Gas film seal air lock

Abstract

The application discloses a kind of gas film sealing air lock, including air lock, driving mechanism, dynamic gas film sealing mechanism and air pressure control system, the air lock includes shell and rotation setting in the inner chamber of the shell's rotating shaft, the rotating shaft is fixedly connected with multiple equidistributed blades, the blade extends along the axial direction of the rotating shaft and is arranged;Dynamic gas film sealing mechanism includes sealing pipeline and air inlet structure, the sealing pipeline is connected at the position of the blade away from the rotating shaft, the sealing pipeline extends along the extension direction of the blade and is arranged, multiple airflow nozzles are arranged on the sealing pipeline along the extension direction, the airflow nozzle is arranged towards the gap between the blade and shell, the air inlet end of the sealing pipeline is communicated with the air inlet structure.The gas film sealing air lock of the application greatly reduces the air leakage of air lock, reduces the jamming condition of air lock, and has better reliability.

Description

Technical Field

[0001] This invention relates to the field of airlock sealing technology, and in particular to an air-film sealing airlock sealing machine. Background Technology

[0002] Driven by the "dual-carbon" strategic goal, biomass co-firing technology has become a key development direction for coal-fired power plants. Among biomass co-firing technologies, direct biomass co-firing technology has been widely applied in coal-fired units both domestically and internationally, attracting significant attention. In direct biomass co-firing technology, the positive pressure dense phase conveying system is the mainstream method for conveying biomass powder. In this system, the airlock, as the core equipment connecting the atmospheric pressure storage silo and the positive pressure pipeline, undertakes the dual functions of dynamic sealing and continuous quantitative feeding. Its operational reliability directly determines the stability of the co-firing system and the accuracy of the blending ratio adjustment.

[0003] Due to their high fiber content, irregular shape, and low bulk density, biomass pellets are prone to embedding in the gap between the impeller and the casing under high pressure, creating mechanical obstruction. Positive pressure dense phase conveying systems frequently experience airflow leakage from the gap between the impeller and the casing during operation. This leakage not only hinders the falling of biomass fiber powder and causes metering inaccuracies, but also leads to backflow, disrupting the slightly negative pressure environment of the storage silo, resulting in dust escape and increased energy consumption. To reduce air leakage, the gap between the impeller and the casing needs to be reduced. However, excessively reducing the gap, due to the irregular shape and high fiber content of biomass pellets, easily leads to particle accumulation at the gap, causing impeller jamming or even seizing.

[0004] In summary, how to provide a shut-off fan that combines low air leakage rate with minimal jamming has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an air-film sealed airlock, which greatly reduces the air leakage of the airlock, reduces the occurrence of jamming in the airlock, and improves reliability.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A film-sealed airlock includes an airlock body, a drive mechanism, a dynamic film-sealing mechanism, and a wind pressure control system. The airlock body includes a housing and a rotating shaft rotatably disposed within the inner cavity of the housing. Multiple evenly distributed blades are fixedly connected to the rotating shaft, and the blades extend axially along the rotating shaft. The dynamic film-sealing mechanism includes a sealing pipe and an air inlet structure. The sealing pipe is connected to the blades at a position away from the rotating shaft and extends along the extension direction of the blades. Multiple airflow nozzles are arranged along the extension direction of the sealing pipe, and the airflow nozzles are positioned towards the gap between the blades and the housing. The air inlet end of the sealing pipe communicates with the air inlet structure.

[0008] Optionally, the sealing pipe is located on the windward side when the blade rotates;

[0009] The angle between the airflow nozzle and the surface of the blade where the sealing pipeline is located is A, where 0°≤A<90°.

[0010] Optionally, the outer casing is provided with end caps at both ends, and the air intake structure includes an air chamber housing. The air chamber housing is arranged around the rotating shaft and is fixedly connected to the rotating shaft and the blade. The air chamber housing is a housing structure with an opening at only one end. The opening end of the air chamber housing is located close to the end cap and communicates with the air intake hole on the end cap.

[0011] The open end of the air chamber housing is slidably sealed to the end cap, and the air inlet of the sealing pipeline is connected to the inner cavity of the air chamber housing.

[0012] Optionally, the air intake structure further includes an air distribution ring, which is disposed in the inner cavity of the air chamber housing and is detachably connected to the end cap;

[0013] The inner cavity of the outer shell includes an idling return side and a material conveying side. The air distribution ring is set on the idling return side of the air shut-off fan to form an air storage cavity. The curvature of the air distribution ring corresponds to the curvature of the air cavity shell.

[0014] Optionally, the valve ring is connected to the adjustment through hole on the end cap via a connector. The adjustment through hole is configured as an oblong hole, and at least two oblong holes are provided.

[0015] Optionally, the air chamber housing is an arc-shaped housing, the air distribution ring is an arc plate, the central axis of the air distribution ring coincides with or is offset from the central axis of the air chamber housing, and the arc length of the arc plate accounts for more than 1 / 2 of the circumference.

[0016] Optionally, a sealing ring groove is provided on the end face of the end cap near the air chamber housing, and the open end of the air chamber housing is placed in the sealing ring groove.

[0017] Optionally, at least two air inlets are provided, and the plurality of air inlets are evenly distributed around the center position of the end cap.

[0018] Optionally, the wind pressure control system includes an air intake pipe and an air source pipe. One end of the air intake pipe is connected to the air inlet, and the other end is connected to the air source pipe. The air source pipe is connected to the air storage device. A pressure detector is installed on the air intake pipe, and the pressure detector is communicatively connected to the controller.

[0019] A control valve is installed on the gas source pipe, and the control valve is communicatively connected to the controller.

[0020] The intake pipe includes at least two pipes arranged in parallel.

[0021] Optionally, the drive mechanism includes a motor, and the power output end of the motor is connected to the rotating shaft via a transmission mechanism.

[0022] Optionally, the valve ring is provided with a first sensor and a second sensor. The first sensor includes two sensors, which are respectively disposed at both ends of the valve ring, and the second sensor is disposed on the surface of the valve ring near the gas storage cavity.

[0023] The first sensor is a pressure sensor, and the second sensor is an acceleration sensor.

[0024] Optionally, a third sensor is provided at the end of the blade near the outer casing, the third sensor being used to monitor the temperature and pressure of the air film between the end of the blade and the inner surface of the outer casing.

[0025] Optionally, the gas distribution ring is made of a piezoelectric material.

[0026] As can be seen from the above technical solution, the air-film sealed airlock provided by the present invention, by setting a sealing pipe on the side of the blade away from the rotating shaft, and setting multiple airflow nozzles on the sealing pipe, blows sealing air towards the gap between the blade and the outer shell. The sealing air sweeps away the material in the gap between the blade and the outer shell, effectively preventing the airlock from jamming. At the same time, the airflow sprayed from the airflow nozzle blows towards the gap between the blade and the outer shell, forming an air curtain seal at the gap position. Therefore, it is not necessary to excessively reduce the distance between the blade and the outer shell to reduce the air leakage, further reducing the probability of the airlock jamming. The air-film sealed airlock of the present invention has the advantages of low air leakage rate and low jamming rate, and has better reliability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the air-film sealed airlock provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the rotating hopper provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the connection between the wind pressure control system and the end cap provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a gas distribution ring disposed inside the gas cavity housing according to an embodiment of the present invention;

[0032] Figure 5 for Figure 4 A partially enlarged structural diagram of part I in the diagram;

[0033] Figure 6 This is a schematic diagram of the connection structure between the sealing pipeline and the air chamber shell provided in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection structure between the air chamber shell, the sealing pipeline, and the blades provided in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the end cap structure provided in an embodiment of the present invention;

[0036] Figure 9 for Figure 8 A cross-sectional view of the end cap along the BB position;

[0037] Figure 10 A schematic diagram of the arrangement structure of the first sensor and the second sensor provided in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the arrangement structure of the third sensor provided in an embodiment of the present invention.

[0039] in:

[0040] 1. Feed inlet; 2. Outer shell; 3. End cap; 301. Connecting hole; 302. Sealing ring groove; 303. Adjustment through hole; 304. Air inlet; 4. Connecting bolt; 5. Support rib; 6. Discharge port; 7. Blade; 8. Rotary hopper; 9. Shaft; 10. Bearing; 11. Support frame; 12. Drive chain; 13. Motor; 14. Reducer; 15. Air chamber shell; 1501. Exhaust cavity; 1502. Air storage type. 1503, Exhaust port, 16, Gas distribution ring, 17, Sealing pipe, 18, Airflow nozzle, 19, Inlet pipe, 20, Connection port, 21, Connection collar, 22, T-junction, 23, Pressure detector, 24, Control valve, 25, Gas storage device, 26, Second signal line, 27, Controller, 28, First signal line, 29, Gas source pipe, 30, First sensor, 31, Second sensor, 32, Third sensor. Detailed Implementation

[0041] This invention discloses an air-film sealed airlock, which greatly reduces air leakage, reduces jamming, and improves reliability.

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Reference Figures 1 to 11 The air-film sealing airlock of the present invention includes an airlock body, a drive mechanism, a dynamic air-film sealing mechanism, and a wind pressure control system. The airlock body includes a housing 2 and a rotating shaft 9 rotatably disposed within the inner cavity of the housing 2. Multiple evenly distributed blades 7 are fixedly connected to the rotating shaft 9, extending axially along the rotating shaft 9 to divide the inner cavity of the housing 2 into multiple storage bins. The dynamic air-film sealing mechanism includes a sealing pipe 17 and an air inlet structure. The sealing pipe 17 is connected to a position of the blades 7 away from the rotating shaft 9, extending along the extension direction of the blades 7. Multiple airflow nozzles 18 are arranged along the extension direction of the sealing pipe 17, facing the gap between the blades 7 and the housing 2 to blow sealing air into the gap. The air inlet end of the sealing pipe 17 is connected to the air inlet structure.

[0044] Each blade 7 is equipped with at least one sealed conduit 17, with the blade 7 extending along the axial direction of the rotating shaft 9. The sealed conduit 17 is arranged parallel to the length direction of the blade 7. The sealed conduit 17 can be arranged parallel to the rotating shaft 9. Two adjacent blades 7 and the inner wall of the outer casing 2 form a storage bin. The blades 7 are welded to the rotating shaft 9, forming a rotating storage bin 8 between the blades 7.

[0045] The air-film sealed airlock of the present invention features a sealing pipe 17 on the side of the blade 7 away from the rotating shaft 9. Multiple airflow nozzles 18 are installed on the sealing pipe 17, and the nozzles blow sealing air towards the gap between the blade 7 and the outer casing 2. This sealing air clears material from the gap, effectively preventing the airlock from jamming. Simultaneously, the airflow from the nozzles 18 forms an air curtain seal at the gap, reducing air leakage without excessively reducing the distance between the blade 7 and the outer casing 2, further lowering the probability of jamming. The air-film sealed airlock of the present invention combines the advantages of low leakage rate and low jamming rate, resulting in better reliability.

[0046] The inner cavity of the outer casing 2 includes an idle return side and a material conveying side. The sealed pipe 17 is located on the windward side when the blade 7 rotates, such as... Figure 4 As shown, the arrow indicates the direction of rotation of blade 7 around axis 9. The windward side of blade 7 during rotation is the non-material-carrying surface of blade 7 on the conveying side. To ensure that the air ejected from the airflow nozzle 18 effectively prevents air leakage and cleans the gap between the edge of blade 7 away from axis 9 and the outer casing 2, the angle between the airflow nozzle 18 and the surface of the sealing pipe 17 on blade 7 is A, as shown. Figure 5 As shown, the included angle A ranges from 0° to A < 90°. The sealing pipe 17 can be welded onto the blade 7.

[0047] To achieve a seal at the ends of the outer casing 2 of the airlock, sealing end caps 3 are provided at both ends of the outer casing 2. The air intake structure includes an air chamber housing 15, which is arranged around the rotating shaft 9 and fixedly connected to the rotating shaft 9 and the blades 7. The air chamber housing 15 is a housing structure with an opening at only one end. The open end of the air chamber housing 15 is located near the end cap 3 and communicates with the air inlet 304 on the end cap 3. The air inlet 304 is used to supply sealing gas to the inner cavity of the air chamber housing 15. The open end of the air chamber housing 15 is slidably sealed with the end cap 3 to reduce the probability of air leakage. The air inlet of the sealing pipe 17 communicates with the inner cavity of the air chamber housing 15, and the gas in the inner cavity of the air chamber housing 15 flows to the airflow nozzle 18 through the sealing pipe 17.

[0048] Furthermore, the air intake structure also includes an air distribution ring 16, which is disposed within the inner cavity of the air chamber housing 15. The air distribution ring 16 is detachably connected to the end cap 3 and is positioned close to the inner wall of the air chamber housing 15. The shut-off fan includes an idle return side and a material conveying side. The material conveying side is used to convey biomass powder, while the idle return side does not convey material. The air distribution ring 16, disposed on the idle return side of the shut-off fan, forms an air storage cavity 1502, and the inner cavity side of the air chamber housing 15 without the air distribution ring 16 forms an exhaust cavity 1501, as shown below. Figure 6 As shown, the separation between the gas storage cavity 1502 and the exhaust cavity 1501 is roughly along the dotted line. The curvature of the air distribution ring 16 corresponds to the curvature of the gas chamber housing 15. The inner cavity of the gas chamber housing 15 is divided into the gas storage cavity 1502 and the exhaust cavity 1501 by the air distribution ring 16. The gas chamber housing 15 is provided with an exhaust port 1503, as shown... Figure 7 As shown, the exhaust port 1503 is connected to the air inlet of the sealing pipe 17, and the exhaust port 1503 penetrates the shell wall of the air chamber housing 15. The air inlet of each sealing pipe 17 is connected to an exhaust port 1503.

[0049] The air distribution ring 16 is fixedly installed in the inner cavity of the air chamber housing 15, and its position remains unchanged relative to the outer shell 2. This ensures that the air distribution ring 16 is always located on the idling return side of the air shut-off fan, preventing airflow from flowing to the idling return side and causing gas waste. More airflow flows to the exhaust cavity 1501, which corresponds to the material conveying side of the air shut-off fan, thereby allowing more gas to flow to the material conveying side and forming a better airflow seal for the gap between the blade 7 and the outer shell 2.

[0050] In one specific embodiment, the valve ring 16 is connected to the adjustment through hole 303 on the end cap 3 via a connector. To facilitate adjustment of the gap between the valve ring 16 and the outer casing 2, the adjustment through hole 303 is configured as an oblong hole, and at least two oblong holes are provided. Figure 8 As shown, there are two adjusting through holes 303, both horizontally positioned. To prevent air leakage at the connection, after the connector is attached to the adjusting through hole 303, the gap in the adjusting through hole 303 is sealed by a sealing structure. This sealing structure can be a sealing ring or other commonly used sealing structures; no limitation is made here. Specifically, the connector is an adjusting bolt. In other embodiments, the adjusting through hole 303 can be a common circular through hole. In this embodiment, the position of the valve ring 16 cannot be adjusted, but the sealing performance at the connector connection point is better.

[0051] Specifically, the air chamber housing 15 is an arc-shaped housing, and the air distribution ring 16 is an arc-shaped plate. The central axis of the air distribution ring 16 coincides with or is offset from the central axis of the air chamber housing 15. The arc length of the arc plate accounts for more than half of the circumference, specifically 7 / 12 of the circumference.

[0052] To improve the sealing performance between the open end of the air chamber housing 15 and the end cap 3, a sealing ring groove 302 is provided on the end face of the end cap 3 near the air chamber housing 15, such as... Figure 8 and Figure 9 The open end of the air chamber housing 15 is placed within the sealing ring groove 302. The air chamber housing 15 is an arc-shaped housing, which facilitates the insertion of the open end of the air chamber housing 15 into the sealing ring groove 302 without affecting the rotation of the air chamber housing 15. The end cover 3 is also provided with a connecting hole 301, which facilitates the connection between the end cover 3 and the outer shell 2. The end cover 3 and the outer shell 2 are connected by connecting bolts 4. Both ends of the rotating shaft 9 pass through the end cover 3, and both ends of the rotating shaft 9 are rotatably supported by bearings 10, thereby facilitating the rotation of the rotating shaft 9. The end cover 3 is provided with a support rib 5, one end of which is fixedly connected to the end cover 3, and the other end is used to support the bearing 10.

[0053] The air pressure control system includes an intake pipe 19 and an air source pipe 29. One end of the intake pipe 19 is connected to the connection port 20 on the intake hole 304 via a connecting collar 21, and the other end is connected to the air source pipe 29. The end of the air source pipe 29 away from the intake pipe 19 is connected to the air storage device 25. To facilitate the detection of the intake pressure, a pressure detector 23 is installed on the intake pipe 19. The pressure detector 23 is communicatively connected to the controller 27 via a first signal line 28. To achieve automatic adjustment of the intake, a control valve 24 is installed on the air source pipe 29. The control valve 24 is communicatively connected to the controller 27 via a second signal line 26. The control valve 24 can be a bidirectional flow guide valve. The second signal line 26 is a signal output line, and the first signal line 28 is a signal input line. To improve the uniformity of the intake, the intake pipe 19 includes at least two intake pipes connected in parallel. Multiple intake pipes 19 are connected in parallel, and the intake ends of multiple intake pipes 19 are all connected to the air source pipe 29. In one embodiment, as shown... Figure 3 As shown, there are two air inlet pipes 19, which are connected to the air source pipe 29 via a tee 22. The air storage device 25 can be an air tank or other device. The pressure detector 23 generates a pressure signal of the sealing air in the air inlet pipe 19. The pressure signal is transmitted to the controller 27 via the first signal line 28. The controller 27 judges the pressure signal and generates a judgment signal. The judgment signal is transmitted to the control valve 24 via the second signal line 26. After receiving the judgment signal, the control valve 24 automatically adjusts its opening to realize the automatic control of the dynamic air film sealing air.

[0054] To facilitate the rotation of the rotating shaft 9, the drive mechanism includes a motor 13. The power output end of the motor 13 is connected to a reducer 14, and the power output end of the reducer 14 is connected to the rotating shaft 9 via a transmission mechanism. The reducer 14 is fixed to the housing 2 by a support frame 11. In one embodiment, the transmission mechanism includes a transmission chain 12 and a sprocket, such as... Figure 1As shown, the sprocket includes a driving sprocket and a driven sprocket. The driving sprocket is connected to the power output end of the reducer 14, and the driven sprocket is connected to the shaft end of the rotating shaft 9. The transmission chain 12 is sleeved on the driving sprocket and the driven sprocket.

[0055] The air chamber housing 15 is integrally cast and welded to the blades 7 and the rotating shaft 9. When the rotating shaft 9 rotates, the blades 7 rotate with the rotating shaft 9, thus causing the air chamber housing 15 to rotate with the blades 7. The connection port 20 is made of a Φ30mm-50mm round steel pipe and is welded to the air inlet 304. The sealing pipe 17 is made of a Φ10mm-25mm round steel pipe.

[0056] To ensure uniform air intake, at least two air intake holes 304 are provided, and multiple air intake holes 304 are evenly distributed around the center of the end cover 3. Each air intake hole 304 is connected to an air source. (Refer to...) Figure 8 As shown, there are two air inlets 304.

[0057] In the positive pressure conveying system, material enters the rotating hopper 8 through the feed inlet 1 and rotates towards the discharge outlet 6 as the blades 7 rotate. During rotation, material enters the gap between the blades 7 and the outer shell 2, which can easily cause the airlock to jam. High-pressure air in the air storage device 25 enters the inner cavity of the air chamber housing 15 through the air source pipe 29, control valve 24, tee 22, and air inlet 304. The air distribution ring 16 in the air chamber housing 15 distributes a large amount of sealing air to the exhaust cavity 1501. The sealing air enters the sealing pipe 17 from the exhaust cavity 1501 and enters the airlock through the airflow nozzle 18 on the sealing pipe 17, completing the seal. The sealing air is sprayed out from the airflow nozzle 18 to blow away the material in the gap between the blades 7 and the outer shell 2, effectively preventing the airlock from jamming. The air storage device 25 contains high-pressure air with a pressure of 0.3 MPa to 0.6 MPa.

[0058] To facilitate monitoring of gas pressure and airflow direction within the cavity of the gas chamber housing 15, a first sensor 30 is installed on the gas distribution ring 16, such as... Figure 10 As shown, the first sensor 30 includes two sensors, which are respectively disposed at both ends of the valve train 16. The first sensor 30 is a pressure sensor. In order to facilitate the monitoring of the vibration characteristics of the valve train 16 itself and ensure the stability of its dynamic response, a second sensor 31 is disposed on the valve train 16. The second sensor 31 is an acceleration sensor. Specifically, the second sensor 31 is disposed on the surface of the valve train 16 near the air storage cavity 1502.

[0059] To monitor the pressure and temperature field of the air film between the tip of the blade 7 and the inner surface of the outer shell 2, a third sensor 32 is installed at the tip of the blade 7 near the inner surface of the outer shell 2, such as... Figure 11As shown, the third sensor 32 is an integrated pressure and temperature sensor, which facilitates monitoring the performance of the sealed gas membrane.

[0060] All of the above sensors are connected to the controller, and the connection and control methods are existing technologies.

[0061] The gas distribution ring 16 is made of piezoelectric material. It is fabricated from a material exhibiting piezoelectric effect, allowing it to undergo precise micron-level deformation when an external electric field is applied. Utilizing the bidirectional effect of the piezoelectric material, some piezoelectric units act as miniature sensors, detecting air film pressure or structural deformation and generating electrical signals; the other piezoelectric units act as actuators, actively deforming according to controller commands to adjust the shape of the gas distribution ring 16 in real time.

[0062] This invention provides an air-film sealed airlock, which achieves both low air leakage rate and high reliability, and reduces the probability of the airlock jamming.

[0063] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this solution.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A film-sealed airlock, characterized in that, The device includes a shut-off fan body, a drive mechanism, a dynamic air film sealing mechanism, and a wind pressure control system. The shut-off fan body includes a housing and a rotating shaft rotatably disposed within the inner cavity of the housing. Multiple evenly distributed blades are fixedly connected to the rotating shaft, and the blades extend axially along the rotating shaft. The dynamic air film sealing mechanism includes a sealing pipe and an air intake structure. The sealing pipe is connected to the blades at a position away from the rotating shaft and extends along the extension direction of the blades. Multiple airflow nozzles are arranged along the extension direction of the sealing pipe, and the airflow nozzles are positioned towards the gap between the blades and the housing. The air intake end of the sealing pipe is connected to the air intake structure.

2. The air-film sealed airlock according to claim 1, characterized in that, The sealed pipeline is located on the windward side when the blade rotates; The angle between the airflow nozzle and the surface of the blade where the sealing pipeline is located is A, where 0°≤A<90°.

3. The air-film sealed airlock according to claim 1, characterized in that, The outer shell is provided with end caps at both ends. The air intake structure includes an air chamber housing, which is arranged around the rotating shaft. The air chamber housing is fixedly connected to the rotating shaft and the blade. The air chamber housing is a housing structure with an opening at only one end. The opening end of the air chamber housing is located close to the end cap and communicates with the air intake hole on the end cap. The open end of the air chamber housing is slidably sealed to the end cap, and the air inlet of the sealing pipeline is connected to the inner cavity of the air chamber housing.

4. The air-film sealed airlock according to claim 3, characterized in that, The air intake structure also includes an air distribution ring, which is disposed in the inner cavity of the air chamber housing and is detachably connected to the end cap; The inner cavity of the outer shell includes an idling return side and a material conveying side. The air distribution ring is set on the idling return side of the air shut-off fan to form an air storage cavity. The curvature of the air distribution ring corresponds to the curvature of the air cavity shell.

5. The air-film sealed airlock according to claim 4, characterized in that, The valve ring is connected to the adjustment through hole on the end cap via a connector. The adjustment through hole is a waist-shaped hole, and at least two waist-shaped holes are provided.

6. The air-film sealed airlock according to claim 4, characterized in that, The air chamber housing is an arc-shaped housing, and the air distribution ring is an arc plate. The central axis of the air distribution ring coincides with or is offset from the central axis of the air chamber housing. The arc length of the arc plate accounts for more than 1 / 2 of the circumference.

7. The air-film sealed airlock according to claim 6, characterized in that, A sealing ring groove is provided on the end face of the end cap near the air chamber housing, and the open end of the air chamber housing is placed in the sealing ring groove.

8. The air-film sealed airlock according to claim 3, characterized in that, The air inlet is provided with at least two, and the multiple air inlets are evenly distributed around the center position of the end cap.

9. The air-film sealed airlock according to any one of claims 3-8, characterized in that, The wind pressure control system includes an air intake pipe and an air source pipe. One end of the air intake pipe is connected to the air inlet, and the other end is connected to the air source pipe. The air source pipe is connected to the air storage device. A pressure detector is installed on the air intake pipe, and the pressure detector is communicatively connected to the controller. A control valve is installed on the gas source pipe, and the control valve is communicatively connected to the controller. The intake pipe includes at least two pipes arranged in parallel.

10. The air-film sealed airlock according to claim 1, characterized in that, The drive mechanism includes a motor, and the power output end of the motor is connected to the rotating shaft via a transmission mechanism.

11. The air-film sealed airlock according to claim 4, characterized in that, The air distribution ring is provided with a first sensor and a second sensor. The first sensor includes two sensors, which are respectively disposed at both ends of the air distribution ring. The second sensor is disposed on the surface of the air distribution ring near the air storage cavity. The first sensor is a pressure sensor, and the second sensor is an acceleration sensor.

12. The air-film sealed airlock according to claim 1, characterized in that, A third sensor is provided at the end of the blade near the outer shell. The third sensor is used to monitor the temperature and pressure of the air film between the end of the blade and the inner surface of the outer shell.

13. The air-film sealed airlock according to claim 4, characterized in that, The gas distribution ring is made of piezoelectric material.

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