KR100691587B1 - Refrigerator - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to perform cooling operation with high efficiency by reducing cooling loss due to refrigerant delay during channel switching during operation switching from a refrigeration side circuit to a refrigeration side circuit by a refrigerant flow path switching device such as a three-way valve. At the same time, it is to provide a refrigerator in which the refrigerant to each cooler for freezing and refrigerating flows in a balanced manner to prevent the occurrence of noise.

Coolers 7 and 9 and cold air circulation fans 8 and 10 for exclusively cooling the freezing and refrigerating spaces are provided, and the flow path switching valve 14 alternately switches the coolant flow path to the freezing / refrigerating cooler for cooling. At the same time, when the refrigerant flow path is switched from the freezing cooler 7 to the refrigerating cooler 9, the refrigerator which performs the refrigeration cooling mode operation after the simultaneous cooling mode operation of both coolers at the time of the simultaneous cooling mode operation. When the temperature difference between the refrigerant inlet and outlet portions of the refrigerating cooler is less than or equal to a predetermined value, the flow path resistance to the refrigerating cooler is increased.

Cooler, Euro selector valve, Three way valve, Refrigerator, Euro selector

Description

Refrigerator {REFRIGERATOR}

1 is an operation control timing chart of a refrigerator showing one embodiment of the present invention;

Figure 2 is a longitudinal sectional view showing a typical refrigerator.

Figure 3 is a schematic diagram of a refrigeration cycle showing the state of simultaneous cooling mode of the present invention.

4 is a schematic diagram of a refrigeration cycle showing the refrigerated cooling mode of FIG.

5 is a schematic diagram of a refrigeration cycle showing the refrigeration cooling mode of FIG.

6 is a schematic view of a refrigeration cycle of a refrigerator showing another embodiment of FIG.

FIG. 7 is a refrigeration cycle diagram showing a pumpdown operation after the simultaneous cooling mode of FIG. 3; FIG.

8 is a schematic view showing a refrigerating cycle of a conventional refrigerator.

9 is an operation control timing chart of a conventional refrigerator.

<Explanation of symbols for the main parts of the drawings>

1: refrigerator body

2: cold storage room

3: vegetable room

4: freezer

5: automatic ice making room

6: door

7: chiller for refrigeration

8, 10: cooling fan

9: chiller for refrigeration

11: machine room

12: compressor

13: condenser

14: three way valve

15: first throttling device

16: second throttle device

17: Accumulator

18: check valve

19: heat dissipation fan

20: refrigeration cycle

21: refrigeration side circuit

22: freezing circuit

23: inlet temperature sensor

24: exit temperature sensor

25: refrigerant control valve

[Document 1] Japanese Unexamined Patent Publication No. 2002-267312

The present invention relates to a refrigerator provided with a cooler for cooling the freezing storage space and the refrigerating storage space exclusively and a fan for circulating cold air, and alternately cooling the freezing and refrigerating storage space by a flow path switching valve.

In the conventional refrigerator, as shown in the refrigeration cycle in Fig. 8, the compressor 12 which compresses and discharges the refrigerant is used, which has a variable capacity, and thus the refrigerant flow path switching composed of the condenser 13 and the three-way valve 14 is used. The device and the first throttling device 15 and the refrigeration cooler 9 are connected, and the second throttling device 16 and the refrigeration cooler in parallel with the first throttling device 15 and the refrigeration cooler 9 ( 7), the accumulator 17 and the check valve 18 are connected to form a refrigeration cycle 20.

The refrigerating side circuit 21 of the first throttle device 15 and the refrigerating cooler 9 by the flow path switching device 14 by the detection temperature of the temperature sensor which detects the room temperature of the refrigerating chamber and the freezing chamber, The refrigerant flow paths are alternately operated by switching between the second throttling device 16, the freezing cooler 7, the accumulator 17, and the check valve 18, and the refrigerant flow paths. By the rotation of the cold air circulation fan arranged in the vicinity of 9), each of the refrigerator compartment space and the freezer compartment space is independently controlled for cooling, and the cooling operation switching from the refrigeration side circuit 22 to the refrigeration side circuit 21 is performed. In the cooler by a so-called pumpdown operation in which the compressor 12 is operated in a state where the three-way valve 14 is shut off so that the refrigerant does not flow to the refrigerating side circuit 21 or the freezing side circuit 22 at a certain time. To absorb the refrigerant To and secured to the refrigerant circulation amount refrigeration cooler (9) and to then flow the refrigerant to the refrigeration circuit (21) to cool the refrigerated space.

According to this pump-down operation, the refrigerant remaining in the cooler 7 on the low pressure side is sucked from the three-way valve 14 and forcibly moved to the condenser 13 on the high pressure side. Since the coolant is supplied to the cooler 9, the amount of refrigerant circulating is maintained, thereby improving the cooling efficiency of the refrigerating space.

In addition, as shown in Fig. 9 described in Patent Document 1 relating to the application of the present applicant, at the time of switching the operation from the refrigeration side circuit to the refrigeration side circuit in the refrigerating cycle configuration having the same refrigeration cycle configuration. Contrary to the conventional example, the refrigerant is initially opened by completely opening the flow path switching device to allow the refrigerant to flow in both the freezing side circuit and the refrigerating side circuit, storing a predetermined amount of refrigerant in the refrigerating compartment side circuit, and then switching to the refrigerating compartment cooling. There is no delay.

[Patent Document 1]

Japanese Patent Laid-Open No. 2002-267312

However, the pump-down operation in the above-described conventional example does not only contribute to the cooling of the room itself, but also when the ambient temperature of the refrigerator is high or when hot food is put into the refrigerator, If the pumpdown operation is performed at the rotational speed when the rotational speed is high, when the three-way valve 14 is switched to the refrigeration-side circuit 21 to perform the refrigeration side cooling operation after the pumpdown operation, the pumpdown operation is performed. As a result, a large amount of refrigerant stored in the condenser 13 is press-fitted into the refrigerating cooler 9 which has become a void by the high-speed compressor 12. As a result, there has been a problem that the user's hearing discomfort is caused by a sudden increase in the refrigerant flow noise and noise, and an intermittent generation of the refrigerant flow noise.

In addition, according to Patent Document 1, it is possible to prevent the occurrence of a refrigerant delay in the refrigerating cooler at the time of switching the operation from the refrigeration side circuit to the refrigerating side circuit, but the refrigerant flows in both the refrigerating and refrigerating side circuits. Therefore, the refrigerating capacity is lowered, and depending on the load conditions in the refrigerating chamber, there is a drawback that the time period for simultaneous cooling operation becomes long and inefficient. The refrigerant flow path to the refrigeration cooler has a smaller flow path resistance than the refrigerant flow path to the refrigeration cooler in order to operate at a high evaporation temperature in the refrigeration cooling mode in which the refrigerant flows only to the refrigeration cooler. Therefore, when both refrigerants flow, there is a problem that a lot of refrigerant flows by the refrigeration cooler side.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to reduce the cooling loss due to the refrigerant delay at the time of switching the flow path during the operation switching from the cooling operation of the refrigeration side circuit by the refrigerant flow path switching device such as a three-way valve to the refrigerating side circuit. An object of the present invention is to provide a refrigerator that performs this high cooling operation and simultaneously flows a refrigerant to each of the refrigerators for freezing and refrigerating, thereby preventing the occurrence of noise.

In order to solve the above problems, the refrigerator of the present invention according to claim 1 is provided with a freezing and refrigerating cooler and a cooling fan circulating cold air for cooling the freezing storage space and the refrigerating storage space, respectively, by a flow path switching valve. The coolant flow path is alternately cooled to the freezing and refrigerating coolers, and when the coolant flow path is changed from the freezing cooler to the freezing cooler, the coolant space cooling mode operation is performed after the simultaneous cooling mode operation in which the coolant flows to both coolers. In a refrigerator to be operated, when the temperature difference of the refrigerant inlet / outlet portion of the refrigerating cooler is less than or equal to the predetermined value during the simultaneous cooling mode operation, the flow path resistance to the refrigerating cooler is increased; The refrigerator according to the invention according to claim 2 has a freezing storage space and A refrigeration and refrigeration cooler and a cooling fan circulating cold air are respectively provided for exclusively cooling the long storage space, and a refrigerant flow path is alternately switched to the freezing and refrigerating coolers by a flow path switching valve to cool the same. When the refrigerant flow path is switched from the cooler to the refrigerating cooler, a refrigerator configured to perform the refrigerating space cooling mode operation after the simultaneous cooling mode operation in which the refrigerant flows to both coolers, wherein the flow path resistance of the refrigerating cooler is determined by It is characterized by making the flow path resistance smaller than the flow path resistance and making the flow path resistance to the refrigeration cooler larger than the flow path resistance at the time of normal operation at the time of simultaneous cooling mode operation.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described based on drawing. Fig. 2 is a longitudinal sectional view of the refrigerator, in which the inside of the refrigerator main body 1 formed of a heat insulating housing is a storage space, and the refrigerator compartment 2 at the top, the vegetable compartment 3 at the bottom thereof, and the freezer compartment 4 at the bottom thereof are independently. It arrange | positions, The automatic ice-making room 5 and the multi-temperature switching room which are not shown are juxtaposed to the left and right through the heat insulation partition wall between the refrigerating chamber 2 and the vegetable compartment 3, and the front door opening of each storage compartment respectively has a dedicated door. (6) is installed to block the opening and closing.

In the rear part of the freezer compartment 4, the refrigerator 7 for freezer storage spaces, such as a freezer compartment and an ice-making compartment, and the fan 8 which circulates the cold air produced | generated by this cooler 7 via a duct to a storage compartment are arrange | positioned, On the back of (2), a refrigerant compressor (12) provided with a refrigerator (9) and a fan (10) for a cold storage space for cooling the refrigerator compartment (2) and the vegetable compartment (3), and installed in the machine compartment (11) below the main body. The cool air cooled by the coolers 7 and 9 by the driving of the air is blown to the respective storage chambers by the rotation of the fans 8 and 10 to control the cooling to a predetermined temperature.

As shown in Fig. 3, each of the storage chambers includes a compressor 12 for discharging the refrigerant gas at a high temperature and high pressure, a condenser 13 for dissipating and liquefying the refrigerant gas, and a three-way valve 14 serving as a switching device for the refrigerant passage. The first throttling device (15) is formed from the three-way valve (14) by forming a circuit connecting the throttling device (15) and the refrigerating cooler (9) on the high temperature side in series to return to the compressor (12). And the second throttling device 16, the refrigeration cooler 7 on the low temperature side, the accumulator 17, and the check valve 18 in order, in parallel with the refrigerating side circuit 21 including the cooler 9 on the high temperature side. It is cooled by the refrigeration cycle 20 which connected the refrigeration side circuit 22 which connected.

Each piping of the refrigeration cycle 20 is connected to each other in the machine room 11 to form a cycle, and a refrigerant, such as isobutane, which is combustible isobutane without destruction of the ozone layer and a low global warming system. HC refrigerant is sealed.

And the refrigerating side which consists of the 1st throttle device 15 and the refrigerator | cooler 9 for refrigeration by the said three-way valve 14 by the detection temperature of the temperature sensor not shown in the refrigerator compartment 2, the freezer compartment 4, etc. The circuit 21 or the freezing side circuit 22 composed of the second throttling device 16, the freezing cooler 7, the accumulator 17, and the check valve 18 alternates the flow path to supply and cool the refrigerant. At the same time, refrigerating the refrigerating chamber 2 or the vegetable chamber 3 on the high temperature side by the rotation of the fans 8 and 10 disposed in the vicinity of the freezing cooler 7 and the refrigerating cooler 9 respectively. Each of the freezing storage spaces such as the storage space and the freezing chamber 4 and the automatic ice making chamber 5 on the low temperature side is independently controlled to be cooled to a predetermined temperature.

Fig. 4, denoted by the same reference numerals as in Fig. 3, shows a refrigeration cycle in the refrigeration cooling mode in which the refrigeration-side circuit 21 performs the cooling operation, and this refrigeration cooling mode and the same refrigeration in Fig. 5 as in Fig. By mutual cooling operation which performs the refrigeration mode which performs the refrigeration operation of the refrigeration side circuit 22 shown by a cycle alternately, the storage space of both a refrigerator temperature zone and a refrigeration temperature zone is alternately cooled, and both storage spaces are cooled to predetermined temperature. If the storage chamber temperature is higher than the set temperature by the increase of the temperature in the storage chamber after that, the compressor 12 and the fan (8) (10) is started again, the corresponding storage space The cold air is circulated to cool.

As shown in the timing chart of Fig. 1, the control of the cooling operation includes the detection temperature of the storage temperature sensor arranged in each of the refrigerating and freezing spaces, the set temperature in each storage chamber, and the compressor 12 at the time of operation. Compensation calculation is performed from the operating states such as the number of rotations of the fans (8) and (10), and the freezing capacity is varied by the heat load in the room, and the freezing storage space and the refrigerating space are alternately cooled between the freezing cooling mode and the freezing cooling mode. Do it.

In the state of the refrigeration cooling mode, the refrigerant evaporation temperature is lower than the freezing space temperature. On the other hand, the ambient temperature of the refrigeration cooler 9 provided in the back surface of the refrigerating chamber 2 is 0 degreeC or more, and since the refrigerant | coolant in the refrigeration cooler 9 evaporates, there is no liquid refrigerant.

Therefore, even if it is switched to the three-way valve 14 from this state, ie, in the refrigeration cooling mode which distributes a refrigerant | coolant to the refrigeration side circuit 21, the refrigerant | coolant in the said refrigeration side circuit 22 is a refrigeration cooler 7 and an accumulator. The refrigerant is stored in (17), and the amount of refrigerant for cooling the refrigeration cooler 9 is insufficient, and since there is no refrigerant in the pipe of the refrigeration cooler 9 immediately after switching, the refrigerant contributes to cooling. The slowing inflow of the slows down the cooling action.

In order to prevent a refrigerant delay, the three-way valve 14 is completely opened for a predetermined time during the operation switching from the refrigeration side circuit 22 to the refrigeration side circuit 21, and the refrigeration side circuit as shown in FIG. Simultaneous cooling mode operation in which the compressor 12 is operated is performed in both the refrigeration circuit 22 and the refrigeration circuit 22, and the refrigerant flow circuit is refrigerated by the three-way valve 14 after the predetermined time. The circuit 21 is switched to cool the refrigerating storage space.

At this time, the first throttle device 15 formed of a capillary tube connected between the three-way valve 14 and the refrigerating cooler 9 has a flow resistance more than that of the second throttle device 16 on the refrigeration cooler 7 side. Since it is small, it is easy to introduce refrigerant. And since the temperature of the refrigeration cooler 9 is high immediately after switching of a flow path, although the refrigerant | coolant which flowed in is less likely to reach the exit of the cooler 9 by promoting evaporation, liquid refrigerant flows gradually over time, The refrigerant passage is switched to the refrigeration cooling mode in a step after a predetermined time flowing sufficiently near the outlet portion.

As described above, when switching from the refrigeration cooling mode to the refrigeration cooling mode, the cooling loss is reduced and the efficiency is reduced by interposing a simultaneous cooling mode in which the refrigerant flows in both the refrigerating side circuit 21 and the freezing side circuit 22. This high cooling operation can be performed, and the refrigerant delay at the time of switching to the refrigeration side cooling after the conventional pump-down operation can be eliminated, and the generation of noise due to the refrigerant can be prevented.

Simultaneous cooling mode operation is achieved by the required amount of refrigerant flowing into the refrigerating cooler (9), the operation time is preferably as short as possible, in the present invention, the inlet and outlet of the refrigerating cooler (9) The temperature sensors 23 and 24 are installed in the chamber and the temperature difference is measured to detect the refrigerant flow in the refrigerator cooler 9, and the simultaneous cooling mode is terminated when the temperature difference becomes smaller than the predetermined value. have.

In other words, immediately after switching to the simultaneous cooling mode, the temperature of the inlet of the refrigeration cooler 9 is lowered but the amount of refrigerant inflow is still insufficient, so that the superheat state evaporates in the cooling engine to the opening, and the temperature of the opening is lowered. It doesn't work. When the amount of coolant in the refrigerating cooler 9 elapses over time, the superheat phenomenon of the opening is eliminated. Therefore, the timing of switching from the simultaneous cooling mode to the refrigerating cooling mode operation by detecting the low temperature and detecting the temperature difference from the inlet temperature. The operation time of the simultaneous cooling mode according to the above is usually about 5 minutes in 40 to 60 minutes which is one cycle of refrigeration and freezing operation time.

At this time, when the temperature difference between the temperature sensors 23 and 24 at the inlet and outlet is smaller than a predetermined value, the refrigerant flow path resistance is increased, and when the temperature difference is large, the flow path resistance is controlled to be reduced.

Originally, in the parallel cycle in which the refrigeration side circuit 22 and the refrigeration side circuit 21 are connected in parallel as in the above embodiment, the cycle efficiency can be increased by increasing the evaporation temperature in the refrigeration cooling mode. The flow path resistance of the first throttle device 15 on the cooler 9 side is smaller and looser than that of the second throttle device 16 on the freezer cooler 7 side. When the system is shifted to the simultaneous cooling mode operation in this state, the refrigerant does not flow to the refrigeration side circuit 22 having a large flow path resistance, but flows only to the refrigeration side circuit 21 having a low resistance. In addition, when a large amount of coolant flows, the coolant does not completely evaporate in the refrigerating-side circuit 21 which does not normally have an accumulator, causing a liquid back phenomenon in which the liquid coolant is returned to the compressor 12. .

Therefore, in the simultaneous cooling mode operation, it is necessary to prevent excessive flow of the refrigerant to the refrigerating cooler 9 so that the coolant flows in a balanced manner in both the refrigerating and refrigerating coolers 7 and 9, in order to do so. The throttling degree of the 1st throttling device 15 of the refrigeration side circuit 21 which flows easily can be adjusted.

The throttling adjustment of the 1st throttling device 15 is carried out to the flow path downstream of the three-way valve 14 which is a switching device of the refrigerant | coolant flow path in the refrigerating side circuit 21, as shown in FIG. By disposing a refrigerant control valve 25 such as an automatic expansion valve and detecting the temperature difference between the temperature sensors 23 and 24 provided in the inlet and the outlet of the refrigerant in the refrigerating cooler 9, Therefore, the valve opening degree of the refrigerant control valve 25 is set to a predetermined value to control the amount of refrigerant flowing to the throttling device 15.

That is, when the temperatures of the refrigerant inlet and outlet of the refrigerating cooler 9 are equal, it indicates that the amount of refrigerant flowing is too large, and the opening degree of the refrigerant control valve 25 is normally adjusted to return to the compressor 12. About 5 to 20%, and the flow path resistance is adjusted so that the temperature at the outlet side of the refrigerating cooler 9 becomes a weak superheat state in which the temperature at the outlet side of the refrigerating cooler 9 is 2 to 4 ° C higher than the inlet side.

On the contrary, when the temperature difference between the inlet and the outlet side is large, the amount of refrigerant is insufficient and the superheat state is established. Therefore, the opening degree of the refrigerant control valve 25 is increased to decrease the flow path resistance, so that the above super weak state is achieved. In this way, the cooling loss caused by the refrigerant delay can be prevented and the refrigerant can be flowed in the freezing and refrigerating coolers 7 and 9 in a balanced manner without causing liquid back.

In the above embodiment, the refrigerant flow path resistance to the refrigeration cooler 9 is adjusted by measuring the inlet and outlet temperatures of the refrigeration cooler 9, but the present invention is not limited thereto, and the fixed flow path resistance is fixed in a state where the flow path resistance is increased to some extent. The coolant may be allowed to flow through the coolers 7 and 9 at both times. In this case, it is adjusted to the refrigerant flow path resistance in which liquid refrigerant is not filled to the outlet of the refrigeration cooler 9 for a predetermined time, or the time for letting the refrigerant flow through the coolers 7 and 9 with the flow path resistance set first. Do it.

According to the above configuration, the control is performed to perform simultaneous cooling mode operation until the liquid refrigerant is filled up to the outlet of the refrigerating cooler 9, and the temperature sensors 23 and 24 measuring the temperature of the refrigerating cooler 9 are performed. ) Can be unnecessary.

In addition, although the refrigerant control valve 25 was made into another component in the said embodiment, it is not limited to this, You may make it integrally form the flow control mechanism in the outlet opening of the three-way valve 14 which switches a flow path.

As described above, during the simultaneous cooling mode operation in which the three-way valve 14 is completely opened to allow the refrigerant to flow to both the refrigeration side and the refrigeration side circuits 21 and 22, the refrigerant passage is then refrigerated. Compared with the refrigeration cooling mode performed by switching to the circuit 21, the evaporation temperature of the refrigerant is caused by the low-pressure refrigeration cooler 7, so that the evaporation temperature is lowered, the refrigeration efficiency is lowered, and at both the freezing side and the refrigeration side. Since the coolant flows, the amount of coolant to the refrigerating cooler 9 decreases, and thus the freezing capacity of the refrigerator as a whole becomes low.

Therefore, during the simultaneous cooling mode operation, the cooling fan is adapted to the lowering of the freezing capacity, and at the same time, the rotation of either of the fans becomes the rotation of the two fans 8 and 10 for freezing and refrigerating. (8) The rotation speed of (10) is controlled to be low rotation, for example, 40 to 70% of normal time, and the low rotation makes the fans 8 and 10 of both the refrigeration and refrigeration rotate, thereby increasing the noise. You can also suppress anger.

In addition, in order to shorten the operation time of the simultaneous cooling mode and to cope with the above-mentioned lowering of the refrigerating capacity, the rotation speed of the compressor 12 may be increased to maintain the cooling power of the refrigerating and refrigerating spaces. The rotation speed of the compressor 12 which is driven at 50 Hz to 76 Hz is increased by about 20 to 50% to operate.

In addition, during the simultaneous cooling mode, the rotation speed of the heat radiation fan 19 for cooling the compressor 12 or the condenser 13 installed in the machine room 11 to promote heat dissipation is made higher than usual, and the refrigerating capacity is increased. The operation time of the simultaneous cooling mode may be shortened.

In addition, at the end of the simultaneous cooling mode operation, as shown in Fig. 7, the refrigerant flow path switching valve 14 is closed while the compressor 12 continues to operate, so that the freezing side circuit 22 and the refrigerating side circuit 21 are closed. May be provided with a pump-down mode for interrupting the refrigerant flow to the refrigerant and recovering the refrigerant on the low pressure side of the refrigeration cycle.

Regarding the above, when switching from the conventional refrigeration cooling mode to the refrigerating cooling mode, the pump-down operation of recovering the refrigerant on the low pressure side is performed by closing the flow path switching valve 14 and operating the compressor l2 in the closed state. Although the present invention, prior to this, the simultaneous cooling mode for allowing the refrigerant to flow in both the refrigeration side circuit 22 and the refrigeration side circuit 21 is provided, and stays in the refrigeration cooler 7 as compared with the conventional method. The refrigerant can be recovered in a short time by pumping down with a small amount of refrigerant.

Therefore, it is possible to shorten the operation time of the refrigerant recovery mode, which is a wasteful time that does not contribute to the cooling of the storage space, and it is possible to quickly switch to the refrigeration cooling mode. In addition, since the refrigerant recovery time is changed by the refrigerant suction force of the compressor 12, the rotation speed of the compressor is changed at the time of refrigerant recovery, for example, 90 seconds when the rotation speed is 25 rpm, and when the rotation speed is 75 rpm By setting it as 45 second, optimal refrigerant | coolant recovery can be enabled.

In addition, the rotation speed of the compressor 12 during the pump-down operation described above may be in a state of rotation speed during simultaneous cooling without lowering to a medium speed as shown in FIG. 1, and the freezing fan 8 is a refrigeration cooler 7 in this embodiment. In order to accelerate the recovery of the refrigerant in the cavity), the operation is performed at a low speed. However, the present invention is not limited thereto and may be stopped.

The present invention provides a refrigerator for cooling the freezing storage space and the refrigerating storage space exclusively and a fan for circulating cold air, and the refrigerant flow path is alternately switched to the freezing and refrigerating cooler by a flow path switching valve to be used for a refrigerator. Can be.

According to the configuration of the present invention, the refrigerant is retained in the refrigerating cooler by performing a simultaneous cooling mode operation in which the refrigerant is circulated in the freezing and refrigerating side cooling circuits before the refrigeration-side cooling operation. The coolant can be supplied to the cooler, the cooling loss caused by the coolant delay can be eliminated, and the coolant can be flowed in a balanced manner to the freezing and refrigerating cooler, thereby improving the cooling efficiency. In addition, the coolant flow noise at the start of the refrigerating side cooling operation can be eliminated, and the user's discomfort with respect to the generated joint can be reduced.

Claims (6)

A refrigeration and refrigerating cooler and a cooling fan circulating cold air are respectively provided for cooling the refrigerating storage space and the refrigerating storage space exclusively, and the refrigerant flow path is alternately switched to the refrigerating and refrigerating coolers by a flow path switching valve. At the same time, when the refrigerant flow path is switched from the refrigeration cooler to the refrigerating cooler, the refrigerator is configured to perform the refrigerating space cooling mode operation after the simultaneous cooling mode operation in which the refrigerant flows to both coolers. And a flow path resistance to the refrigerating cooler is increased when the temperature difference between the coolant inlet and outlet portions of the cooler is less than or equal to a predetermined value, and the flow path resistance is reduced to be smaller than the predetermined value. A refrigeration and refrigerating cooler and a cooling fan circulating cold air are respectively provided for cooling the refrigerating storage space and the refrigerating storage space exclusively, and the refrigerant flow path is alternately switched to the refrigerating and refrigerating coolers by a flow path switching valve. At the same time, when the refrigerant flow path is switched from the refrigeration cooler to the refrigerating cooler, the refrigerator having the refrigerated space cooling mode operation is performed after the simultaneous cooling mode operation in which the refrigerant flows to both coolers. A refrigerator characterized by being smaller than the flow path resistance of the refrigeration cooler and making the flow path resistance to the refrigerating cooler larger than the flow path resistance in normal operation during the simultaneous cooling mode operation. The refrigerator according to claim 1 or 2, wherein the flow path resistance to the refrigerating cooler is adjusted by a refrigerant control valve that also serves as a flow path switching valve. The refrigerator according to claim 1 or 2, wherein, in the simultaneous cooling mode operation, the rotation speed of the cold air circulation fan of the freezing and refrigerating coolers is made lower than normal. The refrigerator according to claim 1 or 2, wherein the rotational speed of the compressor is set to be higher than that of normal cooling during the simultaneous cooling mode operation. The refrigerant recovery mode operation according to claim 1 or 2, wherein after completion of the operation in the simultaneous cooling mode, a flow path switching valve stops the refrigerant flow to the refrigerating and refrigerating coolers, and recovers the refrigerant in each cooler to the compressor. The refrigerator characterized by the above-mentioned.

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