KR20190132081A - Air-conditioning system and pipe connection searching method of the same - Google Patents

Abstract

According to an embodiment of the present invention, an air conditioning system comprises: a compressor configured to discharge a refrigerant sucked into a suction flow path to a discharge flow path; a common four-way sides enabling the discharge flow path or the suction flow path to be selectively connected to an outdoor heat exchanger; first and second four-way sides parallel-connected to the discharge flow path and the suction flow path; a plurality of first-system indoor units parallel-connected to the first four-way sides to be selectively connected to the discharge flow path or the suction flow path; a plurality of second-system indoor units parallel-connected to the second four-way sides to be selectively connected to the discharge flow path or the suction flow path; and a liquid flow path enabling the plurality of first-system indoor units and the second-system indoor units to be connected to the outdoor heat exchanger.

Description

Air-conditioning system and pipe connection searching method of the same}

The present invention relates to an air conditioning system and a pipe searching method of an air conditioning system, and more particularly, to an air conditioning system and a pipe searching method of an air conditioning system capable of simultaneous heating and cooling.

An air conditioning system, generally called an air conditioner, is a cooling system that cools a room by a repetitive action of inhaling hot air in a room, exchanging heat with a low temperature refrigerant, and then discharging it into the room. Heating system. The air conditioning system consists of a compressor-condenser-expansion mechanism-evaporator to form a series of cycles.

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

The multi-type air conditioner according to the prior art includes a distributor disposed between the outdoor unit and the indoor unit and distributing the refrigerant to the indoor unit according to the cooling and heating requirements of each indoor unit. That is, simultaneous operation of heating and cooling without a distributor was not possible, and a separate electrical box was required for the distributor to control a plurality of valves included in the distributor.

KR 10-1624529B1 (registered May 20, 2016)

An object of the present invention is to provide an air conditioning system capable of simultaneous heating and cooling without a distributor and a pipe searching method of the air conditioning system.

The air conditioning system according to the embodiment of the present invention includes a plurality of first system indoor units connected in parallel to the first four sides and a plurality of second system indoor units connected in parallel to the second four sides, thereby providing a first system. Either one of the indoor unit and the second system indoor unit is allowed to operate simultaneously with the heating and cooling of the air-conditioning operation of the other side is heated.

More specifically, the air conditioning system according to the embodiment of the present invention, a compressor for discharging the refrigerant sucked into the suction flow path to the discharge flow path; A common four-sided valve for selectively communicating the discharge passage or the suction passage with an outdoor heat exchanger; First and second quadrilateral sides connected in parallel to the discharge passage and the suction passage; A plurality of first system indoor units connected in parallel to the first four sides and selectively communicating with the discharge passage or the suction passage; A plurality of second system indoor units connected in parallel to the second four sides and selectively communicating with the discharge passage or the suction passage; And a liquid flow path connecting the plurality of first indoor units and the plurality of second indoor units to the outdoor heat exchanger.

A first suction side connection channel connected to the first four sides and in communication with the suction channel; A first discharge side connection passage connected to the first four sides and in communication with the discharge passage; A second suction side connection path connected to the second four sides and in communication with the suction path; And a second discharge side connection passage connected to the second four sides and in communication with the discharge passage.

A first temperature sensor provided in the first suction side connection passage; And a second temperature sensor provided at the second suction side connection flow path.

A first gas passage connected to the first four sides and selectively communicating with the first discharge side connection passage or the first suction side connection passage; A plurality of first gas branch passages branched from the first gas passages and connected to the plurality of first system indoor units, respectively; A second gas passage connected to the second four sides and selectively communicating with the second discharge side connection passage or the second suction side connection passage; And a plurality of second gas branch passages branched from the second gas passages and connected to the plurality of second system indoor units, respectively.

The apparatus may further include a plurality of liquid branch passages which are branched from the liquid passage and connected to the plurality of first system indoor units and the plurality of second system indoor units, respectively.

In an all-room cooling operation in which cooling is performed in a plurality of first indoor units and a plurality of second indoor units, the common four sides communicate the outdoor heat exchanger with the discharge passage, and the first four sides correspond to the plurality of indoor units. The first system indoor unit may be in communication with the suction flow path, and the second quadrilateral may communicate the plurality of second system indoor units with the suction flow path.

In all-room heating operation in which heating is performed in a plurality of first system indoor units and a plurality of second system indoor units, the common four sides communicates the outdoor heat exchanger with the suction flow path, and the first four sides is connected to the plurality of indoor units. A first system indoor unit may communicate with the discharge flow path, and the second four-sided side may communicate the plurality of second system indoor units with the discharge flow path.

In the simultaneous heating and cooling operation in which cooling is performed in a plurality of first system indoor units and heating is performed in a plurality of second system indoor units, the common four sides communicates the outdoor heat exchanger with the suction flow path, and the first four sides May communicate the plurality of first system indoor units with the suction passage, and the second four-sided side may communicate the plurality of second system indoor units with the discharge passage.

On the other hand, the pipe search method of the air conditioning system according to an embodiment of the present invention, when the specific indoor unit of the plurality of indoor units, when the refrigerant passes through either of the first four sides and the second four sides. It can be determined using the 1, 2 temperature sensor, thereby matching the particular indoor unit with any one of the first and second sides.

More specifically, the pipe searching method of the air conditioning system according to an embodiment of the present invention, the first operation step of turning on any one of the plurality of indoor units; An initial matching step of matching any one indoor unit with the first or second quadrilateral according to the sensed temperature of the first temperature sensor; An operation step of turning on another indoor unit of the plurality of indoor units; And when the one indoor unit is matched with the first square side, matches the other indoor unit with the first or second quadrangle according to the detected temperature of the second temperature sensor. If one indoor unit is matched with a second quadrilateral, a matching step of matching the other indoor unit with the first or second quadrilateral according to the detected temperature of the first temperature sensor may be included. have.

An off step of turning off the other indoor unit; An additional operation step of turning on another indoor unit of the plurality of indoor units; And when the one indoor unit is matched with the first quadrilateral, matching the another indoor unit with the first or second quadrilateral according to the detected temperature of the second temperature sensor, If any one indoor unit is matched with a second quadrilateral, an additional matching step of matching the another indoor unit with the first or second quadrilateral according to the sensed temperature of the first temperature sensor is performed. It may further include.

The first matching step may include: detecting a temperature by the first temperature sensor after a predetermined time elapses after the one indoor unit is turned on; And when the sensing temperature of the first temperature sensor is lower than a preset temperature, matching the indoor unit with the first four sides, and when the sensing temperature of the first temperature sensor is maintained above a predetermined temperature, The method may include matching one indoor unit with the second quadrilateral.

When the one indoor unit is matched with the first quadrilateral in the initial matching step, the matching step includes detecting the temperature by the second temperature sensor after a predetermined time elapses after the other indoor unit is turned on. process; And when the sensing temperature of the second temperature sensor is lower than a preset temperature, matching the other indoor unit with the second quadrilateral, and when the sensing temperature of the second temperature sensor is maintained above a preset temperature, The method may include matching one indoor unit with the first quadrilateral.

When the one indoor unit is matched with a second quadrilateral in the initial matching step, the matching step may be performed by detecting the temperature by the first temperature sensor after a predetermined time elapses after the other indoor unit is turned on. process; And when the sensing temperature of the first temperature sensor is lower than a preset temperature, matching the other indoor unit with the first quadrilateral, and when the sensing temperature of the first temperature sensor is maintained above a preset temperature, The method may include matching one indoor unit with the second quadrilateral.

On the other hand, the pipe search method of the air conditioning system according to another embodiment of the present invention, the plurality of first system indoor units to operate as a condenser and the plurality of second system indoor units to operate as an evaporator to operate all the indoor units. In this case, it is possible to determine whether the temperature of the indoor heat exchanger of each indoor unit rises or falls, and matches each indoor unit with any one of the first and second four sides.

In more detail, the pipe search method of the air conditioning system according to another embodiment of the present invention, the first four sides are controlled so that the refrigerant is condensed in the indoor heat exchanger of the indoor unit connected to the first four sides, the second A quadrilateral control step of controlling the second quadrilateral in the indoor heat exchanger of the indoor unit connected to the four sides; Operating the plurality of indoor units to turn on; And a matching step of matching an indoor unit having a temperature of an indoor heat exchanger matched with the first quadrilateral and matching an indoor unit having a temperature lowered of the indoor heat exchanger with the second quadrilateral.

According to a preferred embodiment of the present invention, since it is possible to simultaneously operate the cooling and heating using the first and second four sides instead of a separate distributor, there is an advantage that the price of the air conditioning system is lowered and the convenience of installation increases.

In addition, through the pipe search method, it is possible to quickly and accurately find out whether each of the plurality of indoor units is connected to the first or second quadrilateral.

1 is a block diagram of an air conditioning system according to an embodiment of the present invention.
2 is a view showing the flow of the refrigerant during the cooling chamber operation.
3 is a view showing the flow of the refrigerant during the heating the entire room operation.
4 is a view illustrating a flow of a refrigerant during simultaneous heating and cooling operation in which a first system indoor unit is heated and a second system indoor unit is cooled.
FIG. 5 is a view illustrating a flow of a refrigerant during the simultaneous heating and cooling operation in which the first system indoor unit is cooled and the second system indoor unit is heated.
6 is a control block diagram of an air conditioning system according to an embodiment of the present invention.
7 to 9 is a flow chart of the pipe search method of the air conditioning system according to an embodiment of the present invention.
10 is a flow chart of a pipe search method of an air conditioning system according to another embodiment of the present invention.
11 is a flowchart illustrating a method of determining whether an indoor unit is controllable according to an input air conditioning command.

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

1 is a block diagram of an air conditioning system according to an embodiment of the present invention.

An air conditioning system according to an embodiment of the present invention includes an outdoor unit 10, a plurality of first system indoor units 21 and 22 included in the first system 20A, and a second system 20B. It may include a plurality of second system indoor unit (23, 24) included.

The outdoor unit 10 may include a compressor 31, an outdoor heat exchanger 32, an outdoor expansion mechanism 33, a common four sides 40, and first and second four sides 41 and 42.

The compressor 31 may discharge the refrigerant sucked into the suction passage 72 to the discharge passage 71.

The suction passage 72 may include a suction pipe connected to the compressor 31 and an accumulator 38 installed in the suction pipe. The accumulator 38 may store the liquid refrigerant and allow only the refrigerant in the gaseous state to be sucked into the compressor 31.

The discharge flow path 71 may include a discharge pipe connected to the compressor 31 and an oil separator 39 installed in the discharge pipe. The oil separator 39 may separate the oil discharged together with the refrigerant from the compressor 31 and recover the oil discharged back to the compressor 31.

The common four sides 40 may selectively communicate the discharge passage 71 or the suction passage 72 with the outdoor heat exchanger 32.

More specifically, the common four sides 40 may be connected to the discharge side connection flow path 73, the suction side connection flow path 76, and the outdoor heat exchanger connection flow path 74. The discharge side connection passage 73 may connect the discharge passage 71 with the common four sides 40, and the suction side connection passage 76 may connect the suction passage 72 with the common four sides 40, and outdoors The heat exchanger connection passage 74 may connect the outdoor heat exchanger 32 with the common four sides 40. The common four sides 40 may selectively communicate the discharge side connection passage 73 or the suction side connection passage 76 with the outdoor heat exchanger connection passage 74. That is, the common four sides 40 may communicate one of the discharge side connection passage 73 and the suction side connection passage 76 with the outdoor heat exchanger connection passage 74, and close the other.

When the outdoor heat exchanger 32 is in communication with the discharge flow path 71, the refrigerant in the discharge flow path 71 may be condensed in the outdoor heat exchanger 32. On the contrary, when the outdoor heat exchanger 32 communicates with the suction passage 72, the refrigerant evaporated in the outdoor heat exchanger 32 may flow into the suction passage 72. That is, when the common four sides 40 communicate the outdoor heat exchanger 32 and the discharge passage 71, the outdoor heat exchanger 32 acts as a condenser, and the outdoor heat exchanger 32 and the suction passage 72 communicate with each other. The outdoor heat exchanger 32 can then act as an evaporator.

The outdoor heat exchanger 32 may be connected to the plurality of indoor units 21, 22, 23, 24 by the liquid flow path 75. In more detail, the plurality of indoor units 21, 22, 23, 24 may be connected to the liquid passage 75 by the plurality of liquid branch passages 95, 96, 97, 98, respectively. .

The subcooler (not shown) may be installed in the liquid passage 75.

The outdoor expansion mechanism 33 may be installed in the liquid passage 75. The outdoor expansion mechanism 33 may include an electronic expansion valve (EEV) in which the opening degree may be adjusted.

When the outdoor heat exchanger 32 acts as an evaporator, the outdoor expansion mechanism 33 can be controlled to a predetermined opening degree, the refrigerant can be expanded through the outdoor expansion mechanism 33, the outdoor heat exchanger 32 May be evaporated). On the contrary, when the outdoor heat exchanger 32 acts as a condenser, the outdoor expansion mechanism 33 can be controlled to the maximum opening degree, and the refrigerant condensed in the outdoor heat exchanger 32 expands while passing through the outdoor expansion mechanism 33. It may not be.

The outdoor fan 32A may be disposed to face the outdoor heat exchanger 32, and the air flowed by the outdoor fan 32A may exchange heat with the refrigerant passing through the outdoor heat exchanger 32.

On the other hand, the plurality of indoor units 21, 22, 23, 24 are made of the first system indoor unit 21 (22) and the second system 20B included in the first system (20A) It can be divided into two system units (23, 24). The first system indoor units 21 and 22 may communicate with the first four sides 41, and the second system indoor units 22 and 23 may communicate with the second four sides 42.

The plurality of first system indoor units 21 and 22 may be connected in parallel to the first four sides 41 to selectively communicate with the discharge passage 71 or the suction passage 72, and the plurality of second systems The indoor units 23 and 24 may be connected to the second four sides 42 in parallel to selectively communicate with the discharge passage 71 or the suction passage 72.

The first and second four sides 41 and 42 may be connected to the discharge passage 71 and the suction passage 72 in parallel. That is, the refrigerant in the discharge passage 71 is divided into the first four sides 41 and the second four sides 42, or the refrigerant passing through the first four sides 41 and the second four sides 42 is introduced. May be combined to flow into the suction flow path 72.

In more detail, the first discharge side connecting passage 83, the first suction side connecting passage 85, and the first gas passage 87 are connected to the first four sides 41 and the second four sides 42. The second discharge side connecting passage 84, the second suction side connecting passage 86, and the second gas passage 88 may be connected.

The first discharge side connection passage 83 and the second discharge side connection passage 84 may be connected to the discharge passage 71 by the discharge side common passage 81. The first suction side connection passage 85 and the second suction side connection passage 86 may be connected to the suction passage 72 by the suction side common passage 82.

The first gas passage 87 may be connected to the plurality of first system indoor units 21 and 22 by the plurality of first gas branch passages 91 and 92, respectively, and the second gas passage 88 may be connected to the first gas passage 87. The plurality of second gas branch passages 93 and 94 may be connected to the plurality of second system indoor units 23 and 24, respectively.

The first four-sided 41 may selectively communicate the plurality of first system indoor units 21 and 22 with the discharge passage 71 or the suction passage 72. More specifically, the first four-sided 41 may selectively communicate the first gas passage 87 with the first discharge side connection passage 83 or the first suction side connection passage 85. That is, the first four-sided 41 may communicate any one of the first discharge side connecting passage 83 and the first suction side connecting passage 85 with the first gas passage 87 and close the other. .

In addition, the second four sides 42 may selectively communicate the plurality of second system indoor units 23 and 24 with the discharge passage 71 or the suction passage 72. In more detail, the second four-sided 42 may selectively communicate the second gas passage 88 with the second discharge side connection passage 84 or the second suction side connection passage 86. That is, the second four-sided 42 may communicate any one of the second discharge side connecting passage 84 and the second suction side connecting passage 86 with the second gas passage 88 and close the other.

Each indoor unit 21, 22, 23, 24 includes an indoor heat exchanger 25, 26, 27, 28 and an indoor expansion mechanism 34, 35, 36, 37. Can be.

The indoor heat exchanger 25, 26 included in the first system indoor unit 21, 22 may be referred to as a first system indoor heat exchanger, and the room included in the second system indoor units 23, 24. The heat exchangers 27 and 28 may be referred to as second system indoor heat exchangers. In addition, the indoor expansion mechanisms 34 and 35 included in the first system indoor units 21 and 22 may be referred to as a first system indoor expansion mechanism, and may be referred to as the second system indoor units 23 and 24. The included indoor expansion mechanisms 36 and 37 may be referred to as a second system indoor expansion mechanism.

The indoor heat exchangers 25 and 26 of the first system indoor units 21 and 22 may have one side connected to the first gas branch passages 91 and 92, and the other side thereof to the liquid branch passages 95 and 96. ) Can be connected. The indoor heat exchangers 27 and 28 of the second system indoor units 23 and 34 may have one side connected to the second gas branch passages 93 and 94 and the other side to the liquid branch passages 97 and 98. ) Can be connected.

Each indoor unit 21, 22, 23, 24 may be operated in a cooling mode or a heating mode. The plurality of indoor units included in different systems may be operated in the same mode or in different modes. On the other hand, a plurality of indoor units included in the same system may be operated in the same mode, and may not be operated in different modes. For example, when the first system indoor units 21 and 22 are operated in a heating mode, the second system indoor units 23 and 24 may be operated in a cooling mode. However, when any one first system indoor unit 21 is operated in a heating mode, the other first system indoor unit 22 may not be operated in a cooling mode.

When the first system indoor units 21 and 22 are operated in the heating mode, the first four sides 41 may be in communication with the discharge passage 71, and the first system indoor units 21 and 22 may be in communication with each other. The indoor heat exchanger (25) 26 acts as a condenser such that refrigerant may be condensed in the indoor heat exchanger (25) (26).

When the first system indoor units 21 and 22 are operated in the cooling mode, the first four sides 41 may be in communication with the suction passage 72, and the first system indoor units 21 and 22 may be in communication with each other. The indoor heat exchanger (25) 26 acts as an evaporator so that refrigerant may evaporate in the indoor heat exchanger (25) 26.

When the second system indoor units 23 and 24 are operated in the heating mode, the second four sides 42 may be in communication with the discharge passage 71, and the second system indoor units 23 and 24 may be connected to each other. The indoor heat exchangers 27 and 28 act as condensers such that refrigerant may condense in the indoor heat exchangers 27 and 28.

When the second system indoor units 23 and 24 are operated in the cooling mode, the second four sides 42 may be in communication with the suction passage 72, and the second system indoor units 23 and 24 may be connected to each other. The indoor heat exchangers 27 and 28 act as evaporators so that refrigerant may evaporate in the indoor heat exchangers 27 and 28.

A plurality of indoor expansion mechanisms 34, 35, 36, 37 may be installed in the plurality of liquid branch passages 95, 96, 97, 98, respectively. Each indoor expansion mechanism 34, 35, 36, 37 may include an electronic expansion valve (EEV) in which the opening degree can be adjusted.

When the indoor heat exchangers 25 and 26 of the first system indoor units 21 and 22 act as evaporators, the indoor expansion mechanisms 34 and 35 of the first system indoor units 21 and 22 It may be controlled to a predetermined opening degree, the refrigerant may be expanded through the indoor expansion mechanism (34) 35, and may be evaporated in the indoor heat exchanger (25) (26). On the contrary, when the indoor heat exchangers 25 and 26 of the first system indoor units 21 and 22 act as condensers, the indoor expansion mechanisms 34 and 35 of the first system indoor units 21 and 22 function. May be controlled to the maximum opening degree, and the refrigerant condensed in the indoor heat exchanger (25) 26 may pass through the indoor expansion mechanism (34) 35 and may not be expanded.

When the indoor heat exchangers 27 and 28 of the second system indoor units 23 and 24 act as evaporators, the indoor expansion mechanisms 36 and 37 of the second system indoor units 23 and 24 It can be controlled to a predetermined opening degree, the refrigerant can be expanded through the indoor expansion mechanism (36) 37, and can be evaporated in the indoor heat exchanger (27) (28). On the contrary, when the indoor heat exchangers 27 and 28 of the second system indoor units 23 and 24 act as condensers, the indoor expansion mechanisms 36 and 37 of the second system indoor units 23 and 24 function as condensers. May be controlled to the maximum opening degree, and the refrigerant condensed in the indoor heat exchanger (27) 28 may not be expanded while passing through the indoor expansion mechanism (36) 37.

Each indoor unit 21, 22, 23, 24 may be provided with an indoor fan (not shown), which faces the indoor heat exchanger 25, 26, 27, 28. The air flowing by the indoor fan may exchange heat with the refrigerant passing through the indoor heat exchangers 25, 26, 27, 28.

On the other hand, the air conditioning system according to an embodiment of the present invention, the first temperature sensor 51 provided in the first suction side connection flow path 85 and the second temperature provided in the second suction side connection flow path 86. The sensor 52 may further include.

The first temperature sensor 51 may sense the temperature of the refrigerant flowing through the first four-sided 41 to the suction channel 72, and the second temperature sensor 52 may have the second four-sided 42. The temperature of the refrigerant flowing through the suction passage 72 may be sensed.

In addition, the air conditioning system according to an embodiment of the present invention includes a plurality of liquid temperature sensors 61A, 62A, 63A, respectively provided in the plurality of liquid branch passages 95, 96, 97, 98 ( 64A and a plurality of gas temperature sensors 61B, 62B, 63B and 64B respectively provided in the plurality of gas branch passages 91, 92, 93 and 94.

The plurality of liquid temperature sensors 61A, 62A, 63A, 64A and the plurality of gas temperature sensors 61B, 62B, 63B, 64B are each indoor heat exchangers 25, 26, 27 ( It may mean the entrance and exit temperature sensor of 28).

A plurality of indoor heat exchangers 25, 26 in addition to or in place of the plurality of liquid temperature sensors 61A, 62A, 63A, 64A and the plurality of gas temperature sensors 61B, 62B, 63B, 64B. Of course, the indoor heat exchanger temperature sensor (not shown) may be provided in each of the 27 and 28.

2 is a view showing the flow of the refrigerant during the cooling chamber operation.

During the cooling room operation, the plurality of first system indoor units 21 and 22 and the plurality of second system indoor units 23 and 24 may be operated in a cooling mode.

During the cooling chamber operation, the common four sides 40 communicate the outdoor heat exchanger 32 with the discharge passage 71, and the first four sides 41 connect the plurality of first system indoor units 21 and 22. The second channel 42 may communicate with the suction channel 72, and the second quadrangle 42 may communicate with the suction channel 72.

In more detail, the common four sides 40 may communicate the discharge side connection flow path 73 with the outdoor heat exchanger connection flow path 74 and close the suction side connection flow path 76. The first four-sided 41 may communicate the first suction side connection passage 85 with the first gas passage 87 and close the first discharge side connection passage 83. The second four-side 42 may communicate the second suction side connection passage 86 with the second gas passage 88 and close the second discharge side connection passage 84.

In addition, the outdoor expansion mechanism 33 may be controlled at the maximum opening degree and the plurality of indoor expansion mechanisms 34, 35, 36, 37 may be controlled at a predetermined expansion opening degree during the cooling room operation.

Hereinafter, a description will be given along the flow of the refrigerant during the cooling chamber operation.

The high temperature and high pressure gaseous refrigerant compressed by the compressor 31 and discharged into the discharge passage 71 may flow through the first four sides 40 and the connection of the outdoor heat exchanger 74 to the outdoor heat exchanger 32. have. The refrigerant passes through the outdoor heat exchanger 32 and may be condensed in a liquid state by heat exchange with air blown by the outdoor fan 32A.

The refrigerant condensed in the outdoor heat exchanger 32 and flowed into the connection passage 75 may be divided into a plurality of liquid branch passages 95, 96, 97, and 98. Refrigerant flowed into each of the liquid branch passages 95, 96, 97, 98 may be expanded through each of the indoor expansion mechanisms 34, 35, 36, 37. The refrigerant expanded in the indoor expansion mechanisms 34, 35, 36, 37 may be phase-changed into a two-phase state in which the liquid and gas states coexist.

Refrigerant expanded in each indoor expansion mechanism (34) (35) (36) (37) passes through each indoor heat exchanger (25) (26) (27) (28) and is blown by an indoor fan (not shown). Heat exchange with air can be evaporated to a gaseous state. The air cooled by heat exchange with the refrigerant may be discharged into the room to cool the room.

The refrigerant evaporated in the plurality of first system indoor heat exchangers 25 and 26 and flowed into the gas branch passages 91 and 92 may be combined and flow into the first gas flow passage 87. The refrigerant evaporated in the indoor heat exchangers 27 and 28 and flowed into the gas branch passages 93 and 94 may be combined and flow into the second gas passage 88.

The refrigerant flowing into the first gas passage 87 may pass through the first four-sided 41 and flow into the first suction side connection passage 85, and the refrigerant flowing into the second gas passage 88 may include the first refrigerant. The two suction sides 42 may flow to the second suction side connection flow path 86. The refrigerant flowing into the first suction side connection passageway 85 and the refrigerant flowing into the second suction side connection passageway 86 may be combined to flow to the suction side common passageway 82, and may pass through the suction passage 72. May be sucked into the compressor 31. Thereafter, the compressor 31 may discharge the refrigerant to the discharge passage 71 again, repeat the above-described process and circulate the cooling cycle.

3 is a view showing the flow of the refrigerant during the heating the entire room operation.

In the heating all rooms, the plurality of first system indoor units 21 and 22 and the plurality of second system indoor units 23 and 24 may be operated in a heating mode.

When the heating room is in operation, the common four sides 40 communicates the outdoor heat exchanger 32 with the suction channel 72, and the first four sides 41 connect the plurality of first system indoor units 21 and 22. The second flow path 42 may communicate with the discharge flow path 71, and the plurality of second system indoor units 23 and 24 may communicate with the discharge flow path 71.

More specifically, the common four sides 40 may communicate the suction side connection passage 76 with the outdoor heat exchanger connection passage 74 and close the discharge side connection passage 73. The first four-sided 41 may communicate the first discharge side connection passage 83 with the first gas passage 87 and close the first suction side connection passage 85. The second four-side 42 may communicate the second discharge side connection passage 84 with the second gas passage 88 and close the second suction side connection passage 86.

In addition, the outdoor expansion mechanism 33 may be controlled at a predetermined expansion opening degree and the plurality of indoor expansion mechanisms 34, 35, 36, 37 may be controlled at a maximum opening degree when the heating room is operated.

Hereinafter, a description will be given along the flow of the refrigerant during the heating of the entire room operation.

The high-temperature, high-pressure gas phase refrigerant compressed by the compressor 31 and discharged into the discharge passage 71 passes through the discharge side common passage 81 and is divided into a first discharge side connection passage 83 and a second discharge side connection passage 84 to flow. Can be.

The refrigerant flowing into the first discharge-side connecting passage 83 may be divided into a plurality of gas branch passages 91 and 92 through the first four sides 41 and the first gas passage 87, and may flow. To the first system outdoor heat exchanger (25) (26).

The refrigerant flowing into the second discharge-side connecting passage 84 may be divided into a plurality of gas branch passages 93 and 94 through the second four-side 42 and the second gas passage 88, and may flow. To the second system outdoor heat exchanger (27) (28).

Refrigerant flowed into each indoor heat exchanger 25, 26, 27, 28 passes through the indoor heat exchanger 25, 26, 27, 28 and is blown by an indoor fan (not shown). Can be condensed into a liquid state by heat exchange with. Air heated by heat exchange with the refrigerant may be discharged into the room to heat the room.

The refrigerant condensed in each indoor heat exchanger 25, 26, 27, 28 and flowed into each liquid branch passage 95, 96, 97, 98 can be combined and flowed into the liquid flow path 75. have. The refrigerant flowing into the liquid passage 75 may expand while passing through the outdoor expansion mechanism 33. The refrigerant expanded in the outdoor expansion mechanism 33 may be phase-changed into a two-phase state in which a liquid and a gas state coexist.

The refrigerant expanded in the outdoor expansion mechanism 33 passes through each outdoor heat exchanger 32 and heat exchanges with the air blown by the outdoor fan 32A to be evaporated in a gaseous state.

The refrigerant evaporated from the outdoor heat exchanger 32 and flowed into the outdoor heat exchanger connection flow path 74 may flow through the common four sides 40 and the suction side connection flow path 76 and flow into the suction flow path 72. 31 can be inhaled. Thereafter, the compressor 31 may discharge the refrigerant to the discharge passage 71 again, repeat the above-described process and circulate the cooling cycle.

4 is a view illustrating a flow of a refrigerant during simultaneous heating and cooling operation in which the first system indoor unit is heated and the second system indoor unit is cooled.

In the simultaneous heating and cooling operation, the plurality of first system indoor units 21 and 22 may be heated and the plurality of second system indoor units 23 and 24 may be operated in a cooling mode.

In the simultaneous heating and cooling operation in which the heating is performed in the plurality of first system indoor units 21 and 22 and the cooling is performed in the plurality of second system indoor units 23 and 24, the common four sides 40 performs outdoor heat exchange. The group 32 communicates with the suction channel 72, and the first four-sided side 41 communicates the plurality of first system indoor units 21 and 22 with the discharge channel 71. 42 may communicate the plurality of second system indoor units 23 and 24 with the suction flow path 72.

More specifically, the common four sides 40 may communicate the suction side connection passage 76 with the outdoor heat exchanger connection passage 74 and close the discharge side connection passage 73. The first four-sided 41 may communicate the first discharge side connection passage 83 with the first gas passage 87 and close the first suction side connection passage 85. The second four-side 42 may communicate the second suction side connection passage 86 with the second gas passage 88 and close the second discharge side connection passage 84.

In addition, the outdoor expansion mechanism 33 and the second system outdoor expansion mechanisms 36 and 37 may be controlled by a predetermined expansion opening degree, and the first system outdoor expansion mechanisms 34 and 35 may be controlled by a maximum opening degree. .

Hereinafter, a description will be given along the flow of the refrigerant during the simultaneous heating and cooling operation in which the heating is performed in the plurality of first system indoor units 21 and 22 and the cooling is performed in the plurality of second system indoor units 23 and 24.

The high-temperature, high-pressure gas phase refrigerant compressed by the compressor 31 and discharged to the discharge passage 71 sequentially passes through the discharge side common passage 81, the first discharge side connection passage 83, and the first four sides 41. It can flow to one gas flow path (87). The refrigerant flowing into the first gas passage 87 may be divided into a plurality of gas branch passages 91 and 92, and may be respectively flowed into the plurality of first system outdoor heat exchangers 25 and 26. .

The refrigerant flowing into each of the first system indoor heat exchangers 25 and 26 passes through the indoor heat exchangers 25 and 26 and may be condensed in a liquid state by heat exchange with air blown by an indoor fan (not shown). have. The air heated by the heat exchange with the refrigerant may be discharged into the room to heat the room in which the first system indoor units 21 and 22 are disposed.

The refrigerant condensed in the first system indoor heat exchanger (25) 26 and flowed into each liquid branch passage (95) (96) may be combined to flow into the liquid passage (75). Some of the refrigerant flowing into the liquid passage 75 may flow to the outdoor unit 10 side along the liquid passage 75, and another portion may flow to the second system indoor unit 23 and 24 side.

The refrigerant flowing into the second system indoor units 23 and 24 may be divided into a plurality of liquid branch flow paths 97 and 98 respectively connected to the plurality of second system indoor heat exchangers 27 and 28. It may be expanded through the second system indoor expansion mechanism (36, 37). The refrigerant expanded in the second system indoor expansion mechanisms 36 and 37 may be phase-changed into a two-phase state in which a liquid and a gas state coexist. The refrigerant expanded in the second system indoor expansion mechanisms 36 and 37 passes through the second system indoor heat exchangers 27 and 28 and exchanges heat with air blown by an indoor fan (not shown) to evaporate to a gas state. Can be. The air cooled by the heat exchange with the refrigerant may be discharged into the room to cool the room in which the second system indoor units 23 and 24 are disposed.

The refrigerant evaporated in each of the second system indoor heat exchangers 27 and 28 and flowed into the gas branch passages 93 and 94 may be combined and flow into the second gas passage 88, and the second four sides 42 may be used. ), The second suction side connection passage 86 and the suction side common passage 82 may be sequentially flowed to the suction passage 72.

Meanwhile, the refrigerant flowing from the liquid flow path 75 toward the outdoor unit 10 may expand while passing through the outdoor expansion mechanism 33. The refrigerant expanded in the outdoor expansion mechanism 33 may be phase-changed into a two-phase state in which a liquid and a gas state coexist. The refrigerant expanded in the outdoor expansion mechanism 33 passes through the outdoor heat exchanger 32 and may exchange heat with the air blown by the outdoor fan 32A to evaporate to a gas state.

The refrigerant evaporated from the outdoor heat exchanger 32 and flowed into the outdoor heat exchanger connection flow path 74 may pass through the common four sides 40 and the suction side connection flow path 76 in order to flow into the suction flow path 72. have.

The refrigerant flowing into the suction passage 72 through the suction side common passage 82 and the refrigerant flowing into the suction passage 72 through the suction side connection passage 76 may be combined and sucked into the compressor 31. Thereafter, the compressor 31 may discharge the refrigerant to the discharge passage 71 again, repeat the above-described process and circulate the cooling cycle.

FIG. 5 is a view illustrating a flow of a refrigerant during the simultaneous heating and cooling operation in which the first system indoor unit is cooled and the second system indoor unit is heated.

In the simultaneous heating and cooling operation, the plurality of first system indoor units 21 and 22 may be cooled and the plurality of second system indoor units 23 and 24 may be operated in a heating mode.

In the simultaneous heating and cooling operation in which the cooling is performed in the plurality of first system indoor units 21 and 22 and the heating is performed in the plurality of second system indoor units 23 and 24, the common four sides 40 performs outdoor heat exchange. Group 32 is in communication with the suction flow path 72, the first four sides 41 communicates a plurality of first system indoor units (21, 22) with the suction flow path 72, the second four sides ( 42 may communicate the plurality of second system indoor units 23 and 24 with the discharge flow path 71.

More specifically, the common four sides 40 may communicate the suction side connection passage 76 with the outdoor heat exchanger connection passage 74 and close the discharge side connection passage 73. The first four-sided 41 may communicate the first suction side connection passage 85 with the first gas passage 87 and close the first discharge side connection passage 83. The second four-sided 42 may communicate the second discharge side connection passage 84 with the second gas passage 88 and close the second suction side connection passage 86.

In addition, the outdoor expansion mechanism 33 and the first system outdoor expansion mechanisms 34 and 35 may be controlled by a predetermined expansion opening degree, and the second system outdoor expansion mechanisms 36 and 37 may be controlled by a maximum opening degree. .

Hereinafter, a cooling and cooling operation in which cooling is performed in the plurality of first system indoor units 21 and 22 and heating is performed in the plurality of second system indoor units 23 and 24 will be described according to the flow of the refrigerant.

The high-temperature, high-pressure gas phase refrigerant compressed by the compressor 31 and discharged into the discharge passage 71 passes sequentially through the discharge side common passage 81, the second discharge side connection passage 84, and the second four-sided 42. It may flow into the two gas flow path (88). The refrigerant flowing into the second gas passage 88 may be divided into a plurality of gas branch passages 93 and 94, and may be respectively flowed into the plurality of second system outdoor heat exchangers 27 and 28. .

The refrigerant flowing into each of the second system indoor heat exchangers 27 and 28 passes through the indoor heat exchangers 27 and 28 and may be condensed in a liquid state by heat exchange with air blown by an indoor fan (not shown). have. The air heated by the heat exchange with the refrigerant may be discharged into the room to heat the room in which the second system indoor units 23 and 24 are disposed.

The refrigerant condensed in the second system indoor heat exchanger 27 and 28 and flowed into each of the liquid branch flow paths 97 and 98 may be combined and flow into the liquid flow path 75. Some of the refrigerant flowing into the liquid passage 75 may flow toward the outdoor unit 10 along the liquid passage 75, and another portion may flow toward the first system indoor units 21 and 22.

The refrigerant flowing to the first system indoor units 21 and 22 may be divided into a plurality of liquid branch flow paths 95 and 96 respectively connected to the plurality of first system indoor heat exchangers 25 and 26. It may be expanded while passing through the first system indoor expansion mechanism (34, 35). The refrigerant expanded in the first system indoor expansion mechanisms 34 and 35 may be phase-changed into a two-phase state in which a liquid and a gas state coexist. The refrigerant expanded in the first system indoor expansion mechanisms 34 and 35 passes through the first system indoor heat exchangers 25 and 26 and exchanges heat with air blown by an indoor fan (not shown) to evaporate to a gas state. Can be. The air cooled by the heat exchange with the refrigerant may be discharged into the room to cool the room in which the first system indoor units 21 and 22 are disposed.

The refrigerant evaporated in each of the first system indoor heat exchangers 25 and 26 and flowed into the gas branch passages 91 and 92 may be combined and flow into the first gas passage 87, and the first four sides 41 may be combined. ), The first suction side connection flow path 85 and the suction side common flow path 82 may be sequentially flowed to the suction flow path 72.

Meanwhile, the refrigerant flowing from the liquid flow path 75 toward the outdoor unit 10 may expand while passing through the outdoor expansion mechanism 33. The refrigerant expanded in the outdoor expansion mechanism 33 may be phase-changed into a two-phase state in which a liquid and a gas state coexist. The refrigerant expanded in the outdoor expansion mechanism 33 passes through the outdoor heat exchanger 32 and may exchange heat with the air blown by the outdoor fan 32A to evaporate to a gas state.

The refrigerant evaporated from the outdoor heat exchanger 32 and flowed into the outdoor heat exchanger connection flow path 74 may pass through the common four sides 40 and the suction side connection flow path 76 in order to flow into the suction flow path 72. have.

The refrigerant flowing into the suction passage 72 through the suction side common passage 82 and the refrigerant flowing into the suction passage 72 through the suction side connection passage 76 may be combined and sucked into the compressor 31. Thereafter, the compressor 31 may discharge the refrigerant to the discharge passage 71 again, repeat the above-described process and circulate the cooling cycle.

6 is a control block diagram of an air conditioning system according to an embodiment of the present invention.

The air conditioning system according to an embodiment of the present invention may further include a controller 100, an input unit 101, an output unit 102, and a storage unit 103.

The controller 100 may be disposed in at least one of the outdoor unit 10 and the plurality of indoor units 21, 22, 23, 24. In addition, the controller 100 may be disposed in a building in which an air conditioning system is installed.

The controller 100 may control overall operation of the air conditioning system. The controller 100 includes the first temperature sensor 51, the second temperature sensor 52, the gas temperature sensors 61B, 62B, 63B, 64B, and the liquid temperature sensors 61A, 62A, 63A described above. 64A may receive the temperature information measured, and control the common quadrilateral 40, the first quadrilateral 41, and the second quadrilateral 42 described above. The controller 100 may also control the outdoor expansion device 33, the indoor expansion devices 34, 35, 36, 37, the outdoor fan 32A, and the indoor fan (not shown) described above. .

The input unit 101 is configured to receive a user's command, but is preferably provided in each of the plurality of indoor units 21, 22, 23, 24, but is not limited thereto. The type of the input unit 101 is not limited, and for example, may be configured as a switch, a remote controller, or the like. The controller 100 may receive a command input to the input unit 101.

The output unit 102 is configured to output information related to the operation of the air conditioning system, and is preferably provided in each of the plurality of indoor units 21, 22, 23, 24, but is not limited thereto. The type of the output unit 102 is not limited, and may be configured as, for example, a display or a speaker. The controller 100 may output information to the output unit 102.

The storage unit 103 is configured to store information related to the operation of the air conditioning system, and the controller 100 may store information in the storage unit 103 or bring information stored in the storage unit 103.

7 to 9 is a flow chart of the pipe search method of the air conditioning system according to an embodiment of the present invention.

Air conditioning system according to an embodiment of the present invention can perform a pipe search. Piping search means to search for which of the first system 20A and the second system 20B belong to each indoor unit 21, 22, 23, 24 at the time of installation and setting of the air conditioning system. Can mean. That is, during the pipe search, each indoor unit 21, 22, 23, 24 may be matched with any one of the first four sides 41 and the second four sides 42.

When a pipe search start command of an operator is input to the input unit 101, the controller 100 may start pipe search.

Pipe search method according to the present embodiment, the first operation step (S11) for turning on any one of the indoor unit 21 of the plurality of indoor units (21) (22) (23) (24); Initial matching step (S12) (S13) (S14) of matching any one indoor unit (21) with the first quadrilateral (41) or the second quadrilateral (42) according to the detected temperature of the first temperature sensor (51). ); An operation step (S21) (S31) of turning on the other indoor unit (22) of the plurality of indoor units (21) (22) (23) (24); And when one indoor unit 21 is matched with the first four-sided 41, the other indoor unit 22 may be replaced by the first four-sided 41 according to the detected temperature of the second temperature sensor 52. Alternatively, when one of the indoor units 21 is matched with the second quadrilateral 42 (S22), S23 (S24), and the second quadrilateral 42, the first temperature sensor 51 It may include a matching step of matching the other indoor unit 22 with the first four sides 41 or the second four sides 42 according to the sensing temperature (S32) (S33) (S34).

The first matching step (S12) (S13) (S14), the process of sensing the temperature in the first temperature sensor 51 after a predetermined time elapses after any one indoor unit 21 is turned on; And when the detected temperature of the first temperature sensor 51 is lower than the preset temperature, any one indoor unit 21 is matched with the first four-sided 41 (S12) (S13), and the first temperature sensor 51 If the sensing temperature of the) is maintained above the predetermined temperature may include the step (S12) (S14) of matching any one indoor unit 21 with the second quadrilateral (42).

When one indoor unit 21 is matched with the first quadrilateral 41 in the initial matching step (S12) (S13), in the matching step, the other indoor unit 22 is turned on and a predetermined time elapses. After detecting the temperature in the second temperature sensor 52; And when the sensing temperature of the second temperature sensor 52 is lower than the preset temperature, the other indoor unit 22 is matched with the second quadrilateral 42 (S22) (S23), and the second temperature sensor 52. If the sensing temperature of the) is maintained above the predetermined temperature may include the process of matching the other indoor unit 22 with the first four sides 41 (S22) (S24).

When one indoor unit 21 is matched with the second quadrilateral 42 in the initial matching step (S12) (S14), the matching step is that the other indoor unit 22 is turned on and a predetermined time elapses. After the process of sensing the temperature in the first temperature sensor 51; And when the detected temperature of the first temperature sensor 52 is lower than the preset temperature, the other indoor unit 22 is matched with the first four-sided 41 (S32) (S33), and the first temperature sensor 51 If the sensing temperature of the ()) is maintained above the predetermined temperature may include the step (S32) (S34) of matching the other indoor unit 22 with the second quadrilateral (42).

Pipe search method according to the present embodiment, the off step (S25) (S35) for turning off the other indoor unit 22; An additional operation step (S27) (S21) (S37) (S31) of turning on another indoor unit (23) of the plurality of indoor units; And when any one indoor unit 21 is matched with the first four-sided 41, another one indoor unit 23 according to the detected temperature of the second temperature sensor 52, the first four-sided 41 ) Or the second four-sided (42) (S27) (S22) (S23) (S24), when any one of the indoor unit 21 is matched with the second four-sided (42) first temperature sensor Further matching (S37) (S32) (S33) (S34) to match another indoor unit 23 with the first quadrilateral 41 or the second quadrilateral 42 according to the sensed temperature of 51. It may further comprise a step.

Hereinafter, a pipe search method according to the present embodiment will be described in more detail.

In the pipe searching method according to the present embodiment, the common four sides 40, the first four sides 41, and the second four sides 42 are controlled in the same manner as in the case of operating the entire room cooling mode (see FIG. 2). Can be implemented. In this case, the common four sides 40, the first four sides 41 and the second four sides 42 may be defined as all off (off) state.

The controller 100 may turn on any one indoor unit among a plurality (N, for example, N = 4) indoor units 21, 22, 23, and 24 (S11). Any one indoor unit may be referred to as a first indoor unit. In this case, the refrigerant circulating in the cooling cycle may be condensed in the outdoor heat exchanger 32 and evaporated in the first indoor unit.

After a predetermined time elapses after the first indoor unit is turned on, the temperature detected by the first temperature sensor 51 may be transmitted to the controller 100. When the detected temperature transmitted from the first temperature sensor 51 is lower than the preset temperature, the controller 100 matches the first indoor unit with the first quadrangle 41 (S12) (S13) and the first temperature. When the sensing temperature transmitted from the sensor is maintained above the preset temperature, the first indoor unit may be matched with the second quadrilateral 42 (S12) (S14).

For example, when the first indoor unit is included in the first system 20A, the refrigerant evaporated from the first indoor unit may pass through the first four sides 41. Therefore, the temperature sensed by the first temperature sensor 51 may be lowered by the cold refrigerant, whereby the first indoor unit may be matched with the first four sides 41.

On the other hand, when the first indoor unit is included in the second system 20B, the refrigerant evaporated from the first indoor unit may pass through the second four-sided 42 and the first four-sided 41 may not pass. have. Therefore, the temperature sensed by the first temperature sensor 51 can be maintained relatively high, whereby the first indoor unit can be matched with the second quadrilateral 42.

The controller 100 may store information about whether the first indoor unit is matched to either the first four sides 41 or the second four sides 42 in the storage unit 103.

When the first indoor unit is matched with the first four-sided 41, since the sensing temperature of the first temperature sensor 51 is already lowered, the search of the remaining indoor units is based on the sensing temperature of the first temperature sensor 51. It may not be judged accordingly. Therefore, when the first indoor unit is matched with the first four-sided 41, the search of the remaining indoor unit may be determined according to the detected temperature of the second temperature sensor 52 (S20).

On the other hand, when the first indoor unit is matched with the second four-sided 42, since the sensing temperature of the second temperature sensor 52 is already lowered, the search for the remaining indoor units is detected by the second temperature sensor 52. It may not be judged depending on the temperature. Therefore, when the first indoor unit is matched with the second four-sided 42, the search of the remaining indoor unit may be determined according to the detected temperature of the first temperature sensor 51 (S30).

The controller 100 sequentially rotates the first indoor unit of the plurality of indoor units 21, 22, 23, and 24 except for the first indoor unit among the plurality of N units, for example, N = 4. (41) or the second quadrilateral (42) can be matched. At this time, each indoor unit may be referred to as a K-th indoor unit according to the matching order of the plurality of indoor units. That is, the controller 100 may sequentially match the second indoor unit, the third indoor unit to the Nth indoor unit, with the first four sides 41 or the second four sides 42.

When the first indoor unit is matched with the first four sides 41 (S20), the controller 100 may turn on the K-th indoor unit (S21). Since the first indoor unit is kept in an on state, the refrigerant circulating in the cooling cycle may be condensed in the outdoor heat exchanger 32 and evaporated in the first indoor unit and the Kth indoor unit.

After the predetermined time elapses after the K-th indoor unit is turned on, the temperature detected by the second temperature sensor 52 may be transmitted to the controller 100. When the detected temperature transmitted from the second temperature sensor 52 is lower than the preset temperature, the controller 100 matches the K-th indoor unit with the second quadrilateral 42 (S22) (S23) and the second temperature. When the sensing temperature transmitted from the sensor 52 is maintained above the preset temperature, the K-th indoor unit may be matched with the first quadrilateral 41 (S22) (S24).

For example, when the K-th indoor unit is included in the first system 20A, the refrigerant evaporated from the K-th indoor unit passes through the first four-sided 41 and the second four-sided 42 passes. You can't. Therefore, the temperature detected by the second temperature sensor 52 can be maintained relatively high, whereby the K-th indoor unit can be matched with the first four-sided 41.

On the other hand, when the K-th indoor unit is included in the second system 20B, the refrigerant evaporated from the K-th indoor unit may pass through the second four sides 42. Therefore, the temperature sensed by the second temperature sensor 52 may be lowered by the cold refrigerant, whereby the K-th indoor unit may be matched with the second quadrilateral 42.

The controller 100 may store information regarding whether the K-th indoor unit is matched to either the first four sides 41 or the second four sides 42 in the storage unit 103.

Thereafter, the controller 100 may turn off the K-th indoor unit (S25) and determine whether K is equal to N (S26). If K is smaller than N, it means that not all indoor units have yet been matched, so that K increases by 1 (S27) so that the next indoor unit can be matched with either the first quadrilateral 41 or the second quadrilateral 42. Can be. If K is equal to N, it means that matching of all indoor units is completed, so that the pipe search can be ended.

On the other hand, when the first indoor unit is matched with the second quadrilateral 42 (S30), the controller 100 can turn on the K-th indoor unit (S31). Since the first indoor unit is kept in an on state, the refrigerant circulating in the cooling cycle may be condensed in the outdoor heat exchanger 32 and evaporated in the first indoor unit and the Kth indoor unit.

After a predetermined time elapses after the K-th indoor unit is turned on, the temperature detected by the first temperature sensor 51 may be transmitted to the controller 100. When the detected temperature transmitted from the first temperature sensor 51 is lower than the preset temperature, the controller 100 matches the K-th indoor unit with the first four-sided 41 (S32) (S33) and the first temperature. When the sensing temperature transmitted from the sensor 51 is maintained above the preset temperature, the K-th indoor unit may be matched with the second quadrilateral 42 (S32) (S34).

For example, when the K-th indoor unit is included in the first system 20A, the refrigerant evaporated from the K-th indoor unit may pass through the first four sides 41. Therefore, the temperature detected by the first temperature sensor 51 may be lowered by the cold refrigerant, whereby the K-th indoor unit may be matched with the first four-sided 41.

On the other hand, if the K-th indoor unit is included in the second system 20B, the refrigerant evaporated from the K-th indoor unit may pass through the second four-sided 42 and may not pass through the first four-sided 41. have. Therefore, the temperature detected by the first temperature sensor 51 can be maintained relatively high, whereby the K-th indoor unit can be matched with the second quadrilateral 42.

The controller 100 may store information regarding whether the K-th indoor unit is matched to either the first four sides 41 or the second four sides 42 in the storage unit 103.

Thereafter, the controller 100 may turn off the K-th indoor unit (S35) and determine whether K is equal to N (S36). If K is smaller than N, it means that not all indoor units have yet been matched, so that K increases by 1 (S37) so that the next indoor unit can be matched with either the first quadrilateral 41 or the second quadrilateral 42. Can be. If K is equal to N, it means that matching of all indoor units is completed, so that the pipe search can be ended.

10 is a flow chart of a pipe search method of an air conditioning system according to another embodiment of the present invention.

When a pipe search start command of an operator is input to the input unit 101, the controller 100 may start pipe search.

The air conditioning system may selectively perform any one of the pipe search method according to the above-described embodiment or the pipe search method according to the present embodiment according to an operator's command.

In the pipe search method of the air conditioning system according to the present embodiment, the first four sides of the indoor heat exchangers 25 and 26 of the indoor units 21 and 22 connected to the first four sides 41 to condense the refrigerant. (41) is controlled, and in the indoor heat exchangers (27) (28) of the indoor units (23) (24) connected to the second four sides (42), the four sides (42) are controlled so that the refrigerant evaporates. Edge control step; Operating steps of turning on the plurality of indoor units (21) (22) (23) (24); And a matching step of matching the indoor unit having the temperature of the indoor heat exchanger to the first four sides 41 and matching the indoor unit having the temperature of the indoor heat exchanger to the second four sides 42.

Hereinafter, a pipe search method according to the present embodiment will be described in more detail.

The pipe search method according to the present embodiment is the same as the simultaneous heating and cooling operation (see FIG. 4) in which the first system indoor units 21 and 22 are heated and the second system indoor units 23 and 24 are cooled. The common four sides 40, the first four sides 41 and the second four sides 42 may be implemented in a controlled state. That is, the controller 100 may turn on the common four sides 40 and the first four sides 41 and maintain the second four sides 42 in an off state (S41).

Thereafter, the controller 100 may turn on all the indoor units 21, 22, 23, and 24 (S42). In this case, the refrigerant circulating in the cooling cycle may be condensed in the first system indoor heat exchanger 25 and 26 and evaporated in the outdoor heat exchanger 32 and the second system indoor heat exchanger 27 and 28.

After all the indoor units 21, 22, 23, 24 are turned on and a predetermined time has elapsed, the temperature of each indoor unit 21, 22, 23, 24 may be transmitted to the controller 100. have. More specifically, the temperature of the indoor heat exchangers 25, 26, 27, 28 of each indoor unit 21, 22, 23, 24 may be transferred to the controller 100. The temperature of each indoor heat exchanger 25, 26, 27, 28 is the liquid temperature sensor 61A, 62A provided at the inlet and outlet of each indoor heat exchanger 25, 26, 27, 28. It can be calculated by the temperature sensed by the (63A) 64A and the gas temperature sensors 61B, 62B, 63B, 64B, respectively. It is well known to calculate the temperature of the heat exchanger according to the inlet / outlet temperature of the heat exchanger.

The controller 100 sequentially stores a plurality of (N, for example, N = 4) indoor units 21, 22, 23, and 24 in the first or second quadrangle 41. Can be matched with At this time, each indoor unit may be referred to as a K-th indoor unit according to the matching order of the plurality of indoor units. That is, the controller 100 may sequentially match the first indoor unit, the second indoor unit, the third indoor unit to the Nth indoor unit with the first quadrangle 41 or the second quadrangle 42. .

When the temperature of the K-th indoor unit rises, that is, becomes higher than the preset temperature, the controller 100 may match the K-th indoor unit with the first four-sided 41 (S43). On the contrary, when the temperature of the K-th indoor unit decreases, that is, becomes lower than the preset temperature, the controller 100 may match the K-th indoor unit with the second quadrilateral 42 (S43).

For example, when the K-th indoor unit is included in the first system 20A, the indoor heat exchanger of the K-th indoor unit is heated by a high-temperature refrigerant to increase the temperature, whereby the K-th indoor unit is It can be matched with one quadrilateral (41).

On the other hand, if the K-th indoor unit is included in the second system 20B, the indoor heat exchanger of the K-th indoor unit is cooled by a low-temperature refrigerant to decrease the temperature, whereby the K-th indoor unit has a second square It may match the side 42.

The controller 100 may store information regarding whether the K-th indoor unit is matched to either the first four sides 41 or the second four sides 42 in the storage unit 103.

Thereafter, the controller 100 may determine whether K is equal to N (S46). If K is smaller than N, it means that not all indoor units have yet been matched, so that K increases by 1 (S47) so that the next indoor unit can be matched with the first or second quadrangle (41). Can be. If K is equal to N, it means that matching of all indoor units is completed, so that the pipe search can be ended.

11 is a flowchart illustrating a method of determining whether an indoor unit is controllable according to an input air conditioning command.

As described above, the indoor units 21, 22, 23, 24 belonging to the same system 20A, 20B may be operated only in the same mode, and may not be operated in different modes. Therefore, the controller 100 uses the matching information of each indoor unit 21, 22, 23, 24 stored in the storage unit 103 after the pipe search is completed, so that each indoor unit 21, 22 ( 23) can perform the heating and cooling operation (24).

When a user inputs a cooling / heating mode start command of one indoor unit among a plurality of indoor units 21, 22, 23, and 24 to the input unit 101, the controller 100 is input by the indoor unit. It is possible to determine whether control is possible according to the air conditioning command.

In more detail, the controller 100 may determine whether there is another indoor unit in operation in the system 20A, 20B corresponding to the one indoor unit in which the cooling / heating mode command is input (S51). For example, when a cooling / heating command is input to one of the first system indoor units 21, the controller 100 may determine whether the other first system indoor unit 22 is in operation.

When there is no indoor unit in operation in the system 20A, 20B corresponding to the indoor unit, the controller 100 may operate the indoor unit in the input command mode (S51) (S53).

On the other hand, if there is an indoor unit that is operating in the system 20A (20B) corresponding to the indoor unit, the controller 100 checks whether the cooling / heating mode of the indoor unit in operation matches the command mode of the indoor unit. Can be determined (S52).

When the cooling / heating mode of the indoor unit in operation and the command mode of the one indoor unit coincide, the controller 100 may operate the one indoor unit in the input command mode (S52) (S53). For example, when a cooling command is input to the first system indoor unit 21, if another first system indoor unit 22 is in the cooling operation, the controller 100 sets the first system indoor unit to the cooling mode. You can start driving.

On the other hand, when the cooling / heating mode of the indoor unit in operation is different from the command mode of the indoor unit, the controller 100 may output the heterogeneous driving status notification through the output unit 102. For example, when a cooling command is input to the first system indoor unit 21, if another first system indoor unit 22 is heating, the controller 100 is currently cooling because the first system 20A is heating. It can display a notification that driving is not possible.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10: outdoor unit 21, 22: first system indoor unit
23, 24: second system indoor unit 25, 26: first system indoor heat exchanger
27, 28: second system indoor heat exchanger 31: compressor
32: outdoor heat exchanger 33: outdoor expansion mechanism
40: common directions 41: first direction
42: second quadrilateral 51: first temperature sensor
52: second temperature sensor

Claims (14)

A compressor for discharging the refrigerant sucked into the suction passage to the discharge passage;
A common four-sided valve for selectively communicating the discharge passage or the suction passage with an outdoor heat exchanger;
First and second quadrilateral sides connected in parallel to the discharge passage and the suction passage;
A plurality of first system indoor units connected in parallel to the first four sides and selectively communicating with the discharge passage or the suction passage;
A plurality of second system indoor units connected in parallel to the second four sides and selectively communicating with the discharge passage or the suction passage; And
And a liquid flow path connecting the plurality of first system indoor units and the plurality of second system indoor units to the outdoor heat exchanger. The method of claim 1,
A first suction side connection channel connected to the first four sides and in communication with the suction channel;
A first discharge side connection passage connected to the first four sides and in communication with the discharge passage;
A second suction side connection path connected to the second four sides and in communication with the suction path; And
And a second discharge side connection passage connected to the second four sides and in communication with the discharge passage. The method of claim 2,
A first temperature sensor provided in the first suction side connection passage; And
The second suction side connection passage further comprises a second temperature sensor provided. The method of claim 2,
A first gas passage connected to the first four sides and selectively communicating with the first discharge side connection passage or the first suction side connection passage;
A plurality of first gas branch passages branched from the first gas passages and connected to the plurality of first system indoor units, respectively;
A second gas passage connected to the second four sides and selectively communicating with the second discharge side connection passage or the second suction side connection passage; And
And a plurality of second gas branch passages branched from the second gas passages and connected to the plurality of second system indoor units, respectively. The method of claim 1,
And a plurality of liquid branching passages branched from the liquid passage and connected to the plurality of first system indoor units and the plurality of second system indoor units, respectively. The method of claim 1,
In all room cooling operations in which cooling is performed in a plurality of first indoor units and a plurality of second indoor units,
The common four sides communicate the outdoor heat exchanger with the discharge passage,
The first quadrilateral communicates the plurality of first system indoor units with the suction passage,
And said second four-sided side communicates said plurality of second system indoor units with said suction passage. The method of claim 1,
In all rooms heating operation in which heating is performed in a plurality of first system indoor units and a plurality of second system indoor units,
The common four sides communicate the outdoor heat exchanger with the suction passage,
The first four sides communicate the plurality of first system indoor units with the discharge passage,
And said second four-sided side communicates said plurality of second system indoor units with said discharge passage. The method of claim 1,
In the simultaneous operation of cooling and heating in which cooling is performed in a plurality of first system indoor units and heating is performed in a plurality of second system indoor units,
The common four sides communicate the outdoor heat exchanger with the suction passage,
The first quadrilateral communicates the plurality of first system indoor units with the suction passage,
And said second four-sided side communicates said plurality of second system indoor units with said discharge passage. A plurality of indoor units connected to a first or second quadrilateral, a first temperature sensor to sense a temperature of the refrigerant passing through the first four sides, and a temperature of the refrigerant passing through the second four sides Regarding the pipe search method of the air conditioning system including a second temperature sensor to
An initial operation step of turning on any one indoor unit of the plurality of indoor units;
An initial matching step of matching any one indoor unit with the first or second quadrilateral according to the sensed temperature of the first temperature sensor;
An operation step of turning on another indoor unit of the plurality of indoor units; And
When any one indoor unit is matched with a first square side, the other indoor unit is matched with the first or second quadrangle according to a sensed temperature of the second temperature sensor, and the one If the indoor unit is matched with a second square, air conditioning including a matching step of matching the other indoor unit with the first or second sides according to the detected temperature of the first temperature sensor How to navigate piping in your system. The method of claim 9,
An off step of turning off the other indoor unit;
An additional operation step of turning on another indoor unit of the plurality of indoor units; And
When the one indoor unit is matched with the first square, the other indoor unit is matched with the first or second quadrilateral according to the detected temperature of the second temperature sensor. If one indoor unit is matched with a second quadrilateral, an additional matching step of matching the another indoor unit with the first or second quadrilateral according to the sensed temperature of the first temperature sensor is further performed. Piping search method of an air conditioning system comprising. The method of claim 9,
The initial matching step,
Sensing the temperature by the first temperature sensor after the predetermined time has elapsed after the one indoor unit is turned on; And
When the sensing temperature of the first temperature sensor is lower than the predetermined temperature, the indoor unit is matched with the first four sides, and when the sensing temperature of the first temperature sensor is maintained above the predetermined temperature, the any one And matching the indoor unit with the second quadrilateral. The method of claim 9,
When any one indoor unit is matched with a first square in the initial matching step, the matching step may include:
Sensing a temperature by the second temperature sensor after the other indoor unit is turned on and a predetermined time elapses; And
When the sensing temperature of the second temperature sensor is lower than the preset temperature, the other indoor unit is matched with the second quadrilateral, and when the sensing temperature of the second temperature sensor is maintained above the preset temperature, the other one And matching the indoor unit with the first quadrilateral. The method of claim 9,
When any one indoor unit is matched with a second square in the initial matching step, the matching step may include:
Sensing a temperature by the first temperature sensor after the other indoor unit is turned on and a predetermined time elapses; And
When the sensing temperature of the first temperature sensor is lower than the preset temperature, the other indoor unit is matched with the first four sides, and when the sensing temperature of the first temperature sensor is maintained above the predetermined temperature, the other one And matching the indoor unit with the second quadrilateral. A pipe search method of an air conditioning system including a plurality of indoor units connected to a first or second quadrature and each indoor unit includes an indoor heat exchanger and a temperature sensor for measuring a temperature change of the indoor heat exchanger. ,
The first four sides are controlled to condense refrigerant in the indoor heat exchanger of the indoor unit connected to the first four sides, and the second four sides are controlled to evaporate the refrigerant in the indoor heat exchanger of the indoor unit connected to the second four sides. Four sides control step;
Operating the plurality of indoor units to turn on; And
An indoor unit having an elevated temperature of an indoor heat exchanger is matched with the first quadrilateral, and an indoor unit having a lowered temperature of an indoor heat exchanger is matched with the second quadrilateral. .

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