C, the defrosting operation by the first defrosting means is performed and the defrosting operation by the second defrosting means is performed. Doing. Thereby, after the start of the defrost in the defrost mode 3, the time until the freezer compartment temperature is higher than -14 ° C (step S513) is satisfied, and the cooler temperature higher than 0.5 ° C (step S512) is satisfied. Since the time until it becomes short, the defrost mode 3 is satisfied that the cooler temperature is higher than 0.5 deg. Therefore, when the defrost mode 2 is terminated due to the defrost mode 2 caused by the freezer temperature rise, the defrost mode 3 is easily performed to complete the defrost of the cooler. The problem of not being able to maintain the predetermined temperature range can be made difficult.

When it is satisfied that the cooler temperature is higher than 0.5 ° C in step S512, when it is satisfied that FLAGj = 1 and the freezer compartment temperature is higher than -14 ° C in step S513, it becomes FLAGj = 2 and returns to normal cooling operation ( In step S101, when the condition to give priority to the cooler defrost is satisfied in the next step S104, defrosting in the defrost mode 2 or the defrost mode 3 is performed respectively. Thereby, when defrosting of the cooler 7 is easy to be completed, defrost mode 2 which implements the 1st defrosting means with high energy saving performance is implemented, and when the freezer temperature is easy to rise, high reliability (defrost of the cooler) Since the defrost mode 3 which is easy to be completed is implemented, it is a refrigerator which has both energy saving performance and reliability.

In addition, when the 1st defrosting means (defrost by the air blower) and the 2nd defrosting means (defrost by the air blower + defrost heater) of the refrigerator of this embodiment are implemented, the refrigerator compartment 2 and the vegetable compartment 6 of the refrigerator Since a humidification effect is also obtained, in this embodiment, it is a refrigerator with high freshness retention which can compatible energy saving performance and reliability, and suppressed drying of a refrigerating temperature zone room.

According to the present embodiment described above, a plurality of defrost modes in which defrosting operations are performed by the first to third defrosting means are set, and "defrosting by the in-air blower" operation performed at high frequency during normal freezer cooling operation (defrosting) After the defrosting (defrost modes 2 and 3) in the case of giving priority to the mode 1) and the cooler defrosting, the operation of cooling the refrigerating temperature chamber is performed once, and then the reliability ensuring defrosting (defrosting mode 4) is performed. When the freezer compartment temperature rises during the defrosting operation by 4, the defrosting operation is interrupted, the normal cooling operation is resumed, and the configuration is flexible so that the defrosting operation can be resumed by the defrosting modes 5 and 6 thereafter. Both performance and reliability can be achieved. Also, the temperature of the freezing temperature chamber rises excessively during the defrosting operation, so that the contents cannot be maintained within a predetermined temperature range. Abortion is no longer possible. In addition, cooling of the defrost (defrost modes 2 and 3) and the refrigeration temperature chamber when priority is given to the "defrost by the high-temperature blower" operation (defrost mode 1) performed before the reliability ensuring defrost (defrost mode 4) or the cooler defrost is performed. You may perform a driving multiple times. By repeating a plurality of times, the energy saving performance can be improved.

<< modification >>

Next, the modification of this embodiment is demonstrated.

In the refrigerator 1 of the above-described embodiment, the rotational speed of the in-vehicle blower 9 is reduced during the defrosting operation by the second defrosting means in the case of the normal cooling operation, which is 0 to 0 where cooling of the refrigerating chamber 2 is possible. In order to ensure that the air temperature of about 4 to 4 degreeC is obtained by cooling in the refrigerating chamber 2, in the 1st modification, in order to ensure that the air temperature of about 4 degreeC is obtained, the refrigerating-room blowing duct 11 At least one additional temperature sensor for detecting the air temperature flowing through the inner or blower outlet 2c is provided, and the signal is input to the control board 31 (see FIG. 3). And the control board 31 adjusts the output of the defrost heater 22 so that it may become the air temperature of about 0-4 degreeC based on the signal from the said additional temperature sensor during the defrosting operation by a 2nd defrosting means. It is set as a configuration.

In addition, in a 2nd modification, at this time, in addition to the adjustment of the output of the defrost heater 22, it is set as the structure which adjusts the rotational speed of the in-air blower 9 also.

As described above, in the first modified example or the second modified example, the air temperature flowing in the refrigerating chamber blowing duct 11 or the blower outlet 2c is directly detected to adjust the output of the defrost heater 22 and to rotate the blower 9 in the refrigerator. Since the speed is adjusted, the control of the refrigerating compartment temperature during the defrosting operation by the second defrosting means can be reliably performed so that the refrigerating compartment temperature is maintained or lowered.

Moreover, according to the change of the air temperature which flows in the refrigerating chamber blowing duct 11 after starting defrosting operation by a 2nd defrosting means, the output of the defrost heater 22 and the rotational speed of the in-air blower 9 are flexibly changed. Since it can change, it can respond flexibly to the change of the grade of the heat exchange of frost and air which progresses with defrost of the cooler 7.

1: refrigerator
2: Refrigerating room (refrigeration temperature room)
3: Ice making room (frozen temperature room)
4: upper freezer (freezing temperature room)
5: Lower freezer (freezing temperature room)
6: Vegetable room (cold temperature room)
7: chiller
8: Cooler storage room
9: blower (blower)
10: insulation case
11: Refrigerator ventilation duct
12: upper freezer blowing duct
13: Lower freezer ventilation duct
16: Refrigerator return duct
17: Freezer return door
20: Refrigerator Damper
22: defrost heater
24: compressor
50: freezer damper
53: upper cover

Claims (21)

A refrigeration temperature compartment, a refrigeration temperature compartment, a compressor, a cooler for cooling the refrigeration temperature compartment and the refrigeration temperature compartment, a blower for circulating cold air cooled by the cooler in the freezing temperature compartment and the refrigeration temperature compartment; A refrigerator comprising: a freezer compartment damper for controlling the blowing from the cooler to the freezing temperature chamber, a refrigerator compartment damper for controlling the blowing from the cooler to the cold storage temperature chamber, and a defrost heater for melting frost attached to the cooler. ,
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
Defrosting the cooler by the second defrosting means while blowing the cool air cooled by the latent heat to the cold storage temperature chamber so as to cool the cold storage temperature chamber by the latent heat of frost attached to the cooler, and the defrost is considered to be completed. At the timing which can be made, the airflow of the said cold air to the said refrigeration temperature chamber is stopped, After that, the said defrost heater is kept in an energized state, and defrosting is performed by making the said blower stop state. A refrigeration temperature compartment, a refrigeration temperature compartment, a compressor, a cooler for cooling the refrigeration temperature compartment and the refrigeration temperature compartment, a blower for circulating cold air cooled by the cooler in the freezing temperature compartment and the refrigeration temperature compartment; A refrigerator comprising: a freezer compartment damper for controlling the blowing from the cooler to the freezing temperature chamber, a refrigerator compartment damper for controlling the blowing from the cooler to the cold storage temperature chamber, and a defrost heater for melting frost attached to the cooler. ,
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
Defrosting the cooler by the second defrosting means while blowing the cool air cooled by the latent heat to the cold storage temperature chamber so as to cool the cold storage temperature chamber by the latent heat of frost attached to the cooler, and the defrost is considered to be completed. After stopping the blowing of the cold air to the refrigerating temperature chamber at a timing that can be performed, and performing the operation of cooling the refrigerating temperature chamber once or plural times,
The defrosting operation by the third defrosting means which stops the said compressor, makes the said freezer compartment damper into the closed state, puts the said refrigerator compartment damper into the closed state, energizes the said defrost heater, and defrosts with the said blower stopped. The refrigerator characterized by the above-mentioned. A refrigeration temperature compartment, a refrigeration temperature compartment, a compressor, a cooler for cooling the refrigeration temperature compartment and the refrigeration temperature compartment, a blower for circulating cold air cooled by the cooler in the freezing temperature compartment and the refrigeration temperature compartment; A refrigerator comprising: a freezer compartment damper for controlling the blowing from the cooler to the freezing temperature chamber, a refrigerator compartment damper for controlling the blowing from the cooler to the cold storage temperature chamber, and a defrost heater for melting frost attached to the cooler. ,
When the compressor is stopped, the freezer compartment damper is in a closed state, the refrigerating compartment damper is in an open state, and the defrost heater is energized, and the blower is provided with second defrosting means for defrosting.
Defrosting the cooler by the second defrosting means while blowing the cool air cooled by the latent heat to the cold storage temperature chamber so as to cool the cold storage temperature chamber by the latent heat of frost attached to the cooler, and the defrost is considered to be completed. After stopping the airflow of the cold air to the said refrigeration temperature chamber at the timing which can be made, after operating the compressor and performing the cooling operation of the said refrigeration temperature chamber for a predetermined time,
The defrosting operation by the third defrosting means which stops the said compressor, makes the said freezer compartment damper into the closed state, puts the said refrigerator compartment damper into the closed state, energizes the said defrost heater, and defrosts with the said blower stopped. The refrigerator characterized by the above-mentioned. The defrosting operation according to claim 3, wherein when the defrosting operation by the second defrosting means is less than a predetermined time, the defrosting operation by the second defrosting means is performed after operating the compressor to perform a cooling operation of the refrigerating temperature chamber for a predetermined time. And defrosting operation by the third defrosting means. The said freezer compartment damper is set to the closed state, the said refrigerator compartment damper is set to the open state, the said defrost heater is set to the non-energized state, at the time of the said compressor stopping. A refrigerator comprising: a first defrosting means for defrosting by operating a blower, and raising the temperature of the refrigerating temperature chamber to a predetermined temperature before performing a defrosting operation by the first defrosting means. The refrigerator according to any one of claims 1 to 3, wherein the amount of electricity supplied to the defrost heater is adjusted during the defrosting operation by the second defrosting means. The refrigerator according to any one of claims 1 to 3, wherein the rotation speed of the blower is adjusted during the defrosting operation by the second defrosting means. The refrigerator according to any one of claims 1 to 3, wherein an amount of electricity supplied to the defrost heater and a rotation speed of the blower are adjusted during the defrosting operation by the second defrosting means. The said freezer compartment damper is set to the closed state, the said refrigerator compartment damper is set to the open state, the said defrost heater is set to the non-energized state, at the time of the said compressor stopping. And a first defrosting mode for defrosting by the second defrosting means after the defrosting operation by the first defrosting means;
In the first defrost mode, the defrosting operation by the first defrosting means is terminated when the difference between the temperature of the refrigerating temperature chamber and the temperature of the cooler is equal to or less than a predetermined temperature difference, and the defrosting operation by the second defrosting means is terminated. Refrigerator, characterized in that carried out. The second defrost mode according to claim 2 or 3, wherein the defrosting operation is performed by the third defrosting means after the defrosting operation by the second defrosting means.
In the second defrosting mode, the defrosting operation by the second defrosting means ends when the temperature of the cooler becomes higher than the predetermined first cooler temperature of 0 ° C. or more, and the defrosting operation by the third defrosting means is performed. Refrigerator characterized in that the. The defrosting operation by the second defrosting means is finished when the temperature of the cooler becomes higher than the temperature of the refrigerating temperature chamber, and the defrosting by the third defrosting means is performed in the second defrosting mode. A refrigerator, characterized in that operation is performed. The defrosting operation by the third defrosting means is terminated when the temperature of the cooler rises to a temperature of a predetermined second cooler. The refrigerator according to claim 2 or 3, wherein the third defrosting means is implemented when the temperature of the freezing temperature range rises above a predetermined freezing temperature range upper limit temperature. delete delete delete delete delete delete delete delete

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