KR100348068B1 - Controlling method of refrigerator - Google Patents

Abstract

The present invention relates to a defrosting control method of an evaporator in a refrigerator, and comprises a refrigeration evaporator after a predetermined time (T1) has elapsed since the refrigerant flows only in the evaporator (52) by switching the three-way valve (68). When 50) is lower than the predetermined temperature D1, as in the defrosting operation of the refrigerating evaporator 50, defrosting is performed at an appropriate time to prevent cooling deterioration due to unnecessary defrosting or excessive sticking. It is characterized by providing a control method.

Description

CONTROLLING METHOD OF REFRIGERATOR}

The present invention relates to a control method of a refrigerator.

Conventional refrigerators have a refrigerator compartment, a vegetable compartment and a freezer compartment, but there is one evaporator of a refrigeration cycle for cooling the chamber. Therefore, defrosting of the evaporator was determined by the operation time of the compressor. Specifically, when the integration operation time of the compressor exceeds a certain time, the defrosting heater installed in the evaporator is heated to defrost.

By the way, the time for starting the defrosting operation has been set experimentally based on a condition in which a lot of loads such as food containing a lot of water are stored, and the inside of the refrigerator has a high temperature and high humidity and a lot of opening and closing of the door.

However, the amount of frost on the evaporator is determined by the moisture generated from the load inside the refrigerator and the amount of external air invading when opening or closing the door. Therefore, when the load containing moisture is low, or when the low temperature, low humidity, and door opening and closing are low, the frost is more than necessary. There was a problem that the removal was carried out to increase the temperature in the refrigerator.

On the contrary, when the load has a lot of moisture or there is a high temperature, high humidity, and door opening and closing, there is a problem that the evaporator is blocked by over-adhesion, causing cooling deterioration.

Therefore, the present invention relates to defrosting of an evaporator, and provides a control method of a refrigerator that performs defrosting when appropriate and prevents deterioration of cooling due to unnecessary defrosting or overadhesion.

1 is a front view of a refrigerator showing one embodiment of the present invention;

2 is a front view of a cabinet in the same open state;

3 is a longitudinal sectional view at the rear of the cabinet of the refrigerator;

4 is a cross-sectional view taken along the line A-A in FIG.

5 is a layout view of each device constituting the refrigeration cycle,

6 is a block diagram showing a refrigerant passage;

7 is a block diagram of an electric system of a refrigerator;

8 is a flowchart showing a control state of the defrosting operation of the refrigerating evaporator;

9 is a timing chart when no defrosting operation is performed;

10 is a timing chart when frost driving is performed.

* Explanation of symbols for the main parts of the drawings

10: refrigerator 12: cabinet

14: Refrigerating room 16: Vegetable room

18: temperature conversion room 20: ice making room

22: freezer 50: refrigeration evaporator

52: refrigeration evaporator 54: refrigeration blower

56: refrigeration blower 96,98: defrosting heater

100: control unit 102: temperature sensor

In the control method of the refrigerator of claim 1 of the present invention, the main body of the refrigerator is partitioned up and down by a heat insulating partition body, and divided into a refrigeration space and a freezing space, and in the refrigerating space, a first refrigerating compartment and a second refrigerating compartment are sequentially installed from above. In the freezing space, a freezing compartment is installed, a refrigerating evaporator for the first refrigerating compartment and a second refrigerating compartment, and a refrigerating evaporator for the freezing compartment. In a refrigerator provided with a three-way valve for converting the refrigerant in the compressor into a second refrigerant flow that flows only in the freezing evaporator, the refrigerator evaporator after a predetermined time elapses from the start of the second refrigerant flow Is lower than a certain temperature, defrost operation of the refrigeration evaporator is performed.

The control method of the refrigerator is for refrigerating when the three-way valve is switched to start the flow of the second refrigerant, that is, when the refrigerant flows only in the freezing evaporator, and when the refrigerating evaporator is lower than the predetermined temperature after a certain time. Perform defrost operation of the evaporator.

This is because the refrigeration evaporator after a certain time is lower than a certain temperature can be judged that an over-adhesive state is occurring in the refrigeration evaporator, so defrosting is performed. On the other hand, if the temperature is higher than the predetermined temperature, it is determined that the amount of defrosting is small, so defrosting is not performed.

In addition, in order to increase the precision of defrosting determination, the refrigeration blower may be installed in the refrigerating evaporator, and the refrigeration blower may be driven from the start of the second refrigerant flow by switching the three-way valve.

EMBODIMENT OF THE INVENTION Hereinafter, one Example of this invention is described based on FIGS.

1 is a front view of the refrigerator 10 of the present embodiment, and FIG. 2 is a front view of each door of the refrigerator 10 in an open state.

First, the structure of the refrigerator 10 is demonstrated based on FIG. 1 and FIG.

In the cabinet 12, which is the main body of the refrigerator 10, the refrigerating chamber 14, the vegetable chamber 16, the temperature switching chamber 18, and the freezing chamber 22 are provided from the upper end. In addition, an ice making chamber 20 is provided on the left side of the temperature switching chamber 18. And the heat insulation partition body 24 is arrange | positioned between the vegetable chamber 16, the temperature switching chamber 18, and the ice-making chamber 20. As shown in FIG.

The refrigerator compartment 14 is provided with the refrigerator compartment door 14a which opens and closes by a hinge. In addition, a chilled chamber 26 is provided in the lower portion of the refrigerating chamber 14 to maintain the temperature in the refrigerator at about 0 ° C.

The vegetable chamber 16 is provided with a pullout type vegetable chamber door 16a, which can be pulled out of the vegetable container 28 together with the door.

The temperature conversion chamber 18 is provided with a pull-out type temperature conversion door 18a, and the temperature conversion room container 30 can be taken out together with the door.

A freezing chamber door 22a of a pull-out type is installed in the freezing chamber 22, and the freezing container 32 can be taken out together with this door.

As shown in FIG. 4, the ice-making chamber 20 is provided with the ice-making apparatus 34 near the ceiling, and the ice storage container 36 is provided below this.

The ice making device 34 includes an ice making plate 38, a driving unit 40 for rotating it, and an ice making lever 42 for detecting the amount of ice in the ice storage container 36. In addition, a tank 44 for supplying water to the ice making plate 38 is provided on the left side of the chilled chamber 26.

Next, the structure of the refrigeration cycle of the refrigerator 10 and its arrangement will be described based on FIGS. 3 to 6.

First, as shown in FIG. 4, the compressor 46 is provided in the machine room 48 provided in the bottom part of the cabinet 12, ie, the lower back part of the freezer compartment 22. As shown in FIG.

There are two evaporators of the refrigerator 10 for refrigeration and freezing, and the refrigeration evaporator 50 is disposed at the rear of the vegetable chamber 16, and the freezing evaporator 52 is installed at the rear upper portion of the freezing chamber 22. have. A refrigeration blower 54 is provided above the refrigeration evaporator 50, and a refrigeration blower 56 is provided above the refrigeration evaporator 52. In addition, a defrosting heater 96 is provided below the refrigeration evaporator 50. Defrost heater 98 is provided below the freezing evaporator 52.

Moreover, above the refrigeration evaporator 50, the temperature sensor 102 for detecting the temperature of the said refrigeration evaporator 50 is provided.

However, the left side wall and the bottom plate of the temperature conversion chamber 18 are made of a heat insulating structure. Thereby, even if the internal temperature of the temperature switching chamber 18 is set to the same temperature as the refrigerating chamber, the temperature influence from the freezing chamber 22 or the like existing in the surroundings is not affected. In addition, since the back plate of the temperature conversion chamber 18 also has a heat insulating structure, it is not affected by the temperature from the freezing evaporator 52.

Moreover, the condenser 62 is bent several times as shown in FIG. 5, and is comprised in plate shape, and as shown in FIG. 4, it is arrange | positioned under the bottom of the freezer compartment 22. As shown in FIG. The accumulator 74 is attached to the right side of the freezing evaporator 52 as shown in FIG. 3.

FIG. 5 schematically illustrates the arrangement of the refrigeration cycle apparatus, and FIG. 6 is a block diagram showing the refrigerant passage. Hereinafter, the flow of the coolant will be described based on FIG. 5 and FIG. 6.

The refrigerant from the compressor 46 reaches the three-way valve 68 via the muffler 58, the heat dissipation pipe 60, the condenser 62, the defrost pipe 64, and the dryer 66. In the three-way valve 68, the refrigerant flow path branches, one toward the refrigeration capillary tube 70, and the other toward the refrigeration capillary tube 72. It reaches the refrigeration evaporator 50 mentioned above from the refrigeration capillary tube 70, becomes one with the exit side of the refrigeration capillary tube 72, and reaches the said refrigeration evaporator 52 mentioned above. Thereafter, the accumulator 74 and suction pipe 76 are returned to the compressor 46.

When the refrigerating chamber 14, the vegetable chamber 16, the freezing chamber 22 and the ice making chamber 20 are cooled, the three-way valve 68 cools the refrigerant to the refrigerating evaporator 50 and the compressor 40. It switches to the direction which flows to both sides of the freezing evaporator 52. Hereinafter, the flow of the refrigerant is referred to as a first pattern. In addition, in the flow of the refrigerant of the first pattern, both the refrigerating blower 54 and the refrigerating blower 56 are rotated to send cool air to each room.

In addition, in the case where the refrigerator compartment 14 and the vegetable compartment 16 are not cooled, and only the ice making chamber 20 and the freezing compartment 22 are cooled, the three-way valve 68 is switched and the refrigerant flows only in the freezing evaporator 52. . Hereinafter, the said pattern is called 2nd pattern. In the flow of the refrigerant of the second pattern, only the freezing blower 56 is rotated to cool the freezing chamber 22 or the ice making chamber 20.

Next, the flow of cold air in the refrigerating cycle having the above configuration will be described with reference to FIGS. 3 and 4 of the refrigerator 10.

First, the flow of cold air cooled by the refrigeration evaporator 50 will be described.

The cold air cooled by the refrigerating evaporator 50 is sent to the refrigerating branch space 78 located at the rear of the vegetable chamber 16 by the refrigerating blower 54. The upper portion of the refrigerating branch space 78 is connected to the refrigerating duct 80 provided on the rear surface of the refrigerating chamber 14 and cold air is sent to the refrigerating duct 80. As shown in FIG. 3, the refrigeration duct 80 is divided into two at the lower part of the refrigerating chamber 14, and is substantially U-shaped. A cold air outlet 82 is provided on the front surface of the refrigeration duct 80 at predetermined intervals, and cold air is blown from the air outlet 82 to the refrigerating chamber 14. The cold air having cooled the refrigerating compartment 14 passes through the chilled chamber 26 and the lower side of the tank 44 (see FIG. 4), and the return duct 84 provided on the left and right sides of the refrigerating blower 54 and the refrigerating evaporator 50. ) And blows downward of the refrigeration evaporator 50. The cold air is cooled again in the refrigeration evaporator 50 to reach the location of the refrigeration blower 54.

On the other hand, in the refrigeration branch space 78, cold air is blown toward the rear lower portion of the vegetable compartment 16 to cool the vegetable compartment 16 (see FIG. 4). This cold air flows forward from behind the bottom of the vegetable container 28 and leads to the return duct 88 provided in the upper partition body 86 which partitions the refrigerator compartment 14 and the vegetable compartment 16 (refer FIG. 4). ). The return duct 88 is connected to the return duct 84 described above, and the cold air cooling the vegetable chamber 16 also circulates below the refrigeration evaporator 50 (see FIG. 3).

Next, the flow of cold air cooled by the freezing evaporator 52 will be described.

The freezing blower 56 cooled by the freezing evaporator 52 reaches the freezing branch space 90. The upper portion of the freezing branch space 90 passes through the ice making unit 34, and the cold air is blown into the ice making unit 34 from the upper portion. In addition, a lower portion of the freezing branch space 90 passes through a hole 33 opening in the rear plate of the freezing chamber 32 of the freezing chamber 22, and cold air blows from the lower portion toward the inside of the freezing vessel 32. Lose.

The cold air cooling the ice making chamber 20 flows to the front surface of the freezing chamber 22, and the cold air cooling the inside of the freezing chamber 32 of the freezing chamber 22 flows to the front surface of the freezing chamber 22. The cold air flows downward along the front surface of the freezing container 32 and passes through the bottom to the return duct 92. Cold air flowing into the return duct 92 is circulated to the freezing evaporator 52.

The right side of the freezing branch space 90 is provided with a damper device 94 for sending cold air to the temperature conversion chamber 18 and the amount of cold air to be sent to the temperature conversion chamber 18 by opening and closing the damper of the damper device 94. Adjust the temperature in the temperature conversion room. The cold air that has cooled the temperature conversion chamber 18 flows from the bottom of the temperature conversion chamber 18 into the return duct 95 passing through the freezing evaporator 52 and circulated to the freezing evaporator 52.

Next, the structure of the control system in the refrigerator 10 will be described based on FIG. 7.

The control part 100 of this refrigerator 10 consists of a microcomputer, and is installed in the upper part of the back surface of the cabinet 12 as shown in FIG.

As illustrated in FIG. 7, the controller 100 includes a compressor 46, a three-way valve 68, an ice maker 34, a refrigerator blower 54, a refrigerator blower 56, and a refrigerator evaporator 50. Defrost heater 96, defrost heater 98 of refrigeration evaporator 52 and temperature sensor 102 of refrigeration evaporator 50 are connected.

In the refrigerator 10 having the above-described configuration, a control method for defrosting the refrigeration evaporator 50 will be described based on the flowchart of FIG. 8 and the timing charts of FIGS. 9 and 10.

In step 1, when the three-way valve 68 is switched and flow of the refrigerant of the second pattern is reached, step 2 is reached, and in the case of the flow of the refrigerant of the first pattern, the process ends. That is, only the ice-making chamber 20 and the freezing chamber 22 are cooled by the flow of the refrigerant of the second pattern. The refrigerant evaporates in the refrigeration evaporator 50. Therefore, this refrigerator evaporator 50 heat-exchanges with the air in the vegetable compartment 16 and the refrigerator compartment 14, and temperature rise starts.

In step 2, it is detected whether or not the predetermined time T1 has elapsed since the flow of the coolant of the second pattern is started, and if so, the flow advances to step 3; otherwise, the state of this step is continued. It is about 10 minutes as this time T1.

If the temperature of the refrigerating evaporator 50 is below a predetermined temperature D1 (0 degreeC) in step 3, it will progress to step 4 and start defrost operation. On the other hand, if it is more than fixed temperature D1, it completes without starting defrosting operation. This means that if the refrigeration evaporator 50 does not rise in temperature above D1, it is determined that the amount of adhesion to the castle is large, and the defrosting is started. As a result, the optimum defrosting timing can be determined.

9 is a timing chart when the defrosting operation which has risen above a certain temperature D1 after a predetermined time T1 is not started, and FIG. 10 is a refrigerating evaporator having a predetermined temperature D1 or more after a predetermined time T1. Since the temperature of 50) does not rise, this is a timing chart when defrosting operation is started. Here, T2 is the time in the flow of the coolant of the first pattern and T3 is the time of the coolant flow in the second pattern.

As a result, over-adhesive frost does not occur in the refrigerating evaporator 50, and when it is unnecessary, defrosting operation is not performed.

Next, an example of a change of the control method will be described.

In this modified example, when it is determined in step 1 of FIG. 8 that the refrigerant of the second pattern flows, the refrigeration blower 50 is operated for a predetermined time T1. As a result, heat exchange between the refrigerator evaporator 50, the refrigerating chamber 14, and the vegetable chamber 16 is promoted, the temperature rises when the adhesion to the frost is small, and the temperature rise decreases when the adhesion to the frost is large. Crystal precision is improved.

According to the control method of the refrigerator of the present invention as described above, it is possible to accurately determine the frost attachment time, the deterioration of cooling due to the over adhesion of the refrigerating evaporator and frost is not attached more than necessary, thereby reducing the chance of temperature rise. Food preservation performance is improved.

Claims (5)

The main body of the refrigerator is partitioned up and down by a heat insulating partition, divided into a refrigeration space and a freezing space, In the refrigerating space, the first refrigerating compartment and the second refrigerating compartment are installed in order from above, and the freezing compartment is installed in the freezing compartment. A refrigerator evaporator for the first refrigerator compartment and a second refrigerator compartment and a freezer evaporator for the freezer compartment, A first refrigerant flow through which the refrigerant in the compressor flows to the refrigeration evaporator and the freezing evaporator, A refrigerator provided with a three-way valve for converting a refrigerant in a compressor into a second refrigerant flow flowing only in a freezing evaporator, And a defrosting operation of the refrigerating evaporator when the refrigerating evaporator is lower than the predetermined temperature after a predetermined time has elapsed since the three-way valve is switched to start the second refrigerant flow. The method of claim 1, Install a refrigeration blower on the refrigeration evaporator, And a three-way valve is switched to drive the refrigeration blower from the time when the second refrigerant flow starts. The method of claim 1, A control method for a refrigerator, wherein the second refrigerator compartment is a vegetable compartment. The main body of the refrigerator is partitioned up and down by a heat insulating partition, divided into a refrigeration space and a freezing space, In the refrigerating space, the first refrigerating compartment and the second refrigerating compartment are installed in order from above, and the freezing compartment is installed in the freezing compartment. A refrigerator evaporator for the first refrigerator compartment and a second refrigerator compartment and a freezer evaporator for the freezer compartment, A first refrigerant flow through which the refrigerant in the compressor flows to the refrigeration evaporator and the freezing evaporator, A refrigerator provided with a three-way valve for converting a refrigerant in a compressor into a second refrigerant flow flowing only in a freezing evaporator, A refrigerator comprising: a defrosting operation of the refrigerating evaporator when the refrigerating evaporator is lower than the predetermined temperature after a predetermined time has elapsed since switching the three-way valve to start the second refrigerant flow. The method of claim 4, wherein Install a refrigeration blower on the refrigeration evaporator, A refrigerator, characterized in that for driving the refrigeration blower when the three-way valve is switched to start the second refrigerant flow.