KR20060000943A - Refrigeration system in the refrigerator and refrigeration control method implementing it - Google Patents

Abstract

The present invention relates to a cooling system of a refrigerator and a cooling control method for realizing the same. A refrigerator cooling system for maintaining an ultra low temperature, a low temperature freezing temperature and a general refrigeration temperature, and maintaining the ultra low temperature, a low temperature freezing temperature and a general refrigeration temperature It is an object to provide a cooling control method.

 To this end, the refrigerator consists of two compressors and a radiator in the machine room of the refrigerator, a high pressure side cooler and a low pressure side radiator in the refrigerating compartment, a high pressure side cooler in the freezer compartment, and a low pressure side cooler in the cryogenic freezer compartment. Therefore, a process for implementing the first refrigeration cycle for the cryogenic freezing compartment and the second refrigeration cycle for the freezing compartment and the refrigerating compartment is implemented by the above configuration.

Therefore, according to the present invention, by configuring two different refrigerating cycles, it is possible to maintain the freezing compartment at an ultra low temperature and a low temperature, and the refrigerating compartment at a normal refrigeration temperature.

Refrigerator, Refrigeration, Cryogenic, Compressor, Compressor, Radiator

Description

Refrigeration system and the refrigeration control method implementing it

1 is a block diagram schematically showing a refrigeration cycle components of a conventional refrigerator in the prior art.

Figure 2 is a block diagram showing a cooling system of the refrigerator for implementing two different refrigeration cycle according to the present invention.

3 is a block diagram showing a refrigerant circulation structure according to two different refrigeration cycles according to the present invention.

4 is a P-h diagram as seen in a refrigerator in which two refrigeration cycles according to the present invention are implemented.

5 is a flowchart illustrating a cooling control process by two refrigeration cycles according to the present invention.

***** Explanation of the main symbols in Figure 2 *****

20: refrigerator body 21: first freezer

22: refrigerator compartment 23: machine room

24: first compressor 25: first radiator

26: first capillary 27: first cooler

28: second compressor 29: second radiator

30: second capillary 31: second cooler

32: third cooler 33: first temperature sensor

34: second temperature sensor 35: second freezer

The present invention relates to a cooling system of a refrigerator and a cooling control method for implementing the same. More particularly, the compressor comprises two compressors and a radiator in a machine room to maintain a cryogenic temperature, a low temperature freezing temperature, and a general refrigeration temperature. A cooling system comprising a cooler and a low pressure side radiator, a high pressure side cooler in a freezer compartment and a low pressure side cooler in a cryogenic freezer compartment, and a method of performing cooling control using the same.

In general, a refrigerator includes a freezing compartment provided at an upper portion of a refrigerator main body for freezing and storing food, and a refrigerating chamber provided at a lower portion of the refrigerator main body for refrigerating food. And a refrigeration cycle for cooling the freezer compartment and the refrigerating compartment is performed.

1 is a view illustrating a configuration diagram of a cooling system of a general refrigerator.

In such a refrigerator, the low-temperature low-pressure gaseous refrigerant is compressed to high temperature and high pressure by the compressor 1, and the compressed high-temperature high-pressure gas phase refrigerant is cooled and condensed in the course of passing through the condenser 2 to be converted into a high-pressure liquid phase, and the high-pressure liquid As the refrigerant in the state passes through the capillary tube 4, its temperature and pressure are lowered, and then the evaporator 5 is changed into a low-temperature low-pressure gas state to take heat from the surroundings to cool the air around it.

The air cooled through the evaporator 5 is circulated in the freezing and refrigerating compartment, thereby lowering the temperature of the freezing compartment and the refrigerating compartment. Here, the dryer 3 for absorbing the moisture contained in the refrigerant is provided on the refrigerant flow passage leading from the condenser 2 to the capillary tube 4.

Meanwhile, during operation of the refrigerator, a large amount of water evaporates from the food stored in the freezer and the refrigerating chamber, and the frost layer is formed on the surface of the evaporator 5 by condensation and cooling in contact with the evaporator 5 along the cold air circulating. This phenomenon occurs that the heat exchange efficiency of the evaporator 5 is lowered by adiabatic action on the surface of the evaporator 5.

Therefore, the refrigerator is provided with a defrosting system for removing the frost layer formed on the surface of the evaporator (5), the defrosting system is a temperature sensor (not shown) for sensing the temperature around the evaporator (5), the heat generating action Heater (7) to increase the temperature around the evaporator (5) through, and a power controller (6) for controlling the operation of the heater (7) by grasping the temperature change around the evaporator (5) through the temperature sensor It consists of Here, the heater 7 usually consists of a heating member and a protective member such as a sheath surrounding the heating wire.

According to the defrosting system of the conventional refrigerator configured as described above, the power controller 6 automatically supplies power to the heater 7 at regular intervals during the operation of the refrigerator, thereby generating heat by the heating wire. Heat is applied around the frost to remove the frost on the evaporator (5), and when the temperature around the evaporator (5) reaches the limit set in the temperature sensor due to the continuous heating action, the power controller (6) through the temperature sensor The so-called automatic intermittent operation that detects such a situation and stops the operation of the heater 7 is performed.

However, such a common refrigerator is composed of one compressor and one condenser (also called a radiator) to provide cold air to the refrigerating compartment and the freezing compartment, and thus the cooling cycle cannot be efficiently performed because it is used without distinguishing between the cryogenic, low temperature freezing compartment, and the refrigerating compartment. .

The present invention has been conceived to overcome the above-mentioned disadvantages of the prior art, the refrigerator cooling system for maintaining the cryogenic temperature, the low temperature freezing temperature and the general refrigeration temperature and the cryogenic temperature, the low temperature freezing temperature and the general refrigeration temperature It is an object of the present invention to provide a cooling control method.

The present invention consists of two compressors and a radiator in the machine room, a high pressure side cooler in the refrigerating compartment, a low pressure side radiator in the freezer compartment a high pressure side cooler, a low pressure side cooler in the cryogenic freezer compartment and Provided is a method of performing cooling control using this.

To this end, the cooling system includes a first cooler for circulating the refrigerant at low pressure in the first freezing chamber for performing the cryogenic freezing chamber, a second cooler for circulating the refrigerant at high pressure in the second freezing chamber for performing the low temperature freezing chamber, and a first cooler in the refrigerator compartment. A third cooler arranged adjacent to the radiator at a predetermined interval to cool the heat of the radiator, a first compressor circulating the coolant to the first cooler of the first freezing chamber, and a coolant to circulate the coolant to the second cooler of the second freezing chamber A second compressor, a first temperature sensor for sensing a temperature of the first freezing chamber, a second temperature sensor for sensing a temperature of the second freezing chamber, a first radiator receiving refrigerant from the first compressor, and a second A second radiator that receives refrigerant from the compressor and is disposed adjacent to the third cooler at a predetermined interval, a first capillary tube for converting the refrigerant circulated from the first compressor into a liquid phase, and a second comp A second capillary such that the state transition from the circulating coolant in the liquid phase consists of Shah.

In addition, the cooling control method using this configuration, the step of checking whether the detected temperature of the first freezing chamber is less than the first temperature, if the temperature is less than the first temperature, the step of turning off the first compressor, and if the temperature is greater than the first temperature Turning on the first compressor, checking whether the detected temperature of the second freezing chamber is lower than the second temperature, turning off the second compressor if the temperature is lower than the second temperature, and turning the first compressor higher than the second temperature. 2 turning on the compressor.

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

2 is a block diagram showing a cooling system of a refrigerator for implementing two different refrigeration cycles according to the present invention, the refrigerator main body 20 has a first cryogenic chamber 21 of cryogenic temperature and a refrigerating chamber for maintaining a general refrigeration temperature ( 22), a low temperature second freezing chamber 35, and a machine chamber 23, and the like, each of which is provided with components for implementing a cooling system.

Referring to these components, first, the machine room 23 has a first compressor 24, a second compressor 28, a second heat radiator 29, and a second capillary tube for performing two different refrigeration cycles. 30) and the like.

The refrigerating chamber 22 includes a first radiator 25, a first capillary tube 26, and a third cooler 32. The second refrigerator (35) is configured with a second cooler (31) and a second temperature sensor (34) for temperature sensing, and the first refrigerator (21) with a first cooler (27), a first for temperature sensing Each temperature sensor 33 is configured.

This configuration results in two different refrigeration cycles. This is described as follows.

First, referring to the first refrigeration cycle, the refrigerant compressed at a high temperature in the first compressor 24 of the machine room 23 is circulated to the first heat radiator 25 disposed adjacent to the third cooler 32 in the refrigerating chamber 22. do. The first radiator 25 cools and condenses the refrigerant compressed at high temperature, and a heat radiating fan is required for this purpose. However, in the present invention, the first radiator 25 is disposed adjacent to the third cooler 32 in order to use the cold air of the third cooler 32 instead of the heat radiating fan.

Therefore, the first radiator 25 absorbs cold air from the third cooler 32 to condense the refrigerant and circulate it in the first capillary tube 26. Of course, the first compressor 24 compresses the refrigerant at a relatively low pressure as compared to the second compressor 28 of the first refrigeration cycle described below, so that the first freezing chamber 21 maintains the ultra low temperature.

The first capillary tube 26 converts the refrigerant into a liquid phase and circulates it in the first cooler 27 installed in the first freezing chamber 21. Therefore, the first cooler 27 vaporizes the liquid refrigerant to generate cold air therefrom, thereby cooling the first freezing chamber 21. The vaporized gaseous refrigerant flows back into the first compressor 24 and follows the refrigeration cycle as described above. In addition, the first freezing chamber 21 is provided with a first temperature sensor 33 connected to the microcomputer (not shown) and controlled, and according to the sensing temperature of the first freezing chamber 21 of the first compressor 24. By controlling the on and off, the ultra low temperature is maintained in the first freezing chamber 21.

The microcomputer performs a function required by the refrigerator, and for this purpose, the microcomputer is connected to other components installed in the refrigerator to transmit a command or receive information and process the same.

Unlike the first refrigeration cycle, the second refrigeration cycle is started by the second compressor 28 installed in the machine room 23. Also, unlike the first compressor 24, the second compressor 28 performs high temperature compression at a relatively high pressure.

The high temperature compressed refrigerant is circulated through the second heat radiator 29, and the heat radiator 29 cools and condenses the refrigerant. Therefore, for this purpose, a heat radiating fan (not shown) is installed at the side to cool the radiator 29.

The refrigerant condensed in the second radiator 29 is converted into a liquid refrigerant while circulating through the second capillary tube 30 installed in the machine room 23 to be introduced into the second cooler 31 installed in the second freezing chamber 35. do. The introduced liquid refrigerant generates cold air while vaporizing the second refrigerant chamber 35. The second freezing chamber 35 maintains a low temperature state as compared with the first freezing chamber 21 maintaining ultra low temperature.

The liquid phase and the gaseous phase are mixed in the refrigerant passing through the second cooler 31 of the second freezing chamber 35. This is because the second cooler 31 does not completely vaporize because the refrigerant velocity is high. In addition, in the present invention, in order to allow the third cooler 32 installed in the interior chamber 22 to cool the refrigerating chamber 22, a length of a cooling engine (not shown) piped to the second cooler 31 is properly adjusted. It is desirable to adjust so that vaporization does not occur completely in the second cooler 31. In addition, a second temperature sensor 34 is installed at one side of the second freezing chamber 35 so that the temperature information for turning on and off the second compressor 28 is maintained so that the second freezing chamber 35 is kept at a low temperature. Will be sent to.

The refrigerant passing through the second cooler 31 of the second freezer 35 is completely vaporized in the third cooler 32 to cool the refrigerating compartment 22. That is, the liquid refrigerant remaining without vaporizing in the second cooler 31 is vaporized to maintain the cooling state of the refrigerating chamber 22. Of course, the second cooler 31 is disposed adjacent to the first radiator 25 to provide cool air to the radiator 25.

The refrigerant passing through the third cooler 32 becomes a gaseous refrigerant as mentioned above and flows back into the second compressor 28 to perform a second refrigeration cycle.

A block diagram showing a simple refrigerant circulation structure for the first and second refrigeration cycles is shown in FIG. 3.

That is, the left side represents the first refrigeration cycle and the right side represents the second refrigeration cycle. In the first refrigeration cycle, the refrigerant is circulated from the first compressor 24 to the first heat radiator 25, the first capillary tube 26, the first cooler 27, and the first compressor 24 again. Is achieved.

On the other hand, in the second refrigeration cycle on the right side, the refrigerant is circulated from the second compressor 28 to the second radiator 29, the second capillary tube 30, the third cooler 32, and the second compressor 30 again. 1 cycle is achieved. Of course, the second refrigeration cycle passes through the second cooler 31 installed in the second freezer compartment 35 before the third cooler 32. In FIG. 3, the first radiator 25 and the third cooler 32 Are omitted to emphasize the adjacency.

That is, the first radiator 25 requires cooling in order to condense the refrigerant circulated from the first compressor 24. The cooling is performed by the third coolers 32 arranged side by side at a predetermined interval. Therefore, the third cooler 32 absorbs the heat from the first radiator 25. A diagram showing this graphically is shown in FIG. 4.

4 is a P-h diagram showing a change in pressure P and enthalpy h according to the first and second refrigeration cycles. That is, the P-h diagram is composed of another cycle of the first refrigeration cycle 410 performing the low pressure side refrigerant circulation process and the second refrigeration cycle 420 performing the high pressure side refrigerant circulation process. In addition, the enthalpy is separated into Δh1, Δh2, respectively, showing that it requires less heat for compression.

In addition, the amount of heat can be absorbed by absorbing the cooling condensation heat output by the first radiator 25 in the first refrigeration cycle 410 by the third cooler 32 hatched by the third cooler 32 in the second refrigeration cycle 420. The benefits are showing. Therefore, the power consumption for compression is reduced, it is possible to maintain a low temperature freezing temperature.

3 to 4 described above, it is possible to maintain or cool the cryogenic freezer temperature, the freezer compartment and the freezer compartment temperature, and a flow chart showing such a cooling control process is shown in FIG. 5. That is, the process for the first refrigeration cycle for the cryogenic freezer compartment and the second refrigeration cycle for the freezer compartment and the refrigerating compartment is carried out. This process is described in detail as follows.

The first temperature sensor 33 for sensing the first freezing chamber 21 detects the temperature of the first freezing chamber 21 and transmits temperature information to the microcomputer. The microcomputer compares the detected temperature with the first temperature, which is a set temperature for maintaining the ultra low temperature in the first freezing chamber 21 in the temperature information (step S500).

That is, the temperature is set in the microcomputer so that the first freezing chamber 21 maintains a constant freezing temperature, which is the first temperature. For example, the case where the set temperature of the 1st freezer compartment 21 is -40 degreeC is mentioned. In this case, by checking whether the detected temperature is lower than or higher than -40 ° C., if the temperature is high, the first compressor 24 is turned on. If the temperature is low, the first compressor 24 is not turned off. .

In the sensing temperature checking step of the first freezing chamber, if the sensing temperature is higher than the first set temperature, the microcomputer turns on the first compressor 24 to perform the first refrigeration cycle (step S510).

When the first compressor 24 is turned on and the cooling is performed, the microcomputer checks whether the detected temperature transmitted by the second temperature sensor 34 which senses the temperature of the second freezer 35 is lower than the second temperature. (Step S520).

That is, as shown in the above example, the holding temperature of the second freezing chamber 35 is set, which is called the second temperature, for example, -15 ° C. Therefore, the second freezing chamber 35 maintains a higher temperature than the first freezing chamber 21.

  In the sensing temperature checking step of the second freezer, if the sensing temperature is lower than the second temperature, the microcomputer turns off the second compressor 28 (step S530). On the other hand, if the sensing temperature is higher than the second temperature, the microcomputer turns on the second compressor 28 (step S540).

In the sensing temperature checking step S500, when the sensing temperature is lower than the first set temperature, the microcomputer maintains the first compressor 24 in the off state (step S501).

In the state where the first compressor 24 is off, the microcomputer checks whether the sensing temperature of the second freezing chamber 35 is lower than the second temperature (step S521).

As a result of checking the second freezer temperature, when the detection temperature is lower than the second temperature, the second compressor 28 is kept in the off state (step S530).

On the contrary, as a result of checking the second freezer temperature, when the detected temperature is higher than the second temperature, the second compressor 28 is turned on (step S540).

As mentioned above, the present invention has been described in detail with reference to the accompanying embodiments and drawings, but the present invention is not limited to the specific embodiments, and those skilled in the art or acquiring general knowledge are provided with the contents of the present invention. It should be understood that numerous variations and modifications can be made without departing from the scope of the invention. Therefore, the protection scope of the present invention will be preferred based on the appended claims.

According to the present invention, by configuring two different refrigeration cycles, it is possible to maintain the freezer compartment at an extremely low temperature and a low temperature, and to maintain the freezer compartment at a normal refrigeration temperature.

Claims (5)

A first cooler configured to circulate the refrigerant at low pressure in the first freezer compartment performing the cryogenic freezer compartment, A second cooler configured to circulate the refrigerant at a high pressure in a second freezer that performs the low temperature freezer; A third cooler disposed adjacent to the first radiator at a predetermined interval in the refrigerating chamber and cooling the heat of the radiator; A first compressor for circulating a refrigerant in a first cooler of the first freezing chamber; A second compressor for circulating a refrigerant in a second cooler of a second freezer, A first temperature sensor for sensing a temperature of the first freezing chamber; A second temperature sensor for sensing a temperature of the second freezing chamber; A first radiator receiving refrigerant from the first compressor, A second radiator receiving refrigerant from the second compressor and disposed adjacent to the third cooler at a predetermined interval; A first capillary tube for converting the refrigerant circulated from the first compressor into a liquid phase; A second capillary tube converting the refrigerant circulated from the second compressor into a liquid phase Refrigerator cooling system comprising a. The method of claim 1, The first refrigeration cycle, And a first compressor, a first radiator, a first capillary tube, a first cooler, and a first compressor. The method of claim 1, The second refrigeration cycle, And a second compressor, a second radiator, a second capillary tube, a second cooler, and a second compressor. Confirming whether the detected temperature of the first freezing chamber is less than or equal to the first temperature; If the temperature is lower than the first temperature, turning off the first compressor; If the temperature is equal to or greater than the first temperature, turning on the first compressor; Checking whether the detected temperature of the second freezer is lower than or equal to the second temperature; If the temperature is lower than the second temperature, turning off the second compressor; If the temperature is higher than the second temperature, turning on the second compressor Cooling control method comprising a. If the temperature is less than the first temperature, after the step of turning off the first compressor, Checking whether the detected temperature of the second freezer is lower than or equal to the second temperature; If the temperature is lower than the second temperature, turning off the second compressor; If the temperature is greater than or equal to the second temperature, turning on the second compressor.

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