A high static pressure type horizontal concealed air conditioning fan coil unit

Abstract

This utility model belongs to the field of air conditioning fan coil unit technology, and in particular, a high static pressure horizontal concealed air conditioning fan coil unit. Addressing the problems of existing fan assembly maintenance requiring the disassembly of numerous parts and being difficult to operate, as well as the cumbersome coil cleaning process affecting heat exchange efficiency, the following solution is proposed: It includes a housing, with a fixed plate inside dividing it into compartment I and compartment II. The coil is inclinedly installed in compartment I. In compartment II, a mounting plate with the fan assembly is installed via a sliding component. Both the mounting plate and the fixed plate have ventilation openings. The bottom of the housing has a maintenance port with a sealed cover, and a self-cleaning component including a spray pipe and a micro water pump. In this utility model, the sliding structure of the mounting plate enables convenient maintenance of the fan assembly, the filtered condensate automatically cleans the coil, and the double locking of wedge blocks and limit blocks ensures installation stability, effectively improving maintenance efficiency, maintaining heat exchange performance, and ensuring equipment operational reliability.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning fan coil unit technology, and in particular to a high static pressure type horizontal concealed air conditioning fan coil unit. Background Technology

[0002] High static pressure horizontal concealed air conditioning fan coil units, as terminal heat exchange equipment of central air conditioning systems, are widely used in concealed ceiling installation scenarios in commercial buildings, residences and other places. They mainly use an internal fan to drive airflow, so that the air exchanges heat with the coil and then delivers air over long distances at high static pressure to meet the temperature regulation needs of different spaces. The equipment usually includes core components such as a housing, coil, fan, and condensate tray. The condensate tray is used to collect the condensate generated during the operation of the coil to prevent condensate leakage from affecting the surrounding structure.

[0003] However, existing high static pressure horizontal concealed air conditioning fan coil units have many shortcomings in practical use: on the one hand, the fan components are mostly fixed inside the casing. Since they are horizontally concealed in the ceiling, a large number of casing parts need to be disassembled during maintenance, resulting in limited operating space and low maintenance efficiency; on the other hand, the coil fins are prone to dust accumulation after long-term use, affecting heat exchange efficiency. Cleaning requires disassembling the unit for manual processing, which is cumbersome. Therefore, I have proposed a high static pressure horizontal concealed air conditioning fan coil unit to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the need to disassemble a large number of parts for fan component maintenance, which is difficult to operate, and the tedious cleaning of the coil which affects heat exchange efficiency. Therefore, this invention proposes a high static pressure type horizontal concealed air conditioning fan coil unit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high static pressure horizontal concealed air conditioning fan coil unit includes a housing, a fixed plate is fixedly installed inside the housing, and the housing is divided into compartment I and compartment II by the fixed plate; the coil is fixedly installed at an angle inside compartment I, and a water receiving tray is fixedly connected to the bottom of compartment I at the bottom of the housing, and an exhaust port connected to compartment I is opened on one side of the housing. The bottom of the box has an inspection port at compartment II. A sealing cover is installed at the inspection port. An air inlet is provided on the sealing cover. Both the air inlet and the air outlet are equipped with filters. One side of the fixed plate is slidably mounted on an installation plate inside the compartment II via a sliding assembly. A fan assembly is fixedly mounted on one side of the installation plate. The fan assembly includes two symmetrically fixed impellers and a dual-shaft motor that drives the two impellers to rotate. Ventilation openings are provided on both the installation plate and the fixed plate, and the ventilation openings are connected to the compartment I. A junction box is provided on one side of the enclosure; The mounting plate is provided with a fixing component for fixing it to the fixing plate; The interior of compartment I is equipped with a self-cleaning component for cleaning the coils.

[0006] In one possible design, the sliding assembly includes two guide rails, both of which are fixedly mounted on one side of the fixed plate located in compartment II. Each of the two guide rails has a groove on the side that is close to each other, and a slider is slidably mounted inside each groove. The two sliders are respectively fixedly connected to the two sides of the mounting plate.

[0007] In one possible design, two dampers are symmetrically and rotatably mounted on the inner wall of the side of the compartment II away from the fixed plate, and the push rod ends of the two dampers are rotatably connected to one side of the mounting plate through a rotating seat.

[0008] In one possible design, the fixing assembly includes a fixing block, a limiting block, a spring, and a fixing bolt. The fixing block passes through and is fixed to the fixing plate, and a sliding cavity is formed on the side of the fixing block near the mounting plate. The limiting block is slidably disposed in the sliding cavity. The spring is disposed in the sliding cavity, and its two ends abut against the limiting block and the inner wall of the sliding cavity, respectively. The fixing bolt is threadedly connected to the mounting plate. When the mounting plate moves to the working position, the limiting block pops out under the action of the spring and abuts against the bottom of the mounting plate. The fixing bolt is threadedly connected to a threaded hole formed in the fixing plate.

[0009] In one possible design, two wedge blocks are symmetrically fixed on one side of the fixing plate above the mounting plate, and the top of the mounting plate is provided with wedge grooves that fit the two wedge blocks; when the mounting plate moves to the working position, the two wedge blocks are inserted into the corresponding wedge grooves.

[0010] In one possible design, the top outer wall of the sealing cover is provided with multiple buckles, and the outer wall of the housing is provided with locking blocks that cooperate with the multiple buckles.

[0011] In one possible design, the self-cleaning component includes a spray pipe and a micro water pump; the spray pipe is fixedly installed inside compartment I and located above the coil, with multiple nozzles evenly spaced at its bottom facing the coil; the micro water pump is fixedly installed on one side of the housing, its inlet is connected to the inside of the water receiving tray via connecting pipe I, and its outlet is connected to the spray pipe via connecting pipe II; a float level sensor is installed inside the water receiving tray.

[0012] In one possible design, a filter box is fixedly installed inside the water receiving tray, which divides the inside of the water receiving tray into a buffer storage chamber and a water collection chamber; the water collection chamber is connected to compartment I, the connecting pipe I is connected to the buffer storage chamber, and the float level sensor is installed inside the buffer storage chamber; the bottom of the water receiving tray is provided with a drain outlet that communicates with the water collection chamber, and a sealing plug is provided at the drain outlet.

[0013] In this application, when the equipment is running, the dual-shaft motor drives two impellers to rotate. Outside air enters chamber II through the air inlet of the sealed cover. Most of the impurities in the air are filtered out by the filter screen at the air inlet. Then, the air enters chamber I through the ventilation holes aligned on the mounting plate and the fixed plate. The air entering chamber I comes into full contact with the inclined coils for heat exchange. The air that has completed heat exchange is discharged from the exhaust port on one side of the box under the high static pressure generated by the impellers, thereby achieving indoor air temperature regulation, ensuring long-distance air supply effect, and meeting the space temperature requirements. During operation, the condensate produced by the coils falls into the water collection tray below. The condensate in the water collection chamber is filtered by the filter box and then enters the buffer storage chamber for temporary storage. When maintenance of the fan assembly is required, pull the buckle on the sealing cover to separate it from the locking block on the housing and open the sealing cover. Then, unscrew the fixing bolts on the mounting plate and press the limit block to retract it into the sliding cavity of the fixing block on the fixing plate. Pull the mounting plate down, and the sliders on both sides of the mounting plate will slide along the guide rail grooves on the fixing plate. At this time, the damper push rod on the inner wall of chamber II will extend, slowing down the pulling speed of the mounting plate and preventing it from hitting the surrounding structure too quickly, thus improving operational safety. After maintenance, push the mounting plate back into chamber II. The wedge groove on the top of the mounting plate will cooperate with the wedge block on the fixing plate, allowing the mounting plate to gradually fit against the fixing plate. At the same time, the limit block in the sliding cavity of the fixing block on the fixing plate will pop out under the action of the spring force and abut against the bottom of the mounting plate to achieve initial positioning. Finally, tighten the fixing bolts to further fix the mounting plate and the fixing plate, ensuring the stability of the mounting plate and preventing shaking during operation. Finally, close the sealing cover and fasten the buckle to complete the maintenance.

[0014] When the condensate in the buffer storage chamber of the water receiving pan reaches the threshold set by the float level sensor, the micro water pump starts. The condensate in the buffer storage chamber enters the micro water pump through connecting pipe I, and then is transported to the spray pipe in chamber I through connecting pipe II. Multiple nozzles at the bottom of the spray pipe spray the condensate evenly onto the surface of the coil, rinsing the coil fins, removing the dust accumulated on the fins, and maintaining the heat exchange efficiency of the coil. The rinsing wastewater flows back to the water collection chamber of the water receiving pan along the coil, and the drain outlet connected to the water collection chamber can periodically discharge the wastewater.

[0015] Beneficial effects: In this utility model, the high static pressure horizontal concealed air conditioning fan coil unit divides the housing into compartment I and compartment II by a fixing plate. The fan assembly is installed on a mounting plate that can move along the sliding assembly. During maintenance, it is only necessary to disassemble the fixing assembly and open the snap-on sealing cover to pull the mounting plate along the guide rail for removal. There is no need to disassemble a large number of housing parts. It is suitable for the narrow maintenance space in the ceiling, which greatly reduces the difficulty of maintenance operation and improves maintenance efficiency. At the same time, the damper can slow down the movement speed of the mounting plate and avoid impact when pulling out or pushing in. In this utility model, a high static pressure horizontal concealed air conditioning fan coil unit is divided into a buffer storage chamber and a water collection chamber through a filter box. After condensate is filtered, it enters the buffer storage chamber. The float level sensor can sense the water volume and control the micro water pump to start, which delivers the water to the spray pipe. The water is evenly sprayed onto the surface of the coil through multiple nozzles, realizing the self-cleaning of the fins. There is no need for manual disassembly and cleaning of the fins, avoiding dust accumulation that affects the heat exchange efficiency. At the same time, it makes full use of the condensate that was originally directly discharged, reducing resource waste. In this utility model, a high static pressure horizontal concealed air conditioning fan coil unit is fixed to the mounting plate by adopting a double fixing structure of wedge blocks, limit blocks, and fixing bolts. When the mounting plate is pushed back into the compartment II, the wedge blocks insert into the corresponding wedge grooves, so that the mounting plate fits tightly against the fixing plate. The limit blocks pop out under the action of springs and abut against the bottom of the mounting plate, and are then locked by fixing bolts to ensure the stability of the mounting plate position, avoid shaking during operation, maintain the static pressure stability of the equipment during operation, reduce the operating noise caused by component shaking, and improve the overall operating reliability of the equipment. In this invention, the sliding mounting plate structure allows the fan assembly to be easily moved out of the housing for maintenance, adapting to narrow ceiling spaces and reducing operational difficulty; the filtered condensate is automatically cleaned by a spray system to clean the coil fins, improving heat exchange efficiency and enabling water recycling; a dual locking mechanism using wedge blocks and limit blocks ensures that the mounting plate fits tightly and operates without shaking after resetting, effectively guaranteeing the static pressure stability and overall reliability of the equipment. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a high static pressure horizontal concealed air conditioning fan coil unit proposed in this utility model.

[0017] Figure 2 This is a partial exploded three-dimensional structural diagram of a high static pressure horizontal concealed air conditioning fan coil unit proposed in this utility model.

[0018] Figure 3 This is a partial exploded three-dimensional structural diagram of a high static pressure horizontal concealed air conditioning fan coil unit proposed in this utility model.

[0019] Figure 4This is a partial cross-sectional three-dimensional structural diagram of the fixing block for a high static pressure horizontal concealed air conditioning fan coil unit proposed in this utility model.

[0020] Figure 5 This is a three-dimensional structural diagram of the water receiving tray for a high static pressure horizontal concealed air conditioning fan coil unit proposed in this utility model.

[0021] In the diagram: 1. Housing; 2. Fixing plate; 3. Coil; 4. Mounting plate; 5. Fan wheel; 6. Dual-shaft motor; 7. Sealing cover; 8. Junction box; 9. Water tray; 10. Guide rail; 11. Slider; 12. Damper; 13. Limit block; 14. Fixing block; 15. Spring; 16. Spray pipe; 17. Miniature water pump; 18. Filter box; 19. Wedge block; 20. Filter screen; 22. Buckle; 23. Fixing bolt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In one embodiment: Refer to Figure 1-5 An air conditioning fan coil unit includes a housing 1. A fixing plate 2 is fixedly installed inside the housing 1, dividing the interior of the housing 1 into compartment I and compartment II. This partitioning allows for the orderly arrangement of various functional components within the unit, while also providing reasonable space for subsequent maintenance and airflow. A coil 3 is fixedly installed at an angle inside compartment I. The angled arrangement of the coil 3 increases the contact area with the air, facilitating thorough heat exchange. A water collection tray 9 is fixedly connected to the bottom of compartment I at the bottom of the housing 1. The water collection tray 9 collects condensate generated during the operation of the coil 3, preventing condensate leakage to the outside of the housing 1 and its impact on surrounding structures. The enclosure 1 has an exhaust vent connected to compartment I on one side. The bottom of the enclosure 1 has an opening for easy maintenance at compartment II. A sealing cover 7 is fitted into the opening, and an air inlet is provided on the sealing cover 7. Both the air inlet and the exhaust vent are equipped with filters 20. The filters 20 can filter out impurities in the air and prevent impurities from entering the enclosure 1 and contaminating the coil 3 or affecting the operation of the fan assembly. A junction box 8 is provided on one side of the enclosure 1. The junction box 8 is used to connect the equipment to the external circuit and provide power support for the operation of the equipment.

[0024] A sliding assembly is installed inside the compartment II on one side of the fixed plate 2. The sliding assembly includes two guide rails 10, which are vertically fixed on one side of the fixed plate 2 located in the compartment II. The two guide rails 10 are provided with grooves on the sides that are close to each other. Sliding sliders 11 are slidably installed inside the two grooves. The two sliding sliders 11 are fixedly connected to the two sides of the mounting plate 4 respectively. Through the cooperation of the sliding sliders 11 and the grooves, the mounting plate 4 can slide along the length of the guide rails 10. During subsequent maintenance, it is not necessary to disassemble a large number of shell parts. It can be moved out of the compartment II by sliding the mounting plate 4, which is suitable for the narrow maintenance space inside the ceiling. Two impellers 5 are symmetrically fixed on one side of the mounting plate 4. A dual-shaft motor 6 is fixed between the two impellers 5 on one side of the mounting plate 4. The output shaft of the dual-shaft motor 6 is connected to the impellers 5, and the dual-shaft motor 6 can drive the two impellers 5 to rotate synchronously. Ventilation openings are provided on both the mounting plate 4 and the fixed plate 2, and the ventilation openings are connected to the chamber I. When the equipment is running, the dual-shaft motor 6 drives the two impellers 5 to rotate. Outside air enters the chamber II through the air inlet on the sealing cover 7. After the air is filtered by the filter screen 20 at the air inlet to remove impurities, it enters the chamber I through the ventilation openings aligned on the mounting plate 4 and the fixed plate 2. The air entering the chamber I comes into full contact with the inclined coil 3 for heat exchange. The air that has completed the heat exchange is discharged from the exhaust port on one side of the box 1 under the action of the high static pressure generated by the impellers 5, thereby achieving indoor air temperature regulation.

[0025] The mounting plate 4 is provided with a fixing component for fixing the position of the mounting plate 4. The fixing component includes a fixing block 14 that is fixedly fixed to the fixing plate 2. A sliding cavity is opened on the side of the fixing block 14 near the mounting plate 4. A limit block 13 is slidably arranged inside the sliding cavity. Two springs 15 are provided inside the sliding cavity. The two ends of the two springs 15 abut against one side of the limit block 13 and one side of the inner wall of the sliding cavity, respectively. Two fixing bolts 23 are symmetrically threaded on the mounting plate 4. Threaded holes that mate with the fixing bolts 23 are opened on the fixing plate 2. Two wedge blocks 19 are symmetrically fixed on one side of the fixing plate 2 above the mounting plate 4. A wedge groove corresponding to the two wedge blocks 19 is opened on the top of the mounting plate 4. When the mounting plate 4 moves into compartment II and its ventilation openings coincide with those on the fixed plate 2, the two wedge blocks 19 are inserted into the corresponding wedge grooves. The mounting plate 4 is pressed against the fixed plate 2 by the wedge surfaces of the wedge blocks 19. At the same time, the limiting block 13 is ejected under the elastic force of the spring 15, and the top of the limiting block 13 abuts against the bottom of the mounting plate 4. At this time, the two fixing bolts 23 are threadedly connected to the threaded holes on the fixed plate 2 respectively. The double fixing is achieved through the cooperation of the wedge blocks 19, the limiting blocks, and the fixing bolts 23, which can ensure the stability of the mounting plate 4, prevent the mounting plate 4 from shaking during equipment operation, maintain the static pressure stability during equipment operation, reduce the operating noise caused by component shaking, and improve the overall reliability of equipment operation.

[0026] Two dampers 12 are symmetrically and rotatably installed on the inner wall of the side of the chamber II away from the fixed plate 2. The push rods of the two dampers 12 are rotatably connected to one side of the mounting plate 4 through a rotating seat. When the fan assembly needs to be repaired, the mounting plate 4 is pulled to slide along the guide rail 10, and the push rod of the damper 12 extends accordingly, which can slow down the pulling speed of the mounting plate 4 and prevent the mounting plate 4 from being pulled out too quickly and hitting the surrounding structure. When the mounting plate 4 is pushed back into the chamber II after the repair is completed, the damper 12 can also slow down the pushing speed of the mounting plate 4, further avoiding the impact when pushing it in and improving the operational safety.

[0027] The top outer wall of the sealing cover 7 is provided with multiple buckles 22, and the outer wall of the housing 1 is provided with locking blocks corresponding to the multiple buckles 22. The multiple buckles 22 are engaged with the corresponding locking blocks. When it is necessary to open the sealing cover 7 for maintenance, simply move the buckle 22 to separate the buckle 22 from the locking block, and the sealing cover 7 can be removed from the opening of the housing 1. After maintenance, the sealing cover 7 is put back on the opening, and the buckles 22 and the locking blocks are re-engaged to achieve a seal. The operation is convenient and further simplifies the maintenance process.

[0028] This application can be used in the field of air conditioning fan coil unit technology, or in other fields applicable to this application.

[0029] In another embodiment: Reference Figure 3-5 An improvement based on Embodiment 1: A high static pressure horizontal concealed air conditioning fan coil unit, which is applied to the field of air conditioning fan coil unit technology. The interior of compartment I is equipped with a self-cleaning component, which includes a spray pipe 16 fixedly installed in compartment I and a miniature water pump 17 fixedly installed on one side of the housing 1. The spray pipe 16 is located above the coil 3. The bottom of the spray pipe 16 is fixedly connected with multiple nozzles facing the surface of the coil 3 at equal intervals. The inlet of the miniature water pump 17 is connected to the interior of the water receiving tray 9 through connecting pipe I, and the outlet of the miniature water pump 17 is connected to the spray pipe 16 through connecting pipe II. A filter box 18 is fixedly installed inside the water receiving tray 9. The interior of the water receiving tray 9 is divided into a buffer storage chamber and a water collection chamber through the filter box 18. The water collection chamber is connected to the chamber I, and the connecting pipe I is connected to the buffer storage chamber. A float level sensor is installed inside the water receiving tray 9, and the float level sensor is located in the buffer storage chamber. A drain outlet connected to the water collection chamber and a sealing plug are provided at the bottom of the water receiving tray 9.

[0030] However, as is well known to those skilled in the art, the working principle and wiring method of the dual-axis motor 6 are common knowledge or general knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0031] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high static pressure type horizontal concealed air conditioning fan coil unit, comprising a housing (1), characterized in that, The box (1) is fixedly provided with a fixing plate (2) inside, and the box (1) is divided into compartment I and compartment II by the fixing plate (2); a coil (3) is fixedly provided inside compartment I at an angle, and a water receiving tray (9) is fixedly connected to the bottom of compartment I at the bottom of the box (1). An exhaust port connected to compartment I is opened on one side of the box (1). The bottom of the box (1) is provided with an inspection port at the compartment II. A sealing cover (7) is installed at the inspection port. An air inlet is provided on the sealing cover (7). Both the air inlet and the air outlet are provided with filters (20). One side of the fixed plate (2) is located inside the compartment II and is slidably mounted on an installation plate (4) via a sliding assembly. A fan assembly is fixedly mounted on one side of the installation plate (4). The fan assembly includes two symmetrically fixed impellers (5) and a dual-shaft motor (6) that drives the two impellers (5) to rotate. Ventilation openings are provided on both the installation plate (4) and the fixed plate (2), and the ventilation openings are connected to the compartment I. A junction box (8) is provided on one side of the enclosure (1); The mounting plate (4) is provided with a fixing component for fixing it to the fixing plate (2); the interior of the compartment I is provided with a self-cleaning component for cleaning the coil (3).

2. A high static pressure horizontal concealed air conditioning fan coil unit according to claim 1, characterized in that, The sliding assembly includes two guide rails (10), both of which are fixedly mounted on one side of the fixed plate (2) located in the compartment II. The two guide rails (10) are provided with grooves on the sides that are close to each other. Sliding blocks (11) are slidably mounted inside the two grooves. The two sliding blocks (11) are fixedly connected to the two sides of the mounting plate (4) respectively.

3. A high static pressure horizontal concealed air conditioning fan coil unit according to claim 2, characterized in that, Two dampers (12) are symmetrically rotated on the inner wall of the side of the compartment II away from the fixed plate (2). The push rod ends of the two dampers (12) are rotatably connected to one side of the mounting plate (4) through a rotating seat.

4. A high static pressure type horizontal concealed air conditioning fan coil unit according to claim 2, characterized in that, The fixing assembly includes a fixing block (14), a limiting block (13), a spring (15), and a fixing bolt (23). The fixing block (14) passes through and is fixed on the fixing plate (2). A sliding cavity is provided on the side of the fixing block (14) near the mounting plate (4). The limiting block (13) is slidably disposed in the sliding cavity. The spring (15) is disposed in the sliding cavity, and its two ends abut against the limiting block (13) and the inner wall of the sliding cavity, respectively. The fixing bolt (23) is threadedly connected to the mounting plate (4). When the mounting plate (4) moves to the working position, the limiting block (13) pops out under the action of the spring (15) and abuts against the bottom of the mounting plate (4). The fixing bolt (23) is threadedly connected to the threaded hole opened on the fixing plate (2).

5. A high static pressure type horizontal concealed air conditioning fan coil unit according to claim 4, characterized in that, Two wedge blocks (19) are symmetrically fixed on one side of the fixing plate (2) above the mounting plate (4). The top of the mounting plate (4) is provided with a wedge groove that matches the two wedge blocks (19). When the mounting plate (4) moves to the working position, the two wedge blocks (19) are inserted into the corresponding wedge groove.

6. A high static pressure horizontal concealed air conditioning fan coil unit according to claim 1, characterized in that, The top outer wall of the sealing cover (7) is provided with multiple buckles (22), and the outer wall of the box (1) is provided with a locking block that cooperates with the multiple buckles (22).

7. A high static pressure type horizontal concealed air conditioning fan coil unit according to claim 1, characterized in that, The self-cleaning component includes a spray pipe (16) and a micro water pump (17); the spray pipe (16) is fixedly installed in the compartment I and located above the coil (3), and its bottom is connected with multiple nozzles facing the coil (3) at equal intervals; the micro water pump (17) is fixedly installed on one side of the box (1), its inlet is connected to the inside of the water receiving tray (9) through the connecting pipe I, and its outlet is connected to the spray pipe (16) through the connecting pipe II; a float level sensor is installed inside the water receiving tray (9).

8. A high static pressure type horizontal concealed air conditioning fan coil unit according to claim 7, characterized in that, The water receiving tray (9) is fixedly equipped with a filter box (18), which divides the inside of the water receiving tray (9) into a buffer storage chamber and a water collection chamber; the water collection chamber is connected to the chamber I, the connecting pipe I is connected to the buffer storage chamber, and the float level sensor is set in the buffer storage chamber; the bottom of the water receiving tray (9) is provided with a drain outlet that communicates with the water collection chamber, and a sealing plug is provided at the drain outlet.

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