Air conditioner

Abstract

This air conditioner comprises: a compressor to which a compressor suction pipe and a compressor discharge pipe are connected and which compresses refrigerant; an outdoor heat exchanger to which a liquid line and a connection pipe are connected; a first channel switching valve connected to each of the compressor suction pipe, the connection pipe, and a switching valve connection pipe; a second channel switching valve connected to each of the compressor discharge pipe, a high-pressure tube, and the compressor suction pipe; a third channel switching valve connected to each of the compressor discharge pipe, a low-pressure tube, and a switching valve connection pipe; at least one expansion valve installed on the liquid line; a first water refrigerant heat exchanger connected to each of the high-pressure tube and the liquid line; a second water refrigerant heat exchanger connected to each of the low-pressure tube and the liquid line; and a plurality of indoor units which are connected to each of the first water refrigerant heat exchanger and the second water refrigerant heat exchanger via water pipes.

Description

air conditioner

[0001] The present invention relates to an air conditioner.

[0002] An air conditioner is a heating and cooling device that transfers a low-temperature heat source to a high-temperature one or transfers a high-temperature heat source to a low-temperature one by using the heat generation or condensation heat of a refrigerant.

[0003] An air conditioner may include a refrigeration cycle, and may cool or heat a room by including a compressor that compresses a refrigerant, a heating / cooling switching valve that switches between cooling and heating operations by changing the flow direction of the refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outdoor air, an expansion device that expands the refrigerant, and an indoor heat exchanger that exchanges heat between the refrigerant and indoor air.

[0004] Conventional air conditioners, because they cool or heat entire rooms, have limitations in meeting the air conditioning needs of each room. To address this issue, research is currently underway on simultaneous cooling and heating multi-unit air conditioners, where some indoor units perform cooling operations while others perform heating operations.

[0005] Korean Patent Publication No. 10-2022-0006336 A (published on January 17, 2022) discloses a simultaneous cooling and heating air conditioner, comprising: an outdoor unit including a compressor for compressing a refrigerant; and an outdoor heat exchanger for heat-exchanging the refrigerant with outdoor air; indoor units each including one or more indoor heat exchangers; and distributors disposed between the outdoor unit and the indoor units to distribute the refrigerant to the indoor units according to operating conditions.

[0006] The distributor is connected to the outdoor unit through a liquid pipe, a high-pressure refrigerant pipe, and a low-pressure refrigerant pipe, and is connected to each of the indoor unit's heat exchangers and the indoor engine.

[0007] The distributor includes a liquid refrigerant header connecting the liquid pipes and each of the plurality of heat exchangers, a high-pressure refrigerant header connecting the high-pressure refrigerant pipes and each of the plurality of heat exchangers, and a low-pressure refrigerant header connecting the low-pressure refrigerant pipes and each of the plurality of heat exchangers.

[0008] Each of the multiple indoor units is equipped with a control valve that regulates the flow of refrigerant. The control valves include a high-pressure valve and a low-pressure valve.

[0009] The present embodiment provides an air conditioner that does not require a high pressure valve and a low pressure valve.

[0010] The present embodiment provides an air conditioner capable of simultaneously cooling and heating multiple indoor units without pressure drop due to high-pressure valves and low-pressure valves.

[0011] The present embodiment provides an air conditioner capable of performing heating and cooling by allowing water to flow into the indoor unit instead of refrigerant to flow into the indoor unit.

[0012] An air conditioner according to the present embodiment may include a compressor having a compressor suction pipe and a compressor discharge pipe connected thereto; an outdoor heat exchanger having a liquid pipe and a connection pipe connected thereto; a first flow-change valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the connection pipe; a second flow-change valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the high-pressure engine; a third flow-change valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the low-pressure engine; an expansion valve installed in the liquid pipe; a first water-refrigerant heat exchanger connected to each of the high-pressure engine and the liquid pipe; a second water-refrigerant heat exchanger connected to each of the low-pressure engine and the liquid pipe; and a plurality of indoor units connected to each of the first water-refrigerant heat exchanger and the second water-refrigerant heat exchanger through water pipes.

[0013] The compressor suction pipe may include a common suction pipe in which an accumulator is arranged; a first combined pipe connected to the common suction pipe and a first directional changeover valve; a second combined pipe connected to the common suction pipe and a second directional changeover valve; and a third combined pipe connected to the common suction pipe and a third directional changeover valve.

[0014] The compressor discharge pipe may include a common discharge pipe having an oil separator arranged therein; a first branch pipe connected to a first directional valve; a second branch pipe connected to the common discharge pipe and a second directional valve; and a third branch pipe connected to the common discharge pipe and a third directional valve.

[0015] One end of the first branch pipe can be connected to one of the second branch pipe and the third branch pipe, and the other end of the first branch pipe can be connected to the first euro changeover valve.

[0016] The liquid pipe may include a common liquid pipe; a first branch liquid pipe connected to each of the first water refrigerant heat exchanger and the common liquid pipe; and a second branch liquid pipe connected to each of the second water refrigerant heat exchanger and the common liquid pipe.

[0017] The expansion valve may include an outdoor expansion valve disposed in the common liquid pipe; a first expansion valve disposed in the first branch liquid pipe; and a second expansion valve disposed in the second branch liquid pipe.

[0018] The first Euro switching valve is turned off during cooling, so that the refrigerant flowing from the compressor discharge pipe can be guided to the connecting pipe.

[0019] The first Euro switching valve is turned on during heating, so that the refrigerant flowing in from the connecting pipe can be guided to the compressor suction pipe.

[0020] The second Euro switching valve is turned on during cooling-only operation, cooling-only operation, and heating-only operation, and can guide the refrigerant flowing from the high-pressure engine to the compressor suction pipe.

[0021] The second Euro switching valve is turned off during heating-only operation, allowing the refrigerant flowing from the compressor discharge pipe to be guided to the high-pressure engine.

[0022] The third Euro switching valve is turned off during heating-only operation, cooling-only operation, and heating-only operation, so that the refrigerant flowing in from the compressor discharge pipe can be guided to the low-pressure engine.

[0023] The third Euro switching valve can be turned on during cooling-only operation and guide the refrigerant flowing in from the low-pressure engine to the compressor suction pipe.

[0024] The water piping may include a first inlet pipe and a first outlet pipe connected to the first water refrigerant heat exchanger; and a second inlet pipe and a second outlet pipe connected to the second water refrigerant heat exchanger.

[0025] A first pump may be placed in the first inlet pipe, and a second pump may be placed in the second inlet pipe.

[0026] The air conditioner is placed in the water pipe and may include a plurality of valves that allow cold or hot water to flow.

[0027] The valve group can correspond 1:1 with the indoor unit.

[0028] Each of the plurality of valve groups includes a first valve connected to the first outlet pipe; a second valve connected to the second outlet pipe; and a three-way valve connected to the outlet pipe of the indoor unit and each of the first inlet pipe and the second inlet pipe.

[0029] The indoor unit's inlet pipe can be connected to the first valve and the second valve.

[0030] According to this embodiment, multiple indoor units can be simultaneously cooled and heated by three euro changeover valves and two water-refrigerant heat exchangers, and since high-pressure valves and low-pressure valves are not required, the pressure loss of the refrigerant due to the high-pressure valves and low-pressure valves can be minimized, and the efficiency of the air conditioner can be increased.

[0031] Additionally, since high pressure and low pressure valves are not required, noise can be minimized compared to when high pressure and low pressure valves are used.

[0032] Additionally, two water-refrigerant heat exchangers can be switched between evaporators and condensers by three-way switching valves, making it easy to switch water-refrigerant heat exchangers.

[0033] Additionally, because water flows instead of refrigerant flowing through multiple indoor units, indoor safety is improved.

[0034] Figure 1 is a diagram of an air conditioner according to the present embodiment.

[0035] Figure 2 is an enlarged view of A shown in Figure 1.

[0036] Figure 3 is a control block diagram of an air conditioner according to the present embodiment.

[0037] Figure 4 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in cooling-only operation.

[0038] Figure 5 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in heating-only operation.

[0039] Figure 6 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in cooling operation.

[0040] Fig. 7 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in heating-main operation.

[0041] Hereinafter, specific embodiments of the present invention will be described in detail with drawings.

[0042] Fig. 1 is a diagram of an air conditioner according to the present embodiment, and Fig. 2 is an enlarged diagram of A shown in Fig. 1.

[0043] An air conditioner according to the present embodiment may include an outdoor unit (O), a distributor (D), and a plurality of indoor units (I), as illustrated in FIG. 1.

[0044] The air conditioner can selectively perform cooling-only operation, heating-only operation, cooling-only operation, and heating-only operation.

[0045] Cooling-only operation may be an operation in which all of the indoor units (I) are cooling, heating-only operation may be an operation in which all of the indoor units (I) are heating, cooling-main operation may be an operation in which the cooling load is greater than the heating load, and cooling-main operation may be an operation in which the heating load is greater than the cooling load.

[0046] The air conditioner can perform cooling-based operation when the capacity of the indoor unit in cooling operation among multiple indoor units (I) is greater than the capacity of the indoor unit in heating operation among multiple indoor units (I).

[0047] The air conditioner can perform heating operation when the capacity of the indoor unit in heating operation among multiple indoor units (I) is greater than the capacity of the indoor unit in cooling operation among multiple indoor units (I).

[0048] An air conditioner may include a compressor (1), an outdoor heat exchanger (2), an outdoor fan (3), and a plurality of flow-through switching valves. The compressor (1), the outdoor heat exchanger (2), the outdoor fan (3), and the plurality of flow-through switching valves may constitute an outdoor unit (O) installed outdoors.

[0049] The multiple-euro switching valve may be a valve that switches the flow direction of the refrigerant according to cooling operation, heating operation, dedicated operation, and main operation.

[0050] The multiple euro switching valve may include a first euro switching valve (4); a second euro switching valve (5) and a third euro switching valve (6).

[0051] The air conditioner may include a first water-refrigerant heat exchanger (7) and a second water-refrigerant heat exchanger (8).

[0052] The air conditioner can simultaneously cool and heat multiple indoor units (I) by means of three Euro switching valves (4, 5, 6) and two water-refrigerant heat exchangers (7, 8).

[0053] The first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) can constitute a distributor (D). The first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) can distribute water supplied to a plurality of indoor units (I).

[0054] The first euro switching valve (4) can switch the refrigerant flow path so that the refrigerant compressed in the compressor (1) flows to the outdoor heat exchanger (2) during cooling operation (cooling-only operation and cooling-main operation).

[0055] The first euro switching valve (4) can switch the refrigerant flow path so that the refrigerant evaporated in the outdoor heat exchanger (2) flows to the compressor (1) during heating operation (heating-only operation and heating main operation).

[0056] The first euro switching valve (4) may be a heating / cooling switching valve that can switch the outdoor unit (O) between cooling operation and heating operation.

[0057] The second euro switching valve (5) can switch the refrigerant flow path so that the refrigerant flowing in at least one of the first and second water-refrigerant heat exchangers (7)(8) flows to the compressor (1) during cooling operation (cooling-only operation and cooling-main operation) and heating-main operation.

[0058] The second euro switching valve (5) can switch the refrigerant flow path so that the refrigerant compressed in the compressor (1) flows to the first and second water refrigerant heat exchangers (7)(8) during heating-only operation.

[0059] The third euro switching valve (6) can switch the refrigerant flow path so that the refrigerant flowing in at least one of the first and second water-refrigerant heat exchangers (7)(8) flows to the compressor (1) during cooling-only operation.

[0060] The third euro switching valve (6) can switch the refrigerant flow path so that the refrigerant compressed in the compressor (1) flows to at least one of the first and second water-refrigerant heat exchangers (7)(8) during cooling-only operation and heating operation (heating-only operation and heating-only operation).

[0061] A compressor suction pipe (11) and a compressor discharge pipe (16) can be connected to the compressor (1).

[0062] The compressor (1) can compress refrigerant sucked through the compressor suction pipe (11) and discharge the compressed refrigerant through the compressor discharge pipe (16).

[0063] The compressor suction pipe (11) may include a common suction pipe (12), a first joint pipe (13), a second joint pipe (14), and a third joint pipe (15).

[0064] An accumulator (12a) can be placed in the common suction pipe (12).

[0065] The common suction pipe (12) may include a first suction pipe (12b) that guides refrigerant to an accumulator (12a), as shown in FIG. 2, and a second suction pipe (12c) that guides refrigerant from the accumulator (12a) to a compressor suction port.

[0066] The first suction pipe (12b) can be connected to a merging point where at least two of the first joint pipe (13), the second joint pipe (14), and the third joint pipe (15) are joined, and to an accumulator (12a).

[0067] The second suction pipe (12c) can be connected to the accumulator (12a) and the compressor suction port, respectively.

[0068] The first joint pipe (13) can be connected to the common suction pipe (12) and the first euro switching valve (4).

[0069] The second joint pipe (14) can be connected to the common suction pipe (12) and the second euro switching valve (5).

[0070] The second joint pipe (14) can be joined to the first joint pipe (13) or the third joint pipe (15). One end of the second joint pipe (14) can be connected to the second euro switching valve (5), and the other end of the second joint pipe (14) can be connected to the first joint pipe (13).

[0071] The third joint pipe (15) can be connected to the common suction pipe (12) and the third euro switching valve (6).

[0072] The third joint pipe (15) can be joined to the first joint pipe (13) or the second joint pipe (14). One end of the third joint pipe (15) can be connected to the third euro switching valve (6), and the other end of the third joint pipe (15) can be connected to the first joint pipe (13).

[0073] The compressor discharge pipe (16) may include a common discharge pipe (17), a first branch pipe (18), a second branch pipe (19), and a third branch pipe (20).

[0074] An oil separator (17a) can be placed in the common discharge pipe (17).

[0075] As shown in Fig. 2, the common discharge pipe (17) may include a first discharge pipe (17b) that guides the refrigerant discharged from the compressor (1) to an oil separator (17a), and a second discharge pipe (17c) that guides the refrigerant of the oil separator (17a) to a second branch pipe (19) and a third branch pipe (20).

[0076] The first discharge pipe (17b) can be connected to the discharge port of the compressor (1) and the oil separator (17a).

[0077] One end of the second discharge pipe (17c) can be connected to an oil separator (17a). The other end of the second discharge pipe (17c) can be connected to a branch point (17d) of the second branch pipe (19) and the third branch pipe (20).

[0078] The first branch pipe (18) can be connected to the third branch pipe (20) and the first flow switching valve (4). One end of the first branch pipe (18) can be connected to the third branch pipe (20), and the other end of the first branch pipe (18) can be connected to the first flow switching valve (4). The first branch pipe (18) can guide the refrigerant to the first flow switching valve (4).

[0079] The second branch pipe (19) can be connected to the common discharge pipe (17) and the second flow switching valve (5). One end of the second branch pipe (19) can be connected to the branch point (17d), and the other end of the second branch pipe (19) can be connected to the second flow switching valve (5). The second branch pipe (19) can guide the refrigerant to the second flow switching valve (5).

[0080] The third branch pipe (20) can be connected to the common discharge pipe (17) and the third flow switching valve (6). One end of the third branch pipe (20) can be connected to the branch point (17d), and the other end of the third branch pipe (20) can be connected to the third flow switching valve (6). The third branch pipe (20) can guide the refrigerant to the third flow switching valve (6).

[0081] A liquid pipe (21) can be connected to one side of the outdoor heat exchanger (2).

[0082] The liquid pipe (21) may include a common liquid pipe (22), a first branch liquid pipe (23) connected to the first water refrigerant heat exchanger (7), and a second branch liquid pipe (24) connected to the second water refrigerant heat exchanger (8).

[0083] The first branch pipe (23) and the second branch pipe (24) can be branched from the common pipe (22).

[0084] The air conditioner may include an expansion valve installed in the liquid pipe (21).

[0085] A plurality of expansion valves may be provided in the liquid pipe (21). The expansion valves may include an outdoor expansion valve (25) arranged in the common liquid pipe (22), a first expansion valve (26) arranged in the first branch liquid pipe (23), and a second expansion valve (28) arranged in the second branch liquid pipe (24).

[0086] A connecting pipe (28) can be connected to the other side of the outdoor heat exchanger (2).

[0087] The connecting pipe (28) can connect the outdoor heat exchanger (2) and the first euro switching valve (4).

[0088] The connecting pipe (28) can guide the refrigerant flowing from the first flow switching valve (4) to the outdoor heat exchanger (2). The connecting pipe (28) can guide the refrigerant flowing from the outdoor heat exchanger (2) to the first flow switching valve (4).

[0089] The first euro switching valve (4) can be connected to each of the compressor suction pipe (11), the compressor discharge pipe (16), and the connecting pipe (28).

[0090] The first euro switching valve (4) can be connected to the first joint pipe (13) of the compressor suction pipe (11).

[0091] The first euro switching valve (4) can be connected to the first branch pipe (17) of the compressor discharge pipe (16).

[0092] The refrigerant discharged from the compressor (1) can sequentially pass through the third branch pipe (20) and the first branch pipe (17) and flow into the first flow switching valve (4).

[0093] The first euro switching valve (4) may have three ports. The first euro switching valve (4) may include a first branch pipe port to which the first branch pipe (13) is connected. The first euro switching valve (4) may include a first branch pipe port to which the first branch pipe (17) is connected. The first euro switching valve (4) may include a connection pipe port to which the connection pipe (28) is connected.

[0094] The first euro switching valve (4) can be controlled in a compressor supply mode that guides the refrigerant to the compressor (1). In the compressor supply mode, the first euro switching valve (4) can guide the refrigerant flowing in the connecting pipe (28) to the first joint pipe (13).

[0095] The first flow switching valve (4) can be controlled in an outdoor heat exchanger supply mode that guides refrigerant to the outdoor heat exchanger (2). In the outdoor heat exchanger supply mode, the first flow switching valve (4) can guide refrigerant introduced through the first branch pipe (17) from the third branch pipe (20) to the connecting pipe (28).

[0096] The first euro switching valve (4) may be an outdoor heat exchanger switching valve (or heating / cooling switching valve) that determines the flow direction of the refrigerant flowing to the outdoor heat exchanger (2).

[0097] The second euro switching valve (5) can be connected to each of the compressor suction pipe (11), the compressor discharge pipe (16), and the high pressure engine (51).

[0098] The second euro switching valve (5) can be connected to the second joint pipe (14) of the compressor suction pipe (11).

[0099] The second euro switching valve (5) can be connected to the second branch pipe (19) of the compressor discharge pipe (16).

[0100] The second euro switching valve (5) may have three ports. The second euro switching valve (5) may include a second branch pipe port to which the second branch pipe (14) is connected. The second euro switching valve (5) may include a third branch pipe port to which the second branch pipe (19) is connected. The second euro switching valve (5) may include a high pressure engine port to which the high pressure engine (51) is connected.

[0101] The second euro switching valve (5) can be controlled in a compressor supply mode that guides refrigerant to the compressor. In the compressor supply mode, the second euro switching valve (5) can guide refrigerant introduced from the high-pressure engine (51) to the second composite pipe (14).

[0102] The second euro switching valve (5) can be controlled in a high-pressure engine supply mode that guides the refrigerant to the high-pressure engine (51). In the high-pressure engine supply mode, the second euro switching valve (5) can guide the refrigerant flowing in the second branch pipe (19) to the high-pressure engine (51).

[0103] The second euro changeover valve (5) may be a first water-refrigerant heat exchanger changeover valve (or a cooling / heating changeover valve) that determines the flow direction of the refrigerant flowing to the first water-refrigerant heat exchanger (7).

[0104] The third euro switching valve (6) can be connected to each of the compressor suction pipe (11), the compressor discharge pipe (16), and the low pressure engine (61).

[0105] The third euro switching valve (6) can be connected to the third joint pipe (15) of the compressor suction pipe (11).

[0106] The third euro switching valve (6) can be connected to the third branch pipe (20) of the compressor discharge pipe (16).

[0107] The third euro switching valve (6) may have three ports. The third euro switching valve (6) may include a third branch pipe port to which the third branch pipe (15) is connected. The third euro switching valve (6) may include a third branch pipe port to which the third branch pipe (20) is connected. The third euro switching valve (6) may include a low pressure engine port to which the low pressure engine (61) is connected.

[0108] The third euro switching valve (6) can be controlled in a compressor supply mode that guides the refrigerant to the compressor (1). In the compressor supply mode, the third euro switching valve (6) can guide the refrigerant guided to the low pressure engine (61) to the third joint pipe (15).

[0109] The third euro switching valve (6) can be controlled in a low-pressure engine supply mode that guides the refrigerant to the low-pressure engine (61). In the low-pressure engine supply mode, the third euro switching valve (6) can guide the refrigerant guided from the compressor third branch pipe (20) to the low-pressure engine (61).

[0110] The third euro changeover valve (6) may be a second water-refrigerant heat exchanger changeover valve (or heating / cooling changeover valve) that determines the flow direction of the refrigerant flowing to the second water-refrigerant heat exchanger (8).

[0111] The first water refrigerant heat exchanger (7) can be connected to each of the high pressure engine (51) and the liquid pipe (21).

[0112] The first water refrigerant heat exchanger (7) can be connected to the first branch liquid pipe (23) among the liquid pipes (21).

[0113] The refrigerant flowing into the first water-refrigerant heat exchanger (7) from the first branch pipe (23) can flow to the high-pressure engine (51) after exchanging heat with water in the first water-refrigerant heat exchanger (7).

[0114] The refrigerant flowing into the first water-refrigerant heat exchanger (7) from the high-pressure engine (51) can flow in the first branch liquid pipe (23) after exchanging heat with water in the first water-refrigerant heat exchanger (7).

[0115] The second water refrigerant heat exchanger (8) can be connected to each of the low pressure engine (61) and the liquid pipe (21). The second water refrigerant heat exchanger (8) can be connected to the second branch liquid pipe (24) among the liquid pipes (21).

[0116] The refrigerant flowing into the second water-refrigerant heat exchanger (8) from the second branch pipe (24) can flow to the low-pressure engine (61) after heat exchange with water in the second water-refrigerant heat exchanger (8).

[0117] The refrigerant flowing into the second water-refrigerant heat exchanger (8) from the low-pressure engine (61) can flow into the second branch liquid pipe (24) after exchanging heat with water in the second water-refrigerant heat exchanger (8).

[0118] Each of the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) may be formed with a refrigerant passage through which the refrigerant passes and a passage through which water passes. The refrigerant passing through the refrigerant passage can cool or heat the water passing through the water passage.

[0119] One example of each of the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) may be a plate heat exchanger, and another example may be a double-pipe heat exchanger.

[0120] Hereinafter, for convenience of explanation, it is described as a plate heat exchanger, but of course, it is not limited to that type as long as it can exchange heat between water and refrigerant.

[0121] A plurality of indoor units (I) can be connected to each of the first water-refrigerant heat exchanger (8) and the second water-refrigerant heat exchanger (8) through water pipes (10).

[0122] Hereinafter, for convenience of explanation, it is explained that four indoor units are provided, but of course, the number is not limited.

[0123] In multiple indoor units (I), refrigerant may not flow, but water may flow.

[0124] Each of the plurality of indoor units (I) may include a fan coil unit (FCU) through which water passes. An indoor unit inlet pipe (91) and an indoor unit outlet pipe (92) may be connected to the fan coil unit (FCU). Water heated or cooled in the first water-refrigerant heat exchanger (7) or the second water-refrigerant heat exchanger (8) may be introduced into the fan coil unit (FCU) through the indoor unit inlet pipe (91) and may be discharged through the indoor unit outlet pipe (92).

[0125] The indoor unit inlet pipe (91) may include a common inlet pipe, a first composite inlet pipe connected to the common inlet pipe, and a second composite inlet pipe connected to the common inlet pipe.

[0126] The common inlet piping can be connected to a fan coil unit (FCU).

[0127] One end of the first combined inlet pipe can be connected to the first valve (122), and the other end of the first combined inlet pipe can be connected to the junction point of the common inlet pipe.

[0128] One end of the second combined inlet pipe can be connected to the second valve (123), and the other end of the second combined inlet pipe can be connected to the junction point of the common inlet pipe.

[0129] Each of the plurality of indoor units (I) may further include an indoor fan for blowing indoor air to a fan coil unit (FCU).

[0130] The water pipe (10) may be a combination of multiple water pipes.

[0131] The water pipe (10) may include a first inlet pipe (101) and a first outlet pipe (102) connected to the first water refrigerant heat exchanger (7).

[0132] The first inlet pipe (101) can be connected to the water flow inlet of the first water-coolant heat exchanger (7). A first pump (103) can be arranged in the first inlet pipe (101).

[0133] The first inlet pipe (101) may include a first common inlet pipe in which a first pump (103) is arranged, and a plurality of first combined inlet pipes joined to the first common inlet pipe.

[0134] A plurality of first composite inlet pipes can be connected to a three-way valve (121) of a plurality of valve groups (G). The first composite inlet pipe and the three-way valve (121) can be connected in a 1:1 ratio.

[0135] The first outlet pipe (102) can be connected to the water flow outlet of the first water-refrigerant heat exchanger (7).

[0136] The first outlet pipe (102) may include a first common outlet pipe connected to the first water-coolant heat exchanger (7) and a plurality of first branch outlet pipes branched from the first common outlet pipe.

[0137] A plurality of first branch outlet pipes can be connected to the first valve (122) of each of the plurality of valve groups (G).

[0138] The first branch outlet pipe can correspond 1:1 with the first valve (122).

[0139] The water pipe (10) may include a second inlet pipe (111) and a second outlet pipe (112) connected to the second water refrigerant heat exchanger (8).

[0140] The second inlet pipe (111) can be connected to the water flow inlet of the second water-coolant heat exchanger (8). A second pump (113) can be arranged in the second inlet pipe (111).

[0141] The second inlet pipe (111) may include a second common inlet pipe in which a second pump (113) is arranged, and a plurality of second combined inlet pipes joined to the second common inlet pipe.

[0142] The plurality of second joint inlet pipes can be connected to the three-way valve (121) of the plurality of valve groups (G).

[0143] The second joint inlet pipe can correspond 1:1 with the three-way valve (121).

[0144] The second outlet pipe (112) can be connected to the water flow outlet of the second water-coolant heat exchanger (8).

[0145] The second outlet pipe (112) may include a second common outlet pipe connected to the second water-coolant heat exchanger (8) and a plurality of second branch outlet pipes branched from the second common outlet pipe.

[0146] The plurality of second branch outlet pipes can be connected to the second valve (122) of each of the plurality of valve groups (G).

[0147] The second branch outlet pipe can correspond 1:1 with the second valve (122).

[0148] The air conditioner is placed in a water pipe (10) and may include a plurality of valve groups (G) that allow cold water or hot water to flow.

[0149] A valve group (G) can correspond 1:1 with an indoor unit (I). If there are four indoor units (I), there can be four valve groups (G).

[0150] Each of the plurality of valve groups (G) may include a three-way valve (121).

[0151] The three-way valve (121) can be connected to the outlet pipe (92) of the indoor unit and each of the first inlet pipe (101) and the second inlet pipe (111). The three-way valve (121) can guide water discharged through the outlet pipe (92) of the indoor unit to the first inlet pipe (101) or the second inlet pipe (111).

[0152] The three-way valve (121) may include an outlet pipe port to which the outlet pipe (92) of the indoor unit is connected, a first inlet pipe port to which the first inlet pipe (101) is connected, and a second inlet pipe port to which the second inlet pipe (111) is connected.

[0153] The three-way valve (121) can recover water passing through the fan coil unit (FCU) to the first water-refrigerant heat exchanger (7) or the second water-refrigerant heat exchanger (8). The three-way valve (121) can guide water to the water-refrigerant heat exchanger that functions as an evaporator during cooling of the indoor unit (I). The three-way valve (121) can guide water to the water-refrigerant heat exchanger that functions as a condenser during heating of the indoor unit (I).

[0154] Each of the plurality of valve groups (G) may further include a first valve (122).

[0155] A first outlet pipe (102) may be connected to the first valve (122). A plurality of first branch outlet pipes may be connected to the first valve (122).

[0156] An example of the first valve (122) may be a 2-way valve.

[0157] The first valve (122) can be connected to the indoor unit's inlet pipe (91).

[0158] Each of the plurality of valve groups (G) may further include a second valve (123).

[0159] A second outlet pipe (112) may be connected to the second valve (123). A plurality of second branch outlet pipes may be connected to the second valve (122).

[0160] An example of the second valve (123) may be a 2-way valve.

[0161] The second valve (123) can be connected to the indoor unit's water intake pipe (91).

[0162] The first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8), the first pump (103), the second pump (113), and the plurality of valve groups (G) can be arranged inside the case (C) of the distributor (D).

[0163] Figure 3 is a control block diagram of an air conditioner according to the present embodiment.

[0164] The outdoor unit (O) may include a communication unit (130) and a control unit (140).

[0165] The communication unit (130) can communicate with at least one of the distributor (D) and the indoor unit (I). The communication unit (130) can transmit the mode (cooling mode or heating mode) of the indoor unit (I) to the control unit (140).

[0166] The control unit (140) can control the overall operation of the outdoor unit according to the signal transmitted from the communication unit (130).

[0167] The control unit (140) can control the compressor (1), the indoor fan (3), the first euro switching valve (4), the second euro switching valve (5), the third euro switching valve (6), and the outdoor expansion valve (25).

[0168] The control unit (140) can control the first euro switching valve (4), the second euro switching valve (5), and the third euro switching valve (6) according to the cooling and heating of the indoor unit (I).

[0169] The control unit (140) can control the first euro switching valve (4) to compressor supply mode or outdoor heat exchanger supply mode depending on the cooling and heating of the indoor unit (I).

[0170] The control unit (140) can turn the first euro switching valve (4) on and off according to the cooling and heating of the indoor unit (I).

[0171] The first euro changeover valve (4) can be in compressor supply mode when on and in outdoor heat exchanger supply mode when off.

[0172] The first euro switching valve (4) is turned on during heating and can guide the refrigerant flowing in from the connecting pipe (28) to the compressor suction pipe (11).

[0173] The first euro switching valve (4) is turned off during cooling, so that the refrigerant flowing in from the first branch pipe (17) can be guided to the connecting pipe (28).

[0174] The control unit (140) can control the second euro switching valve (5) to compressor supply mode or high-pressure engine supply mode depending on the cooling and heating of the indoor unit (I).

[0175] The control unit (140) can turn the second euro switching valve (5) on and off according to the cooling and heating of the indoor unit (I).

[0176] The second euro switching valve (5) can be in compressor supply mode when on and in high pressure engine supply mode when off.

[0177] The second euro switching valve (5) is turned on during cooling main operation, cooling only operation, and heating main operation, and can guide the refrigerant introduced from the high pressure engine (51) to the compressor suction pipe (11).

[0178] The second euro switching valve (5) is turned off during heating-only operation, so that the refrigerant flowing in from the compressor discharge pipe (16) can be guided to the high-pressure engine (61).

[0179] The control unit (140) can control the third euro switching valve (6) to compressor supply mode or low pressure engine supply mode depending on the cooling and heating of the indoor unit (I).

[0180] The control unit (140) can turn the third euro switching valve (6) on and off according to the cooling and heating of the indoor unit (I).

[0181] The third euro switching valve (6) can be in compressor supply mode when on, and in low pressure engine supply mode when off.

[0182] The third euro switching valve (6) can be turned on during cooling-only operation and guide the refrigerant flowing in from the low-pressure engine (61) to the compressor suction pipe (11).

[0183] The third euro switching valve (6) is turned off during heating-only operation, cooling-only operation, and heating-only operation, so that the refrigerant flowing in from the compressor discharge pipe (16) can be guided to the low-pressure engine (61).

[0184] Figure 4 is a diagram illustrating the refrigerant flow when the air conditioner according to the present embodiment is in cooling-only operation.

[0185] When the mode of all the indoor units (I) is cooling, the outdoor heat exchanger (2) can function as a condenser, and the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) can both function as evaporators.

[0186] In order for the outdoor heat exchanger (2) to function as a condenser, the first flow switching valve (4) is turned off, the second flow switching valve (5) is turned on to cool some of the multiple indoor units (I), and the third flow switching valve (6) is turned on to cool the remaining of the multiple indoor units (I).

[0187] When the first euro switching valve (4) is turned off, the second euro switching valve (5) is turned on, and the third euro switching valve (6) is turned on, the refrigerant compressed in the compressor (1) can all flow to the outdoor heat exchanger (2).

[0188] The refrigerant discharged from the compressor (1) flows toward the first flow switching valve (4), the second flow switching valve (5), and the third flow switching valve (6). The refrigerant is also blocked from flowing into the second flow switching valve (5) and the third flow switching valve (6), and is moved to the outdoor heat exchanger (2) by the first flow switching valve (4).

[0189] The refrigerant flowing into the outdoor heat exchanger (2) is condensed in the outdoor heat exchanger (2) and then guided to the liquid pipe (21). The refrigerant guided to the liquid pipe (21) is guided to the distributor (D).

[0190] The refrigerant passing through the first branch liquid pipe (23) among the liquid pipes (21) is expanded by the first expansion valve (26) and evaporated by the first water refrigerant heat exchanger (7).

[0191] The refrigerant passing through the second branch liquid pipe (24) among the liquid pipes (21) is expanded by the second expansion valve (27) and evaporated by the second water refrigerant heat exchanger (8).

[0192] The refrigerant evaporated in the first water-refrigerant heat exchanger (7) passes through the high-pressure engine (51) and is guided to the compressor suction pipe (11) by the second flow-change valve (5). The refrigerant evaporated in the second water-refrigerant heat exchanger (8) passes through the low-pressure engine (61) and is guided to the compressor suction pipe (11) by the third flow-change valve (6). The refrigerant guided to the compressor suction pipe (11) passes through the accumulator (12a) and is then sucked into the compressor (1).

[0193] Since both the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) function as evaporators, the air conditioner can only produce cold water, and the cold water can be moved to multiple indoor units (I) by the first pump (103) and the second pump (113).

[0194] The first valve (122) and the second valve (123) are turned on or off to supply cold water to multiple indoor units (I), and the three-way valve (121) is controlled to return the water passing through the indoor unit (I) to the water-refrigerant heat exchanger from which it was initially supplied.

[0195] To control the flow of water, the first valve (122) or the second valve (123) connected to each of the plurality of indoor units (I) of the cooling unit is opened.

[0196] The three-way valve (121) connected to each indoor unit is controlled so that water passing through the indoor unit with the first valve (122) open can be moved to the first water-refrigerant heat exchanger (7), and the second valve (123) is controlled so that water passing through the indoor unit with the second valve (123) open can be moved to the second water-refrigerant heat exchanger (8).

[0197] Figure 5 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in heating-only operation.

[0198] When the multiple indoor units (I) are all in heating mode, both the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) can function as condensers, and the outdoor heat exchanger (2) can function as an evaporator.

[0199] In order for the outdoor heat exchanger (2) to function as an evaporator, the first flow switching valve (4) is turned on, the second flow switching valve (5) is turned off to handle heating of some of the multiple indoor units, and the third flow switching valve (6) is also turned off to handle heating of the remaining multiple indoor units.

[0200] When the first euro switching valve (4) is turned on, the second euro switching valve (5) is turned off, and the third euro switching valve (6) is turned off, the refrigerant compressed in the compressor (1) can be distributed and flowed to the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8).

[0201] The refrigerant discharged from the compressor (1) flows toward the first flow switching valve (4), the second flow switching valve (5), and the third flow switching valve (6). The refrigerant may be blocked from flowing into the first flow switching valve (4), some of the refrigerant may flow to the high-pressure engine (51) by the second flow switching valve (5), and the remainder of the refrigerant may flow to the low-pressure engine (61) by the third flow switching valve (6).

[0202] The refrigerant guided to the high pressure engine (51) is guided to the distributor (D), condensed by the first water refrigerant heat exchanger (7), and then flows to the first branch liquid pipe (23).

[0203] The refrigerant guided to the low pressure unit (61) is guided to the distributor (D), condensed by the second water refrigerant heat exchanger (8), and then flows to the second branch liquid pipe (24).

[0204] The refrigerant flowing through the first branch pipe (23) and the refrigerant flowing through the second branch pipe (24) are combined in the common pipe (21) and can flow to the outdoor unit (O).

[0205] The refrigerant passing through the common liquid pipe (21) is expanded by the outdoor expansion valve (25) and flows to the outdoor heat exchanger (2) to be evaporated.

[0206] The refrigerant evaporated in the outdoor heat exchanger (2) is guided to the compressor suction pipe (11) by the first flow switching valve (4), and the refrigerant guided to the compressor suction pipe (11) passes through the accumulator (12a) and is then sucked into the compressor (1).

[0207] Since both the first water-refrigerant heat exchanger (7) and the second water-refrigerant heat exchanger (8) function as condensers, the air conditioner can only produce hot water, and the hot water can be moved to multiple indoor units (I) by the first pump (103) and the second pump (113).

[0208] The first valve (122) and the second valve (123) are turned on or off to supply hot water to multiple indoor units (I), and the three-way valve (121) is controlled to return water passing through the indoor units (I) to the water-refrigerant heat exchanger from which it was initially supplied.

[0209] To control the flow of water, the first valve (122) or the second valve (123) connected to each of the plurality of indoor units (I) of the heating element is opened.

[0210] The three-way valve (121) connected to each indoor unit is controlled so that water passing through the indoor unit with the first valve (122) open can be moved to the first water-refrigerant heat exchanger (7), and the second valve (123) is controlled so that water passing through the indoor unit with the second valve (123) open can be moved to the second water-refrigerant heat exchanger (8).

[0211] Figure 6 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in cooling operation.

[0212] When the cooling load is greater than the heating load, the air conditioner can perform simultaneous operation with cooling operation as the main operation, and the outdoor heat exchanger (2) and the second water-refrigerant heat exchanger (8) can function as a condenser, and the first water-refrigerant heat exchanger (7) can function as an evaporator.

[0213] In order for the outdoor heat exchanger (2) to function as a condenser, the first flow switching valve (4) is turned off, the second flow switching valve (5) is turned on to handle heating of the indoor unit that is a heating unit among the multiple indoor units, and the third flow switching valve (6) is also turned off to handle cooling of the indoor unit that is a cooling unit among the multiple indoor units.

[0214] When the first euro switching valve (4) is turned off, the second euro switching valve (5) is turned on, and the third euro switching valve (6) is turned off, the refrigerant compressed in the compressor (1) can be distributed and flowed to the first water refrigerant heat exchanger (7), the outdoor heat exchanger (2), and the low-pressure engine (61).

[0215] The refrigerant discharged from the compressor (1) flows toward the first flow switching valve (4), the second flow switching valve (5), and the third flow switching valve (6). The refrigerant may be blocked from flowing into the second flow switching valve (5), some of the refrigerant may flow to the outdoor heat exchanger (2) by the first flow switching valve (4), and the remainder of the refrigerant may flow to the low-pressure engine (61) by the third flow switching valve (5).

[0216] The refrigerant flowing into the outdoor heat exchanger (2) is condensed by the outdoor heat exchanger (2) and flows to the distributor (D) through the liquid pipe (21). The refrigerant flowing into the distributor (D) flows to the first branch liquid pipe (23), and while passing through the first branch liquid pipe (23), it is expanded by the first expansion valve (26) and evaporated by the first water refrigerant heat exchanger (7).

[0217] The refrigerant flowing into the low pressure engine (61) flows into the distributor (D), is guided to the second water refrigerant heat exchanger (8), and is condensed by the second water refrigerant heat exchanger (8). The refrigerant condensed by the second water refrigerant heat exchanger (8) passes through the second branch liquid pipe (24), flows into the first branch liquid pipe (23), and is combined with the refrigerant flowing in the outdoor heat exchanger (2).

[0218] The refrigerant evaporated in the first water-coolant heat exchanger (7) passes through the high-pressure engine (51) and is guided to the second flow switching valve (5), and is guided to the compressor suction pipe (11) by the second flow switching valve (5), and after passing through the accumulator (12a), is sucked into the compressor (1).

[0219] Since both the outdoor heat exchanger (7) and the second water-refrigerant heat exchanger (8) function as condensers and the first water-refrigerant heat exchanger (7) functions as an evaporator, the air conditioner can produce cold water by the first water-refrigerant heat exchanger (7) and hot water by the second water-refrigerant heat exchanger (8).

[0220] Cold water can be moved to a cooling indoor unit (I) among the plurality of indoor units (I) by the first pump (103), and hot water can be moved to a heating indoor unit (I) among the plurality of indoor units (I) by the second pump (113).

[0221] The first valve (122) and the second valve (123) are turned on or off to supply cold water or hot water to multiple indoor units (I), and the three-way valve (121) is controlled to return water passing through the indoor unit (I) to the water-refrigerant heat exchanger from which it was initially supplied.

[0222] To control the flow of water, the first valve (122) connected to the indoor unit (I) for cooling can be opened, and the second valve (123) connected to the indoor unit (I) for heating can be opened.

[0223] The three-way valve (121) connected to each indoor unit is controlled so that water passing through the indoor unit with the first valve (122) open can be moved to the first water-refrigerant heat exchanger (7), and the second valve (123) is controlled so that water passing through the indoor unit with the second valve (123) open can be moved to the second water-refrigerant heat exchanger (8).

[0224]

[0225] Fig. 7 is a diagram showing the refrigerant flow when the air conditioner according to the present embodiment is in heating-main operation.

[0226] When the heating load is greater than the cooling load, the air conditioner can perform simultaneous operation with heating operation as the main operation, the second water-refrigerant heat exchanger (8) can function as a condenser, and the outdoor heat exchanger (2) and the first water-refrigerant heat exchanger (7) can function as evaporators.

[0227] In order for the outdoor heat exchanger (2) to function as an evaporator, the first flow switching valve (4) is turned on, the second flow switching valve (5) is turned on to handle cooling of an indoor unit that is a cooling unit among the multiple indoor units, and the third flow switching valve (6) is also turned off to handle heating of an indoor unit that is a heating unit among the multiple indoor units.

[0228] When the first euro switching valve (4) is turned on, the second euro switching valve (5) is turned on, and the third euro switching valve (6) is turned off, the refrigerant compressed in the compressor (1) can flow to the low pressure engine (61).

[0229] The refrigerant discharged from the compressor (1) flows toward the first flow switching valve (4), the second flow switching valve (5), and the third flow switching valve (6). The refrigerant can be blocked from flowing into the first flow switching valve (4) and the second flow switching valve (5), and the refrigerant can flow to the low-pressure engine (61) by the third flow switching valve (6).

[0230] The refrigerant flowing into the low pressure unit (61) flows into the distributor (D), is guided to the second water refrigerant heat exchanger (8), and is condensed by the second water refrigerant heat exchanger (8). After the refrigerant condensed by the second water refrigerant heat exchanger (8) passes through the second branch liquid pipe (24), some of it can flow into the first branch liquid pipe (23), and the remainder can flow into the common liquid pipe (22).

[0231] The refrigerant flowing into the first branch pipe (23) can be expanded by the first expansion valve (26) and evaporated by the first water-refrigerant heat exchanger (7). The refrigerant evaporated by the first water-refrigerant heat exchanger (7) can be guided to the second flow-change valve (5) through the high-pressure engine (51) and can be sucked into the compressor suction pipe (11) by the second flow-change valve (6).

[0232] Meanwhile, the refrigerant flowing from the first branch pipe (23) to the common pipe (22) flows to the outdoor unit (O), can be expanded by the outdoor expansion valve (25), and can be evaporated by the outdoor heat exchanger (2). The refrigerant evaporated by the outdoor heat exchanger (2) can be guided to the first flow switching valve (4), and can be sucked into the compressor suction pipe (11) by the first flow switching valve (4).

[0233] The refrigerant guided to the compressor suction pipe (11) passes through the accumulator (12a) and is then sucked into the compressor (1).

[0234] Since both the outdoor heat exchanger (7) and the first water-refrigerant heat exchanger (7) function as evaporators, and the second water-refrigerant heat exchanger (8) functions as an evaporator, the air conditioner can produce cold water by the first water-refrigerant heat exchanger (7) and hot water by the second water-refrigerant heat exchanger (8).

[0235] Cold water can be moved to a cooling indoor unit (I) among the plurality of indoor units (I) by the first pump (103), and hot water can be moved to a heating indoor unit (I) among the plurality of indoor units (I) by the second pump (113).

[0236] The first valve (122) and the second valve (123) are turned on or off to supply cold water or hot water to multiple indoor units (I), and the three-way valve (121) is controlled to return water passing through the indoor unit (I) to the water-refrigerant heat exchanger from which it was initially supplied.

[0237] To control the flow of water, the first valve (122) connected to the indoor unit (I) for cooling can be opened, and the second valve (123) connected to the indoor unit (I) for heating can be opened.

[0238] The three-way valve (121) connected to each indoor unit is controlled so that water passing through the indoor unit with the first valve (122) open can be moved to the first water-refrigerant heat exchanger (7), and the second valve (123) is controlled so that water passing through the indoor unit with the second valve (123) open can be moved to the second water-refrigerant heat exchanger (8).

[0239] The above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention.

[0240] Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of ​​the present invention but to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments.

[0241] The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A compressor with a compressor suction pipe and a compressor discharge pipe connected; Outdoor heat exchanger with connected liquid and connecting pipes; A first directional valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the connecting pipe; A second directional control valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the high pressure engine; A third flow-through switching valve connected to each of the compressor suction pipe, the compressor discharge pipe, and the low-pressure engine; Expansion valve installed in the above liquid pipe; A first water-refrigerant heat exchanger connected to each of the high pressure engine and the liquid pipe; A second water-coolant heat exchanger connected to each of the above low-pressure engine and liquid pipe; and An air conditioner including a plurality of indoor units each connected to the first water-refrigerant heat exchanger and the second water-refrigerant heat exchanger by water pipes.

2. In paragraph 1, The above compressor suction pipe Common suction pipe with accumulator placed; A first joint pipe connected to the above common suction pipe and the first euro switching valve; A second joint pipe connected to the above common suction pipe and the second euro switching valve; and An air conditioner including a third joint pipe connected to the common suction pipe and the third euro switching valve.

3. In paragraph 1, The above compressor discharge pipe Common discharge pipe with oil separator; A first branch pipe connected to the first euro switching valve; A second branch pipe connected to the above common discharge pipe and the second euro switching valve; and An air conditioner comprising a third branch pipe connected to the common discharge pipe and the third euro switching valve.

4. In paragraph 3, An air conditioner in which one end of the first branch pipe is connected to one of the second branch pipe and the third branch pipe, and the other end of the first branch pipe is connected to the first flow-through switching valve.

5. In paragraph 1, The above liquid pipe common aqueduct; A first branch liquid pipe connected to each of the first water-coolant heat exchanger and the common liquid pipe; and Including a second branch liquid pipe connected to each of the second water-coolant heat exchanger and the common liquid pipe, The above expansion valve An outdoor expansion valve arranged in the above common liquid pipe; A first expansion valve arranged in the first branch pipe; and An air conditioner comprising a second expansion valve arranged in the second branch pipe.

6. In paragraph 1, An air conditioner in which the first euro switching valve is turned off during cooling and guides the refrigerant flowing in from the compressor discharge pipe to the connecting pipe.

7. In paragraph 1, An air conditioner in which the first euro switching valve is turned on during heating and guides the refrigerant flowing in from the connecting pipe to the compressor suction pipe.

8. In paragraph 1, An air conditioner in which the above second euro switching valve is turned on during cooling main operation, cooling only operation, and heating main operation, and guides refrigerant introduced from a high pressure engine to the compressor suction pipe.

9. In paragraph 1, An air conditioner in which the second euro switching valve is turned off during heating-only operation, thereby guiding refrigerant flowing in from the compressor discharge pipe to the high-pressure engine.

10. In paragraph 1, An air conditioner in which the above third-order switching valve is turned off during heating-only operation, cooling-only operation, and heating-only operation, and guides the refrigerant flowing in from the compressor discharge pipe to the low-pressure engine.

11. In paragraph 1, An air conditioner in which the third Euro switching valve is turned on during cooling-only operation and guides refrigerant flowing in from the low-pressure engine to the compressor suction pipe.

12. In paragraph 1, The above water pipe A first inlet pipe and a first outlet pipe connected to the first water-refrigerant heat exchanger; and An air conditioner comprising a second inlet pipe and a second outlet pipe connected to the second water-refrigerant heat exchanger.

13. In paragraph 12, A first pump is placed in the first inlet pipe above, An air conditioner having a second pump arranged in the second inlet pipe.

14. In paragraph 12, It includes a plurality of valve groups arranged in the above water pipe and allowing cold water or hot water to flow, The above valve group is an air conditioner that corresponds 1:1 with the indoor unit.

15. In paragraph 14, Each of the above multiple valve groups A first valve connected to the first outlet pipe; a second valve connected to the second outlet pipe; and Includes a three-way valve connected to each of the outlet pipe of the above indoor unit and the first inlet pipe and the second inlet pipe, The above indoor unit's intake pipe is connected to the first and second valves of the air conditioner.

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