KR100826934B1 - Refrigerator and method for control operating thereof - Google Patents

Abstract

A refrigerator is provided to expand a variable temperature range of a variable temperature room, and to control humidity of the variable temperature room. A refrigerator comprises a main body, a plurality of evaporators(21,31,41), a plurality of fans(22,32,42), a converting valve(51) of a refrigerant flow path, and a control unit. The main body is equipped with a plurality of storage rooms including a refrigeration room, a freezing room and a variable temperature room. The evaporators correspond to the storage rooms respectively. The fans are respectively arranged in the storage rooms so as to supply cold air to the storage rooms. The converting valve of the refrigerant flow path converts the refrigerant flow path flowing into the evaporators. The control unit controls the fans and the converting valve of the refrigerant flow path so as to control temperature and humidity of the variable temperature room.

Description

Refrigerator and its operation control method

1 is a configuration of a refrigerant cycle of a conventional refrigerator.

2 is a schematic perspective view showing a refrigerator according to the present invention.

3 is a schematic side cross-sectional view showing a refrigerator according to the present invention.

4 is a configuration of a refrigerant cycle of the refrigerator according to the present invention.

5 is an operation control block diagram of a refrigerator according to the present invention.

6 is a flowchart illustrating an operation control method of a refrigerator according to the present invention.

7 is a view showing the experimental results of the operation control method of the refrigerator according to the present invention.

* Description of symbols on the main parts of the drawings *

13: compressor 20: freezer

21: first evaporator 30: the refrigerating chamber

31: second evaporator 40: temperature variable room

41: third evaporator 22, 32, 42: fan

23,33,43: temperature sensor 50: condenser

51: refrigerant flow path switching valve 52, 53, 54: capillary tube

61 control unit 62 drive unit

The present invention relates to a refrigerator that independently cools a plurality of storage compartments and an operation control method thereof, and more particularly, to a refrigerator that can independently control the temperature and humidity of a temperature variable room and an operation control method thereof.

In general, a refrigerator is applied with a conventional freezing cycle in which a refrigerant is circulated therein, so that when a liquid refrigerant evaporates, it absorbs ambient heat and supplies cold air to a food storage room such as a freezer and a refrigerator to supply various foods. In order to keep fresh for a long time, in recent years, a large amount and a large size to store a large amount of food is a trend.

In addition, the need for fresh storage of food to be kept in recent years has increased, and a refrigerator having a temperature variable room capable of temperature control in a space separately partitioned in a refrigerating chamber has been released.

1 is a configuration of a refrigerant cycle of a conventional refrigerator.

The cooling device employed in the refrigerant cycle includes a compressor (1) for compressing the refrigerant at high temperature and high pressure, a condenser (2) for condensing the compressed refrigerant by heat exchange with the surroundings, and a capillary tube (3) for expanding the condensed refrigerant at low pressure. And a damper (not shown) to open and close the refrigerator compartment evaporator (4) and the freezer compartment evaporator (5) for generating cold air by exchanging the refrigerant expanded at low pressure with the air in the refrigerator, and the cold air duct for introducing cold air into the temperature variable chamber partitioned in the refrigerator compartment. ).

The refrigerator compartment evaporator 4 and the freezer compartment evaporator 5 are respectively installed in the refrigerator compartment and the freezer compartment to independently cool the refrigerator compartment and the freezer compartment, and the refrigerator compartment fan 4a for circulating the cold air passing through the refrigerator compartment evaporator and the freezer compartment evaporator to the refrigerator compartment and the freezer compartment as a whole. And a freezer compartment fan 5a.

When the temperature inside the refrigerator compartment or freezer compartment rises above the set temperature in the refrigerator, the compressor 1 starts to operate. The refrigerator compartment fan 4a and the freezer compartment fan 5a are operated simultaneously with the operation of the compressor 1 to operate the refrigerator compartment and the freezer compartment. It is possible to control the temperature of the temperature variable chamber to the set temperature by cooling the, and by opening and closing the damper to introduce the heat exchanged cold air into the temperature variable chamber by the evaporator provided in the refrigerating chamber.

In this way, if the temperature of the variable temperature chamber and the refrigerating chamber satisfies the set temperature, the refrigerator compartment fan 4a is turned off, and only the freezer compartment 5a is operated alone. If the freezer compartment satisfies the freezing chamber set temperature, the compressor 1 and the freezing compartment fan are (5a) is turned off.

The control of the temperature variable room according to the prior art uses the refrigerator evaporator to control the temperature of the temperature variable room by opening and closing the damper, because the temperature of the refrigerator compartment and the temperature variable room is controlled by using one evaporator. The temperature of the room is varied within -5 ° C to +5 ° C.

This is because the temperature range of the variable room is small, there is a limit to keep a variety of foods that consumers need at the optimum temperature.

In addition, since the cold air that is heat-exchanged becomes dry cold air through the evaporator, especially when it is necessary to store fresh food such as vegetables and fruits in the temperature variable room, the food stored by the dry cold air flowing into the temperature variable room becomes dry and fresh. There is a problem that is lowered.

In addition, when the load of the temperature variable chamber is increased, the driving time of the refrigerating fan is increased to control the temperature of the temperature variable chamber, which leads to an increase in the operating time of the compressor, thereby increasing power consumption.

Accordingly, the present invention is to solve the conventional problems as described above, an object of the present invention is to provide a refrigerator and an operation control method for controlling the humidity of the temperature variable room while expanding the temperature variable range of the temperature variable room. have.

In order to achieve the above object, the present invention provides a main body having a plurality of storage compartments including a refrigerating compartment, a freezing compartment, a temperature variable chamber, a plurality of evaporators corresponding to each of the plurality of storage compartments, and supplying cold air to the plurality of storage compartments. A plurality of fans provided in each of the plurality of storage chambers, a refrigerant flow path switching valve for switching the refrigerant flow paths flowing into the plurality of evaporators, the plurality of fans and the refrigerant for controlling temperature and humidity of the temperature variable chamber. And a control unit for controlling the flow path switching valve.

In addition, the control unit senses whether the temperature of the temperature variable room has reached the set temperature by sensing the temperature of the temperature variable room for temperature control of the temperature variable room, and determines that the temperature of the temperature variable room has reached the set temperature. The refrigerant flow path switching valve is controlled to block the refrigerant flow through the evaporator corresponding to the temperature variable chamber.

In addition, the control unit is characterized in that for supplying moisture to the temperature variable room by driving the fan provided in the temperature variable room reaches the set temperature for a predetermined time to control the humidity of the temperature variable room.

In addition, the refrigerant flow path is characterized in that the evaporator corresponding to the temperature variable chamber and the evaporator corresponding to the refrigerating chamber is provided in parallel, the evaporator corresponding to the freezing chamber is connected in series with the evaporators connected in parallel. .

In another aspect, the present invention provides a plurality of storage compartments including a refrigerating compartment, a freezing compartment, and a temperature variable chamber, a plurality of evaporators corresponding to the plurality of storage compartments, and cold air heat exchanged by the plurality of evaporators to the plurality of storage compartments. In the operation control method of the refrigerator comprising a plurality of fans for supplying, the refrigerant flow path switching valve for switching the refrigerant flow path flowing to the plurality of evaporators, the operation control method of the refrigerator, the step of sensing the temperature variable room temperature, Comparing a temperature and a set temperature, the step of opening and closing the refrigerant passage and the on / off of the fan in the temperature variable room according to the comparison result.

The opening and closing of the refrigerant passage and turning on / off the fan may include closing the refrigerant passage flowing into the temperature variable chamber and turning on the fan for a predetermined time when the sensed temperature of the temperature variable chamber is lower than a set temperature. It is done.

The fan may be turned on for a predetermined time when the set temperature is an image.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic perspective view of a refrigerator according to the present invention, and FIG. 3 is a schematic side cross-sectional view of the refrigerator according to the present invention.

As shown in FIGS. 2 and 3, the refrigerator according to the present invention includes a main body 10 provided with a plurality of storage compartments 20, 30, and 40, and doors 15 that open and close the storage compartments 20, 30, and 40. 16).

The plurality of storage compartments 20, 30, and 40 provided inside the main body 10 may be divided by the vertical partition wall 11 to form the freezing compartment 20 formed on the left side, the refrigerating compartment 30 formed on the upper right side, and the refrigerating compartment 20. It comprises a temperature variable chamber 40 partitioned by a horizontal partition at the bottom. At this time, the horizontal partition 12 partitioning the refrigerating chamber 30 and the temperature variable chamber 40 is filled with a foam material to ensure heat insulation and is provided to be removable in the main body 10. That is, the storage space of the refrigerating chamber 30 and the temperature variable chamber 40 can be adjusted by adjusting the height at which the horizontal bulkhead 12 is installed according to a user's selection.

The temperature variable room 40 refers to a storage room whose temperature can be adjusted in a range of -25.0 ° C to 5.0 ° C. That is, it is provided to be refrigerated and frozen according to the user's selection is formed to increase the refrigerating space or increase the freezing space according to the user's needs.

In the machine room 14 partitioned on the rear side of the lower part of the main body 10, electrical components such as the compressor 13 are installed, and a foam member is filled to maintain insulation between the inner and outer wounds of the main body 10.

A pair of doors 15 and 16 are hingedly coupled to both sides of the main body 10 so as to be rotatable. In this case, a single refrigerating chamber door 16 is provided on the front surface of the refrigerating chamber 30 and the temperature variable chamber 40 so that the refrigerating chamber 30 and the temperature variable chamber 40 can be opened and closed at the same time. Of course, each door may be formed in the overtemperature chamber 40. In addition, a plurality of guards 15a and 16a for forming a storage space are provided in each of the inner surface of the freezing chamber door 15 and the refrigerating chamber door 16.

The freezing chamber temperature sensor 23, the refrigerating chamber temperature sensor 33, and the temperature variable chamber temperature sensor 43 are provided at one point on the wall surface of the freezing chamber 20, the refrigerating chamber 30, and the temperature variable chamber 40. do.

Evaporators 21, 31, and 41 are provided at the rear side of the plurality of storage chambers 20, 30, and 40 for generating cold air. The evaporators 21, 31, and 41 are provided at the rear of the freezer compartment 20. The first evaporator 21 for generating cold air to be supplied to), the second evaporator 31 for generating cold air to be supplied to the refrigerating chamber 30, provided in the rear side of the refrigerating chamber 30, and the temperature variable chamber 40 It is provided on the rear of the) comprises a third evaporator 41 for generating cold air supplied to the temperature variable chamber (40).

In addition, the plurality of fans 22, 32, and 42 are provided in the plurality of storage chambers 20, 30, and 40 to supply the cold air heat exchanged with the plurality of evaporators 21, 31, and 41 to the storage chambers 20, 30, and 40. The plurality of fans 22, 32, and 42 are provided in the freezing compartment 20, and a freezing compartment fan 22 and a refrigerating compartment 30 for supplying cold air heat-exchanged with the first evaporator 21 to the freezing compartment 20. The refrigerator compartment fan 32 for supplying the cold air heat exchanged with the second evaporator 31 to the refrigerating chamber 30, and the temperature-changing cold air provided in the temperature varying chamber 40 to heat exchange with the third evaporator 41. And a temperature variable chamber fan 42 for supplying the chamber 40.

The front of the plurality of evaporators (21,31,41) is provided with a duct having a flow path therein for supplying the heat-exchanged cold air to each storage compartment (20, 30, 40), the duct is provided on the rear of the freezing chamber (20) A first duct (not shown) that covers the first evaporator 21 and the freezer compartment fan 22 is installed, and is provided on the rear side of the refrigerating compartment 30 to cover the second evaporator 31 and the refrigerating compartment fan 32 is installed. It comprises a second duct 34 and a third duct 44 provided on the rear of the temperature variable chamber 40 to cover the third evaporator 41 and the temperature variable chamber fan 42 is installed.

4 is a configuration of a refrigerant cycle of the refrigerator according to the present invention.

As shown in FIG. 4, the refrigerator of the present invention is connected to a compressor 13 for compressing a refrigerant and an outlet pipe of the compressor 13, and heat-exchanges with the surroundings by a condensation fan 54 through the refrigerant 13. Any one of the first, second and third capillaries 52, 53 and 54 and the twelfth and third capillaries 52, 53 and 54 which expand and depressurize and expand the refrigerant passing through the condenser 50 under reduced pressure. First, second, and third evaporators (21,31,41) for receiving a refrigerant passing through the capillary tube and heat-exchanging with the air in each storage chamber (20, 30, 40).

A refrigerant flow path switching valve 51 is provided between the condenser 50 and each of the first, second, third capillaries 52, 53, and 54 to control the direction of the refrigerant passing through the condenser 50. At this time, the refrigerant flow path switching valve 51 is provided as a four-way valve to control the direction of the refrigerant so that the refrigerant can branch to any one of the capillary tubes of the first, second and third capillaries 52, 53, and 54.

A plurality of refrigerant paths connected in parallel are formed between the refrigerant flow path switching valve 51 and the first evaporator 21. The refrigerant paths include a first refrigerant having a first capillary tube 52 and a second evaporator 31 in the middle. Pass (I), the second refrigerant pass (II) provided with the second capillary tube 53 and the third evaporator 41 in the middle, and the third refrigerant pass (III) provided with the third capillary tube 54 in the middle Include. The outlet sides of the first, second, and third refrigerant passes I, II, and III are connected to join and extend to the inlet side of the first evaporator 21.

In addition, a freezer compartment fan 22, a refrigerating compartment fan 32, and a temperature variable chamber fan 42 are installed on the first, second, and third evaporators 21, 31, and 41 for circulation of cold air.

Therefore, the refrigerant 13 flows into the condenser 50 by the operation of the compressor 13, and the refrigerant path and the refrigerant path of any one of the first, second, and third refrigerant paths I, II, and III are transferred by the refrigerant flow path switching valve 51. 1 is passed through the evaporator (21). Such refrigerant flows back to the compressor 13 to form a refrigerant cycle.

Meanwhile, in FIG. 4, a four-way valve is used as the refrigerant flow path switching device for controlling the direction of the coolant. However, a plurality of three-way valves may be disposed as necessary.

5 is an operation control block diagram of a refrigerator according to the present invention, in addition to the apparatus shown in FIGS. 2 to 4, the target temperatures Trset, Tcset, and the refrigerating chamber 30, the temperature variable chamber 40, and the freezing chamber 20, respectively. And a temperature setting unit 60 for setting Tfset, a control unit 61 for controlling the devices of the refrigerator, and a driver 62 for driving the devices of the refrigerator.

The control unit 61 is a microcomputer that controls the overall operation of the refrigerator. The refrigerator compartment 30, the temperature variable chamber 40, and the freezer compartment detected by the refrigerator compartment 30, the temperature variable chamber 40, and the freezer compartment temperature sensor 23. Receive the internal temperature of the (20) and compare with the user set temperature (Trset, Tcset, Tfset), and according to the comparison result to independently cool each of the refrigerating chamber (30), temperature variable room (40), freezer compartment (20) To control the driving.

In addition, the controller 61 controls the first, second, and third refrigerant paths through the control of the refrigerant flow path switching valve 51 during the operation control for cooling the refrigerating chamber 30, the temperature variable chamber 40, and the freezing chamber 20. The direction of the coolant is controlled by opening either one and closing the other.

In addition, the controller 61 closes the second refrigerant path II and opens the third refrigerant path III through the control of the refrigerant flow path switching valve 51 when the temperature variable chamber 40 reaches the set temperature. Then, the temperature variable chamber fan 42 is driven for a predetermined time to control the humidity in the temperature variable chamber 40.

In addition, the driving unit 62 is a freezing chamber fan 22, a refrigerating chamber fan 32, a temperature variable chamber fan 42, a condensation fan 54, a compressor 13, and a refrigerant flow channel switching valve according to a control signal of the control unit 61. Drive 51.

Hereinafter, the operation process and the effect of the refrigerator and the operation control method configured as described above will be described.

6 is a flowchart illustrating an operation control method of a refrigerator according to the present invention.

First, when the user sets the control target temperatures (Trset, Tcset, Tfset) of the refrigerating chamber 30, the temperature variable chamber 40 and the freezing chamber 20, the refrigerating chamber 30, the temperature variable chamber 40 and the freezing chamber 20 ) Is detected by the refrigerating chamber temperature sensor 33, the temperature variable room temperature sensor 43, and the freezing chamber temperature sensor 23 to determine whether the compressor 13 is in an operating condition (S100 to S110).

The operating conditions of the compressor 13 are determined according to the internal temperature of the compressor, and the refrigerator compartment temperature Tr sensed by the refrigerator compartment temperature sensor 33 is higher than the refrigerator compartment set temperature Trset or detected by the temperature variable room temperature sensor 43. The case where the temperature variable room temperature Tc is higher than the temperature variable room set temperature Tcset or the freezer compartment temperature Tf detected by the freezer compartment temperature sensor 23 is higher than the freezer compartment set temperature Tfset.

The refrigerator compartment set temperature Trset is the control target temperature of the refrigerator compartment 30, the temperature variable chamber set temperature Tcset is the control target temperature of the temperature variable chamber 40, and the freezer compartment set temperature Tfset is the freezer compartment 36. As the control target temperature, the user may adjust in multiple stages through a temperature controller or a button of the temperature setting unit 60.

If the compressor 13 is in an operating condition, the controller 61 turns on (operates) the compressor 13 through the driver 62. Simultaneously with the operation of the compressor 13, the control unit 61 turns on (operates) the condensation fan 54, the refrigerating chamber fan 32, and the freezer compartment fan 22, turns off the temperature variable chamber fan 42 (stops), and cools the refrigerant. The flow path switching valve 51 controls the first refrigerant path I to open and the second and third refrigerant paths II and III to be closed (S120), so that the second evaporator 31 provided with the refrigerant in the refrigerating chamber 30 is provided. Through) to flow in the direction of the first evaporator 21 provided in the freezing chamber (20).

During the cooling of the refrigerating compartment 30, the refrigerating compartment temperature sensor 33 checks whether the refrigerating compartment temperature Tr reaches the set temperature Trset (S130), and when the refrigerating compartment 30 conditions are satisfied, the control unit 61 controls the compressor. 13, the temperature variable chamber fan 42 is turned on in the operation state of the condensation fan 54 and the freezing chamber fan 22, the refrigerating chamber fan 32 is turned off, and the refrigerant flow path switching valve 51 is driven to Close the three refrigerant paths (I, III) and open the second refrigerant path (II) so that the refrigerant passes through the third evaporator 41 provided in the temperature variable chamber 40 and the first evaporator 21 provided in the freezing chamber 20. To flow in the (S140) direction.

Subsequently, by checking whether the temperature variable room temperature Tc reaches the set temperature Tcset through the temperature variable room temperature sensor 43 while cooling the temperature variable room 40 (S150), the temperature of the temperature variable room 40 When the condition is satisfied, the control unit 61 keeps the temperature variable chamber fan 42 on and the refrigerating chamber fan 32 in the operating state of the compressor 13, the condensation fan 54, and the freezer compartment fan 22. The refrigerant flow path switching valve 51 is driven to close the first and second refrigerant paths I and II, and the third refrigerant path III is opened to allow the refrigerant to pass through the third capillary tube 54 to the freezing chamber 20. It is to flow in the direction of the first evaporator 21 provided (S160).

During the operation as described above, the refrigerant does not flow into the third evaporator 41 provided in the temperature variable chamber 40, but the temperature variable chamber fan 42 is kept in an on state, and thus is implanted in the third evaporator 41. As frost or moisture is naturally defrosted by the operation of the temperature variable chamber fan 42, moisture is introduced into the temperature variable chamber 40, thereby increasing the humidity of the temperature variable chamber 40.

This natural defrost time is continued for a predetermined time, it is determined whether the natural defrost time, that is, the sieve closing the second refrigerant path, the time for driving the temperature variable chamber fan 42 has passed a predetermined time (S170), natural defrost time When it is determined that this predetermined time has elapsed, the compressor 13, the condensation fan 54, the freezer compartment fan 22 and the refrigerating compartment fan 32 are kept off, and the temperature variable chamber fan 42 is turned off. (S180)

For a predetermined time for natural defrosting, preferably, the controller 61 stores a predetermined time (for example, about 5 minutes) in advance, or the temperature of the third evaporator 41 of the temperature variable room 40 is a predetermined temperature ( For example, it can be operated for a predetermined time when the temperature is -2 ° C or less.

In addition, when the humidity control is required in the temperature variable room 40 as described above, it is for fresh preservation of food, and thus the operation as described above is limited only when the user sets the temperature of the temperature variable room 40 to 0 ° C or higher. Humidity can be provided to the temperature variable room 40 through the control, and in the case of below zero, the natural defrosting operation control may be omitted.

During the cooling of the freezer compartment 20, the freezer compartment temperature sensor 23 checks whether the freezer compartment temperature Tf reaches the set temperature Tfset (S190). When the freezer compartment 20 temperature condition is satisfied, the controller 61 controls the compressor. (13), the condensation fan 54 and the freezer compartment fan 22 are turned off to terminate the operation of the refrigerant cycle. After a predetermined time has elapsed, the refrigerator compartment temperature Tr, the freezer compartment temperature Tf, and the temperature variable room temperature Tc are again stored in the refrigerator compartment temperature sensor 33, the freezer compartment temperature sensor 23, and the temperature variable room temperature sensor 43. ) And continue to detect the operation condition of the compressor 13 (S100-S110), and repeats the above series of processes.

7 is a view showing the experimental results of the operation control method of the refrigerator according to the present invention.

When fresh vegetables and the like are stored in the temperature variable room 40, as shown in FIG. 7, the humidity in the temperature variable room during the control of the refrigerating room and the temperature variable room to the set temperature (from section 0 to B) in the prior art is When the temperature variable room satisfies the set temperature condition (after section B), the damper of the temperature variable room cold air duct is closed to limit the inflow of cold air into the temperature variable room, and the humidity in the temperature variable room is linear. It gradually increases with low slope.

However, as in the present invention, the natural defrosting operation control maintains a relatively high humidity state because there is no inflow and outflow of cold air into the temperature varying chamber 40 until the temperature control section (0 to A section) of the refrigerating chamber. In the section (AB section) for the temperature control of the humidity of the temperature variable room 40 is lowered so that dry cold air is introduced, but when the temperature variable room 40 satisfies the set temperature, natural defrosting operation control is performed for a predetermined time. Since the moisture is supplied to the temperature variable chamber 40 in progress (BC section), the temperature variable chamber 40 can maintain a high level of humidity compared to the prior art, and when the natural defrosting operation control for a predetermined time is completed, Since the operation of the compressor 13 and the temperature variable room fan 42 is terminated, there is no outflow of cold air, so that the temperature variable room 40 can maintain the moisture supplied during the natural defrosting operation control to maintain a high humidity state. It becomes possible.

Therefore, the present invention can maintain a high humidity in the temperature variable room compared to the prior art has the effect of maintaining the freshness of fresh vegetables, fruits and the like for a long time.

In addition, since a separate independent evaporator is used for cooling the temperature variable room, it is possible to set the temperature of the temperature variable room to various temperatures according to the user's preference by expanding the temperature variable width of the temperature variable room.

In FIG. 6, the cooling of the plurality of storage chambers 20, 30, and 40 in the order of the refrigerating chamber 30, the temperature variable chamber 40, and the freezing chamber 20 has been described as an example, but the cooling order may be changed as necessary. Can be.

As described above, according to the refrigerator and its operation control method according to the present invention, the temperature and humidity of the temperature variable room is controlled through a natural defrosting operation control of closing the second refrigerant flow path and driving the temperature variable chamber fan for a predetermined time. It can work.

In addition, by using a separate third evaporator for cooling the temperature variable room, it is possible to enlarge the temperature variable width of the temperature variable room to set the temperature of the temperature variable room so as to meet various preferences of the user.

Claims (7)

A main body having a plurality of storage compartments including a refrigerating compartment, a freezing compartment and a temperature variable chamber; A plurality of evaporators corresponding to each of the plurality of storage chambers; A plurality of fans provided in each of the plurality of storage compartments to supply cold air to the plurality of storage compartments; A refrigerant flow path switching valve for switching the refrigerant flow paths flowing into the plurality of evaporators; A control unit for controlling the plurality of fans and the refrigerant flow path switching valve to control temperature and humidity of the temperature variable room; Including, The controller determines whether the temperature of the temperature variable room has reached the set temperature by sensing the temperature of the temperature variable room for temperature control of the temperature variable room, and if it is determined that the temperature of the temperature variable room has reached the set temperature The refrigerant flow path switching valve is controlled to block the refrigerant flow path flowing to the evaporator corresponding to the temperature variable chamber, and the fan provided in the temperature variable chamber at which the set temperature is reached for a predetermined time for humidity control of the temperature variable chamber. And supplying moisture to the temperature variable room by driving the refrigerator. delete delete The evaporator of claim 1, wherein the evaporator corresponding to the temperature varying chamber and the evaporator corresponding to the refrigerating chamber are provided in parallel, and the evaporator corresponding to the freezing compartment is connected in series with the evaporators connected in parallel. Refrigerator, characterized in that. A plurality of storage chambers including a refrigerating chamber, a freezing chamber and a temperature variable chamber, a plurality of evaporators corresponding to the plurality of storage chambers, a plurality of fans for supplying cold air heat exchanged by the plurality of evaporators to the plurality of storage chambers, In the operation control method of the refrigerator comprising a refrigerant flow path switching valve for switching the refrigerant flow path flowing to a plurality of evaporators, Detecting the temperature variable room temperature; Comparing the detected temperature variable room with a set temperature; And opening and closing the refrigerant passage and turning on / off the fan of the temperature variable room according to the comparison result.  The opening and closing of the refrigerant passage and turning on / off the fan may include closing the refrigerant passage flowing into the temperature variable chamber and turning on the fan for a predetermined time when the sensed temperature of the temperature variable chamber is lower than a set temperature. Operation control method of the refrigerator. delete The method of claim 5, wherein the turning on the fan for a predetermined time is performed when the set temperature is an image.

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