Fabricated composite air duct for large halls

Abstract

The present application relates to the technical field of ventilation pipe, in particular to an assembled composite ventilation pipe for large factory building, which comprises a transverse ventilation pipe, an adapter pipe, a longitudinal ventilation pipe and a wall, a water collecting box is arranged at the bottom of the transverse ventilation pipe outside the wall, the water collecting box is used for collecting ice water from the inner wall of the longitudinal ventilation pipe to prevent the ice water from flowing back to the inside of the transverse ventilation pipe, a water guiding mechanism is movably arranged in the water collecting box, the water guiding mechanism supports the ice water during the water collecting stage and releases the ice water when the liquid level in the water collecting box reaches a preset weight. The melted ice water is collected by the water collecting box, which prevents the ice water from staying in the transverse ventilation pipe and affecting the exhaust. Moreover, the gravity of the collected ice water drives the water guiding plate and the adjusting plate to move downward synchronously, and the guide plate rotates outward to guide the hot air flow to blow against the inner wall of the longitudinal ventilation pipe, which improves the ice melting effect and increases the pressure in the transverse ventilation pipe to improve the discharge speed of the ice water on the water guiding plate.

Description

Technical Field

[0001] This invention relates to the field of ventilation duct technology, and more specifically, to a prefabricated composite ventilation duct for large factories. Background Technology

[0002] Ventilation ducts are hollow pipes used for ventilation, mostly round or square. Common types of ventilation ducts include: air supply and return ducts for purification systems, ventilation ducts for central air conditioning, ventilation ducts for industrial air supply and exhaust, ventilation ducts for environmental protection systems, gas extraction pipes for mines, and coated fabric ventilation ducts for mines; fire-fighting smoke ducts, etc.

[0003] Ventilation ducts are widely used in various fields, such as ventilation in processing workshops, exhaust of factory waste gas, and airflow exchange in various enclosed spaces.

[0004] Traditional ventilation ducts on the market have a simple structure and are usually connected to equipment for exhaust. When the ventilation duct is in a cold region, the factory stops exhausting, and the indoor hot air stops being discharged. The temperature of the outdoor ventilation duct gradually decreases. When the outside temperature drops sharply, there is still hot air flowing inside the ventilation duct. When the hot air comes into contact with the cold inner wall of the outer ventilation duct, ice will form on the inner wall. As a result, during the secondary ventilation process, the hot air causes the ice to melt, and the melted water droplets remain in the ventilation duct, causing the liquid level to gradually rise, thus affecting the ventilation effect. Secondly, the ventilation duct relies on the hot air inside to heat the condensed ice, but most of the hot air is discharged directly from the ventilation duct without contacting the ice surface, which reduces the melting effect of the ice surface. Summary of the Invention

[0005] This invention provides a prefabricated composite air duct for large factories. Melted ice water is collected in a water collection box to prevent it from stagnating in the horizontal air duct and affecting exhaust. Furthermore, the gravity of the collected ice water drives the water inlet plate and regulating plate to move downwards synchronously, while the guide plate rotates outwards to direct hot airflow towards the inner wall of the vertical air duct. This improves the ice melting effect while simultaneously increasing the pressure within the horizontal air duct, thus increasing the discharge rate of ice water from the water inlet plate. This solves the problems mentioned in the background art, namely:

[0006] To achieve the above objectives, the prefabricated composite air duct for large factories includes a horizontal air duct, a connecting air duct, a vertical air duct, and a wall. A water collection box is connected to the bottom of the horizontal air duct on the outside of the wall. The water collection box is used to collect ice water from the inner wall of the vertical air duct to prevent it from flowing back to the inside of the horizontal air duct. A water guiding mechanism is movably installed inside the water collection box. The water guiding mechanism supports the ice water during the water collection stage and releases the ice water when the liquid level in the water collection box reaches a preset weight.

[0007] The longitudinal duct is equipped with an air duct adjustment mechanism. The air duct adjustment mechanism is driven to move downward according to the weight of the ice water in the water collection box, so that the air duct adjustment mechanism can adjust the flow direction of the hot air in the longitudinal duct and make the hot air blow towards the inner wall of the longitudinal duct.

[0008] Secondly, the water-guiding mechanism includes a water-guiding plate movably disposed within the water collection box, and a water-guiding pipe fixedly disposed at the bottom of the water-guiding plate. The water-guiding plate is responsible for intercepting the collected ice water, so that the ice water is stored in the water collection box.

[0009] The water pipe is connected to a circular hole on the water inlet plate. The inner diameter of the water pipe is the same as the size of the circular hole. The water pipe is used to drain the ice water collected above the water inlet plate.

[0010] An L-shaped plate is fixedly installed on the water intake plate. A sliding rod is slidably connected to the other vertical end of the L-shaped plate. A water-blocking rod is fixedly connected to the bottom of the sliding rod, extending into a circular hole and inside the water intake pipe. Under normal conditions, the water-blocking rod blocks the ice water above the water intake plate. When the preset discharge volume is reached, the water-blocking rod is dislodged from the water intake pipe.

[0011] A memory spring is elastically fixed between the L-shaped plate and the water-blocking rod, and the memory spring is sleeved on the outside of the sliding rod.

[0012] The bottom of the water collection box has a convex plate that bends inward, and an exhaust port is formed between the two convex plates. An auxiliary ring is fixedly connected between the two convex plates. The auxiliary ring is sleeved on the water inlet pipe to stabilize the position of the water inlet pipe.

[0013] The air duct adjustment mechanism includes a guide plate that is symmetrically rotated and installed in the longitudinal air duct, and an adjustment plate located in the angle between the two guide plates. The two sides of the guide plate are in contact with the inner wall of the longitudinal air duct. The adjustment plate is used to control the size of the angle between the two guide plates, and the guide plate is used to guide the hot air to the outside.

[0014] An arc-shaped spring is elastically fixed between the two sides of the guide plate. The arc-shaped spring maintains the size of the angle between the guide plates, and a channel for the flow of heating air is formed between the guide plate and the inner wall of the longitudinal air duct.

[0015] A lever is fixedly installed at the bottom of the adjusting plate. The lever is located between the two guide plates. The bottom of the plate has a connecting air duct that passes through and is fixedly connected to a slip ring. The slip ring is sleeved on the water inlet pipe, and the top of the plate is attached to a baffle fixed on the water inlet pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Melted ice water is collected in a water collection box to prevent it from stagnating in the horizontal duct and affecting exhaust. Furthermore, the gravity of the collected ice water drives the water inlet plate and regulating plate to move downwards synchronously, while the guide plate rotates outwards to direct hot airflow towards the inner wall of the vertical duct. This improves the ice melting effect and simultaneously increases the pressure within the horizontal duct, accelerating the discharge rate of ice water from the water inlet plate.

[0018] 2. The rising water level is blocked by a water-blocking rod, and when the preset drainage volume is reached, the memory spring pulls out the water-blocking rod, and the ice water on the water inlet plate is discharged through the water inlet pipe, thereby realizing the automatic discharge of the collected ice water. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal airflow structure of the horizontal duct, the connecting duct, and the vertical duct of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection structure between the water pipe and the lever of the present invention;

[0022] Figure 4 This is a schematic diagram of the water collection principle inside the water collection box of the present invention;

[0023] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the diagram;

[0024] Figure 6 This is a schematic diagram of the hot airflow delivery structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the flat-lay structure of the guide plate of the present invention.

[0026] The meanings of the labels in the diagram are as follows:

[0027] 100. Horizontal duct; 101. Adapter duct; 102. Vertical duct; 103. Wall;

[0028] 110. Water collection box; 111. Convex plate; 112. Auxiliary ring;

[0029] 120. Water intake mechanism; 121. Water intake plate; 122. Water intake pipe; 123. Baffle; 124. Stop block;

[0030] 130. Air duct adjustment mechanism; 131. Guide vane; 132. Adjustment plate; 133. Arc spring; 134. Lever; 135. Slip ring; 136. Channel;

[0031] 140. L-shaped plate; 141. Sliding rod; 142. Water-blocking rod; 143. Memory spring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Traditional ventilation ducts on the market have a simple structure and are usually connected to equipment for exhaust. When the ventilation duct is in a cold region, the factory stops exhausting, and the indoor hot air stops being discharged. The temperature of the outdoor ventilation duct gradually decreases. When the outside temperature drops sharply, there is still hot air flowing inside the ventilation duct. When the hot air comes into contact with the cold inner wall of the outer ventilation duct, ice will form on the inner wall. As a result, during the secondary ventilation process, the hot air causes the ice to melt, and the melted water droplets remain in the ventilation duct, causing the liquid level to gradually rise, thus affecting the ventilation effect. Secondly, the ventilation duct relies on the hot air inside to heat the condensed ice, but most of the hot air is discharged directly from the ventilation duct without contacting the ice surface, which reduces the melting effect of the ice surface.

[0034] Therefore, in view of the above-mentioned problems, the present invention provides a prefabricated composite air duct for large factories, see [link to relevant documentation]. Figures 1-3 As shown, it includes a horizontal duct 100, a connecting duct 101, and a vertical duct 102. The horizontal duct 100, the connecting duct 101, and several vertical ducts 102 are spliced ​​together to form a ventilation duct. During installation, a through hole slightly larger than the size of the horizontal duct 100 is first drilled in the wall 103. Then, the horizontal duct 100 is inserted into the through hole. Sealing foam is filled in the gap between the through hole and the horizontal duct 100. Then, the connecting duct 101 and the vertical duct 102 are fixed in sequence.

[0035] When ice forms on the inner wall of the longitudinal duct 102, the hot air causes the ice to melt. At this time, a water collection box 110 is connected to the bottom of the transverse duct 100 outside the wall 103. The water collection box 110 is used to collect the ice water from the inner wall of the longitudinal duct 102 to prevent it from flowing back into the inner side of the transverse duct 100. A water guiding mechanism 120 is movably installed inside the water collection box 110. The water guiding mechanism 120 supports the ice water during the water collection stage and releases the ice water when the liquid level in the water collection box 110 reaches a preset weight. Therefore, the ice water is collected... At this time, the top of the water collection box 110 is open, and the bottom of the corresponding horizontal air duct 100 has the same through groove. The hot air flowing in the vertical air duct 102 flows through the ice block condensed on the inner wall, transferring heat to the ice block, causing the ice block to melt and fall off faster. Some of the melted ice water is carried away by the hot air flow, while most of the ice water slides down the inner wall of the vertical air duct 102 through the transfer air duct 101 into the water collection box 110 for collection. This prevents the ice water from staying in the horizontal air duct 100, which would cause the liquid level to rise and affect the exhaust.

[0036] When the ice water slides into the water collection box 110, the water guiding mechanism 120 includes a water guiding plate 121 movably disposed in the water collection box 110, and a water guiding pipe 122 fixedly disposed at the bottom of the water guiding plate 121. The water guiding plate 121 is responsible for intercepting the collected ice water, so that the ice water is stored in the water collection box 110. When discharging the ice water, the water guiding pipe 122 is connected to the round hole on the water guiding plate 121. The inner diameter of the water guiding pipe 122 is the same as the size of the round hole. The water guiding pipe 122 is used to guide the ice water collected above the water guiding plate 121. In this way, the ice water flows into the water guiding pipe 122 through the round hole and is finally discharged from the water guiding pipe 122.

[0037] To prevent the ice water that has just collected on the water inlet plate 121 from being discharged directly from the water inlet pipe 122, therefore, in combination with Figure 4 , Figure 5 As shown, an L-shaped plate 140 is fixedly installed on the water intake plate 121. A sliding rod 141 is slidably connected to the other vertical end of the L-shaped plate 140. A water-blocking rod 142 is fixedly connected to the bottom of the sliding rod 141, extending into the round hole and the water intake pipe 122. Under normal conditions, the water-blocking rod 142 blocks the ice water above the water intake plate 121. When the preset discharge volume is reached, the water-blocking rod 142 disengages from the water intake pipe 122. The specific working principle is as follows:

[0038] Under normal conditions, the state of the water inlet plate 121 is as follows: Figure 4As shown, the melted ice water collects on the water-guiding plate 121. At this time, the circular hole on the water-guiding plate 121 is closed. This is because a memory spring 143 is elastically fixed between the L-shaped plate 140 and the water-blocking rod 142. The memory spring 143 is sleeved on the outside of the sliding rod 141. The memory spring 143 exhibits a soft phase at high temperatures and a hard phase at low temperatures. Initially, the memory spring 143 is in the hot airflow flowing within the transverse duct 100. The temperature of the hot airflow keeps the memory spring 143 in the soft phase. During the rising phase of the liquid level on the water inlet plate 121, the ice water inside the water inlet plate 121 will gradually submerge the memory spring 143. The memory spring 143 will gradually change from a soft phase to a hard phase. The water-blocking rod 142 located in the water inlet pipe 122 will be gradually pulled out. When the liquid level completely submerges the memory spring 143, the memory spring 143 will come out from the round hole and move away from the water inlet plate 121 in the horizontal direction. At this time, the round hole and the water inlet pipe 122 will be connected, and the stored ice water will be discharged from the water inlet pipe 122, thereby achieving the purpose of automatic drainage.

[0039] That is, the water-blocking rod 142 is used to block the rising water level, and when the preset drainage volume is reached, the memory spring 143 pulls out the water-blocking rod 142, and the ice water on the water-guiding plate 121 is discharged through the water-guiding pipe 122, thereby realizing the automatic discharge of the collected ice water.

[0040] It should be noted that the low temperature and high temperature mentioned above are relative states. That is, when no ice water flows into the water inlet plate 121, the water collection box 110 is connected to the horizontal air duct 100, and the memory spring 143 is in a high temperature state. Conversely, when ice water flows into the water inlet plate 121, the ice water comes into contact with the memory spring 143, and the memory spring 143 is in a low temperature state.

[0041] Furthermore, returning to Figure 2 , Figure 3 As shown, a duct adjustment mechanism 130 is provided inside the longitudinal duct 102. The duct adjustment mechanism 130 is driven to move downward according to the weight of the ice water in the water collection box 110, so that the duct adjustment mechanism 130 adjusts the flow direction of the hot air in the longitudinal duct 102, so that the hot air blows towards the inner wall of the longitudinal duct 102, thereby increasing the melting speed of the ice on the inner wall of the longitudinal duct 102. That is to say, during the water collection stage, as the water level on the water guide plate 121 rises and the weight increases, the water guide plate 121 and the water guide pipe 122 move downward as a whole. During this process, the bottom of the water collection box 110 is bent inward with a convex plate 111, and an exhaust port is formed between the two convex plates 111. An auxiliary ring 112 is fixedly connected between the two convex plates 111. When the water guide pipe 122 descends, the auxiliary ring 112 is sleeved on the water guide pipe 122 to stabilize the position of the water guide pipe 122.

[0042] When adjusting the hot airflow inside the longitudinal duct 102, the structure of the duct adjustment mechanism 130 is first disclosed. The duct adjustment mechanism 130 includes a guide plate 131 that is symmetrically rotated inside the longitudinal duct 102, and an adjustment plate 132 located within the angle between the two guide plates 131. The two sides of the guide plate 131 are in contact with the inner wall of the longitudinal duct 102. When the adjustment plate 132 moves down, the adjustment plate 132 is used to control the size of the angle between the two guide plates 131. As the position of the adjustment plate 132 increases, the angle between the two guide plates 131 increases, and the guide plate 131 is used to guide the hot air to the outside, so that more hot airflow comes into contact with the ice on the inner wall of the longitudinal duct 102, increasing the heat conduction between the hot airflow and the ice, thereby further accelerating the melting speed of the ice.

[0043] Without adjusting the angle between the two guide vanes 131, based on Figure 4 Based on and combined Figure 6 As shown, an arc-shaped spring 133 is elastically fixed between the two guide plates 131 at an angle. The arc-shaped spring 133 maintains the angle between the guide plates 131, forming a channel 136 for the flow of heated air between the guide plates 131 and the inner wall of the longitudinal air duct 102. On the other hand, a lever 134 is fixedly installed at the bottom of the adjusting plate 132. The lever 134 is located between the two guide plates 131, and a slip ring 135 is fixedly connected to the bottom of the connecting air duct 101. The slip ring 135 is sleeved on the water inlet pipe 122, and its top is in contact with the baffle 123 fixed on the water inlet pipe 122. Specifically, during operation:

[0044] Under normal conditions, the elastic potential energy of the arc spring 133 tightens the guide plates 131 on both sides, preventing the adjusting plate 132 from moving downwards. At the same time, the slip ring 135 holds the baffle 123 in place, maintaining the water guide plate 121 at its position. Figure 4 As the liquid level on the water inlet plate 121 increases, the weight increases, and the pressure exerted by the baffle 123 on the slip ring 135 overcomes the elastic potential energy of the arc spring 133, driving the adjusting plate 132 to move downward. The adjusting plate 132 pushes the guide plate 131 outward on both sides, and the guide plate 131 guides the hot airflow in the middle of the longitudinal duct 102 to the side wall of the longitudinal duct 102, allowing more hot airflow to flow through the side wall of the longitudinal duct 102, thus improving the melting effect of the ice. Moreover, the cross-sectional area of ​​the hot airflow flowing in the channel 136 gradually decreases, which increases the flow velocity of the hot airflow in the channel 136. When the flow velocity of the hot airflow increases, more heat is transferred to the ice per unit time, thus increasing the melting speed of the ice.

[0045] Furthermore, when the liquid level on the water inlet plate 121 reaches the preset drainage volume, the ice water on the water inlet plate 121 is discharged from the water inlet pipe 122. During this process, due to the reduction in the cross-sectional area of ​​the hot airflow at the channel 136, the pressure in the longitudinal air duct 102, the connecting air duct 101, and the transverse air duct 100 increases. The transverse air duct 100 is connected to the water collection box 110. That is, the hot airflow with increased pressure will also pressurize the liquid level on the water inlet plate 121, thereby increasing the discharge speed of the liquid in the water inlet plate 121.

[0046] In other words, the melted ice water is collected by the water collection box 110 to prevent it from stagnating in the horizontal duct 100 and affecting exhaust. Furthermore, the gravity of the collected ice water drives the water guide plate 121 and the regulating plate 132 to move downwards simultaneously, and the guide plate 131 rotates outwards to guide the hot airflow to blow towards the inner wall of the vertical duct 102. This improves the melting effect of the ice while also forcing an increase in pressure inside the horizontal duct 100, thereby increasing the discharge speed of the ice water on the water guide plate 121.

[0047] As the liquid level on the water inlet plate 121 decreases, the arc spring 133 gradually overcomes gravity and drives the guide plates 131 on both sides to retract and reset. At the same time, the slip ring 135 moves upward to apply reverse pressure to the baffle 123, causing the water inlet plate 121 to move upward and reset. When the liquid level in the water inlet plate 121 is completely discharged, the memory spring 143 changes from a hard phase to a soft phase, pushing the water blocking rod 142 into the water inlet pipe 122 to seal the round hole and the water inlet pipe 122 again. The sliding rod 141 is designed to ensure that the water blocking rod 142 accurately extends into the round hole and prevents it from deviating.

[0048] Finally, when the venting stops, stop blocks 124 are symmetrically fixed on the inner wall of the water collection box 110. By moving the water inlet pipe 122 upward, the stop blocks 124 block the water inlet plate 121. Then, the lever 134 is pulled downward, forcing the guide plates 131 on both sides to remain horizontal (see reference). Figure 7 (As shown in the dashed line section), at this time, the guide plates 131 on both sides separate the upper and lower parts of the longitudinal air duct 102. Use a wrench to tighten the bolts on the slip ring 135 so that the slip ring 135 is connected and fixed to the water inlet pipe 122. In this way, the guide plates 131 on both sides can also intercept impurities and prevent impurities at the top from falling into the pipe and affecting the exhaust.

[0049] If impurities fall onto the guide plate 131, the longitudinal air duct 102 is disassembled manually to clean the impurities before being reinstalled and used.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated composite air duct for large factory buildings, comprising a horizontal air duct (100), a connecting air duct (101), and a vertical air duct (102), characterized in that: A water collection box (110) is connected to the bottom of the horizontal air duct (100) on the outside of the wall (103). The water collection box (110) is used to collect ice water from the inner wall of the vertical air duct (102) to prevent it from flowing back to the inside of the horizontal air duct (100). A water guiding mechanism (120) is movably installed inside the water collection box (110). The water guiding mechanism (120) supports the ice water during the water collection stage and releases the ice water when the liquid level in the water collection box (110) reaches a preset weight. The longitudinal duct (102) is provided with a duct adjustment mechanism (130). The duct adjustment mechanism (130) is driven to move downward according to the weight of the ice water in the water collection box (110), so that the duct adjustment mechanism (130) adjusts the flow direction of the hot air in the longitudinal duct (102) and realizes that the hot air blows towards the inner wall of the longitudinal duct (102).

2. The prefabricated composite air duct for large factory buildings according to claim 1, characterized in that: The top of the water collection box (110) is open, and the bottom of the corresponding horizontal air duct (100) has the same through groove.

3. The prefabricated composite air duct for large factory buildings according to claim 1, characterized in that: The water intake mechanism (120) includes a water intake plate (121) movably disposed in the water collection box (110) and a water intake pipe (122) fixedly disposed at the bottom of the water intake plate (121). The water intake plate (121) is responsible for intercepting the collected ice water so that the ice water is stored in the water collection box (110).

4. The prefabricated composite air duct for large factory buildings according to claim 3, characterized in that: The water pipe (122) is connected to the round hole on the water plate (121). The inner diameter of the water pipe (122) is the same as the size of the round hole. The water pipe (122) is used to draw out the ice water collected above the water plate (121).

5. The prefabricated composite air duct for large factory buildings according to claim 4, characterized in that: An L-shaped plate (140) is fixedly installed on the water intake plate (121). A sliding rod (141) is slidably connected to the other vertical end of the L-shaped plate (140). A water-blocking rod (142) is fixedly connected to the bottom of the sliding rod (141) and extends into the round hole and the water intake pipe (122). The water-blocking rod (142) blocks the ice water above the water intake plate (121) under normal conditions. When the preset discharge volume is reached, the water-blocking rod (142) is dislodged from the water intake pipe (122).

6. The prefabricated composite air duct for large factory buildings according to claim 5, characterized in that: A memory spring (143) is elastically fixed between the L-shaped plate (140) and the water-blocking rod (142), and the memory spring (143) is sleeved on the outside of the slide rod (141).

7. The prefabricated composite air duct for large factory buildings according to claim 3, characterized in that: The bottom of the water collection box (110) is bent inward with a convex plate (111), and an exhaust port is formed between the two convex plates (111). An auxiliary ring (112) is fixedly connected between the two convex plates (111). The auxiliary ring (112) is sleeved on the water inlet pipe (122) for stabilizing the position of the water inlet pipe (122).

8. The prefabricated composite air duct for large factory buildings according to claim 3, characterized in that: The air duct adjustment mechanism (130) includes a guide plate (131) symmetrically rotated in the longitudinal air duct (102) and an adjustment plate (132) located in the angle between the two guide plates (131). The two sides of the guide plate (131) are in contact with the inner wall of the longitudinal air duct (102). The adjustment plate (132) is used to control the size of the angle between the two guide plates (131). The guide plate (131) is used to guide the hot air to the outside.

9. The prefabricated composite air duct for large factory buildings according to claim 8, characterized in that: An arc spring (133) is elastically fixed between the two sides of the guide plate (131). The arc spring (133) maintains the angle between the guide plates (131). A channel (136) for the flow of heating air is formed between the guide plate (131) and the inner wall of the longitudinal air duct (102). The bottom of the adjusting plate (132) is fixedly provided with a lever (134), which is located between the two guide plates (131). The bottom of the lever (134) is connected to the connecting air pipe (101) and a slip ring (135) is fixedly connected. The slip ring (135) is sleeved on the water pipe (122), and the top is in contact with the baffle (123) fixed on the water pipe (122).

10. The prefabricated composite air duct for large factory buildings according to claim 3, characterized in that: A stop block (124) is symmetrically fixed on the inner wall of the water collection box (110), and the stop block (124) blocks the water inlet plate (121).

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