Multi-connected machine refrigerant leakage detection structure and multi-connected machine air conditioning system

Abstract

The utility model provides a kind of multi-split system refrigerant leakage detection structure and multi-split system air conditioning system, and multi-split system includes at least two indoor units, and at least part indoor unit is equipped with refrigerant detection sensor inside;The air outlet side of at least part indoor unit is connected with at least one indoor unit equipped with refrigerant detection sensor by air guide pipe, and the air guide pipe is equipped with air volume regulating valve for air supply control inside;The utility model is transformed to traditional multi-split system, and air guide pipe is additionally arranged between indoor unit.The air outlet of certain indoor unit can be guided to refrigerant detection sensor inside other indoor unit by air guide pipe to detect, to effectively reduce the use number of sensor.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, and more specifically, it relates to a refrigerant leakage detection structure for multi-split air conditioning systems and multi-split air conditioning systems. Background Technology

[0002] In multi-split air conditioning systems, refrigerant is the key medium for achieving cooling or heating. However, due to various reasons (such as aging pipes, poor welding, etc.), refrigerant leaks may occur, leading to decreased system performance or even complete failure. For multi-split systems using flammable refrigerants such as R32 and R290, refrigerant leaks pose a significant safety hazard to users. Therefore, refrigerant detection sensors are installed on the indoor unit as required to detect refrigerant leaks. An effective device for detecting refrigerant leaks is crucial for ensuring the stable operation of multi-split air conditioning systems. To control costs, how to efficiently monitor refrigerant leaks using only a small number of refrigerant detection sensors has become a pressing challenge for the industry. Utility Model Content

[0003] The purpose of this utility model is to provide a refrigerant leak detection structure for multi-split air conditioning units and its supporting multi-split air conditioning system. The aim is to reduce the number of sensors used by sharing a refrigerant detection sensor among multiple indoor units, achieve cross-detection, improve the accuracy of refrigerant leak detection, and reduce after-sales risks.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a refrigerant leakage detection structure for a multi-split air conditioner. The multi-split air conditioner includes at least two indoor units, and at least some of the indoor units are equipped with refrigerant detection sensors. The air outlet side of at least some of the indoor units is connected to at least one indoor unit equipped with a refrigerant detection sensor through an air duct, and the air duct is equipped with an air volume regulating valve for air supply control.

[0006] Furthermore, the air inlet of the air duct is connected to the air outlet of one of the indoor units, and the air outlet of the air duct extends into the interior of another indoor unit and is arranged adjacent to the refrigerant detection sensor.

[0007] Furthermore, a first sealing element is installed at the connection between the air inlet end of the air duct and the air outlet duct of the indoor unit.

[0008] Furthermore, the housing of the indoor unit is provided with a through hole for the air outlet end of the air duct to extend into, and a second sealing element is installed at the position of the air outlet end of the air duct corresponding to the through hole.

[0009] Furthermore, the refrigerant detection sensor is installed inside the indoor unit and is arranged adjacent to the evaporator.

[0010] Furthermore, each indoor unit is equipped with the refrigerant detection sensor, and the air duct is provided between any two adjacent indoor units.

[0011] Furthermore, the multi-split air conditioner includes a first indoor unit equipped with a first refrigerant detection sensor and a second indoor unit equipped with a second refrigerant detection sensor. A first air duct and a second air duct are provided between the first indoor unit and the second indoor unit. The air inlet of the first air duct is connected to the air outlet of the first indoor unit, and the air outlet of the first air duct extends into the interior of the second indoor unit and is arranged adjacent to the second refrigerant detection sensor. The air inlet of the second air duct is connected to the air outlet of the second indoor unit, and the air outlet of the second air duct extends into the interior of the first indoor unit and is arranged adjacent to the first refrigerant detection sensor.

[0012] Further, the multi-split air conditioner includes a first indoor unit equipped with a first refrigerant detection sensor, a second indoor unit equipped with a second refrigerant detection sensor, and a third indoor unit equipped with a third refrigerant detection sensor. A first air duct and a second air duct are provided between the first indoor unit and the second indoor unit, and a third air duct and a fourth air duct are provided between the second indoor unit and the third indoor unit. The air inlet of the first air duct is connected to the air outlet of the first indoor unit, and the air outlet of the first air duct extends into the interior of the second indoor unit and is arranged adjacent to the second refrigerant detection sensor. The air inlet of the second air duct is connected to the air outlet of the second indoor unit, and the air outlet of the second air duct extends into the interior of the first indoor unit and is arranged adjacent to the first refrigerant detection sensor; the air inlet of the third air duct is connected to the air outlet of the second indoor unit, and the air outlet of the third air duct extends into the interior of the third indoor unit and is arranged adjacent to the third refrigerant detection sensor; the air inlet of the fourth air duct is connected to the air outlet of the third indoor unit, and the air outlet of the fourth air duct extends into the interior of the third indoor unit and is arranged adjacent to the second refrigerant detection sensor.

[0013] Furthermore, the multi-split air conditioner includes a first indoor unit equipped with a refrigerant detection sensor and a second indoor unit without a refrigerant detection sensor. The air outlet duct of the second indoor unit is connected to the air inlet end of the air duct. The air outlet end of the air duct extends into the interior of the first indoor unit and is arranged adjacent to the refrigerant detection sensor.

[0014] This utility model also provides a multi-split air conditioning system, including the multi-split refrigerant leakage detection structure as described above.

[0015] Compared with existing technologies, the beneficial effects of the multi-split air conditioning system and refrigerant leak detection structure provided by this utility model are as follows: This utility model modifies the traditional multi-split air conditioning system by adding air ducts between the indoor units. The air ducts can guide the airflow from one indoor unit to the refrigerant detection sensors inside other indoor units for detection, thereby effectively reducing the number of sensors required. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the refrigerant leakage detection structure for multi-split air conditioning systems in this utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the refrigerant leakage detection structure for multi-split air conditioning systems in this utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the refrigerant leakage detection structure for multi-split air conditioning systems in this utility model. Figure 3 ;

[0020] The main markings in the attached figures are as follows:

[0021] 1. Indoor unit; 2. Refrigerant detection sensor; 3. Air duct; 4. Air volume regulating valve; 5. Air outlet duct;

[0022] 11. First indoor unit; 12. Second indoor unit; 13. Third indoor unit;

[0023] 21. First refrigerant detection sensor; 22. Second refrigerant detection sensor; 23. Third refrigerant detection sensor;

[0024] 31. First air duct; 32. Second air duct; 33. Third air duct; 34. Fourth air duct;

[0025] 61. First sealing element; 62. Second sealing element. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In multi-split air conditioning systems, refrigerant is the key medium for achieving cooling or heating. However, due to various reasons (such as aging pipes, poor welding, etc.), refrigerant leaks may occur, leading to decreased system performance or even complete failure. For multi-split systems using flammable refrigerants such as R32 and R290, refrigerant leaks pose a significant safety hazard to users. Therefore, refrigerant detection sensors are installed on the indoor units as required to detect refrigerant leaks. An effective device for detecting refrigerant leaks is crucial for ensuring the stable operation of multi-split air conditioning systems. To effectively control costs, how to efficiently monitor refrigerant leaks with only a small number of refrigerant detection sensors has become a pressing problem in the industry. Furthermore, in practical engineering applications, false alarms from refrigerant detection sensors leading to unit shutdowns are also common. Addressing the common phenomenon of densely distributed multiple indoor units in large-scale projects, this invention proposes a refrigerant leak detection structure and a multi-split air conditioning system.

[0028] Please refer to the following: Figures 1 to 3 This utility model proposes a refrigerant leakage detection structure for a multi-split air conditioner. The multi-split air conditioner includes at least two indoor units 1, and at least some of the indoor units 1 are equipped with refrigerant detection sensors 2. The air outlet side of at least some of the indoor units 1 is connected to at least one indoor unit 1 equipped with refrigerant detection sensors 2 through an air duct 3, and the air duct 3 is equipped with an air volume regulating valve 4 for air supply control.

[0029] The refrigerant leak detection structure for multi-split air conditioners proposed in this invention modifies a traditional multi-split air conditioner by adding an air duct 3 between the indoor units 1. This air duct 3 directs the airflow from one indoor unit 1 to the refrigerant detection sensors 2 inside the other indoor units 1 for detection, effectively reducing the number of sensors required. Simultaneously, the air duct 3 is equipped with an airflow regulating valve 4. By controlling the opening and closing of the airflow regulating valve 4 and combining the detection results from the refrigerant detection sensors 2, it is possible to effectively determine which specific indoor unit 1 has a refrigerant leak problem.

[0030] In some embodiments of this utility model, the air inlet of the air duct 3 is connected to the air outlet duct 5 of one of the indoor units 1, and the air outlet of the air duct 3 extends into the interior of another indoor unit 1 and is arranged close to the refrigerant detection sensor 2.

[0031] The advantage of this design is that the refrigerant detection sensor 2 can detect the refrigerant concentration in the airflow passing nearby in real time. When a refrigerant leak occurs in one of the indoor units 1, the leaked refrigerant will be blown into the air duct 3 through the air outlet duct 5 of that indoor unit 1, and then transported to another indoor unit 1 equipped with the refrigerant detection sensor 2 through the air duct 3. Since the air outlet of the air duct 3 is located close to the refrigerant detection sensor 2, the leaked refrigerant can be quickly detected by the refrigerant detection sensor 2, thereby triggering the leak alarm mechanism. This design not only improves the detection efficiency of refrigerant leaks, but also effectively reduces the cost of using the sensor, thereby controlling the overall operating cost of the multi-split air conditioning system.

[0032] In some embodiments of this utility model, a first sealing element 61 is installed at the connection between the air inlet end of the air duct 3 and the air outlet duct 5 of the indoor unit 1. In practical applications, a through hole is opened on the side wall of the air outlet duct 5 of the indoor unit 1 so that the air inlet end of the air duct 3 can be installed at this through hole. At the same time, the first sealing element 61 is installed at the air inlet end of the air duct 3 at the position corresponding to the through hole. The first sealing element 61 is preferably a sealing rubber ring. By adding the first sealing element 61, air leakage is effectively prevented and refrigerant leakage into the room or outside is avoided, thereby improving safety.

[0033] In some embodiments of this utility model, the housing of the indoor unit 1 is provided with a through hole for the air outlet end of the air duct 3 to extend into, and a second sealing element 62 is installed at the position corresponding to the through hole at the air outlet end of the air duct 3. The second sealing element 62 is preferably a sealing rubber ring. By adding the second sealing element 62, air leakage is effectively prevented and refrigerant leakage into the room is avoided, thereby improving safety.

[0034] In some embodiments of this invention, the refrigerant detection sensor 2 is installed inside the indoor unit 1 and positioned close to the evaporator. This invention addresses the refrigerant leakage problem in the indoor unit 1. Given the relatively high refrigerant concentration near the evaporator inside the indoor unit 1, the refrigerant detection sensor 2 is positioned close to the evaporator to ensure rapid and accurate detection of refrigerant leakage.

[0035] In some embodiments of this invention, each indoor unit 1 is equipped with a refrigerant detection sensor 2, and a duct 3 is provided between any two adjacent indoor units 1. This design allows any two adjacent indoor units 1 to share the refrigerant detection sensor 2, effectively reducing the number of sensors required. Furthermore, through cross-detection and accurate judgment by multiple refrigerant detection sensors 2, the leaking indoor unit 1 can be located more accurately, thereby improving detection accuracy and effectively reducing the risk of after-sales maintenance. Simultaneously, this design effectively prevents false alarms from the refrigerant detection sensor 2, or the inability to perform refrigerant detection due to the failure of a single refrigerant detection sensor 2, further reducing safety hazards for users.

[0036] In an optional embodiment of this utility model, such as Figure 1 As shown, the multi-split air conditioner includes a first indoor unit 11 equipped with a first refrigerant detection sensor 21 and a second indoor unit 12 equipped with a second refrigerant detection sensor 22. A first air duct 31 and a second air duct 32 are provided between the first indoor unit 11 and the second indoor unit 12. The air inlet of the first air duct 31 is connected to the air outlet duct 5 of the first indoor unit 11, and the air outlet of the first air duct 31 extends into the interior of the second indoor unit 12 and is arranged adjacent to the second refrigerant detection sensor 22. The air inlet of the second air duct 32 is connected to the air outlet duct 5 of the second indoor unit 12, and the air outlet of the second air duct 32 extends into the interior of the first indoor unit 11 and is arranged adjacent to the first refrigerant detection sensor 21.

[0037] In practical applications, when each indoor unit 1 is operating in cooling or heating mode, the refrigerant circulates in the heat exchanger of the indoor unit 1. After the system is powered on, it communicates with the refrigerant detection sensor 2 every 0.2 seconds. If the refrigerant concentration is detected to be greater than or equal to 10% for 5 seconds, a leak flag is set, indicating a leak. However, due to limitations in the lifespan of electronic components, the temperature and humidity of the installation environment, and power supply parameters, the refrigerant detection sensor 2 may malfunction due to internal errors, leading to an inability to accurately determine whether a refrigerant leak has occurred. Furthermore, if a multi-split air conditioning system mistakenly detects a refrigerant leak in an indoor unit 1, the outdoor unit's shut-off valve will close, causing an abnormal system shutdown. This invention effectively solves the problem of the system being unable to detect refrigerant leaks due to the failure of the refrigerant detection sensor 2, and also avoids the problem of abnormal system shutdowns caused by false alarms from the sensor. Based on the multi-split refrigerant leak detection structure of the above embodiment, the specific refrigerant leak detection process is as follows:

[0038] If the first refrigerant detection sensor 21 of the first indoor unit 11 detects a refrigerant leak, the system will control the airflow regulating valve 4 on the first air duct 31 of the first indoor unit 11 to open, directing the airflow from the first indoor unit 11 to the vicinity of the second refrigerant detection sensor 22 of the second indoor unit 12. If the second refrigerant detection sensor 22 of the second indoor unit 12 also detects a refrigerant leak, it is determined that the first indoor unit 11 has a refrigerant leak, and the airflow regulating valve 4 on the first air duct 31 will close after 30 seconds.

[0039] When the second refrigerant detection sensor 22 of the second indoor unit 12 detects a refrigerant leak, the system will control the airflow regulating valve 4 on the second air duct 32 of the second indoor unit 12 to open, directing the airflow from the second indoor unit 12 to the vicinity of the first refrigerant detection sensor 21 of the first indoor unit 11. If the first refrigerant detection sensor 21 of the first indoor unit 11 simultaneously detects a refrigerant leak, the airflow regulating valve 4 on the second air duct 32 will close after 30 seconds. At this time, if the first refrigerant detection sensor 21 of the first indoor unit 11 resets and no longer alarms, it is determined that there is a refrigerant leak in the second indoor unit 12. If the first refrigerant detection sensor 21 of the first indoor unit 11 does not detect a refrigerant leak, the system will send a self-test command to the second refrigerant detection sensor 22 of the second indoor unit 12. If the self-test is successful and there is no error, the second refrigerant detection sensor 22 will reset and re-detect; if the second detection still alarms, it is determined that there is a refrigerant leak in the second indoor unit 12.

[0040] Therefore, this invention, by adding multiple air ducts 3 between two indoor units 1, can direct the airflow from one indoor unit 1 to the refrigerant detection sensor 2 of its adjacent indoor unit 1 for detection. Through the cross-detection control method of multiple refrigerant detection sensors 2, the accuracy of refrigerant leak detection is effectively improved.

[0041] In an optional embodiment of this utility model, such as Figure 2 As shown, the multi-split air conditioner includes a first indoor unit 11 equipped with a first refrigerant detection sensor 21, a second indoor unit 12 equipped with a second refrigerant detection sensor 22, and a third indoor unit 13 equipped with a third refrigerant detection sensor 23. A first air duct 31 and a second air duct 32 are provided between the first indoor unit 11 and the second indoor unit 12, and a third air duct 33 and a fourth air duct 34 are provided between the second indoor unit 12 and the third indoor unit 13. The air inlet of the first air duct 31 is connected to the air outlet duct 5 of the first indoor unit 11, and the air outlet of the first air duct 31 extends into the interior of the second indoor unit 12 and is adjacent to the second refrigerant detection sensor. The first indoor unit 11 is arranged as follows: the air inlet of the second air duct 32 is connected to the air outlet duct 5 of the second indoor unit 12, and the air outlet of the second air duct 32 extends into the interior of the first indoor unit 11 and is arranged adjacent to the first refrigerant detection sensor 21; the air inlet of the third air duct 33 is connected to the air outlet duct 5 of the second indoor unit 12, and the air outlet of the third air duct 33 extends into the interior of the third indoor unit 13 and is arranged adjacent to the third refrigerant detection sensor 23; the air inlet of the fourth air duct 34 is connected to the air outlet duct 5 of the third indoor unit 13, and the air outlet of the fourth air duct 34 extends into the interior of the third indoor unit 11 and is arranged adjacent to the second refrigerant detection sensor 22.

[0042] Based on the multi-split air conditioning refrigerant leak detection structure of the above embodiment, taking the determination of whether the second indoor unit 12 has leaked as an example, the specific refrigerant leak detection process is as follows:

[0043] When the second refrigerant detection sensor 22 of the second indoor unit 12 detects a refrigerant leak, the airflow regulating valve 4 on the second air duct 32 of the second indoor unit 12 will open, while the airflow regulating valve 4 on the third air duct 33 of the third indoor unit 13 will close, so that the air outlet of the second indoor unit 12 is directed to the first refrigerant detection sensor 21 of the first indoor unit 11 for detection. If the first refrigerant detection sensor 21 of the first indoor unit 11 also detects a refrigerant leak simultaneously, the airflow regulating valve 4 on the second air duct 32 of the second indoor unit 12 will close after 30 seconds. At this time, if the first refrigerant detection sensor 21 of the first indoor unit 11 resets and no longer alarms, it is determined that there is a refrigerant leak in the second indoor unit 12; otherwise, if the first refrigerant detection sensor 21 of the first indoor unit 11 does not detect a refrigerant leak, a self-test command is sent to the second refrigerant detection sensor 22 of the second indoor unit 12. If the self-test is successful and there is no error, the second refrigerant detection sensor 22 will reset and re-detect. If the alarm still sounds after a second test, it is determined that there is a refrigerant leak in the second indoor unit 12.

[0044] If the second detection still does not trigger an alarm, the airflow regulating valve 4 on the second air duct 32 of the second indoor unit 12 will close, and the airflow regulating valve 4 on the third air duct 33 will open, directing the airflow from the second indoor unit 12 to the third refrigerant detection sensor 23 of the third indoor unit 13 for detection. If the third refrigerant detection sensor 23 of the third indoor unit 13 simultaneously detects a refrigerant leak, the airflow regulating valve 4 on the third air duct 33 of the second indoor unit 12 will close after 30 seconds. At this time, if the third refrigerant detection sensor 23 of the third indoor unit 13 resets and no longer triggers an alarm, it is determined that there is a refrigerant leak in the second indoor unit 12; if the third refrigerant detection sensor 23 of the third indoor unit 13 does not detect a refrigerant leak, a self-test command will be sent again to the second refrigerant detection sensor 22 of the second indoor unit 12. If the self-test is successful and there is no error, the second refrigerant detection sensor 22 will reset and re-detect. If the second detection still triggers an alarm, it is determined that there is a refrigerant leak in the second indoor unit 12.

[0045] Therefore, this invention, by adding multiple air ducts 3 between the three indoor units 1, can direct the airflow from one indoor unit 1 to the refrigerant detection sensor 2 of its adjacent indoor unit 1 for detection. Through the cross-detection control method of multiple refrigerant detection sensors 2, the accuracy of refrigerant leak detection is effectively improved.

[0046] In an optional embodiment of this utility model, such as Figure 3As shown, the multi-split air conditioner includes a first indoor unit 11 equipped with a refrigerant detection sensor 2 and a second indoor unit 12 without a refrigerant detection sensor 2. The air outlet duct 5 of the second indoor unit 12 is connected to the air inlet end of the air duct 3. The air outlet end of the air duct 3 extends into the interior of the first indoor unit 11 and is arranged close to the refrigerant detection sensor 2.

[0047] For applications where refrigerant detection accuracy is not critical, two adjacent indoor units 1 can share a single refrigerant detection sensor 2. Specifically: the refrigerant detection sensor 2 of the second indoor unit 12 is removed, an opening is made in the side wall of the air outlet duct 5 of the second indoor unit 12, and the air duct 3 is led to the vicinity of the refrigerant detection sensor 2 inside the first indoor unit 11. If the refrigerant detection sensor 2 of the first indoor unit 11 detects a refrigerant leak, the airflow regulating valve 4 on the air duct 3 of the second indoor unit 12 will close. If the refrigerant detection sensor 2 of the first indoor unit 11 resets and no longer alarms, it is determined that there is a refrigerant leak in the second indoor unit 12. A self-test command is sent to the refrigerant detection sensor 2. If the self-test is successful and there are no errors, the sensor will reset and re-detect. If the second detection still triggers an alarm, it is determined that there is a refrigerant leak in the first indoor unit 11.

[0048] This utility model also proposes a multi-split air conditioning system, including the multi-split refrigerant leak detection structure as described above. Because the multi-split refrigerant leak detection structure proposed in this utility model modifies a traditional multi-split system and adds an air duct 3 between adjacent indoor units 1, connecting the air outlet ducts 5 of different indoor units 1 to the refrigerant detection sensors 2, the air outlet of one indoor unit 1 is guided through the air duct 3 to the refrigerant detection sensor 2 of its adjacent indoor unit 1 for detection, thereby producing at least one of the following beneficial effects: 1) The air outlet of adjacent indoor units 1 can be guided to the same refrigerant leak sensor, reducing the number of sensors used; 2) Multiple refrigerant detection sensors 2 can be interconnected through the air duct 3, enabling multi-sensor joint judgment of leaks, improving detection accuracy, and reducing after-sales maintenance risks; 3) It effectively prevents false alarms from the refrigerant detection sensor 2 or the inability to perform refrigerant detection due to the failure of a single sensor, reducing user safety hazards.

[0049] In the description of this utility model, it should be understood that, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0050] Furthermore, the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-split air conditioner refrigerant leakage detection structure, the multi-split air conditioner comprising at least two indoor units, characterized in that, At least some of the indoor units are equipped with refrigerant detection sensors; the air outlet side of at least some of the indoor units is connected to at least one indoor unit equipped with a refrigerant detection sensor via an air duct, and the air duct is equipped with an air volume regulating valve for air supply control.

2. The multi VRF refrigerant leakage detection structure of claim 1, wherein, The air inlet of the air duct is connected to the air outlet of one of the indoor units, and the air outlet of the air duct extends into the interior of another indoor unit and is arranged adjacent to the refrigerant detection sensor.

3. The multi VRF refrigerant leakage detection structure according to claim 2, wherein A first sealing element is installed at the connection between the air inlet end of the air duct and the air outlet duct of the indoor unit.

4. The multi VRF refrigerant leakage detection structure according to claim 2, wherein The indoor unit has a through hole on its housing for the air outlet end of the air duct to extend into, and a second sealing element is installed at the air outlet end of the air duct corresponding to the position of the through hole.

5. The multi VRF refrigerant leakage detection structure according to claim 1, wherein The refrigerant detection sensor is installed inside the indoor unit and is located close to the evaporator.

6. The multi-split system refrigerant leakage detection structure according to any one of claims 1-5, wherein, Each indoor unit is equipped with the refrigerant detection sensor, and the air duct is provided between any two adjacent indoor units.

7. The multi VRF refrigerant leakage detection structure according to claim 6, wherein The multi-split air conditioner includes a first indoor unit equipped with a first refrigerant detection sensor and a second indoor unit equipped with a second refrigerant detection sensor. A first air duct and a second air duct are provided between the first indoor unit and the second indoor unit. The air inlet of the first air duct is connected to the air outlet of the first indoor unit, and the air outlet of the first air duct extends into the interior of the second indoor unit and is arranged adjacent to the second refrigerant detection sensor. The air inlet of the second air duct is connected to the air outlet of the second indoor unit, and the air outlet of the second air duct extends into the interior of the first indoor unit and is arranged adjacent to the first refrigerant detection sensor.

8. The multi VRF refrigerant leakage detection structure according to claim 6, wherein The multi-split air conditioner includes a first indoor unit equipped with a first refrigerant detection sensor, a second indoor unit equipped with a second refrigerant detection sensor, and a third indoor unit equipped with a third refrigerant detection sensor. A first air duct and a second air duct are provided between the first indoor unit and the second indoor unit, and a third air duct and a fourth air duct are provided between the second indoor unit and the third indoor unit. The air inlet of the first air duct is connected to the air outlet of the first indoor unit, and the air outlet of the first air duct extends into the interior of the second indoor unit and is arranged adjacent to the second refrigerant detection sensor. The air inlet of the third air duct is connected to the air outlet of the second indoor unit, and the air outlet of the second air duct extends into the interior of the first indoor unit and is arranged adjacent to the first refrigerant detection sensor; the air inlet of the third air duct is connected to the air outlet of the second indoor unit, and the air outlet of the third air duct extends into the interior of the third indoor unit and is arranged adjacent to the third refrigerant detection sensor; the air inlet of the fourth air duct is connected to the air outlet of the third indoor unit, and the air outlet of the fourth air duct extends into the interior of the third indoor unit and is arranged adjacent to the second refrigerant detection sensor.

9. The multi-split system refrigerant leakage detection structure according to any one of claims 1-5, wherein, The multi-split air conditioner includes a first indoor unit equipped with a refrigerant detection sensor and a second indoor unit without a refrigerant detection sensor. The air outlet duct of the second indoor unit is connected to the air inlet end of the air duct. The air outlet end of the air duct extends into the interior of the first indoor unit and is arranged adjacent to the refrigerant detection sensor.

10. A multi-split air conditioning system, characterized in that, Includes the refrigerant leak detection structure for multi-split air conditioning systems as described in any one of claims 1-9.

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