Indoor unit and multi-connected system

Abstract

This application discloses an indoor unit and a multi-split air conditioning system. The indoor unit includes a first indoor heat exchanger, a first indoor throttling device, a first pipe, a second pipe, a second indoor heat exchanger, and a second indoor throttling device. The first pipe and the second pipe are heat exchanged in conjunction. The first end of the first pipe is connected to the outdoor unit via a first pipe, and the other two ends of the first pipe are connected to the first end of the first indoor throttling device. The second end of the first indoor throttling device is connected to the first end of the first indoor heat exchanger, and the second end of the first indoor heat exchanger is connected to the outdoor unit. The first end of the second indoor throttling device is used to connect to the outdoor unit via the first pipe, and the second end of the second indoor throttling device is connected to the first end of the second pipe. The second end of the second pipe is connected to the first end of the second indoor heat exchanger, and the second end of the second indoor heat exchanger is used to connect to the outdoor unit. The indoor unit provided by this application has the advantages of low operating noise and high heat exchange efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, specifically to an indoor unit and a multi-split system. Background Technology

[0002] Multi-split air conditioning systems are widely used in various applications due to their advantages such as energy efficiency, flexible installation, and flexible control. In related technologies, a multi-split system includes an outdoor unit, multiple indoor units, refrigerant piping, and an electronic expansion valve. The refrigerant piping connects the indoor and outdoor units and is responsible for transporting the refrigerant, while the electronic expansion valve is used to evenly distribute the refrigerant flow.

[0003] However, multi-split systems in related technologies suffer from problems such as high noise levels generated when the electronic expansion valve throttles and low heat exchange efficiency in cooling mode. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, embodiments of this disclosure provide an indoor unit that has the advantages of low operating noise and high heat exchange efficiency.

[0006] Embodiments of this disclosure also propose a multi-unit system.

[0007] The indoor unit according to an embodiment of this disclosure includes a first indoor heat exchanger, a first indoor throttling device, a first pipe, a second pipe, a second indoor heat exchanger, and a second indoor throttling device. The first pipe and the second pipe are heat exchanged together. A first end of the first pipe is connected to an outdoor unit via a first pipe. Two ends of the first pipe are connected to the first end of the first indoor throttling device. A second end of the first indoor throttling device is connected to the first end of the first indoor heat exchanger. A second end of the first indoor heat exchanger is connected to the outdoor unit. A first end of the second indoor throttling device is connected to the outdoor unit via the first pipe. A second end of the second indoor throttling device is connected to the first end of the second pipe. A second end of the second pipe is connected to the first end of the second indoor heat exchanger. A second end of the second indoor heat exchanger is connected to the outdoor unit.

[0008] In this embodiment of the indoor unit, during dual cooling mode, the medium-temperature, high-pressure liquid refrigerant from the outdoor unit enters the first pipe. A portion of this refrigerant passes through the first pipe and enters the first indoor heat exchanger to absorb heat, thus achieving heat absorption in the first indoor heat exchanger. The other portion of the medium-temperature, high-pressure liquid refrigerant is throttled by the second indoor throttling device, converting it into a low-temperature, low-pressure refrigerant, which then passes through the second pipe and enters the second indoor heat exchanger to absorb heat, thus achieving cooling in the second indoor heat exchanger. Furthermore, the medium-temperature, high-pressure refrigerant entering the first pipe exchanges heat with the low-temperature, low-pressure refrigerant in the second pipe, increasing its subcooling degree. This results in lower noise generated by the first indoor throttling device when it passes through, leading to a better user experience.

[0009] In some embodiments, the indoor unit further includes a first heat exchanger having a first flow channel and a second flow channel, wherein the first flow channel and the second flow channel are capable of exchanging heat, the first flow channel being connected in series to the first pipeline, and the second flow channel being connected in series to the second pipeline.

[0010] Therefore, the heat exchange requirements between the first and second pipelines can be met, while the procurement and installation of the first heat exchanger are convenient.

[0011] In some embodiments, the indoor unit further includes a third pipe and a fourth pipe, the third pipe and the fourth pipe being heat exchanged together, the second end of the first indoor throttling component being connected to the first end of the first indoor heat exchanger through the third pipe, and the first pipe being connected to the first end of the second indoor throttling component through the fourth pipe.

[0012] Therefore, in dual cooling mode, the refrigerant in the third pipe is a low-temperature, low-pressure refrigerant, while the refrigerant in the fourth pipe is a medium-temperature, high-pressure refrigerant. At this time, the heat exchange between the two refrigerants in the third and fourth pipes increases the subcooling of the refrigerant located between the fourth pipe and the second indoor throttling device, so that the noise generated by the second indoor throttling device is less when it passes through the second indoor throttling device, resulting in a better user experience.

[0013] In some embodiments, the indoor unit further includes a second heat exchanger having a third flow channel and a fourth flow channel, wherein the third flow channel and the fourth flow channel are capable of exchanging heat, the third flow channel being connected in series to the third pipe, and the fourth flow channel being connected in series to the fourth pipe.

[0014] Therefore, the heat exchange requirements between the third and fourth pipelines can be met, while the procurement and installation of the second heat exchanger are convenient.

[0015] In some embodiments, the indoor unit further includes a fifth pipe and a sixth pipe, the fifth pipe and the sixth pipe being heat exchanged together, the first pipe being connected to a first end of the first pipe through the fifth pipe, and the second end of the first indoor throttling component being connected to a first end of the first indoor heat exchanger through the sixth pipe.

[0016] Therefore, in dual-cooling mode, the refrigerant in the fifth pipe is a medium-temperature, high-pressure refrigerant, while the refrigerant in the sixth pipe is a low-temperature, low-pressure refrigerant. The heat exchange between the two refrigerants in the fifth and sixth pipes increases the subcooling of the refrigerant located between the fifth and second pipes. This allows the subcooling to be further increased after passing through the second pipe and interacting with the low-temperature, low-pressure refrigerant in the first pipe. Consequently, the noise generated by the first indoor throttling device when this portion of the refrigerant passes through it is further reduced, resulting in a better user experience.

[0017] Meanwhile, in constant temperature and dehumidification mode, the refrigerant in the second pipeline is a medium-temperature and high-pressure refrigerant that has been heated by the second indoor heat exchanger. On this basis, the heat exchange between the fifth and sixth pipelines increases the subcooling of the refrigerant upstream of the first indoor throttling component, which also has the effect of reducing the operating noise of the first indoor throttling component.

[0018] In some embodiments, the indoor unit further includes a third heat exchanger having a fifth flow channel and a sixth flow channel, wherein the fifth flow channel and the sixth flow channel are capable of heat exchange, the fifth flow channel being connected in series to the fifth pipe, and the sixth flow channel being connected in series to the sixth pipe.

[0019] Therefore, the heat exchange requirements between the fifth and sixth pipelines can be met, while the procurement and installation of the third heat exchanger are convenient.

[0020] In some embodiments, the heat exchange area of ​​the first indoor heat exchanger is larger than the heat exchange area of ​​the second indoor heat exchanger.

[0021] Therefore, in dual-cooling mode, the low-temperature, low-pressure refrigerant passing through the second indoor throttling device experiences less heat exchange when passing through the second indoor heat exchanger, and the refrigerant cannot be completely converted into a gaseous state. By exchanging heat between this portion of the refrigerant and the medium-temperature, high-pressure refrigerant in the first pipeline, the effective utilization of the cooling capacity of this portion of the refrigerant is improved, effectively avoiding waste of cooling capacity and the return of liquid refrigerant to the compressor. The indoor unit has high heat exchange efficiency and high operational reliability.

[0022] In some embodiments, the first indoor heat exchanger and the second indoor heat exchanger are arranged adjacent to each other, and the indoor unit further includes a first fan, which is located on the side of the first indoor heat exchanger away from the second indoor heat exchanger and is used to blow air toward the first indoor heat exchanger.

[0023] Therefore, a single first fan can achieve heat exchange between the first and second indoor heat exchangers and the indoor air. The indoor unit has low cost, compact structure, and small space occupation. Moreover, in constant temperature dehumidification mode, while the first indoor heat exchanger dehumidifies, the cool air formed by heat exchange with it is blown by the first fan to the second indoor heat exchanger to exchange heat with it to form air that is basically the same as the room temperature, thus making the indoor temperature maintenance more reliable.

[0024] In some embodiments, the second end of the first indoor heat exchanger is used to connect to the compressor of the outdoor unit via a second pipe, and the second end of the second indoor heat exchanger is used to connect to the compressor via a third pipe.

[0025] Therefore, while one of the first and second indoor heat exchangers is cooling, the other is simultaneously heating, achieving both cooling and heating as well as constant temperature dehumidification, thus enhancing functionality. Furthermore, when multiple indoor units are used, independent cooling, heating, and dehumidification functions can be applied to different rooms simultaneously, offering high flexibility.

[0026] In some embodiments, the indoor unit further includes a first connecting pipe, a first end of which is connected to a first end of the first pipe, a second end of which is connected to a first end of the second indoor throttling component, and the first pipe is connected to the middle portion of the first connecting pipe located between the first end and the second end.

[0027] Therefore, the first end of the first pipeline, the first end of the second indoor throttling component, and the first pipeline are easily connected to each other, the pipeline layout is simple and flexible, and the assembly efficiency of the multi-split system is high.

[0028] The multi-split air conditioning system of this invention includes an outdoor unit and an indoor unit as described in any of the above embodiments.

[0029] The technical advantages of the multi-split air conditioning system in this embodiment are the same as those of the indoor unit in the above embodiments, and will not be repeated here.

[0030] In some embodiments, there are multiple indoor units. In any one of the indoor units, the first end of the first pipe is connected to the outdoor unit through the first pipe, the second end of the first indoor heat exchanger is connected to the outdoor unit, and the second end of the second indoor heat exchanger is connected to the outdoor unit.

[0031] Therefore, multiple indoor units can be arranged in different rooms to provide functions such as temperature control and dehumidification for different rooms, and the mode selection of indoor units in different rooms can be adjusted independently, making the multi-split system highly functional.

[0032] In some embodiments, the outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor throttling component, a first reversing assembly, and a second reversing assembly.

[0033] The first reversing component has a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, and the second reversing component has a first inlet / outlet, a second inlet / outlet and a third inlet / outlet; The first connecting port and the first inlet / outlet are respectively connected to the outlet of the compressor, and the third connecting port and the third inlet / outlet are respectively connected to the inlet of the compressor; The second connection port is connected to the first end of the outdoor heat exchanger, the second end of the outdoor heat exchanger is connected to the first end of the outdoor throttling component, the second end of the outdoor throttling component is connected to the first pipe, the fourth connection port is connected to the second end of the first indoor heat exchanger through the second pipe, and the second inlet and outlet are connected to the second end of the second indoor heat exchanger through the third pipe.

[0034] Therefore, by controlling the on / off state of at least one of the first and second connecting ports, the first and fourth connecting ports, the third and fourth connecting ports, the first and second inlet / outlet, the second and third inlet / outlet, and / or controlling the opening and closing state of the outdoor throttling component, the first indoor throttling component, and the second indoor throttling component, the multi-split system can achieve cooling, heating, and constant temperature dehumidification functions. The piping layout is simple, the installation cost is low, and the multi-split system has stronger functionality.

[0035] In some embodiments, the outdoor unit further includes a gas-liquid separator, the third connection port and the third inlet / outlet are respectively connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the inlet of the compressor.

[0036] Therefore, in any mode, the refrigerant must first pass through a gas-liquid separator for gas-liquid separation, so that only gaseous refrigerant enters the compressor, effectively preventing the compressor from being liquid-damped and reducing its service life.

[0037] In some embodiments, the multi-split system has a cooling mode, in which the first and second connecting ports are connected, the third and fourth connecting ports are connected, the second inlet and outlet are connected, and the third inlet and outlet are connected; and the first indoor throttling component, the second indoor throttling component, and the outdoor throttling component are all open; and / or, The multi-split air conditioning system has a heating mode in which the first and fourth connecting ports are connected, the second and third connecting ports are connected, the first and second inlet / outlet ports are connected, and the first indoor throttling component, the second indoor throttling component, and the outdoor throttling component are all open; and / or, The multi-split air conditioning system has a constant temperature dehumidification mode. In this mode, the first and second connecting ports are connected, the third and fourth connecting ports are connected, the first and second inlet / outlet are connected, and the first indoor throttling component, the second indoor throttling component, and the outdoor throttling component are all open.

[0038] Therefore, multi-split systems can flexibly adopt functions such as cooling, heating, and constant temperature dehumidification in different environments to meet the user experience, and the piping layout is simple, the installation cost is low, and the functionality of multi-split systems is stronger.

[0039] In some embodiments, in the cooling mode, the first indoor throttling component is in a throttling state, the second indoor throttling component is in a throttling state, and the outdoor throttling component is in a fully open state; In the heating mode, the first indoor throttling component is fully open, the second indoor throttling component is fully open, and the outdoor throttling component is in a throttling state; In the constant temperature dehumidification mode, the first indoor throttling component is in the fully open state, the second indoor throttling component is in the throttling state, and the outdoor throttling component is in the throttling state.

[0040] Therefore, by controlling the opening states of the first indoor throttling component, the second indoor throttling component, and the outdoor throttling component in different modes, it is effectively ensured that the refrigerant flowing in the pipes connecting the indoor and outdoor units is in a superheated gaseous or subcooled liquid state, rather than being transported in a two-phase state. As a result, the noise generated during the transportation process is lower, the heat exchange with the outside is lower, and the energy consumption is lower. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a multi-unit system according to an embodiment of the present disclosure.

[0042] Figure 2 This is another schematic diagram of a multi-unit system according to an embodiment of the present disclosure.

[0043] Figure 3 This is yet another schematic diagram of a multi-unit system according to an embodiment of the present disclosure.

[0044] Figure 4 This is another schematic diagram of a multi-unit system according to an embodiment of the present disclosure.

[0045] Figure label: 1. Indoor unit; 11. First indoor heat exchanger; 12. First indoor throttling device; 13. First heat exchanger; 131. First pipeline; 132. Second pipeline; 14. Second indoor heat exchanger; 15. Second indoor throttling device; 16. Second heat exchanger; 161. Third pipeline; 162. Fourth pipeline; 17. Third heat exchanger; 171. Fifth pipeline; 172. Sixth pipeline; 18. First pipe; 19. Second pipe; 110. Third pipe; 2. Outdoor unit; 21. Compressor; 22. Gas-liquid separator; 23. Outdoor heat exchanger; 24. Outdoor throttling device; 25. First reversing assembly; 26. Second reversing assembly. Detailed Implementation

[0046] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.

[0047] The following is combined with Figures 1-4 A multi-unit system according to embodiments of the present disclosure is described.

[0048] The indoor unit 1 of this embodiment includes a first indoor heat exchanger 11, a first indoor throttling component 12, a first pipe 131, a second pipe 132, a second indoor heat exchanger 14, and a second indoor throttling component 15. The first pipe 131 and the second pipe 132 are heat exchanged together. The first end of the first pipe 131 is connected to the outdoor unit 2 via a first pipe 18. The two ends of the first pipe 131 are connected to the first ends of the first indoor throttling component 12. The second end of the first indoor throttling component 12 is connected to the first end of the first indoor heat exchanger 11, and the second end of the first indoor heat exchanger 11 is connected to the outdoor unit 2. The first end of the second indoor throttling component 15 is connected to the outdoor unit 2 via the first pipe 18. The second end of the second indoor throttling component 15 is connected to the first end of the second pipe 132. The second end of the second pipe 132 is connected to the first end of the second indoor heat exchanger 14, and the second end of the second indoor heat exchanger 14 is connected to the outdoor unit 2.

[0049] In this embodiment of the present disclosure, when the indoor unit 1 is in dual cooling mode, the medium-temperature, high-pressure liquid refrigerant from the outdoor unit 2 enters the first pipe 18. A portion of the medium-temperature, high-pressure liquid refrigerant passes through the first pipe 131 and enters the first indoor heat exchanger 11 to absorb heat, thus achieving heat absorption in the first indoor heat exchanger 11. The other portion of the medium-temperature, high-pressure liquid refrigerant is throttled by the second indoor throttling device 15, converted into low-temperature, low-pressure refrigerant, and then enters the second indoor heat exchanger 14 through the second pipe 132 to absorb heat, thus achieving cooling in the second indoor heat exchanger 14. Furthermore, the medium-temperature, high-pressure refrigerant entering the first pipe 131 exchanges heat with the low-temperature, low-pressure refrigerant in the second pipe 132, increasing its refrigerant subcooling. This results in lower noise generated by the first indoor throttling device 12 when it passes through the first indoor throttling device 12, leading to a better user experience.

[0050] It should be noted that the first indoor throttling component 12 and the second indoor throttling component 15 are electronic expansion valves, and the second indoor heat exchanger 14 can be flexibly used as an evaporator and condenser according to the working mode of the multi-split system. The indoor unit 1 is equipped with a first indoor heat exchanger 11 and a second indoor heat exchanger 14, which are mainly used to ensure that it has a constant temperature dehumidification mode in winter. In the constant temperature dehumidification mode, the first indoor heat exchanger 11 is used for cooling, and the second indoor heat exchanger 14 is used for heating. At this time, the heat exchange efficiency requirement of the second indoor heat exchanger 14 is relatively low. Therefore, the opening of the corresponding second indoor throttling component 15 is smaller, and the noise it emits is relatively low, so there is basically no need to perform noise reduction treatment.

[0051] In some embodiments, the indoor unit 1 further includes a first heat exchanger 13, the first heat exchanger 13 having a first flow channel and a second flow channel, the first flow channel and the second flow channel being able to exchange heat, the first flow channel being connected in series to a first pipe 131, and the second flow channel being connected in series to a second pipe 132.

[0052] Therefore, the heat exchange requirements between the first pipeline 131 and the second pipeline 132 can be met, while the procurement and installation of the first heat exchanger 13 are convenient.

[0053] Alternatively, heat exchange can be achieved by means of intertwining or parallel contact between the first pipe 131 and the second pipe 132.

[0054] In some embodiments, such as Figure 2 As shown, the indoor unit 1 also includes a third pipe 161 and a fourth pipe 162. The third pipe 161 and the fourth pipe 162 are heat exchanged together. The second end of the first indoor throttling component 12 is connected to the first end of the first indoor heat exchanger 11 through the third pipe 161. The first pipe 18 is connected to the first end of the second indoor throttling component 15 through the fourth pipe 162.

[0055] At this time, in the dual cooling mode, the refrigerant passing through the third pipe 161 is a low-temperature, low-pressure refrigerant, and the refrigerant passing through the fourth pipe 162 is a medium-temperature, high-pressure refrigerant. The heat exchange between the two refrigerants between the third pipe 161 and the fourth pipe 162 increases the subcooling of the refrigerant located between the fourth pipe 162 and the second indoor throttling component 15, so that the noise generated by the second indoor throttling component 15 is less when it passes through the second indoor throttling component 15, resulting in a better user experience.

[0056] In some embodiments, the indoor unit 1 further includes a second heat exchanger 16, which has a third flow channel and a fourth flow channel. The third flow channel and the fourth flow channel can exchange heat. The third flow channel is connected in series to a third pipe 161, and the fourth flow channel is connected in series to a fourth pipe 162.

[0057] Therefore, the heat exchange requirements between the third pipeline 161 and the fourth pipeline 162 can be met, while the procurement and installation of the second heat exchanger 16 are convenient.

[0058] Alternatively, heat exchange can be achieved by the third pipe 161 and the fourth pipe 162 through methods such as intertwining or side-by-side contact.

[0059] In some embodiments, such as Figure 3 As shown, the indoor unit 1 also includes a fifth pipe 171 and a sixth pipe 172. The fifth pipe 171 and the sixth pipe 172 are heat exchanged together. The first pipe 18 is connected to the first end of the first pipe 131 through the fifth pipe 171. The second end of the first indoor throttling component 12 is connected to the first end of the first indoor heat exchanger 11 through the sixth pipe 172.

[0060] At this time, in the dual cooling mode, the refrigerant in the fifth pipe 171 is a medium-temperature, high-pressure refrigerant, and the refrigerant in the sixth pipe 172 is a low-temperature, low-pressure refrigerant. The heat exchange between the two refrigerants in the fifth pipe 171 and the sixth pipe 172 increases the subcooling of the refrigerant located between the fifth pipe 171 and the second pipe 132. This allows the subcooling to be further increased after passing through the second pipe 132 and interacting with the low-temperature, low-pressure refrigerant in the first pipe 131. This further reduces the noise generated by the first indoor throttling device 12 when this part of the refrigerant passes through it, resulting in a better user experience.

[0061] Meanwhile, in constant temperature and dehumidification mode, that is, the refrigerant in the second pipe 132 is a medium-temperature and high-pressure refrigerant after the heat is released by the second indoor heat exchanger 14. On this basis, the heat exchange between the fifth pipe 171 and the sixth pipe 172 improves the refrigerant subcooling upstream of the first indoor throttling component 12, which also has the effect of reducing the operating noise of the first indoor throttling component 12.

[0062] In some embodiments, the indoor unit 1 further includes a third heat exchanger 17, which has a fifth flow channel and a sixth flow channel. The fifth flow channel and the sixth flow channel can exchange heat. The fifth flow channel is connected in series to a fifth pipe 171, and the sixth flow channel is connected in series to a sixth pipe 172.

[0063] Therefore, the heat exchange requirements between the fifth pipeline 171 and the sixth pipeline 172 can be met, while the procurement and installation of the third heat exchanger 17 are convenient.

[0064] Alternatively, the fifth pipe 171 and the sixth pipe 172 can also achieve heat exchange by intertwining or side-by-side contact.

[0065] In some embodiments, the heat exchange area of ​​the first indoor heat exchanger 11 is greater than the heat exchange area of ​​the second indoor heat exchanger 14.

[0066] Therefore, in dual-cooling mode, the low-temperature, low-pressure refrigerant passing through the second indoor throttling component 15 experiences less heat exchange when passing through the second indoor heat exchanger 14, and the refrigerant cannot be completely converted into a gaseous state. By exchanging heat between this portion of the refrigerant and the medium-temperature, high-pressure refrigerant in the first pipeline 131, the effective utilization of the cooling capacity of this portion of the refrigerant is improved, effectively avoiding the waste of cooling capacity and the return of liquid refrigerant to the compressor 21. The indoor unit 1 has high heat exchange efficiency and high operational reliability.

[0067] In some embodiments, such as Figures 1-3 As shown, the first indoor heat exchanger 11 and the second indoor heat exchanger 14 are arranged adjacent to each other. The indoor unit 1 also includes a first fan, which is located on the side of the first indoor heat exchanger 11 away from the second indoor heat exchanger 14 and is used to blow air toward the first indoor heat exchanger 11.

[0068] In other words, a single first fan can achieve heat exchange between the first indoor heat exchanger 11 and the second indoor heat exchanger 14 and the indoor air. The indoor unit 1 has low cost, compact structure, and small space occupation. Moreover, in constant temperature dehumidification mode, while the first indoor heat exchanger 11 dehumidifies, the cool air formed by heat exchange with it is blown by the first fan to the second indoor heat exchanger 14 to exchange heat with it to form air that is basically the same as the room temperature, thus making the indoor constant temperature maintenance more reliable.

[0069] In some embodiments, such as Figures 1-3 As shown, the second end of the first indoor heat exchanger 11 is used to connect to the compressor 21 of the outdoor unit 2 through the second pipe 19, and the second end of the second indoor heat exchanger 14 is used to connect to the compressor 21 through the third pipe 110.

[0070] Therefore, while one of the first indoor heat exchanger 11 and the second indoor heat exchanger 14 is cooling, the other is simultaneously heating, which means that cooling and heating can be achieved at the same time as constant temperature dehumidification, making it more functional. Moreover, when there are multiple indoor units 1, independent cooling, heating and dehumidification functions can be achieved for different rooms at the same time, which is highly flexible.

[0071] In some embodiments, the indoor unit 1 further includes a first connecting pipe, the first end of which is connected to the first end of the first pipe 131, the second end of which is connected to the first end of the second indoor throttling component 15, and the first pipe 18 is connected to the middle portion of the first connecting pipe located between the first end and the second end.

[0072] Therefore, the first end of the first pipe 131, the first end of the second indoor throttling component 15, and the first pipe 18 are easily connected to each other, the pipe layout is simple and flexible, and the assembly efficiency of the multi-split system is high.

[0073] The multi-split air conditioning system of this invention includes an outdoor unit 2 and an indoor unit 1 as described in any of the above embodiments.

[0074] The technical advantages of the multi-split air conditioning system in this embodiment are the same as those of the indoor unit 1 in the above embodiment, and will not be repeated here.

[0075] In some embodiments, such as Figure 4 As shown, there are multiple indoor units 1. In any one indoor unit 1, the first end of the first pipe 131 is connected to the outdoor unit 2 through the first pipe 18, the second end of the first indoor heat exchanger 11 is connected to the outdoor unit 2, and the second end of the second indoor heat exchanger 14 is connected to the outdoor unit 2. That is, multiple indoor units 1 are connected in parallel.

[0076] Therefore, multiple indoor units 1 can be arranged in different rooms to provide functions such as temperature control and dehumidification for different rooms, and the mode selection of indoor units 1 in different rooms can be adjusted independently, making the multi-split system highly functional.

[0077] In some embodiments, the outdoor unit 2 includes a compressor 21, an outdoor heat exchanger 23, an outdoor throttling component 24, a first reversing assembly 25, and a second reversing assembly 26. The first reversing assembly 25 has a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port. The second reversing assembly 26 has a first inlet / outlet, a second inlet / outlet, and a third inlet / outlet. The first connecting port and the first inlet / outlet are respectively connected to the outlet of the compressor 21, and the third connecting port and the third inlet / outlet are respectively connected to the inlet of the compressor 21. The second connecting port is connected to the first end of the outdoor heat exchanger 23, the second end of the outdoor heat exchanger 23 is connected to the first end of the outdoor throttling component 24, the second end of the outdoor throttling component 24 is connected to the first pipe 18, the fourth connecting port is connected to the second end of the first indoor heat exchanger 11 through the second pipe 19, and the second inlet / outlet is connected to the second end of the second indoor heat exchanger 14 through the third pipe 110.

[0078] Therefore, by controlling the on / off state of at least one of the first and second connecting ports, the first and fourth connecting ports, the third and fourth connecting ports, the first and second inlet / outlet, the second and third inlet / outlet, and / or controlling the opening and closing states of the outdoor throttling component 24, the first indoor throttling component 12, and the second indoor throttling component 15, the multi-split system can achieve cooling, heating, and constant temperature dehumidification functions. The piping layout is simple, the installation cost is low, and the multi-split system has stronger functionality.

[0079] For example, such as Figures 1-3 As shown, the first reversing assembly 25 includes a four-way valve with ports D, S, C, and E. Port D of the four-way valve forms a first communication port, port S forms a third communication port, port C forms a second communication port, and port E forms a fourth communication port. The second reversing assembly 26 includes a three-way valve with ports P, A, and B. Port P of the three-way valve forms a second inlet / outlet, port A forms a first inlet / outlet, and port B forms a third inlet / outlet.

[0080] It should be noted that the outdoor throttling component 24 is an electronic expansion valve, and the outdoor heat exchanger 23 can be flexibly used as an evaporator and condenser according to the working mode of the multi-split system.

[0081] In some embodiments, the outdoor unit 2 further includes a gas-liquid separator 22, a third connection port and a third inlet / outlet are connected to the inlet of the gas-liquid separator 22 respectively, and the outlet of the gas-liquid separator 22 is connected to the inlet of the compressor 21.

[0082] In any mode, the refrigerant must first pass through the gas-liquid separator 22 for gas-liquid separation, so that only gaseous refrigerant enters the compressor 21, effectively preventing the compressor 21 from being liquid-damped and reducing its service life.

[0083] In some embodiments, the multi-split system has a cooling mode, in which the first and second connecting ports are connected, the third and fourth connecting ports are connected, the second and third inlet / outlet are connected, and the first indoor throttling component 12, the second indoor throttling component 15, and the outdoor throttling component 24 are all open. And / or, the multi-split system has a heating mode, in which the first and fourth connecting ports are connected, the second and third connecting ports are connected, the first and second inlet / outlet are connected, and the first indoor throttling component 12, the second indoor throttling component 15, and the outdoor throttling component 24 are all open. And / or, the multi-split system has a constant temperature dehumidification mode, in which the first and second connecting ports are connected, the third and fourth connecting ports are connected, the first and second inlet / outlet are connected, and the first indoor throttling component 12, the second indoor throttling component 15, and the outdoor throttling component 24 are all open.

[0084] Therefore, multi-split systems can flexibly adopt functions such as cooling, heating, and constant temperature dehumidification in different environments to meet the user experience, and the piping layout is simple, the installation cost is low, and the functionality of multi-split systems is stronger.

[0085] For example, in cooling mode, the refrigerant flowing out of the compressor 21 passes sequentially through the first connection port, the second connection port, the outdoor heat exchanger 23, and the outdoor throttling device 24 into the first pipe 18. The refrigerant in the first pipe 18 is divided into two paths. One path of refrigerant passes sequentially through the first pipe 131, the first indoor throttling device 12, and the first indoor heat exchanger 11. The other path of refrigerant passes sequentially through the second indoor throttling device 15, the second pipe 132, and the second indoor heat exchanger 14. The refrigerant flowing out of the first indoor heat exchanger 11 flows back to the compressor 21 through the second pipe 19, the fourth connection port, and the third connection port. The refrigerant flowing out of the second indoor heat exchanger 14 flows back to the compressor 21 through the third pipe 110, the first inlet and outlet, and the third inlet and outlet.

[0086] In heating mode, the refrigerant flowing out of the compressor 21 is divided into two paths. One path of refrigerant passes through the first connecting port, the fourth connecting port, the second pipe 19, the first indoor heat exchanger 11, the first indoor throttling device 12, and the first pipe 131 in sequence to enter the first pipe 18. The other path of refrigerant passes through the first inlet and outlet, the second inlet and outlet, the third pipe 110, the second indoor heat exchanger 14, the second pipe 132, and the second indoor throttling device 15 in sequence to enter the first pipe 18. The refrigerant in the first pipe 18 passes through the outdoor throttling device 24, the outdoor heat exchanger 23, the second connecting port, and the third connecting port in sequence to return to the compressor 21.

[0087] In constant temperature and dehumidification mode, the refrigerant flowing out of the compressor 21 outlet is divided into two paths. One path of refrigerant passes through the first connecting port, the second connecting port, the outdoor heat exchanger 23, and the outdoor throttling component 24 in sequence and enters the first pipe 18. The other path of refrigerant passes through the first inlet and outlet, the second inlet and outlet, the third pipe 110, the second indoor heat exchanger 14, the second pipe 132, and the second indoor throttling component 15 in sequence. The refrigerant in the first pipe 18 and the refrigerant passing through the second indoor throttling component 15 both pass through the first pipe 131, the first indoor throttling component 12, and the first indoor heat exchanger 11 in sequence. The refrigerant flowing out of the first indoor heat exchanger 11 returns to the compressor 21 through the second pipe 19, the fourth connecting port, and the third connecting port.

[0088] In some embodiments, in cooling mode, the first indoor throttling component 12 is in a throttling state, the second indoor throttling component 15 is in a throttling state, and the outdoor throttling component 24 is in a fully open state. In heating mode, the first indoor throttling component 12 is in a fully open state, the second indoor throttling component 15 is in a fully open state, and the outdoor throttling component 24 is in a throttling state. In constant temperature dehumidification mode, the first indoor throttling component 12 is in a fully open state, the second indoor throttling component 15 is in a throttling state, and the outdoor throttling component 24 is in a throttling state.

[0089] Therefore, by controlling the opening states of the first indoor throttling component 12, the second indoor throttling component 15, and the outdoor throttling component 24 in different modes, it is effectively ensured that the refrigerant flowing in the pipe connecting the indoor unit 1 and the outdoor unit 2 is in a superheated gaseous state or a supercooled liquid state, rather than being transported in a two-phase state. As a result, the noise generated during the transportation process is lower, the heat exchange with the outside is lower, and the energy consumption is lower.

[0090] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to 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 disclosure.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0093] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0094] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0095] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An indoor unit, characterized in that, include: The system comprises a first indoor heat exchanger (11), a first indoor throttling device (12), a first pipe (131), and a second pipe (132). The first pipe (131) and the second pipe (132) are heat exchanged together. The first end of the first pipe (131) is used to connect to the outdoor unit (2) through the first pipe (18). The two ends of the first pipe (131) are connected to the first end of the first indoor throttling device (12). The second end of the first indoor throttling device (12) is connected to the first end of the first indoor heat exchanger (11). The second end of the first indoor heat exchanger (11) is used to connect to the outdoor unit (2). The second indoor heat exchanger (14) and the second indoor throttling component (15) are connected at the first end to the outdoor unit (2) via the first pipe (18), at the second end to the first end to the second pipe (132), at the second end to the first end to the second indoor heat exchanger (14), and at the second end to the outdoor unit (2).

2. The indoor unit according to claim 1, characterized in that, It also includes a first heat exchanger (13), which has a first flow channel and a second flow channel. The first flow channel and the second flow channel can exchange heat. The first flow channel is connected in series to the first pipeline (131), and the second flow channel is connected in series to the second pipeline (132).

3. The indoor unit according to claim 1, characterized in that, It also includes a third pipe (161) and a fourth pipe (162), the third pipe (161) and the fourth pipe (162) are heat exchanged together, the second end of the first indoor throttling component (12) is connected to the first end of the first indoor heat exchanger (11) through the third pipe (161), and the first pipe (18) is connected to the first end of the second indoor throttling component (15) through the fourth pipe (162).

4. The indoor unit according to claim 3, characterized in that, It also includes a second heat exchanger (16), which has a third flow channel and a fourth flow channel, the third flow channel and the fourth flow channel being able to exchange heat, the third flow channel being connected in series to the third pipeline (161), and the fourth flow channel being connected in series to the fourth pipeline (162).

5. The indoor unit according to claim 1, characterized in that, It also includes a fifth pipe (171) and a sixth pipe (172), the fifth pipe (171) and the sixth pipe (172) are heat exchanged together, the first pipe (18) is connected to the first end of the first pipe through the fifth pipe (171), and the second end of the first indoor throttling component (12) is connected to the first end of the first indoor heat exchanger (11) through the sixth pipe (172).

6. The indoor unit according to claim 5, characterized in that, It also includes a third heat exchanger (17), which has a fifth flow channel and a sixth flow channel. The fifth flow channel and the sixth flow channel can exchange heat. The fifth flow channel is connected in series to the fifth pipeline (171), and the sixth flow channel is connected in series to the sixth pipeline (172).

7. The indoor unit according to claim 1, characterized in that, The heat exchange area of ​​the first indoor heat exchanger (11) is larger than that of the second indoor heat exchanger (14).

8. The indoor unit according to claim 1, characterized in that, The first indoor heat exchanger (11) and the second indoor heat exchanger (14) are arranged adjacent to each other. The indoor unit also includes a first fan, which is located on the side of the first indoor heat exchanger (11) away from the second indoor heat exchanger (14) and is used to blow air toward the first indoor heat exchanger (11).

9. The indoor unit according to claim 1, characterized in that, The second end of the first indoor heat exchanger (11) is used to connect to the compressor (21) of the outdoor unit (2) through the second pipe (19), and the second end of the second indoor heat exchanger (14) is used to connect to the compressor (21) through the third pipe (110).

10. The indoor unit according to any one of claims 1-9, characterized in that, It also includes a first connecting pipe, the first end of which is connected to the first end of the first pipe, the second end of which is connected to the first end of the second indoor throttling component (15), and the first pipe (18) is connected to the middle part of the first connecting pipe located between the first end and the second end.

11. A multi-split air conditioning system, characterized in that, It includes an outdoor unit (2) and an indoor unit according to any one of claims 1-10.

12. The multi-unit air conditioning system according to claim 11, characterized in that, There are multiple indoor units. In any one of the indoor units, the first end of the first pipe is connected to the outdoor unit (2) through the first pipe (18), the second end of the first indoor heat exchanger (11) is connected to the outdoor unit (2), and the second end of the second indoor heat exchanger (14) is connected to the outdoor unit (2).

13. The multi-unit air conditioning system according to claim 11, characterized in that, The outdoor unit (2) includes a compressor (21), an outdoor heat exchanger (23), an outdoor throttling component (24), a first commutation assembly (25), and a second commutation assembly (26). The first reversing component (25) has a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, and the second reversing component (26) has a first inlet and outlet, a second inlet and outlet and a third inlet and outlet; The first connecting port and the first inlet / outlet are respectively connected to the outlet of the compressor (21), and the third connecting port and the third inlet / outlet are respectively connected to the inlet of the compressor (21); The second connection port is connected to the first end of the outdoor heat exchanger (23), the second end of the outdoor heat exchanger (23) is connected to the first end of the outdoor throttling component (24), the second end of the outdoor throttling component (24) is connected to the first pipe (18), the fourth connection port is connected to the second end of the first indoor heat exchanger (11) through the second pipe (19), and the second inlet and outlet are connected to the second end of the second indoor heat exchanger (14) through the third pipe (110).

14. The multi-unit air conditioning system according to claim 13, characterized in that, The outdoor unit (2) also includes a gas-liquid separator (22), the third connecting port and the third inlet / outlet are respectively connected to the inlet of the gas-liquid separator (22), and the outlet of the gas-liquid separator (22) is connected to the inlet of the compressor (21).

15. The multi-unit air conditioning system according to claim 13, characterized in that, The multi-split air conditioning system has a cooling mode in which the first and second connecting ports are connected, the third and fourth connecting ports are connected, the second inlet and outlet are connected, and the third inlet and outlet are connected; the first indoor throttling component (12), the second indoor throttling component (15), and the outdoor throttling component (24) are all open; and / or, The multi-split air conditioning system has a heating mode in which the first and fourth connecting ports are connected, the second and third connecting ports are connected, the first and second inlet / outlet ports are connected, and the first indoor throttling component (12), the second indoor throttling component (15), and the outdoor throttling component (24) are all open; and / or, The multi-split air conditioning system has a constant temperature dehumidification mode. In the constant temperature dehumidification mode, the first connection port and the second connection port are connected, the third connection port and the fourth connection port are connected, the first inlet and outlet port and the second inlet and outlet port are connected, and the first indoor throttling component (12), the second indoor throttling component (15) and the outdoor throttling component (24) are all open.

16. The multi-unit air conditioning system according to claim 15, characterized in that, In the cooling mode, the first indoor throttling component (12) is in a throttling state, the second indoor throttling component (15) is in a throttling state, and the outdoor throttling component (24) is in a fully open state; In the heating mode, the first indoor throttling component (12) is fully open, the second indoor throttling component (15) is fully open, and the outdoor throttling component (24) is in a throttling state; In the constant temperature dehumidification mode, the first indoor throttling component (12) is in the fully open state, the second indoor throttling component (15) is in the throttling state, and the outdoor throttling component (24) is in the throttling state.

Images