KR102082881B1 - Multi-air conditioner for heating and cooling operations at the same time - Google Patents

Abstract

A multi-air conditioner for simultaneous heating and cooling according to an embodiment of the present invention includes a plurality of indoor and outdoor air conditioning units including an indoor heat exchanger, a compressor, an outdoor heat exchanger, and a switching unit that is disposed on the discharge side of the compressor to switch the flow of refrigerant. The outdoor unit for both air conditioning and heating, and the outdoor unit for heating and cooling, and the indoor and outdoor units for cooling and heating, and the refrigerant to the air conditioning chamber, the heating chamber, the cooling main body simultaneous, and the heating main body according to the operating conditions. It includes a distributor for dispensing, the distributor is a liquid header, a low pressure gas header, a high pressure gas header through which a refrigerant with a higher pressure than the refrigerant in the low pressure gas header, and the high pressure refrigerant of the high pressure gas header to the low pressure gas header A bypass pipe for passing, and the high-pressure gas header disposed on the bypass pipe Standing hayeoseo includes the low pressure gas flow rate control in a header for controlling the flow rate of the refrigerant by-pass parts, it is possible to prevent the freezing of the indoor unit.

Description

Multi-air conditioner for heating and cooling operations at the same time

The present invention relates to a multi-air conditioner for simultaneous heating and cooling, and more particularly, to a multi-air conditioner for cooling and heating that can prevent freezing of indoor units by bypassing refrigerant from a high pressure gas pipe connected to an outdoor unit to a low pressure gas pipe. .

In general, a multi-type air conditioner is a plurality of indoor units connected to one outdoor unit, and each of the plurality of indoor units is used as an air conditioner or heater while the outdoor unit is used in common.

Recently, a plurality of compressors are provided or a plurality of outdoor units are connected in parallel to each other in order to effectively respond to cooling or heating loads according to the number of indoor units operating.

The multi-air conditioner according to the prior art includes a plurality of outdoor units, a plurality of indoor units, and a refrigerant pipe connecting the plurality of outdoor units and the indoor units, wherein the plurality of outdoor units are a main outdoor unit and a plurality of sub It consists of an outdoor unit.

Each of the plurality of outdoor units includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant to high-temperature and high-pressure, an outdoor heat exchanger that heats the circulated refrigerant with outdoor air, and a four-way valve that switches refrigerant flow according to cooling or heating operations. Is installed. Each of the plurality of indoor units is provided with an expansion mechanism and an indoor heat exchanger that exchanges circulating refrigerant with indoor air.

In the multi-air conditioner according to the prior art configured as described above, the refrigerant compressed in the compressor of the main outdoor unit and the sub-outdoor unit is sent to the outdoor heat exchanger by the four-way valve during cooling operation, and the refrigerant passing through the outdoor heat exchanger is ambient After condensation by heat exchange with air, it is sent to the expansion mechanism. The refrigerant expanded in the expansion mechanism flows into the indoor heat exchanger, evaporates while absorbing the heat of the indoor air, thereby cooling the room.

On the other hand, during the heating operation, the flow path is switched in the four-way valve, and the refrigerant discharged from the compressor passes through the four-way valve, the indoor heat exchanger, the outdoor linear expansion valve (LEV), and the outdoor heat exchanger in turn, and Will heat up.

However, the conventional multi-air conditioner for simultaneous heating and cooling has a problem in that refrigerant remains in the high-pressure gas pipe during the operation of the cooling chamber.

In addition, in the simultaneous operation of the heating subject or the simultaneous operation of the cooling subject, even when the outdoor temperature is low, some spaces do not require cooling. At this time, if the temperature of the refrigerant supplied to the indoor unit is too low for cooling, there is a problem that the indoor unit freezes.

The problem to be solved by the present invention is to provide a multi-air conditioner with simultaneous heating and cooling, which enables effective heating and cooling simultaneously even when the temperature of the outside air is low.

In order to achieve the above object, a multi-air conditioner for simultaneous heating and cooling according to an embodiment of the present invention is disposed on a plurality of indoor and outdoor air conditioning units including an indoor heat exchanger, a compressor, an outdoor heat exchanger, and a discharge side of the compressor, and An outdoor unit for both air conditioning and heating including a switching unit for switching a flow, and disposed between the outdoor unit for air conditioning and heating and the indoor unit for air conditioning and heating, to cool the refrigerant in the air conditioning chamber, the heating chamber, the cooling body simultaneously, and the heating body at the same time. Accordingly, the distributor includes a distributor for distributing the indoor units for both heating and cooling, and the distributor includes a liquid header, a low pressure gas header, a high pressure gas header through which a refrigerant having a higher pressure than the refrigerant in the low pressure gas header flows, and a high pressure refrigerant in the high pressure gas header. Bypass piping to bypass the low-pressure gas header, and on the bypass piping It is arranged to include a flow control unit for controlling the flow rate of the refrigerant bypassed from the high pressure gas header to the low pressure gas header.

According to the multi-air conditioner for simultaneous heating and cooling of the present invention, there are one or more of the following effects.

The embodiment has an effect of opening the electromagnetic expansion valve installed in the bypass pipe during the operation of the cooling chamber and bypassing the refrigerant remaining in the high-pressure gas header with the low-pressure gas header to prevent the system from running out of refrigerant.

In addition, while cooling the space (for example, the computer room) that requires cooling at an outdoor temperature (especially in winter) that requires indoor heating, it is possible to prevent freezing of indoor units in the cooling operation.

In addition, since there is no need to turn off the air-conditioning and simultaneous multi-air conditioner in order to prevent freezing of the indoor unit during the cooling operation, there is an advantage that continuous operation of the multi-air conditioner with simultaneous heating and cooling is possible.

1 is a schematic configuration diagram of a multi-air conditioner for simultaneous heating and cooling according to an exemplary embodiment of the present invention.
FIG. 2 is an operation diagram showing an operation state of the multi-air conditioner of simultaneous heating and cooling of FIG. 1 when operating the air-conditioning compartment.
3 is an operation diagram showing an operating state of the simultaneous multi-air conditioner of air conditioning in FIG.
FIG. 4 is an operation diagram showing an operation state of the multi-air conditioner of air-conditioning and cooling of FIG. 1 during simultaneous operation of a cooling subject.
5 is an operation diagram showing the operating state of the simultaneous heating and cooling type multi-air conditioner of FIG. 1 when the heating main body is operated simultaneously.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

The spatially relative terms “below”, “beneath”, “lower”, “above”, “upper”, etc., are as shown in the figure. It can be used to easily describe the correlation between components and other components. The spatially relative terms should be understood as terms including different directions of components in use or operation in addition to the directions shown in the drawings. For example, when a component shown in the drawing is turned over, a component described as "below" or "beneath" of another component will be placed "above" the other component. You can. Thus, the exemplary term “below” can include both the directions below and above. Components can also be oriented in different directions, and thus spatially relative terms can be interpreted according to orientation.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprises" and / or "comprising" refers to the components, steps and / or actions mentioned, excluding the presence or addition of one or more other components, steps and / or actions. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains. In addition, terms defined in the commonly used dictionary are not ideally or excessively interpreted unless specifically defined.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity. In addition, the size and area of each component does not entirely reflect the actual size or area.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described.

Referring to FIG. 1, a multi-air conditioner 100 for simultaneous heating and cooling according to an embodiment of the present invention is illustrated. Simultaneous heating and cooling multi-air conditioner 100 includes first, second, third, and fourth air-conditioning indoor units (B1, B2, B3, and B4), combined air-conditioning outdoor unit (A), and distributor (C).

The outdoor unit A for both air conditioning and heating includes first and second compressors 53, 54, an outdoor heat exchanger 51, an outdoor heat exchanger fan 61, and a switching unit. Here, the switching unit includes a four-way valve (62). The suction parts of the first and second compressors 53 and 54 are connected by a common accumulator 52. The first compressor 53 is an inverter compressor capable of changing the compression capacity of the refrigerant, and the second compressor 54 is a constant speed compressor having a constant compression capacity of the refrigerant.

The first and second discharge pipes 55 and 56 are connected to the discharge portions of the first and second compressors 53 and 54, and the first and second discharge pipes 55 and 56 are connected to the lamination portion 57. The first and second discharge pipes 55 and 56 have first and second oil separators 58 and 59 to recover oil from refrigerant discharged from the first and second compressors 53 and 54. Each is installed. In the first and second oil separators 58 and 59, the oil separated from the first and second oil separators 58 and 59 is guided to the suction part of the first and second compressors 53 and 54. , 2 oil recovery pipes 30 and 31 are connected.

The lamination part 57 is connected to a high-pressure gas pipe 63 through which the refrigerant discharged from the first and second compressors 53 and 54 bypasses the four-way valve 62 without passing. In addition, the lamination part 57 is connected to the four-way valve 57 and the third discharge pipe 68.

The outdoor heat exchanger (51) is connected to the four-way valve (62) by a first connecting pipe (71). In the outdoor heat exchanger (51), refrigerant is condensed or evaporated by heat exchange with outside air. At this time, in order to make heat exchange more smoothly, the outdoor unit fan 61 flows air into the outdoor heat exchanger 51. In the multi-air conditioner 100 of simultaneous heating and cooling, the outdoor heat exchanger 51 is used as a condenser during the operation of the cooling all-room operation or the simultaneous operation of the cooling main body, and the outdoor heat exchanger 51 is the evaporator during the operation of the heating all-room operation or the heating main body. It is used as

An outdoor electromagnetic expansion valve 65 and a supercooling device 66 are provided on the liquid pipe 72 connecting the outdoor heat exchanger 51 and the distributor C. The outdoor electromagnetic window valve (65) expands the refrigerant during the operation of the entire heating room or the simultaneous operation of the heating main body. The super refrigeration unit 66 cools the refrigerant moving to the distributor C during the operation of the cooling front chamber or the simultaneous operation of the cooling main body. The outdoor electromagnetic expansion valve (74) converts refrigerant condensed in the first, second, third, and fourth indoor heat exchangers (11, 21, 32, 41) into the outdoor heat exchanger (51) when operating the entire heating room or simultaneously operating the heating main body. Inflate before entering. The supercooling device 66 surrounds a part of the liquid piping 72 and is disposed between the supercooler 66a and the supercooler 66a and the distributor C to move some of the refrigerant moving to the distributor C. A bypass pipe (66b) for bypassing the inside of the supercooler (66a), an electromagnetic expansion valve (66c) installed in the bypass pipe (66b), and a supercooler (66a) and a third discharge pipe (64) are connected. It includes a recovery pipe (66d).

The distribution unit (C) is disposed between the outdoor unit (A) for both air conditioning and heating and the indoor units (B1) (B2) (B3) (B4) for both heating and cooling, and cools the refrigerant in the cooling chamber, heating chamber, and cooling chamber. It is distributed to the indoor units (B1) (B2) (B3) (B4) combined with the first, second, third and fourth cooling and heating units according to the operating conditions of the main body and the simultaneous heating main body. The distributor C includes a high pressure gas header 81, a low pressure gas header 82, a liquid header 83, and control valves (not shown).

The indoor units B1, B2, B3, and B4 combined for the first, second, third, and fourth heating and heating are respectively the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 , 1, 2, 3, 4 indoor expansion valves 12, 22, 32, 42 and 1, 2, 3, 4 indoor fans 15, 25, 35, 45 Includes. The first, second, third, and fourth indoor expansion valves 12, 22, 32, and 42 are first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 It is installed on the first, second, third, and fourth indoor connecting pipes 13, 23, 33, 43 connecting the high pressure gas header 81.

In addition, in order to sense the temperature of the refrigerant discharged from the indoor units (B1) (B2) (B3) (B4) for both the first, second, third and fourth cooling and heating units, the first, second, third and fourth temperature sensors 16 26, 36, 46 can be installed. Here, the first, second, third, and four temperature sensors 16, 26, 36, 46 are the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 and It is installed on the 5,6,7,8 indoor connection pipes 14, 24, 34, 44 connecting the low pressure gas header 82. In addition, a temperature sensor (not shown) may be installed in the first, second, third, and fourth indoor heat exchangers 11, 21, 31, and 41.

The high pressure gas header 81 is connected to one side of the high pressure gas piping 63 and the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 of the lamination section 57, respectively. do. In addition, the low pressure gas header 82 is connected to the suction pipe 64 by a low pressure gas pipe 75, and the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 It is connected to the other side. The liquid header 83 is connected to one side of the supercooling device 66 and the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41, respectively. The high pressure gas header 81, the low pressure gas header 82, and the liquid header 83 include high pressure gas piping 63 ', low pressure gas piping 75', and liquid piping 72 'of other outdoor units (not shown). Each may be further connected.

A bypass pipe 84 is installed between the high pressure gas header 81 and the low pressure gas header 82. The bypass pipe 84 serves to bypass the high pressure refrigerant of the high pressure gas header 81 to the low pressure gas header 82.

On the bypass pipe 84, a flow rate control unit for controlling the flow rate of the refrigerant bypassed from the high pressure gas header 81 to the low pressure gas header 82 is installed. The flow control unit controls the flow rate of the refrigerant bypassed from the high-pressure gas header 81 to the low-pressure gas header 82 to prevent freezing of the indoor unit in the cooling operation at the same time as the heating main body or simultaneously the cooling main body. Alternatively, the flow control unit is opened during the operation of the cooling chamber and bypasses the residual refrigerant remaining in the high pressure gas header 81 to the low pressure gas header 82. The flow control unit may be an electronic expansion valve (85).

Hereinafter, with reference to FIGS. 2 to 5, the operation of the multi-air conditioner for simultaneous heating and cooling shown in FIG. 1 and the flow of the refrigerant accordingly will be described.

Figure 2 shows the operation of the air conditioner and the multi-air conditioner 100 at the same time during the operation of the cooling chamber, and the flow of the refrigerant accordingly. The refrigerant of the high pressure gas discharged from the first and second compressors 53 and 54 flows through the first and second discharge pipes 55 and 56 and then through the third discharge pipe 68 and the four-way valve 62 , Flows into the outdoor heat exchanger (51). The high pressure liquid refrigerant condensed in the outdoor heat exchanger (51) flows into the liquid header (83) through the supercooling device (66). The refrigerant discharged from the liquid header 83 through the connection pipes 13, 23, 33, 43 in the first, second, third, and fourth rooms is provided with electronic expansion valves in the first, second, third, and fourth rooms ( 12) After expansion in 22, 32, 42, the first, second, third, and fourth indoor heat exchangers 11, 21, 31, 41 evaporate, and the low pressure gas header 82 Flows into The low pressure gas refrigerant discharged from the low pressure gas header 82 flows into the suction and discharge pipe 64 and is then sucked through the accumulator 52 to the first and second compressors 53 and 54.

Here, since the refrigerant does not flow into the high pressure gas header 81 during the operation of the cooling chamber, the refrigerant remains in the high pressure gas header 81. At this time, the electromagnetic expansion valve 85 installed in the bypass pipe 84 is opened to bypass the refrigerant remaining in the high pressure gas header 81 to the low pressure gas header 82. Therefore, the refrigerant remains in the high-pressure gas header 81 during the operation of the cooling chamber, thereby preventing the refrigerant from running out of the system.

3 shows the operation of the simultaneous heating and cooling multi-air conditioner 100 during the operation of the heating chamber and the flow of the refrigerant accordingly. The refrigerant of the high-pressure gas discharged from the first and second compressors 53 and 54 flows through the first and second discharge pipes 55 and 56 and does not flow into the four-way valve 62, but the lamination part 57 and It passes through the high pressure gas pipe 63 and flows into the high pressure gas header 81. Refrigerant discharged from the high pressure gas header 81 through the 5, 6, 7, and 8 indoor connection pipes 14, 24, 34, 44, the first, 2, 3, 4 indoor heat exchangers (11) (21) (31) (41) condensed. Thereafter, the refrigerant flows into the liquid header 83, is discharged through the liquid pipe 72, expands in the outdoor electromagnetic expansion valve 65, and evaporates in the outdoor heat exchanger 51. The low-temperature, low-pressure gas refrigerant is introduced into the suction pipe 64 through the four-way valve 62, and then sucked into the first and second compressors 53 and 54 via the accumulator 52.

During the operation of the heating chamber, the refrigerant flows through the low-pressure gas header (82), and the electronic expansion valve (85) is closed to prevent the refrigerant from running out of the air-conditioning multi-air conditioner (100).

Figure 4 shows the operation of the air conditioner and the simultaneous operation of the multi-air conditioner 100 of cooling and cooling and the flow of the refrigerant accordingly. For convenience of explanation, it is assumed that the first, second, and third indoor units B1, B2, and B3 operate in a cooling mode, and the fourth indoor unit B4 operates in a heating mode. The flow of the refrigerant for operating the first, second, and third indoor units B1, B2, and B3 is the same as that of the refrigerant in the cooling front chamber operation. Hereinafter, description will be made focusing on the differences from FIG. 2.

A portion of the high-pressure gas refrigerant discharged from the first and second compressors 53 and 54 flows through the lamination part 57 and flows through the high-pressure gas pipe 63, and then flows into the high-pressure gas header 81. The refrigerant flowing out from the high pressure gas header 81 flows through the connection pipe 44 in the eighth chamber, and condenses in the fourth indoor heat exchanger 41 to flow into the liquid header 83. In the liquid header 83, both the refrigerant that has passed through the fourth indoor unit (B4) and the refrigerant that has passed through the outdoor heat exchanger (51) in order to flow out into the first, second, and third indoor units (B1) (B2) (B3) are introduced. do.

Here, if the indoor unit (for example, the first, second, and third indoor units (B1) (B2) (B3)) in the cooling operation is lowered below a predetermined temperature (-5 ° C) during simultaneous cooling subject operation, cooling operation Freezing occurs in the indoor unit. Such icing degrades the efficiency and reliability of the multi-air conditioner 100 simultaneously with heating and cooling. In order to prevent this, the opening value of the electromagnetic expansion valve 85 is adjusted to prevent freezing of indoor units (eg, first, second, and third indoor units B1, B2, and B3) that are in cooling operation.

Specifically, the opening value of the electromagnetic expansion valve 85 is adjusted so that the temperature of the refrigerant discharged from the indoor unit during the cooling operation is maintained at or above a predetermined temperature (-5 ° C). Preferably, the temperature sensor (first, 2, 3 temperature sensor 16) (26) installed in the discharge portion of the indoor unit (for example, the first, second, and third indoor units (B1), B2, (B3)) during cooling operation ) (36)) If the refrigerant temperature of the discharge part of the indoor unit during cooling operation is sensed, and if the temperature of the refrigerant becomes lower than the preset temperature, detecting this and adjusting the opening value of the electromagnetic expansion valve 85, the high-pressure gas header The high-pressure and high-temperature gas of 81 is bypassed to the low-pressure gas header 82 so that the temperature of the low-pressure gas refrigerant in the low-pressure gas header 82 rises. After that, the process is repeated every predetermined time to control the temperature of the refrigerant supplied to the indoor unit during the cooling operation to a predetermined temperature or higher.

Therefore, it is possible to prevent freezing of the indoor unit in the cooling operation while cooling the space (for example, the computer room) that requires cooling at an outdoor temperature (for example, in winter) that requires indoor heating. In addition, in order to prevent freezing of the indoor unit during cooling operation, it is not necessary to turn off the heating and cooling simultaneous multi-air conditioner 100, and continuous operation is possible.

5 shows the operation of the simultaneous heating and cooling type multi-air conditioner 100 and the flow of refrigerant accordingly. For convenience of explanation, it is assumed that the first, second, and third indoor units B1, B2, and B3 operate in a heating mode, and the fourth indoor unit B4 operates in a cooling mode. The flow of the refrigerant for operating the first, second, and third indoor units B1, B2, and B3 in the heating mode is the same as that of the refrigerant in the entire heating chamber operation. However, in the fourth chamber B4, after the high pressure liquid refrigerant flows from the liquid header 83 through the connection pipe 43 in the fourth chamber, it expands in the electromagnetic expansion valve 42 in the fourth chamber, and exchanges heat in the fourth chamber. After being evaporated in the group 41, it flows into the low pressure gas header 82. Thereafter, the refrigerant flows through the low pressure gas pipe 75 and then flows into the third discharge pipe 64 and mixes with the refrigerant evaporated in the outdoor heat exchanger 51.

Here, when the indoor unit in the cooling operation (for example, the fourth indoor unit B4) decreases below a certain temperature (-5 ° C) during simultaneous heating main operation, freezing occurs in the indoor unit during the cooling operation. Such icing degrades the efficiency and reliability of the multi-air conditioner 100 simultaneously with heating and cooling. In order to prevent this, the opening value of the electromagnetic expansion valve 85 is adjusted to prevent freezing of the indoor unit during cooling operation.

Specifically, the opening value of the electromagnetic expansion valve 85 is adjusted so that the temperature of the refrigerant discharged from the indoor unit (for example, the fourth indoor unit B4) in the cooling operation maintains a predetermined temperature (-5 ° C) or higher. do. Preferably, the temperature sensor (fourth sensor 46) installed in the discharge portion of the indoor unit during cooling operation senses the refrigerant temperature of the discharge portion of the indoor unit during cooling operation, and when the temperature of the refrigerant becomes lower than a preset temperature, this When sensing and adjusting the opening value of the electromagnetic expansion valve 85, the high pressure and high temperature gas of the high pressure gas header 81 is bypassed to the low pressure gas header 82, so that the temperature of the low pressure gas refrigerant in the low pressure gas header 82 is Will rise. Thereafter, the process is repeated every predetermined time to control the temperature of the refrigerant supplied to the indoor unit during the cooling operation to a predetermined temperature or higher.

Accordingly, it is possible to prevent freezing of the indoor unit during the cooling operation while cooling the space (for example, the computer room) that requires cooling at an outdoor temperature that requires indoor heating. In addition, in order to prevent freezing of the indoor unit during cooling operation, it is not necessary to turn off the heating and cooling simultaneous multi-air conditioner 100, and continuous operation is possible.

In the above, although the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims (8)

A plurality of indoor and outdoor air conditioners each including an indoor heat exchanger;
A compressor, an outdoor heat exchanger, and an outdoor unit for both air conditioning and heating including a switching unit disposed on the discharge side of the compressor to switch the flow of refrigerant; And
It is disposed between the outdoor unit for both air conditioning and heating and the indoor unit for air conditioning and heating, and includes a distributor for distributing the refrigerant to the indoor unit for air conditioning and heating according to the operating conditions of the air conditioning chamber, the heating chamber, the cooling main body simultaneously, and the heating main body,
The distributor,
A liquid header;
A low pressure gas header;
A high pressure gas header through which a refrigerant having a higher pressure than the refrigerant in the low pressure gas header flows;
A bypass pipe for bypassing the high pressure refrigerant of the high pressure gas header to the low pressure gas header;
It is disposed on the bypass pipe and includes a flow control unit for controlling the flow rate of the refrigerant bypassed from the high pressure gas header to the low pressure gas header,
The outdoor unit,
A liquid pipe connecting the outdoor heat exchanger and the distributor; And
Included in the liquid piping, a supercooling device for cooling the refrigerant flowing into the distributor during the cooling operation;
Further comprising a temperature sensor for detecting the temperature of the refrigerant discharged from the indoor unit for both air conditioning and heating,
The flow control unit receives a signal from the temperature sensor to control the flow rate of the bypassed refrigerant air-conditioning multi-air conditioner. According to claim 1,
The flow control unit includes an electronic expansion valve,
The supercooling device,
A supercooler installed around at least a portion of the liquid pipe;
A bypass pipe of the supercooler branched from the liquid pipe between the supercooler and the distributor to bypass some refrigerant into the supercooler;
An electronic expansion valve of a supercooler installed in a bypass pipe bypassing the supercooler; And
A recovery pipe connecting the supercooler and the compressor;
A multi-air conditioner for simultaneous heating and cooling, comprising a. delete According to claim 2,
In the simultaneous operation of the heating subject or the simultaneous operation of the cooling subject,
Simultaneous heating and cooling multi-air conditioner for adjusting the opening value of the electronic expansion valve of the flow control unit to prevent freezing of the indoor unit during cooling operation. According to claim 1,
In the simultaneous operation of the heating subject or the simultaneous operation of the cooling subject,
Simultaneous heating and cooling multi-air conditioner for adjusting the opening value of the electronic expansion valve of the flow control unit so that the temperature of the refrigerant discharged from the indoor / air-conditioning indoor units maintains a predetermined temperature or higher. According to claim 2,
When operating the air conditioning compartment,
A multi-air conditioner with simultaneous heating and cooling to open the electromagnetic expansion valve of the flow control unit. According to claim 2,
When operating the heating chamber,
Simultaneous multi-air conditioner for heating and cooling to close the electronic expansion valve of the flow control unit. According to claim 1,
The temperature sensor,
Simultaneous heating and cooling multi-air conditioner installed in a pipe connecting the indoor heat exchangers and the low pressure gas header.

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