CN1247302A - Refrigerator - Google Patents

Abstract

A refrigerator that detects valve leaks and removes debris adhering to the valve mechanism. The refrigerator 10 uses the three-way valve 68 to switch when the refrigerant flows to the R evaporator 34 and the F evaporator 24. When the three-way valve 68 is detected to have valve leakage, the three-way valve 68 is forced to act to remove garbage and eliminate valve leakage. .

Description

refrigerator

The present invention relates to a refrigerator having two evaporators.

Regarding recent refrigerators, there have been proposed refrigerators provided with refrigerating evaporators and freezing evaporators in order to efficiently cool the refrigerating chamber and the freezing chamber, respectively.

In order to efficiently cool the two evaporators with the refrigerant sent from one compressor, a three-way valve is installed in the middle of the refrigerant flow path, and the refrigerant is sent to the evaporator for refrigeration or for freezing by switching the three-way valve. Evaporator.

However, in the refrigerant flow path, garbage may be mixed in during manufacturing, etc., and the garbage clogs the three-way valve, so that the three-way valve does not work normally, and so-called valve leakage occurs.

The so-called valve leakage refers to the following phenomenon: Although the three-way valve has been switched to the evaporator for freezing, the refrigerant does not only flow to the evaporator for freezing but also leaks to the evaporator for refrigeration, or on the contrary, although it has been switched To the evaporator for refrigeration, the refrigerant does not only flow to the evaporator for refrigeration, but also leaks to the evaporator for refrigeration. Also, existing refrigerators cannot detect such a valve leakage phenomenon.

In addition, conventional refrigerators do not have a structure for removing the garbage adhering to the three-way valve when such a valve leakage phenomenon occurs.

In view of the above-mentioned problems in the prior art, it is an object of the present invention to provide a refrigerator capable of detecting valve leakage and removing debris adhering to the valve mechanism.

In the refrigerator according to technical solution 1 of the present invention, a compressor, a condenser, a throttle mechanism for refrigeration, an evaporator for refrigeration corresponding to the refrigerator compartment, a throttle mechanism for freezing, and an evaporator for refrigeration corresponding to the freezer compartment are connected. The refrigerant flow path is formed, and the refrigerant flow path is switched by the valve mechanism, which can realize the refrigeration operation mode in which the refrigerant flows into the evaporator side through the throttling mechanism for refrigeration, and the refrigerant only flows into the evaporator side through the throttling mechanism for refrigeration. The refrigeration operation mode of the refrigeration evaporator is provided with a valve leakage judging means for judging the leakage of refrigerant to the valve of the refrigeration evaporator or the leakage of refrigerant to the valve of the refrigeration evaporator in the valve mechanism.

The refrigerator of the technical solution 2 of the present invention is based on the technical solution 1, and is also provided with a refrigerating evaporator temperature detection means for detecting the temperature of the refrigerating evaporator. If the output temperature is below the set temperature, the valve leakage judging means judges that the valve mechanism has refrigerant leakage to the valve of the refrigerating evaporator.

The refrigerator of the technical solution 3 of the present invention is based on the technical solution 1, and is also equipped with a refrigerating evaporator temperature detection means for detecting the temperature of the refrigerating evaporator. In the freezing operation mode, once the refrigerating evaporator temperature detection means measures When the output temperature is lower than the set temperature and the operating frequency of the compressor is higher than the set frequency, the valve leakage judging means judges that the valve mechanism has refrigerant leakage to the valve of the refrigerating evaporator.

The refrigerator of the technical solution 4 of the present invention is based on the technical solution 1, and is also provided with a refrigerating evaporator temperature detection means for detecting the temperature of the refrigerating evaporator. If the difference between the output temperature and the temperature of the refrigerating evaporator temperature detection means in the refrigerating operation mode is within the set temperature range, the valve leakage judging means judges that the valve mechanism has refrigerant leakage to the valve of the refrigerating evaporator.

The refrigerator of the technical solution 5 of the present invention is based on the technical solution 1, and is also provided with a freezing evaporator temperature detection means for detecting the temperature of the freezing evaporator. If the difference between the output temperature and the temperature of the refrigerating evaporator temperature detection means in the refrigerating operation mode is within the set temperature range, the valve leakage judging means judges that the valve mechanism has refrigerant leakage to the valve of the refrigerating evaporator.

The refrigerator of technical solution 6 of the present invention is based on technical solution 1, and is also provided with a freezing evaporator temperature detection means for detecting the temperature of the freezing evaporator. If the difference between the output temperature and the temperature of the refrigerating evaporator temperature detecting means in the refrigerating operation mode is within the set temperature range, the valve leakage judging means judges that the valve mechanism has refrigerant leakage to the valve of the refrigerating evaporator.

The refrigerator according to claim 7 of the present invention is based on claim 1, and is further provided with a garbage removal means for forcing the valve mechanism to operate to remove garbage in the valve mechanism when the valve leakage judging means judges that the valve leaks.

The refrigerator according to claim 8 of the present invention is based on claim 7, when the valve leakage judging means determines that the valve leaks, the garbage removal means forces the valve mechanism to operate while increasing the operating frequency of the compressor.

The refrigerator of technical solution 9 of the present invention is based on technical solution 7. When the valve leakage judging means judges that the valve leaks, the garbage removal means increases the operating frequency of the compressor while switching the valve mechanism in the refrigerant flow path. process stops.

The refrigerator according to the tenth aspect of the present invention is based on the seventh aspect. When the valve leakage judging means judges that the valve leaks, the garbage removal means forces the valve mechanism to operate for a shorter time than the conventional one.

The refrigerator of the technical scheme 11 of the present invention is based on the technical scheme 10, and is also provided with a defrosting control means. Use the evaporator and refrigerating evaporator to perform defrosting operation for valve leakage.

The refrigerator of the technical scheme 12 of the present invention is based on the technical scheme 11, and the defrosting control means controls the defrosting operation interval of the evaporator for freezing under normal conditions to be shorter than the defrosting operation interval of the evaporator for refrigeration. After the defrosting operation for valve leakage, when the valve leakage judging means judges the valve leakage three times, the defrosting interval of the refrigerating evaporator and the refrigerating evaporator is set as the defrosting interval of the refrigerating evaporator.

In the case of the refrigerator of technical solution 1, the valve leakage judging means can judge the valve leakage of the valve mechanism.

In the case of the refrigerator of technical solution 2, in the freezing operation mode, once the temperature detected by the evaporator temperature detection means for refrigeration is below the set temperature, the valve leakage judgment means judges that the valve mechanism has refrigerant flow to the evaporator for refrigeration. Valve leaks.

If it is the refrigerator of technical solution 3, in the freezing operation mode, if the temperature measured by the evaporator temperature detection means is below the set temperature, and the operating frequency of the compressor is higher than the set frequency, the valve leakage judging means will judge Refrigerant leaked to the valve of the refrigerating evaporator in the valve mechanism.

If it is the refrigerator of technical solution 4, in the freezing operation mode, if the difference between the temperature measured by the evaporator temperature detection means for refrigeration and the temperature in the refrigeration operation mode is within the set temperature range, the valve leakage judgment means judges the valve mechanism Refrigerant leaked to the valve of the refrigerating evaporator.

If it is the refrigerator of technical proposal 5, in the freezing operation mode, if the difference between the temperature measured by the evaporator temperature detection means for freezing and the temperature in the refrigeration operation mode is within the set temperature range, the valve leakage judgment means judges the valve mechanism Refrigerant leaked to the valve of the refrigerating evaporator.

If it is the refrigerator of technical proposal 6, in the refrigerating operation mode, if the difference between the temperature measured by the evaporator temperature detection means for freezing and the temperature in the refrigerating operation mode is within the set temperature range, the valve leakage judging means is to judge the valve mechanism Refrigerant leaked to the valve of the refrigerating evaporator.

In the refrigerator according to claim 7, when the valve leakage judging means judges that the valve leaks, since the garbage is clogged in the valve mechanism, the garbage removing means forces the valve mechanism to operate to remove the garbage.

In the refrigerator of technical solution 8, when the valve leakage judging means judges that the valve leaks, the garbage removing means forces the valve mechanism to operate to blow off the garbage while increasing the operating frequency of the compressor.

In the refrigerator according to claim 9, when the valve leakage judging means determines that the valve leaks, the garbage removal means stops the valve mechanism during switching of the refrigerant flow path while increasing the operating frequency of the compressor to remove garbage.

In the refrigerator according to claim 10, when the valve leakage judging means judges that the valve leaks, the garbage removing means forces the valve mechanism to operate in a shorter operation time than normal to remove the garbage.

In the refrigerator according to claim 11, when the valve leakage judging means judges the valve leakage again after the valve mechanism is forced to operate by the garbage removal means, the valve leakage defrosting operation is performed to prevent the freezing evaporator and the refrigerating evaporator from frosting.

In the refrigerator according to claim 12, when the valve leakage judging means judges the valve leakage three times after the defrosting operation, the interval between the defrosting operations of the refrigerating evaporator and the refrigerating evaporator is the defrosting interval of the refrigerating evaporator , to perform a defrosting operation shorter than conventional ones.

Introduction to the accompanying drawings.

Fig. 1 is an explanatory diagram of an embodiment of the refrigerator of the present invention.

Fig. 2 is an explanatory diagram of a refrigeration cycle.

Fig. 3 is a longitudinal sectional view of the three-way valve.

Fig. 4 is an explanatory diagram of the first and fifth valve leakage detection methods.

Fig. 5 is an explanatory diagram of a second valve leakage detection method.

Fig. 6 is an explanatory diagram of a third valve leakage detection method.

Fig. 7 is an explanatory diagram of a fourth valve leakage detection method.

Fig. 8 is a flowchart showing a control state for performing a defrosting operation when a valve leak is detected.

Fig. 9 is an explanatory diagram of a modified example of the refrigeration cycle.

A refrigerator 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic vertical cross-sectional view of a refrigerator 10, which also serves as an explanatory diagram of an electrical system. In addition, FIG. 2 is an explanatory diagram of the refrigeration cycle of the refrigerator 10 .

First, it will be described based on FIG. 1 .

On the casing 12 of the refrigerator 10, a refrigerator compartment 14, a vegetable compartment 16, and a freezer compartment 18 are provided from the upper stage. An ice maker (not shown) is installed in the freezing chamber.

A machine compartment 22 in which a compressor 20 is arranged is provided at the bottom of the back of the freezer compartment 18 . In addition, a freezer evaporator (hereinafter referred to as F evaporator) 24 is arranged behind the freezer compartment 18, and a freezer compartment for sending cold air generated by the F evaporator 24 into the freezer compartment 18 is arranged above the F evaporator 24. Fan (hereinafter referred to as F fan) 26. Below the F evaporator 24, a defrost heater (hereinafter referred to as an F defrost heater) 28 for defrosting the F evaporator 24 is provided. Near the upper portion of the F evaporator 24, an F evaporator sensor 30 for detecting the temperature of the F evaporator 24 is provided.

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

The back side of the vegetable compartment 16 is provided with a refrigerator compartment evaporator (hereinafter referred to as the R evaporator) 34, and above the R evaporator 34 is provided with a refrigerator compartment fan (hereinafter referred to as the R fan) 36. R evaporator sensor 38 for evaporator 34 temperature. Below the R evaporator 34, a defrost heater (hereinafter referred to as R defrost heater) 40 for defrosting the R evaporator 34 is provided.

Inside the refrigerator compartment 14, a temperature sensor for the refrigerator compartment (hereinafter referred to as an R sensor) 42 for detecting the indoor temperature is provided.

In addition, the R fan 26, the F defrosting heater 28, the F evaporator sensor 30, the F sensor 32, the R fan 36, the R evaporator sensor 38, the R defrosting heater 40, and the R sensor 42 are controlled by a microcomputer. Device 44 is connected. The control device 44 is composed of a single substrate and is provided on the upper rear surface of the housing 12 . Furthermore, the electric motor of the compressor 20 is also connected to the control device 44 .

Next, the flow of cold air will be described based on FIG. 1 .

Cool air cooled by the F evaporator 24 is blown by the F fan 26 to circulate in the freezer compartment 18 . In addition, cold air cooled by the R evaporator 34 is blown into the vegetable compartment 16 and the refrigerator compartment 14 by the R fan 36 and circulated.

The configuration of these refrigeration cycles will be described below with reference to FIG. 2 .

A condenser 46 is connected to the compressor 20 , and a three-way valve 68 is connected to the condenser 46 . One of the two branches from the three-way valve 68 is connected to a refrigerant flow path with a refrigerating chamber capillary (hereinafter referred to as R capillary) 50 , and then connected to the R evaporator 34 . In addition, another refrigerant passage branched from the three-way valve 68 is connected to the F evaporator 24 through a capillary tube for freezing chamber (hereinafter referred to as an F capillary tube) 52 . In addition, the refrigerant passages of the F evaporator 24 and the R evaporator 34 merge into one and return to the compressor 20 .

The three-way valve 68 will be described below with reference to FIG. 3 .

FIG. 3 shows a cross-section of the three-way valve 68, and a coil 102, a magnet 104, a plunger 106, and the like constitute a so-called solenoid structure. A pin 108 is provided at the lower part of the plunger 106 , and the coil 102 is excited, and the pin 108 is driven downward, driving the valve body 110 to move downward against the spring 112 . In this state, the refrigerant flows from the condenser 46 into the R evaporator 34 . In addition, when the plunger 106 is reset, the valve body 110 returns to the upper position, and the refrigerant flows from the condenser 46 into the F evaporator 24 . In addition, in the drawings, reference numeral 116 is a valve seat for refrigeration, and reference numeral 118 is a valve seat for freezing.

Now explain the A valve leakage detection method.

With regard to the refrigerator 10 having the above configuration, a method for detecting when a valve leak occurs in the three-way valve 68 will be described.

In particular, the three-way valve 68, due to its construction, can sometimes cause microscopic debris in the refrigeration cycle to be trapped between the valve body 110 and the valve seats 116 and 118, so some valve leakage can occur. Therefore, five detection methods when this valve leakage occurs are described below.

1. The first valve leakage detection method.

The first valve leakage detection method will be described with reference to FIG. 4 .

(normal)

When the three-way valve 68 has no valve leakage and is in a normal state, when the freezer compartment 18 is cooling (hereinafter referred to as the freeze operation mode), the R evaporator sensor rises to the freezer compartment temperature (0°C-3°C). That is, in the normal freezing operation mode, all the refrigerant flows into the F evaporator 24 and does not flow into the R evaporator 34 , so the R evaporator 34 is not cooled and has the same temperature as the refrigerator compartment 14 .

(when abnormal)

However, in the freezing operation mode, once the refrigerant starts to leak into the R evaporator 34 due to valve leakage, the R evaporator 34 is also cooled by the leaked refrigerant, and the detection temperature of the R evaporator sensor 38 drops instead of rising. to refrigerator temperature.

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

(Modification)

In addition, in this judgment, when the temperature of the F evaporator sensor 38 has not reached the above-mentioned set value immediately before the end of the freezing operation mode, there may be a malfunction in which valve leakage is immediately judged.

Therefore, in order to prevent this malfunction, it may also be determined that the temperature of the R evaporator sensor 38 immediately before the end of the second freezing operation mode is below the set value, and that the temperature of the R evaporator sensor 38 immediately before the end of the third freezing operation mode is lower than the set value. When the temperature of the R evaporator sensor 38 is below the set value, it is determined that the three-way valve 68 has a valve leak.

This number of times is not limited to 3 times, but may be 2 times or 4 times.

2. The second valve leakage detection method.

The second valve leakage detection method will be described with reference to FIG. 5 .

(normal)

When the three-way valve 68 has no valve leakage and is in a normal state, there is a temperature difference of about 10-15° C. between the F evaporator sensor 30 in the freezing operation mode and the cooling operation of the refrigerator compartment 14 (hereinafter referred to as the refrigeration operation mode). That is, when the refrigerant flows into the F evaporator 24, the F evaporator 24 is cooled and its temperature drops. On the other hand, since the temperature rises unless the refrigerant flows into the F evaporator 24, the temperature difference is about 10°C to 15°C.

(when abnormal)

However, in the refrigerating operation mode, once the refrigerant starts to leak to the F evaporator 24 side, the temperature of the F evaporator 24 drops, the detected temperature of the F evaporator sensor 30 drops, and the temperature difference between the freezing operation mode and the refrigerating operation mode becomes smaller. . Therefore, when the temperature difference becomes equal to or lower than the set temperature difference, it is determined that the refrigerant has leaked into the F evaporator 24 .

(Modification)

In addition, the valve leakage detection may be the same as the first detection method, and the valve leakage is determined when the above-mentioned phenomenon occurs three times.

3. The third valve leakage detection method

The third valve leakage detection method will be described below with reference to FIG. 6 .

(normal)

Under normal conditions where there is no valve leakage in the three-way valve 68, the R evaporator sensor 38 rises to the refrigerator compartment temperature (0°C-3°C) during the freezing operation mode. That is, in the freezing operation mode, since the refrigerant does not flow into the R evaporator 34 at all, it is not cooled and is the same as the indoor temperature of the refrigerator compartment 14 .

(when abnormal)

However, in the freezing operation mode, once cold air starts to leak into the R evaporator 34, the temperature of the R evaporator 34 drops due to the cold air, so the temperature of the R evaporator sensor 38 drops and does not rise to the temperature of the refrigerator compartment 14. . In this way, when the set value is set to a temperature slightly lower than the refrigerator compartment temperature, the temperature of the R evaporator sensor 38 is lower than the set value.

In addition, the operation frequency of the compressor 20 is insufficient in capacity due to valve leakage to the R evaporator 34 , and the operation frequency is increased to compensate for the insufficiency in capacity. Therefore, when the temperature detected by the R evaporator sensor 38 is below the set value and the operating frequency of the compressor 20 is higher than the set frequency, it is determined that cool air has leaked into the R evaporator 34 . In this way, the valve leakage can be determined more reliably than the first valve leakage detection method.

(Modification)

In addition, in this valve leakage detection, similar to the first valve leakage detection method, it may be determined that the valve leakage occurs only when it occurs three times in a row.

4. The fourth valve leakage detection method.

The fourth valve leakage detection method will be described with reference to FIG. 7 .

(normal)

When the three-way valve 68 is in a normal state without valve leakage, the temperature detected by the R evaporator sensor 38 rises to the refrigerator compartment temperature (0°C-3°C) in the freezing operation mode. This is because the refrigerant does not flow into the R evaporator 34 at all, and the temperature of the R evaporator 34 rises.

(when abnormal)

In the freezing operation mode, once cold air starts to leak into the R evaporator 34, the temperature of the R evaporator 34 drops, so the detected temperature of the R evaporator sensor 38 drops and does not rise to the temperature of the refrigerator compartment. Therefore, the temperature difference between the detected temperature of the R evaporator sensor 38 in the refrigerating operation mode and the detected temperature in the freezing operation mode in the current state becomes small. Therefore, when the temperature difference becomes equal to or lower than the set temperature difference, it is determined that refrigerant leakage to the R evaporator 34 has occurred in the freezing operation mode.

(Modification)

In addition, in this valve leakage detection method, similar to the detection method described above, it may be determined that valve leakage has occurred only when it has occurred three times in succession.

5. The fifth valve leakage detection method

The fifth valve leakage detection method will be described based on FIG. 4 .

(normal)

In the normal case where no valve leakage occurs in the three-way valve 68, the detected temperature of the F evaporator sensor 30 drops to about -30° C. in the freezing operation mode. That is, since the refrigerant does not flow into the R evaporator 34 at all, and the refrigerant flows only into the F evaporator 24, the temperature drops.

(when abnormal)

Once the refrigerant starts to leak into the R evaporator 34 in the freezing operation mode, the F evaporator 24 is not completely cooled, and the detection temperature of the F evaporator sensor 30 rises. The temperature difference of the detection temperature of the pattern becomes small. Therefore, when the temperature difference becomes equal to or lower than the set temperature difference, it is detected that the refrigerant has leaked into the R evaporator 34 in the freezing operation mode.

(Modification)

In addition, in this detection method, similar to the detection method described above, it is also possible to determine that valve leakage has occurred only when it has occurred three times in succession.

Using the above valve leakage detection method, it can be reliably detected whether the three-way valve 68 has valve leakage.

B. Ways to remove garbage

Next, when it is judged that a valve leak has occurred in the three-way valve 68, a control method for removing the garbage causing the valve leak will be described.

1. The first removal method.

When the three-way valve 68 leaks, the first method of removing the rubbish is to use the solenoid to force the plunger 106 to move, thereby forcing the valve body 110 to move to remove the rubbish attached to it.

2. The second removal method.

As a second removal method, in addition to the first removal method, increase the operating frequency of the compressor 20, increase the pressure of the refrigerant flowing through the three-way valve 68, and increase the circulation amount, thereby improving The flow velocity of the refrigerant around the garbage-attached part of the valve body 110 is used to wash away the garbage. In this way, in addition to simply forcing the valve body 110 to move, the refrigerant is used to wash away the garbage, so the garbage can be reliably removed.

3. The third garbage removal method

As a third garbage removal method, when valve leakage is detected, the valve body 110 is stopped in the middle, and the refrigerant flows in two directions. In this state, the operating frequency of the compressor 20 is increased to increase the pressure and increase the circulation rate to increase the flow rate of the refrigerant around the garbage-attached portion of the valve body 110 to flush away the garbage.

4. The fourth garbage removal method

In the first and second garbage removal methods, the valve body 110 (the plunger 106) is operated for about 4 seconds, and in order to speed up the operation, the voltage is increased and the operation is performed for about 1 second. In this way, the valve body 110 moves sharply, and the impact force of the valve movement is enhanced, so that the garbage can be easily removed.

C. Control method of valve leakage defrosting.

Next, the control method of the valve leak defrosting when the trash cannot be removed even after performing the valve leak detection and the trash removal control as described above will be described based on the flow chart of FIG. 8 .

In step 1, as described above, it is detected whether or not valve leakage has occurred. Proceed to step 2 when a valve leak occurs. Return to normal operation when no valve leakage occurs.

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

In step 3, it is judged again whether valve leakage has been detected, and if no valve leakage is detected, return to normal operation, and if valve leakage is detected (that is, a total of 2 valve leakages are detected), then go to step 4.

In step 4, because 2 valve leaks are detected, the F evaporator 24 and R evaporator 34 may be overcooled and frosting occurs, so the F evaporator 24 and R evaporator 34 are defrosted, and go to step 5 .

In step 5, if valve leakage is detected again after defrosting (ie, valve leakage is detected 3 times in total), go to step 6, and return to normal operation if not detected.

In step 6, the defrosting control interval of the R evaporator 34 is switched to the defrosting interval of the F evaporator 24 because valve leakage is detected three times. This is because the defrosting interval of the R evaporator 34 is longer than the defrosting interval of the F evaporator 24 during normal operation, so frosting may occur when the defrosting interval of the F evaporator 34 is performed.

On the other hand, when this defrosting control method is viewed from a different point of view, the R evaporator 34 may be frosted more than necessary due to valve leakage. If frost formation caused by the valve leakage is judged to be frost formation during normal operation and the same defrosting control as normal operation is performed, a more defrosting operation is performed than necessary. Therefore, when such valve leakage is detected three times, the defrosting operation interval of the R evaporator 34 is changed to the defrosting operation interval of the F evaporator 24, and the detection of the valve leakage and the detection of frost formation are distinguished, and the prevention of invalidation can be obtained. Effect of defrost control.

In addition, in the refrigerator 10 of the above-mentioned embodiment, the refrigerating cycle shown in FIG. 2 has been described, but instead of the refrigerating cycle shown in FIG. 2 , as shown in FIG. 9 , the position of the F evaporator 24 is different. The refrigeration cycle can also be implemented.

As described above, according to the refrigerator of the present invention, the valve leakage can be reliably detected, and when the valve leakage occurs, the garbage causing the valve leakage can be easily removed.

Claims (12)

1. refrigerator, its with compressor, condenser, refrigeration with throttle mechanism, the refrigeration corresponding with refrigerating chamber with evaporimeter, freezingly be connected and constitute refrigerant flow path with evaporimeter with throttle mechanism and with corresponding freezing of refrigerating chamber,

Switch refrigerant flow path by valve system, can realize making cold-producing medium flow into the refrigeration operational mode of refrigeration with throttle mechanism, and make cold-producing medium only flow into freezing freezing operational mode with throttle mechanism, it is characterized in that with evaporimeter through freezing with vaporizer side through refrigeration,

Be provided with valve and leak judging means, this valve leaks judging means to be judged to freezing valve leakage with evaporimeter with the valve leakage or the cold-producing medium of evaporimeter to refrigeration the cold-producing medium in the valve system.

2. refrigerator according to claim 1 is characterized in that,

Described refrigerator also is provided with and detects the refrigeration evaporator temperature detection means of refrigeration with evaporator temperature,

In freezing operational mode, in case the temperature that refrigeration is measured with the evaporator temperature detection means below design temperature, described valve leaks judging means judges that promptly valve system has cold-producing medium to the valve leakage of refrigeration with evaporimeter.

3. refrigerator according to claim 1 is characterized in that,

Described refrigerator also is provided with and detects the refrigeration evaporator temperature detection means of refrigeration with evaporator temperature,

In freezing operational mode, the temperature of measuring with the evaporator temperature detection means when refrigeration is below design temperature, and when the operating frequency of compressor was higher than setpoint frequency, described valve leaks judging means judged that promptly valve system has cold-producing medium to leak to the valve of refrigeration with evaporimeter.

4. refrigerator according to claim 1 is characterized in that,

Described refrigerator also is provided with and detects the refrigeration evaporator temperature detection means of refrigeration with evaporator temperature,

In freezing operational mode, in case in the design temperature scope, described valve leaks judging means judges that promptly valve system has cold-producing medium to refrigerating the valve leakage of using evaporimeter with the difference of the temperature of evaporator temperature detection means when the refrigeration operational mode for the temperature that refrigeration is measured with the evaporator temperature detection means and this refrigeration.

5. refrigerator according to claim 1 is characterized in that,

Described refrigerator also is provided with and detects the freezing freezing evaporator temperature detection means of using with evaporator temperature,

In freezing operational mode, when the freezing temperature of measuring with the evaporator temperature detection means with should be freezing with the evaporator temperature detection means when difference of the temperature during in the refrigeration operational mode is in the design temperature scope, described valve leaks judging means judges that promptly valve system has cold-producing medium to the valve leakage of refrigeration with evaporimeter.

6. refrigerator according to claim 1 is characterized in that,

Described refrigerator also is provided with and detects the freezing freezing evaporator temperature detection means of using with evaporator temperature,

In freezing operational mode, if the freezing temperature of measuring with the evaporator temperature detection means with should be freezing with difference of the temperature of evaporator temperature detection means when the refrigeration operational mode in the design temperature scope, described valve leaks judging means judges that promptly valve system has cold-producing medium to the freezing valve leakage of using evaporimeter.

7. refrigerator according to claim 1 is characterized in that,

Also be provided with when valve leaks judging means and be judged as valve when leaking, force valve system to move to remove the rubbish of rubbish in the valve system to remove means.

8. refrigerator according to claim 7 is characterized in that,

When valve leakage judging means was judged as the valve leakage, described rubbish was removed the operating frequency rising that the means limit makes compressor, and the limit forces the valve system action.

9. refrigerator according to claim 7 is characterized in that,

When valve leakage judging means was judged as the valve leakage, described rubbish was removed the operating frequency rising that the means limit makes compressor, the Halfway Stopping that the limit makes valve system switch in refrigerant flow path.

10. refrigerator according to claim 7 is characterized in that,

When valve leakage judging means was judged as the valve leakage, described rubbish removal means forced valve system with the time action shorter than the actuation time of routine.

11. refrigerator according to claim 10 is characterized in that,

Also be provided with the defrosting control device, remove after the rubbish valve when described rubbish removal means and leak judging means and be judged as valve once more when leaking, this defrosting control device is carried out valve with evaporimeter and refrigeration with evaporimeter and is leaked with defrosting and turn round freezing.

12. refrigerator according to claim 11 is characterized in that,

Described defrosting control device is controlled to be freezing defrosting running with evaporimeter under the conventional state shorter at interval with the defrosting running of evaporimeter than refrigeration at interval,

When carrying out after valve leaks with the defrosting running, valve leaks judging means when judging valve once more and leaking, and makes freezingly to become the freezing defrost interval of using evaporimeter with evaporimeter and refrigeration with the defrosting running interval of evaporimeter.

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