CN1121599C - Refrigerator and method for controlling temp. in refrigerator - Google Patents

Abstract

The present invention cools refrigerating and freezing sections individually by supplying all refrigerant to a refrigeration evaporator at the time of cooling the refrigerating chamber and supplying all refrigerant to a freezing chamber at the time of cooling the freezing chamber even if a valve for switching a refrigerant channel leaks. Throttling of a refrigeration capillary tube is set looser than that of a freezing capillary tube. If the freezing capillary tube side coupled with a freezing evaporator leaks when a refrigerant channel is switched to a channel coupled with a refrigerating evaporator by means of a three-way valve in order to cool the refrigerating chamber, refrigerant does not flow smoothly to the freezing capillary tube side but flows smoothly to the refrigerating evaporator side because the freezing capillary tube is throttled more than the refrigeration capillary tube.

Description

Refrigerator and refrigerator control method

The present invention relates to a refrigerator having an evaporator for refrigeration and an evaporator for freezing and a control method for the refrigerator.

In such a refrigerator having a refrigerating evaporator for cooling the refrigerating chamber or a plurality of interiors to the refrigerating temperature zone and a freezing evaporator for cooling the freezing chamber, a three-way valve is installed in the refrigerant flow path, to switch the flow path. One output side of the three-way valve is connected to a refrigeration evaporator through a refrigeration capillary, and the other output side is connected to a freezing evaporator through a freezing capillary.

It is difficult to completely eliminate leakage in the structure of the three-way valve for switching the refrigerant flow path. Therefore, when the three-way valve is switched so that the refrigerant flows only in the refrigerating evaporator, there is a problem that the refrigerant also flows in the refrigerating evaporator due to leakage of the three-way valve, resulting in a loss.

In addition, even when the refrigerant flows through the refrigerating evaporator, due to the leakage in the three-way valve, the refrigerant flows through the capillary tube side for freezing, but all the refrigerant does not flow through the refrigerating evaporator, and there is still a problem. The problem of loss due to leakage of the three-way valve.

Therefore, in view of the above-mentioned problems, the present invention provides a refrigerator and a refrigerator control method for cooling each zone of refrigeration and freezing separately, so that even if a leak occurs in the valve for switching the refrigerant flow path, the refrigerator compartment can be cooled. When cooling the evaporator, all the refrigerant may flow through the evaporator for refrigeration, and all the refrigerant may flow through the freezer compartment when cooling the freezer compartment.

The refrigerator according to technical solution 1 of the present invention comprises a compressor, a condenser, a throttle mechanism for refrigeration, an evaporator for refrigeration corresponding to a plurality of refrigerator compartments, a throttling mechanism for freezing, and an evaporator for refrigeration corresponding to the freezer compartment They are annularly connected to form a refrigerant flow path, and the refrigerant flow path is switched by using a valve mechanism, and the refrigerating evaporator and the freezing evaporator are communicated through the refrigerating throttling mechanism to circulate the refrigerant, or the refrigerating throttling mechanism is used to communicate the refrigerant. The feature of allowing the refrigerant to flow through the evaporator for freezing is that the throttling mechanism for freezing has a larger flow path resistance than the throttling mechanism for refrigeration.

The control method of the refrigerator of technical proposal 2 comprises a compressor, a condenser, a throttling mechanism for refrigeration, an evaporator for refrigeration corresponding to a plurality of refrigerator compartments, a throttling mechanism for freezing, and a throttle mechanism for freezing corresponding to the freezer compartments. The evaporators are connected in a ring to form a refrigerant flow path, and the refrigerant flow path is switched by using a valve mechanism, and the refrigerating evaporator and the freezing evaporator are communicated through the refrigerating throttling mechanism to circulate the refrigerant, or the refrigerating throttling mechanism is used to communicate the refrigerant. In a refrigerator in which only the refrigerant is circulated through the evaporator for freezing, the characteristic is that a temperature sensor is arranged at the inlet of the evaporator for refrigeration, and the temperature sensor is used to measure the temperature of the inlet of the evaporator for refrigeration when the refrigerator room is not cooled. , when the measured temperature does not rise above a certain temperature, the valve mechanism is operated to the opposite side, and then the valve mechanism is closed more than once.

The refrigerator control method of technical proposal 3, in technical proposal 2, is characterized in that there is a blower for refrigeration at the evaporator for refrigeration, and when the blower for refrigeration continues to operate for a certain period of time after the cooling of the refrigerator compartment is completed, the air blower for refrigeration is provided at the evaporator for refrigeration. When the temperature at the inlet of the refrigerating evaporator after the blower operation is completed is lower than the temperature during the operation of the refrigeration blower or when the temperature has not risen above a certain level, the valve mechanism is operated to the opposite side for a certain period of time, and then closed more than once. Action of the valve mechanism.

The refrigerator control method of claim 4, in claim 2, is characterized in that the temperature at the inlet of the refrigerating evaporator is measured when the refrigerating room is not being cooled, and when the measured temperature does not rise above a certain temperature, and When the refrigerating blower continues to operate for a certain period of time after the cooling of the refrigerating room is completed, or when the inlet temperature is lower than the temperature of the refrigerating blower after the refrigerating blower is operating or does not rise above a certain temperature, use The heater defrosts until the temperature of the refrigerating evaporator rises above a certain temperature or the refrigerating room is to be cooled.

The refrigerator control method of claim 5, in claim 4, is characterized in that the operation of the compressor is stopped when the heater is used for defrosting.

The method for controlling a refrigerator according to Claim 6, in Claim 2 or 4, is characterized in that a temperature sensor is provided to measure the temperatures of both the inlet and the outlet of the refrigerating evaporator.

The method for controlling a refrigerator according to claim 7, in claim 6, is characterized in that a member to which a temperature sensor is attached is provided in contact with both the inlet and the outlet, and the temperature sensor is attached to the member.

The control method of the refrigerator of technical proposal 8 is to combine the compressor, the condenser, the throttling mechanism for refrigeration, the evaporator for refrigeration corresponding to a plurality of refrigerator compartments, the throttling mechanism for freezing, and the throttle mechanism for freezing corresponding to the freezer compartments. The evaporators are connected in a ring to form a refrigerant flow path, and the refrigerant flow path is switched by using a valve mechanism, and the refrigerating evaporator and the freezing evaporator are communicated through the refrigerating throttling mechanism to circulate the refrigerant, or the refrigerating throttling mechanism is used to communicate the refrigerant. In a refrigerator in which the refrigerant flows only through the evaporator for freezing, the characteristic is that a temperature sensor is arranged at the inlet of the evaporator for refrigeration, and when only the refrigerant flows through the evaporator for freezing, the When the detected temperature does not reach the reference temperature or higher, it is determined that the valve mechanism is abnormal, and the defrosting heater for the refrigerating evaporator is energized while switching to a state where the refrigerant flows only in the refrigerating evaporator.

The method for controlling a refrigerator according to Claim 9, in Claim 8, is characterized in that when the cycle in which the refrigerant alternately flows through the refrigerating evaporator and the freezing evaporator is continued for several cycles and the defrosting heater is turned on , stop the compressor to defrost.

The refrigerator control method of claim 10, in claim 8 or 9, is characterized in that when it is judged that the valve mechanism is abnormal, an alarm device is used to report.

The method for controlling a refrigerator according to Claim 11, in Claim 8 or 9, is characterized in that when the defrosting heater is energized for several cycles, an alarm device is used to report.

The method for controlling a refrigerator according to Claim 12, in Claim 8, is characterized in that when the cycle in which the refrigerant alternately flows through the refrigerating evaporator and the freezing evaporator is continued for several cycles and the defrosting heater is energized , Stop the operation of the compressor for defrosting, and when the temperature detected by the temperature sensor is below 0°C, an alarm device will be used to report.

In the refrigerator of technical proposal 1, since the flow path resistance of the throttling mechanism for freezing is set larger than that of the throttling mechanism for refrigeration, even if the valve mechanism leaks, it can flow through the evaporator for refrigeration when cooling the refrigerator compartment. All the refrigerants can be circulated in the freezer when cooling the freezer.

According to the refrigerator control method of claim 2, by performing the operation of closing the valve mechanism more than once, the garbage in the valve mechanism can be removed and the valve leakage can be prevented.

In addition, since the defrosting is performed according to the temperature detected by the temperature sensor to prevent malfunctions caused by valve leakage, or the compressor is stopped in the case of defrosting with a heater, the defrosting can be reliably performed. In addition, since temperature sensors are provided at the inlet and outlet of the refrigerating evaporator to measure the temperatures of both the inlet and the outlet, it is possible to detect valve leakage and detect the completion of defrosting.

According to the refrigerator control method of claim 8, although ice particles are likely to be generated when the refrigerant leaks from the refrigerating evaporator, since the defrosting heater for the refrigerating evaporator is energized, it is possible to prevent damage due to ice particles. Surrounding parts, etc., can prevent unnecessary repairs.

In addition, in specified occasions, if the valve mechanism is abnormal, the alarm device can be used to report, so the failure of the valve mechanism can be detected early to prevent the growth of icing, and the failure can be reported to the user in order to restore normal functions.

Fig. 1 is a block diagram of an embodiment of the present invention combined with a refrigerant flow path.

FIG. 2 is an explanatory diagram showing a control method.

FIG. 3 is an explanatory diagram showing another control method.

FIG. 4 is an explanatory diagram showing still another control method.

Fig. 5 is a sectional view of a three-way valve.

Fig. 6 is an exploded perspective view of a case where a temperature sensor is attached to a capillary for refrigeration.

Fig. 7 is an explanatory diagram of a case where a temperature sensor is attached to a capillary tube for refrigeration.

Fig. 8 is a longitudinal sectional view of the refrigerator 10 according to the present embodiment seen from the front.

Fig. 9 is a longitudinal sectional view seen from the side.

Fig. 10 is a layout diagram of devices constituting a refrigeration cycle.

first embodiment

Embodiments of the present invention will be described below with reference to FIGS. 1 to 10 .

First, the overall structure of the refrigerator of the present invention will be described with reference to FIGS. 8 and 9 . FIG. 8 is a longitudinal sectional view seen from the front of refrigerator 10 of this embodiment, and FIG. 9 is a longitudinal sectional view seen from the side.

On the casing 12 which is the main body of the refrigerator 10, a refrigerator compartment 14, a vegetable compartment 16, a temperature switching compartment 18, and a freezer compartment 22 are provided from the upper stage. In addition, an ice making compartment 20 is provided on the left side of the temperature switching compartment 18 . On the other hand, a heat insulator 24 is arranged between the vegetable compartment 16 , the temperature switching compartment 18 , and the ice making compartment 20 .

Refrigerating compartment 14 is provided with refrigerating compartment door 14a that opens and closes with a hinge. On the other hand, in the lower part of the refrigerator compartment 14, a cooling compartment 26 for maintaining the indoor temperature at approximately 0° C. is provided.

The vegetable compartment 16 is provided with a pull-out type vegetable compartment door 16a, and the vegetable container 28 can be pulled out together with the door. The vegetable container 28 is covered with a fresh-keeping cover (crispakaba-) 29 .

A pull-out temperature switching chamber door 18 a is provided on the temperature switching chamber 18 , and the temperature switching chamber container 30 can be pulled out together with the door.

The freezer compartment 22 is also provided with a pull-out freezer door 22a, and the freezer container 32 can be pulled out together with the door.

As shown in FIG. 9 , an ice making device 34 is provided near the top of the ice making compartment 20 , and an ice storage container 36 is provided below it.

The ice making device 34 includes an ice making container 38 , a driving part 40 for rotating it, and an ice detection rod 42 for detecting the amount of ice in the ice storage container 36 . In addition, a water storage tank 44 for supplying water to the ice maker 38 is provided on the left side of the cooling chamber 26 .

Next, the configuration and arrangement of the refrigeration cycle of refrigerator 10 will be described.

First, as shown in FIG. 9 , the compressor 46 is provided at the bottom of the casing 12 , that is, in the machine room 48 provided at the lower rear portion of the freezer compartment 22 .

The refrigerator 10 has two evaporators for refrigeration and freezing. Also, a cooling air blower 54 is provided above the refrigeration evaporator 50 , and a freezing air blower 56 is provided above the freezing evaporator 52 . A defrosting heater 96 is provided below the refrigerating evaporator 50 , and a defrosting heater 98 is provided below the freezing evaporator 52 .

And the left side wall and the bottom plate of the temperature switching chamber 18 form a thermal insulation structure. In this way, even if the indoor temperature of temperature switching chamber 18 is set to the same temperature as that of the refrigerator compartment, it will not be affected by the temperature of freezer compartment 22 and the like that exist around. In addition, since the back panel of the temperature switching chamber 18 is also insulated, it is not affected by the temperature of the evaporator 52 for freezing.

Fig. 10 schematically describes the arrangement of the refrigeration cycle apparatus, and Fig. 1 shows a block diagram showing the refrigerant flow path thereof. Next, the flow of the refrigerant will be described with reference to FIG. 10 and FIG. 1 .

The refrigerant flowing out from the compressor 46 reaches the three-way valve 68 through the muffler 58 , the cooling pipe 60 , the condenser 62 , the anti-dew pipe 64 , and the drier 66 . In the three-way valve 68 , the refrigerant flow path is branched, and one side leads to the capillary tube 70 for refrigeration, and the other side leads to the capillary tube 72 for freezing. From the refrigerating capillary 70 to the evaporator 50 for refrigerating, merge with the outlet side of the capillary 72 for freezing, and then reach the evaporator 52 for freezing. Then, it returns to the compressor 46 through the accumulator 74 and the suction pipe 76 .

Here, the mounting positions of the refrigerator 10 of each device not described above will be described.

As shown in FIG. 10 , condenser 62 is folded multiple times to form a plate shape, and is arranged below the bottom of freezer compartment 22 as shown in FIG. 9 . In addition, the accumulator 74 is attached to the right side of the refrigerating evaporator 52 .

Next, with reference to FIG. 9 of the refrigerator 10, the flow of cold air in the refrigeration cycle with the above-mentioned structure will be described.

First, the flow of cold air cooled by the refrigerating evaporator 50 will be described.

The cold air cooled by the refrigerating evaporator 50 is sent from the front side of the refrigerating blower 54 into the refrigerating branch space 78 located behind the vegetable compartment 16 . The upper part of the refrigerated branch space 78 is connected to the refrigerated duct 80 provided at the back of the refrigerated compartment 14 , so that cold air is sent to the refrigerated duct 80 . As shown in FIG. 8 , the refrigerating pipeline 80 is divided into two strands at the lower part of the refrigerating chamber 14 , and is roughly U-shaped. Air outlets 82 for blowing out cold air at predetermined intervals are provided in front of refrigeration duct 80 , and cold air is blown into refrigerator compartment 14 through these air outlets 82 . The cold air that cools the refrigerator compartment 14 passes through the cooling chamber 26 and the bottom of the water storage tank 44 (refer to FIG. 9 ) and flows into the return air duct 84 that is arranged on the left and right sides of the refrigeration blower 54 and the refrigerator evaporator 50, and flows to the refrigerator evaporator 50. Blow out from below. Then, the cold air is further cooled by the refrigerating evaporator 50 and reaches the position of the refrigerating air blower 54 .

Moreover, cold air cools the vegetable compartment 16 along the fresh-keeping cover 29 of the vegetable compartment 16 from the refrigeration branch space 78 (refer FIG. 9). This cool air flows from front to back at the bottom of vegetable container 28 , reaches return air opening 88 , and circulates in refrigerating evaporator 50 .

Next, the flow of the cold air cooled by the refrigerating evaporator 52 will be described.

The cold air cooled by the freezing evaporator 52 reaches the freezing branch space 90 . The upper part of the freezing branch space 90 communicates with the ice making device 34 , and cold air is blown out to the ice making device 34 from the upper part. In addition, the lower part of the freezing branch space 90 communicates with the hole 33 opened on the back panel of the freezing container 32 of the freezing compartment 22 and the upper surface of the freezing container 32, so that cold air is blown into the freezing container 32 from the lower part.

The cool air which cooled ice making compartment 20 flows in front of freezer compartment 22 , and the cool air which cooled the inside of freezer container 32 in freezer compartment 22 flows in front of freezer compartment 22 . Then, the cold air flows downward along the front surface of the freezing container 32 , passes through the bottom, and reaches the return air duct 92 . The cool air flowing into the return air duct 92 circulates through the refrigerating evaporator 52 .

As shown in Figure 5, on the right side of the freezing branch space 90, there is provided a damper device 94 for sending cold air to the temperature switching chamber 18. 18 to adjust the air-conditioning capacity, thereby adjusting the indoor temperature. The cold air after cooling the temperature switching chamber 18 flows from the bottom of the temperature switching chamber 18 into the return air duct 95 communicating with the refrigerating evaporator 52 to circulate in the refrigerating evaporator 52 .

5 shows a cross-sectional view of the three-way valve 68, which has a so-called electromagnet structure composed of a coil 102, a magnet 104, a plunger 106, and the like. A pin 108 is provided at the lower part of the plunger 106 , and the pin 108 is driven downward by exciting the coil 102 , and the valve body 110 is driven downward against the elastic force of the spring 112 . In this state, the refrigerant flows from the drier side to the refrigeration evaporator (Reeva) side. In addition, when the plunger 106 returns, the valve body 110 returns upward, and the refrigerant flows from the dryer side to the refrigerating evaporator (Feva) side. In the figure, 116 is a valve seat for refrigeration, and 118 is a valve seat for freezing.

For the three-way valve 68 for switching the refrigerant flow path, due to its structure and the fact that tiny garbage in the refrigeration cycle is caught between the valve body 110 and the valve seats 116, 118, there is a certain degree of inconsistency. Leakage.

Therefore, in this embodiment, the difference in throttle amount of the refrigerant in the capillary tube 70 for refrigeration and the capillary tube 72 for freezing interposed in the refrigerant flow path shown in FIG. 1 is set in advance.

That is, by setting the throttling amount of the capillary tube 70 for refrigeration connected to the evaporator 50 for refrigeration to be looser than the capillary amount for freezing 72 connected to the evaporator 52 for freezing, when it is desired to cool the refrigerator compartment 14 The refrigerant can be made to flow through the refrigerating evaporator 50, or the refrigerant can be made to flow through the freezing evaporator 52 when the freezing compartment 22 is to be cooled.

For example, in order to cool the refrigerator compartment 14, when the refrigerant flow path is switched to the flow path connected to the refrigerating evaporator 50 by the three-way valve 68, the capillary tube 72 side for freezing connected to the evaporator 52 for freezing When leakage occurs, since the capillary tube 72 for freezing is more tightly throttled than the capillary tube 70 for refrigeration, it is difficult for the refrigerant to flow toward the capillary tube 72 for freezing, and the refrigerant flows toward the evaporator 50 for refrigeration.

Conversely, in order to cool the freezer compartment 22, when the refrigerant flow path is switched to the flow path connected to the evaporator 52 for freezing by the three-way valve 68, on the side of the capillary tube 70 for refrigeration connected to the evaporator 50 for refrigeration, In the case of leakage, since the throttling amount of the capillary tube 70 for refrigeration is looser than that of the capillary tube 72 for freezing, although the refrigerant flows to the evaporator 50 for refrigeration, the refrigerant does not flow in the refrigerator because the air blower 54 for refrigeration stops operating. The heat exchange is performed in the evaporator 50 , and the refrigerant passing through the capillary tube 72 for freezing directly connected to the freezing compartment 22 merges with the refrigerant, and evaporates and exchanges heat in the evaporator 52 for freezing.

In this way, in the present embodiment, even if the three-way valve 68 leaks, when the refrigerator compartment is cooled and when the freezer compartment is cooled, most of them can flow through the refrigerating evaporator 50 and the freezing evaporator 52, respectively. Refrigerants can be used to cool the refrigerated and frozen areas separately, thereby preventing loss.

2nd embodiment

As described in the previous embodiment (see FIG. 1 ), the refrigerant flowing in the evaporator 52 for freezing may flow in both through the capillary tube 70 for refrigeration and the capillary tube 72 for freezing. At this time, the refrigerant flowing in the refrigerating evaporator 52 passes through the two capillary tubes 70, 72. Compared with the case where the refrigerant flows only through the refrigerating capillary tube 72 and flows into the refrigerating evaporator 52, the throttling is relatively loose, and the refrigeration The evaporation temperature of the agent may increase with its leakage.

In this case, although the temperature of the refrigerating evaporator 50 should rise above about 0° C. during the original cooling, it can be detected because it is lower than that. As a kind of possibility that the three-way valve 68 leaks, the following situation can be considered: when the valve body 110 is moved and pressed on the valve seats 116, 118, the garbage in the refrigeration cycle is embedded therebetween, and the valve body 110 and the valve A gap is created between the seats 116,118.

At this time, the valve body 110 is opened for a certain period of time, such as 10 seconds, so that the refrigerant flows between the valve body 110 and the valve seats 116, 118, and the valve body 110 is moved after washing away the garbage, and pressed against the valve seats 116, 118 On, it can improve its tightness. This control can be performed by the control unit 120 shown in FIG. 1 . In addition, this action can also be repeated several times (2 to 3 times).

3rd embodiment

And when switching from the refrigerating room cooling state to the non-cooling state, under the situation of making the refrigerating blower 54 continue to run for a certain period of time (for example, 5 minutes), the refrigerating evaporator 50 is heated by the air in the refrigerating room 14 and rises to 0. around ℃.

However, when leakage occurs on the side of the refrigeration capillary tube 70 connected to the refrigeration evaporator 50, the temperature of the refrigeration evaporator 50 drops when the operation of the refrigeration blower 54 is stopped. In this case, valve leakage is eliminated by moving the valve body 110 as in the first embodiment.

4th embodiment

Similar to the previous second and third embodiments, when a valve leak is detected in the refrigerating evaporator 50, there is a possibility that the frost formed on the refrigerating evaporator 50 cannot be removed. In this case, the defrosting heater 96 of the refrigerating evaporator 50 is energized, and the control unit 120 performs defrosting until the temperature of the evaporator rises to a certain temperature (for example, 12° C.).

fifth embodiment

In the fourth embodiment, when defrosting the refrigerating evaporator 50, the defrosting should be performed after the compressor 46 is stopped in order to reliably perform the defrosting.

sixth embodiment

Next, the sixth embodiment will be described. Generally, when defrosting is performed, since the outlet temperature of the refrigerating evaporator 50 rises relatively slowly, it is necessary to detect the temperature in order to detect the end of defrosting. Therefore, the temperature sensors 122 and 124 are provided in a structure capable of detecting the temperatures of both the inlet pipe and the outlet pipe of the refrigerating evaporator 50 as shown in FIG. 1 . Based on the outputs of the temperature sensors 122 and 124, both detection of valve leakage and completion of defrosting can be performed.

Seventh embodiment

In the seventh embodiment, a member connecting the inlet pipe and the outlet pipe of the refrigerating evaporator 50 is installed, and by installing a temperature sensor on the member, the temperature of both the inlet pipe and the outlet pipe can be measured.

Eighth embodiment

Although the system in the refrigerator room was not specially designed to deal with valve leakage technically, in the design stage of the valve (three-way valve 68) itself, in order to suppress the same failure rate as the compressor 46 which is the main part of the refrigerator, long-term reliability is also carried out. performance test to become a sufficiently durable structure for the main parts of the refrigerator to obtain a long product life.

However, if the three-way valve 68 malfunctions and the refrigerant flows through the refrigerating evaporator 50, ice will form at the inlet of the refrigerating evaporator 50, and once the ice grows, there is a risk of damage to nearby parts. This situation cannot be found before the function is hindered, and more parts need to be replaced during repair.

Therefore, in the following embodiments, an embodiment of early detection of valve faults will be described.

As shown in FIG. 1 , when the refrigerant flows in the refrigerating evaporator 52, the refrigerant does not flow in the refrigerating evaporator 50, and by operating the refrigerating blower 54, the refrigerating evaporator 50 becomes a positive temperature. , natural defrosting becomes possible.

However, if the refrigerant leaks from the refrigerating evaporator 50 for some reason, the inlet of the refrigerating evaporator 50 is cooled, and the surrounding water vapor is concentrated to form ice, and ice particles are generated at the inlet of the refrigerating evaporator 50. . The ice particles grow, and it doesn't take long to damage surrounding parts and the inner box. Once this happens, considerable repair costs and time will be spent.

Therefore, the temperature sensor 122 as a defrosting sensor attached to the inlet of the refrigerating evaporator 50 detects the temperature at the inlet of the refrigerating evaporator 50 , and the refrigerating evaporator 50 is defrosted based on the output of the temperature sensor 122 . Frost.

6 and 7 show the installation method of the temperature sensor 122. The temperature sensor 122 is press-fitted and fixed into the aluminum or copper fixing member 126 with a substantially U-shaped cross section. On one end side of the fixing member 126, a locking portion 128 is integrally formed along the longitudinal direction. By wrapping and fixing the capillary tube 70 for refrigeration in the locking portion 128, the temperature sensor 122 is attached to the capillary tube for refrigeration via the fixing member 126. 70 side.

In addition, the temperature sensor 122 can also be installed and fixed on the capillary tube 70 for refrigeration with an aluminum strip.

Here, the temperature at the inlet of the refrigerating evaporator 50 is monitored by the temperature sensor 122 from the moment when the refrigerant starts flowing in the refrigerating evaporator 52, and if the detected temperature is, for example, 0° C. or higher, it is determined that the three-way valve 68 is malfunctioning. . And, as shown in FIG. 1 , the warning lamp 130 is turned on or blinked by the control unit 120 to notify the user. Fig. 2 shows this state. In FIG. 2 , point A is the time when the alarm light 130 is used to report.

9th embodiment

In the ninth embodiment, after the failure of the three-way valve 68 is judged in the eighth embodiment, the defrosting heating is performed from the moment when the refrigerant is switched to flow in the refrigerating evaporator 52 (point B in FIG. 2 ). The evaporator 96 is energized to prevent the inlet of the refrigerating evaporator 50 from freezing.

Then, when the flow of the refrigerant is switched to the refrigerating evaporator 50, or when the compressor 46 is in any state of being stopped, the energization of the defrosting heater 96 is stopped.

10th embodiment

In the previous ninth embodiment, the circulation of refrigerant flowing alternately in the refrigerating evaporator 50 and the freezing evaporator 52 is as shown in FIG. If it is judged that the frozen growth cannot be melted, when switching to the next refrigerating evaporator 50 (point A in FIG. 3 ), the operation of the compressor 46 is forcibly stopped, and the defrosting heater 96 performs defrosting.

In addition, the alarm light 130 is also used for notification in this case.

11th embodiment

In the eleventh embodiment, in the tenth embodiment, the temperature detected by the temperature sensor 122 does not reach 0° C. Down (point A in FIG. 4 ), report with the warning light 130 .

In addition, LEDs (Light Emitting Diodes) are provided on the front of the refrigerator door or on the temperature adjustment panel in the room to light up or blink. Also, for refrigerators without LEDs, a buzzer sounds when the door is opened, and an abnormality is reported to the user by sound.

According to the refrigerator of the present invention as described above, by setting the difference in throttling of the refrigerant flow path connected to the three-way valve, even in the case of valve leakage, when cooling the refrigerating chamber, the refrigerating evaporator can be cooled. Flow all the refrigerant, flow all the refrigerant in the freezer when cooling the freezer, bypass the refrigerator when cooling the refrigerator, and prevent the loss of refrigerant flowing in the evaporator for freezing . As a result, the refrigerant can flow in the refrigerating evaporator when the refrigerating compartment is cooling, and the refrigerant can flow in the freezing evaporator when the freezing compartment is cooling, and each area of refrigerating and freezing can be reliably refrigerated. cool down.

In addition, when there is no cooling in the refrigerating room, when the refrigerant flows in the refrigerating evaporator, the valve is opened and closed. Undesirable conditions caused by frost.

In addition, by detecting the bad condition of the three-way valve early by the temperature sensor, it is possible to prevent the growth of icing and report the failure to the user in order to restore the normal function. The situation that cannot be found before the obstacle, and the phenomenon that more parts need to be replaced during repair.

Claims (1)

1. refrigerator, with compressor, condenser, refrigeration with throttle mechanism, with the corresponding refrigeration of a plurality of refrigerating chambers with evaporimeter, freezing with throttle mechanism with use with the corresponding cryogenic temperature band of refrigerating chamber freezingly give ring-type with evaporimeter and be connected and constitute refrigerant flow path

Utilize valve system switch refrigerant flow path and by refrigeration with throttle mechanism make refrigeration with evaporimeter with freezing with the evaporimeter cold-producing medium that circulates that communicates, or freezingly it is characterized in that with the cold-producing medium that circulates in the evaporimeter by freezing only making with throttle mechanism,

The freezing flow path resistance that refrigerates with throttle mechanism with throttle mechanism is provided with greatly.

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