KR20000022624A - Refrigerator - Google Patents

Abstract

PURPOSE: A refrigerator is provided to remove the dust adhered to a valve unit as well as to detect the valve leakage. CONSTITUTION: Temperature of a refrigerating chamber(14) is raised when cooling a freezing chamber(18) if a three-way valve(68) is normal without valve leakage. Refrigerants flow to an F evaporator(24) in a normal freezing mode, not to an R evaporator(34) so the R evaporator as to keep the same temperature as one of the refrigerating chamber. However, the R evaporator is cooled by the leaked refrigerant, and the detected temperature of an R evaporator sensor(38) is fallen and not raised up to the temperature of the refrigerating chamber if the refrigerant starts to be leaked to the R evaporator by the valve leakage in a freezing mode. Therefore, it is judged that the valve leakage occurs if the R evaporator sensor does not exceed the set value after setting the reference value slightly lower than that of the freezing chamber.

Description

Refrigerator {REFRIGERATOR}

The present invention relates to a refrigerator having two evaporators.

In recent refrigerators, in order to efficiently cool a refrigerator compartment and a freezer compartment, what has a refrigerator evaporator and a freezer evaporator is proposed.

In order to efficiently cool the two evaporators with the refrigerant sent from one compressor, a three-way valve is provided in the middle of the refrigerant flow path and whether the refrigerant is sent to the refrigerating evaporator or the freezing evaporator by switching the three-way valve. Is determined.

However, there are cases where dust flows into the refrigerant flow path during manufacture and the like, and this dust accumulates in the three-way valve, and the three-way valve does not operate normally, so-called valve leakage may occur.

Valve leakage means that the refrigerant flows to the refrigeration evaporator even though the three-way valve is being converted to the refrigeration evaporator and leaks to the refrigeration evaporator. Not only flows to the side, but also leaks into the freezing evaporator. In the conventional refrigerator, such a valve leakage phenomenon could not be detected.

In the case of such a valve leakage phenomenon, there is no structure in the conventional refrigerator to remove the dust attached to the three-way valve.

Thus, the present invention provides a refrigerator capable of detecting a valve leak and removing dust attached to the valve mechanism in view of the above problem.

1 is an explanatory diagram of a refrigerator of this embodiment;

2 is an explanatory diagram of a refrigeration cycle;

3 is a longitudinal sectional view of a three-way valve;

4 is an explanatory view of the valve leak detection method of the first and fifth;

5 is an explanatory diagram of a second valve leak detection method;

6 is an explanatory diagram of a third valve leak detection method;

7 is an explanatory diagram of a fourth valve leak detection method;

8 is a flowchart showing a control state of the defrosting operation in the case of detecting a valve leakage;

9 is an explanatory view of a modification of the refrigeration cycle.

* Explanation of symbols for the main parts of the drawings

10: refrigerator 20: compressor

24: F Ever 30: F Ever Sensor

34: R Ever 38: R Ever Sensor

44: controller 68: three-way valve

The refrigerator of claim 1 of the present invention comprises a compressor, a condenser, a refrigeration throttle mechanism, a refrigerating evaporator corresponding to a refrigerating chamber, a refrigeration throttle mechanism, and a refrigerating evaporator corresponding to a freezing chamber to form a refrigerant flow path, and a refrigerant by a valve mechanism. In the refrigerator which can realize a refrigerating mode which switches a flow path, a refrigerant | coolant flows to the refrigeration evaporator side through a refrigeration throttle mechanism, and a refrigeration mode which flows refrigerant only into a refrigeration evaporator via a refrigeration throttle mechanism, Valve leakage determination means for judging valve leakage of the refrigerant to the refrigeration evaporator or valve leakage of the refrigerant to the refrigeration evaporator.

The refrigerator of claim 2, wherein the refrigerator includes a refrigeration evaporator temperature detection means for detecting a temperature of the refrigeration evaporator, and the valve leak determination means is a temperature detected by the refrigeration evaporator temperature detection means in the freezing mode. When the temperature falls below the set temperature, it is determined that the refrigerant leaks into the refrigeration evaporator of the valve mechanism.

The refrigerator of claim 3, wherein the refrigerator comprises a refrigerating evaporator temperature detecting means for detecting a temperature of the refrigerating evaporator, and the valve leak determining means is a temperature detected by the refrigerating evaporator temperature detecting means in the freezing mode. When the temperature falls below the set temperature and the operating frequency of the compressor is higher than the set frequency, it is determined that the refrigerant leaks into the refrigeration evaporator of the valve mechanism.

The refrigerator of claim 4, wherein the refrigerator comprises a refrigeration evaporator temperature detection means for detecting the temperature of the refrigeration evaporator and the valve leak determination means in the freezing mode, the temperature detected by the refrigeration evaporator temperature detection means And when the difference with the temperature in the refrigerating mode of the refrigerating evaporator temperature detection means is within the set temperature range, it is determined that the refrigerant leaks into the refrigerating evaporator of the valve mechanism.

The refrigerator of claim 5, wherein the refrigerator includes a freezing evaporator temperature detecting means for detecting a temperature of the freezing evaporator, and the valve leakage determining means is a temperature detected by the freezing evaporating temperature detecting means in the freezing mode. When the difference with the temperature in the refrigerating mode of the freezing evaporator temperature detection means is within the set temperature range, it is determined that the refrigerant leaks into the refrigerating evaporator of the valve mechanism.

The refrigerator of claim 6, wherein the refrigerator comprises a freezing evaporator temperature detecting means for detecting a temperature of the freezing evaporator and the valve leak determining means is a freezing mode, the temperature detected by the freezing evaporator temperature detecting means. If the difference between the temperature in the refrigerating mode of the freezing evaporator temperature detection means is within a set temperature range, it is determined that the refrigerant leaks into the freezing evaporator of the valve mechanism.

The refrigerator of claim 7 includes dust removing means for removing dust from the valve mechanism by forcibly operating the valve mechanism when it is determined that the valve leak determining means is a valve leak.

The refrigerator according to claim 8, wherein the dust removing means forcibly operates the valve mechanism while raising the operating frequency of the compressor when the valve leak determining means determines that the valve leaks.

In the refrigerator according to claim 9, the dust removing means stops the valve mechanism in the middle of switching the refrigerant flow path while raising the operating frequency of the compressor when the valve leak determining means determines that the valve leaks.

The refrigerator according to claim 10, wherein the dust removing means is configured to force the valve mechanism to be shorter than the normal operation time when it is determined that the valve leak determining means is a valve leak.

The refrigerator according to claim 11 is characterized in that, after the dust removing means removes the dust, when the valve leak determining means is again determined to be a valve leak, the refrigeration evaporator and the refrigeration evaporator perform a defrosting operation for valve leakage. And removal control means.

The refrigerator according to claim 12, wherein the defrosting control means controls the defrosting operation of the refrigeration evaporator to be shorter than the defrosting operation of the refrigeration evaporator in a normal state, and the defrosting operation for valve leakage. When the valve leakage determination means judges that the valve is leaked three times after the operation, the defrosting operation interval of the freezing evaporator and the refrigeration evaporator is the defrosting interval of the freezing evaporator.

In the refrigerator of claim 1, the valve leak determining means can determine the valve leak of the valve mechanism.

In the refrigerator according to claim 2, the valve leakage determining means determines that the valve leakage of the refrigerant to the refrigerating evaporator of the valve mechanism occurs when the temperature detected by the refrigerating evaporator temperature detection means is lower than the set temperature in the freezing mode. .

In the refrigerator according to claim 3, the valve leakage determining means is a refrigeration evaporator for the valve mechanism when the temperature detected by the refrigerating evaporator temperature detection means is below the set temperature and the operating frequency of the compressor is higher than the set frequency in the freezing mode. It is determined that a valve leak of refrigerant in the furnace has occurred.

In the refrigerator of claim 4, the valve leakage determining means is a refrigeration evaporator temperature detecting means in the freezing mode, and when the difference between the temperature in the refrigerating mode and the temperature in the refrigerating mode is within the set temperature range, It is determined that a valve leak has occurred.

In the refrigerator of claim 5, the valve leakage determining means is a refrigeration evaporator in the freezing mode, and when the difference between the temperature detected by the freezing evaporator temperature detection means and the temperature in the refrigerating mode is within the set temperature range, It is determined that the valve leakage of the refrigerant has occurred.

In the refrigerator of claim 6, the valve leak determining means is a refrigeration evaporator in the refrigerating mode, when the temperature detected by the freezing evaporator temperature detection means is within a set temperature range when the temperature is different from the temperature in the refrigerating mode. It is determined that the valve leakage of the refrigerant has occurred.

In the refrigerator of claim 7, dust is accumulated in the valve mechanism when the valve leakage determination means determines that the valve is leaked. Therefore, the dust removing means forcibly operates the valve mechanism to remove the dust.

In the refrigerator of claim 8, when it is determined that the valve leak determining means is a valve leak, the dust removing means forcibly operates the valve mechanism while blowing up the dust while raising the operating frequency of the compressor.

In the dust removing means of claim 9, when it is determined that the valve leak determining means is a valve leak, the dust attaching means stops the valve mechanism in the middle of switching the refrigerant flow path while removing the dust while raising the operating frequency of the compressor.

In the refrigerator of claim 10, when it is determined that the valve leakage determining means is a valve leakage, the dust removing means shortens the valve mechanism by a normal operation time to forcibly operate to remove dust.

In the refrigerator of claim 11, after the valve mechanism, which is a dust removing means, is forcibly operated, when the valve leakage determining means is again determined to be a valve leak, the valve leakage is prevented to prevent sticking to the freezing evaporation mechanism and the refrigeration evaporation mechanism. Perform defrost operation.

In the refrigerator according to claim 12, the defrosting control means determines the interval between defrosting operations of the freezing evaporator and the refrigeration evaporator after determining that the valve leakage determining means is a valve leak after performing the defrosting operation. The defrosting operation is performed shorter than the conventional defrosting interval.

Hereinafter, the refrigerator 10 of one Example of this invention is demonstrated based on drawing.

1 is a simplified longitudinal cross-sectional view of the refrigerator 10 and also illustrates the electric system. 2 is an explanatory view of a refrigeration cycle of the refrigerator 10.

First, it demonstrates based on FIG.

In the cabinet 12 of the refrigerator 10, the refrigerating chamber 14, the vegetable chamber 16, and the freezing chamber 18 are provided from the upper end. The freezing chamber 18 is provided with an ice making device (not shown).

The machine room 22 in which the compressor 20 is arrange | positioned is provided in the back bottom part of the freezer compartment 18. As shown in FIG. Further, a freezer compartment evaporator (hereinafter referred to as an F-aver) 24 is disposed at the rear of the freezer compartment 18, and cold air generated in the F-aver 24 is blown to the freezer compartment 18 above the F-ever 24. A freezer compartment fan (hereinafter referred to as an F fan) 26 is provided. Below the F-aver 24, a defrost heater (hereinafter referred to as an F-defrost heater) 28 for defrosting the F-aver 24 is provided. In the vicinity of the upper part of the F ever 24, an F ever sensor 30 for detecting the temperature of the F ever 24 is provided.

In the freezer compartment 18, a freezer compartment temperature sensor (hereinafter referred to as an F sensor) 32 for measuring the temperature in the freezer compartment is provided.

A refrigerator compartment evaporator (hereinafter referred to as R ever) is installed on the rear of the vegetable compartment 16, and a refrigerator compartment fan (hereinafter referred to as an R fan) 36 is installed above the R ever 34, and an R ever The R ever sensor 38 which detects the temperature of 34 is provided. Below the R ever 34, a defrost heater (hereinafter referred to as R defrost heater) 40 for defrosting the R ever 34 is provided.

In the refrigerating chamber 14, a refrigerating chamber temperature sensor (hereinafter referred to as R sensor) 42 for measuring the refrigerating chamber temperature is provided.

The F fan 26, F defrost heater 28, F ever sensor 30, F sensor 32, R fan 36, R ever sensor 38, and R defrost heater 40 And the R sensor 42 are connected to a control device 44 made of a microcomputer. The said control apparatus consists of one board | substrate, and is provided in the upper back part of the cabinet 12. As shown in FIG. In addition, the motor of the compressor 20 is also connected to the control device 44.

Next, the flow of cold air is demonstrated based on FIG.

The cold air cooled by the F ever 24 is blown by the F fan 26 to circulate through the freezing chamber 18. The cold air cooled by the R ever 34 is blown into the vegetable chamber 16 and the refrigerating chamber 14 by the R fan 36 to circulate.

Next, the structure of this refrigeration cycle is demonstrated based on FIG.

A condenser 46 is connected to the compressor 20, and a three-way valve 68 is connected to the condenser 46. One of the refrigerant flow passages divided into two from the three-way valve 68 is connected to a refrigerating chamber capillary tube (hereinafter referred to as R capillary tube) 50 and to the R ever 34. In addition, the other refrigerant flow path divided from the three-way valve 68 is connected to the F-aver 24 through the freezing chamber capillary tube (hereinafter referred to as F capillary tube) 52. The refrigerant flow paths of the F ever 24 and the R ever 34 are composed of one and circulated through the compressor 20.

Next, the three-way valve 68 is demonstrated based on FIG.

FIG. 3 shows a cross-sectional view of a three-way valve 68 and consists of a so-called solenoid structure consisting of a coil 102, a magnet 104, a plunger 106, and the like. The pin 108 is provided in the lower part of the plunger 106, and the coil 102 is illustrated so that the pin 108 may be driven downward and the valve body 110 may be driven downward against the spring 112. As shown in FIG. In this state, the refrigerant flows from the condenser 46 to the R ever 34. In addition, when the plunger 106 returns, the valve body 110 returns upward and the refrigerant flows to the F ever 24 from the condenser 46. In the drawings, reference numeral 116 denotes a refrigeration valve seat and reference numeral 118 denotes a refrigeration valve seat.

A. Valve Leak Detection Method

In the refrigerator 10 having the above structure, a detection method in the case where a valve leak of the three-way valve 68 occurs will be described.

That is, in the three-way valve 68, since some dust in the refrigerating cycle may be caught between the valve body 110 and the valve seats 116 and 118, some valve leakage may occur. Therefore, five types of detection methods in the case where the valve leakage occurs will be described.

1. The first valve leak detection method

A first valve leak detection method will be described with reference to FIG. 4.

(Normal)

When there is no valve leakage of the three-way valve 68 and is normal, the R defrost sensor rises to the refrigerating chamber temperature (0 ° C to 3 ° C) when the freezing chamber 18 is cooled (hereinafter referred to as a freezing mode). . That is, in the normal freezing mode, all of the refrigerant flows in the F-aver 24 and not in the R-aver 34, so that the R-aver 34 is not cooled and is at the same temperature as the refrigerating chamber 14.

(If abnormal)

However, in the freezing mode, when the refrigerant begins to leak to the R ever 34 due to the valve leak, the R ever 34 is cooled by the leaked coolant, and the detection temperature of the R ever sensor 38 is lowered and the refrigerating compartment temperature is reduced. Does not rise until.

Therefore, as shown in FIG. 4, when the set value is set to a temperature slightly lower than the freezer compartment temperature, and this is set as the threshold value, the R-aver sensor 38 does not exceed the set value, it is determined that a valve leak has occurred. .

(Change example)

In the above judgment, if it is determined that the valve leaks immediately when the temperature of the F-average sensor 38 before the end value of the freezing mode has not reached the set value, a malfunction may occur.

Therefore, in order to prevent this malfunction, the temperature of the R ever sensor 38 immediately before the end of the next freezing mode is below the set value and the temperature of the R ever sensor 38 immediately before the end of the third freezing mode is less than or equal to the set value. At this time, it may be determined that a valve leak occurs in the three-way valve 68.

The number of times is not limited to three times but may be two or four times.

2. The second valve leak detection method

A second valve leak detection method will be described with reference to FIG. 5.

(Normal)

There is no valve leakage in the three-way valve 68, and in the normal case, the F-aver sensor 30 has a temperature difference of about 10 to 15 DEG C in the freezing mode and the cooling of the refrigerating chamber 14 (hereinafter referred to as the refrigeration mode). do. That is, when the refrigerant flows through the F ever 24, the F ever 24 is cooled and the temperature is lowered. On the other hand, if the refrigerant does not flow in the F-aver 24, the temperature rises, so the temperature difference is about 10 ° C to 15 ° C.

(If abnormal)

However, when the refrigerant starts to leak to the F ever 24 side in the refrigerating mode, the temperature of the F ever 24 is lowered and the detection temperature of the F ever sensor 30 is lowered, and the temperature difference between the freezing mode and the refrigerating mode is small. Lose. Therefore, when this temperature difference becomes below the set temperature value, it is determined that the refrigerant leaks to the F-aver 24.

(Change example)

In addition, similarly to the first detection method, the valve leakage detection may be determined to be the first valve leakage when the phenomenon occurs three times.

3. Third Valve Leak Detection Method

Next, a third valve leak detection method will be described based on FIG. 6.

(Normal)

In the freezing mode, the R-average sensor 38 rises to the refrigerating chamber temperature (0 ° C to 3 ° C) in the freezing mode if there is no valve leak in the three-way valve 68. That is, in the freezing mode, since no refrigerant flows to the R ever 34 at all, it is not cooled and becomes equal to the temperature of the refrigerating chamber 14.

(If abnormal)

However, in the freezing mode, when cold air begins to leak to the R ever 34, the temperature of the R ever 34 is lowered by the cold air and the temperature of the R ever sensor 38 is lowered, and thus the temperature of the refrigerating chamber 14 is reduced. Does not rise until. When the set value is determined at a temperature slightly lower than the refrigerating chamber temperature, the temperature of the R ever sensor 38 becomes less than or equal to the set value.

In addition, since the valve leakage occurs in the R-aver 34, the operating frequency of the compressor 20 increases the operating frequency to compensate for the lack of capacity. Therefore, when the detection temperature of the R ever sensor 38 is below the set value and the operating frequency of the compressor 20 rises above the set frequency, it is determined that cold air is leaking to the R ever 34. As a result, the valve leak can be determined more reliably than in the first valve leak detection method.

(Change example)

Also, in the valve leakage detection, it may be determined that the valve is leaked only when it occurs three times continuously in the same manner as in the first valve leakage detection method.

4. Fourth Valve Leak Detection Method

A fourth valve leak detection method will be described with reference to FIG.

(Normal)

In the three-way valve 68, there is no valve leak, and in the normal case, the detection temperature of the R ever sensor 38 rises to the refrigerating chamber temperature (0 ° C to 3 ° C). This is because no refrigerant flows through the R ever 34 and the temperature of the R ever 34 rises.

(If abnormal)

When cold air starts to leak to the R ever 34 in the freezing mode, the temperature of the R ever 34 is lowered, so that the detection temperature of the R ever sensor 38 is lowered and does not rise to the refrigerating chamber temperature. Therefore, the temperature difference between the detection temperature of the R ever sensor 38 in the refrigerating mode and the detection temperature in the freezing mode in the present state becomes small. Therefore, when the temperature difference becomes less than the set temperature difference, it is determined that the refrigerant leaks to the R ever 34 in the freezing mode.

(Change example)

Also, in the valve leak detection method, it may be determined that the valve leak has occurred only when three consecutive occurrences occur in the same manner as the detection method.

5. The fifth valve leak detection method

A fifth valve leak detection method will be described with reference to FIG. 4.

(Normal)

If there is no valve leakage of the three-way valve 68 and is normal, the detection temperature of the F-average sensor 30 decreases to about -30 ° C in the freezing mode. That is, since the refrigerant does not flow completely through the R ever 34 but only the F ever 24, the temperature decreases.

(If abnormal)

When the refrigerant starts to leak to the R ever 34 in the freezing mode, the F ever 24 is not completely cooled and the detection temperature of the F ever sensor 30 is increased, and the F ever sensor 30 is detected in the refrigerating mode. The temperature difference between the temperature and the detection temperature in the freezing mode decreases. Therefore, when this temperature difference becomes below the set temperature difference, it detects that the refrigerant leaks to the R ever 34 in the freezing mode.

(Change example)

In addition, in the detection method described above, it may be determined that a valve leak occurred only when three consecutive occurrences occur in the same manner as the detection method described above.

By using the valve leak detection method described above, it is possible to reliably detect whether a valve leak of the three-way valve 68 has occurred.

B. How to remove dust

Next, a control method for removing dust that is the cause of the valve leakage when it is determined that the valve leakage has occurred in the three-way valve 68 will be described.

1. The first removal method

The first method of removing dust in the event of a valve leak in the three-way valve 68 is to operate the valve body 110 by forcibly operating the plunger 106 by a solenoid and to remove dust adhered to the surroundings. To remove it.

2. The second removal method

As the second removal method, in addition to the first removal method, the operating frequency of the compressor 20 is increased, the pressure of the refrigerant flowing through the three-way valve 68 is increased, and the circulation amount is increased, thereby adhering to the dust adhesion of the valve body 110. To increase the flow rate of the refrigerant to blow dust away. Thereby, in addition to forcibly operating the valve body 110, since dust is blown away by a refrigerant | coolant, dust can be removed reliably.

3. Third dust removal method

In the third removal method, when it is detected that a valve leak has occurred, the valve body 110 is stopped at an intermediate point so that the refrigerant flows to both sides. In this state, the operating frequency of the compressor 20 is increased to increase the pressure, and the circulation amount is increased to increase the refrigerant flow rate near the dust attachment portion of the valve body 110 to blow off the dust.

4. 4th dust removal method

In the first and second dust removal methods, the operation of the valve body 110 (the plunger 106) was performed over about 4 seconds, but in order to speed this up, the voltage was increased to operate for about 1 second. To facilitate the removal of dust, the valve body 110 operates rapidly and enhances the valve operation shock.

C. Control method of eliminating valve leakage defrost

Next, a valve leakage defrosting control method in the case where the valve leakage detection is carried out and the removal is impossible even though the dust removal control as described above is performed will be described based on the flowchart of FIG.

As described above in Step 1, it is detected whether or not a valve leak has occurred. If a valve leak has occurred, the flow proceeds to Step 2. If no valve leakage occurs, return to normal operation.

In step 2, the dust removal control method described above is carried out to remove dust and to proceed to step 3.

In step 3, it is judged again whether or not the valve leak is detected. If no valve leak is detected, the operation returns to normal operation and when the valve leak is detected (that is, a total of two valve leaks are detected), the flow proceeds to step 4.

Since the valve leak is detected twice in Step 4, the F-aver 24 and the R-aver 34 may be cooled more than necessary and adhesion may occur, so the F-aver 24 and the R-aver 34 After defrosting, proceed to step 5.

After completion of defrosting in step 5, if valve leakage is detected again (that is, detection of valve leakage three times in total), the flow advances to step 6 and returns to normal operation if it is detected.

Since the valve leak was detected three times in Step 6, the defrosting control interval of the R-aver 34 is switched to the defrosting interval of the F-aver 24. This is because, in normal operation, the defrosting operation of the R ever 34 is greater than the defrosting operation of the F ever 24. Therefore, if the defrosting operation of the R ever 34 is performed at the defrosting operation of the R ever 34, the attachment to the defrosting occurs. This is because it is likely to occur.

On the other hand, when the defrosting control method is viewed at another point in time, the R-aver 34 leaks more than necessary due to valve leakage. If defrosting by valve leakage is determined to be defrosting during normal operation and defrost control is performed in the same manner as in normal operation, defrosting operation is performed more than necessary. Therefore, when such valve leakage is detected three times, the defrosting operation interval of the R-aver 34 is set as the defrosting operation interval to distinguish between valve leakage detection and defrosting detection and to prevent unnecessary defrosting control. It also has the effect.

In addition, the refrigerator 10 of the above embodiment has been described based on the refrigeration cycle shown in FIG. 2, but instead of the same, the refrigerator 10 may be similarly implemented in other refrigeration cycles as shown in FIG. 9. Can be.

According to the refrigerator of the present invention as described above, valve leakage can be reliably detected, and in the case of valve leakage, dust which is the cause can be easily removed.

Claims (12)

A refrigerant flow path is constructed by connecting a compressor, a condenser, a refrigeration throttle mechanism, a refrigeration evaporator corresponding to a refrigerating compartment, a refrigeration throttle mechanism, and a refrigeration evaporator corresponding to a freezing compartment. In a refrigerator capable of realizing a refrigerating mode in which the refrigerant flows through the refrigeration throttle mechanism by the valve mechanism and flows the refrigerant to the refrigerating evaporator side, and a refrigerating mode in which the refrigerant flows only in the refrigerating evaporator through the refrigeration throttle mechanism. , And a valve leak determining means for judging valve leakage of the refrigerant to the refrigerating evaporator of the valve mechanism or valve leakage of the refrigerant to the refrigeration evaporator. The method of claim 1, The refrigerator includes a refrigeration evaporator temperature detection means for detecting the temperature of the refrigeration evaporator, The valve leakage determining means is a refrigerator, characterized in that, in the refrigerating mode, when the temperature detected by the refrigerating evaporator temperature detection means becomes lower than or equal to the set temperature, it is determined that the valve is a valve leak of the refrigerant to the refrigerating evaporator of the valve mechanism. The method of claim 1, The refrigerator includes a refrigeration evaporator temperature detection means for detecting the temperature of the refrigeration evaporator, The valve leak judging means is a valve leak of refrigerant to the refrigeration evaporator of the valve mechanism when the temperature detected by the refrigeration evaporator temperature detection means in the freezing mode is below the set temperature and the operating frequency of the compressor is higher than the set frequency. The refrigerator characterized by judging. The method of claim 1, The refrigerator includes a refrigeration evaporator temperature detection means for detecting the temperature of the refrigeration evaporator, The valve leakage determining means is a refrigerant to the refrigerating evaporator of the valve mechanism when the difference between the temperature detected by the refrigerating evaporator temperature detecting means in the freezing mode and the temperature of the refrigerating evaporator temperature detecting means is within a set temperature range. Refrigerator characterized in that it is determined that the valve leak. The method of claim 1, The refrigerator includes a freezing evaporator temperature detection means for detecting the temperature of the freezing evaporator, The valve leakage judging means is the refrigeration evaporator of the valve mechanism when the difference between the temperature detected by the freezing evaporator temperature detection means and the temperature in the refrigerating mode of the freezing evaporator temperature detection means is within a set temperature range. Refrigerator characterized in that the valve leakage of the refrigerant. The method of claim 1, The refrigerator includes a freezing evaporator temperature detection means for detecting the temperature of the freezing evaporator, In the freezing mode, the valve leakage judging means is provided to the freezing evaporator of the valve mechanism when the temperature detected by the freezing evaporator temperature detecting means is within the set temperature range when the temperature of the freezing evaporator temperature detecting means is within the set temperature range. Refrigerator characterized in that the valve leakage of the refrigerant. The method of claim 1, And a dust removing means for forcibly operating the valve mechanism to remove dust from the valve mechanism when it is determined that the valve leak determining means is a valve leak. The method of claim 7, wherein And the dust removing means forcibly operates the valve mechanism while raising the operating frequency of the compressor when the valve leak determining means determines that the valve leaks. The method of claim 7, wherein And the dust removing means stops the valve mechanism in the middle of switching the refrigerant passage while raising the operating frequency of the compressor when the valve leakage determining means determines that the valve is leaking. The method of claim 7, wherein And the dust removing means forcibly operates the valve mechanism by shortening the valve mechanism when it is determined that the valve leakage determining means is a valve leakage. The method according to any one of claims 7 to 10, And a defrost control means for defrosting the valve leakage of the freezing evaporator and the refrigerating evaporator after the dust removing means removes the dust and judges that the valve leak determining means is a valve leak. The method of claim 11, Defrost control means to remove the defrost operation of the refrigeration evaporator shorter than the defrost operation of the refrigeration evaporator in the normal state, After the defrosting operation for valve leakage is performed, when the valve leakage determining means determines that the valve is leaking, the defrosting operation interval between the freezing evaporator and the refrigeration evaporator is a defrosting interval of the freezing evaporator. .