KR19980026179A - Refrigerant Control Unit for Multi Combination Air Conditioner - Google Patents

Abstract

The present invention relates to a refrigerant control device for a multi-combination air conditioner, comprising a compressor (22), a condenser (24), a refrigerant distributor (26), a large-capacity indoor unit (30), and first and second small capacity indoor units (40, 50). The evaporators (A, B, C) of) are sequentially installed to form a closed cycle, while the bypass portion 28 is provided between the outlet of the condenser 24 and the inlet of the compressor 22, It is possible to improve cooling capacity by appropriately supplying cool air to the evaporator of each indoor unit without using a receiver, and to perform cooling appropriate to the room size.

Description

Refrigerant Control Unit for Multi Combination Air Conditioner

The present invention relates to a refrigerant control apparatus of a multi-combination air conditioner in which an air conditioner and a wall-mounted air conditioner are combined. More specifically, the refrigerant discharged from the evaporators of a plurality of indoor units having different capacities is compressed and condensed in one outdoor unit, and then the solenoid A valve, a capillary tube, and a bypass tube are related to the refrigerant control apparatus of the multi combination type air conditioner which distributes to the evaporator of each said indoor unit.

In general, the compressor of the air conditioner is mainly used rotary compressor or scroll compressor, the rotary compressor is mainly used for small capacity air conditioner having a small capacity, the receiver is installed.

On the other hand, a scroll compressor is mainly used in a multi-combination air conditioner having a large capacity. When the scroll compressor is not provided with a receiver, a receiver must be separately installed.

Since the present invention relates to a multi combination air conditioner, the term 'compressor' described in the following specification means a scroll compressor.

In the conventional multi-combination air conditioner, as shown in FIG. 1, one 7-plane indoor unit 3 and two 9-plane indoor units 5 and 7 are connected to one outdoor unit 1, respectively.

As shown in FIG. 2, the conventional multi-combination air conditioner includes a compressor 11 in which the outdoor unit 1 compresses a low-temperature, low-pressure gas refrigerant to discharge a high-temperature, high-pressure gas refrigerant, and the compressor. The condenser 13 cools the gas refrigerant of high temperature and high pressure discharged from the liquid 11 to liquefy and discharges the liquid refrigerant of normal temperature and high pressure, and selectively discharges the liquid refrigerant of normal temperature and high pressure discharged from the condenser 13. Low temperature, low pressure by expanding the liquid refrigerant of room temperature, high pressure introduced through the first to fourth solenoid valves (SV10, SV11, SV12, SV13), the first to fourth solenoid valves (SV10, SV11, SV12, SV13) First to fourth capillaries C10, C11, C12, and C13, which are converted into liquid refrigerant of the first to third chambers 3, 5, and 7, and flow out to the evaporators D, E, and F; Separating the liquid refrigerant mixed in the low-temperature, low-pressure gas refrigerant evaporated in the evaporator (D, E, F) of the first to third rooms (3, 5, 7) Is configured to include a receiver 15 for supplying the compressor (11).

In the conventional multi-combination air conditioner configured as described above, the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is converted into a liquid refrigerant of normal temperature and high pressure in the condenser 13, and thus the first to fourth solenoid valves SV10, SV11, SV12, SV13).

The first to fourth solenoid valves SV10, SV11, SV12, and SV13 are opened and closed by a control device (not shown), and the liquid refrigerant having normal temperature and high pressure discharged from the condenser 13 is first to fourth to fourth solenoid valves. The low-temperature, low-pressure liquid refrigerant expanded through the fourth solenoid valves SV10, SV11, SV12, and SV13 and the first to fourth capillaries C10, C11, C12, and C13 includes the first to third chambers (3, 5). According to the operating state of, 7, it is suitably supplied to the evaporators D, E, F of the first to third rooms 3, 5, 7.

At this time, when only a small capacity indoor unit is operated, the liquid refrigerant of room temperature and high pressure discharged from the condenser 13 is bypass solenoid valve SV-BY and bypass capillary tube C- to prevent liquid refrigerant inflow and to control the amount of refrigerant. BY) flows into the receiver 15.

The low temperature and low pressure are supplied to the evaporators (D, E, F) of the first to third chambers (3, 5, 7) through the first to fourth capillaries (C10, C11, C12, C13). The liquid refrigerant is evaporated in the evaporators (D, E, F) of the first to third chambers (3, 5, 7) and converted into a low-temperature, low-pressure gas refrigerant, wherein the first to third chambers ( The outside air temperature of the evaporator (D, E, F) of the 3, 5, 7 is lowered, and the cold air is rotated to supply the indoor air.

Since the low-temperature, low-pressure gas refrigerant evaporated in the evaporators (D, E, F) of the first to third chambers (3, 5, 7) as described above, some liquid refrigerant is mixed, so that the compressor (11) In order to prevent damage to the liquid receiver 15 is installed to separate the liquid refrigerant, the liquid refrigerant is separated through the receiver 15 the gas refrigerant is sucked into the compressor (11) is a high temperature, Compressed again with high-pressure gas refrigerant.

At this time, the first to fourth solenoid valves SV10, SV11, SV12, SV13 and the bypass solenoid valve SV-BY are opened and closed as shown in Table 1 by a control device (not shown).

That is, when each indoor unit 3, 5, 7 is operated at the same time, the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is converted into liquid refrigerant of normal temperature and high pressure in the condenser 13, The liquid at room temperature and high pressure discharged from the condenser 13 while being introduced into the evaporator D of the first chamber 3 through the first capillary tube C10, the second solenoid valve SV11, and the second capillary tube C11. The refrigerant flows into the evaporator E of the second indoor unit 5 through the first capillary tube C10, the third solenoid valve SV12, and the second capillary tube C12, and is discharged from the condenser 13. The high pressure liquid refrigerant flows into the evaporator F of the third chamber 7 through the first capillary tube C10, the fourth solenoid valve SV13, and the fourth capillary tube C13.

At this time, the bypass solenoid valve SY-BY is closed.

When two of the indoor units 3, 5, and 7 are operated at the same time, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is converted into a liquid refrigerant of normal temperature and high pressure in the condenser 13, Two solenoid valves (two of SV11, SV12, SV13) through the first capillary tube (C10) and two evaporators (A, B, C of two) through capillary tubes (two of C11, C12, C13) connected thereto. Flows into).

At this time, the bypass solenoid valve SY-BY is closed.

When only one of the indoor units 3, 5, and 7 is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is converted into liquid refrigerant of normal temperature and high pressure in the condenser 13, 1 solenoid valve (1 of SV11, SV12, SV13) through the first solenoid valve (SV10) and 1 evaporator (1 of A, B, C) through the capillary (1 of C11, C12, C13) connected thereto. Dogs).

At this time, the bypass solenoid valve SY-BY is open.

However, the conventional multi-combination air conditioner as described above has a problem in that manufacturing costs increase when installing a receiver for preventing the introduction of liquid refrigerant and controlling the amount of refrigerant when only a small capacity indoor unit is operated.

In addition, since the bypass pipe and the refrigerant distribution device are designed for a multi-combination air conditioner in which three wall-mounted indoor units are combined, the bypass pipe is positioned in a multi-combination air conditioner by combining a large-capacity air conditioner and a small wall-mounted air conditioner. There was a difficulty in setting the length of the capillary tube and configuring the optimum cycle.

Accordingly, the present invention solves the above-mentioned problems of the prior art, and can adequately supply the refrigerant to a plurality of indoor units having different capacities without using a receiver, thereby improving the cooling ability and performing cooling appropriate to the room size. It is an object of the present invention to provide a refrigerant control device of a multi combination air conditioner.

In the multi-combination air conditioner of the multi-combination air conditioner according to the present invention for achieving the above object, in the multi-combination air conditioner in which the large-capacity indoor unit and the first and second small-capacity indoor units are respectively connected to one outdoor unit,

The compressor, the condenser, the refrigerant distribution unit, and the evaporator of each indoor unit are installed in order to form a closed cycle, and a bypass unit is provided between the outlet of the condenser and the inlet of the compressor.

1 is a schematic system diagram of a conventional multi combination air conditioner.

Figure 2 is a detailed schematic diagram of a conventional multi combination air conditioner.

Figure 3 is a schematic system diagram of a multi combination air conditioner according to the present invention.

Figure 4 is a detailed schematic diagram of the multi combination air conditioner according to the present invention.

5 to 11 is a view showing the flow of the refrigerant in accordance with the operating state of the indoor unit in the multi combination air conditioner according to the present invention.

* Description of the symbols for the main parts of the drawings *

20: outdoor unit 22: compressor

24: condenser 26: refrigerant distribution unit

28: Bypass part 30: Large capacity indoor unit

40: 1st small capacity indoor unit 50: 2nd small capacity indoor unit

A: Evaporator of large capacity indoor unit B: Evaporator of first small capacity indoor unit

C: Evaporators SV1 to SV6 of the second small capacity indoor unit: First to sixth solenoid valves

SV-BY: Bypass solenoid valve C1 to C4: First to fourth capillary tubes

C-BY: Bypass Capillary Tube

3 is a schematic opening diagram of a multi-combination air conditioner according to the present invention, wherein the multi-combination air conditioner according to the present invention includes a large-capacity indoor unit 30 having a size of 20 flats in one outdoor unit 20, and a first and a first type of 7 flats. Two small capacity indoor units 40 and 50 are connected, respectively.

And, as shown in Figure 4, the refrigerant control device according to the present invention, the compressor 22, the condenser 24, the refrigerant distribution unit 26, the large-capacity indoor unit 30 and the first and second Evaporators (A, B, C) of the small-capacity indoor units (40, 50) are installed in order to achieve a closed cycle, while the bypass section (28) between the outlet of the condenser (24) and the inlet of the compressor (22). Has a structure installed.

The compressor 22 compresses the low-temperature and low-pressure gas refrigerants sucked from the evaporators A, B, and C of the large-capacity indoor unit 30 and the first and second small-capacity indoor units 40 and 50 to obtain a high temperature and high pressure. The gas refrigerant is discharged to the condenser 24.

The condenser 24 is configured to cool the high temperature and high pressure gas refrigerant discharged from the compressor 22 and convert the gas refrigerant into a liquid refrigerant of normal temperature and high pressure to discharge the refrigerant to the refrigerant distribution unit 26 and the bypass unit 28.

The refrigerant distribution unit 26 selectively expands the liquid refrigerant of normal temperature and high pressure discharged from the condenser 22 to convert the liquid refrigerant of low temperature and low pressure into liquid refrigerant of low temperature and low pressure, and converts the low temperature and low pressure liquid refrigerant into the large-capacity indoor unit 30. ) And the evaporators A, B, and C of the first and second small capacity indoor units 40, 50 are selectively introduced.

The bypass unit 28 bypasses the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 to the compressor 22 to pass the large-capacity indoor unit 30 and the first unit through the refrigerant distribution unit 26. And low and low pressure liquid refrigerant flowing into the evaporators A, B, and C of the second small capacity indoor units 40 and 50.

In addition, the refrigerant distribution unit 26 is connected to the inlets of the first to fourth valves SV1, SV2, SV3, and SV4 in common to the outlet of the condenser 24, and the first solenoid valve SV1. An inlet of the first capillary tube C1 is connected to an outlet of the inlet, and an inlet of the fifth and sixth solenoid valves SV5 and SV6 is common to the outlet of the second solenoid valve SV2 and the first capillary tube C1. Inlet of the second and third capillary tubes (C2, C3) are connected to the outlets of the fifth and sixth solenoid valves (SV5, SV6), respectively, and the second and third capillary tubes (C2, C3) Evaporators (C, B) of the second and first small capacity indoor units (50, 40) are connected to an outlet of the inlet, while an inlet of the fourth capillary tube (C4) is connected to an outlet of the third solenoid valve (SV3). An evaporator A of the large-capacity indoor unit 30 is commonly connected to the fourth solenoid valve SV4 and the fourth capillary tube C4, and a capillary tube is illustrated in the large-capacity indoor unit 30. It does not) are with the built-in structure.

In addition, the bypass portion 28 is connected to an inlet of the bypass solenoid valve SV-BY to an outlet of the condenser 24, and a bypass capillary tube to an outlet of the bypass solenoid valve SV-BY. The inlet of the C-BY is connected, and the outlet of the bypass capillary C-BY is connected to the inlet of the compressor 22.

Referring to the operation of the liquid refrigerant control device of the multi combination air conditioner in the present invention configured as described above in detail.

The high-temperature, high-pressure gas refrigerant discharged from the compressor 22 is converted into a liquid refrigerant of normal temperature and high pressure in the condenser 24 and fed to the first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, SV6. do.

The first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, and SV6 are opened and closed by a control device (not shown), and the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is provided. The large capacity of the low-temperature, low-pressure liquid refrigerant expanded through the first to sixth solenoid valves (SV1, SV2, SV3, SV4, SV5, SV6) and the first to fourth capillaries (C1, C2, C3, C4) The indoor unit 30 and the first and second small-capacity indoor units 40 and 50 of the large-capacity indoor unit 30 and the first and second small-capacity indoor units 40 and 50 according to the operating state of the evaporator (A, B, C). It is suitably fed to the evaporators A, B and C.

At this time, when only a small capacity indoor unit is operated, the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is bypass solenoid valve (SV-BY) and bypass capillary tube (C-) to prevent inflow of liquid refrigerant and control the amount of refrigerant. BY) flows into the compressor 22.

The first to fourth capillaries C1, C2, C3, and C4 are supplied to the large-capacity indoor unit 30 and the evaporators A, B, and C of the first and second small-capacity indoor units 40 and 50. Low-temperature, low-pressure liquid refrigerant is evaporated in the evaporators (A, B, C) of the large-capacity indoor unit (30) and the first and second small-capacity indoor units (40, 50) and converted into a low-temperature, low-pressure gas refrigerant, wherein the evaporation heat By lowering the outside air temperature of the large-capacity indoor unit 30 and the evaporator (A, B, C) of the first and second small-capacity indoor units (40, 50), by rotating the blower motor to supply the cold air to the room will be.

As described above, the low-temperature, low-pressure gas refrigerant evaporated in the large-capacity indoor unit 30 and the evaporators A, B, and C of the first and second small-capacity indoor units 40 and 50 are sucked into the compressor 22 to be compressed. At 22, it is compressed again into a high-temperature, high-pressure gas refrigerant.

At this time, the first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, SV6 and the bypass solenoid valve SV-BY are opened and closed as shown in Table 2 by a control device (not shown). .

That is, when both the large-capacity indoor unit 30 having the built-in capillary tube (not shown) and the first and second small-capacity indoor units 40 and 50 are operated, as shown in FIG. 5, the discharge from the compressor 22 is performed. The high temperature and high pressure gas refrigerant is cooled in the condenser 24 and converted into liquid refrigerant at room temperature and high pressure, and then the evaporator A of the large-capacity indoor unit 30 through the third solenoid valve S3 and the fourth capillary tube C4. ), And the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is connected to the first solenoid valve SV1, the first capillary tube C1, the sixth solenoid valve SV6, and the third capillary tube C3. Into the evaporator (B) of the first small-capacity indoor unit (40), the liquid refrigerant of room temperature and high pressure discharged from the condenser (24) is the first solenoid valve (SV1), the first capillary tube (C1), It flows into the evaporator C of the 2nd small capacity indoor unit 50 through the 5th solenoid valve SV5 and the 2nd capillary tube C2.

As described above, the low-temperature, low-pressure liquid refrigerant introduced into the evaporators A, B, and C of the large-capacity indoor unit 30 and the first and second small-capacity indoor units 40 and 50 is the large-capacity indoor unit 30 and the first and second 2 is evaporated in the evaporator (A, B, C) of the small-capacity indoor unit (40, 50) and converted into a low-temperature, low-pressure gas refrigerant, and then sucked into the compressor 22 to the high-temperature, high-pressure gas refrigerant It will be compressed again.

In addition, when the large-capacity indoor unit 30 and the first small-capacity indoor unit 40 with capillary tubes (not shown) are operated at the same time, as shown in FIG. 6, the high-pressure gas refrigerant discharged from the compressor 22 is shown. Is cooled in the condenser 24 and converted into a liquid refrigerant at room temperature and high pressure, and then flows into the evaporator A of the large-capacity indoor unit 30 through the fourth solenoid valve SV4 and is discharged from the condenser 24. The liquid refrigerant at room temperature and high pressure passes through the first solenoid valve SV1, the first capillary tube C1, the sixth solenoid valve SV6, and the third capillary tube C3. Flows into B).

As described above, the low-temperature, low-pressure liquid repellent introduced into the evaporators A and B of the large-capacity indoor unit 30 and the first small-capacity indoor unit 40 includes the large-capacity indoor unit 30 and the evaporator A of the first small-capacity indoor unit 40. , B) is evaporated and converted into a low-temperature, low-pressure gas refrigerant, which is then sucked into the compressor 22 and compressed again by the high-pressure, high-pressure gas refrigerant in the compressor 22.

In addition, when the large-capacity indoor unit 30 and the second small-capacity indoor unit 50 having a capillary tube (not shown) are operated at the same time, as shown in FIG. 7, the gas of high temperature and high pressure discharged from the compressor 22. The refrigerant is cooled in the condenser 24 and converted into a liquid refrigerant at room temperature and high pressure. The refrigerant is then introduced into the evaporator A of the large-capacity indoor unit 30 through the fourth solenoid valve SV4 and discharged from the condenser 24. Evaporator of the second small-capacity indoor unit 50 through the first liquid solenoid valve SV1, the first capillary tube C1, the fifth solenoid valve SV5, and the second capillary tube C2. Flows into (C).

As described above, the low-temperature, low-pressure liquid refrigerant introduced into the evaporators A and C of the large-capacity indoor unit 30 and the second small-capacity indoor unit 50 is an evaporator (A) of the large-capacity indoor unit 30 and the second small-capacity indoor unit 50. , C) is converted into a low-temperature, low-pressure gas refrigerant, and then sucked into the compressor 22 to be compressed again into a high-temperature, high-pressure gas refrigerant in the compressor (22).

In addition, when the first and second small-capacity indoor units 40 and 50 are operated at the same time, as shown in FIG. 8, the high temperature and high pressure gas refrigerant discharged from the compressor 22 is cooled in the condenser 24 to be cooled to room temperature. After being converted into a high pressure liquid refrigerant, the second solenoid valve SV2, the sixth solenoid valve SV6, and the third capillary tube C3 flow into the evaporator B of the first small capacity indoor unit 40. The liquid refrigerant of room temperature and high pressure discharged from the condenser 24 may be discharged through the second solenoid valve SV2, the fifth solenoid valve SV3, and the second capillary tube C2. Flows into the evaporator (C).

As described above, the low-temperature, low-pressure liquid refrigerant introduced into the evaporators B and C of the first and second small capacity indoor units 40 and 50 may be the evaporators B and C of the first and second small amount indoor units 40 and 50. ) Is converted into a low-temperature, low-pressure gas refrigerant, and then sucked into the compressor 22 to be compressed again into a high-temperature, high-pressure gas refrigerant in the compressor (22).

On the other hand, when the large-capacity indoor unit 30 having a capillary tube (not shown) is operated alone, as shown in FIG. 9, the high-temperature, high-pressure gas refrigerant discharged from the compressor 22 is discharged from the condenser 24. After cooling, the liquid refrigerant is converted into a liquid refrigerant having a normal temperature and a high pressure, and then fed to the evaporator A of the large-capacity indoor unit 30 through the fourth solenoid valve SV4.

As described above, the low-temperature and low-pressure liquid refrigerant introduced into the evaporator A of the large-capacity indoor unit 30 is evaporated in the evaporator A of the large-capacity indoor unit 30 and converted to the low-temperature, low-pressure gas refrigerant, and then the compressor 22 ) Is compressed by the compressor 22 into a high-temperature, high-pressure gas refrigerant.

In addition, when the first small-capacity indoor unit 40 is operated alone, as shown in FIG. 10, the high-temperature and high-pressure gas refrigerant discharged from the pressure gauge 22 is cooled in the condenser 24 to store room temperature and high pressure. After being converted into a liquid refrigerant, it is introduced into the evaporator B of the first small capacity indoor unit 40 through the second solenoid valve SV2, the sixth solenoid valve SV6, and the third capillary tube C3.

As described above, the low-temperature, low-pressure liquid refrigerant introduced into the evaporator B of the first small capacity indoor unit 40 is evaporated in the evaporator B of the first small capacity indoor unit 40 to be converted into a low-temperature, low-pressure gas refrigerant. In this case, the compressor 22 is sucked into the compressor 22 and is compressed again into a high-temperature, high-pressure gas refrigerant in the compressor 22.

At this time, a portion of the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is introduced into the compressor 22 through a bypass solenoid valve SV-BY and a bypass capillary tube C-BY. The first small-capacity indoor unit 40 is bypassed to the compressor 22 through the bypass solenoid valve SV-BY and the bypass capillary tube C-BY. It is possible to control the amount of liquid refrigerant flowing into the evaporator (B).

In addition, when the second small-capacity indoor unit 50 is operated alone, as shown in FIG. 11, the high-temperature and high-pressure gas refrigerant discharged from the compressor 22 is cooled in the condenser 24 to cool the liquid at room temperature and high pressure. After the refrigerant is converted into the refrigerant, the second solenoid valve SV2, the fifth solenoid valve SV5, and the second capillary tube C2 are introduced into the evaporator C of the second small capacity indoor unit 50.

As described above, the low temperature and low pressure liquid refrigerant introduced into the evaporator C of the second small capacity indoor unit 50 is evaporated in the evaporator C of the second small capacity indoor unit 50, and then converted into a low temperature, low pressure gas refrigerant. In this case, the compressor 22 is sucked into the compressor 22 and is compressed again into a high-temperature, high-pressure gas refrigerant in the compressor 22.

At this time, a portion of the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is introduced into the compressor 22 through a bypass solenoid valve SV-BY and a bypass capillary tube C-BY. Room temperature and high pressure liquid refrigerant discharged from the condenser 24 is bypassed to the compressor 22 through a bypass solenoid valve SV-BY and a bypass capillary tube C-BY to allow the second small-capacity indoor unit 50 to flow through. It is possible to control the amount of liquid refrigerant flowing into the evaporator (C).

As described above, according to the present invention, the cooling capacity can be improved by appropriately supplying a refrigerant to a plurality of indoor units having different capacities without using a receiver, and cooling can be performed according to the size of the room.

The present invention has been described with an example in which one indoor unit is connected to three indoor units, that is, one large indoor unit of 20 pyeong and two small indoor units of 7 pyeong, but the present invention is not limited thereto. Greater than the combined capacity

Applicable to the case.

Claims (10)

In the multi-combination air conditioner in which a large indoor unit and a first and second small indoor units are connected to one outdoor unit, The compressor, the condenser, the refrigerant distribution unit, and the evaporator of each indoor unit are installed in order to form a closed cycle, while a bypass unit is provided between the outlet of the condenser and the inlet of the compressor. Refrigerant control device of combined air conditioner. According to claim 1, wherein the refrigerant distribution unit, the inlet of the first to fourth valves are commonly connected to the outlet of the condenser, the inlet of the first capillary tube is connected to the outlet of the first solenoid valve, the second Inlets of the fifth and sixth solenoid valves are commonly connected to the solenoid valve and the outlet of the first capillary tube, and the inlets of the second and third capillaries are connected to the inference ports of the fifth and sixth solenoid valves, respectively. Evaporators of the second and first small capacity indoor units are connected to the outlets of the second and third capillaries, respectively, while an inlet of the fourth capillary is connected to the outlet of the third solenoid valve, and the fourth solenoid valve and the fourth are connected. The evaporator of the large-capacity indoor unit is commonly connected to the capillary tube, and the evaporator of the large-capacity indoor unit is commonly connected to the fourth solenoid valve and the fourth capillary tube. Refrigerant control device of a multi combination air conditioner, characterized in that the built-in capillary tube. According to claim 2, wherein the bypass portion, the inlet of the bypass solenoid valve is connected to the outlet of the condenser, the inlet of the bypass capillary is connected to the outlet of the bypass solenoid valve, the outlet of the bypass capillary Refrigerant control device of a multi combination air conditioner characterized in that the structure is connected to the inlet of the compressor. The method of claim 3, wherein the first solenoid valve, the third solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are opened when the large capacity indoor unit and the first and second small capacity indoor units are operated. Refrigerant control device of a multi-combination air conditioner. The multi-combination air conditioner according to claim 3, wherein the first solenoid valve, the fourth solenoid valve, and the sixth solenoid valve are opened when the large capacity indoor unit and the first small capacity indoor unit are operated at the same time. Refrigerant control device. The multi-combination air conditioner according to claim 3, wherein the first solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are opened when the large capacity indoor unit and the second small capacity indoor unit are operated at the same time. Refrigerant control device. 4. The air conditioner of claim 3, wherein the second solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are opened when the first and second small capacity indoor units are operated at the same time. Refrigerant control device. 4. The refrigerant control device according to claim 3, wherein the fourth solenoid valve is opened when the large-capacity indoor unit is operated alone. The refrigerant control of the multi combination air conditioner according to claim 3, wherein when the first small capacity indoor unit is operated alone, the second solenoid valve, the sixth solenoid valve, and the bypass solenoid valve are opened. Device. 4. The refrigerant control of the multi combination air conditioner according to claim 3, wherein the second solenoid valve, the fifth solenoid valve, and the bypass solenoid valve are opened when the second small capacity indoor unit is operated alone. Device.