Composite valve and multi-connected air conditioner

Abstract

The application provides a composite valve and a multi-connected air conditioner, and relates to the technical field of air conditioners. The valve monomer of the composite valve can switch the communication relationship between the first pipe body, the second pipe body and the connecting port by moving the first valve core. By switching the position of the first valve core, the corresponding indoor unit can be selectively communicated with the first pipe body or the second pipe body. When the indoor unit is communicated with the first pipe body, it is a high-pressure end and serves as a condenser to heat; when the indoor unit is communicated with the second pipe body, it is a low-pressure end and serves as an evaporator to cool. The composite valve with multiple valve monomers is used in the multi-connected air conditioner, and two indoor units can simultaneously perform cooling or heating. One valve monomer in the composite valve can switch the cooling or heating of one indoor unit, so that the composite valve can simplify the pipeline and the valve, reduce the size of the outdoor unit, and make it easier to realize the cooling and heating freedom function in the household multi-connected air conditioner.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to a composite valve and a multi-split air conditioner. Background Technology

[0002] In the residential air conditioning market, the installation volume of air conditioners is evolving from one unit per household to one unit per room. Simultaneously, the demand for multi-split air conditioners with one outdoor unit supporting multiple indoor units is also increasing. However, in some existing multi-split air conditioners, different indoor units cannot simultaneously perform cooling and heating independently, failing to meet the inconsistent heating and cooling needs of users in small-scale hotels or dormitories. Some multi-split air conditioners in office buildings feature a dual-function cooling and heating system, utilizing numerous solenoid valves and piping to achieve this. However, existing residential fixed-type air conditioners have size limitations for their outdoor units, making it difficult to incorporate the complex refrigeration systems found in existing dual-split air conditioners with dual-function cooling and heating. Summary of the Invention

[0003] This application aims to improve the problem of complex outdoor unit piping and large size of multi-split air conditioners with independent heating and cooling functions in related technologies.

[0004] To address the aforementioned issues, in a first aspect, this application provides a composite valve for use in multi-split air conditioning systems. The valve includes a valve unit comprising a valve cylinder, a first valve core, a first tube body, a second tube body, and a drive assembly. The first valve core is tubular, and the valve cylinder is sleeved around it. The valve cylinder has a first end and a second end opposite to each other. The first tube body communicates with the valve cylinder at a first node, and the second tube body communicates with the valve cylinder at a second node. The first node is closer to the first end of the valve cylinder than the second node. The second end of the valve cylinder has a connection port for connecting to an indoor unit. The drive assembly drives the first valve core to move axially between a first position and a second position along the valve cylinder. During the movement of the first valve core, the inner wall of the valve cylinder between the first and second nodes remains sealed to the outer wall of the first valve core. The first valve core has a first opening near the first end and a second opening near the second end. When the first valve core is in the first position, the first opening is not connected to the first node, and the connection port is connected to the second node. When the first valve core is in the second position, the first opening is connected to the first node, the second opening is connected to the connection port, and the connection port is not connected to the second node.

[0005] In the composite valve provided in this application embodiment, the valve unit can switch the connection relationship between the first pipe body, the second pipe body, and the connection port by moving the first valve core. When the first valve core is in the first position, the second pipe body, the second node, and the connection port are connected; when the first valve core is in the second position, the first pipe body, the first node, the first valve core, and the connection port are connected. When this composite valve is used in a multi-split air conditioner, the connection port of the valve unit is connected to the corresponding indoor unit. The first pipe body can always be connected to the compressor's exhaust side pipeline as a high-pressure pipeline, while the second pipe body is connected to the compressor's suction side pipeline or to a four-way reversing valve as a low-pressure pipeline. By switching the position of the first valve core, the corresponding indoor unit can be selectively connected to either the first pipe body or the second pipe body. When the indoor unit is connected to the first pipe body, it is at the high-pressure end, acting as a condenser for heating; when the indoor unit is connected to the second pipe body, it is at the low-pressure end, acting as an evaporator for cooling. Using a composite valve with multiple valve units in a multi-split air conditioner allows the first valve core of different valve units to be in different positions, enabling two indoor units to simultaneously perform cooling or heating independently. Furthermore, compared to existing technologies that use two valves to switch between cooling and heating for a single indoor unit, the composite valve in this embodiment only requires one valve unit. Therefore, using this composite valve simplifies piping and valves, reduces the size of the outdoor unit, and makes it easier to implement the independent cooling and heating function in residential multi-split air conditioners.

[0006] In an optional embodiment, the valve cylinder is provided with a first sealing part and a second sealing part. The first sealing part is located on the side of the first node away from the second node, and the second sealing part is located on the side of the second node away from the first node. When the first valve core is in the first position, the end face surrounding the first opening abuts against the first sealing part, and the first valve core disengages from the second sealing part. When the first valve core is in the second position, the end face surrounding the first opening disengages from the first sealing part, and the end face surrounding the second opening abuts against the second sealing part. The second sealing part is annular to allow the second opening to communicate with the connection port. In this embodiment, by using the first sealing part to abut against the end of the first valve core with the first opening, the first opening can be isolated from the first node, that is, the first tube body cannot communicate with the connection port, while the second tube body can communicate with the connection port. By using the second sealing part to abut against the end of the first valve core with the second opening, the connection port can communicate with the first tube body through the second opening, the first opening, and the first node, but cannot communicate with the second tube body.

[0007] In an optional embodiment, the first pipe body and the valve cylinder are cross-connected at the first node, and the second pipe body and the valve cylinder are cross-connected at the second node. The inner diameter of the valve cylinder at the first and second nodes is larger than the outer diameter at the corresponding position of the first valve core, so that the first valve core cannot block the medium in the first pipe body from passing through the first node at the first position, and the first valve core cannot block the medium in the second pipe body from passing through the second node at the second position. By setting the inner diameter of the first and second nodes to be larger than the outer diameter at the corresponding position of the first valve core, even if the first valve core crosses the corresponding node, it cannot block the corresponding pipe body from passing through the corresponding node. The purpose of this is that when the composite valve includes multiple valve units, and the first pipe bodies of each valve unit are sequentially connected, even if the connection port is not connected to one of the first nodes, the refrigerant can still pass through that first node and flow to the first node of another valve unit. If the first node of that valve unit is connected to the connection port, it can flow through the first node to the connection port. The same effect is achieved when the second pipe bodies of each valve unit are connected.

[0008] In an optional embodiment, a first sealing ring is provided around the first valve core, and the outer side of the first sealing ring seals against the inner wall between the first node and the second node of the valve cylinder. By providing the first sealing ring, the first node and the second node of the valve unit can be isolated.

[0009] In an optional embodiment, the first sealing ring is fixed to the first valve core, and when the first valve core moves between the first position and the second position, the first sealing ring slides relative to the valve cylinder between the first node and the second node.

[0010] In an optional embodiment, the driving assembly includes a coil, an iron core, and an elastic element. The iron core is drively connected to the first valve core. The coil provides electromagnetic force to the iron core to drive it to move along a first direction. The elastic element provides a force to the first valve core in a second direction. The first direction is from the second end of the valve cylinder to the first end, and the second direction is from the first end of the valve cylinder to the second end. By driving the iron core with the coil, the first valve core can overcome the force of the elastic element and move to the first position. When the coil is de-energized, the first valve core can move to the second position under the restoring force of the elastic element.

[0011] In an optional embodiment, the valve cylinder includes a first cylinder and a second cylinder that are axially connected. Both the first node and the second node are located in the first cylinder. The second cylinder is connected to the end of the first cylinder near the first node. A first sealing part is provided at the junction of the first cylinder and the second cylinder. The first sealing part is annular. The valve unit also includes a second valve core disposed in the second cylinder. One end of the second valve core passes through the first sealing part and extends into the first cylinder, and is fixedly connected to the first valve core. The second valve core and the first sealing part are slidably sealed together so that the first cylinder and the second cylinder cannot communicate through the gap between the second valve core and the first sealing part. An iron core is connected to the second valve core.

[0012] In an optional embodiment, the drive assembly includes a housing, which covers the end of the second cylinder away from the first cylinder. An iron core is disposed inside the housing. A second sealing ring and a third sealing ring are fitted around the outer side of the second valve core, abutting against the inner wall of the second cylinder. The second and third sealing rings divide the cavity formed by the second cylinder and the housing into a first chamber, a second chamber, and a third chamber, arranged sequentially and spaced apart along a first direction. The valve cylinder has a first channel connecting the first chamber and a first node. The valve unit also has a second channel connecting the second chamber and the second pipe body. The second valve core has a third channel and a fourth channel. One end of the third channel connects to the first chamber, and the other end connects to the third chamber; one end of the fourth channel... The first chamber is connected to the second chamber, and the second chamber is connected to the third chamber. A columnar third valve core is provided on the iron core. The third valve core is inserted into the second valve core along the second direction. An avoidance hole is provided on the third valve core. The avoidance hole penetrates the third valve core radially. A limiting part is protruding on the outer periphery of the third valve core. The third valve core can move relative to the second valve core in the insertion direction between the third position and the fourth position. When the third valve core is in the third position, the limiting part abuts against the second valve core on the side facing the iron core, and the third valve core blocks the third channel. The avoidance hole allows the fourth channel to be unobstructed. When the third valve core is in the fourth position, the limiting part abuts against the second valve core on the side away from the iron core, and the third valve core blocks the fourth channel. The avoidance hole allows the third channel to be unobstructed.

[0013] In this embodiment, the third valve core pushes and pulls the second valve core to adjust the position of the first valve core. Furthermore, by providing a first channel, a second channel, a third channel, and a fourth channel, and by providing a clearance hole in the third valve core to cooperate with the third and fourth channels, the communication state between the third chamber and the first or second pipe body is different when the third valve core is in different positions. The pressure in the third chamber is switchable, making the adjustment of the first valve core's position easier. Specifically, when the first valve core is in the first position, when the third valve core moves along the second direction to the fourth position, the first pipe body (which often contains high-pressure refrigerant) communicates with the third chamber, facilitating the third valve core to continue moving in the second direction to push the first valve core to the second position. When the first valve core is in the second position, when the third valve core moves along the first direction to the third position, the second pipe body (which often contains low-pressure refrigerant) communicates with the third chamber, facilitating the third valve core to continue moving in the first direction to push the first valve core to the first position. Therefore, this structure makes the adjustment of the first valve core's position easier.

[0014] In an optional embodiment, the first channel is embedded within the first sealing portion.

[0015] In an optional embodiment, the clearance hole includes a first clearance hole and a second clearance hole spaced apart along a first direction. When the third valve core is in the third position, the second clearance hole allows the fourth channel to be unobstructed, and when the third valve core is in the fourth position, the first clearance hole allows the third channel to be unobstructed.

[0016] In an optional embodiment, the composite valve includes multiple valve units, with the first pipe of each valve unit connected in sequence and the second pipe of each valve unit connected in sequence.

[0017] Secondly, this application provides a multi-split air conditioner, including an outdoor unit and multiple indoor units. The outdoor unit includes a compressor and the aforementioned composite valve. Each valve unit of the composite valve corresponds to one indoor unit, and the valve units are connected to their respective indoor units via connection ports. The first and second pipes of the composite valve are both connected to the compressor, and the first pipe is connected to the compressor's exhaust side pipeline to receive gaseous refrigerant. In this embodiment, the valve units are integrated together, resulting in a smaller size and easier placement within the outdoor unit. Furthermore, the first valve cores in different valve units can be in different positions, allowing the corresponding indoor units to be in high-pressure and low-pressure positions respectively, thereby achieving simultaneous cooling or heating. When the compressor supplies high-pressure refrigerant to the outdoor heat exchanger (cooling mode from the outdoor unit's perspective), and multiple indoor units are turned on, with the first valve cores in the valve units corresponding to multiple indoor units all in the first position, these indoor units are connected to the second pipe, which is the low-pressure side, enabling cooling. If the first valve core in one valve unit is adjusted to the second position, the indoor unit corresponding to that valve unit can heat, while the other indoor units cool.

[0018] In an optional embodiment, the outdoor unit includes an outdoor heat exchanger and a four-way reversing valve. The four ports of the four-way reversing valve are respectively connected to the compressor's exhaust side pipeline, the compressor's suction side pipeline, the outdoor heat exchanger, and the second pipe body of the composite valve. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a multi-split air conditioner with independent heating and cooling functions in related technologies;

[0020] Figure 2 This is a schematic diagram of a multi-split air conditioner in one embodiment of this application;

[0021] Figure 3 , Figure 4 This is a schematic diagram illustrating the principle of valve unit switching in one embodiment of this application;

[0022] Figure 5 This is a cross-sectional view of a single valve unit of the composite valve in a first orientation in one embodiment of this application;

[0023] Figure 6 This is a cross-sectional view of a valve unit at the first node in one embodiment of this application;

[0024] Figure 7 This is a cross-sectional view of the valve unit of the composite valve in a second orientation in one embodiment of this application;

[0025] Figure 8 This is a schematic diagram of a first valve core being pulled to a first position and maintained in one embodiment of this application;

[0026] Figure 9 This is a schematic diagram of a third valve core about to push the first valve core to a second position in one embodiment of this application;

[0027] Figure 10 This is a schematic diagram of a first valve core being pushed to a second position and maintained in one embodiment of this application;

[0028] Figure 11 This is a schematic diagram of a third valve core about to pull the first valve core to a first position in one embodiment of this application;

[0029] Figure 12 This is a schematic diagram showing the position of the diameter dimension in a valve unit according to one embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 010-Multi-split air conditioner; 100-Outdoor unit; 110-Compressor; 120-Four-way reversing valve; 130-Outdoor heat exchanger; 140-Liquid line distributor; 150-Expansion valve; 200-Indoor unit; 300-Combination valve; 301-Valve unit; 310-Valve cylinder; 311-First cylinder; 312-First node; 313-Second node; 314-Connection port; 315-First sealing part; 316-Second sealing part; 317-First channel; 318-Second channel; 319-Second... Cylinder; 320-First tube body; 330-Second tube body; 340-First valve core; 341-First opening; 342-Second opening; 343-First sealing ring; 350-Second valve core; 351-Second sealing ring; 352-Third sealing ring; 353-First chamber; 354-Second chamber; 355-Third chamber; 356-Third channel; 357-Fourth channel; 360-Third valve core; 361-Limiting part; 362-First clearance hole; 363-Second clearance hole; 370-Iron core; 371-Tube shell. Detailed Implementation

[0031] Figure 1 This is a schematic diagram of a multi-split air conditioner with independent heating and cooling functions, based on related technologies. Figure 1As shown, a multi-split air conditioner with independent cooling and heating function in related technologies includes multiple indoor units and one outdoor unit. Taking the cooling mode as an example, the compressor's discharge side is connected to the outdoor heat exchanger via a four-way valve, while the indoor units are at the low-pressure end, absorbing heat and cooling through refrigerant evaporation. To achieve the independent cooling and heating function, multiple high-pressure lines (the number corresponding to the number of indoor units) branch off from the compressor's discharge side pipeline, connecting to the downstream of the corresponding indoor unit (here, downstream refers to the downstream direction of refrigerant flow in cooling mode) and returning to the low-pressure line of the outdoor unit. These high-pressure lines are equipped with solenoid valves, and solenoid valves are also installed on the low-pressure lines, with the solenoid valves on the low-pressure lines located downstream of the high-pressure line connection points. In normal cooling mode, the solenoid valves on each low-pressure line are open, and the solenoid valves on the high-pressure lines are closed. The refrigerant passes sequentially through the compressor, outdoor heat exchanger, expansion valve, and indoor unit, and then returns to the compressor in the outdoor unit. When one of the indoor units needs heating, the solenoid valve on the corresponding high-pressure line opens, while the solenoid valve on the corresponding low-pressure line closes. This allows the high-temperature, high-pressure refrigerant to directly enter the corresponding indoor unit through the high-pressure line, where it liquefies and heats. After liquefaction, it passes through the expansion valve and liquid line distributor, then enters the pipelines of other indoor units operating in cooling mode. It then passes through the expansion valve and the indoor unit again, achieving vaporization, and finally returns to the outdoor unit from the low-pressure line of that cooling indoor unit, completing the cycle. However, this type of multi-split air conditioner uses too many solenoid valves; at least ten solenoid valves are needed for five indoor units. Therefore, the outdoor unit's piping is complex and bulky, which is not suitable for residential use.

[0032] In order to simplify the outdoor unit piping of a multi-split air conditioner with both heating and cooling functions and reduce its size so that it can be used in ordinary households, this application provides a composite valve and a multi-split air conditioner using the composite valve.

[0033] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] Figure 2 This is a schematic diagram of a multi-split air conditioner 010 according to one embodiment of this application. The multi-split air conditioner 010 provided in this embodiment includes an outdoor unit 100 and multiple indoor units 200. Figure 2 As shown, the outdoor unit 100 includes an outdoor heat exchanger 130, a compressor 110, a four-way reversing valve 120, and a composite valve 300 provided in the embodiments of this application. Figure 2 The diagram shown illustrates the overall operation of the multi-split air conditioner 010 in cooling mode. However, this cooling mode refers to the outdoor heat exchanger 130 acting as a condenser, not that the indoor units 200 can only operate in cooling mode. In fact, in the multi-split air conditioner 010 of this application embodiment, some indoor units 200 are also allowed to operate in heating mode during cooling.

[0035] like Figure 2As shown, the composite valve 300 includes multiple valve units 301, each valve unit 301 including a first pipe body 320 and a second pipe body 330. The first pipe bodies 320 of each valve unit 301 are connected in series, and the second pipe bodies 330 are also connected in series. Both the first pipe body 320 and the second pipe body 330 of the composite valve 300 are connected to the compressor 110, and the first pipe body 320 is connected to the exhaust side pipeline of the compressor 110 to receive high-pressure gaseous refrigerant. Specifically, in this embodiment, the four ports of the four-way reversing valve 120 are respectively connected to the exhaust side pipeline of the compressor 110, the suction side pipeline of the compressor 110, the outdoor heat exchanger 130, and the second pipe body 330 of the composite valve 300. In this embodiment, the high-pressure pipeline is connected to the first pipe body 320, which typically carries high-pressure, high-temperature gaseous refrigerant, while the low-pressure pipeline is connected to the second pipe body 330, which typically carries low-temperature, low-pressure gaseous refrigerant. The valve unit 301 of the composite valve 300 can be switched to selectively connect either the first pipe 320 to the indoor unit 200 or the second pipe 330 to the indoor unit 200. Under cooling conditions, if all indoor units 200 are operating simultaneously, the valve unit 301 corresponding to these indoor units 200 should be switched to the state where the second pipe 330 connects to the indoor unit 200, and the first pipe 320 is not connected to the second pipe 330 or the indoor unit 200. At this time, the refrigerant circulation process is as follows: the compressor 110 delivers high-temperature and high-pressure refrigerant, which is liquefied through the outdoor heat exchanger 130, and then enters the corresponding pipeline of each indoor unit 200 through the liquid pipe distributor 140. After passing through the expansion valve 150, it enters the indoor unit 200 and evaporates (i.e., the indoor unit 200 is in cooling operation), becoming gaseous refrigerant again. The low-pressure gaseous refrigerant from the indoor unit 200 will flow through the second pipe 330 to the four-way reversing valve 120 and then flow back to the suction side of the compressor 110. It should be noted that during this process, the high-pressure refrigerant output from the discharge side of the compressor 110 cannot enter the indoor unit 200 through the first pipe 320. However, when one of the indoor units 200 needs heating, instead of switching the four-way reversing valve 120, the valve unit 301 corresponding to the indoor unit 200 in the composite valve 300 is switched, connecting the first pipe 320 of the valve unit 301 to the indoor unit 200 while disconnecting the second pipe 330 from the indoor unit 200 (the second pipe 330 is also not connected to the first pipe 320). High-temperature, high-pressure gaseous refrigerant from the exhaust side of the compressor 110 is then introduced into the first pipe 320, directly entering the corresponding indoor unit 200. At this time, the indoor unit 200 acts as a condenser, releasing heat (heating operation). It should be noted that since the states of the valve units 301 corresponding to the other indoor units 200 are not switched, even if there is high-temperature, high-pressure refrigerant in the first pipe 320, it will not enter the indoor units 200 through these unswitched valve units 301, and these indoor units 200 will continue to operate in cooling mode.

[0036] After the refrigerant in the indoor unit 200 operating in heating mode is liquefied, it enters the liquid line distributor 140. Due to pressure, it does not transfer to the outdoor heat exchanger 130, but instead enters the pipelines of other indoor units 200 operating in cooling mode. There, it vaporizes and absorbs heat, eventually returning to the outdoor unit 100. In other words, the indoor unit 200 operating in heating mode acts as a condenser, while the other indoor units 200 act as evaporators, forming the refrigerant circulation loop for that indoor unit 200 operating in heating mode.

[0037] In some optional embodiments, the four-way reversing valve 120 may also be omitted, so that the outdoor heat exchanger 130 is always at the high-pressure end and the second pipe 330 is always connected to the suction side of the compressor 110.

[0038] Figure 3 , Figure 4 This is a schematic diagram illustrating the switching principle of valve unit 301 in one embodiment of this application. It should be understood that... Figure 3 , Figure 4 The valve unit 301 used to demonstrate the switching principle of the composite valve 300 is not intended to limit the specific structure of the composite valve 300. Figure 3 , Figure 4 The middle arrow indicates the direction of refrigerant flow. For example... Figure 3 , Figure 4 As shown, the composite valve 300 provided in this embodiment includes a valve cylinder 310, a first valve core 340, a first tube body 320, and a second tube body 330. The first valve core 340 is tubular, and the valve cylinder 310 is sleeved outside the first valve core 340, with the valve cylinder 310 having opposing first and second ends. Figure 3 , Figure 4 In this configuration, the first end is the left end, and the second end is the right end. The first pipe body 320 is connected to the valve cylinder 310 at the first node 312 of the valve cylinder 310, and the second pipe body 330 is connected to the valve cylinder 310 at the second node 313 of the valve cylinder 310. The first node 312 is closer to the first end of the valve cylinder 310 than the second node 313. The second end of the valve cylinder 310 has a connection port 314 for connecting to the indoor unit 200. In this embodiment, each valve unit 301 of the composite valve 300 corresponds one-to-one with the indoor unit 200, and the valve unit 301 is connected to the corresponding indoor unit 200 through the connection port 314.

[0039] The first valve core 340 can be controllably moved between a first position and a second position along the axial direction of the valve cylinder 310. During the movement of the first valve core 340, the inner wall of the valve cylinder 310 between the first node 312 and the second node 313 is always in a sealed connection with the outer wall of the first valve core 340. The first valve core 340 has a first opening 341 near the first end and a second opening 342 near the second end. When the first valve core 340 is in the first position (e.g., ...), ... Figure 3 As shown), the first opening 341 is not connected to the first node 312, and the connection port 314 is connected to the second node 313; when the first valve core 340 is in the second position (as shown), Figure 4 As shown, the first opening 341 is connected to the first node 312, the second opening 342 is connected to the connection port 314, and the connection port 314 is not connected to the second node 313. It can be seen that by controlling the first valve core 340 to switch between the first and second positions, the first pipe body 320 and the second pipe body 330 can be selectively connected to the connection port 314. When the first pipe body 320 is connected to the connection port 314, the corresponding indoor unit 200 is at high pressure and can operate in heating mode; when the second pipe body 330 is connected to the connection port 314, the corresponding indoor unit 200 is at low pressure and can operate in cooling mode. Since the inner wall of the valve cylinder 310 between the first node 312 and the second node 313 is always sealed to the outer wall of the first valve core 340, the refrigerant in the first node 312 and the second node 313 will not flow between them regardless of whether the first valve core 340 is in the first or second position, meaning that the low-pressure refrigerant and the high-pressure refrigerant are isolated from each other.

[0040] Furthermore, a first sealing part 315 and a second sealing part 316 may be provided inside the valve cylinder 310. The first sealing part 315 is located on the side of the first node 312 away from the second node 313, and the second sealing part 316 is located on the side of the second node 313 away from the first node 312. When the first valve core 340 is in the first position, the end face surrounding the first opening 341 abuts against the first sealing part 315, and the first valve core 340 disengages from the second sealing part 316. When the first valve core 340 is in the second position, the end face surrounding the first opening 341 disengages from the first sealing part 315, and the end face surrounding the second opening 342 abuts against the second sealing part 316. The second sealing part 316 is annular so that the second opening 342 communicates with the connection port 314. In this embodiment, by using the first sealing part 315 to abut against the end of the first valve core 340 with the first opening 341, the first opening 341 can be isolated from the first node 312, that is, the first tube body 320 cannot communicate with the connection port 314, while the second tube body 330 can communicate with the connection port 314; by using the second sealing part 316 to abut against the end of the first valve core 340 with the second opening 342, the connection port 314 can communicate with the first tube body 320 through the second opening 342, the first opening 341, and the first node 312, but cannot communicate with the second tube body 330. In this embodiment, the second sealing part 316 is annular and can form a hole to avoid the second opening 342, so that the second opening 342 can communicate with the connection port 314; Figure 3 ,like Figure 4 As shown, the first sealing part 315 can also be configured as an annular shape. Specifically, the sealing surfaces of the first sealing part 315 and the second sealing part 316 that abut against the first valve core 340 are both conical surfaces, so that the first sealing part 315 and the second sealing part 316 can abut against the first valve core 340, thereby enhancing the sealing effect.

[0041] It should be noted that the structure of valve unit 301 is not limited to Figure 3 , Figure 4 Optionally, the first tube 320 and / or the second tube 330 can be cross-connected to the valve cylinder 310 (e.g., perpendicularly intersecting each other in a cross shape), meaning the first tube 320 and / or the second tube 330 can extend from opposite sides of the valve cylinder 310. This structure corresponds to the valve unit 301. Figure 2 All valve units except the bottom one are 301. And as... Figure 3 , Figure 4 The illustrated embodiments can be used as Figure 2 The bottommost valve unit 301 (because no other structures need to be connected in series below it).

[0042] Figure 5 This is a cross-sectional view of the valve unit 301 of the composite valve 300 in a first posture in one embodiment of this application; Figure 6This is a cross-sectional view of valve unit 301 at the first node 312 in one embodiment of this application. Figure 5 and Figure 6 As shown, in this embodiment, the first pipe body 320 and the valve cylinder 310 are cross-connected at the first node 312, and the second pipe body 330 and the valve cylinder 310 are cross-connected at the second node 313. Furthermore, the inner diameter of the valve cylinder 310 at the first node 312 and the second node 313 is larger than the outer diameter of the first valve core 340 at the corresponding positions, so that the first valve core 340 cannot block the medium in the first pipe body 320 from passing through the first node 312 at the first position, and the first valve core 340 cannot block the medium in the second pipe body 330 from passing through the second node 313 at the second position. By setting the inner diameter of the first node 312 and the second node 313 to be larger than the outer diameter of the first valve core 340 at the corresponding positions, even if the first valve core 340 crosses the corresponding node, it cannot block the corresponding pipe body from passing through the corresponding node. The purpose of this is to keep the first node 312 of each series-connected valve unit 301 always connected, maintaining pressure balance. If the first valve core 340 of any valve unit 301 moves to the second position, refrigerant can be introduced from that valve unit 301 into the corresponding indoor unit 200 for heating. For example, even if the first valve core 340 of the upstream valve unit 301 is in the first position, the refrigerant can still flow through the first node 312 of the upstream valve unit 301 (i.e., bypassing the first valve core 340 at the first node 312) to the downstream valve unit 301. If the first valve core 340 of the downstream valve unit 301 is in the second position, the refrigerant can enter the first valve core 340 from the first node 312 and finally flow into the indoor unit 200 through the connection port 314. In other words, the upstream valve unit 301 prevents the high-temperature, high-pressure refrigerant from entering the indoor unit 200, and the indoor unit 200 corresponding to this valve unit 301 is in cooling operation. However, this does not prevent the high-pressure refrigerant from flowing through the first node 312 of this valve unit 301 to other valve units 301. Thus, the downstream valve unit 301 can switch the first valve core 340 to the second position, enabling the corresponding indoor unit 200 to heat. Similarly, in this embodiment, the second nodes 313 of each valve unit 301 are also connected through the second pipe 330, and the first valve core 340 cannot block the flow of refrigerant between the second nodes 313.

[0043] like Figure 5As shown, a first sealing ring 343 is fitted over the first valve core 340, and the outer side of the first sealing ring 343 seals against the inner wall between the first node 312 and the second node 313 of the valve cylinder 310. The first sealing ring 343 isolates the first node 312 and the second node 313 of the valve unit 301. The first sealing ring 343 is fixed to the first valve core 340, and when the first valve core 340 moves between the first position and the second position, the first sealing ring 343 slides relative to the valve cylinder 310 between the first node 312 and the second node 313. Figure 5 As shown, a mounting platform protrudes from the outer periphery of the first valve core 340, and a groove is provided on the mounting platform. The first sealing ring 343 is embedded in the groove of the mounting platform and thus fixed. In other optional embodiments, the first sealing ring 343 can also be fixedly disposed on the inner wall of the valve cylinder 310, so that the outer periphery of the first valve core 340 slides relative to the first sealing ring 343.

[0044] In this embodiment, the driving assembly includes a coil (not shown), an iron core 370, and an elastic element (not shown). The iron core 370 is drively connected to the first valve core 340. The coil provides electromagnetic force to the iron core 370 to drive it to move along a first direction. The elastic element provides a force to the first valve core 340 in a second direction. The first direction is from the second end to the first end of the valve cylinder 310, i.e., the direction in which the first valve core 340 moves from the second position to the first position. The second direction is from the first end to the second end of the valve cylinder 310, i.e., the direction in which the first valve core 340 moves from the first position to the second position. By driving the iron core 370 with the coil, the first valve core 340 can overcome the force of the elastic element and move to the first position. When the coil is de-energized, the first valve core 340 can move to the second position under the restoring force of the elastic element. It should be understood that the transmission connection between the iron core 370 and the first valve core 340 includes direct or indirect connection with the first valve core 340; and the elastic element can also be set in various ways, it can be directly connected to the first valve core 340 to provide thrust or pull, or it can be indirectly connected to the first valve core 340.

[0045] like Figure 5As shown, the valve cylinder 310 in this embodiment includes a first cylinder 311 and a second cylinder 319 connected axially. A first node 312 and a second node 313 are both located in the first cylinder 311, and a first valve core 340 is disposed within the first cylinder 311. The second cylinder 319 is connected to the end of the first cylinder 311 near the first node 312. A first sealing portion 315 is provided at the junction of the first cylinder 311 and the second cylinder 319. The first sealing portion 315 is annular and has a conical sealing surface for abutting against the first valve core 340. The valve unit 301 in this embodiment also includes a second valve core 350 disposed within the second cylinder 319. One end of the second valve core 350 passes through the first sealing portion 315 and extends into the first cylinder 311, and is fixedly connected to the first valve core 340, thereby moving synchronously with the first valve core 340. The second valve core 350 is slidably and sealingly connected to the first sealing part 315, so that the first cylinder 311 and the second cylinder 319 cannot communicate through the gap between the second valve core 350 and the first sealing part 315. The iron core 370 is connected to the second valve core 350.

[0046] Furthermore, the drive assembly includes a housing 371, which covers the end of the second cylinder 319 away from the first cylinder 311, and an iron core 370 is disposed inside the housing 371. A second sealing ring 351 and a third sealing ring 352 are fitted around the outer side of the second valve core 350, abutting against the inner wall of the second cylinder 319. In this embodiment, the second sealing ring 351 is closer to the first valve core 340 than the third sealing ring 352. The second sealing ring 351 and the third sealing ring 352 divide the cavity formed by the second cylinder 319 and the housing 371 into a first chamber 353, a second chamber 354, and a third chamber 355, which are sequentially spaced along a first direction. The valve cylinder 310 is provided with a first channel 317 to connect the first chamber 353 and the first node 312, and the valve unit 301 is also provided with a second channel 318 to connect the second chamber 354 and the second pipe 330. In this embodiment, the first channel 317 is embedded within the first sealing portion 315, penetrating the first sealing portion 315 in a first direction to connect the first node 312 and the first chamber 353, ensuring that their refrigerant pressures are consistent. The second channel 318 is located outside the valve cylinder 310, with one end connected to the second pipe body 330 and the other end connected to the second cylinder body 319, communicating with the second chamber 354. It can be understood that in this embodiment, the pressure in the first chamber 353 is consistent with that in the first pipe body 320 (high pressure), while the pressure in the second chamber 354 is consistent with that in the second pipe body 330 (low pressure).

[0047] The second valve core 350 has a third channel 356 and a fourth channel 357. One end of the third channel 356 connects to the first chamber 353, and the other end connects to the third chamber 355. One end of the fourth channel 357 connects to the second chamber 354, and the other end connects to the third chamber 355. Therefore, if the third chamber 355 is connected to the first chamber 353 via the third channel 356, it will be filled with high-pressure refrigerant and become a high-pressure chamber. If the third chamber 355 is connected to the second chamber 354 via the fourth channel 357, it will be filled with low-pressure refrigerant and become a low-pressure chamber. Whether the third chamber 355 is high-pressure or low-pressure will affect the overall stress on the first valve core 340 and the second valve core 350. In this embodiment, a columnar third valve core 360 ​​is provided on the iron core 370. The third valve core 360 ​​is inserted into the second valve core 350 along the second direction. An avoidance hole is provided on the third valve core 360, which penetrates the third valve core 360 ​​radially. A limiting part 361 protrudes from the outer periphery of the third valve core 360. The third valve core 360 ​​can move relative to the second valve core 350 between a third position and a fourth position along the insertion direction. When the third valve core 360 ​​is in the third position, the limiting part 361 abuts against the second valve core 350 on the side facing the iron core 370, and the third valve core 360 ​​blocks the third channel 356, while the avoidance hole allows the fourth channel 357 to be unobstructed. When the third valve core 360 ​​is in the fourth position, the limiting part 361 abuts against the second valve core 350 on the side away from the iron core 370, and the third valve core 360 ​​blocks the fourth channel 357, while the avoidance hole allows the third channel 356 to be unobstructed. As can be seen, the iron core 370 and the third valve core 360 ​​can not only selectively open one of the third channel 356 or the fourth channel 357 while blocking the other by moving relative to the second valve core 350, but also pull or push the second valve core 350 through the limiting part 361, thereby driving the first valve core 340 to move. In this embodiment, the action of the third valve core 360 ​​driving the first valve core 340 along the first direction is called "pulling", and the action of driving the first valve core 340 along the second direction is called "pushing".

[0048] Furthermore, in this embodiment, the clearance hole includes a first clearance hole 362 and a second clearance hole 363 spaced apart along the first direction. When the third valve core 360 ​​is in the third position, the second clearance hole 363 makes the fourth channel 357 unobstructed. When the third valve core 360 ​​is in the fourth position, the first clearance hole 362 makes the third channel 356 unobstructed.

[0049] In this embodiment, the first valve core 340 and the second valve core 350 can be connected by threads. For example, the end of the second valve core 350 facing the first valve core 340 has an external thread, and the end of the first valve core 340 where the first opening 341 is located has a mating internal thread. Of course, the mating of the second valve core 350 and the first valve core 340 should not block the first opening 341. Figure 5As shown, the second valve core 350 has a limiting space for the movement of the limiting part 361, allowing the third valve core 360 ​​to move relative to the second valve core 350. Of course, this limiting space should be connected to the third chamber 355. The iron core 370 and the third valve core 360 ​​can also be connected by screwing or welding.

[0050] In this embodiment, the third valve core 360 ​​pushes and pulls the second valve core 350 to adjust the position of the first valve core 340, thereby switching the first valve core 340 between a first position and a second position. Furthermore, by providing a first channel 317, a second channel 318, a third channel 356, and a fourth channel 357, and by providing a clearance hole in the third valve core 360 ​​to cooperate with the third channel 356 and the fourth channel 357, the communication state between the third chamber 355 and the first tube 320 or the second tube 330 is different when the third valve core 360 ​​is in different positions.

[0051] By setting various channels on each valve unit 301, the specific effect that can be achieved is: when the first valve core 340 is in the first position, when the third valve core 360 ​​moves along the second direction to the fourth position to prepare to push the second valve core 350 to move in the second direction (e.g., when the third valve core 360 ​​moves along the second direction to the fourth position to prepare to push the second valve core 350 to move in the second direction, as shown in the example) Figure 5 The first tube 320 is connected to the third chamber 355 through the first chamber 353 and the third channel 356. The third chamber 355 is in a high-pressure state, which facilitates the third valve core 360 ​​to continue to move in the second direction, so as to push the first valve core 340 to move to the second position. Figure 7 This is a cross-sectional view of the valve unit 301 of the composite valve 300 in a second orientation, according to one embodiment of this application. Figure 7 As shown, when the first valve core 340 is in the second position, and the third valve core 360 ​​moves along the first direction to the third position to prepare to pull the first valve core 340 to the first position, the second tube 330 is connected to the third chamber 355 through the second chamber 354 and the fourth channel 357. This facilitates the third valve core 360 ​​to continue moving in the first direction to push the first valve core 340 to the first position. Therefore, this structure makes adjusting the position of the first valve core 340 easier.

[0052] In this embodiment, the elastic element can be disposed inside the tube shell 371, with its two ends abutting against the iron core 370 and the tube shell 371 respectively, or its two ends can abut against the second valve core 350 and the tube shell 371 respectively, so as to provide a force to the first valve core 340 in the second direction.

[0053] The stress state of valve unit 301 is different when it is in different postures. Figure 8 This is a schematic diagram of a first valve core 340 being pulled to a first position and maintained in one embodiment of this application; Figure 9This is a schematic diagram of a third valve core 360 ​​about to push the first valve core 340 to a second position in one embodiment of this application; Figure 10 This is a schematic diagram of a first valve core 340 being pushed to a second position and maintained in one embodiment of this application; Figure 11 This is a schematic diagram showing, in one embodiment of this application, the third valve core 360 ​​about to pull the first valve core 340 to a first position. Please refer to... Figures 8 to 11 , Figures 8 to 11 The marks S1 to S13 indicate the positions of various pressure-bearing surfaces. These surfaces are subjected to pressure from the gaseous refrigerant in a first or second direction, and therefore have an orientation in either the first or second direction. Specifically, S1 is the pressure-bearing surface on the iron core 370 facing the first direction; S2 is the pressure-bearing surface on the iron core 370 facing the second direction; S3 is the pressure-bearing surface at the end of the second valve core 350 facing the first direction; S4 is the pressure-bearing surface on the mounting platform of the third sealing ring 352 facing the first direction; S5 is the pressure-bearing surface on the mounting platform of the third sealing ring 352 facing the second direction; S6 is the pressure-bearing surface on the mounting platform of the second sealing ring 351 facing the first direction; and S7 is the pressure-bearing surface on the mounting platform of the second sealing ring 351. The pressure-bearing surface facing the second direction is as follows: S8 is the pressure-bearing surface of the end of the third valve core 360 ​​facing the second direction; S9 is the pressure-bearing surface of the end of the second valve core 350 facing the second direction; S10 is the pressure-bearing surface of the end of the first valve core 340 facing the first direction; S11 is the pressure-bearing surface of the mounting platform of the first sealing ring 343 facing the first direction; S12 is the pressure-bearing surface of the mounting platform of the first sealing ring 343 facing the second direction; S13 is the pressure-bearing surface of the end of the first valve core 340 facing the second direction. For ease of viewing, Figures 8-11 The reference numerals for each component are not shown in the attached diagrams; please refer to them for further information. Figure 5 and Figure 7 To understand.

[0054] exist Figure 8 In the state shown, the first valve core 340 needs to be maintained in the first position, therefore the following force relationship needs to be satisfied:

[0055] Formula (1): S1*PL-S2*PL+S3*PL+S4*PL-S5*PL+S6*PL-S7*PH-S8*PL-S9*PL+S11*PH-S12*PL-S13*PL–Fc+Fs<0;

[0056] Equation (2): Fc > Fs.

[0057] Wherein, the values ​​of S1 to S13 are the areas of the projection of each force-bearing surface onto the plane perpendicular to the first direction; Fc is the driving force from the coil on the iron core 370, in the first direction; Fs is the force of the elastic element, in the second direction; PL is the refrigerant pressure (low pressure) in the second tube 330; PH is the refrigerant pressure (high pressure) in the first tube 320.

[0058] exist Figure 9 In the state shown, the first valve core 340 needs to be pushed to the second position. At this time, the driving force of the coil has been removed, so the following force relationship needs to be satisfied:

[0059] Formula (3): S1*PH-(S2-S3)*PH+S4*PH-S5*PL+S6*PL-S7*PH-S8*PL-S9*PL+S11*PH-S12*PL-S13*PL+Fs>0.

[0060] exist Figure 10 In the state shown, the first valve core 340 needs to be maintained in the second position. At this time, there is still no coil force Fc, so the following force relationship needs to be satisfied:

[0061] Formula (4): S1*PH-(S2-S3)*PH+S4*PH-S5*PL+S6*PL-S7*PH-S8*PH-S9*PH+S10*PH+S11*PH-S12*PL+Fs>0.

[0062] exist Figure 11 In the state shown, the first valve core 340 needs to be pulled to the first position. At this time, the coil applies a driving force, so the following force relationship needs to be satisfied:

[0063] Formula (5): S1*PL-S2*PL+S3*PL+S4*PL-S5*PL+S6*PL-S7*PH-S8*PH-S9*PH+S10*PH+S11*PH-S12*PL-Fc+Fs<0.

[0064] It should be understood that pressure surfaces perpendicular to the first direction, or two pressure surfaces whose pressures cancel each other out, or extremely small surfaces, etc., are negligible because they have virtually no impact on the movement of the first valve core 340.

[0065] By directly removing the terms Fc and Fs from the inequalities in equations (1), (3) to (5), we obtain the following inequalities:

[0066] Formula (6): S1*PL-S2*PL+S3*PL+S4*PL-S5*PL+S6*PL-S7*PH-S8*PL-S9*PL+S11*PH-S12*PL-S13*PL<0;

[0067] Formula (7): S1*PH-(S2-S3)*PH+S4*PH-S5*PL+S6*PL-S7*PH-S8*PL-S9*PL+S11*PH-S12*PL-S13*PL>0;

[0068] Formula (8): S1*PH-(S2-S3)*PH+S4*PH-S5*PL+S6*PL-S7*PH-S8*PH-S9*PH+S10*PH+S11*PH-S12*PL>0;

[0069] Formula (9): S1*PL-S2*PL+S3*PL+S4*PL-S5*PL+S6*PL-S7*PH-S8*PH-S9*PH+S10*PH+S11*PH-S12*PL<0.

[0070] If Fc>Fs in equation (2), then equations (6) to (9) are true, and equations (1) and (3) to (5) are also true, and the function of valve unit 301 can be realized. Therefore, valve unit 301 can be designed according to equations (6) to (9).

[0071] In multi-split air conditioners 010, there is often a constraint that PH / PL > 1.5. Under this constraint, in one embodiment, equations (6) to (9) hold true at the following values ​​(unit: mm):

[0072] D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 15.0 12.0 3.5 16.5 12.0 18.0 12.0 3.5 11.0 8.0 15.0 11.0

[0073] Figure 12 This is a schematic diagram showing the position of the diameter dimension in a valve unit 301 according to one embodiment of this application. Figure 12 As shown, D1 is the diameter of the iron core 370, D2 is the outer diameter of the second valve core 350 in the third chamber 355, D3 is the diameter of the hole in the second valve core 350 for the third valve core 360 ​​to be inserted, D4 is the outer diameter of the third sealing ring 352, D5 is the outer diameter of the second valve core 350 in the second chamber 354, D6 is the outer diameter of the second sealing ring 351, D7 is the outer diameter of the second valve core 350 in the first chamber 353, D8 is the end diameter of the third valve core 360, D9 is the outer diameter between the first opening 341 on the first valve core 340 and the first sealing ring 343, D10 is the inner diameter of the first valve core 340 (uniform inner diameter), D11 is the outer diameter of the first sealing ring 343, and D12 is the outer diameter between the second opening 342 on the first valve core 340 and the first sealing ring 343.

[0074] Alternatively, the diameter dimensions can be varied within the following ranges:

[0075] 1.3 ≤ D4 / D12 ≤ 3.0;

[0076] 2.5≦D5 / D8≦4.0;

[0077] 1.1≦D6 / D11≦1.3.

[0078] Refer again Figure 2 In the multi-split air conditioner 010 of this application embodiment, multiple valve units 301 in the composite valve 300 are connected in series, and the connection port 314 of each valve unit 301 is connected to the corresponding indoor unit 200. When the coil generates driving force, the first pipe 320 is disconnected from the indoor unit 200, and the second pipe 330 is connected to the indoor unit 200, so the indoor unit 200 can cool; when the coil does not generate driving force, the first pipe 320 is connected to the indoor unit 200, and the second pipe 330 is disconnected from the indoor unit 200, so the indoor unit 200 can heat. However, it should be noted that when the outdoor heat exchanger 130 is at the high-pressure end, some indoor units 200 can be put into heating operation by adjusting the composite valve 300, but at least some indoor units 200 should be kept in cooling operation, and not all operating indoor units 200 should be adjusted to heating operation. If the four-way reversing valve 120 is switched so that the outdoor heat exchanger 130 is at the low-pressure end, it is not possible to achieve heating for some indoor units 200 and cooling for others by adjusting the composite valve 300. At this time, all indoor units 200 can only heat.

[0079] In summary, when the composite valve 300 provided in this embodiment is used in a multi-split air conditioner 010, the connection port 314 of the valve unit 301 is connected to the corresponding indoor unit 200. The first pipe 320 can always be connected to the exhaust side pipeline of the compressor 110 as a high-pressure pipeline, while the second pipe 330 is connected to the suction side pipeline of the compressor 110 or to the four-way reversing valve 120 as a low-pressure pipeline. By switching the position of the first valve core 340, the corresponding indoor unit 200 can be selectively connected to the first pipe 320 or the second pipe 330. When the indoor unit 200 is connected to the first pipe 320, it is at high pressure and acts as a condenser for heating; when the indoor unit 200 is connected to the second pipe 330, it is at low pressure and acts as an evaporator for cooling. In the multi-split air conditioner 010, a composite valve 300 with multiple valve units 301 is used. This allows the first valve core 340 of different valve units 301 in the composite valve 300 to be in different positions, thus enabling two indoor units 200 to simultaneously perform cooling or heating. Furthermore, compared to the prior art which uses two valves to switch between cooling and heating of one indoor unit 200, the composite valve 300 of this embodiment only requires one valve unit 301. Therefore, using this composite valve 300 simplifies piping and valves, reduces the size of the outdoor unit 100, and makes it easier to implement the cooling and heating function in the residential multi-split air conditioner 010.

[0080] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this application; therefore, the scope of protection of this application shall be determined by the scope defined in the claims.

Claims

1. A composite valve, applied to a multi-split air conditioner (010), characterized in that, The system includes a valve unit (301), which comprises a valve cylinder (310), a first valve core (340), a first tube (320), a second tube (330), and a drive assembly. The first valve core (340) is tubular, and the valve cylinder (310) is sleeved around the first valve core (340). The valve cylinder (310) has a first end and a second end opposite to each other. The first tube (320) communicates with the valve cylinder (310) at a first node (312), and the second tube (330) communicates with the valve cylinder (310) at a second node (313). The first node (312) is closer to the first end of the valve cylinder (310) than the second node (313). The second end of the valve cylinder (310) has a connection port (314) for connecting an indoor unit (200). The drive assembly is used to drive the first valve core (340) along the valve cylinder (310), the first valve core (340), the first tube (320), the second tube (330), and the drive assembly. 10) moves axially between a first position and a second position. During the movement of the first valve core (340), the inner wall of the valve cylinder (310) between the first node (312) and the second node (313) is always sealed to the outer wall of the first valve core (340). The first valve core (340) has a first opening (341) near the first end and a second opening (342) near the second end. When the first valve core (340) is in the first position, the first opening (341) is not connected to the first node (312), and the connection port (314) is connected to the second node (313). When the first valve core (340) is in the second position, the first opening (341) is connected to the first node (312), the second opening (342) is connected to the connection port (314), and the connection port (314) is not connected to the second node (313).

2. The composite valve according to claim 1, characterized in that, The valve cylinder (310) is provided with a first sealing part (315) and a second sealing part (316). The first sealing part (315) is located on the side of the first node (312) away from the second node (313), and the second sealing part (316) is located on the side of the second node (313) away from the first node (312). When the first valve core (340) is in the first position, the end face around the first opening (341) abuts against the first sealing part (315), and the first valve core (340) disengages from the second sealing part (316). When the first valve core (340) is in the second position, the end face around the first opening (341) disengages from the first sealing part (315), and the end face around the second opening (342) abuts against the second sealing part (316). The second sealing part (316) is annular so that the second opening (342) communicates with the connection port (314).

3. The composite valve according to claim 1, characterized in that, The first tube (320) and the valve cylinder (310) are cross-connected at the first node (312), and the second tube (330) and the valve cylinder (310) are cross-connected at the second node (313). The inner diameter of the valve cylinder (310) at the first node (312) and the second node (313) is greater than the outer diameter of the first valve core (340) at the corresponding position, so that the first valve core (340) cannot block the medium in the first tube (320) from passing through the first node (312) at the first position, and the first valve core (340) cannot block the medium in the second tube (330) from passing through the second node (313) at the second position.

4. The composite valve according to claim 1, characterized in that, The first valve core (340) is fitted with a first sealing ring (343), and the outer side of the first sealing ring (343) seals against the inner wall between the first node (312) and the second node (313) of the valve cylinder (310).

5. The composite valve according to claim 4, characterized in that, The first sealing ring (343) is fixed to the first valve core (340). When the first valve core (340) moves between the first position and the second position, the first sealing ring (343) slides relative to the valve cylinder (310) between the first node (312) and the second node (313).

6. The composite valve according to claim 1, characterized in that, The driving assembly includes a coil, an iron core (370), and an elastic element. The iron core (370) is drively connected to the first valve core (340). The coil is used to provide electromagnetic force to the iron core (370) to drive the iron core (370) to move along a first direction. The elastic element is used to provide a force to the first valve core (340) in a second direction. The first direction is from the second end of the valve cylinder (310) to the first end, and the second direction is from the first end of the valve cylinder (310) to the second end.

7. The composite valve according to claim 6, characterized in that, The valve cylinder (310) includes a first cylinder (311) and a second cylinder (319) connected axially. The first node (312) and the second node (313) are both located in the first cylinder (311). The second cylinder (319) is connected to the end of the first cylinder (311) near the first node (312). A first sealing part (315) is provided at the junction of the first cylinder (311) and the second cylinder (319). The first sealing part (315) is annular. The valve unit (301) also includes components disposed in the second cylinder (311). 9) The second valve core (350) is located inside the first sealing part (315). One end of the second valve core (350) passes through the first sealing part (315) and extends into the first cylinder (311), and is fixedly connected to the first valve core (340). The second valve core (350) and the first sealing part (315) are slidably sealed together so that the first cylinder (311) and the second cylinder (319) cannot communicate through the gap between the second valve core (350) and the first sealing part (315). The iron core (370) is connected to the second valve core (350).

8. The composite valve according to claim 7, characterized in that, The drive assembly includes a housing (371) that covers the end of the second cylinder (319) away from the first cylinder (311). The iron core (370) is disposed inside the housing (371). A second sealing ring (351) and a third sealing ring (352) are sleeved on the outside of the second valve core (350) and abut against the inner wall of the second cylinder (319). The second sealing ring (351) and the third sealing ring (352) divide the cavity formed by the second cylinder (319) and the housing (371) into first chambers (353) arranged sequentially along the first direction. The valve cylinder (310) is provided with a first channel (317) to connect the first chamber (353) and the first node (312). The valve unit (301) is also provided with a second channel (318) to connect the second chamber (354) and the second pipe body (330). The second valve core (350) is provided with a third channel (356) and a fourth channel (357). One end of the third channel (356) is connected to the first chamber (353), and the other end is connected to the third chamber (355). One end of the fourth channel (357) is connected to the first chamber (353). One end connects to the second chamber (354), and the other end connects to the third chamber (355); a columnar third valve core (360) is provided on the iron core (370), the third valve core (360) is inserted into the second valve core (350) along the second direction, the third valve core (360) is provided with a clearance hole, the clearance hole penetrates the third valve core (360) radially, and a limiting part (361) protrudes from the outer periphery of the third valve core (360); the third valve core (360) can be positioned relative to the second valve core (350) in the insertion direction at a third position and a fourth position. During the movement, when the third valve core (360) is in the third position, the limiting part (361) abuts against the second valve core (350) on the side facing the iron core (370), the third valve core (360) blocks the third channel (356), and the clearance hole allows the fourth channel (357) to be unobstructed; when the third valve core (360) is in the fourth position, the limiting part (361) abuts against the second valve core (350) on the side away from the iron core (370), the third valve core (360) blocks the fourth channel (357), and the clearance hole allows the third channel (356) to be unobstructed.

9. The composite valve according to claim 8, characterized in that, The first channel (317) is embedded in the first sealing part (315).

10. The composite valve according to claim 8, characterized in that, The clearance hole includes a first clearance hole (362) and a second clearance hole (363) spaced apart along the first direction. When the third valve core (360) is in the third position, the second clearance hole (363) makes the fourth channel (357) unobstructed. When the third valve core (360) is in the fourth position, the first clearance hole (362) makes the third channel (356) unobstructed.

11. The composite valve according to any one of claims 1-10, characterized in that, The composite valve (300) includes a plurality of valve units (301), the first pipe body (320) of each valve unit (301) is connected in sequence, and the second pipe body (330) of each valve unit (301) is connected in sequence.

12. A multi-split air conditioner, characterized in that, The system includes an outdoor unit (100) and multiple indoor units (200). The outdoor unit (100) includes a compressor (110) and a composite valve (300) as described in claim 11. Each valve unit (301) of the composite valve (300) corresponds to one of the indoor units (200), and each valve unit (301) is connected to the corresponding indoor unit (200) through the connection port (314). The first pipe body (320) and the second pipe body (330) of the composite valve (300) are both connected to the compressor (110), and the first pipe body (320) is connected to the exhaust side pipeline of the compressor (110) to receive gaseous refrigerant.

13. The multi-split air conditioner (010) according to claim 12, characterized in that, The outdoor unit (100) includes an outdoor heat exchanger (130) and a four-way reversing valve (120). The four ports of the four-way reversing valve (120) are respectively connected to the exhaust side pipeline of the compressor (110), the suction side pipeline of the compressor (110), the outdoor heat exchanger (130), and the second pipe body (330) of the composite valve (300).

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