KR20000019107A - Freezing system of refrigerator and control method thereof - Google Patents

Abstract

PURPOSE: A refrigerator freezing system is provided to reduce the operating ratio and the power consumption for the freezing system by improving the efficiency of the freezing system. CONSTITUTION: A freezing system of a refrigerator comprises a refrigerating evaporator(55) to provide a cold wind to the refrigerating chamber. A compressor(51) sucks in the refrigerant passing through the refrigerating evaporator and compresses the refrigerant. Also, an opening/closing valve(57) opens/closes the refrigerant line which connects the refrigerating evaporator and the compressor. Then, a freezing evaporator(59) provides cold air to the freezing chamber, and a freezing fan(60) and a refrigerating fan(56) contains the freezing evaporator and the refrigerating evaporator to absorb heat each other. And then, a first capillary tube(54) reduces refrigerant pressure condensed in the condenser(52).

Description

Refrigeration system of refrigerator and its control method

The present invention relates to a refrigeration system of a refrigerator and a control method thereof, and in particular, a refrigerator evaporator and a refrigerator evaporator for providing cold air to the freezer compartment and the refrigerating compartment, respectively, to maintain the humidity of the refrigerating compartment directly connected to food preservation of the refrigerator, and at the same time. The present invention relates to a refrigerator's refrigeration system and a method of controlling the same, which block air of the refrigerator to prevent food smell from the refrigerator compartment from entering the freezer compartment.

As shown in FIG. 1, a refrigeration system of a refrigerator according to the first embodiment of the prior art has a compressor (1) for compressing a refrigerant and converting the refrigerant into a high temperature and high pressure steam state, and through the compressor (1), A condenser (2) for condensing the refrigerant into a high-pressure liquid state by heat-exchanging the refrigerant, which has become a vapor state, with a high-pressure liquid state, and a refrigerant that has become a high-pressure liquid state through the condenser (2) The capillary tube 4 which depressurizes to be easy to evaporate, and the refrigerant which has become a low-dry state of low temperature and low pressure through the capillary tube 4 exchange heat with the surrounding air to convert the refrigerant into a low temperature and low pressure steam state It comprises an evaporator (5) to reduce the temperature of.

Here, the compressor (1) and the condenser (2) is installed in the machine room of the refrigerator, the condenser (2) is a heat radiating fan (3) for radiating the condenser (2) and the heat radiating fan (3) to power The motor to supply is installed.

In addition, the evaporator 5 is installed at the rear of the freezer compartment of the refrigerator to provide cold air to the freezer compartment and the refrigerating compartment, and the evaporator 5 includes a freezing fan 6 for absorbing the evaporator 5 and the freezing fan 6. A motor is installed to power).

Referring to the operation and effect of the refrigeration system of the refrigerator according to the first embodiment of the present invention configured as described above are as follows.

First, when the refrigerant compressed by the compressor 1 is changed into a vapor state of high temperature and high pressure, and then sucked into the condenser 2, the condenser 2 releases heat to change the refrigerant into a liquid state of normal temperature and high pressure. Thereafter, the refrigerant condensed by the condenser 2 is depressurized while passing through the capillary tube 4, and a part of the refrigerant is depressurized to form a two-phase state in which liquid and gas are mixed. Then, the refrigerant sucked into the evaporator 5 is completely vaporized to take the heat of the surroundings to cool the surroundings, and the air cooled by the evaporator 5 is provided to the freezer compartment and the refrigerating compartment.

However, since the first embodiment of the related art includes only one evaporator 5 and a freezing fan 6 at the rear of the freezing chamber, the cold air supplied by the evaporator 5 and the freezing fan 6 may be stored in the freezing chamber. Distribution and supply to the refrigerating chamber, due to this, the air in the freezer compartment and the refrigerating chamber is mixed with each other there is a problem that the food smell of the refrigerating compartment flows into the freezer compartment.

As shown in FIG. 2, the freezing system of the refrigerator according to the second embodiment of the present invention, which is designed to prevent air mixing between the freezing compartment and the refrigerating compartment, is installed at the rear of the freezing compartment to provide cold air to the freezing compartment. And a refrigeration evaporator 17 connected in parallel with the freezing evaporator 15 and installed at the rear of the refrigerating compartment to provide cold air to the refrigerating compartment, and the freezing evaporator 15 and the refrigerating evaporator 17, respectively. And a variable speed brushless direct current (BLDC) motor that supplies power to the refrigeration fan 16 and the refrigeration fan 18 and the refrigeration fan 16 and the refrigeration fan 18, respectively. Same as the first embodiment.

In the above description, reference numeral 12 denotes a condenser, reference numeral 13 denotes a heat dissipation fan, and reference numeral 14 denotes a capillary tube.

In the refrigeration system of the refrigerator according to the second embodiment of the present invention configured as described above, the operation of the freezer compartment and the refrigerating compartment by adjusting the on / off and the rotation speed of the refrigerating fan 13 and the refrigerating fan 16 during the operation of the compressor 11. To control.

However, according to the second embodiment of the present invention, since the refrigerant is distributed and sucked into the freezer evaporator 15 and the freezer evaporator 17, when only the freezer is operated, the evaporation temperature of the coolant drops to -30 ° C. or lower of the refrigeration system. At the same time as the efficiency is greatly reduced, the refrigerant passing through the refrigerating evaporator 17 of the refrigerating chamber is directly sucked into the compressor 11 without heat exchange, thereby increasing the operation rate and power consumption of the refrigeration system.

In particular, the above phenomenon is more severe when the temperature outside the refrigerator is changed or the loads on the freezer and the freezer compartment of the refrigerator are different, and thus, a refrigeration system and a refrigerating system that can be adapted to various cases in order to compensate for this are Control methods must be introduced.

The present invention has been made to solve the above problems, provided with each of the freezing evaporator and the refrigeration evaporator to provide cold air to the freezer compartment and the refrigerating chamber is sucked into the freezer and refrigerator evaporator according to the operating conditions of the freezer compartment and the refrigerating compartment By appropriately distributing the amount of refrigerant, the stability of the entire refrigeration system is secured. In addition, when the refrigerator is operated only, the evaporation temperature of the refrigerant is increased to improve the efficiency of the refrigeration system and reduce the operation rate and power consumption of the refrigeration system. Its purpose is to provide a refrigeration system and a control method thereof.

1 is a configuration diagram showing a refrigeration system of a refrigerator according to a first embodiment of the prior art,

2 is a configuration diagram showing a refrigeration system of a refrigerator according to a second embodiment of the prior art,

3 is a configuration diagram showing a refrigeration system of a refrigerator according to the present invention;

4 is a flowchart showing an operation sequence when only a refrigerating compartment is operated according to a method for controlling a refrigeration system of a refrigerator according to the present invention;

5 is a refrigerant diagram (pressure-enthalpy diagram) which appears when only a refrigerator compartment is operated according to the present invention;

6 is a flowchart illustrating an operation sequence when only a freezer compartment is operated according to a method for controlling a refrigeration system of a refrigerator according to the present invention;

7 is a refrigerant line diagram when only a freezer compartment is operated according to the present invention.

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

51: compressor 52: condenser

54: first capillary 55: refrigeration evaporator

56: refrigeration fan 57: on-off valve

58: second capillary 59: cryovaporizer

60: refrigeration fan 61: check valve

Features of the refrigerator system of the refrigerator according to the present invention for achieving the above object, the refrigerator evaporator for providing cold air to the refrigerator compartment, a compressor for sucking and compressing the refrigerant passing through the refrigerator evaporator, and the refrigerator evaporator and the compressor An on / off valve installed on the refrigerant line to be connected to open and close the refrigerant line, a freezing evaporator installed on the refrigerant line branched from the front of the on / off valve and joined from the rear to provide cold air to the freezer compartment, and the freezer evaporator and refrigeration It includes a refrigeration fan and a refrigeration fan to endotherm the evaporator, respectively.

In addition, the additional feature of the present invention, the refrigerant line upstream of the refrigeration evaporator prevents the refrigerant from being sucked to the freezing evaporator side when the on-off valve is opened and at the same time the refrigerant sucked to the freezing evaporator side when the on-off valve is blocked. A capillary tube for reducing the pressure is installed, and a check valve is installed at a downstream refrigerant line of the freezing evaporator to prevent the refrigerant from flowing back to the freezing evaporator when the on / off valve is opened.

Next, a first feature of the refrigerator system control method of the refrigerator according to the present invention is a refrigerator system control method including a refrigerator compartment and a freezer compartment. A first process of comparing with a starting temperature (T _on ); A second process of outputting an on-signal of the compressor and the refrigeration fan when T> T _on in the first process, and opening and closing the valve installed on the refrigerant line connecting the compressor and the refrigeration evaporator; A third step of comparing the T with the refrigerating chamber operation stop temperature (T _off ) when the refrigerating fan reaches a predetermined rotational speed and then branching to the second step if T> T _off ; When T≤T _on or T≤T _off in the first process or the third process, a fourth process of outputting off signals of the compressor and the refrigerating fan and returning to the first process is performed.

In addition, a second feature of the refrigerator system control method of the refrigerator according to the present invention is a refrigerator system control method including a refrigerator compartment and a freezer compartment. first comparing the operation starting temperature (T _'on) and; A second step of the process is in the first T '>T' _on output the ON signal of the compressor and the freezing fan and, blocking the opening and closing valve disposed in the refrigerant line connecting the compressor and the refrigerating evaporator and; After the above refrigerating fan compared to when reaching the predetermined number of rotation T 'the freezing operation stop temperature (T' _off), if T '>T' for branching _off a third step in the second step; The first step or a third process in T'≤T _'on or T'≤T' is made _off to the fourth process of returning to the first step and then outputs the OFF signal of the compressor and the freezing fan.

According to the present invention configured as described above, by appropriately distributing the amount of refrigerant sucked into the freezing evaporator and the freezing evaporator according to the operating conditions of the freezer compartment and the refrigerating compartment, the stability of the overall refrigerating system is as well as the evaporation temperature of the refrigerant when the refrigerating compartment is operated only. As it increases, the efficiency of the refrigeration system is improved, and the operation rate and power consumption of the refrigeration system are reduced.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a configuration diagram showing a refrigeration system of a refrigerator according to the present invention, FIG. 4 is a flowchart showing an operation procedure when only a refrigerating compartment is operated according to a method for controlling a refrigeration system of a refrigerator according to the present invention, and FIG. Is a refrigerant diagram (pressure-enthalpy diagram) appearing when only a refrigerating compartment is operated according to the present invention, and FIG. 6 is a flowchart showing an operation sequence when only a freezing compartment is operated according to a method for controlling a refrigeration system of a refrigerator according to the present invention. ego,

7 is a refrigerant line diagram when only a freezer compartment is operated according to the present invention.

Referring to FIG. 3, the refrigerator freezing system according to the present invention includes a refrigerator evaporator 55 providing cold air to a refrigerator compartment, a compressor 51 for sucking and compressing a refrigerant passing through the refrigerator evaporator 55, and On and off valve 57 is installed on the refrigerant line connecting the refrigeration evaporator 55 and the compressor 51 to open and close the refrigerant line, and on the refrigerant line branched in front of the on-off valve 57 and joined from the rear. A freezing evaporator (59) installed to provide cold air to the freezer compartment, a freezing fan (60) and a refrigerating fan (56) for absorbing the freezing evaporator (59) and the refrigerating evaporator (55), and the compressor (51). Condenser 52 for condensing the compressed refrigerant through the condenser 52, and the first capillary tube 54 for reducing the refrigerant condensed through the condenser 52 to supply to the refrigeration evaporator (55).

Here, the refrigerant line upstream of the refrigeration evaporator (59) prevents the refrigerant from being sucked into the freezing evaporator (59) when the on-off valve (57) is opened and at the same time the refrigeration evaporator (off) when the on / off valve (57) is shut off. A second capillary tube 58 for reducing the pressure of the refrigerant sucked into the 59) side is provided.

In addition, a check valve 61 is installed on the downstream refrigerant line of the freezing evaporator 59 to prevent the refrigerant from flowing back to the freezing evaporator 59 when the on-off valve 57 is opened.

In the above, the refrigerator evaporator 55 and the freezer evaporator 59 are respectively installed at the rear of the refrigerator compartment and the freezer compartment of the refrigerator, and the variable speed BLDC motor for supplying power to the refrigerator fan 56 and the refrigerator fan 60 is installed. have.

In addition, the compressor 51 and the condenser 52 are installed in a machine room of a refrigerator, and the condenser 52 provides a heat radiating fan 53 for radiating the condenser 52 and power to the radiating fan 53. The motor to supply is installed.

The refrigeration system of the refrigerator according to the present invention configured as described above is operated as follows.

First, referring to FIG. 4 and FIG. 5, the operation of only the refrigerating compartment will be described. In operation S71, the temperature T inside the refrigerating compartment is detected and compared with the refrigerating compartment operation start temperature T _on . As a result of S71, when T> T _on , the on-signal of the compressor 51 and the refrigerating fan 56 is output in S73, and the on / off valve 57 is opened.

When the on-off valve 57 is opened as described above, the refrigerant passes through the refrigeration evaporator 55, cools the surrounding air to provide cold air into the refrigerating chamber, and is directly sucked into the compressor 51 so that the refrigerant evaporation temperature is-. The temperature rises to about 10 ° C., which is about 16 ° C. higher than the existing one (with only one evaporator), thereby improving the efficiency of the refrigeration system by about 7% and reducing power consumption.

In this case, the refrigerant passing through the refrigerating evaporator 55 is prevented from being sucked into the freezing evaporator 59 by the flow resistance of the second capillary tube 58, and the refrigerant passing through the open / close valve 57 is a check valve ( 61 prevents backflow to the freezing evaporator 59 side, and the freezing fan 60 for absorbing the freezing evaporator 59 is stopped.

Subsequently, when the refrigerating fan 56 reaches a predetermined rotation speed in S75, T is compared with the refrigerating chamber operation stop temperature T _off in S77, and then branches to S73 when T> T _off . In this case, the rotation speed N of the refrigerating fan 56 may be expressed as N = a * (TT _off ) + minimum rotation speed when comparing T and T _off (a: constant).

In the above, as a result of S71 or S77, when T ≦ T _on or T ≦ T _off , the signal S79 outputs the off signals of the compressor 51 and the refrigerating fan 56 and returns to S71. Thereafter, the above process is repeated.

In addition, referring to FIG. 6 and FIG. 7, when only the freezer compartment is operated, the temperature T ′ inside the freezer compartment is sensed in S81 and compared with the freezer compartment operation start temperature T ′ _on . If the result of the above S81, T '>T' _on and outputs the ON signal of the compressor 51 and the freezing fan 60 at S83, and blocks said opening and closing valve 57.

As such, when the on-off valve 57 is blocked, the refrigerant passing through the refrigeration evaporator 55 is sucked into the freezing evaporator 59 through the second capillary tube 58. Thereafter, the refrigerant sucked into the freezing evaporator 59 evaporates to cool the surrounding air to provide cold air in the freezing compartment. At this time, since the refrigerating fan 56 for absorbing the refrigerating evaporator 55 is stopped, there is no heat loss into the refrigerating chamber. That is, when the refrigeration fan 56 is stopped, even if the refrigerant passes through the refrigeration evaporator 55, the state change does not occur.

When operating only the freezer compartment in the above manner, the evaporation temperature of the refrigerant is -26 ° C, which is similar to the existing one (only one evaporator is provided), and thus the same efficiency and power consumption as the conventional refrigeration system (only one evaporator is provided). You will get

Then, if the if the freezing fan (60) reaches a predetermined rotation number in S85 after the comparison, the freezing operation stop temperature (T 'and T _off), T'> T _'off then branches to the S83. At this time, the rotation speed (N ') of the refrigeration fan (60) when comparing the T' and T ' _off can be expressed as N' = b * (T'-T ' _off ) + minimum rotation speed (b: constant ).

The result of S81 or S87, T'≤T _'on or T'≤T' is _off and then outputs the off-signal of the compressor 51 and the freezing fan 60 at S89 thus returns to the S81. Thereafter, the above process is repeated.

Refrigerating system and control method of the refrigerator according to the present invention configured and operated as described above is provided with each freezer evaporator (59) and refrigeration evaporator (55) for providing cold air to the freezer compartment and the refrigerator compartment operating state of the freezer compartment and the refrigerator compartment. By appropriately distributing the amount of refrigerant sucked into the freezer evaporator (59) and the freezer evaporator (55) ensures the stability of the overall refrigeration system, as well as the efficiency of the refrigeration system is increased by the evaporation temperature of the refrigerant when operating only the refrigerator compartment At the same time, the operation rate and power consumption of the refrigeration system are reduced.

Claims (5)

A refrigerating evaporator providing cold air to a refrigerating compartment, a compressor for sucking and compressing a refrigerant passing through the refrigerating evaporator, an on / off valve installed on a refrigerant line connecting the refrigerating evaporator and the compressor to open and close a refrigerant line, A refrigerator provided on a refrigerant line branched from the front of the valve and joined from the rear of the valve to provide cold air to the freezer compartment, and a freezing fan and a refrigerating fan for absorbing the freezing evaporator and the refrigerating evaporator, respectively. Refrigeration system. The method of claim 1, A refrigerator characterized in that a capillary tube is installed at an upstream refrigerant line of the freezing evaporator to prevent the refrigerant from being sucked to the freezing evaporator when the on / off valve is opened, and at the same time, a capillary tube for depressurizing the refrigerant drawn into the freezing evaporator when the on / off valve is blocked. Refrigeration system. The method of claim 1, A refrigeration system of a refrigerator, characterized in that a check valve is installed at a downstream refrigerant line of the freezing evaporator to prevent the refrigerant from flowing back to the freezing evaporator when the on / off valve is opened. In the refrigeration system control method having a refrigerator compartment and a freezer compartment, In the case of operating only the refrigerating compartment, a first process of detecting a temperature (T) inside the refrigerating compartment and comparing it with a refrigerating compartment operation start temperature (T _on ); A second process of outputting an on-signal of the compressor and the refrigeration fan when T> T _on in the first process, and opening and closing the valve installed on the refrigerant line connecting the compressor and the refrigeration evaporator; A third step of comparing the T with the refrigerating chamber operation stop temperature (T _off ) when the refrigerating fan reaches a predetermined rotational speed and then branching to the second step if T> T _off ; In the first process or the third process, if T≤T _on or T≤T _off , a refrigeration of the refrigerator comprising a fourth process of outputting an off signal of the compressor and the refrigeration fan and returning to the first process. System control method. In the refrigeration system control method having a refrigerator compartment and a freezer compartment, In the case of operating only the freezer compartment, a first process of detecting a temperature (T ′) inside the freezer compartment and comparing it with a freezer compartment operation start temperature (T ′ _on ); A second step of the process is in the first T '>T' _on output the ON signal of the compressor and the freezing fan and, blocking the opening and closing valve disposed in the refrigerant line connecting the compressor and the refrigerating evaporator and; After the above refrigerating fan compared to when reaching the predetermined number of rotation T 'the freezing operation stop temperature (T' _off), if T '>T' for branching _off a third step in the second step; T'≤T ' _on or T'≤T' _off in the first or third process, characterized in that the fourth process for returning to the first process after outputting the off signal of the compressor and the refrigeration fan Refrigeration system control method.