Multi-split system, multi-split air conditioner and modification method

Abstract

The present invention provides a multi-split system, a multi-split air conditioner and a modification method, which relate to the field of air conditioning technology. The main purpose is to solve the problems of high cost and long time consumption of air conditioning modification in the prior art, and to provide a multi-split system that is convenient for upgrading and modification. The multi-split system includes a compressor, a heat exchanger and a connecting assembly; the connecting assembly connects the exhaust pipe of the compressor and the inlet pipe of the heat exchanger; the connecting assembly is any one of a connecting pipe, a heat pump refrigerant commutator and a heat exchange refrigerant commutator, and switching the type of the connecting assembly can switch the working principle of the multi-split system. When the system is in use, the components related to the upgrade and modification are independently set, so that they can be replaced as needed, thereby realizing the rapid modification of the multi-split system; in addition, since only the parts with different structures need to be replaced during the modification, the modification cost of the multi-split system can also be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a multi-split system, a multi-split air conditioner and a modification method. Background Art

[0002] Multi-split air conditioners utilize variable capacity control technology and direct refrigerant evaporation and expansion technology. They are popular in the market due to their simple installation, easy maintenance, stability, reliability, and relative environmental friendliness and energy efficiency. Currently, the outdoor condensers of most multi-split air conditioners are air-cooled. While the refrigerant flow path, fin shape, thickness, and pitch, and fan duct have been continuously optimized, air-cooled condensers still have inherent shortcomings compared to other heat exchange media such as water, including low operating efficiency in high-temperature environments. Therefore, the use of multi-split air conditioners still has limitations. Furthermore, there are cases where the air conditioning design of a multi-split air conditioner is insufficient due to changes in the building's intended use, necessitating an upgrade. Consequently, there is a market demand for the retrofit and upgrade of multi-split air conditioners.

[0003] Compared with air source multi-split units, water source multi-split units have the advantages of energy saving, space saving and higher cost performance in long term operation. Therefore, water source multi-split units have a higher market share. The following takes water source multi-split units as an example to illustrate the transformation process: The principle diagram of heat pump air conditioner is as follows: Figure 1 As shown, the principle diagram of heat recovery air conditioning is as follows Figure 2 When two VRF units have essentially the same cooling capacity and configuration, converting them from a heat pump to a heat exchange unit often requires replacing the outdoor unit, significantly increasing the cost and time of the conversion.

[0004] In order to reduce the modification cost of the multi-split system, it is necessary to develop a new multi-split system, multi-split air conditioner and modification method. Summary of the Invention

[0005] The present invention aims to provide a multi-split system, a multi-split air conditioner, and a modification method to address the high cost of air conditioner modification in the prior art. The various technical effects achieved by the preferred technical solutions provided by the present invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a multi-split system, comprising a compressor, a heat exchanger and a connecting assembly; the connecting assembly connects the exhaust pipe of the compressor and the inlet pipe of the heat exchanger;

[0008] The connecting component is any one of a connecting pipe, a heat pump refrigerant commutator and a heat recovery refrigerant commutator. Switching the type of the connecting component can switch the working principle of the multi-split system.

[0009] Compared to traditional VRF systems, VRF systems utilizing heat pump technology offer higher operating efficiency and greater adaptability to the operating environment. Furthermore, VRF systems utilizing heat recovery technology are more energy-efficient than heat pump VRF systems. Because the aforementioned connection components are independently configured, different connection components can be installed or replaced as needed, enabling rapid retrofitting of the VRF system. Furthermore, since retrofitting only requires replacing the structurally different components, the cost of retrofitting the VRF system can be significantly reduced.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] As a further improvement of the present invention, when the connecting assembly is a connecting pipe, the exhaust pipe of the compressor and the inlet pipe of the heat exchanger are connected through the connecting pipe.

[0012] As a further improvement of the present invention, when the connecting component is a heat pump refrigerant commutator, the indoor unit is connected to the air inlet pipe of the compressor via the heat pump refrigerant commutator.

[0013] As a further improvement of the present invention, the heat pump refrigerant reversing device includes a four-way valve;

[0014] The four-way valve is provided with an air pipe and a first connecting pipe, which are respectively connected to the air inlet pipe of the indoor unit and the compressor; the inlet pipe of the heat exchanger and the exhaust pipe of the compressor are also connected through the four-way valve.

[0015] As a further improvement of the present invention, the other end of the indoor unit is connected to the outlet pipe of the heat exchanger.

[0016] As a further improvement of the present invention, a first valve is provided between the indoor unit and the four-way valve.

[0017] As a further improvement of the present invention, the heat pump refrigerant reverser further includes a filter, and the four-way valve is connected to at least one of the compressor, the heat exchanger and the indoor unit respectively through the filter.

[0018] As a further improvement of the present invention, when the connecting component is a heat recovery refrigerant reverser, the multi-split system also includes a mode converter, which is connected to the air inlet of the compressor and the outlet pipe of the heat exchanger through the heat recovery refrigerant reverser.

[0019] As a further improvement of the present invention, the mode converter is provided with a connecting pipe group, and the indoor unit is connected to the mode converter via the connecting pipe group;

[0020] The number of the connecting pipe groups is not less than the number of the indoor units, and the number of the indoor units is at least one.

[0021] As a further improvement of the present invention, the heat recovery refrigerant reversing device includes a main four-way valve, a one-way valve and an auxiliary four-way valve;

[0022] The main four-way valve is connected to the auxiliary four-way valve via a first pipeline. The one-way valve is located in the first pipeline. The first pipeline between the one-way valve and the main four-way valve branches to form a first branch pipeline connected to the exhaust pipe of the compressor. The main four-way valve is connected to the inlet pipe of the heat exchanger via a second pipeline.

[0023] The auxiliary four-way valve is connected to the first pipeline and the high-pressure air pipe, as well as the intake pipe and the low-pressure air pipe of the compressor; the mode converter is connected to the heat recovery refrigerant sensor through the high-pressure air pipe and the low-pressure air pipe;

[0024] The outlet pipe of the heat exchanger is connected to the mode converter.

[0025] As a further improvement of the present invention, the heat recovery refrigerant commutator further includes a first capillary tube and a second capillary tube;

[0026] The low-pressure air pipe and the main four-way valve are connected via a second pipeline, and the first capillary tube is connected to the low-pressure air pipe via the main four-way valve and the second pipeline;

[0027] The low-pressure air pipe and the auxiliary four-way valve are connected through a third pipeline. One end of the second capillary tube is connected to the third pipeline via the auxiliary four-way valve, and the other end is connected to the intake pipe of the compressor via the low-pressure air pipe.

[0028] The present invention also provides a multi-split air conditioner, comprising any of the multi-split systems described above.

[0029] The present invention also provides a method for modifying a multi-connected system as described in any one of the above items, comprising:

[0030] Switch the category of the connection component and adjust the working principle of the multi-connection system.

[0031] As a further improvement of the present invention, it also includes:

[0032] When the connecting component is a connecting pipe, the multi-connected system is a single refrigeration system;

[0033] When the connecting component is a heat pump refrigerant commutator, the multi-split system is a heat pump system;

[0034] When the connecting component is a heat recovery refrigerant commutator, the multi-connected system is a heat exchange system.

[0035] As a further improvement of the present invention, when the connecting component is a heat recovery refrigerant commutator, the indoor unit is connected to the heat recovery refrigerant commutator via a mode converter.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] By separately arranging repetitive and specialized components within various multi-split systems, this invention allows for partial replacement of components during system retrofits, tailored to the specific requirements. Compared to traditional methods of replacing entire outdoor units, this multi-split system is more convenient for upgrading and retrofitting, effectively reducing both retrofit costs and time. Furthermore, this design allows for greater flexibility in retrofitting and assembly, significantly increasing product diversity and options, and enriching its functionality.

[0038] At the same time, this solution is also applicable to the research and development of multi-split system air conditioners, which can greatly reduce the development cost of multi-system air conditioners; at the same time, it also improves the ease of maintenance of the corresponding multi-split system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 It is a schematic diagram of a heat pump multi-connected system in the prior art;

[0041] Figure 2 This is a schematic diagram of a heat recovery multi-connected system in the prior art;

[0042] Figure 3 This is a schematic diagram of the multi-connected system in the present invention in the cooling-only state;

[0043] Figure 4 This is a schematic diagram of the heat pump state of the multi-split system in the present invention;

[0044] Figure 5 This is a schematic diagram of the heat recovery state of the multi-split system in the present invention;

[0045] Figure 6 It is a flow chart of the transformation method of the multi-connected system in the present invention.

[0046] In the figure: 1. Compressor; 11. Exhaust pipe; 12. Inlet pipe; 13. Oil separator; 14. Steam separator; 2. Heat exchanger; 21. Inlet pipe; 22. Outlet pipe; 3. Connecting pipe; 4. Heat pump refrigerant reversing device; 41. Four-way valve; 42. Air pipe; 43. First connecting pipe; 44. First valve; 45. Filter; 5. Heat recovery refrigerant reversing device; 51. Main four-way valve; 52. One-way valve; 53. Auxiliary four-way valve; 54. First pipeline; 541. First branch pipeline; 55. Second pipeline; 551. First capillary tube; 56. High-pressure air pipe; 57. Low-pressure air pipe; 58. Third pipeline; 581. Second capillary tube; 6. Indoor unit; 7. Mode converter; 71. Connecting pipe group; 8. Electronic expansion valve; 9. Liquid receiver; 10. Subcooler. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0049] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0050] The present invention provides a multi-split system, comprising a compressor 1, a heat exchanger 2, and a connecting assembly; the connecting assembly connects the exhaust pipe 11 of the compressor 1 and the inlet pipe 21 of the heat exchanger 2; the connecting assembly is any one of a connecting pipe 3, a heat pump refrigerant commutator 4, and a heat recovery refrigerant commutator. Switching the type of the connecting assembly can switch the operating principle of the multi-split system. Switching the operating principle of the multi-split system also means modifying the multi-split system.

[0051] Compared to traditional VRF systems, VRF systems using heat pump technology offer higher operating efficiency and greater adaptability to the operating environment. Furthermore, VRF systems using heat recovery technology are more energy-efficient than heat pump VRF systems. Because the aforementioned connection components are independently configured, the operating principle of the VRF system can be modified by installing or replacing different connection components as needed, enabling rapid modification and upgrades of the VRF system, reducing modification costs and shortening modification time.

[0052] In actual use, in addition to the above-mentioned structures, the multi-split system may also include an oil separator 13, a steam separator 14, an electronic expansion valve 8, a liquid reservoir 9, a subcooler 10, and other pipes and valves used to implement its functions. The above-mentioned structures are all existing technologies.

[0053] like Figure 3 As shown, the present invention provides a multi-split system, including a compressor 1, a heat exchanger 2 and a connecting assembly made of a connecting pipe 3, where the exhaust pipe 11 of the compressor 1 and the inlet pipe 21 of the heat exchanger 2 are connected through the connecting pipe 3.

[0054] One end of the indoor unit 6 in the multi-split system is connected to the outlet pipe 22 of the heat exchanger 2, and the other end is connected to the air inlet pipe 12 of the compressor 1. At this time, the multi-split system is a single refrigeration machine.

[0055] When it is necessary to transform the cooling-only multi-split system into a heat pump multi-split system:

[0056] The modified multi-connection system is as follows Figure 4 As shown, the connecting pipe 3 is replaced by the heat pump refrigerant commutator 4. The indoor unit 6 is connected to the air inlet pipe 12 of the compressor 1 via the heat pump refrigerant commutator 4. The multi-split system now has cooling or heating functions.

[0057] Specifically, the heat pump refrigerant reversing device 4 can be connected to the exhaust pipe 11 of the outdoor unit, the inlet pipe 21 of the heat exchanger 2 and the steam separator 14 at the same time, and is also connected to the indoor unit; the other end of the indoor unit is connected to the outlet pipe 22 of the heat exchanger 2.

[0058] Specifically, the above-mentioned heat pump refrigerant reversing device 4 includes a four-way valve 41, on which an air pipe 42 and a first connecting pipe 43 are provided. The air pipe 42 and the first connecting pipe 43 are respectively connected to the indoor unit 6 and the air inlet pipe 12 of the compressor 1; the inlet pipe 21 of the heat exchanger 2 and the exhaust pipe 11 of the compressor 1 are also connected through the four-way valve 41.

[0059] Specifically, a steam separator 14 is provided on the air inlet pipe 12 of the compressor 1 , and an oil separator 13 is provided on the exhaust pipe 11 of the compressor 1 .

[0060] As an optional embodiment, a first valve 44 is provided between the indoor unit 6 and the four-way valve 41. The valve is located at the connection between the gas pipe 42 and the indoor unit 6, and the indoor unit 6 can be connected to the indoor unit 6 through the valve.

[0061] In addition, in order to prevent impurities in the pipeline from affecting the normal operation of the system, as an optional implementation, the heat pump refrigerant reverser 4 also includes a filter 45, and the four-way valve 41 is connected to at least one of the compressor 1, the heat exchanger 2 and the indoor unit 6 through the filter 45.

[0062] like Figure 4 As shown, filters 45 are arranged on the four pipes connected to the four-way valve 41.

[0063] by Figure 4 Taking the fluid flow direction drawn in as an example, when the multi-split system is in use, the refrigerant flowing out of the oil separator 13 will flow into the heat exchanger 2 through the four-way valve 41 and flow into the indoor unit after heat exchange treatment in the heat exchanger 2, and finally flow back to the steam separator 14 and the compressor 1 through the four-way valve 41.

[0064] When it is necessary to transform the cooling-only multi-split system into a heat recovery multi-split system:

[0065] The modified multi-connection system is as follows Figure 5 As shown, the connecting pipe 3 is replaced with a heat recovery refrigerant commutator 5. The indoor unit 6 is now connected to the air inlet pipe 12 of the compressor 1 via the heat recovery refrigerant commutator 5. The multi-split system now has cooling, heating and heat recovery functions.

[0066] Specifically, the heat recovery refrigerant reversing device 5 can be simultaneously connected to the exhaust pipe 11 of the outdoor unit, the inlet pipe 21 of the heat exchanger 2 and the steam separator 14, and is also connected to the mode converter 7; the mode converter 7 is also connected to the outlet pipe 22 of the heat exchanger 2.

[0067] Specifically, the mode converter 7 is provided with a connecting pipe group 71, and the indoor unit 6 is connected to the mode converter 7 via the connecting pipe group 71; the number of the connecting pipe groups 71 is not less than the number of the indoor units 6, and the number of the indoor unit 6 is at least one.

[0068] Generally speaking, the number of indoor units 6 is at least two.

[0069] The following combination Figure 5 The structure of the multi-connection system is described as follows:

[0070] Specifically, the heat recovery refrigerant reversing device 5 includes a main four-way valve 51, a one-way valve 52 and an auxiliary four-way valve 53; the main four-way valve 51 is connected to the auxiliary four-way valve 53 through a first pipeline 54, the one-way valve 52 is located in the first pipeline 54, and the first pipeline 54 between the one-way valve 52 and the main four-way valve 51 branches to form a first branch pipeline 541 connected to the exhaust pipe 11 of the compressor 1; the main four-way valve 51 is connected to the inlet pipe 21 of the heat exchanger 2 through a second pipeline 55; the auxiliary four-way valve 53 connects the first pipeline 54 and the high-pressure air pipe 56, as well as the inlet pipe 12 and the low-pressure air pipe 57 of the compressor 1; the mode converter 7 is connected to the heat recovery refrigerant sensor through the high-pressure air pipe 56 and the low-pressure air pipe 57; the outlet pipe 22 of the heat exchanger 2 is connected to the mode converter 7.

[0071] As an optional embodiment, the heat recovery refrigerant reversing device 5 also includes a first capillary tube 551 and a second capillary tube 581; the low-pressure air pipe 57 and the main four-way valve 51 are connected through the second pipeline 55, and the first capillary tube 551 is connected to the low-pressure air pipe 57 through the main four-way valve 51 and the second pipeline 55; the low-pressure air pipe 57 and the auxiliary four-way valve 53 are connected through the third pipeline 58, one end of the second capillary tube 581 is connected to the third pipeline 58 through the auxiliary four-way valve 53, and the other end is connected to the intake pipe 12 of the compressor 1 through the low-pressure air pipe 57.

[0072] The capillary tube can throttle and reduce the pressure of the inflowing refrigerant from a high-pressure state to a low-pressure state.

[0073] In addition, in order to prevent impurities in the pipeline from affecting the normal operation of the system, as an optional embodiment, the heat recovery refrigerant reversing device 5 also includes a filter, and the main four-way valve 51 is connected to at least one of the compressor 1 and the heat exchanger 2 through the filter, and the auxiliary four-way valve 53 is connected to the mode converter 7 and at least one of the compressor 1 through the filter.

[0074] like Figure 5 As shown, at this time, both the low-pressure air pipe 57 and the first pipeline 54 are arranged with filters, and the number of filters on the low-pressure air pipe 57 is two.

[0075] by Figure 5The fluid flow directions shown in the figure are used as an example to illustrate this. At this point, the two indoor units 6 are operating in cooling and heating modes, respectively. When this multi-split system is in use, a portion of the refrigerant flowing out of the oil separator 13 flows through the main four-way valve 51 into the heat exchanger 2 and then through the outlet pipe 22 of the heat exchanger 2 into the mode converter 7. The remaining refrigerant flows through the auxiliary four-way valve 53 and the high-pressure gas pipe 56 into the mode converter 7. Ultimately, heat recovery is achieved through the reversing function within the mode converter 7 (i.e., the condensation heat from the indoor unit 6 operating in the heating mode is transferred to the indoor unit 6 operating in the cooling mode). The remaining cooling and heating principles and refrigerant flow patterns are not further described.

[0076] In the heat recovery state, the heat absorbed by the cooling indoor unit 6 can be transferred to the heating indoor unit, thereby improving the energy efficiency of the equipment. It should be noted that when all indoor units 6 are cooling or heating, the energy efficiency of the heat pump multi-split system and the heat recovery multi-split system is basically the same.

[0077] It should be understood that the above-mentioned heat recovery multi-split system can be modified based on a single refrigeration multi-split system as well as a heat pump multi-split system.

[0078] Compared with the traditional multi-split system, the present invention integrates the structures in the multi-split system that are not related to upgrading and transformation, and independently designs the structures that need to be adjusted and replaced during the upgrading and transformation process, thereby effectively reducing the upgrading and transformation costs of the multi-split system. At the same time, it also makes the multi-split system more flexible during transformation and upgrading, thereby improving the diversity and versatility of the multi-split system.

[0079] The present invention also provides a multi-split air conditioner, comprising any of the multi-split systems described above.

[0080] The present invention also provides a method for modifying a multi-connected system as described in any one of the above items, comprising:

[0081] S1: Switch the category of the connection component to adjust the working principle of the multi-connection system, such as Figure 6 shown.

[0082] After changing the different connected components by switching:

[0083] If the connected component after switching is a connecting pipe, the multi-split system is a single refrigeration system; if the connected component after switching is a heat pump refrigerant reversing device, the multi-split system is a heat pump system; if the connected component after switching is a heat recovery refrigerant reversing device, the multi-split system is a heat exchange system.

[0084] It should be noted that when the connection component is a heat recovery refrigerant reversing device, the indoor unit is connected to the heat recovery refrigerant reversing device through a mode converter.

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A multi-connection system, characterized in that: It includes a compressor, a heat exchanger and a connecting assembly; the connecting assembly connects the exhaust pipe of the compressor and the inlet pipe of the heat exchanger; The connecting component is any one of a connecting pipe, a heat pump refrigerant commutator, and a heat recovery refrigerant commutator. Switching the type of the connecting component can switch the working principle of the multi-split system; When the connecting assembly is a connecting pipe, the exhaust pipe of the compressor and the inlet pipe of the heat exchanger are connected through the connecting pipe; When the connecting component is a heat pump refrigerant reversing device, the indoor unit is connected to the air inlet pipe of the compressor via the heat pump refrigerant reversing device, and the heat pump refrigerant reversing device includes a four-way valve; an air pipe and a first connecting pipe are provided on the four-way valve, and the air pipe and the first connecting pipe are respectively connected to the air inlet pipe of the indoor unit and the compressor; the inlet pipe of the heat exchanger and the exhaust pipe of the compressor are also connected through the four-way valve; When the connection component is a heat recovery refrigerant reverser, the multi-split system further includes a mode converter, and the mode converter is connected to the air inlet of the compressor and the outlet pipe of the heat exchanger via the heat recovery refrigerant reverser.

2. The multi-connection system according to claim 1, characterized in that: The other end of the indoor unit is connected to the outlet pipe of the heat exchanger.

3. The multi-connection system according to claim 1, characterized in that: A first valve is provided between the indoor unit and the four-way valve.

4. The multi-connection system according to claim 1, characterized in that: The heat pump refrigerant reversing device further includes a filter, and the four-way valve is connected to at least one of the compressor, the heat exchanger, and the indoor unit through the filter.

5. The multi-connection system according to claim 1, characterized in that: The mode converter is provided with a connecting pipe group, and the indoor unit is connected to the mode converter via the connecting pipe group; The number of the connecting pipe groups is not less than the number of the indoor units, and the number of the indoor units is at least one.

6. The multi-connection system according to claim 1, characterized in that: The heat recovery refrigerant reversing device includes a main four-way valve, a one-way valve and an auxiliary four-way valve; The main four-way valve is connected to the auxiliary four-way valve through a first pipeline, the one-way valve is located in the first pipeline, and the first pipeline between the one-way valve and the main four-way valve branches to form a first branch pipeline connected to the exhaust pipe of the compressor; The main four-way valve is connected to the inlet pipe of the heat exchanger through a second pipeline; The auxiliary four-way valve is connected to the first pipeline and the high-pressure air pipe, and the air intake pipe and the low-pressure air pipe of the compressor; The mode converter is connected to the heat recovery refrigerant sensor through the high-pressure gas pipe and the low-pressure gas pipe; The outlet pipe of the heat exchanger is connected to the mode converter.

7. The multi-connection system according to claim 6, characterized in that: The heat recovery refrigerant commutator further includes a first capillary tube and a second capillary tube; The low-pressure air pipe and the main four-way valve are connected via a second pipeline, and the first capillary tube is connected to the low-pressure air pipe via the main four-way valve and the second pipeline; The low-pressure air pipe and the auxiliary four-way valve are connected through a third pipeline. One end of the second capillary tube is connected to the third pipeline via the auxiliary four-way valve, and the other end is connected to the intake pipe of the compressor via the low-pressure air pipe.

8. A multi-split air conditioner, characterized in that: A multi-connected system comprising any one of claims 1-7.

9. A method for modifying a multi-connected system according to any one of claims 1 to 7, characterized in that: include: Switch the category of the connection component and adjust the working principle of the multi-connection system.

10. The method for modifying a multi-connected system according to claim 9, characterized in that: Also includes: When the connecting component is a connecting pipe, the multi-connected system is a single refrigeration system; When the connecting component is a heat pump refrigerant commutator, the multi-split system is a heat pump system; When the connecting component is a heat recovery refrigerant commutator, the multi-connected system is a heat exchange system.

11. The method for modifying a multi-connected system according to claim 9, wherein: When the connecting component is a heat recovery refrigerant commutator, the indoor unit is connected to the heat recovery refrigerant commutator via a mode converter.

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