Ducted air conditioner protection structure, air conditioning system and refrigerant leakage detection method

Abstract

The application provides a ducted air conditioner protection structure, an air conditioning system and a refrigerant leakage detection method. The ducted air conditioner protection structure comprises an evaporator, a shell and a main control module. The evaporator and the main control module are located inside the shell. A water pump assembly is arranged in the shell. The water pump assembly is arranged at one end of the evaporator and close to the main control module. The water pump assembly comprises a water pump and a water pump support for fixing the water pump. A refrigerant detector is arranged below the water pump support to detect whether refrigerant leakage exists inside the ducted air conditioner. The refrigerant detector is installed at the lower part of the water pump support, which can effectively save the internal space of the ducted air conditioner, reduce the volume of the ducted air conditioner, reduce the weight, reduce the cost, accurately and quickly detect whether R32 refrigerant leakage occurs, and make the refrigerant detector wiring simple and neat. The distance between the position and the main control module is short, the refrigerant detector wiring is convenient, the refrigerant detector wiring is simple and neat, and the assembly difficulty and efficiency of workers are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and in particular to a ducted air conditioner protection structure, an air conditioning system and a refrigerant leakage detection method. BACKGROUND

[0002] In the field of air conditioning, R32 is a commonly used effective refrigerant, and R32 is a flammable and explosive gas. If refrigerant leakage occurs, an explosion may occur, endangering people's life and property safety. For a ducted air conditioner, the internal space is small. How to install a refrigerant detector to effectively detect the refrigerant concentration is a problem to be solved in the field. In the prior art, the refrigerant detector in the ducted air conditioner is usually installed on the evaporator side plate, such as the second installation position shown in Figure 7 Since the refrigerant detector is at the air outlet of the ducted air conditioner, the wind pressure is large, and only the air passing through the evaporator can be detected. At this time, the R32 concentration of the air is quite different from the actual concentration. The R32 refrigerant detector at this position has poor accuracy. Moreover, the distance from the main control board is far, and the wiring is difficult, resulting in messy wiring inside the ducted air conditioner, which is difficult to sort out. Even wiring errors, missed wiring and other problems occur, which makes the product unable to work normally, resulting in rework, greatly increasing the assembly difficulty and efficiency of workers. SUMMARY

[0003] Therefore, the present application aims to provide a ducted air conditioner protection structure, an air conditioning system and a refrigerant leakage detection method to solve the problems of poor accuracy of the refrigerant detector and difficult wiring in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The application discloses a ducted air conditioner protection structure, which comprises an evaporator, a shell and a main control module, wherein the evaporator and the main control module are located inside the shell, a water pump assembly is arranged in the shell, the water pump assembly is arranged at one end of the evaporator and close to the main control module, the water pump assembly comprises a water pump and a water pump support for fixing the water pump, and a refrigerant detector is arranged below the water pump support and used for detecting whether refrigerant leakage exists in the ducted air conditioner. The refrigerant detector is installed at the lower part of the water pump support, so that the internal space of the ducted air conditioner can be effectively saved, the volume of the ducted air conditioner is reduced, the weight is reduced, and the cost is reduced; the installation position is close to the refrigerant pipeline of the evaporator of the ducted air conditioner, the corresponding evaporator refrigerant pipeline is the most at the position and is a bent pipe welding position, refrigerant leakage is most likely to occur at the position, the position is far away from the fan, the air transported from the outside has little influence on the position, and the refrigerant leakage of R32 refrigerant can be accurately and quickly detected; the position is close to the main control module, wiring of the refrigerant detector is facilitated, wiring of the refrigerant detector is simple and not messy, assembly difficulty and assembly efficiency of workers are reduced; in addition, the refrigerant detector can be integrally connected with the water pump valve plate, when the refrigerant detector fails, the water pump valve plate can be directly opened for maintenance, the convenient dismounting mode can effectively improve the maintenance efficiency, the refrigerant detector is convenient to replace, the difficulty of after-sales maintenance is greatly reduced, and the labor cost is reduced.

[0006] Further, the refrigerant detector comprises a fixing seat and a sensor, the sensor is located inside the fixing seat, a first opening is arranged on the fixing seat, and air outside the fixing seat enters the inside of the fixing seat through the first opening. When refrigerant leakage occurs, the concentration of refrigerant in the ducted air conditioner is obviously increased, and air containing refrigerant enters the inside of the fixing seat through the first opening and is detected by the sensor.

[0007] Further, a fixing foot is arranged at the edge of the fixing seat, and the fixing seat is fixedly installed below the water pump support through the fixing foot.

[0008] Further, a through hole is further arranged at the top of the fixing seat, a signal line connected with the sensor extends outwards through the through hole and is connected with the main control module. The signal line is connected with the main control module.

[0009] Further, the fixing seat comprises a lower cover and an upper cover, the lower cover and the upper cover are connected through buckling, a first opening is arranged at the connecting part of the lower cover and the upper cover, and the first opening corresponds to the position of the sensor inside.

[0010] Furthermore, support feet and positioning posts are provided inside the upper cover. The support feet are located near the four corners of the upper cover, and the positioning posts are located near the center of the upper cover. This serves to position and fix the PCB board. The positioning posts and the support feet at the four corners enable accurate installation of the PCB board.

[0011] Furthermore, an adjustment hole is provided on the water pump bracket, and the refrigerant detector is installed at the lower part of the adjustment hole. The installation angle of the refrigerant detector is adjusted with the center of the adjustment hole as a reference. The angle between the sensor of the refrigerant detector and the end face of the evaporator is -30° to 30°.

[0012] Furthermore, a volute fixing plate is provided between the water pump assembly and the main control module. The volute fixing plate is provided with wiring holes, and the signal line of the refrigerant detector passes through the wiring holes on the volute fixing plate to connect with the main control module.

[0013] Compared with existing technologies, the duct machine protection structure described in this invention has the following advantages:

[0014] Installing the refrigerant detector under the water pump bracket effectively saves internal space in the ducted air conditioner, reducing its size, weight, and cost. This installation location is close to the refrigerant lines of the evaporator, where the evaporator has the most refrigerant lines, including bends and welds, making it most prone to leaks. Furthermore, this location is far from the fan, minimizing the impact of external airflow, allowing for accurate and rapid detection of R32 refrigerant leaks. The proximity to the main control module facilitates wiring for the refrigerant detector, resulting in a clean and uncluttered design that reduces assembly difficulty and efficiency. Additionally, this installation allows for integration with the water pump valve plate; if the refrigerant detector malfunctions, the valve plate can be directly opened for repair. This convenient disassembly method significantly improves maintenance efficiency, facilitates refrigerant detector replacement, greatly reduces after-sales maintenance difficulty, and lowers labor costs.

[0015] The present invention also provides an air conditioning system, including the above-described duct unit protection structure, and an outdoor unit, wherein the duct unit protection structure is connected to the outdoor unit through a refrigerant pipeline.

[0016] The advantages of the air conditioning system and the aforementioned duct protection structure compared to existing technologies are the same, and will not be repeated here.

[0017] The present invention also provides a refrigerant leakage detection method, wherein the detection method uses the air conditioning system described above, and the detection method includes:

[0018] Obtain the refrigerant concentration inside the ducted air conditioner;

[0019] When the refrigerant concentration exceeds the threshold, the main control module will issue an alarm and send a signal to the outdoor unit to interrupt the refrigerant supply to the indoor unit.

[0020] The outdoor unit recovers refrigerant, empties the refrigerant from the evaporator of the ducted air conditioner and introduces it into the outdoor unit. This process lasts for the first preset time, and then the expansion valve of the outdoor unit's air inlet pipe is closed.

[0021] After the ducted air conditioner fan runs for the second preset time, it will be turned off to drain the remaining refrigerant inside the ducted air conditioner, and the entire air conditioning system will be shut down. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the ductwork machine described in an embodiment of the present invention;

[0023] Figure 2 This is a front view of the ductwork unit as described in an embodiment of the present invention;

[0024] Figure 3 This is a side view of the ductwork unit as described in an embodiment of the present invention;

[0025] Figure 4 for Figure 2 Sectional view of the C-plane;

[0026] Figure 5 for Figure 1 Sectional view of the middle BB plane;

[0027] Figure 6 for Figure 1 Sectional view of the EE plane;

[0028] Figure 7 This is a schematic diagram of the refrigerant detection sensor layout for the duct air conditioner according to an embodiment of the present invention;

[0029] Figure 8 for Figure 7 Sectional view of the middle BB plane;

[0030] Figure 9 for Figure 7 Sectional view of plane AA;

[0031] Figure 10 for Figure 7 Sectional view of the C-plane;

[0032] Figure 11 for Figure 1 Sectional view of the DD plane;

[0033] Figure 12 This is an axial view of the duct machine protection structure according to an embodiment of the present invention;

[0034] Figure 13 This is an exploded view of the protective structure for the ductwork unit as described in an embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of the refrigerant detector assembly according to an embodiment of the present invention;

[0036] Figure 15 This is a schematic diagram of the refrigerant detector angle adjustment according to an embodiment of the present invention;

[0037] Figure 16 The image shows the assembly structure of the refrigerant detector and the water pump as described in this embodiment of the invention.

[0038] Figure 17 This is an exploded view of the refrigerant detector assembly structure according to an embodiment of the present invention;

[0039] Figure 18 This is a schematic diagram of the fixture and sensor structure according to an embodiment of the present invention;

[0040] Figure 18a This is a top view of the mounting base and sensor described in an embodiment of the present invention;

[0041] Figure 18b This is a bottom view of the mounting base and sensor described in an embodiment of the present invention;

[0042] Figure 18c for Figure 18 Sectional view of AA;

[0043] Figure 19 This is a schematic diagram of the upper cover of the fixing base according to an embodiment of the present invention;

[0044] Figure 20 This is a schematic diagram of the lower cover of the fixing seat according to an embodiment of the present invention;

[0045] Figure 21 This is a schematic diagram of the fixing base structure according to an embodiment of the present invention;

[0046] Figure 21a for Figure 21 BB section view;

[0047] Figure 21b for Figure 21 Sectional view of AA.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100-Refrigerant detector, 1-Fixing base, 11-Lower cover, 111-First connecting ear, 12-Upper cover, 13-Sensor, 14-First opening, 15-Snap fastener, 16-Connecting part, 121-Positioning post, 122-Support foot, 123-Second connecting ear, 17-Fixing foot, 20-Signal line, 21-Through hole, 101-First mounting position, 102-Second mounting position, 103-Third mounting position, 200-Evaporator, 21-Refrigerant piping, 22-Evaporator end face, 300-Housing shell, 31-Water pump valve plate, 32-Water pump bracket, 33-Water pump, 34-Volume fixing plate, 35-Wiring hole, 36-Adjustment hole, 37-Air outlet, 400-Main control module Detailed Implementation

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In addition, the orientations involved in the following specific embodiments are briefly explained: the directions or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "top", "bottom", etc. mentioned in the embodiments refer to the orientations or positional relationships shown in the accompanying drawings, and the term "on" means directly or indirectly supported by the element.

[0051] like Figure 8 As shown, in existing ducted air conditioners, the refrigerant detector 100 is installed on the evaporator side panel, near the air outlet. This area has high air pressure, and the sensor, located here, can only detect air passing through the evaporator. The R32 concentration in the air passing through the evaporator differs significantly from the actual concentration, resulting in poor detection accuracy. Furthermore, the refrigerant detector's installation on the evaporator side panel, being far from the main control module, leads to complex wiring between the sensor and the main control module, affecting the internal structure of the ducted air conditioner.

[0052] like Figures 1-21bAs shown, the present invention provides a protective structure for a ducted air conditioner, including an evaporator 200, a housing 300, and a main control module 400. The evaporator 200 and the main control module 400 are both located inside the housing 300. A water pump assembly is also provided inside the housing 300. The water pump assembly is located at one end of the evaporator 200 and close to the main control module 400. The water pump assembly includes a water pump 33 and a water pump bracket 32 ​​for fixing the water pump 33. A refrigerant detector 100 is provided below the water pump bracket 32 ​​for detecting whether there is a refrigerant leak inside the ducted air conditioner. Installing the refrigerant detector under the water pump bracket can effectively save internal space in the ducted air conditioner, reducing its size, weight, and cost. The main cause of R32 refrigerant leakage is the welded joint of the evaporator bend. Improper welding operations, excessive internal refrigerant pressure, and internal corrosion can all lead to breakage at the welded joint, resulting in refrigerant leakage. This installation location is close to the refrigerant lines of the evaporator in the ducted air conditioner, where the most refrigerant lines (21) are located, and these are the most prone to refrigerant leakage. Furthermore, this location is far from the fan, and the fan... The external air supply has little impact on this location, enabling accurate and rapid detection of R32 refrigerant leaks. Furthermore, its proximity to the main control module facilitates efficient and uncluttered wiring for the refrigerant detector, reducing assembly difficulty and efficiency. Additionally, this installation can be integrated with the water pump valve plate; if the refrigerant detector malfunctions, the valve plate can be directly opened for repair. This convenient disassembly method significantly improves maintenance efficiency, facilitates refrigerant detector replacement, greatly reduces after-sales maintenance difficulty, and lowers labor costs.

[0053] The refrigerant detector 100 includes a mounting base 1 and a sensor 13. The sensor 13 is located inside the mounting base 1. A first opening 14 is provided on the mounting base 1, allowing outside air to enter the mounting base 1 through the first opening 14. When a refrigerant leak occurs, the refrigerant concentration inside the ducted air conditioner increases significantly. Air containing refrigerant enters the mounting base through the first opening and is detected by the sensor 13. Furthermore, the higher the concentration of R32 refrigerant gas, the greater the current generated inside the detector, which sends an R32 refrigerant leak signal to the main control module 400, triggering an alarm. Additionally, the first opening 14 is designed with an inwardly enlarged opening to facilitate faster and more accurate detection of leaking refrigerant inside the ducted air conditioner.

[0054] Preferably, a waterproof layer is wrapped around the refrigerant detector 100 to prevent condensation from causing short circuits inside the PCB board and ensure the normal operation of the refrigerant detector. More preferably, the waterproof layer is a sponge layer that is breathable and absorbent, allowing the refrigerant gas to be detected by the sensor and preventing condensation from entering the mounting base.

[0055] Furthermore, such as Figure 16As shown, the edge of the mounting base 1 is provided with fixing feet 17, and the mounting base 1 is fixedly installed below the water pump bracket 32 ​​by the fixing feet 17. Preferably, there are two fixing feet 17, located on both sides of the mounting base 1. A through hole 21 is also provided on the top of the mounting base 1, through which the signal line 20 connected to the sensor 13 extends outward and is connected to the main control module 400.

[0056] Specifically, such as Figures 16-21 As shown, the mounting base 1 includes a lower cover 11 and an upper cover 12, which are connected by a snap fastener 15. A first opening 14 is provided at the connection between the lower cover 11 and the upper cover 12, corresponding to the position of the internal sensor 13. The first opening 14 is located at the connection between the upper and lower covers to facilitate sensor installation. Furthermore, there are multiple snap fasteners 15, each including a retaining ring and a retaining block. The retaining ring is located on the edge of the lower cover 11 or the upper cover 12, and the retaining block is located on the edge of the upper cover 12 or the lower cover 11, thereby achieving pre-positioning assembly of the lower cover 11 and the upper cover 12. Further still, a through hole 21 is provided at the top of the upper cover 12, through which the signal line 20 connected to the sensor 13 extends outward.

[0057] Furthermore, a connecting portion 16 is provided at the mating area between the lower cover 11 and the upper cover 12, through which screws or other connectors are passed to further fix the upper cover and the lower cover together. Preferably, two screws or other connectors are provided, with the two connectors located on the left and right or front and rear sides of the fixing base 1, respectively.

[0058] Specifically, a first connecting ear 111 is provided on the edge of the lower cover 11, and a second connecting ear 123 is provided on the edge of the upper cover 12. The first connecting ear 111 and the second connecting ear 123 are joined together to form a connection part. The top edge of the middle part of the upper cover 12 is lower than the top edge of the second connecting ear 123, thereby creating a gap between the top of the upper cover 12 and the water pump bracket 32, which facilitates the passage of the signal line.

[0059] Support feet 122 are provided inside the upper cover 12, located near the four corners. These feet are used to securely mount the PCB board. Furthermore, positioning posts 121 are also provided inside the upper cover 12, located near the center, to position and fix the PCB board. The positioning posts and the four corner support feet ensure accurate mounting of the PCB board.

[0060] As part of the embodiments of the present invention, such as Figure 15As shown, an adjustment hole 36 is also provided on the water pump bracket 32. The refrigerant detector 100 is installed at the lower part of the adjustment hole 36. The installation angle of the refrigerant detector is adjusted with the center of the adjustment hole as a reference, thereby adjusting the angle between the refrigerant detector and the evaporator end face. Furthermore, the angle between the refrigerant detector sensor and the evaporator end face is -30° to 30°, where the evaporator end face is parallel to the water pump valve plate 31. Specifically, as... Figure 10 As shown, the angle between the refrigerant detector installation direction 104 and the evaporator end face 22 is 0°. When the refrigerant detector rotates clockwise, the angle formed by the refrigerant detector and the evaporator end face is positive. When the refrigerant detector rotates counterclockwise, it is negative. The refrigerant detector is most accurate when the angle is between -30° and 30°.

[0061] The water pump assembly also includes a water pump valve plate 31, which is perpendicular to the water pump bracket 32 ​​and is located on the outside of the water pump bracket 32. This valve plate protects the water pump and the refrigerant detector, while also facilitating the opening of the water pump valve plate for maintenance and replacement of the refrigerant detector. This convenient disassembly method can effectively improve maintenance efficiency, greatly reduce the difficulty of after-sales maintenance, and reduce labor costs.

[0062] Furthermore, a volute mounting plate 34 is provided between the water pump assembly and the main control module 400. The volute mounting plate 34 is provided with a wiring hole 35. The signal line 20 of the refrigerant detector 100 passes through the wiring hole 35 on the volute mounting plate 34 and connects to the main control module 400.

[0063] As part of an embodiment of the present invention, an air conditioning system is also provided, the air conditioning system including the duct protection structure described above.

[0064] As part of the embodiments of the present invention, a refrigerant leakage detection method is also provided. The detection method uses the air conditioning system described above and includes:

[0065] S1. Obtain the refrigerant concentration inside the ducted air conditioner;

[0066] The refrigerant detector continuously monitors the refrigerant concentration inside the duct unit. When the refrigerant concentration exceeds the threshold, it sends a signal indicating that the refrigerant concentration is too high to the main control module.

[0067] S2. When the refrigerant concentration exceeds the threshold, the main control module will issue an alarm and send a signal to the outdoor unit to interrupt the refrigerant supply to the indoor unit.

[0068] When the main control module receives a signal that the refrigerant concentration is too high, it sends a signal to the outdoor unit to interrupt the refrigerant supply to the indoor unit, causing the expansion valve of the outdoor unit's outlet pipe to close and stop supplying refrigerant to the indoor unit.

[0069] S3. The outdoor unit recovers refrigerant, empties the refrigerant from the evaporator of the ducted air conditioner and enters the outdoor unit. This process lasts for the first preset time. Then, the expansion valve of the outdoor unit's air inlet pipe is closed, so that all the refrigerant inside the evaporator of the ducted air conditioner enters the outdoor unit.

[0070] The outdoor unit recovers refrigerant, empties the refrigerant from the evaporator, and allows the refrigerant inside the evaporator to enter the outdoor unit. This process continues for a first preset time to ensure that the refrigerant inside the evaporator is completely introduced into the outdoor unit. Then, the expansion valve of the outdoor unit's intake pipe is closed.

[0071] Furthermore, the first preset time is set to 5~30s, preferably 10s.

[0072] S4. After the duct unit fan runs for the second preset time, the fan will be turned off to drain the residual refrigerant inside the duct unit, and the entire air conditioning system will be shut down and will no longer operate.

[0073] Furthermore, the second preset time is set to 5 minutes to ensure that any residual refrigerant inside the duct unit is emptied.

[0074] Test case

[0075] To fully illustrate the impact of the installation location of the refrigerant detector described in this invention on the accuracy of refrigerant detection, the detection accuracy of refrigerant detectors at different locations is analyzed and tested below.

[0076] like Figures 7-11 As shown, the position where the refrigerant detector is installed on the lower part of the water pump bracket 32 ​​is defined as the first installation position 101 (the solution of the present invention). The position where the refrigerant detector is installed on the evaporator side plate in the prior art is defined as the second installation position 102. The position where the refrigerant detector is installed near the fan outlet 37 is defined as the third installation position 103. The distance between the third installation position 103 and the fan outlet is closer than that of the first installation position 101. The air delivered by the fan from the outside has a greater impact on the third installation position 103 than on the first installation position 101. The accuracy of the R32 refrigerant detector is worse than that of the first installation position 101. That is, the third installation position 103 is the farthest from the main control board among the three solutions, making wiring difficult.

[0077] Specifically, such as Figures 7-9 As shown, sensors were installed at twelve points on the ducted air conditioner: point A, point B, point C, point D, point E, point F, point G, point H, point I, point J, point K, and point L. The average concentration detected at these twelve points was used to determine the actual concentration inside the ducted air conditioner. Then, at different concentration levels, the concentration of R32 refrigerant detected by the R32 detector at three locations was recorded. The detection results are shown in Table 1 below.

[0078] Table 1. Sensor test data at different installation locations under different concentrations.

[0079]

[0080] The data above shows that the optimal installation position for the R32 refrigerant detector is the first one. Through testing, it has been verified that the R32 refrigerant detector at the first installation position has the highest accuracy, followed by the third installation position. In the existing technology, the second installation position has the worst detection accuracy.

[0081] A total of 12 sensor points were set up as described above. The average value was then taken as the actual concentration of R32 refrigerant inside the ducted air conditioner. The angle between the R32 refrigerant sensor and the evaporator end face was adjusted at different concentrations, with the center of the circular hole on the water pump bracket as the reference. The concentrations detected by the R32 refrigerant detector at three locations were then recorded at different angles. The detection results are shown in Table 2 below:

[0082] Table 2. Sensor test data at different angles and installation positions.

[0083]

[0084] The data above shows that the sensor is most accurate when its orientation is between -30° and 30° from the evaporator end face.

[0085] While the present invention has been disclosed above, 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 the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A ducted air conditioner protection structure, comprising an evaporator (200), a shell (300) and a main control module (400), the evaporator (200) and the main control module (400) are located inside the shell (300), and a water pump assembly is also arranged in the shell (300), characterized in that, The water pump assembly is arranged at one end of the evaporator (200) and close to the main control module (400), and comprises a water pump (33) and a water pump support (32) for fixing the water pump (33). The water pump assembly further comprises a water pump valve plate (31) which is perpendicular to the water pump support (32) and arranged outside the water pump support (32). A refrigerant detector (100) is arranged below the water pump support (32) to detect whether refrigerant leakage exists in the duct type air conditioner. An adjusting hole (36) is arranged on the water pump support (32), and the refrigerant detector (100) is installed at the lower part of the adjusting hole (36) to adjust the installation angle of the refrigerant detector based on the center of the adjusting hole (36).

2. The ducted fan machine protection structure of claim 1, wherein, The refrigerant detector (100) comprises a fixing seat (1) and a sensor (13) arranged inside the fixing seat (1). A first opening (14) is arranged on the fixing seat (1) to allow air outside the fixing seat (1) to enter the inside of the fixing seat (1).

3. The ducted fan machine protection structure of claim 2, wherein, A fixing foot (17) is arranged at the edge of the fixing seat (1) to fix the fixing seat (1) below the water pump support (32).

4. The ducted fan machine protection structure of claim 2, wherein, A through hole (21) is further arranged at the top of the fixing seat (1) to allow a signal line (20) connected to the sensor (13) to extend outwardly through the through hole (21) and be connected to the main control module (400).

5. The ducted fan machine protection structure of claim 2, wherein, The fixing seat (1) comprises a lower cover (11) and an upper cover (12) connected by a buckle (15). The first opening (14) is arranged at the connecting part of the lower cover (11) and the upper cover (12) and corresponds to the position of the sensor (13) inside.

6. The ducted fan machine protection structure of claim 5, wherein, Supporting feet (122) are arranged inside the upper cover (12) close to the four corners, and a positioning column (121) is arranged inside the upper cover (12) close to the middle.

7. The ducted fan machine protection structure of claim 1, wherein, The angle between the sensor of the refrigerant detector (100) and the end face of the evaporator is -30°-30°.

8. The ducted fan machine protection structure of claim 1, wherein, A volute fixing plate (34) is further arranged between the water pump assembly and the main control module (400). The volute fixing plate (34) is provided with a wiring hole (35), and the signal line (20) of the refrigerant detector (100) passes through the wiring hole (35) of the volute fixing plate (34) to be connected to the main control module (400).

9. An air conditioning system, characterised in that, The duct type air conditioner protection structure comprises an outdoor unit, and the duct type air conditioner protection structure is connected to the outdoor unit through a refrigerant pipeline.

10. A refrigerant leakage detection method characterized by comprising: The detection method uses the air conditioning system of claim 9, and comprises: acquiring the refrigerant concentration inside the duct type air conditioner; When the refrigerant concentration exceeds the threshold, the main control module gives an alarm prompt, and the main control module sends a signal to interrupt the refrigerant delivery of the indoor unit to the outdoor unit; The outdoor unit collects fluorine, and the evaporator of the ducted air conditioner is emptied into the outdoor unit. This process lasts for a first preset time, and then the outdoor unit inlet air pipe expansion valve is closed; The ducted air conditioner fan runs for a second preset time and then the fan is turned off to empty the remaining refrigerant in the ducted air conditioner. The entire air conditioning system is turned off.

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