Multi-split system capable of refrigerating and heating simultaneously

Abstract

The utility model discloses a multi-split air conditioning system capable of refrigerating and heating simultaneously, which belongs to the technical field of air conditioners and comprises a compressor. The gas-liquid separator is communicated with the compressor; the multiple indoor heat exchangers communicate with the compressor through first pipelines, and the multiple indoor heat exchangers communicate with the gas-liquid separator through second pipelines; the outdoor heat exchanger is arranged on the first pipeline, and the outdoor heat exchanger communicates with the compressor through the four-way valve; the compressor communicates with the multiple indoor heat exchangers through the pipeline control component; the second ports of the multiple indoor heat exchangers communicate with the compressor through the third pipeline. The indoor heat exchanger can be switched between the refrigerating requirement and the heating requirement by flexibly switching the flow direction of the refrigerant, and the refrigerating mode or the heating mode is adjusted according to the actual environment so as to adapt to different temperature requirements.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a multi-split air conditioning system that can simultaneously cool and heat. Background Technology

[0002] Multi-split air conditioning systems, also known as central air conditioning systems or split-type air conditioning systems, typically refer to a multi-split air conditioning system. This type of system includes a central condenser and multiple indoor units connected together by pipes, sharing the same refrigerant circulation system.

[0003] In most multi-split air conditioners on the market, indoor units within the same refrigerant system can only cool or heat at the same time. In special circumstances, different user groups have different needs for cooling and heating. For example, during transitional seasons, the elderly and children may need heating, while young people tend to prefer cooling, which leads to a mismatch between needs. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a multi-split air conditioning system that can simultaneously cool and heat, enabling the same multi-split air conditioning system to have both cooling and heating indoor units, thereby improving the user experience.

[0005] A multi-split air conditioning system for simultaneous cooling and heating according to an embodiment of the present invention includes a compressor; a gas-liquid separator, the output end of which is connected to the input end of the compressor; multiple indoor heat exchangers, the first ports of which are all connected to the compressor via a first pipeline, and the second ports of which are all connected to the gas-liquid separator via a second pipeline; an outdoor heat exchanger, which is located on the first pipeline and is connected to the compressor via a four-way valve, the four-way valve being used to switch the flow direction of the refrigerant in the circuit; a third pipeline, the second ports of which are all connected to the compressor via a third pipeline; and a pipeline control component, which is connected to the second and third pipelines, and is used to control the second port of a single indoor heat exchanger to connect to the corresponding second pipeline or the corresponding third pipeline, so as to switch the operating mode of the indoor heat exchanger.

[0006] The multi-split air conditioning system for simultaneous cooling and heating according to the embodiments of this utility model has at least the following beneficial effects: By switching the flow direction of the refrigerant through the pipeline control component, when the outdoor heat exchanger is cooling, the condensed low-temperature refrigerant is introduced into the indoor heat exchanger through the first pipeline, so that the indoor heat exchanger with cooling demand enters the cooling mode. The high-temperature refrigerant before condensation is introduced into the indoor heat exchanger through the third pipeline, so that the indoor heat exchanger with heating demand enters the heating mode. When the outdoor heat exchanger is heating, the condensed low-temperature refrigerant is introduced into the indoor heat exchanger, so that the indoor heat exchanger with cooling demand enters the cooling mode. The high-temperature refrigerant before condensation is introduced into the indoor heat exchanger through the third pipeline, so that the indoor heat exchanger with heating demand enters the heating mode. Thus, by flexibly switching the refrigerant flow direction, the indoor heat exchanger can switch between cooling and heating demand, avoiding the simultaneous cooling or heating of all indoor heat exchangers. This allows indoor heat exchangers with both cooling and heating functions to exist in the system at the same time. The system can quickly adjust the cooling or heating mode according to the actual environmental conditions to adapt to different seasons and temperature requirements.

[0007] According to some embodiments of this utility model, the output end of the compressor is connected to the first port of the outdoor heat exchanger through the D and C interfaces of the four-way valve, the second port of the outdoor heat exchanger is connected to the first ports of multiple indoor heat exchangers, and the second port of the indoor heat exchangers is connected to the input end of the gas-liquid separator through a third pipeline.

[0008] According to some embodiments of this utility model, the second port of the indoor heat exchanger is connected to the input end of the compressor via a four-way valve.

[0009] According to some embodiments of the present invention, the pipeline control component includes multiple three-way valves, and each indoor heat exchanger is provided with a corresponding three-way valve. The second pipeline and the third pipeline are connected to the second end of the indoor heat exchanger through the three-way valves.

[0010] According to some embodiments of this utility model, a one-way valve is provided between the C port of the three-way valve and the E port of the four-way valve.

[0011] According to some embodiments of this utility model, an expansion valve is also included, with one expansion valve corresponding to each indoor heat exchanger.

[0012] According to some embodiments of this utility model, the input end of the gas-liquid separator is connected to the S-port of the four-way valve, and the output end of the gas-liquid separator is connected to the suction port of the compressor.

[0013] According to some embodiments of this utility model, the input end of the gas-liquid separator is connected to the C interface of the three-way valve, and the output end of the gas-liquid separator is connected to the input end of the compressor.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioning system that simultaneously cools and heats according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Schematic diagram of the outdoor heat exchanger refrigeration structure;

[0018] Figure 3 for Figure 1 A schematic diagram of the outdoor heat exchanger's heating structure.

[0019] Figure label:

[0020] Compressor 100;

[0021] Gas-liquid separator 200;

[0022] Indoor heat exchanger 300, first pipeline 310, four-way valve 311, second pipeline 320, one-way valve 321, expansion valve 330, second temperature ambient sensing element 340, second fan 350, indoor heat exchanger 1 300a, indoor heat exchanger 2 300b, indoor heat exchanger 300c, indoor heat exchanger 4 300d, indoor heat exchanger 5 300e, indoor heat exchanger 6 300f;

[0023] Outdoor heat exchanger 400, first temperature ambient sensing package 410, first fan 420;

[0024] Third pipeline 500;

[0025] Pipeline control components 600, three-way valve 610. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Any mention of "first" or "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] refer to Figures 1 to 3 This invention describes a multi-split air conditioning system that simultaneously cools and heats according to an embodiment of the present invention.

[0031] like Figures 1 to 3 As shown, the multi-split air conditioning system that simultaneously cools and heats includes a compressor 100; a gas-liquid separator 200, the output of which is connected to the input of the compressor 100; multiple indoor heat exchangers 300, the first ports of which are connected to the compressor 100 via a first pipe 310, and the second ports of which are connected to the gas-liquid separator 200 via a second pipe 320; and an outdoor heat exchanger 400, which is mounted on the first pipe 310 and connected to the compressor 100 via a second pipe 320. The four-way valve 311 is connected to the compressor 100 and is used to switch the flow direction of the refrigerant in the circuit; the third pipe 500 connects the second ports of multiple indoor heat exchangers 300 to the compressor 100; the pipe control component 600 is connected to the second pipe 320 and the third pipe 500 and is used to control the second port of a single indoor heat exchanger to connect to the corresponding second pipe 320 or the corresponding third pipe 500 to switch the operating mode of the indoor heat exchanger 300.

[0032] like Figure 1As shown, multiple indoor heat exchangers 300 are provided, each of which forms a refrigerant flow loop with the compressor 100, gas-liquid separator 200, and outdoor heat exchanger 400. A four-way valve 311 is installed on the first pipeline 310 and connected in series with each indoor heat exchanger 300. The refrigerant discharged from the compressor 100 can be controlled by the four-way valve 311 to achieve refrigerant flow between different paths. A pipeline control component 600 is installed on the loop and connected to all indoor heat exchangers 300. The compressor 100 is connected to multiple indoor heat exchangers 300 through the pipeline control component 600 to control the refrigerant flow among the multiple indoor heat exchangers 300, thereby realizing the switching of the operating modes of the indoor heat exchangers 300. The output end of the compressor 100 is split to the first pipeline 310 and the third pipeline 500. The output end of the compressor 100 can be directly connected to the second port of the indoor heat exchanger 300 through the third pipeline 500.

[0033] The refrigerant flow direction is switched by the pipeline control component 600. When the outdoor heat exchanger 400 is cooling, the condensed low-temperature refrigerant is introduced into the indoor heat exchanger 300 through the first pipeline 310, so that the indoor heat exchanger 300 with cooling demand enters the cooling mode. The high-temperature refrigerant before condensation is introduced into the indoor heat exchanger 300 through the third pipeline 500, so that the indoor heat exchanger 300 with heating demand enters the heating mode. When the outdoor heat exchanger 400 is heating, the condensed low-temperature refrigerant is introduced into the indoor heat exchanger 300, so that the indoor heat exchanger 300 with cooling demand enters the heating mode. When entering cooling mode, the high-temperature refrigerant before condensation is introduced into the indoor heat exchanger 300 through the third pipe 500, so that the indoor heat exchanger 300 with heating demand can enter the heating mode. By flexibly switching the refrigerant flow direction, the indoor heat exchanger 300 can switch between cooling and heating demand, avoiding the simultaneous cooling or heating of all indoor heat exchangers 300. This allows indoor heat exchangers 300 with both cooling and heating functions to exist in the system at the same time. The system can quickly adjust the cooling or heating mode according to the actual environmental conditions to adapt to different seasons and temperature requirements.

[0034] It should be noted that in a conventional system, the four-way valve 311 is equipped with a D port, a C port, an S port, and an E port. The output end of the compressor 100 is connected to the D port of the four-way valve 311. The D port and the C port of the four-way valve 311 are interconnected, so that the compressor 100 is connected to the first port of the outdoor heat exchanger 400. Multiple indoor heat exchangers 300 are connected in parallel on the outdoor heat exchanger 400. The second port of the outdoor heat exchanger 400 is connected to the first port of each indoor heat exchanger 300. The second ports of all indoor heat exchangers 300 are connected to the E port of the four-way valve 311. The E port and the S port of the four-way valve 311 are interconnected, so that all indoor heat exchangers 300 can be connected to the input end of the compressor 100. Taking the cooling mode as an example, when the four-way valve 311 switches to the cooling mode, the output end of the compressor 100 is connected to the first port of the outdoor heat exchanger 400 through the four-way valve 311. The second port of the outdoor heat exchanger 400 is connected to the first ports of multiple indoor heat exchangers 300 respectively. The second port of each indoor heat exchanger 300 is connected to the E interface of the four-way valve 311 and then output through the S interface of the four-way valve 311 to be connected to the input end of the compressor 100. Therefore, the indoor heat exchangers 300 in the same refrigerant system can only cool or heat at the same time. However, in the transitional season, different users have different needs for cooling and heating, resulting in a mismatch between needs.

[0035] It should be noted that the outdoor heat exchanger 400 is equipped with a first temperature environment sensor 410 and a first fan 420, while the indoor heat exchanger 300 is equipped with a second temperature environment sensor 340 and a second fan 350 or 330.

[0036] In some specific embodiments of this utility model, the output end of the compressor 100 is connected to the first port of the outdoor heat exchanger 400 through the D and C interfaces of the four-way valve 311, the second port of the outdoor heat exchanger 400 is connected to the first ports of multiple indoor heat exchangers 300, and the second port of the indoor heat exchangers 300 is connected to the input end of the gas-liquid separator 200 through the third pipeline 500.

[0037] like Figure 1 As shown, the upper and lower ends of the compressor 100 are the output and input ends, respectively; the right and left ends of the outdoor heat exchanger 400 are the first and second ports, respectively; and the upper and lower ends of the indoor heat exchanger 300 are the first and second ports, respectively. Figure 2As shown, when the outdoor heat exchanger 400 is cooling, the high-temperature refrigerant discharged from the output end of the compressor 100 passes through the D and C ports of the four-way valve 311 in sequence, and then enters the outdoor heat exchanger 400 from the first port. The high-temperature refrigerant is cooled down by the outdoor heat exchanger 400 and becomes low-temperature refrigerant. The low-temperature refrigerant is discharged from the second port of the outdoor heat exchanger 400 to the first port of the indoor heat exchanger 300. The low-temperature refrigerant absorbs indoor heat through the indoor heat exchanger 300, and at this time the indoor heat exchanger 300 enters the cooling mode. Subsequently, the refrigerant discharged from the second port of the indoor heat exchanger 300 returns to the input end of the compressor 100 through the pipeline.

[0038] In some specific embodiments of this utility model, the second port of the indoor heat exchanger 300 is connected to the input terminal of the compressor 100 through the E and S interfaces of the four-way valve 311. It should be noted that, as... Figure 2 As shown, the low-temperature refrigerant absorbs indoor heat through the indoor heat exchanger 300 and is discharged from the second port of the indoor heat exchanger 300. The discharged refrigerant passes through the E port and S port of the four-way valve 311 in sequence and returns to the input end of the compressor 100.

[0039] In some specific embodiments of this utility model, multiple three-way valves 610 are provided, with one three-way valve 610 corresponding to each indoor heat exchanger 300. The second pipeline 320 and the third pipeline 500 are connected to the second end of the indoor heat exchanger 300 through the three-way valves 610. Figure 1 As shown, each indoor heat exchanger 300 has a corresponding three-way valve 610 at its second port. The three-way valve 610 has an A port, a B port, and a C port. The B port is connected to the second pipeline 320, and the C port is connected to the third pipeline 500. The indoor heat exchanger 300 is connected to the input end of the compressor 100 through the A port and the C port of the three-way valve 610, so that the low-temperature refrigerant discharged from the outdoor heat exchanger 400 or the indoor heat exchanger 300 flows into the indoor heat exchanger 300. The indoor heat exchanger 300 is connected to the output end of the compressor 100 through the A port and the B port of the three-way valve 610, so that the high-temperature refrigerant discharged from the output end of the compressor 100 flows directly into the indoor heat exchanger 300.

[0040] like Figure 2As shown, when the outdoor heat exchanger 400 is cooling and the indoor heat exchanger 300 is cooling, a portion of the high-temperature refrigerant discharged from the output end of the compressor 100 passes sequentially through the D and C ports of the four-way valve 311 and is then input into the outdoor heat exchanger 400 from the first port. The high-temperature refrigerant is cooled by the outdoor heat exchanger 400 and becomes low-temperature refrigerant. The low-temperature refrigerant is output from the second port of the outdoor heat exchanger 400 to the first port of the indoor heat exchanger 300. After absorbing indoor heat in the indoor heat exchanger 300, the low-temperature refrigerant is discharged from the second port of the indoor heat exchanger 300. The discharged refrigerant passes sequentially through the A and C ports of the three-way valve 610 and connects to the four-way valve 311, and then sequentially through the E and S ports of the four-way valve 311 back to the input end of the compressor 100. It should be noted that a portion of the refrigerant discharged from the port of the indoor heat exchanger 300 can directly return to the input end of the compressor 100 through the pipeline. When the outdoor heat exchanger 400 is heating and the indoor heat exchanger 300 is cooling, the low-temperature refrigerant discharged from the indoor heat exchanger 300 in heating mode is output to the first port of the indoor heat exchanger 300 in cooling mode. After absorbing indoor heat through the indoor heat exchanger 300, the low-temperature refrigerant is discharged from the second port of the indoor heat exchanger 300. The discharged refrigerant passes through the A and C ports of the three-way valve 610 in sequence and returns directly to the input end of the compressor 100 through the pipeline.

[0041] Therefore, when the outdoor heat exchanger 400 is in heating or cooling mode, the low-temperature refrigerant can flow through the three-way valve 610 and the four-way valve 311 through the indoor heat exchanger 300 to absorb heat from the indoor environment, thereby entering the cooling mode.

[0042] like Figure 2As shown, when the outdoor heat exchanger 400 is cooling and the indoor heat exchanger 300 is heating, another portion of the high-temperature refrigerant discharged from the output end of the compressor 100 can directly enter the corresponding indoor heat exchanger 300 through the three-way valve 610. That is, the high-temperature refrigerant discharged from the output end of the compressor 100 flows through the B and A ports of the three-way valve 610 in sequence and flows into the indoor heat exchanger 300 from the second port. The high-temperature refrigerant releases heat to the indoor environment. After heat exchange, the high-temperature refrigerant is cooled down to become low-temperature refrigerant and is output to the indoor heat exchanger 300 in cooling mode. The low-temperature refrigerant absorbs indoor heat through the indoor heat exchanger 300, and then the refrigerant discharged from the second port of the indoor heat exchanger 300 returns to the input end of the compressor 100. When the outdoor heat exchanger 400 is heating and the indoor heat exchanger 300 is heating, all the high-temperature refrigerant discharged from the output end of the compressor 100 can directly enter the corresponding indoor heat exchanger 300 through the three-way valve 610 of the indoor heat exchanger 300. The high-temperature refrigerant releases heat to the indoor environment. After heat exchange, the high-temperature refrigerant is cooled down into low-temperature refrigerant and output to the indoor heat exchanger 300 that has entered the cooling mode. The low-temperature refrigerant absorbs indoor heat through the indoor heat exchanger 300. Then, the refrigerant discharged from the second port of the indoor heat exchanger 300 returns to the input end of the compressor 100.

[0043] Therefore, when the outdoor heat exchanger 400 is in heating or cooling mode, the high-temperature refrigerant can flow through the three-way valve 610 and the four-way valve 311 through the indoor heat exchanger 300 to release heat to the indoor environment, thus entering the heating mode.

[0044] In some specific embodiments of this utility model, a one-way valve 321 is provided between the C port of the three-way valve 610 and the E port of the four-way valve 311.

[0045] like Figure 2As shown, when the outdoor heat exchanger 400 is cooling, the one-way valve 321 enables the second port of the indoor heat exchanger 300, which has entered the cooling mode, to be connected to the E port of the four-way valve 311 through the A and C ports of the three-way valve 610, so that the refrigerant discharged from the indoor heat exchanger 300 can flow through the E and S ports of the four-way valve 311 in sequence, and finally return to the input end of the compressor 100. When the outdoor heat exchanger 400 is heating, the one-way valve 321 prevents the second port of the indoor heat exchanger 300 in cooling mode from being connected to the four-way valve 311. All the high-temperature refrigerant discharged from the output end of the compressor 100 can directly enter the corresponding indoor heat exchanger 300 through the three-way valve 610 of the indoor heat exchanger 300. The low-temperature refrigerant discharged from the indoor heat exchanger 300 in heating mode can flow through the outdoor heat exchanger 400 and the indoor heat exchanger 300 in cooling mode. Thus, the refrigerant discharged from the outdoor heat exchanger 400 returns to the input end of the compressor 100 through the C and S ports of the four-way valve 311, and the refrigerant discharged from the indoor heat exchanger 300 in cooling mode returns directly to the input end of the compressor 100.

[0046] In some specific embodiments of this utility model, the input end of the gas-liquid separator 200 is connected to the S interface of the four-way valve 311, and the output end of the gas-liquid separator 200 is connected to the input end of the compressor 100.

[0047] like Figure 2 As shown, when the outdoor heat exchanger 400 is cooling, the second port of the indoor heat exchanger 300, which has entered the cooling mode, can be connected to the E port of the four-way valve 311 through the A and C ports of the three-way valve 610. The refrigerant discharged from the indoor heat exchanger 300 flows through the E and S ports of the four-way valve 311 in sequence and then connects to the input end of the gas-liquid separator 200. The gas-liquid separator 200 separates the gas and liquid parts in the refrigerant to ensure that only gaseous refrigerant enters the compressor 100 in the cycle.

[0048] In some specific embodiments of this utility model, the input end of the gas-liquid separator 200 is connected to the C interface of the three-way valve 610, and the output end of the gas-liquid separator 200 is connected to the input end of the compressor 100.

[0049] like Figure 3As shown, when the outdoor heat exchanger 400 is heating, the low-temperature refrigerant output from the indoor heat exchanger 300 in heating mode flows through the outdoor heat exchanger 400 and into the indoor heat exchanger 300 in cooling mode. The refrigerant discharged from the outdoor heat exchanger 400 is connected to the input end of the gas-liquid separator 200 through the C and S ports of the four-way valve 311. The refrigerant discharged from the indoor heat exchanger 300 in cooling mode is directly connected to the input end of the gas-liquid separator 200. Thus, the gas-liquid separator 200 separates the gas and liquid parts in the refrigerant to ensure that only gaseous refrigerant enters the compressor 100 in the cycle.

[0050] In some specific embodiments of this utility model, an expansion valve 330 is also included. Each indoor heat exchanger 300 is provided with an expansion valve 330. The expansion valve 330 is located in the circuit. One end of the expansion valve 330 is connected to the outdoor heat exchanger 400, and the other end of the expansion valve 330 is connected to the indoor heat exchanger 300.

[0051] like Figure 1 As shown, each indoor heat exchanger 300 is equipped with an expansion valve 330. The expansion valve 330 is located at the first port of the indoor heat exchanger 300 to control the flow and pressure of the refrigerant in the evaporator, thereby achieving the regulation of pressure, flow rate and temperature, ensuring the efficient operation of the refrigeration system, preventing liquid refrigerant from entering the compressor 100, and providing the required cooling effect.

[0052] The following is an example of... Figure 2 and Figure 3 The two specific embodiments shown illustrate this multi-split air conditioning system that simultaneously cools and heats.

[0053] like Figure 2In the specific embodiment shown, the outdoor heat exchanger 400 is in cooling mode, and three indoor heat exchangers 300 are connected to the outdoor heat exchanger 400. The three indoor heat exchangers 300 are, from top to bottom, No. 1 indoor heat exchanger 300a, No. 2 indoor heat exchanger 300b and No. 3 indoor heat exchanger 300c. In this specific embodiment, No. 1 indoor heat exchanger 300a is in cooling mode, No. 2 indoor heat exchanger 300b is in heating mode, and No. 3 indoor heat exchanger 300c is in cooling mode. Thus, a portion of the high-temperature refrigerant discharged from the output end of the compressor 100 passes sequentially through the D and C ports of the four-way valve 311 and is then input into the outdoor heat exchanger 400 from the first port. The high-temperature refrigerant is cooled down by the outdoor heat exchanger 400 and becomes low-temperature refrigerant. The low-temperature refrigerant is then output from the second port of the outdoor heat exchanger 400 to the first ports of the first indoor heat exchanger 300a and the third indoor heat exchanger 300c, respectively. After absorbing indoor heat in the indoor heat exchanger 300, the low-temperature refrigerant is discharged from the second ports of the first indoor heat exchanger 300a and the third indoor heat exchanger 300c, respectively. The discharged refrigerant passes sequentially through the A and C ports of the three-way valve 610 and connects with the four-way valve 311, and then sequentially returns to the input end of the compressor 100 through the E and S ports of the four-way valve 311.

[0054] Meanwhile, another portion of the high-temperature refrigerant discharged from the output end of the compressor 100 can directly enter the corresponding second indoor heat exchanger 300b through the three-way valve 610 of the indoor heat exchanger 300. That is, the high-temperature refrigerant discharged from the output end of the compressor 100 flows through the B and A ports of the three-way valve 610 in sequence and flows into the second indoor heat exchanger 300b from the second port of the indoor heat exchanger 300. The high-temperature refrigerant releases heat to the indoor environment. After heat exchange, the high-temperature refrigerant is cooled down to become low-temperature refrigerant and is output to the first indoor heat exchanger 300a and the third indoor heat exchanger 300c, which have entered the cooling mode.

[0055] like Figure 3 As shown, the outdoor heat exchanger 400 is in heating mode, and three indoor heat exchangers 300 are connected to it. From top to bottom, the three indoor heat exchangers 300 are designated as indoor heat exchanger 400d, indoor heat exchanger 500e, and indoor heat exchanger 600f. In this specific embodiment, indoor heat exchanger 400d is in cooling mode, indoor heat exchanger 500e is in heating mode, and indoor heat exchanger 600f is in heating mode. Thus, the low-temperature refrigerant discharged from the indoor heat exchanger 300 in heating mode is output to the first port of indoor heat exchanger 400d in cooling mode. After absorbing indoor heat through indoor heat exchanger 300d, the low-temperature refrigerant is discharged from the second port of indoor heat exchanger 300d. The discharged refrigerant passes sequentially through the A and C ports of the three-way valve 610 and returns directly to the input terminal of compressor 100 via a pipeline.

[0056] Meanwhile, all the high-temperature refrigerant discharged from the output end of the compressor 100 can directly enter the No. 5 indoor heat exchanger 300e and the No. 6 indoor heat exchanger 300f through the three-way valve 610. The high-temperature refrigerant releases heat to the indoor environment. After heat exchange, the high-temperature refrigerant is cooled down into low-temperature refrigerant and output to the No. 4 indoor heat exchanger 300d, which is in cooling mode. The low-temperature refrigerant absorbs indoor heat through the No. 4 indoor heat exchanger 300d. Then, the refrigerant discharged from the second port of the indoor heat exchanger 300 returns to the input end of the compressor 100.

[0057] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A multi-split air conditioning system that simultaneously cools and heats, characterized in that, include: Compressor (100); A gas-liquid separator (200) is provided, the output of which is connected to the input of the compressor (100). Multiple indoor heat exchangers (300), the first ports of the multiple indoor heat exchangers (300) are all connected to the compressor (100) through a first pipeline (310), and the second ports of the multiple indoor heat exchangers (300) are all connected to the gas-liquid separator (200) through a second pipeline (320); An outdoor heat exchanger (400) is installed on the first pipeline (310). The outdoor heat exchanger (400) is connected to the compressor (100) through a four-way valve (311). The four-way valve (311) is used to switch the flow direction of the refrigerant in the circuit. The third pipe (500) connects the second ports of the plurality of indoor heat exchangers (300) to the compressor (100). A pipeline control component (600) is connected to the second pipeline (320) and the third pipeline (500). The pipeline control component is used to control the second port of a single indoor heat exchanger to connect with the corresponding second pipeline (320) or the corresponding third pipeline (500) to switch the operating mode of the indoor heat exchanger (300).

2. The multi-split air conditioning system for simultaneous cooling and heating according to claim 1, characterized in that, The output end of the compressor (100) is connected to the first port of the outdoor heat exchanger (400) through the D and C ports of the four-way valve (311). The second port of the outdoor heat exchanger (400) is connected to the first ports of a plurality of indoor heat exchangers (300). The second port of the indoor heat exchanger (300) is connected to the input end of the gas-liquid separator (200) through the third pipeline (500).

3. The multi-split air conditioning system for simultaneous cooling and heating according to claim 1, characterized in that, The second port of the indoor heat exchanger (300) is connected to the input of the compressor (100) through the four-way valve (311).

4. The multi-split air conditioning system for simultaneous cooling and heating according to claim 1, characterized in that, The pipeline control component (600) includes a plurality of three-way valves (610), and each indoor heat exchanger (300) is provided with a corresponding three-way valve (610). The second pipeline (320) and the third pipeline (500) are connected to the second end of the indoor heat exchanger (300) through the three-way valve (610).

5. The multi-split air conditioning system for simultaneous cooling and heating according to claim 4, characterized in that, A check valve (321) is provided between the C port of the three-way valve (610) and the E port of the four-way valve (311).

6. The multi-split air conditioning system for simultaneous cooling and heating according to claim 1, characterized in that, It also includes an expansion valve (330), with one expansion valve (330) provided for each indoor heat exchanger (300).

7. The multi-split air conditioning system for simultaneous cooling and heating according to any one of claims 1 to 5, characterized in that, The input end of the gas-liquid separator (200) is connected to the S interface of the four-way valve (311), and the output end of the gas-liquid separator (200) is connected to the suction port of the compressor (100).

8. The multi-split air conditioning system for simultaneous cooling and heating according to any one of claims 1 to 5, characterized in that, The input end of the gas-liquid separator (200) is connected to the C port of the three-way valve (610), and the output end of the gas-liquid separator (200) is connected to the input end of the compressor (100).

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