CN1818521A - refrigerator - Google Patents

Abstract

A refrigerator is provided with coolers (7, 9) and cold air circulation fans (8, 10) specially for cooling the freezing space and the refrigerating space respectively, and the flow path of the refrigerant is alternately switched to The chiller for freezing and the cooler for refrigerating perform cooling, and when the refrigerant flow path is switched from the cooler for freezing (7) to the cooler for refrigerating (9), cooling is performed after the simultaneous air-cooling mode operation of both coolers Mode operation, when the simultaneous cooling mode is operated, if the temperature difference between the refrigerant inlet and outlet of the refrigerator for refrigeration is less than or equal to a specified value, the flow path resistance to the refrigerator for refrigeration is increased, and if it is greater than or equal to a specified value, it is decreased. The flow resistance. When switching from the cooling operation of the refrigeration side circuit to the operation of the refrigeration side circuit using a refrigerant flow switching device such as a three-way valve, the cooling loss caused by the refrigerant delay during flow switching can be reduced, and efficient cooling operation can be performed. At the same time, the refrigerant flows to the coolers for freezing and refrigeration in a balanced manner to prevent abnormal noise.

Description

refrigerator

technical field

The invention relates to a refrigerator, which is provided with a cooler for cooling a freezing storage space and a refrigerating storage space, and a fan for circulating cold air, and alternately cools the freezing and refrigerating storage spaces through a flow path switching valve.

Background technique

Fig. 8 shows the refrigerating cycle of the existing refrigerator. As the compressor 12 that compresses and discharges the refrigerant, a compressor with variable capacity is used, and the condenser 13 and the refrigerant flow switching device composed of a three-way valve 14 are used. , the first throttling device 15 and the cooler 9 for refrigeration are connected with the compressor 12, and the second throttling device 16 and the cooler 7 for freezing, the accumulator 17 and the one-way valve 18 are connected with the first throttling device 15 and the cooler 9 for refrigeration are connected in parallel to form a refrigeration cycle 20.

And, according to the detection temperature of the temperature sensor for detecting the indoor temperature of the refrigerator compartment and the freezer compartment, the refrigerant flow path is alternately switched by the first throttle device 15 and the cooler for refrigeration by the flow path switching device 14 . The refrigerating side circuit 21 composed of 9, and the refrigerating side circuit 22 composed of the second throttling device 16, the refrigerating cooler 7, the accumulator 17 and the one-way valve 18 operate, and the The rotation of the cold air circulation fans near the coolers 7 and 9 independently and alternately controls the cooling of the refrigerating room space and the freezing room space, and when switching from the cooling operation of the refrigerating side circuit 22 to the cooling operation of the refrigerating side circuit 21 The three-way valve 14 is closed for a certain period of time, and the refrigerant does not flow to the refrigeration side circuit 21 and the refrigeration side circuit 22. By operating the so-called suction operation of the compressor 12, the refrigerant stagnant in the cooler is sucked. , to ensure the amount of refrigerant circulation to the refrigerator 9 for refrigeration, and then the refrigerant flows to the refrigeration side circuit 21 to cool the refrigeration space.

With this suction operation, the refrigerant stagnant in the cooler 7 on the low-pressure side is sucked from the three-way valve 14, forced to transfer to the condenser 13 on the high-pressure side, and the refrigerant is quickly supplied to the cooler for refrigeration after suction. 9. Therefore, it has the advantages of maintaining the circulation amount of the refrigerant and improving the cooling efficiency of the refrigerated space.

In addition, as shown in FIG. 9 described in Patent Document 1 filed by the applicant of the present application, when switching from the cooling operation of the refrigeration side circuit to the operation of the refrigeration side circuit in a refrigeration cycle structure composed of the same refrigeration cycle structure as described above, and Contrary to the aforementioned conventional example, by fully opening the flow path switching device, the refrigerant flows in both the freezing side circuit and the refrigerating side circuit, and the predetermined amount of refrigerant is stored in the refrigerating room side circuit and then switched to cooling in the refrigerating room. Refrigerant delay occurs at the beginning.

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2002-267312.

However, the suction operation itself in the above-mentioned conventional example is not only not conducive to indoor cooling, but also when the compressor 12 rotates at a high speed when the ambient temperature of the refrigerator is high or when high-temperature food is placed in the refrigerator, if the In this way, when the suction operation is performed at this rotational speed, when the three-way valve 14 is switched to the refrigeration side circuit 21 in order to perform the refrigeration side cooling operation after the suction operation, the refrigerant stored in the condenser 13 by the suction operation will be reduced. A large amount is compressed into the cooler 9 for refrigeration which is in a gap state by the high-rotational compressor 12 . As a result, the refrigerant flow sound suddenly becomes louder and becomes a noise, and there is a problem that the user feels uncomfortable due to the intermittent generation of abnormal refrigerant flow sound.

In addition, according to Patent Document 1, although it is possible to prevent the delay of the refrigerant in the refrigerating cooler when switching from the cooling operation of the refrigerating side circuit to the operation of the refrigerating side circuit, since the refrigerant flows in both the refrigerating and refrigerating side circuits, the The cooling capacity is reduced, and there are disadvantages that the time zone for simultaneous cooling operation becomes longer and the efficiency is poor for some load conditions in the refrigerator. In addition, the flow resistance of the refrigerant flow path toward the refrigerator for refrigeration is set to be smaller than that of the refrigerant flow path toward the cooler for freezing, so that in the refrigeration cooling mode in which the refrigerant flows only in the cooler for refrigeration , operates at a high evaporation temperature, therefore, when the refrigerant flows toward both sides, there is a problem that more refrigerant flows toward the side of the cooler for refrigeration.

Contents of the invention

In view of the above problems, it is an object of the present invention to provide a refrigerator that reduces the flow switching time when switching from the cooling operation of the freezing side circuit to the operation switching of the refrigeration side circuit by a refrigerant flow switching device such as a three-way valve. The refrigerant delays the resulting cooling loss to perform high-efficiency cooling operation, and at the same time allows the refrigerant to flow appropriately to the respective coolers for freezing and refrigerating to prevent the occurrence of abnormal noise.

In order to achieve the above object, the refrigerator according to the technical solution 1 of the present invention is provided with a freezing cooler and a refrigerating cooler for cooling the freezing storage space and the refrigerating storage space respectively, and a cooling fan for circulating cold air. The switching valve alternately switches the refrigerant flow path to the freezing cooler and the refrigerating cooler for cooling, and when switching the refrigerant flow path from the freezing cooler to the refrigerating cooler, After the simultaneous cooling mode operation in which both coolers flow, the refrigerated space cooling mode operation is performed. During the simultaneous cooling mode operation, if the temperature difference between the refrigerant inlet and outlet of the refrigerating cooler is less than or equal to a specified value, it will increase to the refrigerating cooling mode. If the flow path resistance of the device is greater than or equal to the specified value, then reduce the flow path resistance. The refrigerator of the technical scheme 2 of the present invention is provided with a freezing cooler and a refrigerating refrigerator for cooling the freezing storage space and the refrigerating storage space respectively. Using the cooler and the cooling fan that circulates the cold air, the flow path of the refrigerant is alternately switched to the cooler for freezing and the cooler for refrigeration through the flow path switching valve, and the cooling is performed from the cooler for freezing to the cooler for refrigeration. When the cooler switches the refrigerant flow path, the cooling mode operation is performed while the refrigerant flows to both coolers, and then the refrigerated space cooling mode operation is performed, and the flow path resistance to the refrigerating cooler is smaller than that of the freezing cooler , during simultaneous cooling mode operation, the flow path resistance toward the refrigerator for refrigeration is larger than that during normal operation.

According to the structure of the present invention, since the refrigerant is accumulated in the refrigerator for refrigeration by performing the simultaneous cooling mode operation in which the refrigerant flows through the freezing and refrigeration side cooling circuits before the refrigeration side cooling operation, it is possible to quickly start the refrigeration side cooling operation. Supplying the refrigerant to the cooler for refrigeration eliminates the cooling loss caused by the delay of the refrigerant, and makes the refrigerant flow to the cooler for freezing and the cooler for refrigeration in a balanced manner, thereby obtaining the advantage of improving cooling efficiency. In addition, the refrigerant flow noise at the start of cooling operation on the refrigeration side can be eliminated, and the user's sense of discomfort caused by abnormal noise can be reduced.

Description of drawings

Fig. 1 is a time chart showing the operation control of the refrigerator according to the first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing a general refrigerator.

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

Fig. 4 is a schematic diagram showing a refrigeration cycle in a refrigeration cooling mode shown in Fig. 3 .

Fig. 5 is a schematic diagram showing a refrigeration cycle in a refrigeration cooling mode shown in Fig. 3 .

Fig. 6 is a schematic diagram showing a refrigeration cycle of a refrigerator according to another embodiment of Fig. 3 .

Fig. 7 is a refrigeration cycle diagram showing a suction operation after the simultaneous cooling mode of Fig. 3 .

Fig. 8 is a schematic diagram showing a refrigeration cycle of a conventional refrigerator.

Fig. 9 is a time chart of operation control of a conventional refrigerator.

Detailed ways

An embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 2 is a vertical cross-sectional view of the refrigerator. The interior of the refrigerator body 1 formed by the heat-insulating box is used as a storage space, and the refrigerator compartment 2 is independently arranged on the uppermost part, the vegetable compartment 3 is arranged below the refrigerator chamber 2, and the vegetable compartment 3 is arranged on the lowermost part. The freezer compartment 4 has an automatic ice-making compartment 5 and an unillustrated multi-temperature switching compartment arranged side by side between the refrigerating compartment 2 and the vegetable compartment 3 through a heat-insulating partition wall. The door 6 is sealed with opening and closing freely.

A cooler 7 for refrigerated storage spaces such as a freezer and an ice-making room, and a fan 8 for circulating the cold air generated by the cooler 7 in the storage room through ducts are arranged at the rear of the freezer compartment 4, and are arranged on the back side of the refrigerator compartment 2. The cooler 9 and the fan 10 for cooling the refrigerated storage room 2 and the vegetable room 3 are driven by the refrigerant compressor 12 arranged in the machine room 11 at the lower part of the main body, and the rotation of the fans 8 and 10 is used to drive the refrigerated storage space. The cold air cooled by the coolers 7 and 9 is sent to each storage room, and their respective cooling is controlled at a prescribed temperature.

As shown in FIG. 3 , the storage chambers are cooled by a refrigeration cycle 20. The refrigeration cycle 20 has the following structure: a compressor 12 that discharges high-temperature and high-pressure refrigerant gas, a condenser 13 that radiates heat and liquefies the refrigerant gas, The three-way valve 14 serving as a switching device for the refrigerant flow path connects the first throttling device 15 and the refrigerating cooler 9 on the high-temperature side in series to form a return circuit to the compressor 12 . The refrigerating side circuit 22 is connected in parallel with the refrigerating side circuit 21, wherein the refrigerating side circuit 21 is composed of the first throttling device 15 and the cooler 9 on the high temperature side, and the refrigerating side circuit 22 sequentially connects the first 2 The throttling device 16 is formed by connecting the refrigerating cooler 7 on the low temperature side, the accumulator 17 and the check valve 18.

The pipes of the refrigeration cycle 20 are connected to each other in the machine room 11 to form a cycle, and as the refrigerant, HC refrigerant such as hydrocarbons such as isobutane, which does not destroy the ozone layer and has a low global warming coefficient but is flammable, is enclosed. .

And, according to the detection temperature of the unillustrated temperature sensor provided in the refrigerator compartment 2 and the freezer compartment 4, etc., the flow path is switched alternately to the refrigerator-side circuit 21 or the freeze-side circuit 22 through the three-way valve 14 to supply The refrigerant performs cooling operation, and the refrigerating side circuit 21 has a first throttling device 15 and a cooler 9 for refrigeration, and the freezing side circuit 22 has a second throttling device 16, a refrigerating cooler 7, an accumulator 17 and a one-way At the same time, the valve 18 controls the refrigerated storage spaces such as the refrigerated room 2 and the vegetable room 3 on the high temperature side, and the low temperature side by the rotation of the fans 8 and 10 respectively disposed near the refrigerated cooler 7 and the refrigerated cooler 9 . The freezer storage spaces such as the freezer compartment 4 on the side and the automatic ice maker compartment 5 are independently cooled and controlled to a predetermined temperature.

FIG. 4 denoting the same parts as in FIG. 3 shows a refrigeration cycle in the refrigeration cooling mode in which the refrigeration side circuit 21 performs a cooling operation, and the refrigeration cycle in FIG. 5 similar to FIG. The refrigerating-cooling mode in which the refrigerating-side circuit 22 performs the cooling operation is alternately performed in the refrigerating-cooling mode, thereby alternately cooling both storage spaces in the refrigerating temperature zone and the freezing temperature zone, and when both storage spaces are cooled to a predetermined temperature , the compressor 12 is stopped, and when the temperature of any storage room is higher than the set temperature due to the temperature rise in the storage room, the compressor 12 and the fans 8, 10 are started again to cool the storage space with circulating cold air.

As shown in the time chart of FIG. 1 , the control of the cooling operation is based on the temperature detected by the storage room temperature sensors respectively arranged in the refrigerating space and the freezing space, the set temperature in the respective storage rooms, and the compression of the operating time. The running state of machine 12 and fans 8, 10, etc. is corrected and calculated, and the cooling capacity is changed by utilizing the heat load in the room, and the freezing storage space and the refrigerating space are alternately cooled in the freezing cooling mode and the refrigerating cooling mode.

In addition, in the state of the freezing cooling mode, the refrigerant evaporation temperature is lower than the freezing space temperature. On the contrary, if the ambient temperature of the cooler 9 for refrigeration on the back side of the refrigerator compartment 2 is greater than or equal to 0° C., the refrigerant in the cooler 9 for refrigeration evaporates, so there is no liquid refrigerant.

Therefore, even if the three-way valve 14 is used to switch from this state to the refrigerating and cooling mode in which the refrigerant flows through the refrigerating side circuit 21, the refrigerant in the refrigerating side circuit 22 is still stored in the refrigerating cooler 7 and the energy storage unit. In the device 17, the amount of refrigerant used to cool the cooler 9 for refrigeration is insufficient accordingly, and there is no refrigerant in the tube of the cooler 9 for refrigeration just after switching, so the inflow of the refrigerant that is beneficial to cooling is delayed, thereby delaying the cooling effect. .

In order to prevent the delay of the refrigerant, when switching from the cooling operation of the refrigeration side circuit 22 to the refrigeration side circuit 21, the three-way valve 14 is fully opened for a predetermined time. As shown in FIG. 22 are all made in the state of making the refrigerant flow, and the simultaneous cooling mode operation is implemented to operate the compressor 12. After the predetermined time, the refrigerant flow circuit is switched to the refrigeration side circuit 21 through the three-way valve 14, and the storage space is refrigerated. cooling.

At this time, the first throttling device 15 composed of a capillary tube connected between the three-way valve 14 and the cooler 9 for refrigeration can easily flow in because its flow resistance is smaller than that of the second throttling device 16 on the side of the cooler 7 for freezing. Refrigerant. Moreover, immediately after the switching of the flow path, since the temperature of the cooler 9 for refrigeration is high, the inflowing refrigerant seldom flows to the outlet of the cooler 9 due to the promotion of evaporation, but as time goes by, the liquid refrigerant gradually increases its flow. , the refrigerant flow path is switched to the refrigeration cooling mode after a predetermined time has elapsed since the refrigerant has sufficiently flowed to the vicinity of the outlet.

As described above, when switching from the freezing cooling mode to the refrigeration cooling mode, by inserting the simultaneous cooling mode in which the refrigerant flows through both the refrigeration side circuit 21 and the freezing side circuit, the cooling loss can be reduced and efficient cooling operation can be performed. This eliminates the delay of the refrigerant when switching to the cooling side after the conventional suction operation, and prevents the noise generated by the flow of the refrigerant.

At the same time, the purpose of cooling mode operation is realized by flowing a necessary amount of refrigerant in the cooler 9 for refrigeration, and its operating time is preferably as short as possible. Temperature sensors 23 and 24 are installed at the outlet to measure the temperature to detect the inflow of refrigerant in the refrigerator 9, and the simultaneous cooling mode ends when the temperature difference becomes smaller than a predetermined value.

That is, immediately after switching to the simultaneous cooling mode, although the temperature at the inlet of the cooler 9 for refrigeration becomes low, the inflow of the refrigerant is not sufficient, so it becomes a superheated state in which it evaporates in the cooler tube up to the outlet, and the outlet temperature does not drop. When the amount of refrigerant in the cooler 9 for refrigeration becomes sufficient over time, since the overheating phenomenon at the outlet portion disappears, the temperature difference between the inlet temperature and the low temperature is detected by detecting the low temperature, thereby serving as simultaneous cooling. The time for mode switching to the refrigerating and cooling mode operation, the above-mentioned simultaneous cooling mode operation time is about 5 minutes out of the 40 to 60 minutes of the refrigerating and refrigerating operation time of about one cycle.

At this time, the control is such that when the temperature difference between the temperature sensors 23 and 24 at the inlet and outlet is less than a certain value, the refrigerant flow resistance is increased, and when the temperature difference is greater than a certain value, the flow resistance is decreased.

Originally, as described in the above-mentioned embodiment, in the parallel cycle in which the refrigeration side circuit 22 and the refrigeration side circuit 21 are connected in parallel, the cycle efficiency can be improved by increasing the evaporation temperature in the refrigeration cooling mode. The flow path resistance of the first throttle device 15 is set to a gentle throttle degree that is smaller than that of the second throttle device 16 on the refrigeration cooler 7 side. In this state, when the simultaneous cooling mode operation is entered, the refrigerant does not flow into the freezing-side circuit 22 having a large flow path resistance, and only flows into the refrigerating-side circuit 21 having a small resistance. In addition, when a large amount of refrigerant flows, the refrigerant does not have time to evaporate completely in the refrigerating side circuit 21 without an accumulator, and there is a problem that the liquid refrigerant returns to the compressor 12 .

Therefore, in the simultaneous cooling mode operation, it is necessary to prevent the refrigerant from flowing too much into the refrigerating cooler 9, and make the refrigerant flow in both the refrigerating cooler 7 and the refrigerating cooler 9 in a balanced manner. The degree of throttling of the first throttling device 15 of the refrigeration side circuit 21 through which the refrigerant flows more easily.

The throttling adjustment of the first throttling device 15 is as shown in FIG. 6 marked with the same reference numerals as above. The refrigerant control valve 25 such as an expansion valve detects the temperature difference between the temperature sensors 23 and 24 provided at the refrigerant inlet and outlet of the refrigerator 9 to open the valve of the refrigerant control valve 25 according to the temperature difference. The temperature is set to a predetermined value, and the amount of refrigerant flowing through the expansion device 15 is controlled.

That is, when the refrigerant inlet and outlet temperatures of the refrigerating cooler 9 are equal, it indicates that the amount of refrigerant flowing is too much and the liquid returns to the compressor 12, so the opening degree of the refrigerant control valve 25 is throttled by 5 to 20 relative to the normal time. %, the flow path resistance is adjusted so that the temperature on the outlet side of the cooler 9 for refrigeration becomes 2 to 4° C. higher than the inlet side in a weakly overheated state.

On the contrary, when the temperature difference between the inlet and the outlet side is large, the overheated state is caused due to insufficient refrigerant, so the opening degree of the refrigerant control valve 25 is increased to reduce the flow path resistance, and the same weak superheated state as described above is adjusted. This structure can prevent the cooling loss caused by the delay of the refrigerant, and will not return in liquid state, so that the refrigerant can flow in the cooler 7 for freezing and the cooler 9 for refrigeration in a balanced manner.

In the above-described embodiment, the resistance of the refrigerant flow path to the refrigerator 9 is adjusted by measuring the inlet and outlet temperatures of the refrigerator 9 for refrigeration. Fixing is carried out in a state where the resistance is increased, and the refrigerant flows through both coolers 7 and 9 for a certain period of time. At this time, within a certain period of time, adjust the flow path resistance of the refrigerant so that the liquid refrigerant is not filled to the outlet of the cooler 9 for refrigeration, or set the flow path resistance in advance and then determine the flow of the refrigerant in both coolers 7 and 9. time.

With the above configuration, the simultaneous cooling mode operation is controlled until the liquid refrigerant fills the outlet of the refrigerator 9, and the temperature sensors 23 and 24 for measuring the temperature of the refrigerator 9 are unnecessary.

In addition, in the above-mentioned embodiment, the refrigerant control valve 25 is made as a separate component, but it is not limited to this, and the flow control mechanism may be integrally formed at the outlet opening of the three-way valve 14 for switching the flow path.

As described above, while the three-way valve 14 is fully opened and the refrigerant flows through both the refrigeration-side and freezing-side circuits 21 and 22 while operating in the simultaneous cooling mode, the refrigerant flow path is switched to the refrigeration-side circuit after that. Compared with the refrigerating and cooling mode performed in 21, the evaporation temperature of the refrigerant becomes lower due to the low-pressure freezing cooler 7, and the cooling efficiency becomes lower. As the amount of refrigerant in the cooler 9 for refrigeration decreases, the cooling capacity of the refrigerator as a whole decreases.

Therefore, in the simultaneous cooling mode operation, in order to deal with the decline of the cooling capacity and the rotation of any one fan becomes the rotation of the two fans 8, 10 for freezing and refrigerating in normal times, so the fans 8, 10 for freezing and refrigerating coolers are used. The rotational speed of 10 is controlled to a low rotational speed, for example, 40-70% of normal time. By making the low rotational speed, the increase of the noise generated by the rotation of the fans 8 and 10 of both refrigeration and refrigeration can be suppressed.

In addition, in order to shorten the operation time of the simultaneous cooling mode and deal with the above-mentioned decline in cooling capacity, the cooling capacity of the freezing and refrigerating space can also be maintained by increasing the rotation speed of the compressor 12. The rotation speed of the compressor 12 is increased by about 20% to 50%.

In addition, in the simultaneous cooling mode, it is also possible to set the speed of the heat dissipation fan 19 which is helpful for cooling the compressor 12 and the condenser 13 arranged in the mechanical room 11 higher than the normal speed, so as to improve the cooling capacity and shorten the cooling time. Run time in simultaneous cooling mode.

The suction mode can also be set, and when the operation of the simultaneous cooling mode ends, as shown in FIG. The refrigerant in the refrigerating side circuit 21 circulates to recover the refrigerant on the low-pressure side of the refrigerating cycle.

As described above, conventionally, when switching from the refrigerating-cooling mode to the refrigerating-cooling mode, the flow path switching valve 14 is closed, and the compressor 12 is operated in the closed state to perform a suction operation for recovering the refrigerant on the low-pressure side. Before the invention, the simultaneous cooling mode in which the refrigerant flows through both the freezing-side circuit 22 and the refrigerating-side circuit 21 was provided. Compared with the conventional method, the amount of refrigerant remaining in the freezing cooler 7 was reduced. By performing suction, refrigerant recovery can be performed in a short time.

Therefore, it is possible to shorten the operation time of the refrigerant recovery mode, which is a useless time that does not contribute to the cooling of the storage space, and quickly switch to the refrigeration cooling mode. Since the refrigerant recovery time varies with the refrigerant suction force of the compressor 12, when recovering the refrigerant, by changing the rotational speed of the compressor, for example, 90 seconds at a rotational speed of 25rps, and 90 seconds at a rotational speed of 75rps. 45 seconds for optimal refrigerant recovery.

During the described suction operation, the rotating speed of the compressor 12 can also not be reduced to a medium speed as shown in Figure 1, but still be the rotating speed during cooling at the same time, and the cooling fan 8 is operated at a low speed in this embodiment. , to promote the recovery of the refrigerant in the cooling cooler 7 for freezing, but the present invention is not limited to this, and the fan 8 for freezing may also be stopped.

The present invention can be used in the case where there are coolers for cooling the refrigerated storage space and the refrigerated storage space respectively, and fans for circulating cold air, and the refrigerant flow path is alternately switched to the refrigerated cooler and the refrigerated storage space through the flow path switching valve. A refrigerator that cools with a cooler.

Claims (6)

1. refrigerator, it is characterized in that, be provided with respectively specially to keep in cold storage space and refrigeration storage space cool off freezing with cooler and refrigeration with cooler and cooling fan that cold air is circulated, by flow channel switching valve with refrigerant flow path alternately switch to described freezing with cooler and refrigeration cool off with cooler, with refrigerant flow path from freezing with cooler when refrigeration is switched with cooler, when flowing, cold-producing medium carries out the running of refrigerating space refrigerating mode after the refrigerating mode running in both sides' cooler, when refrigerating mode turns round at the same time, if the temperature difference that refrigerates the refrigerating fluid discharging and feeding portion that uses cooler is smaller or equal to setting, then increase to the flow path resistance of refrigeration with cooler, if more than or equal to setting, then reduce this flow path resistance.

2. refrigerator, it is characterized in that, be provided with respectively specially to keep in cold storage space and refrigeration storage space cool off freezing with cooler and refrigeration with cooler and cooling fan that cold air is circulated, by flow channel switching valve with refrigerant flow path alternately switch to described freezing with cooler and refrigeration cool off with cooler, with refrigerant flow path from freezing with cooler when refrigeration is switched with cooler, when flowing, cold-producing medium carries out the running of refrigerating space refrigerating mode after the refrigerating mode running in both sides' cooler, make to refrigeration littler than freezing flow path resistance with cooler with the flow path resistance of cooler, when refrigerating mode turns round at the same time, make the flow path resistance when refrigeration uses the flow path resistance ratio of cooler to turn round usually big.

3. refrigerator as claimed in claim 1 or 2 is characterized in that, to the adjusting of refrigeration with the flow path resistance of cooler, carries out with the cold-producing medium control valve of double as flow channel switching valve.

4. refrigerator as claimed in claim 1 or 2 is characterized in that, refrigerating mode when running at the same time, freezing is rotating speed low when common with cooler and refrigeration with the rotating speed of the circulating cold air fan of cooler.

5. refrigerator as claimed in claim 1 or 2 is characterized in that, refrigerating mode when running at the same time, the rotating speed of compressor is a rotating speed high during than common cooling.

6. refrigerator as claimed in claim 1 or 2, it is characterized in that, carry out the refrigerant-recovery mode operation after the refrigerating mode running finishes at the same time, by flow channel switching valve stop cold-producing medium to freezing with cooler and refrigeration with the flowing of cooler, with the refrigerant-recovery in each cooler in compressor.

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