A return air support type flexible air duct

Abstract

The present invention discloses a return air support type flexible air duct, belonging to the technical field of flexible air ducts; it comprises a tube body and a bracket, the tube body is fixedly sleeved on the outside of the bracket, a sealing assembly of the tube body and the bracket is installed on the outside of the tube body, the sealing assembly comprises a fixing ring, the fixing ring is sleeved on the outside of the tube body, the side walls of the fixing ring, the tube body and the bracket are all provided with multiple groups of identical openings, multiple groups of the openings are internally threaded with bolts, the outer side of the fixing ring is rotatably connected with a gear ring, the outer side of the tube body is provided with multiple groups of openings, and multiple groups of fixing boxes are fixedly connected to the outer side of the fixing ring. Under the action of the bolts and the openings, the present invention completes the fastening operation of the bracket and the fixing ring, and then under the action of the baffle, completes the connection operation between the tube body and the fixing ring, and then completes the secondary stabilization operation of the tube body and the bracket, thereby improving the stability between the tube body and the bracket and improving the service life of the tube body.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible air ducts, and in particular to a return air support type flexible air duct. Background Art

[0002] ‌‌Flexible air duct is a flexible pipe made of special fibers. Different from other pipes, flexible air duct has many advantages, including uniform and comfortable air supply, beautiful appearance, anti-condensation, health, energy saving and environmental protection, convenient installation, easy cleaning and maintenance, etc. During the use of flexible air duct, in order to improve the overall stability of the device, corresponding brackets are often installed inside the flexible air duct. The brackets and the pipe body are generally glued together. The overall structure is simple and the cost is low.

[0003] However, in actual use, only glue is used for sticking, and the fixing effect is general. During long-term use, it often causes breakage between the pipe body and the bracket. In addition, a certain amount of substances will accumulate inside the pipe body during long-term use. These substances accumulate in the pipe body and cannot be discharged, which seriously affects the normal operation of the pipe body. The accumulation of substances in the pipe body will also reduce the service life of the pipe body. Sometimes, it can only be cleaned by disassembling the pipe body. The cleaning effect is general and the middle part of the pipe body cannot be cleaned. Therefore, a return air support type flexible duct is provided. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a return air support type flexible air duct.

[0005] The present invention adopts the following technical solutions:

[0006] A return air support type flexible air duct comprises a tube body and a bracket, wherein the tube body is fixedly sleeved on the outer side of the bracket, a sealing assembly of the tube body and the bracket is installed on the outer side of the tube body, the sealing assembly comprises a fixing ring, the fixing ring is sleeved on the outer side of the tube body, the side walls of the fixing ring, the tube body and the bracket are all provided with a plurality of groups of identical openings, a plurality of groups of the openings are internally threadedly sleeved with bolts, a gear ring is rotatably connected to the outer side of the fixing ring, a plurality of groups of openings are provided on the outer side of the tube body, a plurality of groups of fixing boxes are fixedly connected to the outer side of the fixing ring, a plurality of groups of the fixing boxes are rotatably connected with transmission rods, one end of the transmission rod passes through the fixing box, a first gear is fixedly sleeved on the outer side of the transmission rod, the first gear and the gear ring are meshed, the transmission rod is located in the fixing box and is fixedly sleeved with a second gear, a rack is slidably connected in the fixing box, the second gear and the rack are meshed, the rack passes through the fixing box, a baffle is fixedly connected to the rack near one end of the tube body, and the baffle is opposite to the opening.

[0007] The cam is connected with a toothed plate at one end thereof to form a rotation angle with the rotation of the toothed plate, and the toothed plate is connected with a toothed plate at one end thereof to form a rotation angle with the rotation of the toothed plate.

[0008] Preferably, a shaking assembly for controlling the movement of the rotating rod is installed in the baffle, and the shaking assembly includes an annular groove opened on the side wall of the baffle, and two groups of telescopic sleeves are slidably connected in the annular groove, and a movable plate is fixedly connected to the side of the two groups of telescopic sleeves away from the baffle, the movable plate and the rotating plate are slidably connected, and a movable rod is fixedly connected between the movable plate and the rotating rod.

[0009] Preferably, the annular groove is elliptical.

[0010] Preferably, a square plate is fixedly connected to the outer side of the bolt, and the square plate is located on the upper side of the gear ring.

[0011] Preferably, a plurality of groups of sensors are fixedly mounted on the outer circumference of the gear ring, and the plurality of groups of sensors are located between the fixed ring and the square plate.

[0012] Preferably, a rubber sleeve is fixedly sleeved on the outer side of the baffle.

[0013] The beneficial effects of the present invention are:

[0014] 1. First, under the action of bolts and openings, the bracket and the fixing ring are fastened, and then under the action of the baffle, the connection between the pipe body and the fixing ring is completed, and then the secondary stabilization operation of the pipe body and the bracket is completed, thereby improving the stability between the pipe body and the bracket and the service life of the pipe body;

[0015] 2. In addition, during the use of the tube body, the rotating plate and the rotating rod can be driven to rotate by rotating the gear ring, so that the materials accumulated inside the tube body can be better discharged from the opening, thereby ensuring the normal working effect of the tube body. In this process, the rotating plate and the rotating rod rotate, and when the rotating rod and the tube body are against each other, the shaking amplitude of the tube body will be accelerated, further accelerating the material discharge effect;

[0016] 3. At the same time, when the rotating plate rotates, the rotating rod will move back and forth relative to the rotating plate, so that the rotating rod moves away from or close to the rotating plate. The rotating rod moving back and forth can not only clean the material inside the tube body, but also the moving rotating rod always contacts the inner wall of the tube body, so the cleaning effect is good. At the same time, the opening is in the middle part of the tube body, so the middle part of the tube body can be cleaned, and the cleaning effect is good.

[0017] 4. Finally, in actual use, if the sensor does not send out an electrical signal, it means that there is looseness between the square plate and the rack, and corresponding adjustments and maintenance operations are required to complete the self-inspection operation of the entire tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a return air support type flexible air duct proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a pipe body in a return air support type flexible air duct proposed by the present invention;

[0020] Figure 3 This is a top view of the connection diagram of a pipe body in a return air support type flexible air duct proposed by the present invention;

[0021] Figure 4 This is a schematic structural diagram of a fixed ring in a return air support type flexible air duct proposed by the present invention;

[0022] Figure 5 This is a top view connection schematic diagram of a fixing ring in a return air support type flexible air duct proposed by the present invention;

[0023] Figure 6 This is a structural schematic diagram of a fixed box in a return air support type flexible air duct proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the internal connection of a fixed box in a return air support type flexible air duct proposed by the present invention;

[0025] Figure 8 This is a top view of the internal connection of a fixed box in a return air support type flexible air duct proposed by the present invention;

[0026] Fig. 9 for Figure 8 A magnified view of the structure at B in the middle;

[0027] Fig.10 This is a schematic diagram of the connection between the baffle plate and the rotating plate in a return air support type flexible air duct proposed by the present invention;

[0028] Fig.11This is a schematic diagram of the structure of a rotating plate in a return air support type flexible air duct proposed by the present invention;

[0029] Fig.12 This is a cross-sectional connection diagram of a rotating plate in a return air support type flexible air duct proposed by the present invention;

[0030] Fig.13 for Figure 5 A magnified view of the structure at center.

[0031] In the figure: 1 tube body, 2 bracket, 3 fixing ring, 4 fixing box, 5 opening, 6 opening, 7 bolt, 8 square plate, 9 gear ring, 10 sensor, 11 first gear, 12 rack, 13 baffle, 14 rotating plate, 15 rotating rod, 16 transmission rod, 17 ratchet, 18 second gear, 19 step plate, 20 threaded rod, 21 clamping rod, 22 slide plate, 23 slide rod, 24 connecting plate, 25 first spring, 26 second spring, 27 fixing plate, 28 annular groove, 29 telescopic sleeve, 30 moving plate, 31 third spring, 32 connecting rod. DETAILED DESCRIPTION

[0032] See also Figure 1-Figure 13 A return air support type flexible air duct comprises a pipe body 1 and a bracket 2, wherein the pipe body 1 is fixedly sleeved on the outside of the bracket 2, and a sealing component of the pipe body 1 and the bracket 2 is installed on the outside of the pipe body 1, such as Figure 6 , Figure 7 The sealing assembly includes a fixing ring 3, which is sleeved on the outer side of the tube body 1. The side walls of the fixing ring 3, the tube body 1 and the bracket 2 are all provided with multiple groups of identical openings 6, and bolts 7 are sleeved with the inner threads of the multiple groups of openings 6. The outer side of the fixing ring 3 is rotatably connected with a gear ring 9. The outer side of the tube body 1 is provided with multiple groups of openings 5. The outer side of the fixing ring 3 is fixedly connected with multiple groups of fixing boxes 4. The multiple groups of fixing boxes 4 are rotatably connected with a transmission rod 16. One end of the transmission rod 16 passes through the fixing box 4. The outer side of the transmission rod 16 is fixedly sleeved with a first gear 11. The first gear 11 and the gear ring 9 are meshed. The transmission rod 16 is located in the fixing box 4 and is fixedly sleeved with a second gear 18. The fixing box 4 is slidably connected with a rack 12. The second gear 18 is meshed with the rack 12. The rack 12 passes through the fixing box 4. The rack 12 is fixedly connected with a baffle 13 near one end of the tube body 1. The baffle 13 is opposite to the opening 5, and the outer side of the baffle 13 is fixedly sleeved with a rubber sleeve;

[0033] First, the tube body 1 is sleeved on the outside of the bracket 2, and the tube body 1 and the bracket 2 are glued and fixed by an adhesive (for example, AB glue). This is a prior art and no unnecessary details are given. After the gluing operation is completed, the fixing ring 3 is sleeved on the outside of the tube body 1 until the opening 6 on the outside of the fixing ring 3 and the bracket 2 are relative to the opening 6 on the outside of the tube body 1, and the bolts 7 are screwed into the three openings 6 to install the tube body 1, the bracket 2 and the fixing ring 3 together, and the gear ring 9 is rotated, the gear ring 9 drives the first gear 11 to rotate, the first gear 11 drives the transmission rod 16 to rotate, and the transmission rod 16 drives the second gear 18 to rotate, so that Figure 6 Based on the direction, the rack 12 and the fixed box 4 are connected in an oblique forward and backward sliding manner, and the second gear 18 drives the rack 12 and the baffle 13 to move toward the direction close to the tube body 1 until the baffle 13 and the opening 5 are against each other, thereby completing the closing operation of the opening 5.

[0034] like Figure 8 , Fig. 9 , a connecting assembly of the opening 5 and the baffle 13 is installed in the fixed box 4, the connecting assembly includes a ratchet 17 fixedly connected to the outside of the transmission rod 16, a threaded rod 20 is sleeved in the baffle 13, a clamping rod 21 is fixedly connected in the fixed box 4, one end of the threaded rod 20 is located in the fixed box 4 and is rotatably connected to a slide plate 22, a fixed plate 27 is fixedly connected to the upper side of the rack 12, a second spring 26 is fixedly connected between the fixed plate 27 and the slide plate 22, a slide rod 23 is slidably connected to the side wall of the slide plate 22, one end of the slide rod 23 is fixedly connected to a connecting plate 24, a first spring 25 is fixedly connected between the connecting plate 24 and the slide plate 22, the other end of the slide rod 23 is fixedly connected to a step plate 19, the slide plate 22 and the fixed box 4 are slidably connected, the threaded rod 20 is fixedly connected to the rotating plate 14 at one end away from the fixed box 4, a plurality of rotating grooves are symmetrically opened on the outside of the rotating plate 14, a rotating rod 15 is slidably connected in the rotating groove, and a third spring 31 is fixedly connected between the rotating rod 15 and the rotating groove;

[0035] In the process of the baffle 13 moving toward the direction close to the tube body 1, the threaded rod 20 and the rotating plate 14 move as a whole following the rack 12. Before the baffle 13 and the opening 5 abut against each other, the rotating plate 14 has passed through the opening 5. After the baffle 13 and the opening 5 abut against each other, the gear ring 9 is rotated in the opposite direction of the previous rotation direction. The gear ring 9 drives the transmission rod 16 to rotate through the first gear 11. The transmission rod 16 drives the rack 12 to move away from the tube body 1 through the second gear 18. The transmission rod 16 drives the ratchet 17 to rotate, so that Figure 8, at this time, the ratchet 17 rotates counterclockwise, the ratchet 17 and the step plate 19 abut against each other and drive the step plate 19 to move in the lower right direction along the rack 12, the step plate 19 drives the threaded rod 20 to move in the lower right direction through the slide bar 23 and the slide plate 22, and the threaded rod 20 drives the rotating plate 14 and the rotating rod 15 to move. In this process, since the angular velocity between the ratchet 17 and the second gear 18 is the same, but the ratchet 17 has a larger diameter, the linear velocity of the ratchet 17 is much greater than the linear velocity of the second gear 18, and the speed at which the threaded rod 20 moves to the lower right is much greater than the speed at which the rack 12 moves to the lower right, which will cause the rotating plate 14 to move in the direction close to the baffle 13 until the baffle 13, the tube body 1 and the rotating plate 14 are tightly abutted, thereby completing the connection operation between the tube body 1 and the baffle 13, and During this process, since the clamping rod 21 is always fixedly connected to the fixed box 4, and one end of the clamping rod 21 is located in the threaded groove on the outer side of the threaded rod 20, under the limiting effect of the clamping rod 21, the threaded rod 20 will rotate during the movement of the threaded rod 20, and the threaded rod 20 drives the rotating plate 14 and the rotating rod 15 to rotate. Since the rotating rotating plate 14 and the rotating rod 15 are located inside the tube body 1, during the use of the tube body 1, the rotating plate 14 and the rotating rod 15 can be driven to rotate by repeating the above-mentioned operation, so that the material accumulated inside the tube body 1 can be better discharged from the opening 5, thereby ensuring the normal working effect of the tube body 1, and in this process, the rotating plate 14 and the rotating rod 15 rotate, and when the rotating rod 15 and the tube body 1 are against each other, the shaking amplitude of the tube body 1 will be accelerated, further accelerating the material discharge effect.

[0036] like Fig.10 , Fig.11 , Fig.12 A shaking assembly for controlling the movement of the rotating rod 15 is installed in the baffle 13, and the shaking assembly includes an annular groove 28 opened on the side wall of the baffle 13, and two sets of telescopic sleeves 29 are slidably connected in the annular groove 28. A moving plate 30 is fixedly connected to the side of the two sets of telescopic sleeves 29 away from the baffle 13. The moving plate 30 is slidably connected to the rotating plate 14, and a moving rod is fixedly connected between the moving plate 30 and the rotating rod 15. The annular groove 28 is elliptical;

[0037] Firstly, the telescopic sleeve 29 is formed by sleeve-jointing a plurality of groups of cylinders of different diameters. Secondly, since the annular groove 28 is elliptical, and the telescopic sleeve 29 abuts against the side walls of the annular groove 28 and is slidably connected along the side walls of the annular groove 28 and the annular groove 28, during the rotation of the rotating plate 14 and the rotating rod 15, under the influence of the elliptical annular groove 28, since the baffle 13 is in a fixed state, the rotating rotating plate 14 drives the moving plate 30 to rotate, and the moving plate 30 drives the telescopic sleeve 29 to rotate. Since the telescopic sleeve 29 and the annular groove 28 are slidably connected, during the rotation of the rotating plate 14, the rotating rod 15 will move back and forth relative to the rotating plate 14, so that the rotating rod 15 moves relative to the rotating plate 14 in a direction away from or close to each other. The rotating rod 15 that moves back and forth can not only clean the substances inside the tube body 1, but also the moving rotating rod 15 always abuts against the inner wall of the tube body 1, and the cleaning effect is good.

[0038] like Fig.13 A square plate 8 is fixedly connected to the outer side of the bolt 7, and the square plate 8 is located on the upper side of the gear ring 9. Multiple sets of sensors 10 are fixedly installed on the outer side of the gear ring 9 in the circumferential direction, and the multiple sets of sensors 10 are located between the fixing ring 3 and the square plate 8;

[0039] First, the sensor 10 is a touch sensor 10. When an object abuts against the sensor 10, the sensor 10 can send out a corresponding electrical signal. After the baffle 13 completes the corresponding work, the square plate 8 is rotated again until the square plate 8 and the gear ring 9 abut against each other. The gear ring 9 is clamped by the square plate 8, and the sensor 10 and the square plate 8 abut against each other. The sensor 10 sends out a corresponding electrical signal. During the use of the tube body 1, if the sensor 10 does not send out an electrical signal, it means that there is looseness between the square plate 8 and the rack 12, and corresponding adjustments and maintenance operations are required, so as to complete the self-inspection operation of the entire tube body 1.

[0040] In the present invention, the tube body 1 is sleeved on the outside of the bracket 2, and the tube body 1 and the bracket 2 are glued and fixed by an adhesive (for example, AB glue). This is a prior art and no redundant description is given. After the gluing operation is completed, the fixing ring 3 is sleeved on the outside of the tube body 1 until the opening 6 on the outside of the fixing ring 3 and the bracket 2 are relative to the opening 6 on the outside of the tube body 1, and the bolts 7 are screwed into the three openings 6 to install the tube body 1, the bracket 2 and the fixing ring 3 together, and the gear ring 9 is rotated, the gear ring 9 drives the first gear 11 to rotate, the first gear 11 drives the transmission rod 16 to rotate, and the transmission rod 16 drives the second gear 18 to rotate, so that Figure 6The rack 12 and the fixed box 4 are connected in an oblique forward and backward sliding manner. The second gear 18 drives the rack 12 and the baffle 13 to move in the direction close to the tube body 1. In the process of the baffle 13 moving in the direction close to the tube body 1, the threaded rod 20 and the rotating plate 14 move along with the rack 12 as a whole. Before the baffle 13 and the opening 5 abut against each other, the rotating plate 14 has passed through the opening 5. After the baffle 13 and the opening 5 abut against each other, the gear ring 9 is rotated in the opposite direction of the previous rotation direction. The gear ring 9 drives the transmission rod 16 to rotate through the first gear 11. The transmission rod 16 drives the rack 12 to move in the direction away from the tube body 1 through the second gear 18. The transmission rod 16 drives the ratchet 17 to rotate, so as to Figure 8 , at this time, the ratchet 17 rotates counterclockwise, the ratchet 17 and the step plate 19 abut against each other and drive the step plate 19 to move in the lower right direction along the rack 12, the step plate 19 drives the threaded rod 20 to move in the lower right direction through the slide bar 23 and the slide plate 22, and the threaded rod 20 drives the rotating plate 14 and the rotating rod 15 to move. In this process, since the angular velocity between the ratchet 17 and the second gear 18 is the same, but the ratchet 17 has a larger diameter, the linear velocity of the ratchet 17 is much greater than the linear velocity of the second gear 18, so the speed at which the threaded rod 20 moves to the lower right is much greater than the speed at which the rack 12 moves to the lower right, which will cause the rotating plate 14 to move in the direction close to the baffle 13 until the baffle 13, the tube body 1 and the rotating plate 14 are tightly abutted, thereby completing the rotation of the tube body. 1 and the baffle 13, and in this process, since the clamping rod 21 is always fixedly connected to the fixed box 4, the threaded rod 20 will rotate during the movement of the threaded rod 20, and the threaded rod 20 drives the rotating plate 14 and the rotating rod 15 to rotate. Since the rotating rotating plate 14 and the rotating rod 15 are located inside the tube body 1, during the use of the tube body 1, the rotating plate 14 and the rotating rod 15 can be driven to rotate by repeating the above operation, so that the material accumulated inside the tube body 1 can be better discharged from the opening 5, thereby ensuring the normal working effect of the tube body 1, and in this process, the rotating plate 14 and the rotating rod 15 rotate, and when the rotating rod 15 and the tube body 1 are against each other, the shaking amplitude of the tube body 1 will be accelerated, further accelerating the material discharge effect;

[0041] During the rotation of the rotating plate 14 and the rotating rod 15, under the influence of the elliptical annular groove 28, since the baffle 13 is in a fixed state, the rotating rotating plate 14 drives the moving plate 30 to rotate, and the moving plate 30 drives the telescopic sleeve 29 to rotate. Since the telescopic sleeve 29 and the annular groove 28 are in sliding connection, during the rotation of the rotating plate 14, the rotating rod 15 will move back and forth relative to the rotating plate 14, so that the rotating rod 15 moves away from or close to the rotating plate 14. The rotating rod 15 that moves back and forth can not only clean the substances inside the tube body 1, but also the moving rotating rod 15 always abuts against the inner wall of the tube body 1, and the cleaning effect is good.

[0042] After the baffle 13 completes the corresponding work, the square plate 8 is rotated again until the square plate 8 and the gear ring 9 are butted against each other, and the gear ring 9 is clamped by the square plate 8. At the same time, the sensor 10 and the square plate 8 are butted against each other, and the sensor 10 sends out a corresponding electrical signal. During the use of the tube body 1, if the sensor 10 does not send out an electrical signal, it means that there is looseness between the square plate 8 and the rack 12, and corresponding adjustments and maintenance operations are required, so as to complete the self-inspection operation of the entire tube body 1.

Claims

1. A return air support type flexible air duct, comprising a tube body (1) and a bracket (2), characterized in that: The tube body (1) is fixedly sleeved on the outer side of the bracket (2); a sealing assembly of the tube body (1) and the bracket (2) is installed on the outer side of the tube body (1); the sealing assembly comprises a fixing ring (3); the fixing ring (3) is sleeved on the outer side of the tube body (1); the side walls of the fixing ring (3), the tube body (1) and the bracket (2) are all provided with a plurality of groups of identical openings (6); the plurality of groups of openings (6) are internally threadedly sleeved with bolts (7); the outer side of the fixing ring (3) is rotatably connected to a gear ring (9); the outer side of the tube body (1) is provided with a plurality of groups of openings (5); the outer side of the fixing ring (3) is fixedly connected to a plurality of groups of fixing boxes (4); the plurality of groups of fixing boxes (4) are internally rotatably connected to the fixing boxes (4); A transmission rod (16) is provided, one end of the transmission rod (16) passes through a fixed box (4), a first gear (11) is fixedly sleeved on the outer side of the transmission rod (16), the first gear (11) and a gear ring (9) are meshed, the transmission rod (16) is located in the fixed box (4) and is fixedly sleeved with a second gear (18), a rack (12) is slidably connected in the fixed box (4), the second gear (18) and the rack (12) are meshed, the rack (12) passes through the fixed box (4), a baffle (13) is fixedly connected to one end of the rack (12) close to the tube body (1), the baffle (13) is opposite to the opening (5), and the fixed box (4) is provided with a plurality of gears (18) and a plurality of gears (18) are provided in the fixed box (4). A connecting assembly is provided with an opening (5) and a baffle (13), the connecting assembly comprising a ratchet (17) fixedly connected to the outside of a transmission rod (16), a threaded rod (20) is sleeved in the baffle (13), a clamping rod (21) is fixedly connected in the fixed box (4), one end of the threaded rod (20) located in the fixed box (4) is rotatably connected to a slide plate (22), a fixing plate (27) is fixedly connected to the upper side of the rack (12), a second spring (26) is fixedly connected between the fixing plate (27) and the slide plate (22), a sliding rod (23) is slidably connected to the side wall of the slide plate (22), and one end of the sliding rod (23) is fixedly connected to the connecting plate (2 4), a first spring (25) is fixedly connected between the connecting plate (24) and the slide plate (22), the other end of the slide rod (23) is fixedly connected to a step plate (19), the slide plate (22) and the fixed box (4) are slidably connected, the end of the threaded rod (20) away from the fixed box (4) is fixedly connected to a rotating plate (14), a plurality of groups of rotating grooves are symmetrically opened on the outer side of the rotating plate (14), a rotating rod (15) is slidably connected in the rotating groove, a third spring (31) is fixedly connected between the rotating rod (15) and the rotating groove, the ratchet (17) is in abutment with the step plate (19), and the diameter of the ratchet (17) is larger than the diameter of the second gear (11).

2. The return air support type flexible air duct according to claim 1, characterized in that: A shaking assembly for controlling the movement of the rotating rod (15) is installed in the baffle (13), and the shaking assembly includes an annular groove (28) formed in the side wall of the baffle (13). Two groups of telescopic sleeves (29) are slidably connected in the annular groove (28). A moving plate (30) is fixedly connected to the side of the two groups of telescopic sleeves (29) away from the baffle (13). The moving plate (30) is slidably connected to the rotating plate (14), and a moving rod is fixedly connected between the moving plate (30) and the rotating rod (15).

3. The return air support type flexible air duct according to claim 2, characterized in that: The annular groove (28) is elliptical.

4. The return air support type flexible air duct according to claim 1, characterized in that: A square plate (8) is fixedly connected to the outer side of the bolt (7), and the square plate (8) is located on the upper side of the gear ring (9).

5. The return air support type flexible air duct according to claim 1, characterized in that: A plurality of groups of sensors (10) are fixedly mounted on the outer circumference of the gear ring (9), and the plurality of groups of sensors (10) are located between the fixed ring (3) and the square plate (8).

6. The return air support type flexible air duct according to claim 1, characterized in that: A rubber sleeve is fixedly sleeved on the outer side of the baffle (13).

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