KR100551770B1 - Airconditioner - Google Patents

Abstract

The present invention relates to an air conditioner, which is connected to a plurality of compressors from accumulators and installed in parallel with the same, but the condensed oil pipes on the compressor side of the running compressor is connected to the refrigerant pipe suction line of the stationary compressor side inclined to the accumulator side Thus, while the oil on the compressor side in operation is dropped to the accumulator by gravity and prevents the flow to the stationary compressor side, there is an excellent effect that the oil can be made between the compressors.

In addition, by forming the oil between the compressors through the same oil pipes installed as described above, the oil in the compressor stopped operation through the oil pipes connected in series between the conventional compressor is moved into the operating compressor to oil between each compressor This non-uniformity has an excellent effect of preventing the compressor from being damaged due to the increased friction due to the lack of oil in the compressor in operation.

Air conditioner, fungus

Description

Air Conditioner

1 is a state diagram showing a cooling cycle of a conventional air conditioner.

2 is a state diagram showing a heating cycle of a conventional air conditioner.

Figure 3 is a detailed view schematically showing a homogeneous structure of a conventional air conditioner.

4 is a state diagram showing that the fuel oil is made between the compressors in a state in which all of the plurality of compressors of the fuel oil structure of the conventional air conditioner.

Figure 5 is a state diagram showing that the non-uniform oil is made between the compressor in a state in which only one compressor of the conventional oil conditioner structure of the multi-air conditioner.

Figure 6 is a detailed view schematically showing the homogeneous structure of the air conditioner according to the present invention.

Figure 7 is a state diagram showing that the fuel oil is made between the compressor in a state in which all of the plurality of compressors of the fuel oil structure of the air conditioner according to the present invention.

8 is a state diagram showing that the fuel oil is made between the compressors in the state in which only one compressor of the fuel oil structure of the air conditioner according to the present invention.

Figure 9 is an embodiment showing another oil structure of the air conditioner according to the present invention.

FIG. 10 is a state diagram showing that fuel oil is formed between compressors while the compressor which is stopped through the shift operation of the fuel oil structure of FIG. 8 is operated.

FIG. 11 is a view illustrating another type of oil structure of the air conditioner according to the present invention, in which at least one of the three compressors is operated, and oil is formed between the compressors.

FIG. 12 is a view illustrating a condition in which the fuel oil is formed between the compressors while at least one of the four compressors is operated as another fuel oil structure of the air conditioner according to the present invention. FIG.

Explanation of symbols on the main parts of the drawings

10, 10a, 10b, 10c. Compressor 11. Four-sided

12. Outdoor Heat Exchanger 13. Outdoor Fan

14. Expansion valve 15. Indoor heat exchanger

16. Indoor fan 20. Accumulator

30, 32, 130, 132, 230, 232, 234, 236. Refrigerant line suction line

40. 140, 142, 240, 242, 244, 246.

The present invention relates to an air conditioner, and more particularly, to install a fuel oil pipe connected in parallel to a plurality of compressors from an accumulator, and to the refrigerant pipe suction line on the stationary compressor side inclined to the accumulator side of the fuel oil pipe on the compressor side in operation. It relates to a multi-air conditioner in which oil on the compressor side connected to the operation falls to the accumulator by gravity and prevents flow to the stationary compressor side while the oil is made between the compressors.

In general, an air conditioner is a device that lowers indoor temperature by discharging cold air generated through a process of compressing, condensing, expanding, and evaporating a refrigerant into an interior, and is classified into an outdoor unit installed in an outdoor side and an indoor unit installed in an indoor side. The outdoor unit includes a compressor 10 and an accumulator 20, a four-way valve 11, an outdoor heat exchanger 12, and an outdoor fan 13. The indoor unit includes an expansion valve 14 and an indoor heat exchanger 15. ), And an indoor fan 16.

In addition, in the case of the air conditioner, a plurality of indoor units may be configured in a multi-shape to be used to cool or heat a plurality of indoor spaces.

Looking at the cooling process of the air conditioner configured as described above, as shown in Figure 1, the low-temperature low-pressure gas phase refrigerant introduced into the compressor 10 from the indoor heat exchanger 15 is a high temperature and high pressure through the pressure action of the compressor (10). At the same time as being pressurized to a gaseous state of the, and discharged to the outdoor heat exchanger 12 through the four-way valve 11 switched to achieve a cooling cycle, the refrigerant discharged to the outdoor heat exchanger 12 is the outdoor heat exchanger ( 12) while performing the heat exchange with the outside air sucked into the outdoor unit by driving the outdoor fan (13) while the inside of the phase changes to a liquid state of room temperature and high pressure.

The refrigerant changed as described above is discharged to the expansion valve 14 and at the same time, it is reduced in the liquid state of low temperature and low pressure to the indoor heat exchanger 15 so as to easily evaporate while flowing inside the expansion valve 14. The refrigerant discharged to the indoor heat exchanger (15) undergoes heat exchange with the ambient air of the indoor heat exchanger (15) to form a phase change to a low temperature low pressure gas phase state, and then again through the four-way valve (11). It is introduced into the compressor (10).

As described above, the ambient air heat-exchanged with the refrigerant decompressed through the expansion valve 14 in the indoor heat exchanger 15 is changed into cold cold while depriving heat of the refrigerant, and the cold air is indoors through the indoor fan 16. As it is discharged to the air conditioning process is terminated.

In addition, the heating process of the air conditioner, which forms a cycle opposite to the above-described cooling process, as shown in Figure 2, the low-temperature low-pressure gas phase refrigerant introduced into the compressor 10 from the outdoor heat exchanger 12 is a compressor (10). Pressurized to a gaseous state of high temperature and high pressure through the pressurizing action, and is discharged to the indoor heat exchanger 15 through the four-way valve 11 switched to achieve a heating cycle to exchange heat with ambient air of the indoor heat exchanger 15. After the phase change to the liquid phase of the room temperature and high pressure through the discharge valve 14, the ambient air heat-exchanged with the gaseous refrigerant of high temperature and high pressure is changed to hot air by the heat of the refrigerant, and the indoor fan ( 16) is discharged to the room to increase the temperature of the room.

In addition, the refrigerant discharged to the expansion valve 14 is reduced to a low-temperature low-pressure liquid state so that the evaporation action in the outdoor heat exchanger 12 is smoothly discharged to the outdoor heat exchanger 12, the outdoor heat exchanger The refrigerant discharged to (12) is introduced into the compressor (10) through the four-way valve (11) after the phase change to a low-temperature, low-pressure gas phase state through heat exchange with external air introduced into the outdoor unit.

However, in the air conditioner configured as described above, one or more compressors 10 are installed in the outdoor unit according to the load capacity of the indoor unit, and the variable of the indoor unit in the state where the one or more compressors 10 are installed in the outdoor unit as described above. When simultaneously operating one or more compressors 10, that is, a plurality of compressors 10, depending on the load (cooling / heating load), the oil in the compressor 10 is discharged together with the pressurized refrigerant to form a cycle, and then gaseous liquid Through the accumulator 20, which is a separator, it is re-suctioned into each compressor 10. At this time, in the case of oil, the oil is introduced into the compressor 10 having a large capacity in the process of being re-sucked with the refrigerant. As a result, a small amount flows into the compressor 10 having a smaller capacity, resulting in a shortage of oil.

In order to prevent such a non-oil condition between the compressor 10, as shown in Figure 3, by connecting the fungal oil pipe 40 in series between the compressor 10 and the compressor 10a, As shown in FIG. 4 through the oil pipe 40, the oils between the compressors 10 and 10a are horizontal to each other, but when only one compressor 10 is operated through a small cooling / heating load, FIG. As shown in FIG. 5, the oil in the compressor 10a in which the operation is stopped is moved into the compressor 10 in operation by the suction pressure difference between the compressor 10 in operation and the compressor 10a in operation. There was a big problem that the oils between (10) and (10a) become non-uniform with each other.

In addition, when the compressor 10 which is being operated through the shift operation is stopped and the compressor 10a that is stopped is driven, the oil in the driven compressor 10a is insufficient and the compressor 10a itself is increased due to the increased friction. There was also a big problem of being broken.

 In order to solve the problems described above, the present invention is connected to the plurality of compressors from the accumulator in parallel to the installation of the fluid oil pipe, while the intake of the refrigerant pipe in the stationary compressor side inclined to the accumulator side of the operating fluid oil pipe on the accumulator side By connecting to the line, the oil on the compressor side in operation is dropped to the accumulator by gravity to prevent flow to the stationary compressor, while the purpose is to make the homogeneous oil between the compressor.

In addition, by forming the oil between the compressors through the same oil pipes installed as described above, the oil in the compressor stopped operation through the oil pipes connected in series between the conventional compressor is moved into the operating compressor to oil between each compressor This non-uniformity is another object to prevent the compressor from breaking due to increased friction due to lack of oil in the compressor in operation.

An object of the present invention is to provide a plurality of compressors from parallel accumulators in parallel, and to connect the same fuel oil pipes on the compressor side in operation to the refrigerant line suction line on the stationary compressor side which is inclined toward the accumulator side. The bar can be solved by the air conditioner, will be described in detail with reference to the accompanying drawings.

6 is a detailed view schematically showing a homogeneous structure of the air conditioner according to the present invention.

An air conditioner of the present invention comprises: an outdoor unit (not shown) having a plurality of compressors (10) (10a) and an outdoor heat exchanger (not shown); An indoor unit (not shown) connected to the outdoor unit and installed in each room of the room; It is connected to the plurality of compressors 10 and 10a in parallel from the accumulator 20 in the outdoor unit, and the oil on the compressor 10 side in operation drops to the accumulator 20 by gravity and is operated at the same time. It is re-introduced to the) side so as to make the oil between the compressor (10, 10a), the milk oil pipe (140, 142); is configured to include.

Hereinafter, the air conditioner in which the fungal oil pipe is installed will be described in detail.

In the air conditioner of the present invention, the oil in the compressor (10a) is stopped when the operation of the one compressor (10a) is stopped in the state in which the bacteria oil pipe 40 is connected in series between a plurality of compressor (10, 10a) in the prior art In order to move into the compressor 10 in operation and to prevent oil between the compressors 10 and 10a from becoming non-uniform with each other, the oil on the compressor 10 side in operation is dropped into the accumulator 20 by gravity. At the same time as the flow is prevented to the stationary compressor 10a, oil dropped into the accumulator 20 is re-introduced together with the refrigerant to the compressor 10 which is in operation again, so that oil may be formed between the compressors 10 and 10a. While connecting the fungal oil pipes 140 and 142 in parallel from the accumulator 20 to the plurality of compressors 10 and 10a, the fungal oil pipe 140 on the compressor 10 side being operated is shifted to the accumulator 20 side. Refrigerant line suction on the stationary compressor 10a side As configured to connect to the 132, the present invention will be described in detail for it. The same reference numerals will be applied to the same configurations as those of the present invention and the conventional art described above.

As shown in FIG. 6, the air conditioner of the present invention includes: an outdoor unit (not shown) including a plurality of compressors 10 and 10a and an outdoor heat exchanger (not shown); An indoor unit (not shown) connected to the outdoor unit and installed in each room of the room; It is connected to the plurality of compressors 10 and 10a in parallel from the accumulator 20 in the outdoor unit, and the oil on the compressor 10 side in operation drops to the accumulator 20 by gravity and is operated at the same time. It is re-introduced to the) side so as to make the oil between the compressor (10, 10a), the milk oil pipe (140, 142); is configured to include.

The fungal oil pipe 140 on the compressor 10 side in operation is connected to the refrigerant pipe suction line 132 on the compressor 10a side that is stopped.

The fuel oil pipe 142 on the compressor 10a side being stopped is connected to the refrigerant pipe suction line 30 on the compressor 10a side in operation.

Refrigerant in which the oil filling pipe 140 on the compressor 10 side in operation is installed so that the oil on the compressor 10 side drops to the accumulator 20 by gravity and prevents the flow to the stationary compressor 10a. The tube suction line 132, that is, the refrigerant tube suction line 132 on the stationary compressor 10a side, is inclined at a predetermined angle toward the accumulator 20 side.

As described above, when the all of the plurality of compressors are driven for the operation of the air conditioner having the same oil pipe and the only one of the plurality of compressors is driven, the state of the oil between the compressors is as follows.

7 is a state diagram showing that the fuel oil is made between the compressors in a state in which all the plurality of compressors of the air conditioner structure of the air conditioner according to the present invention, Figure 8 is a state in which only one compressor of the fuel oil structure of the air conditioner according to the present invention is operated Is a state diagram showing that homogeneous oil is formed between compressors.

In order to explain in more detail the homogenization process through the compressor driving, a plurality of compressors are referred to as a first compressor and a second compressor.

First, a description will be given of the process of homogenizing between compressors when both the first and second compressors are driven for the operation of the air conditioner in which the oil is installed.

6, the refrigerant pipe suction line 132 on the side of the second compressor 10a inclined toward the accumulator 20 has a fungal oil pipe (hereinafter referred to as a first fungal oil pipe) 140 on the first compressor 10 side inclined toward the accumulator 20 side. Is connected to the coolant pipe (hereinafter referred to as a second coolant pipe) on the second compressor (10a) side 142 is connected to the refrigerant pipe suction line (30) on the first compressor (10) side. When driving both the first and second compressors 10 and 10a, first, the oil on the side of the first compressor 10 is, as shown in FIG. 7, the first fungal oil pipe installed in the first compressor 10 ( Through the 140, the first fuel oil pipe 140 is connected to the refrigerant pipe suction line 132 on the side of the second compressor 10a connected to the second compressor 10a, that is, the refrigerant pipe suction line 132 inclined toward the accumulator 20. As described above, the oil on the first compressor 10 side flowing into the refrigerant pipe suction line 132 on the second compressor 10a side is mixed with the refrigerant sucked by the driving of the second compressor 10a and the cold It is presented in the flow into the second compressor (10a) with the passage.

In addition, the oil on the second compressor (10a) side is sucked into the refrigerant pipe on the first compressor (10) side to which the second fuel oil pipe (142) is connected through the second fuel oil pipe (142) installed in the second compressor (10a). The oil on the side of the second compressor (10a), which flows to the line (30) and flows to the refrigerant pipe suction line (30) of the first compressor (10) as described above, is sucked by the driving of the first compressor (10). Mixing with the refrigerant flows into the first compressor 10 in accordance with the flow of the refrigerant, the homogeneous oil is made between the first and second compressors 10 and 10a being driven.

Next, only the first compressor 10 of the plurality of first and second compressors 10 and 10a is driven for the operation of the air conditioner in which the fungal oil pipes 140 and 142 are installed, and the second compressor 10a is driven. The state of the homogeneous oil between the first and second compressors 10 and 10a when stopped is as follows.

As described above, the first fuel oil pipe 140 on the first compressor 10 side is connected to the refrigerant pipe suction line 132 on the second compressor 10a side inclined to the accumulator 20 side, and the second compressor. When only the first compressor 10 is driven in the state in which the second fungal oil pipe 142 on the 10a side is connected to the refrigerant pipe suction line 30 on the first compressor 10 side, the first compressor 10 As shown in FIG. 8, the oil on the side of the refrigerant is the refrigerant on the side of the second compressor 10a to which the first fuel oil pipe 140 is connected through the first fuel oil pipe 140 installed in the first compressor 10. The first tube flows into the tube suction line 132, that is, the refrigerant tube suction line 132 inclined toward the accumulator 20, and flows into the refrigerant tube suction line 132 on the second compressor 10a side as described above. The oil on the compressor 10 side is stopped and the refrigerant pipe suction line 132 on the second compressor 10a side where no flow of refrigerant exists, that is, the accumulator Falling to the accumulator 20 through the refrigerant pipe suction line 132 of the second compressor 10a side inclined to the (20) side, the first compressor 10 side oil dropped to the accumulator 20 is Mixed with the refrigerant sucked by the driving of the first compressor 10 and re-introduced into the first compressor 10 according to the flow of the refrigerant, the first compressor 10 in operation and the second compressor 10a in which the operation is stopped. Soy milk is made in the liver.

9 is an embodiment showing another fuel oil structure of the air conditioner according to the present invention, FIG. 10 is a state in which the fuel oil is made between the compressor while the compressor was stopped by the shift operation of the air conditioner oil structure of FIG. As shown in FIG. 6, the fungal oil pipe 140 on the compressor 10 side in operation is connected to the refrigerant pipe suction line 132 on the stopped compressor 10a side inclined toward the accumulator 20 side, and the stopped compressor ( In the state where the bacteria oil pipe 142 on the 10a side is connected to the refrigerant pipe suction line 30 on the compressor 10 side in operation, the compressor 10a side in operation during the alternating operation between the compressors 10 and 10a. The refrigerant pipe suction line in which the oil pump pipe 142 of the compressor 10a in operation is installed so that the oil of the oil drops to the accumulator 20 by gravity and is prevented from flowing to the compressor 10 stationary through the shift operation. 130) that is, depending on the shift A refrigerant suction pipe line 130 of the grounded compressor 10 side is composed predetermined angle inclined toward the accumulator 20 (see Fig. 9).

In addition, in the respective refrigerant pipe suction lines 130 and 132, the inclined directions are formed to be the same.

In contrast to FIG. 8, the first compressor 10 in operation among the plurality of first and second compressors 10 and 10a is stopped for the operation of the air conditioner having the same oil structure, and the stopped second compressor 10a is stopped. The following describes the level of oil between the first and second compressors 10 and 10a through alternate driving.

As described above, the first fuel oil pipe 140 on the first compressor 10 side is connected to the refrigerant pipe suction line 132 on the second compressor 10a side inclined to the accumulator 20 side, and the second compressor. When only the second compressor 10a is driven in a state in which the second fuel oil pipe 142 on the 10a side is connected to the refrigerant pipe suction line 130 on the side of the first compressor 10 inclined to the accumulator 20 side. As shown in FIG. 10, the oil on the side of the second compressor 10a may include a first connected to the second fuel oil pipe 142 through a second fuel oil pipe 142 installed on the second compressor 10a. The refrigerant pipe suction line 130 of the compressor 10 side, that is, the refrigerant pipe suction line 130 inclined toward the accumulator 20 side, and flows to the refrigerant pipe suction line of the first compressor 10 side ( The oil on the second compressor 10a side flowing to 130 is stopped and the refrigerant pipe suction on the side of the first compressor 10 does not exist. It falls into the accumulator 20 through the inlet line 130, that is, through the refrigerant pipe suction line 130 on the side of the first compressor 10 inclined toward the accumulator 20, and falls to the accumulator 20. The oil of the second compressor 10a side is mixed with the refrigerant sucked by the driving of the second compressor 10a and re-introduced into the second compressor 10a according to the flow of the refrigerant to operate with the second compressor 10a in operation. The homogeneous oil is made between the stationary first compressors 10.

FIG. 11 is a view showing a state in which the fuel oil is formed between the compressors while one or more compressors of the three compressors are operated as another fuel oil structure of the air conditioner according to the present invention. The three compressors are referred to as first, second and third compressors 10, 10a and 10b for convenience.

As described above, the fuel oil structure of another embodiment of the air conditioner is a second compressor (10a) inclined to the accumulator 20 side of the fuel oil pipe (hereinafter referred to as the first fuel oil pipe) 240 on the first compressor 10 side. A third compressor connected to the refrigerant pipe suction line 232 on the side of the refrigerant pipe, and the fuel oil pipe on the second compressor 10a side (hereinafter, referred to as a second fuel oil pipe) 242 is inclined toward the accumulator 20 side. A first compressor connected to the refrigerant pipe suction line 234 on the side of the 10b side, and the milk oil pipe (called the third oil pipe) on the third compressor 10b side is inclined toward the accumulator 20 side. It is connected to the refrigerant pipe suction line 230 on the (10) side.

The first, second and third compressors 10, 10a and 10b operate in the above-described manner, that is, the first, second and third compressors 10, 10a and 10b all operate, or only one compressor operates respectively. Or, if the process of making the fuel oil between the compressor 10, 10a, 10b in accordance with the manner of operating only two compressors as follows.

First, when driving all of the first, second and third compressors 10, 10a and 10b, as shown in FIG. 11A, the oil on the side of the first compressor 10 is connected to the first bacterial oil pipe 240. And flows into the refrigerant pipe suction line 232 on the second compressor 10a side, and is mixed with the refrigerant sucked into the refrigerant pipe suction line 232 on the second compressor 10a side. The oil on the second compressor (10a) side is flowed into the refrigerant pipe suction line (234) on the side of the third compressor (10b) through the second bacterial oil pipe (242), and the third compressor (10b) The refrigerant sucked into the refrigerant pipe suction line 234 on the side is mixed and flows into the third compressor 10b, and the oil on the third compressor 10b side passes through the third bacterial oil pipe 244 to the first compressor ( At the same time, the refrigerant flows into the refrigerant pipe suction line 230 at the side 10 and is mixed with the refrigerant sucked into the refrigerant pipe suction line 230 at the side of the first compressor 10 to flow into the first compressor 10. Is becomes bacteria oil occurs between the first, second, and third compressors (10) (10a) (10b).

Next, when only one of the first, second, and third compressors 10, 10a, 10b is driven, only the first compressor 10 is driven, and the second, third compressor 10a is illustratively driven. When 10b is stopped, as shown in FIG. 11B, the oil on the side of the first compressor 10 passes through the first fuel oil pipe 240 to the refrigerant tube suction line 232 on the side of the second compressor 10a. Flows to the accumulator 20 through the refrigerant pipe suction line 232 on the second compressor 10a side in which the operation is stopped and there is no refrigerant flow, and the refrigerant on the first compressor 10 side being driven As the oil flows back into the first compressor 10 through the pipe suction line 230, the lubricating oil is formed between the first compressor 10 and the second and third compressors 10a and 10b, and the second compressor 10a. Alternatively, when only the third compressor 10b is driven, the same oil as the above-described process is used, and the oil level is reduced between one compressor and two stopped compressors. Will be done.

Next, when only two compressors of the first, second and third compressors 10, 10a and 10b are driven, for example, only the first and second compressors 10 and 10a are driven and the third compressor is driven. When 10b is stopped, as shown in FIG. 11C, the oil on the side of the first compressor 10 passes through the first fuel oil pipe 240 to the refrigerant line suction line 232 on the side of the second compressor 10a. At the same time, the refrigerant is mixed with the refrigerant sucked into the refrigerant pipe suction line 232 of the second compressor 10a and flows into the second compressor 10a, and the oil of the second compressor 10a is discharged. 2 flows into the refrigerant pipe suction line 234 on the third compressor 10b side through the fungal oil pipe 242, and the operation is stopped to allow the refrigerant pipe suction line 234 on the third compressor 10b side to stop the flow of refrigerant. The first compressor 10 and the through the refrigerant pipe suction lines 230 and 232 on the side of the first compressor 10 and the second compressor 10a which are being driven, while falling to the accumulator 20 through My As the oil is re-introduced into the second compressor 10a, the lubricating oil is formed between the first and second compressors 10 and 10a and the third compressor 10b, and the second and third compressors 10a and 10b or the first and third compressors are formed. When only the compressors 10 and 10b are driven, the oil is re-introduced into the second and third compressors 10a and 10b or the first and third compressors 10 and 10b in the same process as described above. The sour oil is made between two compressors and one stationary compressor.

FIG. 12 is a view showing a state in which the fuel oil is formed between the compressors while one or more of the four compressors are operated as another fuel oil structure of the air conditioner according to the present invention. The four compressors are referred to as first, second, third and fourth compressors 10, 10a, 10b and 10c for convenience.

As described above, the fuel oil structure of another embodiment of the air conditioner is composed of almost the same structure as the fuel oil structure in the state where the three compressors 10, 10a and 10b shown in Figs. 11A to 11C are installed. A fungal oil pipe (hereinafter referred to as a fourth fungal oil pipe) 246 on the fourth compressor 10c side is connected to the refrigerant pipe suction line 230 on the first compressor 10 side inclined to the accumulator 20 side. The first fungal oil pipe 240 is a refrigerant pipe suction line 232 on the side of the second compressor 10a, the second fungal oil pipe 242 is a refrigerant pipe suction line 234 on the side of the third compressor 10b, The third fungal oil pipe 244 is a refrigerant pipe suction line 236 on the fourth compressor 10c side, and the fourth fungal oil pipe 246 is a refrigerant pipe suction line 230 on the first compressor 10 side as described above. Are each connected to).

All of the first, second, third and fourth compressors 10, 10a, 10b and 10c of the first, second, third and fourth compressors 10, 10a, 10b and 10c are operated. Alternatively, each of only one compressor, or only three compressors, depending on the manner in which the operation between the compressor 10, 10a, 10b, 10c is also made of the three compressors (10, 10a) described above. (10b) The same process as the fuel oil between the compressors 10, 10a and 10b through the operation method (see FIGS. 11A to 11C), so that the process between the compressors is made for the compressor operation method. Will be omitted. Here, the compressors 10, 10a and 10b are operated in a state in which only two compressors are operated among the operating methods of the first, second, third and fourth compressors 10, 10a, 10b and 10c. Only the process in which the oil (10c) is made will be described.

When only two compressors of the first, second, third, and fourth compressors 10, 10a, 10b, and 10c are driven, for example, only the first, second, compressors 10, 10a are driven, When the 3rd and 4th compressors 10b and 10c are stopped, as shown in FIG. 12A, the oil on the side of the first compressor 10 passes on the side of the second compressor 10a through the first funnel oil pipe 240. As shown in FIG. While flowing into the refrigerant pipe suction line 232, the refrigerant is sucked into the refrigerant pipe suction line 232 on the side of the second compressor 10a and mixed into the second compressor 10a and flows into the second compressor 10a. ) Oil flows to the refrigerant pipe suction line 234 on the third compressor 10b side through the second fungal oil pipe 242, but the operation is stopped to prevent the refrigerant from flowing. While falling to the accumulator 20 through the refrigerant pipe suction line 234, and through the refrigerant pipe suction lines 230 and 232 of the first compressor 10 and the second compressor (10a) side being driven, 1 compressor (10) and As the oil is re-introduced into the second compressor 10a, the lubricating oil is formed between the first and second compressors 10 and 10a and the third and fourth compressors 10b and 10c, and conversely, the third and fourth compressors 10b and ( In the case of driving only 10c), the oil is re-introduced into the third and fourth compressors in the same process as the above-described process, so that the oil is made between the two compressors in operation and the two compressors in the stopped state.

By way of example, when only the first and third compressors 10 and 10b are driven, and the second and fourth compressors 10a and 10c are stopped, as shown in FIG. The oil of (10) (10b) is flowed through the first and third bacterial oil pipes (240, 244) to the refrigerant pipe suction lines (232, 236) of the second and fourth compressors (10a, 10c), Operation stops and falls to the accumulator 20 through the refrigerant pipe suction lines 232 and 236 on the second and fourth compressors 10a and 10c without the flow of refrigerant, and falls to the accumulator 20. The oil on the first and third compressors 10 and 10b side of the first and third compressors 10 and 10b is transferred through the refrigerant pipe suction lines 230 and 234 on the side of the first compressor 10 and the third compressor 10b which are being driven. As the oil is re-introduced into the 10 and the third compressor 10b, the oil is made between the first and third compressors 10 and 10b and the second and fourth compressors 10a and 10c, and conversely, the second and fourth compressors. If only (10a) and (10c) are driven, the process returns to the same process as described above. As work flows back into the second and fourth compressors 10a and 10c, the lubricating oil is formed between the two compressors in operation and the two compressors in the stopped state.

Further, as a homogeneous structure of another embodiment of the air conditioner according to the present invention, when n compressors 10 are installed, the homogenizer pipe 240 installed for the homogenization between the compressors 10 may also have three compressors of FIG. 10) The same as the structure for installing the same oil soak tube 240, 242, 244 and 246 in the state of (10a) or (10b) and the four compressors (10) (10a) (10b) and (10c) of FIG. In particular, the process in which the fuel oil is made between the compressors 10 according to the n compressors 10 operating method may also be performed through the three and four compressors 10, 10a, 10b, and 10c operating methods described above. While the same process as the process of making the oil between the compressors 10, 10a, 10b and 10c is made, the oil between the n compressors 10 is also made.

The homogeneous oil structure of the air conditioner configured as described above is equalized between the compressors by preventing the oil of the operating compressor from flowing to the stationary compressor when all the compressors are operated without any compressors. In the case of the air conditioner oil structure of the present invention, a multi-type air conditioner connecting a plurality of indoor units to one outdoor unit to cool or heat a plurality of indoor spaces as well as a general air conditioner It can also be applied in advance.

The air conditioner of the present invention is constructed by connecting the same oil pipes in parallel to the plurality of compressors from the accumulator, and connecting the same oil pipes on the compressor side in operation to the refrigerant pipe suction line on the stationary compressor side inclined toward the accumulator side. While the oil on the compressor side is dropped into the accumulator by gravity and prevents flow to the stationary compressor side, there is an excellent effect that the oil can be made between the compressors.

In addition, by forming the oil between the compressors through the same oil pipes installed as described above, the oil in the compressor stopped operation through the oil pipes connected in series between the conventional compressor is moved into the operating compressor to oil between each compressor This non-uniformity has an excellent effect of preventing the compressor from being damaged due to the increased friction due to the lack of oil in the compressor in operation.

Claims (7)

An outdoor unit having a plurality of compressors and an outdoor heat exchanger; An indoor unit connected to the outdoor unit and installed in each room of the indoor unit; It is connected in parallel to the plurality of compressors from the accumulator in the outdoor unit, the oil of the compressor side in operation is dropped to the accumulator by gravity, and the dropped oil is mixed with the refrigerant sucked by the driving of the compressor in operation to the compressor side in operation. Includes; the fungal oil pipe to be re-introduced so that the oil between the compressor is made, The fuel oil pipe on the compressor side in operation is connected to the refrigerant line suction line on the stationary compressor side connected to the accumulator. The air conditioner according to claim 1, wherein the refrigerant pipe suction line is inclined at a predetermined angle so that the oil on the compressor side in operation is dropped by the gravity to the accumulator to prevent flow to the stationary compressor side. An outdoor unit having a plurality of compressors and an outdoor heat exchanger; An indoor unit connected to the outdoor unit and installed in each room of the indoor unit; It is connected in parallel to the plurality of compressors from the accumulator in the outdoor unit, the oil of the compressor side in operation is dropped to the accumulator by gravity, and the dropped oil is mixed with the refrigerant sucked by the driving of the compressor in operation to the compressor side in operation. Includes; the fungal oil pipe to be re-introduced so that the oil between the compressor is made, The fuel oil pipe on the side of the compressor being stopped is connected to the refrigerant line suction line on the compressor side of the running compressor connected to the accumulator. 4. The refrigerant pipe suction line of claim 3, wherein the oil on the compressor side drops to the accumulator by gravity during operation of the stationary compressor, and the refrigerant pipe suction line is inclined at a predetermined angle so as to prevent flow to the stationary compressor side through alternating operation. Air conditioner characterized by. delete 5. The air conditioner according to claim 2 or 4, wherein each of the refrigerant pipe suction lines is inclined to the accumulator side. The air conditioner according to claim 2 or 4, wherein the inclination directions of the respective refrigerant pipe suction lines are the same.

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