KR101624529B1 - Multi-air conditioner for heating and cooling operations at the same time - Google Patents

Abstract

According to an embodiment of the present invention, a multi-air conditioner for heating and cooling operation at the same time comprises a plurality of indoor units for cooling and heating, an outdoor unit for cooling and heating, and a distributor. An outdoor heat exchanger comprises: a first heat exchange unit; a first distribution pipe; a first bypass pipe; a second heat exchange unit; a second distribution pipe; a first outdoor expansion valve; a second outdoor expansion valve; and a first restriction valve. An operation area domain comprises a first operation area, a second operation area, and a third operation area.

Description

[0001] The present invention relates to a multi-air conditioner,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-type air conditioner for simultaneous heating and cooling, and more particularly, to a multi-type air conditioner for simultaneous heating and cooling that satisfies various cooling and heating requirements.

In general, a multi-type air conditioner connects a plurality of indoor units to one outdoor unit, and uses a plurality of indoor units as an air conditioner or a radiator while using an outdoor unit as a common use.

In recent years, a plurality of compressors are provided or a plurality of outdoor units are connected in parallel to each other to effectively cope with cooling or heating loads depending on the number of indoor units.

The conventional multi-air conditioner 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 includes a main outdoor unit and a plurality of sub- And an outdoor unit.

Each of the plurality of outdoor units is provided with a compressor for compressing refrigerant in a gaseous state at a low temperature and a pressure at a high temperature and a high pressure, an outdoor heat exchanger for exchanging refrigerant circulating with outdoor air, and a four- Respectively. Each of the plurality of indoor units is provided with an expansion mechanism and an indoor heat exchanger for exchanging the circulated refrigerant with indoor air.

In the multi-type air conditioner according to the related art, the refrigerant compressed by the compressors of the main outdoor unit and the sub outdoor unit is sent to the outdoor heat exchanger by the four-way valve, and the refrigerant passing through the outdoor heat exchanger Is condensed by heat exchange with air, and then 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 room air, and thereby the room is cooled.

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 sequentially passes through the four-way valve, the indoor heat exchanger, the outdoor expansion valve (LEV), and the outdoor heat exchanger, .

Conventionally, in the case where a cooling capability of an indoor unit to be cooled during a simultaneous operation of a heating body is largely required, or when the indoor capacity of the indoor unit to be heated during simultaneous operation of the cooling body is required to be large, Lt; / RTI >

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-mode air conditioner that operates in various operating modes in accordance with a request for cooling and heating each indoor unit during cooling and heating operation.

A plurality of cooling / heating indoor units including a cooling / heating multi-unit indoor heat exchanger according to an embodiment of the present invention, a compressor, an outdoor heat exchanger, and a switching unit disposed on a discharge side of the compressor for switching the flow of refrigerant. A distributor for distributing the refrigerant to the cooling / heating combined indoor units according to simultaneous operation conditions of the cooling room, the heating room, the cooling subject, and the heating subject simultaneously; and a distributor disposed between the outdoor unit and the cooling / heating combined outdoor unit, The outdoor heat exchanger is operated as a condenser during simultaneous operation of the cooling chamber or the cooling subject and as an evaporator during the simultaneous operation of the heating chamber or the heating subject and is connected to the switching unit so that the refrigerant compressed in the compressor Is connected to the first connecting pipe through which the refrigerant flows, Exchanged in the first heat exchanging unit, the first heat exchanging unit performing the heat exchange, the first cooling unit in the first cooling unit, or the first cooling unit in the first heat exchanging unit during the simultaneous operation of the first distribution pipe, A first bypass pipe through which the refrigerant passes, a second heat exchange unit connected to the first bypass pipe for heat-exchanging the refrigerant with the air, a refrigerant heat-exchanged in the second heat exchange unit passes A first distribution pipe connected to the first distribution pipe; a first outdoor expansion valve disposed on the first distribution pipe for expanding or interrupting the refrigerant; and a second outdoor expansion valve disposed on the second distribution pipe for expanding the refrigerant, And a first intermittent valve disposed in the first bypass pipe and controlling the flow of the refrigerant by opening and closing the first outdoor valve, Wherein the operation region domain is operated in a first operation region and a second operation region in which the heating capability of the plurality of cooling and heating indoor units is higher than the first operation region, And a third operating region in which the heating capacity of the plurality of indoor units for cooling and heating is improved than the second operating region.

The multi-air conditioner according to the present invention has one or more of the following effects.

The embodiment has the effect of opening the electronic expansion valve provided in the bypass piping to bypass the refrigerant remaining in the high-pressure gas header to the low-pressure gas header, thereby preventing the system from being short of refrigerant.

Further, it is possible to prevent a freezing of the indoor unit during the cooling operation while cooling a space (for example, a computer room) requiring cooling in an outdoor temperature (especially winter season) requiring indoor heating.

In addition, there is an advantage that the multi-type air conditioner for simultaneous heating and cooling is not required to be turned off in order to prevent the indoor unit from being frozen during the cooling operation.

In addition, the embodiment has an advantage in that it has various operation modes corresponding to the cooling or heating demand of each indoor unit during the simultaneous cold and reverse operation.

FIG. 1 is a schematic block diagram of a multi-mode air conditioner according to an embodiment of the present invention. Referring to FIG.
Fig. 2 is an operation diagram showing the operation state of the air conditioner / multi-type air conditioner of Fig. 1 when the all-room air conditioner is operated.
Fig. 3 is an operation diagram showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 when the heating room is operated.
Fig. 4 is an operational diagram showing the operating state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the first operating region of simultaneous cooling operation.
Fig. 5 is an operational diagram showing the operating state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the second operation region of simultaneous cooling operation.
Fig. 6 is an operation diagram showing the operation state of the air-conditioning / cooling simultaneous multi-type air conditioner of Fig. 1 in the third operating region of simultaneous cooling operation.
7 is an operation diagram showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the fourth operation region of the simultaneous heating operation.
8 is an operation diagram showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the fifth operation region of the simultaneous heating operation.
9 is an operation diagram showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the sixth operation region of the simultaneous heating operation.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" Can be used to easily describe the correlation of components with other components. Spatially relative terms should be understood as terms that include different orientations of components at the time of use or operation, in addition to those shown in the drawings. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, and / or step does not exclude the presence or addition of one or more other elements, steps and / I never do that.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

In the drawings, the thickness and the size of each component are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size and area of each component do not entirely reflect actual size or area.

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

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

The outdoor unit A for cooling and heating includes first and second compressors 53 and 54, an outdoor heat exchanger, an outdoor heat exchanger fan 61 and a switching unit. Here, the switching unit includes a four-way valve (62). The suction portions 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 varying 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 joint portion 57 And the first and second oil separators 58 and 59 are connected to the first and second discharge pipes 55 and 56 so as to recover oil from the refrigerant discharged from the first and second compressors 53 and 54 Respectively. The first and second oil separators 58 and 59 are provided with first and second oil separators 58 and 59 for guiding the oil separated from the first and second oil separators 58 and 59 to the suction portions of the first and second compressors 53 and 54, And two oil return pipes 30 and 31 are connected. A suction pipe 64 is connected to the suction portion of the first and second compressors 53 and 54. A compressor pressure sensor 69 is disposed in the suction pipe 64. The compressor pressure sensor 69 senses the suction pressure of the compressor. The suction pressure value measured by the compressor pressure sensor 69 is outputted to a control unit (not shown).

A high-pressure gas pipe 63 for bypassing the refrigerant discharged from the first and second compressors 53 and 54 through the four-way valve 62 is connected to the joint portion 57. The joint portion 57 is connected by a four-way valve 57 and a third discharge pipe 68.

The outdoor heat exchanger is connected to the four-way valve (62) by a first connection pipe (71). In the outdoor heat exchanger, the refrigerant is condensed or evaporated by heat exchange with the outside air. At this time, in order to facilitate the heat exchange, the outdoor fan (61) flows air into the outdoor heat exchanger. In the cooling / heating simultaneous multi-function air conditioner 100, the outdoor heat exchanger is used as a condenser during the cooling operation or the cooling operation simultaneously, and the outdoor heat exchanger is used as the evaporator during the heating operation or the heating operation simultaneously.

The outdoor heat exchanger and the distributor (C) are connected by a liquid pipe (72). The refrigerant that has passed through the outdoor heat exchanger flows into the liquid pipe (72) during the operation of the heating room or the simultaneous operation of the heating body. For example, the outdoor heat exchanger can reduce the heat exchange between the refrigerant and the air during the operation of the heating room or simultaneously operate the heating body, and can maximize the efficiency by extending the heat exchange between the refrigerant and the air during the operation of the cooling room or the operation of the cooling subject. In addition, the refrigerant that has passed through the outdoor heat exchanger during the heating operation or the simultaneous operation of the heating main body expands.

Specifically, the outdoor heat exchanger is connected to a first connection pipe 71 through which the refrigerant compressed by the compressors 53 and 54 flows at the time of simultaneous operation of the cooling chamber or the cooling subject, so that the first heat exchange unit 51a A first bypass pipe 91 connected to the other side of the first heat exchanging unit 51a, a first distribution pipe 93 connected to the other side of the first heat exchanging unit 51a, A second bypass pipe 92 connected to the first bypass pipe 91 and the first bypass pipe 91 and a second heat exchanger 51b connected to the first bypass pipe 91 and heat- And a second distribution pipe 94 connected to the other side of the second heat exchanging part 51b and connected to the first distribution pipe 93.

One end of the first connection pipe (71) is connected to the four-way valve (62). The other end of the first connecting pipe 71 is connected to the first heat exchanging part 51a and the second bypass pipe 92. The first connecting pipe 71 is connected to one side of the first heat exchanging part 51a. The first connecting pipe 71 is connected to the plurality of refrigerant tubes of the first heat exchanging part 51a.

One side of the first heat exchanging part 51a is connected to the first connecting pipe 71 and the other side is connected to the first distributing pipe 93. The first heat exchanging part (51a) is composed of a plurality of refrigerant tubes through which the refrigerant flows and a plurality of heat transfer fins, and exchanges the refrigerant with air.

The first distribution pipe 93 is connected to the other side of the first heat exchanging part 51a. The first distribution pipe 93 is joined with the second distribution pipe 94 and connected to the liquid pipe 72. The first distribution pipe 93 passes the refrigerant that has passed through the first heat exchanging part 51a at the time of simultaneous operation of the cooling room or the cooling subject.

The first distribution pipe 93 is provided with a first outdoor expansion valve 65a for regulating the opening of the first distribution pipe 93. The first outdoor expansion valve (65a) can deflate, bypass or block the refrigerant passing through the first distribution pipe (93). The first outdoor expansion valve (65a) is controlled by the control unit to expand or interrupt the refrigerant.

One end of the first bypass pipe 91 is connected to the first heat exchanging unit 51a and the other end is connected to the second heat exchanging unit 51b. The first bypass pipe 91 is provided with a first intermittent valve 97 which is opened and closed to regulate the flow of the refrigerant. The first intermittent valve 97 is opened to allow the refrigerant to flow from the first heat exchanging portion 51a to the second heat exchanging portion 51b and to be closed from the second heat exchanging portion 51b to the first heat exchanging portion 51a It is possible to prevent the refrigerant from flowing. Specifically, the first bypass pipe 91 may be branched at the first distribution pipe 93.

One end of the second bypass pipe 92 is connected to the first connection pipe 71 and the other end is connected to the first bypass pipe 91. A first check valve 98 is disposed in the second bypass pipe 92. The first check valve 98 allows the refrigerant to flow from the first bypass pipe 91 to the first connection pipe 71 and flows from the first connection pipe 71 to the first bypass pipe 91 Prevent refrigerant from entering. Specifically, the first check valve 98 prevents the refrigerant from flowing into the first bypass pipe 91 from the first connection pipe 71 during the cooling operation.

The first bypass pipe 91 is connected to one side of the second heat exchanging part 51b. One side of the second heat exchanging part 51b is connected to the first bypass pipe 91 and the other side is connected to the second distribution pipe 94. The second heat exchanging portion 51b is composed of a plurality of refrigerant tubes through which refrigerant flows and a plurality of heat transfer fins, and exchanges heat with the refrigerant.

One end of the second distribution pipe 94 is connected to the second heat exchanging part 51b and the other end is connected to the liquid pipe 72 by being joined to the first distribution pipe 93. In the second distribution pipe (94), the refrigerant heat-exchanged in the second heat exchanging part (51b) is allowed to pass during the operation of the refrigerating room.

The second distribution pipe 94 is provided with a second outdoor expansion valve 65b for regulating the opening of the second distribution pipe 94. The second outdoor expansion valve (65b) can deflate, bypass or block the refrigerant passing through the second distribution pipe (94). The second outdoor expansion valve (65b) is controlled by the control unit to expand or interrupt the refrigerant.

Of course, the second distribution pipe 94 is connected to a distribution bypass pipe, and a check valve may be provided.

The outdoor expansion valves (65a) and (65b) expand the refrigerant during the operation of the heating room or the simultaneous heating operation. The supercooling device 66 cools the refrigerant which is moved to the distributor C when the cooling operation is performed or when the cooling operation is simultaneously performed. The outdoor expansion valves 65a and 65b are installed in the first, second, third, and fourth indoor heat exchangers 11, 21, 32, and 41, respectively, Expansion or cracking before.

The subcooling device 66 includes a supercooling device 66a installed to surround a part of the liquid pipe 72 and a subcooling device 66b disposed between the subcooler 66a and the distributor C to divide a part of the refrigerant moving to the distributor C A supercooling bypass pipe 66b for bypassing into the supercooler 66a, an electronic expansion valve 66c provided in the supercooling bypass pipe 66b, a subcooler 66a and a third discharge pipe 64, And a return pipe (66d) for connecting the pipe

The distributor C is disposed between the outdoor unit A for cooling and heating and the indoor units B1, B2, B3 and B4 for the first, second, third, fourth cooling and heating operations, (2), (3), (4), (4) and (5) according to the simultaneous operation of the main body and the heating subject simultaneously. The dispenser C includes a high pressure gas header 81, a low pressure gas header 82, a liquid header 83 and control valves (not shown).

The first, second, third, fourth cooling and heating indoor units B1, B2, B3 and B4 are connected to the first, second, third and fourth indoor heat exchangers 11, 21, 31, The first, second, third and fourth indoor electronic expansion valves 12, 22, 32 and 42 and the first, second and third indoor unit fans 15, 25, 35 and 45, . The first, second, third and fourth indoor heat exchangers 11, 21, 31 and 41 are connected to the first, second, third and fourth indoor heat exchangers 12, 22, 32 and 42, Second, third, and fourth indoor connection pipes 13, 23, 33, and 43 that connect the high-pressure gas header 81 and the high-pressure gas header 81 to each other.

In order to detect the temperature of the refrigerant discharged from the first, second, third, fourth cooling and heating indoor units B1, B2, B3, B4, (26), (36) and (46) may be installed. The first, second, third and fourth temperature sensors 16, 26, 36 and 46 are connected to the first, second, third and fourth indoor heat exchangers 11, 21, 31 and 41, 6, 7, 8 indoor connection piping 14, 24, 34, 44 connecting the low pressure gas header 82 to each other. Also, temperature sensors (not shown) may be installed in the first, second, third and fourth indoor heat exchangers 11, 21, 31 and 41 as well.

The high pressure gas header 81 is connected to one side of the high pressure gas pipe 63 and the first, second, third and fourth indoor heat exchangers 11, 21, 31 and 41 of the joint portion 57 do. The low pressure gas header 82 is connected to the suction pipe 64 by the low pressure gas pipe 75 and the low pressure gas header 82 of the first, And 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 and 41, respectively. The high pressure gas pipe 81 ', the low pressure gas header 82 and the liquid header 83 are connected to the high pressure gas pipe 63', the low pressure gas pipe 75 'and the liquid pipe 72' of another outdoor unit Respectively.

A bypass piping 84 is provided between the high pressure gas header 81 and the low pressure gas header 82. The bypass piping 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 piping 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 provided. The flow rate 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 during the cooling operation at the simultaneous operation of the heating body or the simultaneous operation of the cooling body. Or the flow rate regulator is opened during the operation of the all-cooling operation, bypassing the residual refrigerant remaining in the high-pressure gas header 81 to the low-pressure gas header 82. The flow rate regulating portion may be an electronic expansion valve (85).

Hereinafter, the operation of the multi-mode air-conditioning unit shown in FIG. 1 and the flow of refrigerant therein will be described with reference to FIGS. 2 to 9. FIG.

2 shows the operation of the multi-type air conditioner 100 during the cooling / heating operation and the flow of the refrigerant.

The high-pressure gas refrigerant discharged from the first and second compressors 53 and 54 flows through the first and second discharge pipes 55 and 56 and flows through the third discharge pipe 68 and the four- , And then flows into the outdoor heat exchanger. The high-pressure liquid refrigerant condensed in the outdoor heat exchanger flows into the liquid header 83 through the supercooling device 66. The refrigerant discharged from the liquid header 83 through the first, second, third and fourth indoor connection pipes 13, 23, 33 and 43 flows through the first, second, third and fourth indoor electronic expansion valves 12, 22, 32 and 42 and then evaporated in the first, second, third and fourth indoor heat exchangers 11, 21, 31 and 41 and the low pressure gas header 82, Lt; / RTI > The low-pressure gas refrigerant discharged from the low-pressure gas header 82 flows into the inlet and outlet piping 64 and then is sucked into the first and second compressors 53 and 54 via the accumulator 52.

Specifically, in the outdoor heat exchanger, the refrigerant is firstly condensed in the first heat exchanging part 51a, and the refrigerant having passed through the second heat exchanging part 51b flows into the first bypass pipe 91, (51b). The refrigerant flowing into the second heat exchanging part 51b is secondarily condensed in the second heat exchanging part 51b and discharged to the liquid pipe 72 through the second distribution pipe 94. [

Accordingly, in the embodiment, the refrigerant can be repeatedly condensed in succession to the plurality of heat exchanging units. Of course, various flow paths can be formed by opening and closing the first outdoor expansion valve 65a, the second outdoor expansion valve 65b, and the first intermittent valve 97.

At this time, the refrigerant does not flow into the high-pressure gas header 81 at the time of operating the all-cooling chamber, and the refrigerant remains in the high-pressure gas header 81. At this time, the electronic expansion valve 85 provided in the bypass piping 84 is opened to bypass the low-pressure gas header 82 with the refrigerant remaining in the high-pressure gas header 81. Therefore, the refrigerant remains in the high-pressure gas header 81 at the time of the operation of the all-cooling room, thereby preventing the refrigerant from being short-circuited in the system.

FIG. 3 shows the operation of the multi-type air conditioner 100 during the heating / cooling operation and the refrigerant flow 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 flows into the joint portions 57 and 56 without flowing into the four- And then flows into the high-pressure gas header 81 through the high-pressure gas pipe 63. The refrigerant discharged from the high pressure gas header 81 through the fifth, sixth, seventh and eighth indoor connection pipes 14, 24, 34 and 44 flows through the first, second, third and fourth indoor heat exchangers (11), (21), (31) and (41). Thereafter, the refrigerant flows into the liquid header 83, is discharged through the liquid pipe 72, expanded at the outdoor expansion valves 65a and 65b, and then flows into the first heat exchanging portion 51a and / or the second heat exchanging portion And evaporated at the portion 51b. The low temperature low pressure gas refrigerant flows into the suction pipe 64 through the four-way valve 62 and then is sucked into the first and second compressors 53 and 54 via the accumulator 52.

When the heating room is operated, the electronic expansion valve 85 is closed to prevent the refrigerant from flowing into the low pressure gas header 82 and insufficient refrigerant in the simultaneous cooling and heating type multi-type air conditioner 100.

In general, a multi-type air conditioner connects a plurality of indoor units to one outdoor unit, and uses a plurality of indoor units as an air conditioner or a radiator while using an outdoor unit as a common use.

When a plurality of cooling / heating indoor units are used as a radiator and a radiator, the air conditioner of the embodiment is defined as simultaneous heating / cooling operation. The simultaneous operation of cooling / heating and simultaneous operation of a plurality of cooling / heating indoor units requiring a high cooling capacity due to a large number of cooling / heating indoor units operating as coolers and a large number of heating / cooling indoor units operated by heaters among a plurality of cooling / And simultaneous operation of the heating subject in which the capability is required.

The multi-mode air conditioner of the embodiment is controlled to selectively operate the heating subject simultaneous operation and the cooling subject simultaneous operation based on a plurality of conditions (compressor suction pressure, inflow temperature of the indoor unit).

Particularly, in the case where the cooling capability of the indoor unit to be cooled during the simultaneous operation of the heating body is greatly required, or when the indoor ability of the indoor unit to be heated during the simultaneous operation of the cooling body is greatly required, exist.

In order to solve the above-described problems, the embodiment is controlled so as to operate in the operation domain domain partitioned into a plurality of operation regions at the time of simultaneous cooling and heating operation of a plurality of cooling / heating indoor units. Specifically, the operating domain domain at the time of the simultaneous operation of the cooling subject has a first operating region, a second operating region in which the heating capacity of the plurality of cooling / heating combined indoor units is improved, and a second operating region in which the plurality of cooling / And a third operating region in which the heating capability is improved. In addition, the operating domain domain at the time of simultaneous operation of the heating subject has a fourth operating region, a fifth operating region in which the cooling capacity of a plurality of cooling / heating combined-use indoor units is improved, and a fourth operating region in which a plurality of cooling / And a sixth operation region in which the capability is improved.

Specifically, in the embodiment, during the simultaneous operation of the cooling subject of the multi-type air conditioner, in order to move from one of the first operation region, the second operation region and the third operation region to the other according to the heating demand of the indoor unit to be heated .

Further, in the embodiment, during the simultaneous operation of the heating main body of the multi-type air conditioner, in order to be moved from one of the fourth operation region, the fifth operation region and the sixth operation region to another in accordance with the cooling demand of the cooled indoor unit .

Here, in the first operating region, the suction pressure of the compressor is less than the first suction pressure and is equal to or higher than the second suction pressure (first suction pressure> second suction pressure), and in the second operation region, Is less than the second suction pressure and is equal to or greater than the third suction pressure (second suction pressure> third suction pressure), and in the third operation area, the suction pressure of the compressor may be less than the third suction pressure. Here, the first to third suction pressures may be the pressure values measured by the compressor pressure sensor 69. The first to third suction pressures are values set by experiments.

In the first operating region, the suction temperature of the indoor / outdoor heating / cooling unit in the heating mode is lower than the first suction temperature and is equal to or higher than the second suction temperature (first suction temperature> second suction temperature) The intake temperature of the combined cooling and heating indoor unit is lower than the second suction temperature and is equal to or higher than the third suction temperature (second suction temperature> third suction temperature). In the third operation area, 3 is below the suction temperature. At this time, the first to third suction temperatures are controlled by the first, second, third, and fourth temperature sensors 16 provided in the first, second, third, fourth cooling and heating indoor units B1, B2, B3, (26), (36) and (46). In addition, when there are a plurality of indoor / outdoor heating / cooling indoor units, the intake temperature of the indoor unit may be an average value of the intake temperatures of the plurality of indoor units being heated.

In the fourth operating region, the suction pressure of the compressor is higher than the fourth suction pressure and lower than the fifth suction pressure (however, the fourth suction pressure is lower than the fifth suction pressure). In the fifth operation region, The suction pressure of the compressor is equal to or higher than the fifth suction pressure and is lower than the sixth suction pressure (however, the fifth suction pressure < sixth suction pressure), and in the sixth operation region, the suction pressure of the compressor is equal to or higher than the sixth suction pressure.

Further, in the embodiment, in the fourth operation region, the discharge temperature of the combined cooling and heating indoor unit in the cooling mode is higher than the first discharge temperature and lower than the second discharge temperature (the first discharge temperature is less than the second discharge temperature) In the second operation region, the discharge temperature of the cooling / heating combined indoor unit in the cooling mode is higher than the second discharge temperature and lower than the third discharge temperature (second discharge temperature < third discharge temperature) Is equal to or higher than the third discharge temperature. In this case, the first to third discharging temperatures are controlled by the first, second, third and fourth temperature sensors 16 provided in the first, second, third, fourth cooling and heating indoor units B1, B2, B3, (26), (36) and (46). When there are a plurality of cooling and heating indoor units in the cooling mode, the discharge temperature of the indoor unit may be an average value of the discharge temperatures of the plurality of indoor units under cooling.

Hereinafter, the operation of the multi-type air conditioner for simultaneous cooling and heating in the first operation region, the second operation region and the third operation region of the simultaneous cooling operation will be described.

Fig. 4 is an operation diagram showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the first operation region of simultaneous cooling operation. Fig. FIG. 6 is an operation diagram showing the operation state of the cooling / heating type multi-type air conditioner of FIG. 1 in the third operation region of simultaneous operation of cooling bodies.

4, for convenience of explanation, the first, second and third indoor units B1, B2, and B3 operate in the cooling mode in the first operation region and the fourth indoor unit B4 operates in the heating mode Let it work. The flow of the refrigerant for operating the first, second and third indoor units (B1), (B2) and (B3) in the cooling mode is the same as that of the refrigerant in the previous operation except for the explanation specifically. Hereinafter, differences from FIG. 2 will be mainly described.

A portion of the high pressure gas refrigerant discharged from the first and second compressors 53 and 54 flows through the high pressure gas pipe 63 through the joint portion 57 and then flows into the high pressure gas header 81. The refrigerant flowing out of the high pressure gas header 81 flows through the eighth indoor connection pipe 44 and then is condensed in the fourth indoor heat exchanger 41 and flows into the liquid header 83. In the liquid header 83, the refrigerant passing through the fourth indoor unit B4 and the refrigerant passing through the outdoor heat exchanger for flowing out to the first, second and third indoor units B1, B2, and B3 are all introduced.

A portion of the high-pressure gas refrigerant discharged from the first and second compressors 53 and 54 flows into the outdoor heat exchanger through the joint portion 57 via the four-way valve 62.

The first intermittent valve 97 is opened and the switching unit allows the refrigerant compressed in the compressor to flow into the first connection pipe 71 and the first outdoor expansion valve 65a And the second outdoor expansion valve 65b is controlled to be open. Although not shown in the drawings, all the controls described below are performed by a control unit (not shown).

The flow of the refrigerant in the outdoor heat exchanger in the first operation region is as follows. The refrigerant is firstly condensed in the first heat exchanging part 51a and the refrigerant having passed through the second heat exchanging part 51b flows into the first bypass pipe 91 and flows out to the second heat exchanging part 51b. The refrigerant flowing into the second heat exchanging part 51b is secondarily condensed in the second heat exchanging part 51b and discharged to the liquid pipe 72 through the second distribution pipe 94. [

Therefore, in the embodiment, since the refrigerant is repeatedly and repeatedly condensed in succession in the plurality of heat exchanging units, it is possible to supply a large cooling capacity in the indoor unit. However, at this time, the heating capacity of the indoor unit B4 being heated in the first operation region is the lowest among the first to third operation regions.

Here, when the indoor units (for example, the first, second, and third indoor units B1, B2, and B3) that are in the cooling operation during the simultaneous operation of the cooling subject are lowered to a certain temperature Freezing occurs in the indoor unit. This icing lowers the efficiency and reliability of the multi-mode air conditioner 100. In order to prevent this, the opening value of the electronic expansion valve 85 is adjusted to prevent freezing of the indoor units (for example, the first, second, and third indoor units B1, B2, and B3) in the cooling operation.

Specifically, the opening value of the electronic expansion valve 85 is adjusted so that the temperature of the refrigerant discharged from the indoor unit during the cooling operation is maintained at a predetermined temperature (-5 캜) or higher. (First, second and third temperature sensors 16, 26 (first, second and third indoor units B1, B2, B3) provided in the discharging portion of the indoor units (for example, (36) detects the refrigerant temperature of the discharging portion of the indoor unit in the cooling operation, and when the temperature of the refrigerant becomes lower than the preset temperature, it senses the refrigerant temperature and adjusts the opening value of the electronic expansion valve (85) The high pressure and high temperature gas of the low 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 raised. Then, this process is repeated at predetermined time intervals to control the temperature of the refrigerant supplied to the indoor unit in the cooling operation to a predetermined temperature or higher.

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

5, for convenience of explanation, the first, second and third indoor units B1, B2, and B3 operate in the cooling mode and the fourth indoor unit B4 operates in the heating mode Let it work. The flow of the refrigerant for operating the first, second, and third indoor units B1, B2, and B3 in the cooling mode is the same as the flow of the refrigerant in the first operating region except for the special operation. Hereinafter, differences from FIG. 4 will be mainly described.

A portion of the high-pressure gas refrigerant discharged from the first and second compressors 53 and 54 flows into the outdoor heat exchanger through the joint portion 57 via the four-way valve 62.

In the second operating region, the embodiment allows the first intermittent valve 97 to be opened and the switching unit to cause the refrigerant compressed in the compressor to flow into the first connecting pipe 71, and the first outdoor expansion valve 65a And the second outdoor expansion valve 65b is controlled to be open.

Accordingly, the flow of the refrigerant in the outdoor heat exchanger in the second operation region is as follows. The refrigerant is primarily condensed in the first heat exchanging portion 51a. A part of the refrigerant condensed first in the first heat exchanging part (51a) is discharged to the liquid pipe (72) through the first distribution pipe (93). Another part of the refrigerant condensed first in the first heat exchanging part 51a is supplied to the second heat exchanging part 51b through the first bypass pipe 91 and the refrigerant introduced into the second heat exchanging part 51b flows Is condensed secondarily and merged with the refrigerant discharged to the first distribution pipe (93) through the second distribution pipe (94).

Therefore, in the embodiment, a part of the refrigerant is condensed several times in the plurality of heat exchanging parts, and the other part of the refrigerant is condensed once. Therefore, the embodiment can supply the intermediate cooling capacity to the indoor unit under cooling and the middle heating capacity of the indoor unit during the heating. Here, the heating capacity of the indoor unit B4 to be heated in the second operation region is a median among the first to third operation regions.

6, for the sake of convenience of explanation, the first, second and third indoor units B1, B2 and B3 operate in the cooling mode and the fourth indoor unit B4 operates in the heating mode Let it work. The flow of the refrigerant for operating the first, second, and third indoor units B1, B2, and B3 in the cooling mode is the same as the flow of the refrigerant in the all-room heating operation except for the specific description. Hereinafter, differences from FIG. 3 will be mainly described.

However, after the high-pressure liquid refrigerant is introduced into the first to third indoor units B1 to B3 from the liquid header 83 through the first to third indoor connection pipes 13, 23 and 33, The refrigerant is expanded in the indoor electronic expansion valves 12, 22 and 32 and evaporated in the first to third indoor heat exchangers 11, 21 and 31 and then introduced into the low pressure gas header 82. Thereafter, the refrigerant flows through the low-pressure gas pipe 75, then flows into the third discharge pipe 64, and is mixed with the refrigerant evaporated in the outdoor heat exchanger.

In the third operating region, in the embodiment, the first intermittent valve 97 is opened, the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor, the first outdoor expansion valve 65a is opened, The outdoor expansion valve 65b is controlled to be open. That is, in the third operation region, the switching unit (four-way valve) is switched when the heating demand of the indoor unit being heated is large, so that the flow of the refrigerant in the outdoor unit has a flow similar to the simultaneous operation of the heating subject.

The flow of the refrigerant in the outdoor heat exchanger in the third operation region is as follows. The refrigerant introduced through the liquid pipe (72) is branched into the first distribution pipe (93) and the second distribution pipe (94). The refrigerant introduced into the first distribution pipe 93 is expanded in the first outdoor expansion valve 65a. The refrigerant introduced into the second distribution pipe 94 is expanded in the second outdoor expansion valve 65b and then evaporated in the second heat exchange section 51b and discharged to the first bypass pipe 91. [

A part of the refrigerant flowing into the first bypass pipe 91 is condensed by the refrigerant of the first distribution pipe 93 and evaporated in the first heat exchanging part 51a and discharged to the first and second compressors 53 and 54 And the other part of the refrigerant introduced into the first bypass pipe 91 is discharged to the first connection pipe 71.

A part of the refrigerant flowing into the first bypass pipe 91 is discharged to the first distribution pipe 93 and merged with the refrigerant expanded in the first outdoor expansion valve 65a. The refrigerant merged in the first distribution pipe 93 is evaporated in the first heat exchanging part 51a, merged with the refrigerant flowing out to the second bypass pipe, and discharged to the first and second compressors 53 and 54

Accordingly, in the embodiment, in some of the plurality of outdoor heat exchanging units, a part of the refrigerant is evaporated several times, and the other part of the refrigerant is evaporated once. Therefore, the embodiment can supply a cooling capacity of a weak degree to the indoor unit being cooled, and can supply a strong heating capacity of the indoor unit being heated. Here, the heating capacity of the indoor unit B4 being heated in the third operation region is the highest among the first to third operation regions.

Hereinafter, the operation of the multi-mode air conditioner in the fourth operation region, the fifth operation region and the sixth operation region of the simultaneous heating operation will be described.

Fig. 7 is an operational view showing the operation state of the cooling / heating simultaneous multi-type air conditioner of Fig. 1 in the fourth operation region of the simultaneous heating operation. Fig. FIG. 9 is an operational diagram showing the operation state of the cooling / heating type multi-type air conditioner of FIG. 1 in the sixth operation region of the simultaneous heating operation.

7, the first, second and third indoor units B1, B2, and B3 operate in the heating mode and the fourth indoor unit B4 operates in the cooling mode in the fourth operation region Let it work. 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 the flow of the refrigerant in the preheating operation. In the fourth indoor unit B4, the high-pressure liquid refrigerant flows from the liquid header 83 through the fourth indoor connection pipe 43, is expanded in the fourth indoor expansion valve 42, and the fourth indoor heat exchange Vaporized in the gas 41, and then introduced into the low-pressure gas header 82. Thereafter, the refrigerant flows through the low-pressure gas pipe 75, then flows into the third discharge pipe 64, and is mixed with the refrigerant evaporated in the outdoor heat exchanger.

In the fourth operating region, in the embodiment, the first intermittent valve 97 is closed, the switching unit causes refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor, the first outdoor expansion valve 65a is opened, The outdoor expansion valve 65b is controlled to be open.

The flow of the refrigerant in the outdoor heat exchanger in the fourth operation region is as follows. The refrigerant introduced through the liquid pipe (72) is branched into the first distribution pipe (93) and the second distribution pipe (94). The refrigerant introduced into the second distribution pipe 94 is expanded in the second outdoor expansion valve 65b and then evaporated in the second heat exchange portion 51b and discharged to the first bypass pipe 91, The refrigerant flowing into the path piping 91 is discharged to the first connecting piping 71 through the second bypass piping 92. The refrigerant introduced into the first distribution pipe 93 is expanded in the first outdoor expansion valve 65a and evaporated in the first heat exchange portion 51a and merged with the refrigerant discharged from the second bypass pipe 92 And is discharged to the first and second compressors 53 and 54.

Accordingly, in the embodiment, the refrigerant is evaporated in parallel in the plurality of outdoor heat exchanging units. Therefore, the embodiment can supply the heating capacity of a strong degree to the indoor unit being heated, and the cooling capacity of the indoor unit to be cooled can be supplied to a weak degree. Here, the cooling capacity of the indoor unit B4 being cooled in the fourth operation region is the lowest among the fourth to sixth operation regions.

Here, when the indoor unit (for example, the fourth indoor unit B4) that is in the cooling operation during the simultaneous operation of the heating main body is lowered to a certain temperature (-5 캜) or less, freezing occurs in the indoor unit in the cooling operation. This icing lowers the efficiency and reliability of the multi-mode air conditioner 100. In order to prevent this, the opening value of the electronic expansion valve 85 is adjusted to prevent freezing of the indoor unit in the cooling operation.

Specifically, the opening value of the electronic expansion valve 85 is controlled so that the temperature of the refrigerant discharged from the indoor unit (for example, the fourth indoor unit B4) in the cooling operation is maintained at a predetermined temperature do. Preferably, the temperature sensor (fourth temperature sensor 46) provided in the discharging portion of the indoor unit that is in the cooling operation senses the refrigerant temperature of the discharging portion of the indoor unit during the cooling operation, and when the temperature of the refrigerant becomes lower than the predetermined temperature, 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 . Then, this process is repeated at predetermined time intervals to control the temperature of the refrigerant supplied to the indoor unit in the cooling operation to a predetermined temperature or higher.

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

Referring to FIG. 8, for convenience of explanation, the first, second and third indoor units B1, B2, and B3 operate in the heating mode in the fifth operation region and the fourth indoor unit B4 operates in the cooling mode Let it work. 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 the flow of the refrigerant in the fourth operation region.

In the fifth operating region, in the embodiment, the first intermittent valve 97 is closed and the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor, the first outdoor expansion valve 65a is opened, And the two outdoor expansion valves 65b are controlled to be closed.

The flow of the refrigerant in the outdoor heat exchanger in the fifth operation region is as follows. The refrigerant introduced through the liquid pipe 72 flows into the first distribution pipe 93. The refrigerant flowing into the first distribution pipe 93 is expanded in the first outdoor expansion valve 65a, (51a), and the refrigerant evaporated in the first heat exchanging part (51a) is discharged to the first and second compressors (53, 54). Here, the refrigerant does not flow into the second heat exchanging portion 51b.

Therefore, in the embodiment, the refrigerant is evaporated only in one of the plurality of outdoor heat exchanging units. Therefore, the embodiment can supply the intermediate heating capacity to the indoor unit being heated, and the intermediate cooling capacity of the indoor unit being air-conditioned. Here, the cooling capacity of the indoor unit B4 under cooling in the fifth operation region is a median among the fourth operation region to the sixth operation region.

9, the first, second and third indoor units B1, B2, and B3 operate in the heating mode and the fourth indoor unit B4 operates in the cooling mode in the sixth operation region Let it work. 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 the flow of the refrigerant in the fourth operation region.

In the sixth operating area, the embodiment allows the first intermittent valve to be opened and the switching unit to cause the refrigerant heat exchanged in the outdoor heat exchanger to flow into the compressor, the first outdoor expansion valve (65a) is opened, and the second outdoor expansion The valve 65b is controlled to open.

The flow of the refrigerant in the outdoor heat exchanger in the sixth operation region is as follows. The refrigerant flowing through the liquid pipe (72) flows into the first distribution pipe (93) and the second distribution pipe (94).

The refrigerant introduced into the first distribution pipe 93 is expanded in the first outdoor expansion valve 65a and the refrigerant introduced into the second distribution pipe 94 is expanded in the second outdoor expansion valve 65b, A part of the refrigerant evaporated in the second heat exchanging part 51b and discharged to the first bypass piping 91 and part of the refrigerant flowing into the first bypass piping 91 flows through the second bypass piping 92, (71). Another part of the refrigerant flowing into the first bypass pipe 91 is discharged to the first distribution pipe 93 and merged with the refrigerant expanded in the first outdoor expansion valve 65a. The refrigerant merged in the first distribution pipe 93 is evaporated in the first heat exchanging part 51a, merged with the refrigerant flowing out to the second bypass pipe, and discharged to the first and second compressors 53 and 54

Accordingly, in the embodiment, in some of the plurality of outdoor heat exchanging units, a part of the refrigerant is evaporated several times, and the other part of the refrigerant is evaporated once. The embodiment can supply a weak heating capacity to the indoor unit being heated and can supply a strong cooling capacity of the indoor unit being air-conditioned. Here, the cooling capacity of the indoor unit B4 under cooling in the sixth operation region is the highest among the fourth to sixth operation regions.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (17)

A plurality of cooling / heating indoor units each including an indoor heat exchanger;
An outdoor heat exchanger including a compressor, an outdoor heat exchanger, and a switching unit disposed on a discharge side of the compressor for switching the flow of the refrigerant; And
A distributor disposed between the combined cooling / heating outdoor unit and the cooling / heating combined indoor units to distribute the refrigerant to the cooling / heating combined indoor units according to simultaneous operation conditions of the cooling room, the heating room, the cooling subject and the heating subject simultaneously; Lt; / RTI &gt;
The outdoor heat exchanger (1)
The cooling chamber or the cooling body is operated as a condenser during the simultaneous operation and the evaporator during the simultaneous operation of the heating chamber or the heating body,
A first heat exchange unit connected to the switching unit to be connected to a first connection pipe through which the refrigerant compressed in the compressor flows, and to heat-exchange the refrigerant with the air when the refrigerating chamber or the cooling body simultaneously operates;
A first distribution pipe through which the refrigerant heat-exchanged in the first heat exchanging part is passed when the entire cooling room or the cooling subject is simultaneously operated;
A first bypass pipe through which the refrigerant heat-exchanged in the first heat exchanging unit passes during simultaneous operation of the cooling room or the cooling subject;
A second heat exchanger connected to the first bypass pipe for exchanging heat between the refrigerant and the air;
A second distribution pipe through which the refrigerant heat-exchanged in the second heat exchanger passes and is interlocked with the first distribution pipe during simultaneous operation of the cooling room or the cooling subject;
A first outdoor expansion valve disposed on the first distribution pipe for expanding or interrupting the refrigerant;
A second outdoor expansion valve disposed on the second distribution pipe for expanding or interrupting the refrigerant; And
And a first intermittent valve which is disposed in the first bypass pipe and opens and closes to regulate the flow of the refrigerant,
Wherein the plurality of cooling / heating indoor units are operated in an operation region domain partitioned into a plurality of operation regions,
Wherein the operating domain domain comprises:
A first operating region;
A second operation region in which the heating capacity of the plurality of indoor units for cooling and heating is improved than the first operation region; And
And a third operating region in which the heating capacity of the plurality of indoor units for cooling and heating is higher than the second operating region.
The method according to claim 1,
In the first operating region, the suction pressure of the compressor is less than the first suction pressure and is equal to or higher than a second suction pressure (only first suction pressure> second suction pressure)
In the second operation region, the suction pressure of the compressor is less than the second suction pressure, and is equal to or more than the third suction pressure (second suction pressure> third suction pressure)
Wherein in the third operating region, the suction pressure of the compressor is less than a third suction pressure. 3. The method according to claim 1 or 2,
In the first operation region, the suction temperature of the indoor / outdoor air-conditioning indoor unit in the heating state is lower than the first suction temperature and is equal to or higher than the second suction temperature (the first suction temperature> the second suction temperature)
In the second operation region, the suction temperature of the indoor / outdoor unit for heating and cooling is lower than the second suction temperature and is equal to or higher than the third suction temperature (second suction temperature> third suction temperature)
Wherein the suction temperature of the indoor air-cooling / heating unit in the heating mode is lower than the third suction temperature in the third operation region.
The method according to claim 1,
A second bypass pipe connecting the first bypass pipe and the first connection pipe,
Further comprising a first check valve disposed in the second bypass pipe for preventing a refrigerant from flowing into the first bypass pipe from the first connection pipe during a cooling operation. 5. The method of claim 4,
In the first operating region,
The first intermittent valve is opened,
Wherein the switching unit causes the refrigerant compressed in the compressor to flow into the first connecting pipe,
The first outdoor expansion valve is closed,
And the second outdoor expansion valve is controlled to be opened. 5. The method of claim 4,
In the second operation region,
The first intermittent valve is opened,
Wherein the switching unit causes the refrigerant compressed in the compressor to flow into the first connecting pipe,
The first outdoor expansion valve is opened,
And the second outdoor expansion valve is controlled to be opened. 5. The method of claim 4,
In the third operation region,
The first intermittent valve is opened,
Wherein the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor,
The first outdoor expansion valve is opened,
And the second outdoor expansion valve is controlled to be opened. A plurality of cooling / heating indoor units each including an indoor heat exchanger;
An outdoor heat exchanger including a compressor, an outdoor heat exchanger, and a switching unit disposed on a discharge side of the compressor for switching the flow of the refrigerant; And
A distributor disposed between the combined cooling / heating outdoor unit and the cooling / heating combined indoor units to distribute the refrigerant to the cooling / heating combined indoor units according to simultaneous operation conditions of the cooling room, the heating room, the cooling subject and the heating subject simultaneously; Lt; / RTI &gt;
The outdoor heat exchanger (1)
The cooling chamber or the cooling body is operated as a condenser during the simultaneous operation and the evaporator during the simultaneous operation of the heating chamber or the heating body,
A first heat exchange unit connected to the switching unit to be connected to a first connection pipe through which the refrigerant compressed in the compressor flows, and to heat-exchange the refrigerant with the air when the refrigerating chamber or the cooling body simultaneously operates;
A first distribution pipe through which the refrigerant heat-exchanged in the first heat exchanging part is passed when the entire cooling room or the cooling subject is simultaneously operated;
A first bypass pipe through which the refrigerant heat-exchanged in the first heat exchanging unit passes during simultaneous operation of the cooling room or the cooling subject;
A second heat exchanger connected to the first bypass pipe for exchanging heat between the refrigerant and the air;
A second distribution pipe through which the refrigerant heat-exchanged in the second heat exchanger passes and is interlocked with the first distribution pipe during simultaneous operation of the cooling room or the cooling subject;
A first outdoor expansion valve disposed on the first distribution pipe for expanding or interrupting the refrigerant;
A second outdoor expansion valve disposed on the second distribution pipe for expanding or interrupting the refrigerant;
A first intermittent valve disposed in the first bypass pipe and opened and closed to regulate the flow of the refrigerant;
A second bypass pipe connecting the first bypass pipe and the first connection pipe; And
And a first check valve disposed in the second bypass pipe for preventing the refrigerant from flowing into the first bypass pipe from the first connection pipe when the cooling air chamber is in operation,
Wherein the plurality of cooling and heating indoor units are operated in an operation region domain partitioned into a plurality of operation regions,
Wherein the operating domain domain comprises:
A fourth operating region;
A fifth operation region in which the cooling capability of the plurality of indoor units for cooling and heating is improved more than the fourth operation region;
And a sixth operation region in which the cooling capacity of the plurality of indoor units for cooling and heating is improved than the fifth operation region. 9. The method of claim 8,
In the fourth operation region, the suction pressure of the compressor is higher than the fourth suction pressure, and is lower than the fifth suction pressure (however, the fourth suction pressure is less than the fifth suction pressure)
In the fifth operating region, the suction pressure of the compressor is higher than the fifth suction pressure, and is lower than the sixth suction pressure (however, the fifth suction pressure < sixth suction pressure)
Wherein in the sixth operation region, the suction pressure of the compressor is equal to or higher than a sixth suction pressure. 10. The method according to claim 8 or 9,
In the fourth operation region, the discharge temperature of the air-conditioning / cooling indoor unit in cooling is higher than the first discharge temperature and lower than the second discharge temperature (the first discharge temperature is lower than the second discharge temperature)
In the fifth operation region, the discharge temperature of the air-conditioning / cooling indoor unit in cooling is higher than the second discharge temperature and lower than the third discharge temperature (the second discharge temperature is lower than the third discharge temperature)
Wherein the discharge temperature of the indoor / outdoor air-conditioning unit in the cooling mode in the sixth operation region is equal to or higher than the third discharge temperature. 9. The method of claim 8,
In the fourth operation region,
The first intermittent valve is closed,
Wherein the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor,
The first outdoor expansion valve is opened,
And the second outdoor expansion valve is controlled to be opened. 9. The method of claim 8,
In the fifth operation region,
The first intermittent valve is closed,
Wherein the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor,
The first outdoor expansion valve is opened,
And the second outdoor expansion valve is controlled to be closed. 9. The method of claim 8,
In the sixth operation region,
The first intermittent valve is opened,
Wherein the switching unit causes the refrigerant heat-exchanged in the outdoor heat exchanger to flow into the compressor,
The first outdoor expansion valve is opened,
And the second outdoor expansion valve is controlled to be opened. A plurality of cooling / heating indoor units each including an indoor heat exchanger;
An outdoor heat exchanger including a compressor, an outdoor heat exchanger, and a switching unit disposed on a discharge side of the compressor for switching the flow of the refrigerant; And
And a distributor disposed between the outdoor unit for cooling and heating and the indoor units for combined cooling and heating and distributing the refrigerant to the cooling and heating indoor units according to the simultaneous operation conditions of the cooling room, the heating room, the cooling subject,
The outdoor heat exchanger (1)
The cooling chamber or the cooling body is operated as a condenser during the simultaneous operation and the evaporator during the simultaneous operation of the heating chamber or the heating body,
A first heat exchange unit connected to the switching unit to be connected to a first connection pipe through which the refrigerant compressed in the compressor flows, and to heat-exchange the refrigerant with air when the refrigerating chamber or the cooling body simultaneously operates;
A first distribution pipe through which the refrigerant heat-exchanged in the first heat exchanging part is passed when the entire cooling room or the cooling subject is simultaneously operated;
A first bypass pipe through which the refrigerant heat-exchanged in the first heat exchanging unit passes during simultaneous operation of the cooling room or the cooling subject;
A second heat exchanger connected to the first bypass pipe for exchanging heat between the refrigerant and the air;
A second distribution pipe through which the refrigerant heat-exchanged in the second heat exchanger passes and is interlocked with the first distribution pipe during simultaneous operation of the cooling room or the cooling subject;
A first outdoor expansion valve disposed on the first distribution pipe for expanding or interrupting the refrigerant;
A second outdoor expansion valve disposed on the second distribution pipe for expanding or interrupting the refrigerant;
A first intermittent valve disposed in the first bypass pipe and opened and closed to regulate the flow of the refrigerant;
A third bypass pipe connecting the first bypass pipe and the first connection pipe; And
And a first check valve disposed in the third bypass pipe for preventing a refrigerant from flowing into the first bypass pipe from the first connection pipe during a cooling operation,
Wherein the plurality of cooling / heating indoor units are operated in an operation region domain partitioned into a plurality of operation regions,
Wherein the plurality of indoor units are operated in an operation region domain partitioned into a plurality of operation regions,
The operating domain domain at the time of simultaneous operation of the cooling subject,
A first operating region;
A second operation region in which the heating capacity of the plurality of indoor units for cooling and heating is improved than the first operation region; And
And a third operation region in which the heating capacity of the plurality of indoor units for cooling and heating is improved than the second operation region,
The operation domain domain at the time of simultaneous operation of the heating subject,
A fourth operating region;
A fifth operation region in which the cooling capability of the plurality of indoor units for cooling and heating is improved more than the fourth operation region; And
And a sixth operation region in which the cooling capability of the plurality of indoor units for cooling and heating is improved than the fifth operation region. The method according to claim 1 or 8,
Wherein the distributor comprises:
A liquid header;
A low pressure gas header;
And a high-pressure gas header through which a refrigerant having a higher pressure than that of the refrigerant in the low-pressure gas header flows. 16. The method of claim 15,
Wherein the distributor comprises:
A bypass pipe for bypassing the high pressure refrigerant in the high pressure gas header to the low pressure gas header;
Further comprising a flow rate adjusting unit disposed on the bypass piping to control a flow rate of a refrigerant bypassed from the high pressure gas header to the low pressure gas header. 17. The method of claim 16,
During simultaneous operation of the heating subject or the cooling subject,
Wherein the flow rate control unit controls the flow rate of the refrigerant bypassed by the indoor unit so that the temperature of the refrigerant discharged from the cooling / heating combined indoor units is maintained at a predetermined temperature or higher.

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