KR100400470B1 - Fan Control Method of Air Conditioner - Google Patents

Abstract

A fan control method of a refrigerator according to the present invention includes a first step of determining a cooling operation load of each of a refrigerator compartment and a freezer compartment by determining whether a damper for controlling cold air inflow into a refrigerator compartment is open / closed; And a second step of varying driving speeds of the freezing fan of the refrigerator and the machine room fan in proportion to the cooling operation load according to the determination result of the first step. By varying the machine room fan, the workload of the compressor is reduced, and the efficiency of the refrigeration cycle can be improved.

Description

Fan Control Method of Air Conditioner

The present invention relates to a fan control method of a refrigerator, and in particular, by controlling the rotational speeds of the freezer compartment and the machine room fan in response to the load of the refrigerator which varies according to the opening / closing of the refrigerator compartment damper of the refrigerator. It relates to a fan control method of a refrigerator that can be maintained.

In general, a refrigerator includes a refrigeration cycle as shown in FIG. 1, wherein the refrigeration cycle compresses a refrigerant in a low-temperature low-pressure gas state into a high-temperature high-pressure gas state, and the compressor 1. A condenser (2) connected to a discharge port of the condenser (2) for condensing the gas refrigerant, which has been hot and high pressure by the compressor (1), into a high pressure liquid state, and a capillary tube (3) for reducing the high pressure liquid refrigerant passing through the condenser (2) And an evaporator 4 which generates a cold air by evaporating the liquid refrigerant decompressed by the capillary tube 3 while absorbing heat, and the cold air generated by the evaporator 4 near the evaporator 4. Circulation fans 5 and 6 are installed to circulate into the furnace.

The cool air generated in the cooler chamber of the refrigerator by the refrigerant cycle is supplied to the refrigerating chamber and the freezing chamber by rapid rotation of the freezer compartment fan and the machine room fans 5 and 6 under the control of a controller (not shown), and is then heat-exchanged in the inside of the refrigerator. It returns to the cooler chamber, cools down again, and repeats the circulation supplied to each chamber again.

At this time, an evaporator is installed in each of the refrigerating compartment and the freezing compartment, and the refrigerating compartment is installed in an upper part and cooled by natural convection, and the freezing compartment surrounds the evaporator and is cooled by heat conduction and convection. An intercooled refrigerator is a method of cooling a refrigerating compartment and a freezing compartment by circulating cold air through a fan by installing an evaporator in a place.

Among such refrigerators, in particular, the intercooled refrigerator includes a fan for discharging cold air, discharges cold air around the evaporator into a freezer compartment and a refrigerating compartment to cool the inside of the refrigerator, and performs temperature as a driving / stop control of the fan and the compressor.

In the inter-cooling refrigerator, two fans for discharging cold air into the freezer compartment and the refrigerating compartment are independently driven and controlled to drive the compressor to discharge the cold air around the evaporator to the freezer compartment and the refrigerating compartment to maintain the temperature of the refrigerator at an appropriate temperature. .

The conventional fan control method of the refrigerator controls on / off the compressor and various fans in the refrigerator according to a preset set temperature by sensing the temperature in the basic refrigerator, regardless of the installation place, the outside temperature, and the use condition of the refrigerator. That is, when the door of the refrigerator is opened, warm air from outside flows into the refrigerator, and the air temperature in the refrigerator rises rapidly, but returns to the original set temperature after a certain time by closing the door.

However, the conventional fan control method of the refrigerator has a problem in that power consumption is increased by not performing an optimal operation in response to a load change caused by damper on / off.

The present invention has been made to solve the above-mentioned problems of the prior art, the object of the refrigerator by controlling the rotational speed of the freezer compartment and the machine room fan corresponding to the load of the refrigerator fluctuates in accordance with the opening / closing of the refrigerator damper of the refrigerator It is to provide a fan control method of the refrigerator to maintain the refrigerating / refrigeration efficiency optimally.

1 is a block diagram showing a refrigeration cycle of a typical refrigerator,

2 is a block diagram showing the configuration of a refrigerator according to the present invention;

3 is a flowchart illustrating a fan control method of a refrigerator according to the present invention;

4 and 5 are graphs showing the control of the freezer compartment fan and the machine compartment fan of the refrigerator according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: control unit 11a: freezer temperature sensor

11b: refrigerator compartment temperature sensor 12a: freezer compartment fan

12b: machine chamber fan 13a: freezer compartment fan drive unit

13b: mechanical chamber fan drive 14: compressor

15: damper

According to a feature of the fan control method of the refrigerator according to the present invention for solving the above problems, it is determined whether the damper for controlling the cold air inflow into the refrigerating chamber is open / closed to determine the cooling operation load of each of the refrigerating compartment and the freezer compartment. A first step of doing; And a second step of varying driving speeds of the freezing fan and the machine room fan of the refrigerator in proportion to the cooling operation load amount according to the determination result of the first step.

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

Figure 2 is a block diagram showing the configuration of the refrigerator according to the present invention, the control unit 10 for controlling the cooling operation and defrosting operation of the freezer compartment and the refrigerating compartment, and installed in the refrigerating compartment and the freezer compartment, respectively, to detect the high temperature inside A refrigerator compartment temperature sensor and a freezer compartment temperature sensor 11a and 11b, a freezer compartment fan and a machine chamber fan 12a and 12b installed in the freezer compartment and the refrigerating compartment to promote heat exchange with the evaporator that generates cold air, and the control unit ( A fan driver 13 for controlling driving of the freezer compartment fan and the machine compartment fans 12a and 12b according to the control signal of 10), a compressor 14 constituting a refrigeration cycle together with the evaporator, and a refrigerating compartment from the refrigerating compartment evaporator. It consists of a damper 15 for controlling the inflow of cold air into the interior.

In general, when the compressor is running in the refrigerator can be divided into two cases, the first is that the cold air flows into both the freezer and the refrigerating chamber with the damper 15 is open, the second is the cold air by the damper 15 is closed This is the case when only entering the freezer.

At this time, since the cooling force required in the refrigerator increases in the open state of the damper 15, the rotational driving of the freezer compartment fan and the machine compartment fans 12a and 12b is increased, and the damper 15 is closed so that only cold air flows into the freezer compartment. In this case, only the rotational driving of the freezer compartment fan 12a is performed since the cooling force required in the refrigerator is reduced.

The controller 10 selectively varies the rotation speed of the freezer compartment fan and the machine compartment fan 12a and 12b according to the freezing load determined by the opening / closing of each temperature sensor and the dampers 11a, 11b and 15 of the refrigerator. The driving time of the freezing chamber fan and the mechanical chamber fan 12a and 12b is counted and controlled.

The fan control method of the present invention refrigerator configured as described above will be described with reference to the flowchart shown in FIG. 3 and the graph shown in FIG. 4.

The first step is to set the rotational speed of the freezer compartment fan and the machine compartment fan 12a and 12b corresponding to the evaporator temperature which varies according to the opening / closing of the damper 15 when the compressor 14 of the refrigerator is turned on. In the second step, the control unit 10 detects whether the damper 15 that controls the inflow of cold air into the refrigerating chamber while the compressor 14 of the refrigerator is driven is opened or closed to detect the cold air in the freezer compartment and the refrigerating compartment. Determine if all are entering or only into the freezer (see S1 and S2).

At this time, as shown in the graph shown in Figure 4 when the refrigerating chamber damper (15) is in the open state, both the freezer compartment and the refrigeration chamber flows in section I and simultaneously cooling, when the damper (15) is closed The cold air flows into the freezing chamber only and is divided into a section II cooling only the freezing chamber. However, the section II has a smaller load than the section I, so the required cooling power is also reduced, resulting in a drop in the evaporator temperature.

Rotational speeds of the freezer compartment fan and the machine compartment fan 12a and 12b corresponding to the open / closed state of the damper 15 are arbitrarily divided into a plurality of stages, and as the temperature of the evaporator is lowered, the freezer compartment fan and the machineroom fan The rotation speeds of 12a and 12b are increased.

When it is determined that the determination result of the second step (S2) is in the damper 15 opened state, in the third step, the refrigerator determines that cold air flows into both the freezer compartment and the refrigerating compartment, and thus the freezer compartment fan and the machine chamber fan 12a and 12b. ) Is driven at each of the first rotational speeds F1 and C1, and if it is determined that the damper 15 is in the closed state in the second step S2, in order to operate the refrigerator at low cooling power in the fourth step, Since the cooling force required for the first rotational speed is small, the temperature of the evaporator and the condenser is lowered and the refrigeration cycle efficiency is lowered. Therefore, the rotational speeds of the freezing chamber fans and the mechanical chambers 12a and 12b are set to the first rotational speeds F1 and C1. It drives at more 2nd rotation speeds F2 and C2. (F1 <F2, C1 <C2)

In this case, as shown in FIG. 5, the first rotation speed of the mechanical chamber fan may be driven to be smaller than the second rotation speed (C1> C2) (see S3 and S4).

In the fifth step, it is determined whether the driving of the compressor 14 is turned off, and if the compressor 14 continues to be driven, the process returns to the second step S2 according to the open / closed state of the damper 15 of the refrigerator. The driving of the variable freezing compartment fan and the mechanical compartment fan 12a and 12b is continued, and if it is determined that the driving of the compressor 15 is turned off, the refrigeration cycle is stopped in the sixth step (see S5 and S6).

As described above, the fan control method of the refrigerator of the present invention increases the efficiency of the refrigerating cycle by variably operating the freezer compartment and the machine room fan in response to the load of the refrigerator which varies according to the opening / closing of the refrigerator compartment damper of the refrigerator.

The fan control method of the present invention constituted as described above, the workload of the compressor is controlled by controlling the rotational speeds of the freezer compartment fan and the machine compartment fan according to the cooling force required by the open / closed state of the refrigerator compartment damper during the compressor drive state of the refrigerator. There is an effect that the efficiency of the refrigeration cycle can be improved by reducing, and providing a suitable cooling power in the refrigerator.

Claims (3)

Determining a cooling operation load of each of the refrigerating compartment and the freezing compartment by determining whether the damper controlling the inflow of cold air into the refrigerating compartment is in an open / closed state; And a second step of varying driving speeds of the freezing fan and the machine room fan of the refrigerator in proportion to the cooling operation load in accordance with the determination result of the first step. The method of claim 1, When the damper is opened in the second step and cooling operation is required for both the freezer compartment and the refrigerating compartment, the freezer compartment and the machine compartment fan are driven at each first rotational speed, and when the damper is closed and only the freezer compartment is required for the cooling operation, the freezer compartment A fan control method of a refrigerator, wherein the fan and the machine chamber fan are driven at a second rotation speed which is faster than the first rotation speed. (First rotation speed <second rotation speed) The method of claim 1, When the damper is opened in the second step and cooling operation is required for both the freezer compartment and the refrigerating compartment, the freezer compartment and the machine compartment fan are driven at each first rotational speed, and when the damper is closed and only the freezer compartment is required, the freezer compartment And controlling the fan at a second rotational speed lower than the first rotational speed and faster than the first rotational speed.