Duct air volume regulating device

Abstract

The application discloses a pipeline air volume adjusting device, relates to the field of air volume adjusting devices, and comprises a shielding piece, a mounting pipe and a moving assembly; the mounting pipe is provided with an air outlet, and the mounting pipe is used for being connected with a pipeline main body, so that airflow in the pipeline main body is discharged from the air outlet; the shielding piece is in sliding connection with the mounting pipe; the shielding piece is provided with a shielding surface, and the shielding surface is a conical surface; the moving assembly is connected with the shielding piece, and the moving assembly is used for driving the shielding surface to be inserted into or separated from the air outlet. The application has the effect of improving the performance detection efficiency and precision of the fan.

Description

Technical Field

[0001] This application relates to the field of air volume regulating devices, and more particularly to a duct air volume regulating device. Background Technology

[0002] In the process of wind turbine performance testing, the ventilation resistance of the duct system is usually changed by changing the ventilation area of ​​the duct system, thereby obtaining the performance data of the wind turbine under different resistance conditions, and then plotting the performance curve of the wind turbine.

[0003] Currently, the adjustment of the ventilation area of ​​ducts is usually achieved manually. This involves operators placing baffles inside the duct and adjusting the degree of obstruction of the duct cross-section by the baffles to change the effective ventilation area of ​​the duct, thereby obtaining different ventilation resistance conditions.

[0004] However, in the above-mentioned resistance adjustment methods, the placement of the baffle and the degree of obstruction of the duct cross-section depend on the operator's subjective judgment, making it difficult to accurately and continuously control the ventilation area. At the same time, each change in resistance conditions requires manual readjustment or placement of the baffle, which is cumbersome and time-consuming, affecting the overall efficiency of fan performance testing. Summary of the Invention

[0005] To improve the efficiency and accuracy of fan performance testing, this application provides a duct airflow regulating device.

[0006] This application provides a duct air volume regulating device, which adopts the following technical solution: A duct airflow regulating device includes a shield, a mounting pipe, and a moving component; The mounting pipe is provided with an air outlet, and the mounting pipe is used to connect to the duct body so that the airflow in the duct body is discharged from the air outlet. The shielding component is slidably connected to the mounting pipe; the shielding component is provided with a shielding surface, which is a conical surface; the moving component is connected to the shielding component, and the moving component is used to drive the shielding surface to insert into or disengage from the air outlet.

[0007] By adopting the above technical solution, the shielding surface is a cone, and an annular flow gap is formed between the cone and the air outlet. The moving component drives the shielding part to slide along the axial direction of the installation pipe, so that the depth of the cone inserted into the air outlet changes continuously, thereby making the flow area of ​​the annular gap change continuously, realizing the continuous adjustment of the ventilation resistance of the pipeline, reducing the workload of manual adjustment, and improving the detection efficiency.

[0008] Optionally, it also includes a guide rod, which is connected to the shield and slidably connected to the mounting tube.

[0009] By adopting the above technical solution, the guide rod supports and guides the sliding direction of the shielding component, allowing the shielding component to move along the axial direction of the mounting tube, reducing the possibility of the shielding component deviating during movement and improving the stability of the shielding component's movement.

[0010] Optionally, the moving component includes a moving drive, a transmission rod, and a connecting seat; The moving drive component is mounted on the shielding component, and the connecting seat is mounted on the mounting tube; one end of the transmission rod is connected to the output end of the moving drive component, and the other end is threadedly connected to the connecting seat; the transmission rod is rotatably connected to the shielding component.

[0011] By adopting the above technical solution, the moving drive component drives the transmission rod to rotate. The transmission rod engages with the connecting seat on the mounting tube via a threaded connection, converting the rotation into linear displacement of the blocking component along the axial direction of the mounting tube. This achieves automated and precise control of the blocking component's position, reducing reliance on manual operation.

[0012] Optionally, it also includes a first limit switch; the first limit switch is disposed on the connecting base; the first limit switch is electrically connected to the moving drive component; When the blocking member moves to the point where the first limit switch is triggered, the blocking member stops moving towards the mounting tube.

[0013] By adopting the above technical solution, when the blocking component moves towards the mounting tube and triggers the first limit switch, the moving drive component stops working, causing the blocking component to automatically stop moving. This reduces the possibility of the blocking component colliding with the mounting tube due to continuous movement and improves the reliability of the device operation.

[0014] Optionally, it also includes a second limit switch and a limit plate; the limit plate is disposed on the transmission rod, the second limit switch is disposed on the connecting seat, and the second limit switch is electrically connected to the moving drive component; The transmission rod moves to the limiting plate, triggering the second limit switch, causing the blocking component to stop moving away from the mounting tube.

[0015] By adopting the above technical solution, the blocking component moves away from the mounting tube, so that when the limit plate on the transmission rod triggers the second limit switch, the moving drive component stops working. This reduces the possibility that the blocking component will exceed the design stroke range and leave the support and guidance range of the guide rod, thereby improving the reliability of the device operation.

[0016] Optionally, the shielding component includes a shielding base and a base plate; the shielding base is connected to the base plate; and the shielding surface is disposed on the shielding base. The moving drive component is mounted on the base plate, the connecting seat is located inside the mounting tube, and the transmission rod is rotatably connected to the shielding seat.

[0017] By adopting the above technical solution, the connecting seat is installed inside the mounting tube, so that when the moving drive component moves the base plate, the shielding seat can move along the axial direction of the mounting tube, thereby allowing the shielding surface to be inserted into the air outlet.

[0018] Optionally, it also includes an opening assembly; the shielding base is provided with multiple air inlets, and the base plate is provided with an exhaust port; The opening assembly is used to open or close the air inlet; when the shield moves to its limit position away from the mounting tube, the opening assembly opens the air inlet, making the air inlet connected to the exhaust port.

[0019] By adopting the above technical solution, an air inlet is provided on the shielding seat and an air outlet is provided on the base plate. When the conical surface moves away from the installation pipe to the limit position of the stroke, the air inlet is opened by the opening component, so that the airflow can pass through the shielding part itself through the air inlet and the air outlet, further increasing the effective flow area of ​​the pipe, thereby further reducing the ventilation resistance and expanding the ventilation resistance adjustment range that this device can obtain.

[0020] Optionally, the opening assembly includes a cover seat and a cover drive; the cover seat is disposed inside the shielding seat; the cover seat is rotatably connected to the base plate; and the cover seat is provided with a ventilation opening. The cover drive unit drives the cover seat to rotate, so that when the vent is connected to the air inlet, the air inlet, the vent and the exhaust are connected. The cover drive unit drives the cover seat to rotate, so that when the vent and the air inlet are misaligned, the connection between the air inlet, the vent and the exhaust port is broken.

[0021] By adopting the above technical solution, the rotation angle of the cover seat is controlled, so that the overlap between the vent on it and the air inlet on the shield seat changes, thereby controlling the connection and disconnection of the passage between the air inlet, vent and exhaust.

[0022] Optionally, the mounting pipe is provided with a flange for detachable connection to the duct body.

[0023] By adopting the above technical solution, the installation pipe can be detachably connected to the duct body via a flange, which facilitates the relocation of the device to different test pipelines or test stations for repeated use, thereby improving the device's versatility and disassembly efficiency.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By using a conical shielding surface, an annular flow gap is formed between the conical surface and the air outlet. The moving component drives the shielding part to slide along the axial direction of the installation pipe, so that the depth of the conical surface inserted into the air outlet changes continuously, thereby making the flow area of ​​the annular gap change continuously, realizing the continuous adjustment of the ventilation resistance of the pipeline, reducing the workload of manual adjustment and improving the detection efficiency.

[0026] 2. By setting an air inlet on the shielding seat and an air outlet on the base plate, when the conical surface moves away from the installation pipe to the limit position of the stroke, the air inlet is opened by the opening assembly, so that the airflow can pass through the shielding part itself through the air inlet and the air outlet, further increasing the effective flow area of ​​the pipe, thereby further reducing the ventilation resistance and expanding the ventilation resistance adjustment range that this device can obtain.

[0027] 3. By controlling the rotation angle of the cover seat, the overlap between the vent on it and the air inlet on the shield seat changes, thereby controlling the connection and disconnection of the passage between the air inlet, vent and exhaust. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0029] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0030] Figure 3 This is a schematic diagram of the installation tube and moving component in Embodiment 2 of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the shielding component, mounting tube, and moving assembly in Embodiment 2 of this application;

[0032] Figure 5 In Embodiment 2 of this application Figure 4 Enlarged view of a portion of point A inside;

[0033] Figure 6 This is a schematic diagram of the overall structure of Embodiment 3 of this application;

[0034] Figure 7 This is an exploded view of the shielding seat and the sealing seat of Embodiment 3 of this application;

[0035] Figure 8 This is a schematic diagram of the base plate in Embodiment 3 of this application;

[0036] Figure 9 This is a cross-sectional structural diagram of the shielding member and the cover seat in Embodiment 3 of this application;

[0037] Figure 10It is in embodiment 3 of this application Figure 9 Enlarged view of part B inside;

[0038] Figure 11 It is in embodiment 3 of this application Figure 9 A magnified view of the inner C section.

[0039] In the diagram: 1. Shielding component; 11. Shielding seat; 111. Shielding surface; 112. Air inlet; 12. Base plate; 121. Exhaust outlet; 122. Inner ring plate; 123. Outer ring plate; 124. Support seat; 125. Clearance opening; 13. Receiving cavity; 2. Mounting pipe; 21. Air outlet; 22. Flange; 3. Moving assembly; 31. Moving drive component; 32. Transmission rod; 33. Connecting seat; 4. Guide rod; 5. First limit switch; 6. Second limit switch; 7. Limiting plate; 8. Opening assembly; 81. Cover seat; 811. Ventilation opening; 812. First limit step; 813. Second limit step; 82. Cover drive component; 83. Gear ring; 84. Gear; 9. Connecting rod. Detailed Implementation

[0040] The following combination Figures 1-11 This application will be described in further detail.

[0041] Example 1

[0042] Embodiment 1 of this application discloses a duct airflow regulating device, such as Figure 1 As shown, the air volume regulating device includes a shield 1, a mounting pipe 2, and a connecting rod 9.

[0043] Specifically, such as Figure 1 As shown, the shielding component 1 is provided with a shielding surface 111, which is a conical surface. The mounting pipe 2 is provided with a flange 22, and the mounting pipe 2 is detachably connected to the duct body via the flange 22. An air outlet 21 is provided at the end of the mounting pipe 2 facing the shielding component 1. A fan is installed at the end of the duct body away from the mounting pipe 2. After the mounting pipe 2 is connected to the duct body, the airflow generated by the fan can be discharged from the air outlet 21.

[0044] like Figure 1 As shown, in this embodiment 1, three connecting rods 9 are provided, and the three connecting rods 9 are distributed at intervals along the circumference of the mounting tube 2. Each connecting rod 9 passes through the mounting tube 2 and the shielding member 1. Preferably, the connecting rod 9 is a screw.

[0045] like Figure 1 As shown, both the mounting tube 2 and the shielding member 1 have through holes adapted to the connecting rod 9, and the connecting rod 9 passes through the corresponding through holes.

[0046] It should be noted that when it is necessary to test the performance of the fan under different resistance conditions, first loosen the nuts on both sides of the mounting pipe 2 and the shield 1 on the connecting rod 9, and push the shield 1 along the length of the connecting rod 9 to move it, so that the shield surface 111 can be inserted into or removed from the air outlet 21, thereby adjusting the flow area of ​​the annular gap formed between the shield surface 111 and the air outlet 21, which can achieve the adjustment of different resistance conditions.

[0047] After adjustment, tighten the nuts on both sides of the mounting tube 2 and the shielding component 1 respectively, so that the mounting tube 2 and the shielding component 1 are fixed to the connecting rod 9 by the nuts. This fixes the relative position of the shielding component 1 and the mounting tube 2, reduces the possibility of the shielding component 1 moving during the test, and improves the reliability of the test.

[0048] The implementation principle of the pipeline air volume regulating device in Embodiment 1 of this application is as follows: After the mounting pipe 2 is connected to the main body of the air duct via the flange 22, the airflow generated by the fan is discharged through the outlet 21 of the mounting pipe 2. According to the required ventilation resistance conditions, the position of the shielding part 1 relative to the mounting pipe 2 is adjusted by manually loosening the nut on the connecting rod 9, so that the shielding surface 111 is inserted into the outlet 21 to the corresponding depth, and then the nut is tightened to fix the position, thereby obtaining the test conditions under the corresponding resistance conditions.

[0049] Example 2

[0050] Embodiment 2 of this application discloses a duct airflow regulating device, such as Figure 2 and Figure 3 As shown, the duct airflow regulating device includes a shield 1, an installation pipe 2, a moving component 3, a guide rod 4, a first limit switch 5, and a second limit switch 6.

[0051] Specifically, such as Figure 2 and Figure 4 As shown, the shielding component 1 includes a shielding seat 11 and a base plate 12. The shielding seat 11 is a hollow conical shell structure, and the outer wall of the shielding seat 11 is a conical shielding surface 111. The shielding seat 11 is fixedly connected to the base plate 12, and the shielding seat 11 and the base plate 12 enclose a receiving cavity 13.

[0052] like Figure 2 As shown, an air outlet 21 is provided at the end of the mounting pipe 2 facing the shield 1, and a flange 22 is provided at the end of the mounting pipe 2 away from the air outlet 21. Multiple bolt holes are provided on the flange 22, which is detachably connected to the corresponding flange on the duct body via bolts. A fan is installed at the end of the duct body away from the mounting pipe 2. After the mounting pipe 2 is connected to the duct body, the airflow generated by the fan can be discharged from the air outlet 21.

[0053] like Figure 3As shown, three guide rods 4 are provided, which are distributed at intervals along the circumference of the mounting tube 2. One end of the guide rod 4 is fixedly connected to the base plate 12, and the other end is slidably connected to the mounting tube 2. By setting the guide rods 4, the movement direction of the blocking component 1 is guided and supported, so that the blocking component 1 can move along its axial direction on the mounting tube 2, reducing the possibility of the blocking component 1 deflecting during the movement.

[0054] like Figure 4 and Figure 5 As shown, the moving assembly 3 includes a moving drive component 31, a transmission rod 32, and a connecting seat 33. The body of the moving drive component 31 is fixedly mounted on the base plate 12, and the output end of the moving drive component 31 is fixedly connected to one end of the transmission rod 32. The connecting seat 33 is fixed to the inside of the mounting tube 2 by bolts. The other end of the transmission rod 32 passes through the receiving cavity 13 and the cone tip of the shielding seat 11 in sequence, and is then threadedly connected to the connecting seat 33. The transmission rod 32 and the cone tip of the shielding seat 11 are connected by a bearing, allowing the transmission rod 32 to rotate relative to the shielding seat 11.

[0055] In this embodiment 2, the moving drive component 31 is a motor. When the moving drive component 31 drives the transmission rod 32 to rotate, the transmission rod 32 generates axial displacement relative to the connecting seat 33 fixed on the mounting pipe 2, and drives the shielding component 1 to move along the axial direction of the mounting pipe 2, so that the shielding surface 111 inserts into or exits the air outlet 21, thereby changing the flow area of ​​the annular gap formed between the shielding surface 111 and the air outlet 21, and realizing continuous adjustment of the ventilation resistance of the pipeline.

[0056] like Figure 5 As shown, the first limit switch 5 is mounted on the connecting base 33 and is electrically connected to the moving drive component 31. When the blocking component 1 moves towards the mounting tube 2 and comes into contact with the first limit switch 5, the first limit switch 5 is triggered, causing the moving drive component 31 to stop working. At this time, the blocking component 1 stops moving towards the mounting tube 2, reducing the possibility of the blocking component 1 colliding with the mounting tube 2 due to continuous movement.

[0057] like Figure 5 As shown, the second limit switch 6 is mounted on the connecting seat 33 and electrically connected to the moving drive component 31; a limit plate 7 is fixedly mounted on the transmission rod 32, and the limit plate 7 is located on the side of the connecting seat 33 away from the blocking seat 11. When the blocking component 1 moves away from the mounting tube 2, the transmission rod 32 synchronously generates axial displacement, causing the limit plate 7 to contact the second limit switch 6 and triggering the second limit switch 6. At this time, the moving drive component 31 stops working, causing the blocking component 1 to stop moving away from the mounting tube 2, reducing the possibility that the movement stroke of the blocking component 1 exceeds the effective support range of the guide rod 4.

[0058] The implementation principle of the pipeline air volume regulating device in Embodiment 2 of this application is as follows: Before testing, the installation pipe 2 is connected to the main body of the air duct through the flange 22, so that the airflow generated by the fan can be discharged from the outlet 21.

[0059] During testing, the moving drive component 31 drives the transmission rod 32 to rotate, and the transmission rod 32 generates axial displacement relative to the connecting seat 33, causing the shielding component 1 to slide axially along the mounting pipe 2, so that the shielding surface 111 is gradually inserted or removed from the air outlet 21, thereby realizing continuous adjustment of the duct ventilation resistance and obtaining the fan working performance under different resistance conditions.

[0060] Example 3

[0061] The difference between Embodiment 3 and Embodiment 2 of this application is as follows:

[0062] like Figure 6 As shown, the duct airflow regulating device of Embodiment 3 of this application also includes an opening assembly 8.

[0063] like Figure 7 and Figure 8 As shown, the shielding base 11 has multiple sets of air inlets 112, each set of air inlets 112 includes multiple air inlets 112, and the multiple sets of air inlets 112 are evenly spaced along the circumference of the shielding base 11.

[0064] like Figure 7 , Figure 8 and Figure 9 As shown, the opening assembly 8 includes a cover seat 81 and a cover drive member 82. The cover seat 81 is generally a conical structure adapted to the inner side wall of the shield seat 11. The cover seat 81 is installed on the inner side of the shield seat 11, and the outer side wall of the cover seat 81 is in contact with the inner side wall of the shield seat 11.

[0065] It should be noted that, as Figure 8 As shown, since the sealing seat 81 needs to rotate relative to the shielding seat 11 and the base plate 12, in this embodiment 3, the base plate 12 is divided into two parts: an inner ring plate 122 and an outer ring plate 123. An annular clearance opening 125 is formed between the inner ring plate 122 and the outer ring plate 123. The inner ring plate 122 and the outer ring plate 123 are fixedly connected by multiple support seats 124, and the shielding seat 11 is fixedly connected to the outer ring plate 123.

[0066] like Figure 6 and Figure 10As shown, one end of the capping seat 81 passes through the clearance opening 125 and is fixedly connected to a gear ring 83. The body of the capping drive component 82 is fixedly mounted on the outer ring plate 123. A gear 84 is fixedly connected to the output end of the capping drive component 82, and the gear 84 meshes with the gear ring 83. The guide rod 4 is fixedly connected to the outer ring plate 123. In this embodiment 3, the capping drive component 82 is a motor. When the capping drive component 82 drives the gear ring 83 to rotate through the gear 84, it can drive the capping seat 81 to rotate relative to the base plate 12 and the shielding seat 11.

[0067] In addition, such as Figure 11 As shown, the cover seat 81 is provided with a first limiting step 812 and a second limiting step 813. The first limiting step 812 and the second limiting step 813 are located on both sides of the clearance opening 125. The first limiting step 812 and the second limiting step 813 can restrict the cover seat 81 from coming off the base plate 12, thereby improving the reliability of the cover seat 81 rotating on the base plate 12.

[0068] like Figure 7 and Figure 8 As shown, the cover seat 81 has multiple ventilation openings 811, and the circumferential distribution of the multiple ventilation openings 811 corresponds to multiple sets of air inlets 112. The inner ring plate 122 has multiple exhaust ports 121.

[0069] It should be noted that when the cover drive 82 drives the cover seat 81 to rotate until the vent 811 and the air inlet 112 are aligned and overlapped, the airflow can pass through the air inlet 112 and the vent 811 in sequence into the receiving cavity 13, and then be discharged through the exhaust port 121. When the cover drive 82 drives the cover seat 81 to rotate until the positions of the vent 811 and the air inlet 112 are misaligned, the outer wall of the cover seat 81 will block the air inlet 112, thus disconnecting the connection between the air inlet 112, the vent 811 and the exhaust port 121.

[0070] When the cover drive 82 drives the cover seat 81 to rotate until the position of the vent 811 and the air inlet 112 is misaligned, the connection between the air inlet 112, the vent 811 and the exhaust vent 121 is broken. At this time, the shield 1 is inserted into or removed from the exhaust vent 21 to realize the continuous adjustment of the duct ventilation resistance.

[0071] When the shielding member 1 moves to its limit position away from the mounting pipe 2, the cover driving member 82 drives the cover seat 81 to rotate until the vent 811 and the air inlet 112 are aligned and overlapped, so that the air inlet 112, the vent 811 and the exhaust vent 121 are connected, which can further reduce the resistance of the shielding member 1 to the airflow, thereby expanding the range of resistance adjustment.

[0072] The implementation principle of the pipeline air volume regulating device in Embodiment 3 of this application is as follows:

[0073] When the shielding member 1 moves away from the mounting pipe 2 and triggers the second limit switch 6 on the limit plate 7, the cover driving member 82 drives the cover seat 81 to rotate, so that the vent 811 and the air inlet 112 are connected to each other. At this time, the airflow can pass through the shielding member 1 itself through the air inlet 112, the vent 811 and the exhaust port 121, further increasing the effective flow area of ​​the pipe, thereby further reducing the ventilation resistance and expanding the ventilation resistance adjustment range that the device can obtain.

[0074] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A duct air volume regulating device, characterized in that, It includes a shield (1), a mounting tube (2), and a moving assembly (3); The mounting pipe (2) is provided with an air outlet (21). The mounting pipe (2) is used to connect with the main body of the air duct so that the airflow in the main body of the air duct is discharged from the air outlet (21). The shielding component (1) is slidably connected to the mounting tube (2); the shielding component (1) is provided with a shielding surface (111), which is a conical surface; the moving component (3) is connected to the shielding component (1), and the moving component (3) is used to drive the shielding surface (111) to insert into or remove from the air outlet (21).

2. The duct air volume regulating device according to claim 1, characterized in that, It also includes a guide rod (4), which is connected to the shield (1) and is slidably connected to the mounting tube (2).

3. The duct air volume regulating device according to claim 1, characterized in that, The moving component (3) includes a moving drive (31), a transmission rod (32), and a connecting seat (33). The moving drive component (31) is disposed on the shielding component (1), and the connecting seat (33) is disposed on the mounting tube (2); one end of the transmission rod (32) is connected to the output end of the moving drive component (31), and the other end is threadedly connected to the connecting seat (33); the transmission rod (32) is rotatably connected to the shielding component (1).

4. A duct air volume regulating device according to claim 3, characterized in that, It also includes a first limit switch (5); the first limit switch (5) is disposed on the connecting seat (33); the first limit switch (5) is electrically connected to the moving drive (31); When the blocking member (1) moves to the point of triggering the first limit switch (5), the blocking member (1) stops moving towards the mounting tube (2).

5. A duct air volume regulating device according to claim 3, characterized in that, It also includes a second limit switch (6) and a limit plate (7); the limit plate (7) is disposed on the transmission rod (32), the second limit switch (6) is disposed on the connecting seat (33), and the second limit switch (6) is electrically connected to the moving drive (31); The transmission rod (32) moves to the limiting plate (7) and triggers the second limiting switch (6), causing the blocking member (1) to stop moving away from the mounting tube (2).

6. A duct air volume regulating device according to claim 3, characterized in that, The shielding component (1) includes a shielding seat (11) and a base plate (12); the shielding seat (11) is connected to the base plate (12); the shielding surface (111) is disposed on the shielding seat (11); The moving drive component (31) is mounted on the base plate (12), the connecting seat (33) is mounted on the inner side of the mounting tube (2), and the transmission rod (32) is rotatably connected to the shielding seat (11).

7. A duct air volume regulating device according to claim 6, characterized in that, It also includes an opening assembly (8); the shielding base (11) is provided with a plurality of air inlets (112), and the base plate (12) is provided with an exhaust port (121). The opening assembly (8) is used to open or close the air inlet (112); when the shield (1) moves to its limit position away from the mounting tube (2), the opening assembly (8) opens the air inlet (112) so that the air inlet (112) is connected to the exhaust port (121).

8. A duct air volume regulating device according to claim 7, characterized in that, The opening assembly (8) includes a cover seat (81) and a cover drive (82); the cover seat (81) is disposed inside the shield seat (11); the cover seat (81) is rotatably connected to the base plate (12); and a vent (811) is provided on the cover seat (81). The capping drive (82) drives the capping seat (81) to rotate, so that when the vent (811) is connected to the air inlet (112), the air inlet (112), the vent (811) and the exhaust port (121) are connected. The cover drive (82) drives the cover seat (81) to rotate, so that when the vent (811) is misaligned with the air inlet (112), the connection between the air inlet (112), the vent (811) and the exhaust port (121) is broken.

9. A duct air volume regulating device according to claim 1, characterized in that, The mounting pipe (2) is provided with a flange (22), which is used to detachably connect to the duct body.

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