Laminar flow heating and ventilation pipeline

Abstract

The utility model relates to the field of heating and ventilation pipelines, in particular to a laminar flow heating and ventilation pipeline which comprises a connecting assembly, a flow dividing assembly connected to the connecting assembly, a rotating assembly connected to the flow dividing assembly and a smoke conveying assembly connected to the rotating assembly. An air source is connected to the smoke spraying assembly, smoke is sprayed out from the interior of the rotating assembly 3, gas mixed with the smoke is sensed through the smoke sensor 607 so that whether airflow is straight and free of vortex or not can be observed, meanwhile, the transverse impact of centrifugal force on the airflow is reduced through the fixed elbow 601 with the ratio of the curvature radius to the diameter larger than or equal to 2, and therefore the airflow is prevented from being damaged. Compared with a right-angle elbow, the pressure loss can be reduced by 40%-60%, so that the airflow steering is smoother, the forward movement of a flow separation point is avoided, the pipeline can maintain laminar flow and is high in system reliability without additional devices and only depending on geometric design, and meanwhile, the vortex falling noise of a small-curvature elbow is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heating and ventilation pipeline, especially to a laminar flow heating and ventilation pipeline. BACKGROUND

[0002] The laminar flow heating and ventilation pipeline refers to a pipeline designed with laminar flow in a heating ventilation air conditioning (HVAC) system, and its core purpose is to achieve highly clean and uniformly distributed air delivery in a specific environment. Laminar flow is a flow state of fluid (such as air), characterized by stratified and stable flow pattern with little mixing between layers, commonly found in low flow rate or high viscosity fluids. Unlike turbulent flow (chaotic and irregular flow), laminar flow can reduce particle diffusion and energy loss. The laminar flow heating and ventilation pipeline is widely used in operating rooms, laboratories, electronic chip workshops, pharmaceutical factories, etc. Through laminar flow, air disturbance can be avoided, preventing the spread of pollutants (dust, bacteria), while stabilizing air distribution and avoiding local temperature fluctuations. It is usually combined with HEPA / ULPA filters to deliver clean air in a specific direction.

[0003] However, in the existing laminar flow heating and ventilation pipeline, the airflow at the elbow will generate centrifugal force due to the change of direction, causing the flow rate to increase on the outside and decrease on the inside, forming a transverse pressure gradient and triggering boundary layer separation, resulting in laminar flow instability at the elbow. SUMMARY

[0004] To overcome the problem that the existing laminar flow heating and ventilation pipeline will change direction when the airflow moves to the elbow, causing uneven flow rate inside and outside under the action of centrifugal force, resulting in airflow disturbance inside the laminar flow heating and ventilation pipeline, and further affecting the normal use of the laminar flow heating and ventilation pipeline.

[0005] The technical solution of the utility model is a laminar flow heating and ventilation pipeline, which includes a connection assembly, a shunt assembly connected to the connection assembly, a rotating assembly connected to the shunt assembly, a smoke delivery assembly connected to the rotating assembly, a flow guide assembly connected to the inner wall of the rotating assembly, a compensation assembly connected to the rotating assembly, and an exhaust assembly connected to the compensation assembly. The connection assembly is used to correct the airflow direction of the gas flowing through the inside of the connection assembly. The shunt assembly is used to evenly distribute the air speed of the gas flowing through the inside of the shunt assembly. The rotating assembly is used to drive the smoke output by the smoke delivery assembly to rotate around the central axis of the rotating assembly. The flow guide assembly is used to adjust the flow rate of the airflow flowing through the flow guide assembly.

[0006] The smoke delivery assembly includes a matching block connected to the rotating assembly, a fixed strip connected to the matching block, and a smoke injection assembly connected to the fixed strip. The smoke injection assembly is used to inject smoke and mix with the gas inside the rotating assembly.

[0007] The compensation component includes a fixed elbow connected to the rotating component, a blade assembly connected to the fixed elbow, a discharge pipe connected to the fixed elbow, a splicing ring connected to the discharge pipe, a first filter connected to the splicing ring, and a smoke sensor connected to the outer surface of the fixed elbow. The blade assembly is used to reduce the lateral impact of centrifugal force on the airflow entering the fixed elbow, and to reduce airflow separation and secondary flow. The smoke sensor is used to obtain the flow state of smoke in the gas flowing through the fixed elbow.

[0008] Preferably, the smoke spraying assembly includes a smoke generator connected to a fixed strip, an air supply pipe connected to the input end of the smoke generator, an air supply pipe connected to the output end of the smoke generator, a fixed cover connected to the air supply pipe, and a smoke nozzle connected to the fixed cover. The smoke generator and the fixed cover are connected through the air supply pipe, which is used to drive the smoke generated by the smoke generator into the interior of the fixed cover.

[0009] Preferably, the blade assembly includes a blade ring connected to the fixed elbow and a plurality of guide blades connected to the blade ring. The plurality of guide blades are arranged in a circular shape with the central axis of the blade ring as the axis. The guide blades are used to divide a single large vortex flowing through the fixed elbow into multiple small vortices. The ratio of the radius of curvature of the fixed elbow to the diameter of the fixed elbow is ≥2.

[0010] Preferably, the rotating assembly includes a rotating sleeve connected to the smoke nozzle, a combined tube movably connected to the rotating sleeve, a fitting groove formed on the combined tube, a meshing ring connected to the rotating sleeve, a fixed tube movably connected to the rotating sleeve, a motor frame connected to the fixed tube, a servo motor connected to the motor frame, and a meshing wheel connected to the output shaft of the servo motor. The meshing wheel meshes with the meshing ring, and the servo motor is used to drive the rotating sleeve to rotate around its own central axis.

[0011] Preferably, the flow splitting assembly includes a flow splitting pipe connected to a fixed pipe, a fixed ring connected to the flow splitting pipe, a flow splitting disk connected to the fixed ring, and a plurality of flow splitting grooves formed on the flow splitting disk. The flow splitting disk and the flow splitting grooves are used to correct the airflow direction through the flow splitting pipe and restore the laminar flow state.

[0012] Preferably, the connecting assembly includes a fixed cone sleeve connected to the splitter pipe, a plurality of fixed plates and a plurality of guide plates connected inside the fixed cone sleeve, and an adjusting assembly connected to the fixed cone sleeve. The fixed plates and guide plates are configured to correspond one-to-one, and the fixed cone sleeve is used to suppress turbulence generated inside the fixed cone sleeve.

[0013] Preferably, the adjusting assembly includes a connector connected to a fixed conical sleeve, a flange ring connected to the outer surface of the connector, a connecting spring connected to the inner wall of the connector, a fixing head connected to the connecting spring, a connecting rod connected to the fixing head, and a sealing head connected to the connecting rod, wherein the sealing head is used to seal one end of the connector.

[0014] Preferably, the flow guiding assembly includes a combined ring connected to the combined pipe, a plurality of mounting heads connected to the combined ring, spring clips connected to the mounting heads, a flow guiding plate connected to the spring clips, a mounting groove formed on the flow guiding plate, and a counterweight block movably connected to the flow guiding plate. The counterweight block is used to increase the weight of the flow guiding plate, the spring clips are used to drive the rotated flow guiding plate to reset, the mounting groove is used to install the counterweight block, and the flow guiding plate is used to adjust the flow rate of the gas flowing through the flow guiding plate.

[0015] Preferably, the discharge assembly includes a connecting ring connected to the discharge pipe, a second filter connected to the connecting ring, and a fan assembly connected to the discharge pipe.

[0016] Preferably, the fan assembly includes a mounting frame connected to the discharge pipe, a plurality of mounting holes opened on the mounting frame, a sparkless fan connected to the mounting frame, and an exhaust pipe connected to the sparkless fan. The sparkless fan is used to drive the gas inside the discharge pipe to the exhaust pipe.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model connects the gas source to the smoke spraying assembly and sprays smoke inside the rotating assembly 3. The smoke sensor 607 senses the gas mixed with smoke to observe whether the airflow is straight and without vortices. At the same time, the fixed elbow 601 with a curvature radius to diameter ratio ≥2 reduces the lateral impact of centrifugal force on the airflow, reduces airflow separation and secondary flow. Compared with right-angle elbows, the pressure loss can be reduced by 40% to 60%, so that the airflow turns more gently and avoids the flow separation point from moving forward. Thus, this pipeline can maintain laminar flow without additional devices, relying solely on geometric design. The system has high reliability and eliminates the vortex shedding noise of small curvature elbows.

[0019] 2. This utility model uses a guide plate 503 connected by a spring clip 506 to make the blades droop due to gravity when the inside of the pipe is at low speed, thus reducing the guiding effect and adapting to low flow. When the inside of the pipe is at high speed, the airflow pushes the blades to unfold, enhancing the guiding effect. This allows the laminar flow HVAC pipe to adapt to flow changes without external control to a certain extent. At the same time, the spring clip 506 provides a restoring force when the airflow pressure pushes the guide plate 503 to deflect, which can significantly reduce the overall cost of using the laminar flow HVAC pipe.

[0020] 3. This utility model uses the fixed conical sleeve 107 to balance the flow velocity by changing the cross-section of the fixed conical sleeve 107, thereby suppressing turbulence and stabilizing the flow velocity by utilizing the principle of fluid continuity, thus reducing the risk of turbulence. At the same time, the guide vanes 109 set on the fixed conical sleeve 107 decompose large-scale eddies into small eddies, accelerate energy dissipation, and restore laminar flow. Meanwhile, the airflow entering from the connector 101 can compress the connecting spring 103 to deform, causing the sealing head 106 to separate from the connector 101, allowing the airflow to flow out through the gap between the sealing head 106 and the connector 101, thereby balancing the gas entering the fixed conical sleeve 107. At the same time, the connecting spring 103 ensures that when no airflow enters, the sealing head 106 can seal one end of the connector 101. Attached Figure Description

[0021] Figure 1 The diagram shown is a first three-dimensional structural schematic of the laminar flow HVAC duct of this utility model.

[0022] Figure 2 The diagram shown is a second three-dimensional structural schematic of the laminar flow HVAC duct of this utility model.

[0023] Figure 3 The diagram shown is a three-dimensional structural schematic of the connection component of the laminar flow HVAC duct of this utility model.

[0024] Figure 4 The diagram shown is a three-dimensional structural schematic of the flow distribution component of the laminar flow HVAC duct of this utility model.

[0025] Figure 5 The diagram shown is a three-dimensional structural schematic of the rotating component of the laminar flow HVAC duct of this utility model.

[0026] Figure 6 The diagram shown is a first three-dimensional structural schematic of the smoke supply assembly of the laminar flow HVAC duct of this utility model.

[0027] Figure 7 The diagram shown is a second three-dimensional structural schematic of the smoke supply assembly of the laminar flow HVAC duct of this utility model.

[0028] Figure 8 The diagram shown is a three-dimensional structural schematic of the flow guiding component of the laminar flow HVAC duct of this utility model.

[0029] Figure 9 The diagram shown is a three-dimensional structural schematic of the compensating component for laminar flow HVAC pipes of this utility model.

[0030] Figure 10 The diagram shown is a three-dimensional structural schematic of the discharge assembly of the laminar flow HVAC duct of this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1. Connecting assembly; 2. Diverting assembly; 3. Rotating assembly; 4. Smoke supply assembly; 5. Guide assembly; 6. Compensating assembly; 7. Discharge assembly; 101. Connecting head; 102. Flange ring; 103. Connecting spring; 104. Fixing head; 105. Connecting rod; 106. Sealing head; 107. Fixing cone sleeve; 108. Fixing plate; 109. Guide plate; 201. Diverting pipe; 202. Fixing ring; 203. Diverting plate; 204. Diverting groove; 301. Fixing pipe; 302. Rotating sleeve; 303. Engaging ring; 304. Combined pipe; 305. Fitting groove; 306. Motor frame; 307. Servo motor; 308. 401. Adhesive wheel; 402. Fixing strip; 403. Smoke generator; 404. Air source pipe; 405. Air supply pipe; 406. Fixing cover; 407. Smoke nozzle; 501. Combination ring; 502. Mounting head; 503. Guide plate; 504. Mounting groove; 505. Counterweight; 506. Spring clip; 601. Fixing elbow; 602. Blade ring; 603. Guide blade; 604. Discharge pipe; 605. Assembly ring; 606. First filter; 607. Smoke sensor; 701. Connecting ring; 702. Second filter; 703. Lifting frame; 704. Lifting hole; 705. Sparkless fan; 706. Air outlet pipe. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] A type of laminar flow HVAC duct, according to Figures 1-10As shown, it includes a connecting component 1, a diversion component 2 connected to the connecting component 1, a rotating component 3 connected to the diversion component 2, a smoke delivery component 4 connected to the rotating component 3, a guide component 5 connected to the inner wall of the rotating component 3, a compensation component 6 connected to the rotating component 3, and an exhaust component 7 connected to the compensation component 6. The connecting component 1 is used to correct the airflow direction of the gas flowing through the connecting component 1. The diversion component 2 is used to even out the wind speed of the gas flowing through the diversion component 2. The rotating component 3 is used to drive the smoke output by the smoke delivery component 4 to rotate around the central axis of the rotating component 3. The guide component 5 is used to adjust the flow rate change of the airflow passing through the guide component 5.

[0034] The smoke delivery assembly 4 includes a bonding block 401 connected to the rotating assembly 3, a fixing strip 402 connected to the bonding block 401, and a smoke spraying assembly connected to the fixing strip 402. The smoke spraying assembly is used to spray smoke and mix it with the gas inside the rotating assembly 3.

[0035] The compensation component 6 includes a fixed elbow 601 connected to the rotating component 3, a blade assembly connected to the fixed elbow 601, a discharge pipe 604 connected to the fixed elbow 601, a splicing ring 605 connected to the discharge pipe 604, a first filter 606 connected to the splicing ring 605, and a smoke sensor 607 connected to the outer surface of the fixed elbow 601. The blade assembly is used to reduce the lateral impact of centrifugal force on the airflow entering the fixed elbow 601, and to reduce airflow separation and secondary flow. The smoke sensor 607 is used to obtain the flow state of smoke in the gas flowing through the fixed elbow 601.

[0036] It should be noted that by connecting the gas source to the smoke injection assembly and spraying smoke inside the rotating assembly 3, the smoke sensor 607 senses the gas mixed with smoke to observe whether the airflow is straight and without vortices. At the same time, the fixed elbow 601 with a curvature radius to diameter ratio ≥2 reduces the lateral impact of centrifugal force on the airflow, reduces airflow separation and secondary flow, and thus reduces pressure loss by 40% to 60% compared to a right-angle elbow, making the airflow turn more gently and avoiding the flow separation point from moving forward. This allows the pipeline to maintain laminar flow without additional devices, relying solely on geometric design, resulting in high system reliability and eliminating the vortex shedding noise of small curvature elbows.

[0037] according to Figures 5-7As shown, the smoke spraying assembly includes a smoke generator 403 connected to a fixing bar 402, an air supply pipe 404 connected to the input end of the smoke generator 403, an air supply pipe 405 connected to the output end of the smoke generator 403, a fixing cover 406 connected to the air supply pipe 405, and a smoke nozzle 407 connected to the fixing cover 406. The smoke generator 403 and the fixing cover 406 are connected through the air supply pipe 405, which is used to drive the smoke generated by the smoke generator 403 into the interior of the fixing cover 406.

[0038] according to Figure 9 As shown, the blade assembly includes a blade ring 602 connected to a fixed elbow 601 and several guide blades 603 connected to the blade ring 602. The several guide blades 603 are arranged in a circular shape with the central axis of the blade ring 602 as the axis. The guide blades 603 are used to divide the single large vortex flowing through the fixed elbow 601 into multiple small vortices. The ratio of the radius of curvature of the fixed elbow 601 to the diameter of the fixed elbow 601 is ≥2.

[0039] It should be noted that by using several guide vanes 603 to divide the single large vortex entering the fixed bend 601 into multiple small vortices, energy dissipation is accelerated. At the same time, the vane curvature matches the bend, forcing the airflow to turn along a predetermined path, avoiding boundary layer separation. This reduces the pressure loss coefficient ξξ from 0.25 to 0.08-0.12, reduces energy consumption by more than 50%, and reduces the turbulence intensity of the airflow within 1-2 times the pipe diameter downstream by 70%, shortening the time to achieve cleanliness standards, thereby reducing impact on the outer wall surface and reducing the risk of dust accumulation by 40%-60%.

[0040] according to Figures 5-7 As shown, the rotating assembly 3 includes a rotating sleeve 302 connected to the smoke nozzle 407, a combined tube 304 movably connected to the rotating sleeve 302, a fitting groove 305 formed on the combined tube 304, a meshing ring 303 connected to the rotating sleeve 302, a fixed tube 301 movably connected to the rotating sleeve 302, a motor frame 306 connected to the fixed tube 301, a servo motor 307 connected to the motor frame 306, and a meshing wheel 308 connected to the output shaft of the servo motor 307. The meshing wheel 308 meshes with the meshing ring 303, and the servo motor 307 is used to drive the rotating sleeve 302 to rotate around its own central axis.

[0041] It should be noted that the servo motor 307 drives the meshing wheel 308 to rotate, and the rotating meshing wheel 308 drives the meshing ring 303 to rotate, so that the rotating sleeve 302 can rotate synchronously. This allows the smoke nozzle 407 connected to the rotating sleeve 302 to rotate circumferentially around the central axis of the rotating sleeve 302, thereby improving the mixing efficiency of smoke and airflow to a certain extent.

[0042] according to Figure 4 As shown, the flow splitting assembly 2 includes a flow splitting pipe 201 connected to the fixed pipe 301, a fixed ring 202 connected to the flow splitting pipe 201, a flow splitting disk 203 connected to the fixed ring 202, and a plurality of flow splitting grooves 204 formed on the flow splitting disk 203. The flow splitting disk 203 and the flow splitting grooves 204 are used to correct the airflow direction through the flow splitting pipe 201 and restore the laminar flow state.

[0043] according to Figure 3 As shown, the connecting assembly 1 includes a fixed cone sleeve 107 connected to the splitter pipe 201, a plurality of fixed plates 108 and a plurality of guide plates 109 connected inside the fixed cone sleeve 107, and an adjusting assembly connected to the fixed cone sleeve 107. The fixed plates 108 and the guide plates 109 are configured to correspond one-to-one. The fixed cone sleeve 107 is used to suppress turbulence generated inside the fixed cone sleeve 107.

[0044] It should be noted that by setting the fixed cone sleeve 107, the flow velocity is balanced by the cross-sectional change of the fixed cone sleeve 107, so as to suppress the generation of turbulence, stabilize the flow velocity by utilizing the principle of fluid continuity, and reduce the risk of turbulence. At the same time, the guide vanes 109 set on the fixed cone sleeve 107 decompose large-scale eddies into small eddies, accelerate energy dissipation, and restore laminar flow.

[0045] according to Figure 3 As shown, the adjustment assembly includes a connector 101 connected to the fixed cone sleeve 107, a flange ring 102 connected to the outer surface of the connector 101, a connecting spring 103 connected to the inner wall of the connector 101, a fixing head 104 connected to the connecting spring 103, a connecting rod 105 connected to the fixing head 104, and a sealing head 106 connected to the connecting rod 105. The sealing head 106 is used to seal one end of the connector 101.

[0046] It should be noted that the airflow entering from the connector 101 can compress the connecting spring 103 to deform, causing the sealing head 106 to separate from the connector 101. This allows the airflow to flow out through the gap between the sealing head 106 and the connector 101, thus balancing the gas entering the fixed cone sleeve 107. At the same time, the connecting spring 103 ensures that the sealing head 106 can seal one end of the connector 101 when no airflow is entering.

[0047] according to Figure 8As shown, the flow guiding assembly 5 includes a combined ring 501 connected to the combined pipe 304, a plurality of mounting heads 502 connected to the combined ring 501, a spring clip 506 connected to the mounting head 502, a flow guiding plate 503 connected to the spring clip 506, a mounting groove 504 formed on the flow guiding plate 503, and a counterweight 505 movably connected to the flow guiding plate 503. The counterweight 505 is used to increase the weight of the flow guiding plate 503, the spring clip 506 is used to drive the rotated flow guiding plate 503 to reset, the mounting groove 504 is used to install the counterweight 505, and the flow guiding plate 503 is used to adjust the flow rate of the gas flowing through the flow guiding plate 503.

[0048] It should be noted that the guide plate 503 connected by the spring clip 506 allows the blades to droop due to gravity when the pipe is at low speed, thus reducing the guiding effect and adapting to low flow. When the pipe is at high speed, the airflow pushes the blades to unfold, enhancing the guiding effect. This allows the laminar flow HVAC pipe to adapt to flow changes without external control to a certain extent. At the same time, the spring clip 506 provides a restoring force when the airflow pressure pushes the guide plate 503 to deflect, which can significantly reduce the overall operating cost of the laminar flow HVAC pipe.

[0049] according to Figure 10 As shown, the discharge assembly 7 includes a connecting ring 701 connected to the discharge pipe 604, a second filter 702 connected to the connecting ring 701, and a fan assembly connected to the discharge pipe 604.

[0050] according to Figure 10 As shown, the fan assembly includes a mounting frame 703 connected to the discharge pipe 604, a plurality of mounting holes 704 opened on the mounting frame 703, a sparkless fan 705 connected to the mounting frame 703, and an exhaust pipe 706 connected to the sparkless fan 705. The sparkless fan 705 is used to drive the gas inside the discharge pipe 604 to the exhaust pipe 706.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A laminar flow heating and ventilation duct, characterized in that: The assembly includes a connecting component (1), a diversion component (2) connected to the connecting component (1), a rotating component (3) connected to the diversion component (2), a smoke delivery component (4) connected to the rotating component (3), a guide component (5) connected to the inner wall of the rotating component (3), a compensation component (6) connected to the rotating component (3), and an exhaust component (7) connected to the compensation component (6). The connecting component (1) is used to correct the airflow direction of the gas flowing through the connecting component (1). The diversion component (2) is used to evenly measure the wind speed of the gas flowing through the diversion component (2). The rotating component (3) is used to drive the smoke output by the smoke delivery component (4) to rotate around the central axis of the rotating component (3). The guide component (5) is used to adjust the flow rate change of the airflow passing through the guide component (5). The smoke delivery assembly (4) includes a bonding block (401) connected to the rotating assembly (3), a fixing strip (402) connected to the bonding block (401), and a smoke spraying assembly connected to the fixing strip (402). The smoke spraying assembly is used to spray smoke and mix it with the gas inside the rotating assembly (3). The compensation component (6) includes a fixed elbow (601) connected to the rotating component (3), a blade assembly connected to the fixed elbow (601), a discharge pipe (604) connected to the fixed elbow (601), a splicing ring (605) connected to the discharge pipe (604), a first filter (606) connected to the splicing ring (605), and a smoke sensor (607) connected to the outer surface of the fixed elbow (601). The blade assembly is used to reduce the lateral impact of centrifugal force on the airflow entering the fixed elbow (601), and reduce airflow separation and secondary flow. The smoke sensor (607) is used to obtain the flow state of smoke in the gas flowing through the fixed elbow (601).

2. The laminar flow HVAC duct according to claim 1, characterized in that: The smoke spraying assembly includes a smoke generator (403) connected to a fixing bar (402), an air supply pipe (404) connected to the input end of the smoke generator (403), an air supply pipe (405) connected to the output end of the smoke generator (403), a fixing cover (406) connected to the air supply pipe (405), and a smoke nozzle (407) connected to the fixing cover (406). The smoke generator (403) and the fixing cover (406) are connected through the air supply pipe (405), and the air supply pipe (405) is used to drive the smoke generated by the smoke generator (403) into the interior of the fixing cover (406).

3. A laminar flow HVAC duct according to claim 1, characterized in that: The blade assembly includes a blade ring (602) connected to a fixed elbow (601) and a plurality of guide blades (603) connected to the blade ring (602). The plurality of guide blades (603) are arranged in a circular shape with the central axis of the blade ring (602) as the axis. The guide blades (603) are used to divide the single large vortex flowing through the fixed elbow (601) into multiple small vortices. The ratio of the radius of curvature of the fixed elbow (601) to the diameter of the fixed elbow (601) is ≥2.

4. A laminar flow HVAC duct according to claim 2, characterized in that: The rotating assembly (3) includes a rotating sleeve (302) connected to a smoke nozzle (407), a combined pipe (304) movably connected to the rotating sleeve (302), a fitting groove (305) opened on the combined pipe (304), a meshing ring (303) connected to the rotating sleeve (302), a fixed pipe (301) movably connected to the rotating sleeve (302), a motor frame (306) connected to the fixed pipe (301), a servo motor (307) connected to the motor frame (306), and a meshing wheel (308) connected to the output shaft of the servo motor (307). The meshing wheel (308) meshes with the meshing ring (303), and the servo motor (307) is used to drive the rotating sleeve (302) to rotate around its own central axis.

5. A laminar flow HVAC duct according to claim 4, characterized in that: The diversion assembly (2) includes a diversion pipe (201) connected to a fixed pipe (301), a fixed ring (202) connected to the diversion pipe (201), a diversion disk (203) connected to the fixed ring (202), and a plurality of diversion grooves (204) formed on the diversion disk (203). The diversion disk (203) and the diversion grooves (204) are used to correct the airflow direction through the diversion pipe (201) and restore the laminar flow state.

6. A laminar flow HVAC duct according to claim 5, characterized in that: The connecting assembly (1) includes a fixed cone sleeve (107) connected to the split pipe (201), a plurality of fixed plates (108) and a plurality of guide plates (109) connected inside the fixed cone sleeve (107), and an adjusting assembly connected to the fixed cone sleeve (107). The fixed plates (108) and the guide plates (109) are configured to correspond one-to-one. The fixed cone sleeve (107) is used to suppress turbulence generated inside the fixed cone sleeve (107).

7. A laminar flow HVAC duct according to claim 6, characterized in that: The adjusting assembly includes a connector (101) connected to a fixed cone sleeve (107), a flange ring (102) connected to the outer surface of the connector (101), a connecting spring (103) connected to the inner wall of the connector (101), a fixing head (104) connected to the connecting spring (103), a connecting rod (105) connected to the fixing head (104), and a sealing head (106) connected to the connecting rod (105), wherein the sealing head (106) is used to seal one end of the connector (101).

8. A laminar flow HVAC duct according to claim 4, characterized in that: The flow guiding assembly (5) includes a combined ring (501) connected to the combined pipe (304), a plurality of mounting heads (502) connected to the combined ring (501), a spring clip (506) connected to the mounting head (502), a flow guiding plate (503) connected to the spring clip (506), a mounting groove (504) opened on the flow guiding plate (503), and a counterweight (505) movably connected to the flow guiding plate (503). The counterweight (505) is used to increase the weight of the flow guiding plate (503), the spring clip (506) is used to drive the rotated flow guiding plate (503) to reset, the mounting groove (504) is used to install the counterweight (505), and the flow guiding plate (503) is used to adjust the flow rate of the gas flowing through the flow guiding plate (503).

9. A laminar flow HVAC duct according to claim 1, characterized in that: The discharge assembly (7) includes a connecting ring (701) connected to the discharge pipe (604), a second filter (702) connected to the connecting ring (701), and a fan assembly connected to the discharge pipe (604).

10. A laminar flow HVAC duct according to claim 9, characterized in that: The fan assembly includes a lifting frame (703) connected to the discharge pipe (604), a plurality of lifting holes (704) opened on the lifting frame (703), a sparkless fan (705) connected to the lifting frame (703), and an exhaust pipe (706) connected to the sparkless fan (705). The sparkless fan (705) is used to drive the gas inside the discharge pipe (604) to the exhaust pipe (706).

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