KR101651328B1 - Refrigerator and control method the same - Google Patents

Abstract

According to an aspect of the present invention, there is provided a refrigerator comprising: a compressor compressing a refrigerant; A condenser for condensing the refrigerant compressed in the compressor; A valve device for branching the refrigerant condensed in the condenser; And a first branch flow passage branching from the valve device, wherein the first branch flow passage is provided with a first evaporator and a first evaporation expansion device; A second branch flow passage branched from the valve device and provided with a second evaporator and a second evaporation expansion device; An auxiliary condenser installed at the inlet side of the second evaporative expansion device for condensing the refrigerant; And a condensing expansion device installed at the inlet side of the auxiliary condenser for reducing the pressure of the refrigerant condensed in the condenser.

Description

The present invention relates to a refrigerator and a control method thereof,

The present invention relates to a refrigerator and a control method thereof.

Generally, a refrigerator is provided with a plurality of storage chambers for storing foodstuffs to be frozen or refrigerated, and one side of the storage chamber is opened to receive and take out the foodstuffs. The plurality of storage rooms include a freezer room for refrigerated storage of food and a refrigerated room for refrigerated storage of food. In the refrigerator, the refrigeration system in which the refrigerant circulates is driven. The apparatus constituting the refrigeration system includes a compressor, a condenser, an expansion device, and an evaporator.

Patent Document 1 discloses a refrigerator compartment evaporator in which a refrigerator compartment and a freezer compartment are arranged vertically and generates cold air to supply cold air to a refrigerating compartment, a freezer compartment evaporator that generates cold air to supply cold air to the freezer compartment, And a freezing compartment flow path for supplying cold air from the freezing compartment evaporator to the freezing compartment. That is, a refrigerator and a freezer are independently cooled by two condensers and two compressors, and two evaporators are provided.

In this independent refrigerated refrigerator, when cooling for the refrigerating compartment is required, cooling by the evaporator of the refrigerating compartment may be performed, and cooling by the evaporator of the freezing compartment may be performed when cooling of the freezing compartment is required.

However, in the conventional refrigeration system, there is a case where the auxiliary condenser is provided to perform a plurality of condensation processes in the refrigeration cycle, but the cooling efficiency of the main condenser is reduced due to the amount of heat dissipated by the auxiliary condenser.

In order to solve such a problem, the present embodiment aims at providing a refrigerator capable of efficiently cooling by adding an expansion device between a condenser and an auxiliary condenser.

According to an aspect of the present invention, there is provided a refrigerator comprising: a compressor compressing a refrigerant; A condenser for condensing the refrigerant compressed in the compressor; A valve device for branching the refrigerant condensed in the condenser; And a first branch flow passage branching from the valve device, wherein the first branch flow passage is provided with a first evaporator and a first evaporation expansion device; A second branch flow passage branched from the valve device and provided with a second evaporator and a second evaporation expansion device; An auxiliary condenser installed at the inlet side of the second evaporative expansion device for condensing the refrigerant; And a condensing expansion device installed at the inlet side of the auxiliary condenser for reducing the pressure of the refrigerant condensed in the condenser.

A control method of a refrigerator according to one aspect includes a compressor, a condenser, a first evaporator for cooling a first storage chamber, a second evaporator for cooling a second storage chamber, a first evaporator for cooling the first evaporator, And a second evaporative expansion device provided on an inlet side of the second evaporator, wherein the compressor is driven so that the refrigerant passing through the condenser is introduced into the first evaporator And an evaporator of at least one of the first evaporator and the second evaporator; And determining whether or not the temperature of the second storage chamber satisfies a desired temperature. When the temperature of the second storage chamber does not satisfy the desired temperature, the refrigerant is supplied to the inlet side of the second evaporator, And the second evaporator is flowed through the device and the auxiliary condenser.

According to the embodiment of the present invention, there is an advantage that the cooling capacity of the condenser is prevented from being lowered by the auxiliary condenser, thereby increasing the refrigeration effect of the refrigeration cycle.

In addition, since the heat exchange efficiency of the heat exchanger is improved by using phase change material (PCM: Phase Change Material) as the refrigerant, and the cold air can be stored and stored using the refrigerant, the temperature inside the refrigerator can be kept constant .

In addition, since an additional device for increasing refrigeration efficiency is not additionally provided in addition to the expansion device, the internal design of the refrigerator is simple, which is effective for utilizing the storage space.

In addition, since the auxiliary condenser and the auxiliary evaporator are arranged in two columns in the longitudinal direction on the rear wall of the storage compartment, the volume occupied by the condenser and the evaporator is small, and thus the storage compartment volume can be increased.

In addition, two evaporators are disposed in the first branch flow passage, and there is an advantage that the hot-water cooling operation and the cooling operation are simultaneously performed in one cycle.

In addition, the cycle construction is simple and the manufacturing cost is reduced.

1 is a view showing an internal configuration of a refrigerator according to a first embodiment of the present invention.
2 is a system diagram illustrating a refrigeration cycle configuration of a refrigerator according to an embodiment of the present invention.
FIG. 3 is a view illustrating a part of a refrigerator according to an embodiment of the present invention. Referring to FIG.
4 is a cross-sectional view taken along the line I-I in Fig.
5 is a control block diagram according to an embodiment of the present invention.
6 and 7 are flowcharts illustrating a method of controlling a refrigerator according to an embodiment of the present invention.
8 is a graph showing a PH diagram of a refrigerant circulating in a refrigerator according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

1 is a view showing an internal configuration of a refrigerator according to a first embodiment of the present invention.

Referring to FIG. 1, a refrigerator 10 according to a first embodiment of the present invention includes a main body 11 having a front opening and a storage chamber formed inside the main body 11. As shown in FIG. The storage chamber includes a refrigerating chamber 12 and a freezing chamber 13. The refrigerating chamber 12 and the freezing chamber 13 may be partitioned by a partition 14. The refrigerator compartment 12 may be referred to as a "first storage compartment" and the freezer compartment 13 may be referred to as a "second compartment".

The main body 11 includes an outer case 15 forming an outer appearance of the refrigerator 10 and a refrigerating chamber inner case 16 disposed inside the outer case 15 and forming an inner surface of the refrigerating chamber 12. [ And an inner case (not shown) disposed inside the outer case 15 and forming an inner surface of the freezing chamber 13.

The refrigerator 10 further includes a freezing compartment door 21 and a refrigerating compartment door 22 which are coupled to the front of the main body 11 and selectively shield the freezing compartment 13 and the refrigerating compartment 12, can do.

In this embodiment, a bottom freezer type in which a freezing chamber is formed in a lower portion and a refrigerating chamber is formed in an upper portion will be described as an example. However, the idea of the present invention is not limited to the structure of the refrigerator, but may be a top mount type in which a freezing chamber is formed at an upper portion and a refrigerating chamber is formed at a lower side, or a side by side where a freezing chamber and a refrigerating chamber are provided, It is also possible to apply it to the type.

The refrigerating chamber 12 may be provided with a cold discharge unit 18 for discharging the air cooled by the evaporators 150 and 160 (see FIG. 2) to be described later into the refrigerating chamber 12. The cold air discharge unit 18 is provided on the rear side of the refrigerating chamber 12 and may be formed on the refrigerating chamber cover plate 23.

A refrigerator compartment cover plate (not shown) may be provided on the rear side of the freezer compartment 13, on which a cold discharge unit (not shown) for discharging cold air is formed.

2 is a system diagram illustrating a refrigeration cycle configuration of a refrigerator according to an embodiment of the present invention.

 Referring to FIG. 2, a refrigerator 10 according to an embodiment of the present invention includes a plurality of devices for driving a refrigeration cycle.

In detail, the refrigerator 10 includes a compressor 110 for compressing refrigerant, a condenser 120 for condensing the refrigerant compressed in the compressor 110, and a condenser 120 for condensing the refrigerant condensed in the condenser 120 A plurality of evaporators 150, 153 and 160 for evaporating the refrigerant decompressed in the plurality of expansion devices 141, 143 and 145 and a plurality of expansion devices 141, 143 and 145 for expanding the refrigerant in the expansion devices 141, 143 and 145, And an auxiliary condenser 123 for condensing the decompressed refrigerant.

The refrigerator 10 includes a refrigerant pipe 100 connecting the compressor 110, the condenser 120, the expansion devices 141, 143, and 145, and the evaporators 150 and 160 to guide the flow of the refrigerant.

The plurality of evaporators 150, 153 and 160 may include a first evaporator 150 for generating cold air to be supplied to one of the refrigerating compartment 12 and the freezing compartment 13, A second evaporator 160 for generating cold air to be generated and a subsidiary evaporator 153 installed close to the auxiliary condenser 123. The auxiliary condenser 123 and the auxiliary evaporator 153 may be in contact with each other. The first evaporator 150 may be referred to as a " refrigerator-use evaporator " and the second evaporator 160 may be referred to as a " freezer-applied evaporator. &Quot;

The first evaporator 150 generates cold air to be supplied to the refrigerating chamber 12 and may be disposed at one side of the refrigerating chamber 12. The second evaporator 160 generates cold air to be supplied to the freezing chamber 13 and may be disposed at one side of the freezing chamber 13.

The temperature of the cool air supplied to the freezer compartment 13 may be lower than the temperature of the cool air supplied to the refrigerating compartment 12 so that the refrigerant evaporation pressure of the second evaporator 160 may be lower than that of the first evaporator 150 It may be lower than the evaporation pressure of the refrigerant.

The outlet refrigerant pipe 100 of the first and second evaporators 150 and 160 extends toward the inlet of the compressor 110. Therefore, the refrigerant having passed through the first and second evaporators 150 and 160 can be sucked into the compressor 110.

The refrigerator 10 may further include a refrigerating unit 170 surrounding the auxiliary condenser 123 and the auxiliary evaporator 153 and performing heat exchange with the auxiliary condenser 123 or the auxiliary evaporator 153.

The cold storage portion 170 is understood to be indirect cooling means for cooling the refrigerating chamber 12. In detail, the cold storage part 170 includes a case 171 forming a storage space and a coolant storage 172 stored inside the case.

The axial coolant 172 may include a phase change material (PCM) that undergoes a cooling action by a low temperature phase change. In one example, the phase change material may include water or carbon dioxide.

When a phase change material is used as a co-coolant, high-density cold storage can be achieved through a large amount of cold / heat flow while maintaining a constant target temperature during the phase change process. In addition, since the set temperature can be maintained for a long time without external power supply, it can contribute to energy saving.

The auxiliary evaporator 153 is installed in the case 171 of the refrigerating unit 170 and evaporates the refrigerant to store cool air in the refrigerating unit 172. The auxiliary condensing unit 123 converts the refrigerant into the refrigerant, The refrigerant can be condensed by using the cool air stored in the heat exchanger 172. In addition, the auxiliary condenser 123 can directly contact the auxiliary evaporator 153 and perform heat exchange to condense the refrigerant.

The refrigerator 10 includes a first branch flow passage 101 and a second branch flow passage 102 for branching the refrigerant that has passed through the condenser 120. The refrigerator 10 includes a valve device 130 installed in the refrigerant pipe 100 for branching the refrigerant to the first branched flow path 101 or the second branched flow path 102. The valve device 130 may include a three-way valve having one inlet through which the refrigerant is introduced and two outlets through which the refrigerant is discharged. The first outlet is connected to the first branched flow passage 101 and the second outlet is connected to the second branched flow passage 102 and the second branched flow passage 102. [ . According to the control of the valve device 130, at least one outlet of the first or second outlet may be opened to change the flow path of the refrigerant.

The first branch passage (101) is provided with an auxiliary valve that is provided on an outlet side of the first expansion device (141) and the first expansion device (141) and which is used for evaporating the refrigerant decompressed in the first expansion device An evaporator 153 may be provided. The first expansion device 141 may include a capillary.

The refrigerant flows through the first branch flow path 101 and flows into the auxiliary evaporator 153. In the process of evaporating the refrigerant in the auxiliary evaporator 153, the PCM can be cooled. The first expansion device 141 is called a " first evaporation expansion device ".

A first evaporator 150 may be installed in the first branch passage 101 at the outlet of the auxiliary evaporator 153.

The second branch passage 102 may be provided with a third expansion device 145 installed at the inlet side of the second evaporator 160 and the second evaporator 160 to expand the refrigerant. The third expansion device 145 may include a capillary. The third expansion device 145 is referred to as a " second evaporation expansion device ".

The diameter of the capillary of the third expansion device 145 is larger than the evaporation pressure of the refrigerant of the first evaporator 150 so that the refrigerant evaporation pressure of the second evaporator 160 is lower than the refrigerant evaporation pressure of the first evaporator 150, Lt; / RTI > capillary diameter.

The second branch passage 102 is provided with the third expansion device 145 and the auxiliary condenser 123 installed at the inlet side of the third expansion device 145 for condensing the refrigerant and the auxiliary condenser 123, And a second expansion device 143 installed at the inlet side of the condenser 120 for decompressing the refrigerant condensed in the condenser 120. The second expansion device 143 may include a capillary tube and may be referred to as a " expansion device for condensation " in that it performs depressurization for auxiliary condensation.

The refrigerant condensed in the condenser 120 is decompressed in the second expansion device 143 and condensed in the auxiliary condenser 123, thereby increasing the cooling capacity (see FIG. 8).

The valve device 130 can be controlled so that the flow path of the refrigerant changes depending on the operation mode of the refrigerator. Here, the operation mode of the refrigerator includes a "simultaneous operation mode" in which the refrigeration operation of the refrigerating and freezing compartments is performed, a "refrigeration compartment operation mode" Quot; cold storage operation mode " for storing cold air in the cold storage section 170 may be included. The " cold storage operation mode " can be performed simultaneously with the " refrigerating chamber operation mode ".

For example, when the simultaneous operation mode is performed, the valve device 130 may be controlled such that the refrigerant is branched and supplied to the first and second branch flow paths 101 and 102. That is, the valve device 130 may be operated such that both the outlet portions are opened.

As another example, when the refrigerating chamber operating mode is performed, the refrigerant is supplied to the first evaporator 150. [ The valve device 130 may be controlled such that the refrigerant is branched and supplied to the first branched flow path 101. That is, the valve device 130 may be operated to open the first outlet portion connected to the first branched flow passage 101.

When the first outlet portion is opened, the refrigerant is depressurized by the first expansion device 141 through the first branch passage 101, and is flowed to the auxiliary evaporator 153 and evaporated to be supplied to the axial refrigerant 172 And then flows into the first evaporator (150). Next, the refrigerant is evaporated in the first evaporator 150 to absorb the surrounding heat to cool the air.

As another example, when the freezer compartment operation mode is performed, the refrigerant is supplied to the second evaporator 160. The valve device 130 may be controlled so that the refrigerant is branched and supplied to the second branch flow path 102. That is, the valve device 130 may be operated to open the second outlet portion connected to the second branched flow passage 102.

When the second outlet portion is opened, the refrigerant is depressurized by the second expansion device 143 through the second branch passage 102, flows into the auxiliary condenser 123 and is condensed, and then the second evaporator 160 ). Next, the refrigerant is evaporated in the second evaporator 160 to absorb ambient heat to cool the air.

As another example, when the hot-water storage operation mode is performed, the operations of the refrigerant and the valve device 130 are the same as those of the refrigerating chamber operation mode, but differ only in the operation of the evaporation fan to be described later.

The operation mode may be based on whether the indoor temperature of the refrigerator 10 is satisfied, and a specific control method according to whether the indoor temperature is satisfied will be described later with reference to FIG.

Meanwhile, the refrigerator (10) may include a blowing fan (125, 155, 165) provided at one side of the heat exchanger to blow air. The blowing fans 125, 155 and 165 may include a condensing fan 125 provided at one side of the condenser 120, a first evaporating fan 155 provided at one side of the first evaporator 150, And a second evaporation fan 165 provided on one side of the evaporation fan 165.

The heat exchange capacity of the first and second evaporators 150 and 160 may vary according to the rotation speed of the first and second evaporation fans 155 and 165. For example, when a large amount of cold air is generated due to the operation of the first evaporator 150, the rotation speed of the first evaporator fan 155 increases. When the cool air is sufficient, Can be reduced.

FIG. 3 is a view showing a part of a refrigerator according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line I-I of FIG.

3 and 4, a refrigerator 10 according to an embodiment of the present invention includes a machine room 30 formed at a lower portion of the refrigerator 10, A first cooling chamber 31 and a second cooling chamber 32 for supplying cool air to the freezing chamber 13 may be formed. The cool air in the first cooling chamber 31 and the second cooling chamber 32 can be discharged to the freezing chamber 12 and the freezing chamber 13 through the cool air discharge portion 18.

In the machine room 30, a compressor 110 and a condenser 120 may be installed.

The first cooling chamber 31 may be provided on a rear wall of the refrigerating chamber 12 and may be formed between the refrigerating chamber inner case 16 and the refrigerating chamber cover plate 23. The first cooling chamber 31 is provided with the first evaporator 150 and the auxiliary condenser 123 and the auxiliary evaporator 153 provided inside the cooling unit 170 and the cooling unit 170 .

The first evaporator 150 may be in contact with the refrigerator compartment cover plate 23 and may be fixed by a holder (not shown).

The cold storage unit 170 may be in contact with the refrigerating compartment inner case 16 and may be fixed by a holder (not shown). The first evaporator 150 and the cooler 170 may be spaced apart as shown. However, the first evaporator 150 and the cooling unit 170 may be in contact with each other.

The refrigerant pipe 150a of the first evaporator 150 and the refrigerant pipe 153a of the auxiliary evaporator 153 and the refrigerant pipe 123a of the auxiliary condenser 123 may be bent and extended in the vertical direction .

Since the refrigerant pipe 150a of the first evaporator 150 and the refrigerant pipe 153a of the auxiliary evaporator 153 and the refrigerant pipe 123a of the auxiliary condenser 123 are installed close to each other, The installation space of a plurality of apparatuses constituting the cycle can be reduced. Therefore, the storage space of the storage chamber can be prevented from being narrowed.

The second cooling chamber 32 may be provided on a rear wall of the freezing chamber 13 and may be formed between the freezing chamber inner case and the freezing chamber cover plate 24. In the second cooling chamber 32, a second evaporator 160 may be installed.

One side of the first and second evaporators 150 and 160 is provided with a gas-liquid separator 180 for filtering the liquid refrigerant in the refrigerant vaporized in the first and second evaporators 150 and 160 and supplying the gaseous refrigerant to the compressor 110 May be provided, respectively.

FIG. 5 is a control block diagram according to an embodiment of the present invention, and FIGS. 6 and 7 are flowcharts illustrating a method of controlling a refrigerator according to an embodiment of the present invention.

5 to 7, a refrigerator 10 according to an embodiment of the present invention includes a control unit 50, an input unit 41 through which a user or the like can input a desired freezing room temperature and a desired refrigerating room temperature, A refrigerating compartment temperature sensor 42 for sensing the temperature of the refrigerating compartment 12 and a freezing compartment temperature sensor 43 for sensing the temperature of the freezing compartment 13. The refrigerator compartment temperature sensor 42 and the freezer compartment temperature sensor 43 may be referred to as a "first temperature sensor" and a "second temperature sensor", respectively.

The control unit 50 controls the compressor 110, the condensing fan 125, the first evaporation fan 155, and the second evaporation fan 155 according to whether the temperature sensed by the temperature sensors 42 and 43 satisfies the desired temperature. 2 evaporating fan 165 and the valve device 130. [0064]

The control method of the refrigerator 10 according to whether the temperature of the refrigerating compartment 12 is satisfied will be described with reference to FIG.

The operation of the refrigerator is started and a desired temperature is input from the user through the input unit 41 and the temperature of the refrigerating chamber 12 is sensed through the refrigerating room temperature sensor 42 at step S1. The order of the desired temperature input and the temperature sensing may be changed.

(S2) whether the temperature of the refrigerating compartment (12) satisfies the desired temperature by comparing the sensed temperature with the desired temperature through the refrigerating compartment temperature sensor (42). The desired temperature may be the temperature section information without the lower limit. That is, the desired temperature information can be set so that the temperature of the refrigerating chamber 12 can be kept below a specific temperature.

If the temperature of the refrigerating compartment 12 satisfies the desired temperature, the controller 50 controls the refrigeration cycle to be stopped (S3). Specifically, the control unit 50 may control the compressor 110 and the first evaporation fan 155 to stop (S4).

When the refrigeration cycle is stopped as described above, the cooling effect by the refrigeration cycle does not occur, and the internal temperature can be maintained at a certain level by the indirect cooling effect by the cooling unit 170.

On the other hand, when the temperature of the refrigerating compartment 12 does not satisfy the desired temperature, the controller 50 controls the refrigerator 10 to operate in the refrigerating compartment operation mode, and at the same time, . Specifically, the control unit 50 may control the compressor 110 and the first evaporation fan 155 to be driven (S6). In addition, the valve device 130 is controlled to open the first outlet and close the second outlet (S7).

Accordingly, the refrigerant can flow into the auxiliary evaporator 153 and the first evaporator 150. More specifically, when refrigerant decompressed in the first expansion device 141 is evaporated in the auxiliary evaporator 153, a cold storage operation is performed to store cool air in the refrigerant 172, and the refrigerant passes through the auxiliary evaporator 153 A refrigerating chamber operation mode is performed in which a refrigerant is evaporated in the first evaporator 150 and the air flowing into the first cooling chamber 31 is cooled.

When the control according to whether the temperature of the refrigerating compartment 12 satisfies the desired temperature is completed, control according to whether the temperature of the freezing compartment 13 is satisfied can be performed. A specific control method according to whether the temperature of the freezing chamber 13 is satisfied will be described with reference to FIG.

The operation of the refrigerator is started and a desired temperature is inputted from the user through the input unit 41 and the temperature of the freezing chamber 13 is sensed through the freezing room temperature sensor 43 in operation S11. The order of the desired temperature input and the temperature sensing may be changed.

The temperature sensed through the freezer compartment temperature sensor 43 is compared with the desired temperature to determine whether the temperature of the freezer compartment 13 satisfies the desired temperature (S12). The desired temperature information may be set so that the temperature of the freezing chamber 13 can be kept below a specific temperature.

When the temperature of the freezing chamber 13 satisfies the desired temperature, the controller 50 controls the freezing cycle to be stopped (S13). Specifically, the control unit 50 may control the compressor 110 and the first evaporation fan 155 to stop (S4). In addition, the valve device 130 may be controlled to close the first and second outflow portions (S15).

On the other hand, if the temperature of the freezing chamber 13 does not satisfy the desired temperature, the controller 50 controls the refrigerator 10 to operate in the freezing chamber operating mode (S16). Specifically, the control unit 50 may control the compressor 110 and the second evaporation fan 165 to be driven (S17). In addition, the valve device 130 is controlled to open the second outlet and close the first outlet (S18).

Accordingly, the refrigerant can be flowed to the auxiliary condenser 123 and the second evaporator 160. Specifically, the refrigerant decompressed in the second expansion device 143 is condensed in the auxiliary condenser 123, and the refrigerant having passed through the auxiliary condenser 123 is decompressed again in the third expansion device 145 The second evaporator 160 evaporates and cools the air flowing into the second cooling chamber 32. The auxiliary condenser 123 causes condensation of the refrigerant at a lower pressure than the condenser 120. The cooling efficiency can be increased by adding the process of condensing and expanding the refrigerant, and the specific principle is described in Fig.

The control according to whether the temperature of the refrigerating compartment 12 is satisfied or the control according to whether the temperature of the freezing compartment 13 is satisfied may be changed in order and each control method may be performed simultaneously. At this time, when the temperatures of the refrigerating chamber 12 and the freezing chamber 13 do not all satisfy the desired temperature, a simultaneous operation mode in which the refrigerant flows simultaneously to the first and second evaporators 150 and 160 can be performed will be. At this time, the flow of the refrigerant in the refrigerator compartment cooling operation and the freezer compartment cooling operation is described in the refrigerating compartment operation mode and the freezer compartment operation mode, respectively.

8 is a graph showing a P-H diagram of a refrigerant circulating in a refrigerator according to an embodiment of the present invention.

Referring to FIG. 8, R represents a refrigerant cycle in the refrigerating chamber operating mode, and F represents a refrigerant cycle in the freezing compartment operating mode.

When the refrigerator 10 is in the " freezer compartment operation mode ", the refrigeration cycle circulates A- > B-> C-> D, Will cycle A '-> B' -> C-> D '-> E-> F.

 In the refrigerating chamber operating mode, the refrigerant in the state A, which is sucked into the compressor 110, indicates the state B after compression. The state of the refrigerant condensed in the condenser 120 represents C.

The refrigerant vaporized in the auxiliary evaporator 153 and the first evaporator 150 flows into the refrigerant circulating in the state A, .

On the other hand, in the freezer compartment operation mode, the refrigerant in the state A 'drawn into the compressor 110 indicates the state B' after compression. The state of the refrigerant condensed in the condenser 120 represents C.

Next, the refrigerant in the C state passes through the valve device 130 and flows into the second expansion device 143. The refrigerant flowing into the second expansion device (143) and depressurized is in a D 'state.

The refrigerant in the D 'state, which has been depressurized by the second expansion device (143), flows into the auxiliary condenser (123) and is condensed once more. The state of the refrigerant that flows into the auxiliary condenser 123 and is condensed represents E.

Next, the refrigerant in the E state condensed in the auxiliary condenser 123 flows into the third expansion device 145 and is further decompressed one time. The refrigerant flowing into the third expansion device 145 and depressurized is in an F state.

The refrigerant in the F state that has been depressurized by the first expansion device 141 flows into the second evaporator 160 and the refrigerant that has flown into the second evaporator 160 and evaporated shows the state A '. According to this refrigeration cycle, the amount of heat of evaporation on the side of the second evaporator 160 forms h2-h1 '.

The auxiliary condenser 123 performs condensation of the refrigerant at a lower pressure than the condenser 120 and the second expansion device 143 functions as the auxiliary condenser 123 for reducing the amount of heat dissipated by the condenser 120 It is to prevent things.

On the other hand, when the second expansion device 143 is not provided in the refrigeration cycle in the freezing compartment operation mode, the refrigerant in the C state condensed in the condenser 120 and the auxiliary condenser 123 flows into the third expansion device The refrigerant in the G state is evaporated in the second evaporator 160 to be in the A 'state. According to this refrigeration cycle, the amount of heat of evaporation on the side of the second evaporator 160 forms h2-h1.

Therefore, the evaporation heat amount when the second expansion device 143 is provided in the refrigeration cycle is h2-h1 ', and the evaporation heat amount when the second expansion device 143 is not provided is h2-h1, H < / RTI > compared to the case where no provision is made for the case where the second expansion device 143 is provided in the cycle.

Therefore, the operating ability of the refrigerator is improved, and the power consumption can be relatively reduced in comparison with the same driving ability. As a result, the operation efficiency of the refrigerator is improved.

Claims (13)

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed in the compressor;
A valve device for branching the refrigerant condensed in the condenser;
A first branch flow channel branched from the valve device and provided with a first evaporator and a first evaporation expansion device;
A second branch flow passage branched from the valve device and provided with a second evaporator and a second evaporation expansion device;
An auxiliary condenser installed at the inlet side of the second evaporative expansion device for condensing the refrigerant;
A condensing expansion device installed at the inlet side of the auxiliary condenser for reducing the pressure of the refrigerant condensed in the condenser;
An auxiliary evaporator provided on an outlet side of the first evaporative expansion device on the first branch flow path for evaporating the refrigerant depressurized by the first evaporative expansion device; And
And a condenser for exchanging heat with the auxiliary evaporator and the auxiliary condenser,
In this case,
A case in which the auxiliary evaporator and the auxiliary condenser are accommodated; And
And a shaft coolant accommodated in the case to store cold heat. delete The method according to claim 1,
Wherein the auxiliary evaporator and the auxiliary condenser are in contact with each other. The method according to claim 1,
Wherein the valve device comprises:
A three-way valve having one inlet, a first outlet and a second outlet,
The first branched flow path is connected to the first outlet portion,
And the second branched flow path is connected to the second outlet. delete delete delete The method according to claim 1,
main body; And
And a freezing chamber and a freezing chamber provided in the main body,
Wherein the first evaporator and the constrictor are installed on a rear wall of the refrigerating compartment,
And the second evaporator is installed on the rear wall of the freezer compartment. 9. The method of claim 8,
An input unit for receiving a desired temperature of the freezing compartment and the freezing compartment;
A first temperature sensor for measuring the temperature of the refrigerating compartment; And
And a second temperature sensor for measuring the temperature of the freezer compartment. 10. The method of claim 9,
When the temperature sensed by the first temperature sensor does not satisfy the desired temperature of the refrigerator compartment,
Wherein the valve device opens the first outlet and closes the second outlet to guide the refrigerant to flow to the first evaporator. 10. The method of claim 9,
When the temperature sensed by the second temperature sensor does not satisfy the freezer compartment desired temperature,
Wherein the valve device opens the second outlet and closes the first outlet to guide the refrigerant to flow to the auxiliary condenser. A refrigerator comprising a compressor, a condenser, a first evaporator for cooling the refrigerating compartment, a second evaporator for cooling the freezer compartment, and a valve device for guiding the refrigerant condensed in the condenser to at least one of the first evaporator and the second evaporator In the control method,
The compressor is driven so that the refrigerant passing through the condenser flows into the evaporator of at least one of the first evaporator and the second evaporator by the valve device;
Determining whether a temperature of the refrigerating compartment and the freezing compartment satisfies a desired temperature;
Performing a refrigerating chamber operation mode in which the refrigerant flows through the auxiliary evaporator provided at the inlet side of the first evaporator and controls the valve device to flow into the first evaporator if the temperature of the refrigerating chamber does not satisfy the desired temperature ;
Performing a freezing compartment operation mode in which the refrigerant flows through an auxiliary condenser provided at an inlet side of the second evaporator and the valve device is controlled to flow into the second evaporator if the temperature of the freezing compartment does not satisfy the desired temperature Lt; / RTI >
Wherein the auxiliary evaporator and the auxiliary condenser heat-exchange with each other during the refrigerating compartment operation mode, and the refrigerant flows into the auxiliary evaporator to store cool air in the refrigerating compartment. delete

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