Insect-preventing and water-dripping-preventing air outlet at tail end of central air conditioner of exhibition hall

Abstract

The insect-preventing and water-dripping-preventing air outlet comprises an air outlet channel connected with a flange at the tail end of the central air conditioner, an airflow generator arranged in the air outlet channel and an air exhaust opening formed in the tail end of the air outlet channel, and the air exhaust opening comprises a sealing baffle, an air exhaust cover and a water collecting disc which are sequentially arranged from top to bottom; the sealing baffle plate is linked with the starting and stopping actions of the central air conditioner and closes or opens the air outlet channel; the exhaust hood is of a hood body structure with a second through opening formed in the middle, and exhaust grooves inclining upwards are formed in the periphery of the exhaust hood. The water collecting disc comprises a bottom disc and a water guide disc, the water guide disc is of a conical structure, and the upper end of the water guide disc is fixedly installed on the lower side of the second through opening of the exhaust hood through screws. By optimizing an internal airflow channel and arranging a special flow guide device, the flow direction and accumulation condition of condensate water can be accurately controlled, it can be ensured that the condensate water cannot be sprayed out, sewage is prevented from being splashed to cultural relics such as calligraphy and paintings, and the cultural relics are effectively prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the field of central air-conditioning terminal air outlets, and in particular to an insect-proof and drip-proof air outlet at the terminal of a central air-conditioning unit in an exhibition hall. Background Art

[0002] In the realm of cultural heritage and exhibition, cultural relic exhibition halls, as crucial venues for the preservation of historical memories and artistic treasures, ensure the stability of their internal environments. Cultural relics, such as paintings and calligraphy, are extremely sensitive to environmental conditions. Factors such as temperature, humidity, air cleanliness, and the presence of pests can cause irreversible damage. Currently, cultural relic exhibition halls generally utilize central air conditioning systems to regulate the indoor environment and meet the specific requirements of cultural relic preservation. However, existing central air conditioning terminal outlets present numerous practical issues, seriously compromising the safety of cultural relics.

[0003] On the one hand, existing air outlets are prone to occasional wastewater spraying during operation. During air conditioning system operation, condensation easily forms at the air outlet due to heat exchange. When the air conditioning system malfunctions, the air volume is improperly adjusted, or the ambient humidity changes suddenly, condensation may accumulate at the air outlet and spray out with fluctuations in the airflow. Once this wastewater splashes onto cultural relics such as calligraphy and paintings, it can cause the paper to become damp, deform, and mold, and the pigments to fade and smudge, greatly damaging the artistic and historical value of the artifacts.

[0004] On the other hand, the invasion of pests such as mosquitoes is also a major hidden danger of existing air outlets. Exhibition halls are typically large and have frequent personnel movements, providing an environment for mosquitoes to breed and operate. Existing air outlet designs lack effective insect prevention measures, allowing mosquitoes to easily enter the exhibition hall through the air outlets. Mosquitoes fly and linger in the exhibition hall, and may even land directly on cultural relics. Their excrement, corpses, and the pathogens they carry can cause contamination and erosion of the relics. In addition, after the mosquitoes die at the air outlet, their bodies may be blown out with the air flow and scattered around the cultural relics, affecting the display effect and preservation environment of the relics.

[0005] To address this problem, the existing technology adopts the following solutions:

[0006] 1) Add an air primary filter to the main air inlet of the air conditioning system to remove mosquitoes and large dust particles. During the operation of the air conditioner, appropriately increase the air volume and lower the cooling temperature to overcome the problem of water droplets generated at the air outlet.

[0007] 2) Install insect screens at air outlets to physically block mosquitoes from entering the exhibition hall. These screens are typically made of metal or plastic, with mesh sizes designed to block mosquitoes while minimizing airflow obstruction.

[0008] 3) Install absorbent strips made of highly absorbent materials, such as sponge strips or absorbent fiber strips, at the edge of the air outlet. When a small amount of condensation water is generated at the air outlet, the absorbent strips can absorb the water in time and prevent the condensation water from dripping.

[0009] 4) Place chemical insect repellents near the return air duct or air outlet of the air conditioning system, use the smell emitted by the insect repellent to repel mosquitoes, and reduce the possibility of mosquitoes approaching the air outlet.

[0010] 5) Install a water baffle at the air outlet. This is usually a metal or plastic plate with a certain angle, installed on the outside of the air outlet. The principle is to use the inclined plate surface to make the condensed water flow down the plate surface under the action of gravity instead of dripping directly.

[0011] Although the above solutions can prevent insects and dripping to a certain extent, they all have obvious limitations and are difficult to fundamentally solve the problem of occasional spraying of sewage and dirt (mosquito corpses and other pollutants) from the terminal air outlet of the air conditioner in the cultural relics exhibition hall.

[0012] Limitations of insect control solutions:

[0013] Primary air filters have limited filtration accuracy and may not effectively intercept tiny mosquitoes, insect eggs, and some pathogenic microorganisms. These pests could still enter the exhibition hall and pose a threat to cultural relics. Furthermore, increasing air volume and lowering cooling temperature to overcome dripping not only increases the energy consumption of the air conditioning system and increases operating costs, but also may cause significant fluctuations in temperature and humidity within the exhibition hall, which is detrimental to the long-term preservation of cultural relics.

[0014] Insect screens: Despite the carefully designed mesh size, a wide variety of mosquito species exist, and some smaller ones may still be able to slip through the mesh and enter the exhibition hall. Furthermore, insect screens easily accumulate dust and debris during use, impairing ventilation and requiring regular cleaning and maintenance, increasing management costs. Furthermore, insect screens are ineffective against mosquitoes that have already entered the air conditioning system.

[0015] Chemical repellents: The odor emitted by chemical repellents can be irritating, affecting the visitor experience. Furthermore, some repellents can damage cultural relics, such as corroding their surfaces or changing their color. Furthermore, mosquitoes may gradually adapt to the repellent's odor, causing its effectiveness to decrease over time, necessitating regular replacement of the repellent and increasing costs.

[0016] Limitations of anti-drip scheme:

[0017] Pre-filters combined with air volume and temperature control may not effectively address dripping in all situations. When humidity is extremely high, the air conditioning system experiences a serious malfunction, or air volume control deviates significantly, condensation may still accumulate at the air outlet and spray out. Furthermore, excessive air volume and temperature adjustments may affect the overall comfort level within the exhibition hall, negatively impacting visitor experience.

[0018] Water-absorbing strips: Water-absorbing strips have a limited capacity. When condensation builds up, the strips quickly become saturated and unable to absorb any more water, resulting in continued dripping. Furthermore, prolonged exposure to moisture in the strips can easily breed bacteria and mold, which can enter the exhibition hall with airflow and contaminate artifacts. Furthermore, the strips require regular inspection and replacement, increasing maintenance workload.

[0019] Water retaining plates: Water retaining plates can only guide condensed water down the plate surface, but cannot fundamentally solve the problem of condensed water. If the amount of condensed water is too large, the water retaining plates may not be able to guide the water in time, causing overflow and still causing damage to cultural relics. Summary of the Invention

[0020] The purpose of the present invention is to provide an insect-proof and drip-proof air outlet at the end of the central air-conditioning in the exhibition hall. By optimizing the internal air flow channel and setting a special diversion device, the flow direction and accumulation of condensed water can be accurately controlled to ensure that the condensed water will not spray out, but will be slowly discharged along a preset path, avoiding sewage splashing onto cultural relics such as calligraphy and paintings, and effectively preventing the cultural relics paper from getting damp, deforming, and mildewing, and the pigments from fading and blurring.

[0021] To achieve the above-mentioned object, the present invention provides the following technical solution: an insect-proof and drip-proof air outlet at the terminal of a central air conditioner in an exhibition hall, comprising an air outlet channel connected to a flange of the central air conditioner terminal, an air flow generator disposed in the air outlet channel, and an air outlet disposed at the terminal of the air outlet channel, wherein the air outlet comprises a sealing baffle, an air exhaust hood, and a water collection tray arranged in sequence from top to bottom, wherein:

[0022] The sealing baffle is linked to the opening and closing action of the central air conditioner to close or open the air outlet channel. The sealing baffle includes a housing, a sealing louver, a connecting piece, a linkage rod, a swing arm and a motor;

[0023] The exhaust hood is a hood structure with a second opening in the middle, and exhaust slots inclined upward are arranged around the exhaust hood;

[0024] The water collection tray includes a bottom tray and a water guide tray. The water guide tray is a conical structure and its upper end is fixed to the lower side of the second opening of the exhaust cover by screws. The lower end of the water guide tray is connected to the bottom tray.

[0025] Preferably, to enhance the insect-proofing effect of the air outlet and improve the flexibility of airflow regulation, the airflow generator adopts a pulse-type airflow generator. This pulse-type airflow generator can generate intermittent, high-intensity pulse airflow, which can effectively disrupt the flight trajectory of mosquitoes and meet the airflow regulation requirements in the complex environment of the exhibition hall.

[0026] Preferably, the casing is a rectangular frame with a first opening in the middle, and multiple groups of sealing louvers are arranged in the first opening of the casing. Each sealing louver is rotatably installed in the first opening through an axis rod. One side axis end of the sealing louver passes through the casing and is connected to the connecting piece, and the linkage rod is connected to the connecting pieces on multiple sealing louvers through a pin shaft.

[0027] Preferably, the motor is fixed on the outside of the casing, the motor shaft end is connected to the rocker arm, the end of the rocker arm is connected to the shaft end of the sealing baffle, the rocker arm rotates with the motor and drives the sealing louver to be open or closed through the linkage rod.

[0028] Preferably, the exhaust slots are coated with a hydrophobic coating (Teflon coating). The hydrophobic coating reduces the surface tension of the outlet surface, making it difficult for condensed water to adhere to the surface. When condensed water contacts the outlet surface coated with the hydrophobic coating, it forms water droplets and rolls off quickly under the action of gravity, rather than forming a water film or accumulating on ordinary surfaces.

[0029] Preferably, a water-blocking maze is provided in the exhaust trough. In the traditional air outlet design, condensed water may drip directly onto the ground or onto cultural relics, causing damage to the exhibition hall environment and cultural relics. The water-blocking maze of the present invention can make condensed water accumulate inside the maze, and drain the water through a reasonably designed drainage channel (such as in conjunction with a water collection tray), keeping the exhibition hall dry and tidy. The specific principle is: the water-blocking maze set in the exhaust trough has a unique design. When the wind carrying water vapor enters the exhaust trough, it will collide and turn with the water-blocking maze many times. This complex path design greatly increases the contact area and contact time between water vapor and the maze wall, so that water vapor can be fully intercepted and condensed into water droplets, effectively avoiding water vapor from being discharged directly from the air outlet with the air flow, thereby preventing sewage formed by condensation of water vapor from spraying onto calligraphy and painting cultural relics in the exhibition hall, providing reliable protection for the cultural relics.

[0030] Preferably, the lower side of the second opening cooperates with the upper end of the water accumulation tray, the upper side of the second opening is connected to the first opening, and the inner diameter of the second opening is smaller than the inner diameter of the first opening.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] By optimizing the internal airflow channel and installing a special diversion device, the present invention can precisely control the flow direction and accumulation of condensed water, ensuring that the condensed water does not spray out, but is slowly discharged along a preset path, preventing wastewater from splashing onto cultural relics such as calligraphy and paintings, effectively preventing damage to the cultural relics and protecting their artistic and historical value to the greatest extent. Specific technical effects include the following:

[0033] 1. The sealing baffle of this invention is tightly linked to the opening and closing of the central air conditioner. When the air conditioner is turned off, the sealing baffle quickly seals the air outlet duct. Its unique mechanism of coordinated operation among the housing, sealing louvers, connecting piece, linkage rod, swing arm, and motor drives the swing arm, which, through the linkage rod, drives the synchronous rotation of multiple sets of sealing louvers, forming a tight physical barrier that effectively prevents mosquitoes from entering the air outlet from outside, thus reducing the risk of mosquito infestation at the source.

[0034] 2. The exhaust hood of the present invention has a second opening in the middle and upward-angled exhaust slots around its perimeter. This unique structure not only facilitates the discharge of airflow, but also makes it more difficult for mosquitoes to enter the air outlet, making it difficult for mosquitoes to follow the airflow into the interior, further enhancing the insect-proofing effect.

[0035] 3. The present invention adopts a pulse airflow generator, which can generate intermittent, high-intensity pulse airflow. This airflow can strongly interfere with the flight trajectory of mosquitoes, making it difficult for mosquitoes to approach the air outlet. Even if mosquitoes try to approach, they will be driven away by the pulse airflow, greatly reducing the possibility of mosquitoes entering the air outlet.

[0036] 4. The water collection tray of the present invention consists of a base and a water guide tray. The water guide tray has a conical structure, with its upper end fixed to the lower side of the second opening of the exhaust hood and its lower end connected to the base. When condensed water appears at the air outlet, the water will flow into the water guide tray through the second opening of the exhaust hood, and then be guided into the base by the water guide tray, ensuring that condensed water will not accumulate at the air outlet. Even if mosquito carcasses are mixed into the condensed water, they will be collected in the water collection tray and will not be sprayed onto cultural relics such as calligraphy and paintings with the sewage, effectively preventing the erosion of cultural relics by mosquito carcasses and the pathogens they carry.

[0037] 5. The exhaust trough of the present invention is coated with a hydrophobic coating. This coating reduces the surface tension of the air outlet, making it difficult for condensed water to adhere. Condensed water quickly forms droplets upon contact with the coating and rolls off under gravity, preventing water from accumulating in the exhaust trough. This makes it difficult for mosquitoes to linger and die in waterlogged environments, reducing the likelihood of their bodies being discharged with sewage.

[0038] 6. The exhaust trough of this invention is equipped with a water-blocking labyrinth. When air carrying moisture enters the trough, it collides with the labyrinth. The labyrinth's unique structure effectively traps moisture, causing it to condense into droplets within the labyrinth rather than being discharged through the air outlet. This design prevents moisture from accumulating and dripping into condensed water within the exhibition hall. It also prevents the potential for wastewater spraying caused by direct vapor discharge, thus protecting calligraphy and paintings from erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 Schematic diagram of the overall structure of the air outlet in an embodiment of the present invention;

[0041] Figure 3 An exploded view of an exhaust vent according to an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of the structure of the sealing baffle in an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the structure of the exhaust hood in an embodiment of the present invention.

[0044] In the figure: 1. air outlet channel; 2. air flow generator; 3. air outlet; 31. sealing baffle; 311. housing; 312. sealing louver; 313. connecting piece; 314. linkage rod; 315. rocker arm; 316. motor; 32. exhaust hood; 321. exhaust slot; 33. water collection tray. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0047] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] See also Figure 1 The present invention provides a technical solution: an insect-proof and drip-proof air outlet at the terminal of the central air-conditioning in an exhibition hall, comprising an air outlet channel 1 connected to the flange of the terminal of the central air-conditioning, an air flow generator 2 arranged in the air outlet channel 1, and an exhaust port 3 arranged at the end of the air outlet channel 1.

[0049] In this embodiment, to enhance the insect-proofing effect of the air outlet and improve the flexibility of airflow regulation, the airflow generator 2 adopts a pulsed airflow generator. This pulsed airflow generator can generate intermittent, high-intensity pulsed airflow, which can effectively disrupt the flight paths of mosquitoes and meet the airflow control requirements in the complex environment of the exhibition hall.

[0050] See also Figure 2 、 Figure 3 、 Figure 4 In this embodiment, the exhaust outlet 3 includes a sealing baffle 31, an exhaust cover 32 and a water collection tray 33 arranged in sequence from top to bottom, wherein: the sealing baffle 31 is linked to the opening and closing action of the central air conditioner and seals or opens the air outlet channel 1, and the sealing baffle 31 includes a casing 311, a sealing louver 312, a connecting piece 313, a linkage rod 314, a rocker arm 315 and a motor 316; the casing 311 is a rectangular frame with a first opening in the middle, and a plurality of sealing louvers 312 are arranged in the first opening of the casing 311, and each sealing louver 312 is rotatably installed in the first opening by an axis rod, and one side shaft end of the sealing louver 312 passes through the casing 311 and is connected to the connecting piece 313, and the linkage rod 314 is connected to the connecting pieces 313 on the plurality of sealing louvers 312 through a pin shaft. The motor 316 is fixed to the outside of the housing 311, the shaft end of the motor 316 is connected to the rocker arm 315, the end of the rocker arm 315 is connected to the shaft end of the sealing baffle 31, and the rocker arm 315 rotates with the motor 316 and drives the sealing louver 312 to be open or closed through the linkage rod 314.

[0051] In traditional air outlet designs, mosquitoes can enter and be ejected with the airflow when the air conditioner is turned on, damaging paintings, calligraphy, and other cultural relics within the exhibition hall. However, the sealing baffle 31 of this embodiment effectively prevents mosquitoes from entering the air outlet, fundamentally preventing the ejection of mosquito carcasses. This is of great significance for protecting precious paintings, calligraphy, and other cultural relics, preventing the reduction in their value and increased restoration costs caused by mosquito contamination.

[0052] See also Figure 5 In this embodiment, the exhaust hood 32 is a housing structure with a second central opening. Exhaust slots 321 are arranged around the perimeter of the hood, angled upward. The slots 321 are coated with a hydrophobic coating (Teflon). This coating reduces the surface tension of the outlet, making it difficult for condensed water to adhere to the surface. When condensed water contacts the hydrophobic-coated outlet surface, it forms droplets that quickly roll off under the influence of gravity, rather than forming a film or accumulating on ordinary surfaces.

[0053] In this embodiment, a water-blocking maze (not shown in the figure) is provided in the exhaust trough 321. In the traditional air outlet design, condensed water may drip directly onto the ground or onto cultural relics, causing damage to the exhibition hall environment and cultural relics. The water-blocking maze of this embodiment can cause condensed water to accumulate inside the maze, and drain the water through a reasonably designed drainage channel (such as in conjunction with the water collection tray 33), keeping the exhibition hall dry and tidy. The specific principle is: the water-blocking maze set in the exhaust trough 321 has a unique design. When the wind carrying water vapor enters the exhaust trough 321, it will collide and deflect with the water-blocking maze multiple times. This complex path design greatly increases the contact area and contact time between water vapor and the maze wall, so that water vapor can be fully intercepted and condensed into water droplets, effectively preventing water vapor from being discharged directly from the air outlet with the air flow, thereby preventing the sewage formed by water vapor condensation from spraying onto the calligraphy and painting cultural relics in the exhibition hall, providing reliable protection for the cultural relics.

[0054] In this embodiment, the water collection tray 33 comprises a base and a water guide. The water guide is a conical structure, with its upper end screwed to the underside of the second opening of the exhaust hood 32. The lower end of the water guide is connected to the base. The lower side of the second opening mates with the upper end of the water collection tray 33, while the upper side of the second opening communicates with the first opening. The inner diameter of the second opening is smaller than that of the first opening.

[0055] In combination with the above embodiments, the present invention further provides the operating principle of the above-mentioned insect-proof and drip-proof air outlet (the principle of insect-proof and drip-proof air outlet):

[0056] Air conditioning on stage:

[0057] Sealing baffle 31 opens: When the central air conditioner starts, motor 316 receives a start signal and begins operating. The shaft end of motor 316 drives swing arm 315 to rotate. This swing arm 315 is connected to linkage rod 314 via a pin. As swing arm 315 rotates, linkage rod 314 is pulled. Linkage rod 314 is connected to connecting pieces 313 on the multiple sealing louvers 312. Driven by linkage rod 314, connecting pieces 313 shift, causing each sealing louver 312 to rotate synchronously around its axis within the first opening of housing 311. The previously sealed sealing louvers 312 gradually open, unlocking air outlet duct 1 and allowing air to flow smoothly through.

[0058] Airflow generator 2 operates: It generates intermittent, high-intensity pulsed airflow. This pulsed airflow enters exhaust vent 3 from outlet duct 1, mixes with the normal airflow, and is discharged through the second opening of exhaust hood 32. This pulsed airflow effectively disrupts the flight paths of mosquitoes, preventing them from approaching the outlet, while also meeting the airflow control requirements of the complex exhibition hall environment.

[0059] Normal exhaust and initial condensation treatment: Normal airflow carrying water vapor enters the exhaust slots 321 of the exhaust hood 32. Because the exhaust slots 321 are inclined upward and their inner walls are coated with a hydrophobic Teflon coating, the water vapor in the airflow is less likely to adhere to the inner walls of the exhaust slots 321 due to the reduced surface tension of the coating. This prevents the water vapor from adhering to the inner walls and quickly condenses into small droplets. Under the influence of gravity, the small droplets roll down the inclined inner walls of the exhaust slots 321, initially preventing the water vapor from accumulating inside the slots 321 to form a film or significant water accumulation.

[0060] Condensate accumulation and discharge: During the operation of the air conditioner, some small water droplets that are not discharged in time and the condensed water that may be produced later will continue to flow along the exhaust groove 321. The water-blocking maze set in the exhaust groove 321 plays a role. When the air flow carrying water vapor or condensed water enters the exhaust groove 321, it will collide and turn with the water-blocking maze many times. This complex path design greatly increases the contact area and contact time between water vapor and the maze wall, so that water vapor can be fully intercepted and condensed into water droplets. Water droplets accumulate inside the maze, and as the amount of water increases, the water droplets will flow along the reasonably designed drainage channel. The drainage channel cooperates with the water collection tray 33 to guide the accumulated condensed water to the water collection tray 33. The water collection tray 33 consists of a chassis and a water guide tray. The water guide tray is a conical structure. The upper end is fixed to the lower side of the second opening of the exhaust hood 32 by screws, and the lower end is connected to the chassis. The condensed water flows into the water guide tray from the lower side of the second outlet and then gathers in the bottom tray, thus keeping the exhibition hall dry and tidy, and preventing the condensed water from dripping directly onto the ground or cultural relics and causing damage to the exhibition hall environment and cultural relics.

[0061] Air conditioning off stage:

[0062] The sealing baffle 31 is closed: when the central air conditioner is turned off, the motor 316 receives the shutdown signal and runs in the reverse direction. The shaft end of the motor 316 drives the rocker arm 315 to rotate in the reverse direction. The rocker arm 315 pulls the linkage rod 314 to move in the opposite direction. The linkage rod 314 drives the sealing louvers 312 to rotate in the reverse direction around the shaft rod through the connecting piece 313. The multiple sets of sealing louvers 312 are gradually closed, and finally the air outlet channel 1 is completely sealed, forming a tight physical barrier to prevent mosquitoes from the outside from entering the air outlet.

[0063] It is worth noting that the entire device is controlled by a general control system. Since the equipment matched with the control system is commonly used equipment and belongs to existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0064] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Any changes, modifications, replacements and variations of the above embodiments by ordinary technicians in this field within the scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. An insect-proof and drip-proof air outlet at the terminal of a central air conditioner in an exhibition hall, comprising an air outlet channel (1) connected to a flange of the terminal of the central air conditioner, an air flow generator (2) arranged in the air outlet channel (1), and an air outlet (3) arranged at the terminal of the air outlet channel (1), wherein the air outlet (3) comprises a sealing baffle (31), an air exhaust cover (32) and a water collection tray (33) arranged in sequence from top to bottom, and is characterized in that: The sealing baffle (31) is linked to the opening and closing action of the central air conditioner and seals or opens the air outlet channel (1). The sealing baffle (31) includes a housing (311), a sealing louver (312), a connecting piece (313), a linkage rod (314), a swing rod (315) and a motor (316); The exhaust hood (32) is a hood structure with a second opening in the middle, and exhaust slots (321) inclined upward are provided around the exhaust hood (32); The water collecting tray (33) comprises a bottom tray and a water guide tray. The water guide tray is a conical structure and its upper end is fixed to the lower side of the second opening of the exhaust cover (32) by screws. The lower end of the water guide tray is connected to the bottom tray.

2. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in the exhibition hall according to claim 1 is characterized by: The airflow generator (2) is a pulse-type airflow generating device.

3. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 1, characterized in that: The housing (311) is a rectangular frame with a first opening in the middle. Multiple groups of sealing louvers (312) are arranged in the first opening of the housing (311). Each sealing louver (312) is rotatably installed in the first opening via a shaft.

4. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 3, characterized in that: One side shaft end of the sealing louver (312) passes through the housing (311) and is connected to the connecting piece (313), and the linkage rod (314) is connected to the connecting pieces (313) on the plurality of sealing louvers (312) via a pin shaft.

5. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 1, characterized in that: The motor (316) is fixed on the outside of the housing (311). The shaft end of the motor (316) is connected to the swing rod (315). The end of the swing rod (315) is connected to the shaft end of the sealing baffle (31). The swing rod (315) rotates with the motor (316) and drives the sealing louver (312) to move through the linkage rod (314).

6. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 1, characterized in that: The exhaust slot (321) is coated with a hydrophobic coating.

7. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 1, characterized in that: A water-blocking labyrinth is provided in the exhaust slot (321).

8. The insect-proof and drip-proof air outlet at the terminal of the central air conditioner in an exhibition hall according to claim 1, characterized in that: The lower side of the second opening cooperates with the upper end of the water accumulation tray (33), the upper side of the second opening is connected to the first opening, and the inner diameter of the second opening is smaller than the inner diameter of the first opening.

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