Ventilation pipeline of central air conditioner

By designing central air-conditioning ventilation ducts that are easy to install and disassemble, and combining with automatic cleaning systems, the problems of inconvenient installation and difficulty in internal cleaning in the prior art are solved, and air quality and maintenance convenience are improved.

CN222993137UActive Publication Date: 2025-06-17COSCO SHIPYARD ENG SERVICE (DALIAN) CO LTD
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Patent Information

Application Number
CN202422029872.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-21
Publication Date
2025-06-17
Estimated Expiration
2034-08-21

AI Technical Summary

Technical Problem

The existing central air-conditioning ventilation ducts are not convenient for installation and disassembly, and the interior of the ducts is difficult to clean, causing dust to flow with the air and reduce air quality.

Method used

A central air-conditioning ventilation duct including mounting frame, clamping plate, clamping shaft, spring and snapping assembly is designed. Through sliding of clamping plate and clamping shaft and fixing of clamping plates, the pipe is easily installed and disassembled; at the same time, the belt and roller brush system driven by the motor are automatically cleaned, and the dust removal pump and dust exhaust pipe are used for effective dust discharge.

Benefits of technology

It realizes convenient installation and disassembly of pipelines, ensuring the convenience of post-maintenance, and at the same time, through the automatic cleaning system, dust from the inner walls of the pipelines is effectively removed and air quality is improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of ventilating ducts, and discloses a central air conditioner ventilating duct which comprises a mounting frame, a first clamping plate is slidably connected in the mounting frame, a first clamping shaft is fixedly connected to the outer wall of the first clamping plate, a second clamping plate is slidably connected in the mounting frame, a first spring is sleeved on the outer wall of the first clamping shaft, and a second spring is sleeved on the outer wall of the second clamping shaft. One end of the first spring is fixedly connected to the outer wall of the first clamping plate, the other end of the first spring is fixedly connected to the outer wall of the second clamping plate, and a first clamping pin is slidably connected into the second clamping plate. According to the pipeline fixing device, the first clamping plate and the second clamping plate are pulled, a pipeline body is placed between the first clamping plate and the second clamping plate, the first spring and the third spring enable the clamping plates to reset automatically, the first clamping shaft and the second clamping shaft are clamped into the second clamping plate and the first clamping plate respectively, and the first clamping plate drives the second clamping pin to be clamped into the second clamping shaft to achieve buckle fixing; and the second clamping plate drives the first clamping pin to be clamped into the first clamping shaft to achieve buckle fixing, so that the pipeline body is fixed between the clamping plates, and installation is convenient.
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Description

Technical Field

[0001] The utility model relates to the technical field of ventilation ducts, in particular to a central air-conditioning ventilation duct. Background Art

[0002] Central air-conditioning ventilation ducts are used to distribute and regulate air in buildings, connecting central air-conditioning units to each room to ensure temperature balance and air circulation. They are responsible for distributing the treated cold or hot air to different areas to achieve temperature regulation and improve comfort. The duct design optimizes air flow, improves indoor air quality, and enhances the energy efficiency of the air-conditioning system. It includes components such as main ducts, branch ducts, return ducts, and air vents, which work together to ensure efficient and quiet operation.

[0003] In the prior art, conventional central air-conditioning ventilation ducts are usually directly fixed to the wall or inside the wall, which is not convenient for the installation and disassembly of the ducts, resulting in very inconvenient later maintenance. And there will be a large amount of dust inside the ducts after long-term use, so that when the central air-conditioning is turned on, the dust inside the ventilation ducts will also be blown up and flow with the air, thus resulting in poor air quality.

[0004] Regarding the structure of the prior art, the central air-conditioning ventilation duct is directly fixedly installed on the wall or inside the wall, which is not convenient for installation and disassembly. During long-term use, it needs to be maintained, resulting in inconvenient operation during the maintenance process, and the inside of the duct cannot be cleaned, resulting in a large amount of dust remaining inside the duct, prompting the dust to flow with the air and resulting in poor air quality. Summary of the Utility Model

[0005] In order to make up for the above deficiencies, the utility model provides a central air-conditioning ventilation duct, aiming to improve the problems of inconvenient installation and disassembly of the central air-conditioning ventilation duct and the cleaning problem inside the ventilation duct in the prior art.

[0006] To achieve the above object, the present utility model provides the following technical solution: A central air-conditioning ventilation duct, including a mounting rack, inside which a first clamping plate is slidably connected. A first clamping shaft is fixedly connected to the outer wall of the first clamping plate. A second clamping plate is slidably connected inside the mounting rack. A first spring is sleeved on the outer wall of the first clamping shaft. One end of the first spring is fixedly connected to the outer wall of the first clamping plate, and the other end of the first spring is fixedly connected to the outer wall of the second clamping plate. A first locking pin is slidably connected inside the second clamping plate, and the first locking pin is slidably connected inside the first clamping shaft. A second spring is arranged inside the second clamping plate. One end of the second spring is fixedly connected to the inside of the second clamping plate, and the other end of the second spring is fixedly connected to the upper surface of the first locking pin. A second clamping shaft is fixedly connected to the outer wall of the second clamping plate. A third spring is sleeved on the outer wall of the second clamping shaft. One end of the third spring is fixedly connected to the outer wall of the second clamping plate, and the other end of the third spring is fixedly connected to the outer wall of the first clamping plate. A fixing rod is fixedly connected to the upper surface of the mounting rack. A duct body is slidably connected to the outer wall of the first clamping plate, and the duct body is slidably connected to the outer wall of the second clamping plate. A buckle assembly is arranged inside the first clamping plate, and the buckle assembly is used for quickly installing the duct body.

[0007] Further, the buckle assembly includes a second locking pin, which is slidably connected inside the first clamping plate and also slidably connected inside the second clamping shaft. A fourth spring is arranged inside the first clamping plate. One end of the fourth spring is fixedly connected to the upper surface of the second locking pin, and the other end of the fourth spring is fixedly connected to the inside of the first clamping plate.

[0008] Further, a motor is fixedly connected to the outer wall of the duct body, and the output end of the motor is fixedly connected to a first hub shaft. A second hub shaft is rotatably connected inside the duct body.

[0009] Further, a first belt is rotatably connected to the outer wall of the first hub shaft, and a second belt is rotatably connected to the outer wall of the first hub shaft. The first belt is rotatably connected to the outer wall of the second hub shaft, and the second belt is rotatably connected to the outer wall of the second hub shaft.

[0010] Further, a first brush roller is slidably connected to the outer wall of the first belt and also slidably connected to the outer wall of the second belt. A second brush roller is slidably connected to the outer wall of the first belt, and a third brush roller is slidably connected to the outer wall of the second belt.

[0011] Further, the second brush roller is slidably connected inside the duct body, and the third brush roller is slidably connected inside the duct body. A dust removal pump is fixedly connected to the upper surface of the duct body. The output end of the dust removal pump is fixedly connected to a dust discharge pipe, and the input end of the dust removal pump is fixedly connected to the inside of the duct body.

[0012] Further, a first filter plate is fixedly connected inside the pipe body. The first filter plate is arranged at both ends inside the pipe body. An air supply pipe is fixedly connected to the outer wall of the pipe body, and a splicing plate is fixedly connected to the outer wall of the air supply pipe.

[0013] Further, a dust-proof plate is fixedly connected inside the splicing plate. An air outlet pipe is fixedly connected to the lower surface of the air supply pipe, and a second filter plate is fixedly connected inside the air outlet pipe.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, by pulling the first clamping plate and the second clamping plate, the pipe body is placed between the two. The first spring and the third spring cause the clamping plates to automatically reset. The first clamping shaft and the second clamping shaft are respectively inserted into the inside of the second clamping plate and the first clamping plate. The first clamping plate drives the second latch to be inserted into the inside of the second clamping shaft to achieve snap fixation, and the second clamping plate drives the first latch to be inserted into the inside of the first clamping shaft to achieve snap fixation, thereby fixing the pipe body between the clamping plates and facilitating installation.

[0016] 2. In the utility model, when the motor is started to drive the first hub shaft to rotate, the first hub shaft drives the first belt and the second belt to rotate, thereby driving the second hub shaft to rotate. Through the rotation of the first belt and the second belt, the first brush roller slides back and forth, and the first brush roller rolls on the inner wall of the pipe body to clean the upper side of the inner wall of the pipe body. At the same time when the first belt and the second belt rotate, they also drive the second brush roller and the third brush roller to slide back and forth to clean both sides of the inner wall of the pipe body. By starting two dust removal pumps, the cleaned dust is pumped out and discharged through the dust discharge pipe, thereby achieving the effect of automatic cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of a central air-conditioning ventilation pipe proposed by the utility model;

[0018] Figure 2 is a structural schematic diagram of the second clamping plate of a central air-conditioning ventilation pipe proposed by the utility model;

[0019] Figure 3 is Figure 2 an enlarged schematic diagram at A in

[0020] Figure 4 is a structural schematic diagram of the first clamping plate of a central air-conditioning ventilation pipe proposed by the utility model;

[0021] Figure 5 is Figure 4 an enlarged schematic diagram at B in

[0022] Figure 6 is a structural schematic diagram of the first brush roller of a central air-conditioning ventilation pipe proposed by the utility model;

[0023] Figure 7 Schematic diagram of the air outlet pipe structure of a central air-conditioning ventilation pipe proposed by the present utility model.

[0024] Legend:

[0025] 1. Mounting frame; 2. First clamping plate; 3. First clamping shaft; 4. First spring; 5. Second clamping plate; 6. First locking pin; 7. Second spring; 8. Second clamping shaft; 9. Third spring; 10. Second locking pin; 11. Fourth spring; 12. Fixed rod; 13. Pipe body; 14. Motor; 15. First hub shaft; 16. Second hub shaft; 17. First belt; 18. Second belt; 19. First brush roller; 20. Second brush roller; 21. Third brush roller; 22. Dust removal pump; 23. Dust discharge pipe; 24. First filter plate; 25. Air supply pipe; 26. Splicing plate; 27. Dust-proof plate; 28. Air outlet pipe; 29. Second filter plate. Specific implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Refer to Figure 1 - Figure 5, an embodiment provided by the present utility model: a central air-conditioning ventilation duct, including a mounting frame 1, a first clamping plate 2 is slidably connected inside the mounting frame 1, a first clamping shaft 3 is fixedly connected to the outer wall of the first clamping plate 2, a second clamping plate 5 is slidably connected inside the mounting frame 1, a first spring 4 is sleeved on the outer wall of the first clamping shaft 3, one end of the first spring 4 is fixedly connected to the outer wall of the first clamping plate 2, the other end of the first spring 4 is fixedly connected to the outer wall of the second clamping plate 5, a first pin 6 is slidably connected inside the second clamping plate 5, the first pin 6 is slidably connected inside the first clamping shaft 3, a second spring 7 is arranged inside the second clamping plate 5, one end of the second spring 7 is fixedly connected to the inside of the second clamping plate 5, the other end of the second spring 7 is fixedly connected to the upper surface of the first pin 6, a second clamping shaft 8 is fixedly connected to the outer wall of the second clamping plate 5, a third spring 9 is sleeved on the outer wall of the second clamping shaft 8, one end of the third spring 9 is fixedly connected to the outer wall of the second clamping plate 5, the other end of the third spring 9 is fixedly connected to the outer wall of the first clamping plate 2, a fixing rod 12 is fixedly connected to the upper surface of the mounting frame 1, a duct body 13 is slidably connected to the outer wall of the first clamping plate 2, the duct body 13 is slidably connected to the outer wall of the second clamping plate 5, a buckle assembly is arranged inside the first clamping plate 2, the buckle assembly is used for quickly installing the duct body 13, the buckle assembly includes a second pin 10, the second pin 10 is slidably connected inside the first clamping plate 2, the second pin 10 is slidably connected inside the second clamping shaft 8, a fourth spring 11 is arranged inside the first clamping plate 2, one end of the fourth spring 11 is fixedly connected to the upper surface of the second pin 10, the other end of the fourth spring 11 is fixedly connected to the inside of the first clamping plate 2;

[0028] Specifically, first fix the four fixing rods 12 to the mounting frame 1 and fix the upper ends of the fixing rods 12 to the ceiling, then pull the first clamping plate 2 and the second clamping plate 5 apart, place the duct body 13 between the first clamping plate 2 and the second clamping plate 5, after releasing the first clamping plate 2 and the second clamping plate 5, the first clamping plate 2 and the second clamping plate 5 slide closer to each other due to the reset effect of the first spring 4 and the third spring 9. The sliding of the first clamping plate 2 drives the first clamping shaft 3 to slide into the inside of the second clamping plate 5, and the sliding of the second clamping plate 5 drives the second clamping shaft 8 to slide into the inside of the first clamping plate 2. After the first clamping shaft 3 slides into the inside of the second clamping plate 5, the first pin 6 is squeezed and compresses the second spring 7. When the first clamping shaft 3 slides to make the first pin 6 snap into the inside of the first clamping shaft 3, the second spring 7 resets. When the second clamping shaft 8 slides into the inside of the first clamping plate 2, the second pin 10 is squeezed to compress the fourth spring 11. When the second clamping shaft 8 slides to make the second pin 10 snap into the inside of the second clamping shaft 8, the fourth spring 11 automatically resets. Thus, by this method, the first clamping plate 2 and the second clamping plate 5 are close to each other and clamp and fix the duct body 13, so as to achieve the effect of facilitating installation. When disassembly is required, pull the first clamping plate 2 and the second clamping plate 5 at both ends to pull the second clamping shaft 8 and the first clamping shaft 3 out of the inside of the first clamping plate 2 and the second clamping plate 5 respectively, and the duct body 13 can be taken out and disassembled.

[0029] Refer to Figure 1 and Figure 6 , an outer wall of the pipe body 13 is fixedly connected with a motor 14, an output end of the motor 14 is fixedly connected with a hub shaft one 15, a hub shaft two 16 is rotatably connected inside the pipe body 13, an outer wall of the hub shaft one 15 is rotatably connected with a belt one 17, an outer wall of the hub shaft one 15 is rotatably connected with a belt two 18, the belt one 17 is rotatably connected to an outer wall of the hub shaft two 16, the belt two 18 is rotatably connected to an outer wall of the hub shaft two 16, a brush roller one 19 is slidably connected to an outer wall of the belt one 17, the brush roller one 19 is slidably connected to an outer wall of the belt two 18, a brush roller two 20 is slidably connected to an outer wall of the belt one 17, and a brush roller three 21 is slidably connected to an outer wall of the belt two 18;

[0030] Specifically, start the motor 14 to drive the hub shaft one 15 to rotate. While the hub shaft one 15 rotates, it drives the belt one 17 and the belt two 18 to rotate. By the rotation of the belt one 17 and the belt two 18, the hub shaft two 16 is driven to rotate. While the belt one 17 and the belt two 18 rotate, they also drive the brush roller one 19 to slide back and forth, so that the brush roller one 19 cleans the dust at the top position of the inner wall of the pipe body 13. The rotation of the belt one 17 also drives the brush roller two 20 to slide, and the rotation of the belt two 18 drives the brush roller three 21 to slide. By the sliding of the brush roller two 20 and the brush roller three 21, the dust on both sides of the inner wall of the pipe body 13 is cleaned, achieving the effect of automatic cleaning.

[0031] Refer to Figure 1 , Figure 6 and Figure 7 , the brush roller two 20 is slidably connected inside the pipe body 13, the brush roller three 21 is slidably connected inside the pipe body 13, an upper surface of the pipe body 13 is fixedly connected with a dust removal pump 22, an output end of the dust removal pump 22 is fixedly connected with a dust discharge pipe 23, an input end of the dust removal pump 22 is fixedly connected inside the pipe body 13, a filter plate one 24 is fixedly connected inside the pipe body 13, the filter plate one 24 is arranged at both ends inside the pipe body 13, an outer wall of the pipe body 13 is fixedly connected with an air supply pipe 25, an outer wall of the air supply pipe 25 is fixedly connected with a splicing plate 26, a dust-proof plate 27 is fixedly connected inside the splicing plate 26, a lower surface of the air supply pipe 25 is fixedly connected with an air outlet pipe 28, and a filter plate two 29 is fixedly connected inside the air outlet pipe 28;

[0032] Specifically, start two dust removal pumps 22, extract the clean dust inside the pipe body 13 through the two dust removal pumps 22 and discharge it through the dust discharge pipe 23 to assist in achieving the cleaning effect. The filter plates 24 on both sides inside the pipe body 13 can filter dust during air flow. The air supply pipes 25 fixed on the outer walls on both sides of the pipe body 13 achieve the effect of air supply and convey the air out. Multiple pipe bodies 13 can be spliced through the splicing plates 26. At the same time, the dust-proof plate 27 can effectively prevent dust from entering the inside of the pipe body 13. The air supply pipes 25 supply air and convey the air out through the air outlet pipe 28. The filter plate 29 filters the dust in the air to prevent the air quality from decreasing.

[0033] Working principle: When the central air-conditioning ventilation pipe needs to be used, first fix the installation frame 1 on the ceiling through four fixing rods 12. Pull the clamping plate 1 2 and the clamping plate 2 5 to the two sides to separate the clamping plate 1 2 and the clamping plate 2 5. Then place the pipe body 13 between the clamping plate 1 2 and the clamping plate 2 5. After releasing the clamping plate 1 2 and the clamping plate 2 5, the first spring 4 and the third spring 9 automatically reset and drive the clamping plate 1 2 and the clamping plate 2 5 to slide and approach each other. The clamping plate 1 2 drives the first clamping shaft 3 to be inserted into the inside of the clamping plate 2 5, so that the first clamping pin 6 is inserted into the inside of the first clamping shaft 3 for fixation. The clamping plate 2 5 slides and drives the second clamping shaft 8 to be inserted into the inside of the clamping plate 1 2, and the second clamping pin 10 is inserted into the inside of the second clamping shaft 8 for fixation, thereby clamping the pipe body 13 to achieve the effect of convenient installation. When disassembly is required, pull the clamping plate 1 2 and the clamping plate 2 5 to the two sides to make the first clamping shaft 3 and the second clamping shaft 8 slide out of the inside of the clamping plate 1 2 and the clamping plate 2 5 respectively, which is convenient for later maintenance. After the pipe body 13 is used, dust is likely to be generated inside. Start the motor 14 to drive the first hub shaft 15 to rotate. The rotation of the first hub shaft 15 drives the first belt 17 and the second belt 18 to rotate simultaneously. During the rotation of the first belt 17 and the second belt 18, the second hub shaft 16 is driven to rotate. The rotation of the first belt 17 drives the first brush roller 19 to slide, and the rotation of the second belt 18 also drives the first brush roller 19 to slide, so that the first brush roller 19 slides back and forth on the outer walls of the first belt 17 and the second belt 18, thereby cleaning the dust on the top end of the inner wall of the pipe body 13 by the first brush roller 19. When the first belt 17 rotates, it drives the second brush roller 20 to slide, and the rotation of the second belt 18 drives the third brush roller 21 to slide. The inner walls on both sides of the pipe body 13 are cleaned by the second brush roller 20 and the third brush roller 21. Then start two dust removal pumps 22 to extract the dust generated by cleaning and discharge it through the dust discharge pipe 23. The filter plates 24 on both sides inside the pipe body 13 can filter the air dust and reduce the dust entering the inside of the pipe body 13. The air inside the pipe body 13 is supplied through the air supply pipes 25 and then discharged through the air outlet pipe 28. Through the splicing plates 26, it is convenient to splice and combine multiple pipe bodies 13 for use. The dust is filtered by the dust-proof plate 27 and the filter plate 29 to prevent dust from entering the inside of the pipe body 13, thereby achieving the cleaning effect.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A central air conditioning ventilation duct, comprising a mounting frame (1), characterized in that: The interior of the mounting frame (1) is slidably connected with a clamping plate (2), the outer wall of the clamping plate (2) is fixedly connected with a clamping shaft (3), the interior of the mounting frame (1) is slidably connected with a clamping plate (5), the outer wall of the clamping shaft (3) is sleeved with a spring (4), one end of the spring (4) is fixedly connected to the outer wall of the clamping plate (2), the other end of the spring (4) is fixedly connected to the outer wall of the clamping plate (5), the interior of the clamping plate (5) is slidably connected with a bayonet (6), the bayonet (6) is slidably connected to the interior of the clamping shaft (3), the interior of the clamping plate (5) is provided with a spring (7), one end of the spring (7) is fixedly connected to the interior of the clamping plate (5), the The other end of spring 2 (7) is fixedly connected to the upper surface of latch pin 1 (6); the outer wall of clamp plate 2 (5) is fixedly connected to clamp shaft 2 (8); the outer wall of clamp shaft 2 (8) is sleeved with spring 3 (9); one end of spring 3 (9) is fixedly connected to the outer wall of clamp plate 2 (5); the other end of spring 3 (9) is fixedly connected to the outer wall of clamp plate 1 (2); the upper surface of the mounting frame (1) is fixedly connected to a fixing rod (12); the outer wall of clamp plate 1 (2) is slidably connected to a pipe body (13); the pipe body (13) is slidably connected to the outer wall of clamp plate 2 (5); a buckle assembly is arranged inside clamp plate 1 (2); the buckle assembly is used for quickly installing the pipe body (13).

2. A central air conditioning ventilation duct according to claim 1, characterized in that: The buckle assembly includes a second bayonet pin (10), which is slidably connected to the inside of a first clamp (2), and the second bayonet pin (10) is slidably connected to the inside of a second clamp shaft (8). A fourth spring (11) is provided inside the first clamp (2), and one end of the fourth spring (11) is fixedly connected to the upper surface of the second bayonet pin (10), and the other end of the fourth spring (11) is fixedly connected to the inside of the first clamp (2).

3. A central air conditioning ventilation duct according to claim 1, characterized in that: The outer wall of the pipe body (13) is fixedly connected to a motor (14), the output end of the motor (14) is fixedly connected to a hub shaft 1 (15), and the interior of the pipe body (13) is rotatably connected to a hub shaft 2 (16).

4. A central air conditioning ventilation duct according to claim 3, characterized in that: The outer wall of the hub shaft one (15) is rotatably connected to a belt one (17), the outer wall of the hub shaft one (15) is rotatably connected to a belt two (18), the belt one (17) is rotatably connected to the outer wall of the hub shaft two (16), and the belt two (18) is rotatably connected to the outer wall of the hub shaft two (16).

5. A central air conditioning ventilation duct according to claim 4, characterized in that: The outer wall of the belt one (17) is slidably connected to a roller brush one (19), the roller brush one (19) is slidably connected to the outer wall of the belt two (18), the outer wall of the belt one (17) is slidably connected to a roller brush two (20), and the outer wall of the belt two (18) is slidably connected to a roller brush three (21).

6. A central air conditioning ventilation duct according to claim 5, characterized in that: The second roller brush (20) is slidably connected to the inside of the pipeline body (13), the third roller brush (21) is slidably connected to the inside of the pipeline body (13), the upper surface of the pipeline body (13) is fixedly connected to a dust removal pump (22), the output end of the dust removal pump (22) is fixedly connected to a dust exhaust pipe (23), and the input end of the dust removal pump (22) is fixedly connected to the inside of the pipeline body (13).

7. A central air conditioning ventilation duct according to claim 6, characterized in that: A filter plate (24) is fixedly connected inside the pipe body (13), and the filter plate (24) is arranged at both ends inside the pipe body (13). An air supply pipe (25) is fixedly connected to the outer wall of the pipe body (13), and a splicing plate (26) is fixedly connected to the outer wall of the air supply pipe (25).

8. A central air conditioning ventilation duct according to claim 7, characterized in that: A dustproof plate (27) is fixedly connected inside the splicing plate (26), an air outlet pipe (28) is fixedly connected to the lower surface of the air supply pipe (25), and a second filter plate (29) is fixedly connected inside the air outlet pipe (28).