A fully sealed adjustable throttling device

Abstract

The present invention provides a fully sealed adjustable flow device, including a connecting short pipe for butt welding connection with a pipeline; an adjusting blade for adjusting the flow area; a connecting rod, which is transmission-connected with each adjusting blade and is used to synchronously change the rotation angle of each adjusting blade to change the flow area; a fixing ring, which is used to install the adjusting blade; a rotating ring, which is connected to the other end of the connecting rod and is used to change the rotation angle of the adjusting blade by rotating the rotating ring; a sealing shell, which is welded to the connecting short pipe to achieve a fully sealed effect; and an adjusting ring, which controls the rotation angle of the rotating ring by strong magnetism. The fully sealed adjustable flow device of the present invention can adjust the flow rate by adjusting the rotation angle of the adjusting blade, thereby changing the flow area. The adjustment is convenient and stable, and the risk of leakage of flammable, explosive or toxic gases in the pipeline can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of flow regulation, and particularly relates to a fully sealed adjustable throttling device. Background Art

[0002] In order to ensure the safety of equipment and personnel, the gaseous natural gas transmission pipeline of the marine LNG supply system needs to adopt a double-pipe design when passing through a safe area. There is a certain risk of leakage in the inner pipe. Therefore, mechanical ventilation is designed in the space between the inner and outer pipes to ensure a certain number of air change times to prevent the accumulation of dangerous gases. In order to adjust the flow rate of the mechanical ventilation, a certain adjustable throttling device needs to be installed.

[0003] The traditional adjustable orifice plate needs to be installed in the form of flange connection. Due to the vibration and deformation generated during the operation of the ship, there may be a risk of leakage at the flange connection surface, posing a certain safety hazard.

[0004] When using the traditional valve for regulation, although butt welding connection can be adopted, the flow rate regulation of the valve is unstable and it cannot be applied to the pipeline with an inner pipe. In addition, there is still a risk of leakage at the valve stem seal of the valve.

[0005] Therefore, how to stably adjust the flow rate and avoid the risk of leakage is the difficulty in the flow rate regulation of pipelines transporting flammable, explosive or toxic substances. Summary of the Invention

[0006] Aiming at the above technical problems, the present invention provides a fully sealed adjustable throttling device. The connecting short pipe and the sealing shell are welded to form a complete sealing structure, which can avoid the risk of leakage under vibration and deformation conditions.

[0007] To achieve the above technical purpose, the present invention adopts the following technical solution: A fully sealed adjustable throttling device includes two connecting short pipes and a throttling assembly. The throttling assembly includes a sealing shell and a magnetic flow rate regulating assembly. The magnetic flow rate regulating assembly is fixed on the sealing shell. The two connecting short pipes are arranged at intervals along the same central axis. The throttling assembly is located between the two connecting short pipes, and the sealing shell is hermetically connected to the two connecting short pipes.

[0008] Furthermore, the magnetic flow regulating assembly includes a plurality of regulating vanes, a plurality of connecting rods, a fixed ring, a rotating ring, and an adjusting ring. The sealing housing, the adjusting ring, the rotating ring, and the fixed ring are all hollow ring plates made of stainless steel. The longitudinal sections of the sealing housing and the adjusting ring are both U-shaped with opposite openings and mirror symmetry. The outer peripheral side of the sealing housing is embedded in the hollow cavity of the adjusting ring, and the adjusting ring is rotatably connected to the sealing housing. A plurality of adjusting ring strong magnets are fixed inside the circumferential side wall of the adjusting ring. The two inner ring walls of the sealing housing are respectively fixedly connected to the circumferential side walls of a connecting short pipe. The rotating ring and the fixed ring are sequentially arranged from the inside to the outside in the hollow cavity of the sealing housing. The rotating ring is rotatably arranged inside the inner shell of the hollow cavity of the sealing housing. The inner ring wall of the fixed ring extends out of the sealing housing to between the two connecting short pipes, and the two outer side walls of the fixed ring are fixedly connected to the end walls of the two connecting short pipes. A plurality of connecting rods are evenly distributed in the hollow cavity of the rotating ring, and a plurality of regulating vanes are evenly distributed in the hollow cavity of the fixed ring. The regulating vanes are rotatably connected to the fixed ring. One end of the connecting rod is rotatably connected to the rotating ring, and the other end is fixedly connected to a regulating vane. The connecting rod rotates in the hollow cavity of the rotating ring driven by the rotating ring. The connection point between the regulating vane and the fixed ring and the connection point between the regulating vane and the connecting rod are located at both ends of the same side of the regulating vane. A plurality of regulating vanes rotate in the hollow cavity of the rotating ring, the hollow cavity of the fixed ring, and the range of the ring hole of the fixed ring under the drive of the connecting rod, and the plurality of regulating vanes can completely close the ring hole of the fixed ring. A plurality of rotating ring strong magnets are evenly distributed in the annular hollow cavity of the rotating ring, and the plurality of rotating ring strong magnets are magnetically attracted to the plurality of adjusting ring strong magnets.

[0009] Furthermore, the rotating ring is composed of two sub-rotating ring plates, and the two sub-rotating ring plates are fixedly connected at intervals along the same central axis. A plurality of the rotating ring strong magnets are evenly distributed between the two sub-rotating ring plates and are located on the outer peripheral side.

[0010] Furthermore, the cross-section of the rotating ring strong magnet is arc-shaped, and its outer diameter is the same as the outer diameter of the rotating ring. When the outer diameter of the pipeline where the throttling device is located is greater than 250 mm, bearings are provided between adjacent sub-rotating ring plates and sub-fixed ring plates.

[0011] Furthermore, the fixed ring is composed of two sub-fixed rings, and the two sub-fixed rings are fixedly connected at intervals along the same central axis. The outer diameter of the sub-fixed ring is the same as the inner diameter of the rotating plate, and the inner diameter of the sub-fixed plate is the same as the inner diameter of the connecting short pipe.

[0012] Furthermore, the cross-section of the adjusting ring strong magnet is arc-shaped, the radian of the adjusting ring strong magnet is the same as the radian of the rotating ring strong magnet, and the radial central axis of each adjusting ring strong magnet coincides with the radial median axis of a rotating ring strong magnet.

[0013] Further, when the connecting short pipe is connected to the single-wall pipe, the adjusting vane is surrounded by a fixed side surface, a first forming surface, and a second forming surface that are sequentially connected end to end. The fixed side surface is a plane. The connection points of the adjusting vane with the fixed ring and the connecting rod are located at the intersection points of the fixed side surface with the first forming surface and the second forming surface. The first forming surface and the second forming surface are arc surfaces with the same diameter. The second forming surface is located at the position where the first forming surface rotates 72° clockwise around the center of the connecting short pipe. Driven by the connecting rod, multiple adjusting vanes rotate within the hollow cavity of the rotating ring, the hollow cavity of the fixed ring, and the range within the ring hole of the fixed ring. Multiple adjusting vanes can completely close the ring hole of the fixed ring.

[0014] Further, when the connecting short pipe is connected to the double-wall pipe, the connecting short pipe is butted against the outer pipe of the double-wall pipe, and the inner pipe of the double-wall pipe passes through the inner cavity of the throttling device. The adjusting vane is surrounded by a fixed side surface, a first forming surface, a third forming surface, and a second forming surface that are sequentially connected end to end. The fixed side surface is a plane. The connection points of the adjusting vane with the fixed ring and the connecting rod are located at the intersection points of the fixed side surface with the first forming surface and the second forming surface. The first forming surface and the second forming surface are arc surfaces with the same diameter. The second forming surface is located on the arc where the first forming surface rotates 72° clockwise around the center of the connecting short pipe. The diameter of the circle where the third forming surface is located is the same as the outer diameter of the inner pipe of the double-wall pipe. Driven by the connecting rod, multiple adjusting vanes rotate within the hollow cavity of the rotating ring, the hollow cavity of the fixed ring, and the range between the inner wall and the outer wall of the double-wall pipe. Multiple adjusting vanes can completely close the cavity between the inner wall and the outer wall of the double-wall pipe.

[0015] Further, fixed cylinders are provided on the upper end surface at the intersection of the fixed side surface and the first forming surface of the adjusting vane and on the lower end surface at the intersection of the fixed side surface and the second forming surface. Fixed holes are provided at both ends of the fixed ring and the connecting rod. The fixed ring and the connecting rod are connected to the adjusting vane by passing the fixed cylinders through the fixed holes. A plurality of fixed cylinders for connecting with the connecting rod are evenly distributed between one sub-rotating piece. The connecting rod is rotatably connected to the rotating piece by passing the fixed cylinders through the fixed holes.

[0016] Further, opening scale lines are provided on the sealing housing. A window for observing the opening scale lines is provided at the relative position of the adjusting ring and the opening scale lines. An indicating line is provided on one side of the window. A limiting cylinder fixed to the sealing housing is provided outside the end with a larger numerical value of the opening scale line to limit the rotation angle range of the adjusting ring. A threaded hole is provided on the adjusting ring, and a locking nut is screwed into the threaded hole. By tightening the locking nut, the rotation of the adjusting ring can be prevented to fix the opening degree.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the fully sealed adjustable flow device of the present invention, the rotating ring and the adjusting ring rely on the strong magnetism of the rotating ring and the strong magnetism of the adjusting ring for interlocking. By adjusting the rotation angle of the adjusting ring, the angle of the rotating ring is synchronously changed, and the rotation angle of each adjusting blade is synchronously changed through the connecting rod, thereby changing the flow area and achieving the function of adjusting the flow rate. The connecting short pipe and the sealing housing form a complete sealing structure through welding, which can avoid the leakage risk under vibration and deformation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on the drawings.

[0019] Figure 1 FIG. is a schematic cross-sectional structure diagram of the fully enclosed state of the fully sealed adjustable flow device described in Embodiment 1 of the present invention.

[0020] Figure 2 FIG. is a schematic longitudinal-sectional structure diagram of the fully opened state of the fully sealed adjustable flow device described in Embodiment 1 of the present invention.

[0021] Figure 3 FIG. is a schematic longitudinal-sectional structure diagram of the semi-enclosed state of the fully sealed adjustable flow device described in Embodiment 1 of the present invention.

[0022] Figure 4 FIG. is a schematic structural diagram of the adjusting blade described in Embodiment 1 of the present invention.

[0023] Figure 5 FIG. is a schematic structural diagram of the opening degree indicating part in Embodiments 1 and 2 of the present invention.

[0024] Figure 6 FIG. is a schematic diagram of the calculation results of the present invention applied to a pipeline with an outer diameter of 114 mm and a wall thickness of 3 mm and an opening degree of 75 in Embodiment 1.

[0025] Figure 7 FIG. is a schematic diagram of the calculation results of the present invention applied to a pipeline with an outer diameter of 114 mm and a wall thickness of 3 mm and an opening degree of 50 in Embodiment 1.

[0026] Figure 8 FIG. is a schematic diagram of the calculation results of the present invention applied to a pipeline with an outer diameter of 114 mm and a wall thickness of 3 mm and an opening degree of 25 in Embodiment 1.

[0027] Figure 9Schematic cross-sectional structure diagram of the fully enclosed state of the fully sealed adjustable throttling device described in Embodiment 2 of the present invention.

[0028] Figure 10 Schematic cross-sectional structure diagram of the fully opened state of the fully sealed adjustable throttling device described in Embodiment 2 of the present invention.

[0029] Figure 11 Schematic structure diagram of the adjusting vane described in Embodiment 2 of the present invention.

[0030] Wherein, 1 - connecting short pipe, 2 - adjusting vane, 21 - first forming surface, 22 - second forming surface, 23 - third forming surface, 24 - fixed side surface, 25 - fixed cylinder, 3 - connecting rod, 4 - fixed ring, 41 - sub-fixed ring, 42 - fixing hole, 5 - rotating ring, 51 - rotating ring strong magnet, 52 - sub-rotating ring piece, 6 - sealing housing, 7 - adjusting ring, 61 - opening scale line, 62 - limiting cylinder, 71 - opening window, 72 - indicating line, 73 - locking nut, 74 - adjusting ring strong magnet, 8 - double-wall pipe, 9 - single-wall pipe. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that the present invention does not have to be implemented with these specific details. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present invention.

[0032] Throughout the specification, the reference to "an embodiment", "embodiment", "an example" or "example" means that the specific features, structures or characteristics described in connection with that embodiment or example are included in at least one embodiment of the present invention. Thus, the phrases "an embodiment", "embodiment", "an example" or "example" appearing throughout the specification do not necessarily all refer to the same embodiment or example. In addition, the specific features, structures or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] In the description of the present invention, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0034] Embodiment 1 In order to solve the technical problem that the ventilation outer pipe of the LNG ventilation double-wall pipe can not only adjust the flow rate but also avoid the risk of leakage, the present embodiment provides a fully sealed adjustable flow device.

[0035] As Figures 1 - 5 shown, a fully sealed adjustable flow device includes two connecting short pipes 1 and a throttling component. The throttling component includes a sealing housing 6 and a magnetic flow regulating component. The magnetic flow regulating component is fixed on the sealing housing 6. The two connecting short pipes 1 are arranged at intervals along the same central axis. The throttling component is located between the two connecting short pipes 1. The sealing housing 6 is hermetically connected to the two connecting short pipes 1. The magnetic flow regulating component includes five regulating vanes 2, five connecting rods 3, a fixing ring 4, a rotating ring 5 and a regulating ring 7. The sealing housing 6, the regulating ring 7, the rotating ring 5 and the fixing ring 4 are all hollow ring plates made of stainless steel. The longitudinal sections of the sealing housing 6 and the regulating ring 7 are both U-shaped with opposite openings and mirror-symmetrically arranged. The outer peripheral side of the sealing housing 6 is embedded in the hollow cavity of the regulating ring 7. The regulating ring 7 is rotatably connected to the sealing housing 6. Five regulating ring strong magnets 74 are fixed inside the circumferential side wall of the regulating ring 7. The two inner ring walls of the sealing housing 6 are respectively fixedly connected to the circumferential side walls of one connecting short pipe 1. The rotating ring 5 and the fixing ring 4 are sequentially arranged from the inside to the outside in the hollow cavity of the sealing housing 6. The rotating ring 5 is rotatably arranged inside the inner shell of the hollow cavity of the sealing housing 6. The inner ring wall of the fixing ring 4 extends out of the sealing housing 6 to between the two connecting short pipes 1. The two outer side walls of the fixing ring 4 are fixedly connected to the end walls of the two connecting short pipes 1. Five connecting rods 3 are evenly distributed in the hollow cavity of the rotating ring 5. Five regulating vanes 2 are evenly distributed in the hollow cavity of the fixing ring 4. The regulating vanes 2 are rotatably connected to the fixing ring 4. One end of the connecting rod 3 is rotatably connected to the rotating ring 5, and the other end is fixedly connected to one regulating vane 2. The connecting rod 3 rotates in the hollow cavity of the rotating ring 5 driven by the rotating ring 5. The connection point between the regulating vane 2 and the fixing ring 4 and the connection point between the regulating vane 2 and the connecting rod 3 are located at both ends of the same side of the regulating vane 2. The five regulating vanes 2 rotate within the range of the hollow cavity of the rotating ring 5, the hollow cavity of the fixing ring 4 and the ring holes of the fixing ring 4 under the drive of the connecting rod 3. The multiple regulating vanes 2 can completely close the ring holes of the fixing ring 4. A plurality of rotating ring strong magnets 51 are evenly distributed in the annular hollow cavity of the rotating ring 5. The five rotating ring strong magnets 51 are magnetically attracted to the five regulating ring strong magnets 74.

[0036] The rotating ring 5 is composed of two sub-rotating ring pieces 52. The two sub-rotating ring pieces 52 are fixedly connected at intervals along the same central axis. Five rotating ring strong magnets 51 are evenly distributed between the two sub-rotating ring pieces 52 and are located on the outer peripheral side. The cross-section of the rotating ring strong magnet 51 is arc-shaped, and its outer diameter is the same as that of the rotating ring 5. The fixed ring 4 is composed of two sub-fixed ring pieces 41. The two sub-fixed ring pieces 41 are fixedly connected at intervals along the same central axis. The outer diameter of the sub-fixed ring 41 is the same as the inner diameter of the rotating piece 5, and the inner diameter of the sub-fixed piece 41 is the same as the inner diameter of the connecting short pipe 1. The cross-section of the adjusting ring strong magnet 74 is arc-shaped, and the radian of the adjusting ring strong magnet 74 is the same as that of the rotating ring strong magnet 51. Moreover, the radial central axis of each adjusting ring strong magnet 74 coincides with the radial median axis of a rotating ring strong magnet 51.

[0037] When the outer diameter of the outer tube of the double-wall tube 8 is greater than 250 mm, bearings are added between adjacent sub-rotating ring pieces 51 and sub-fixed ring pieces 41 to reduce the rotating torque.

[0038] The connecting short pipe 1 is butted with the outer tube of the double-wall tube 8. The inner tube of the double-wall tube 8 passes through the inner cavity of the throttling device. The adjusting blade 2 is surrounded by a fixed side surface 24, a first forming surface 21, a third forming surface 23, and a second forming surface 22 that are connected end to end in sequence. The fixed side surface 24 is a plane. The connection points of the adjusting blade 2 with the fixed ring 4 and the connecting rod 3 are located at the intersection points of the fixed side surface 24 with the first forming surface 21 and the second forming surface 22. The first forming surface 21 and the second forming surface 22 are arc surfaces with the same diameter. The second forming surface 22 is on the arc where the first forming surface 21 rotates 72° clockwise around the center of the connecting short pipe 1. The diameter of the circle where the third forming surface 23 is located is the same as the inner diameter of the inner tube of the double-wall tube. Five adjusting blades 2 rotate within the range between the hollow cavity of the rotating ring 5, the hollow cavity of the fixed ring 4, and the inner wall and outer wall of the double-wall tube 8 under the drive of the connecting rod 3. When rotated to the maximum angle, the first forming surfaces 21 and the second forming surfaces 22 of adjacent two adjusting blades 2 are butted, and the third forming surfaces 23 of the five adjusting blades 2 enclose a circle, completely closing the cavity between the inner wall and the outer wall of the double-wall tube 8.

[0039] Fixed cylinders 25 are provided on the upper end surface at the intersection point of the fixed side surface 24 and the first forming surface 21 of the adjusting blade 2 and on the lower end surface at the intersection point of the fixed side surface 24 and the second forming surface 22. Fixed holes are provided at both ends of the sub-fixed ring 41 and the connecting rod 3. The fixed ring 4 and the connecting rod 3 are connected to the adjusting blade 2 through the fixed cylinders 25 passing through the fixed holes 42. Five fixed cylinders for connecting with the connecting rod 3 are evenly distributed between one sub-rotating piece 52. The connecting rod 3 is rotationally connected to the rotating piece 5 through the fixed cylinders passing through the fixed holes.

[0040] An opening scale line 61 is provided on the sealed housing 6. A window 71 for observing the opening scale line is provided at the relative position of the adjusting ring 7 and the opening scale line 61. An indicating line 72 is provided on one side of the window 71. A limit cylinder 62 fixed to the sealed housing 6 is provided outside the end with a larger value of the opening scale line 61 to limit the rotation angle range of the adjusting ring 7. A threaded hole is provided on the adjusting ring 7, and a locking nut 73 is screwed into the threaded hole. By tightening the locking nut 73, the rotation of the adjusting ring 7 can be prevented to fix the opening degree.

[0041] The above throttling device is applied to a pipeline with an outer diameter of 114 mm and a wall thickness of 3 mm under the condition of an air flow rate of 5 m / s, and CFD simulations are carried out at different opening degrees. The CFD calculated flow field streamline diagram is as Figures 6 - 8 shown, and Table 1 is the calculated pressure drop table.

[0042] Table 1

[0043]

[0044] From Figures 6 - 8 it can be seen that the flow field is relatively stable, indicating that the throttling effect is relatively stable. Embodiment

[0045] To solve the technical problems of flow regulation of single-wall pipes and avoid the risk of leakage, this embodiment provides a fully sealed adjustable throttling device.

[0046] In the throttling device of this embodiment, except that the shape of the adjusting blade 2 is different from that in Embodiment 1, the structures of other parts are the same as those of the throttling device in Embodiment 1. In this embodiment, when the connecting short pipe 1 is connected to the single-wall pipe 9, the adjusting blade 2 is surrounded by a fixed side surface 24, a first forming surface 21, and a second forming surface 22 that are connected end to end in sequence. The fixed side surface 21 is a plane. The connection points of the adjusting blade 2 with the fixed ring 4 and the connecting rod 3 are located at the intersection points of the fixed side surface 24 with the first forming surface 21 and the second forming surface 22. The first forming surface 21 and the second forming surface 22 are arc surfaces with the same diameter. The second forming surface 22 is located at the position where the first forming surface 21 rotates 72° clockwise around the center of the connecting short pipe 1. The 5 adjusting blades 2 rotate within the hollow cavity of the rotating ring 5, the hollow cavity of the fixed ring 4, and the range of the ring hole of the fixed ring 4 under the drive of the connecting rod 3. When rotated to the maximum angle, the 5 adjusting blades 2 can completely close the ring hole of the fixed ring 4.

[0047] The above specific implementation manners further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully sealed adjustable throttling device, characterized in that, It includes two connecting short pipes and a throttling component. The throttling component includes a sealed housing and a magnetic flow regulating component. The magnetic flow regulating component is fixed on the sealed housing. The two connecting short pipes are arranged at intervals along the same central axis. The throttling component is located between the two connecting short pipes, and the sealed housing is hermetically connected to the two connecting short pipes. The magnetic flow regulating component includes a plurality of regulating vanes, a plurality of connecting rods, a fixed ring, a rotating ring and an adjusting ring. The sealed housing, the adjusting ring, the rotating ring and the fixed ring are all hollow ring plates made of stainless steel. The longitudinal sections of the sealed housing and the adjusting ring are both U-shaped with opposite openings and mirror-symmetrically arranged. The outer peripheral side of the sealed housing is embedded in the hollow cavity of the adjusting ring, and the adjusting ring is rotatably connected to the sealed housing. A plurality of adjusting ring strong magnets are fixed inside the circumferential side wall of the adjusting ring. The two inner ring walls of the sealed housing are respectively fixedly connected to the circumferential side walls of one connecting short pipe. The rotating ring and the fixed ring are sequentially arranged from the inside to the outside in the hollow cavity of the sealed housing. The rotating ring is rotatably arranged in the inner shell of the hollow cavity of the sealed housing. The inner ring wall of the fixed ring extends out of the sealed housing to between the two connecting short pipes, and the two outer side walls of the fixed ring are fixedly connected to the end walls of the two connecting short pipes. A plurality of connecting rods are evenly distributed in the hollow cavity of the rotating ring, and a plurality of regulating vanes are evenly distributed in the hollow cavity of the fixed ring. The regulating vanes are rotatably connected to the fixed ring. One end of the connecting rod is rotatably connected to the rotating ring, and the other end is fixedly connected to one regulating vane. The connecting rod rotates in the hollow cavity of the rotating ring driven by the rotating ring. The connection point between the regulating vane and the fixed ring and the connection point between the regulating vane and the connecting rod are located at both ends of the same side of the regulating vane. A plurality of rotating ring strong magnets are evenly distributed in the annular hollow cavity of the rotating ring, and the plurality of rotating ring strong magnets are magnetically attracted to the plurality of adjusting ring strong magnets. The rotating ring is composed of two sub-rotating ring plates, and the two sub-rotating ring plates are fixedly connected at intervals along the same central axis. The plurality of rotating ring strong magnets are evenly distributed between the two sub-rotating ring plates and are located on the outer peripheral side.

2. The fully sealed adjustable flow device according to claim 1, characterized in that The cross-section of the rotating ring strong magnet is arc-shaped, and its outer diameter is the same as the outer diameter of the rotating ring. When the outer diameter of the pipeline where the throttling device is located is greater than 250 mm, bearings are provided between adjacent sub-rotating ring plates and sub-fixed ring plates.

3. The fully sealed adjustable flow device according to claim 1, wherein The fixed ring is composed of two sub-fixed rings, and the two sub-fixed rings are fixedly connected at intervals along the same central axis. The outer diameter of the sub-fixed ring is the same as the inner diameter of the rotating plate, and the inner diameter of the sub-fixed plate is the same as the inner diameter of the connecting short pipe.

4. The fully sealed adjustable flow device according to claim 1, wherein, The cross-section of the adjusting ring strong magnet is arc-shaped, the arc of the adjusting ring strong magnet is the same as the arc of the rotating ring strong magnet, and the radial central axis of each adjusting ring strong magnet coincides with the radial median axis of one rotating ring strong magnet.

5. The fully sealed adjustable flow device according to claim 1, characterized in that When the connecting short pipe is connected to the single-wall pipe, the adjusting vane is surrounded by a fixed side surface, a first forming surface, and a second forming surface that are sequentially connected end to end. The fixed side surface is a plane. The connection points of the adjusting vane with the fixed ring and the connecting rod are located at the intersections of the fixed side surface with the first forming surface and the second forming surface. The first forming surface and the second forming surface are arc surfaces with the same diameter. The second forming surface is located at the position where the first forming surface rotates 72° clockwise around the center of the connecting short pipe. Driven by the connecting rod, multiple adjusting vanes rotate within the hollow cavity of the rotating ring, the hollow cavity of the fixed ring, and the range within the ring hole of the fixed ring. Multiple adjusting vanes can completely close the ring hole of the fixed ring.

6. The all-sealed adjustable flow device according to claim 1, characterized in that, When the connecting short pipe is connected to the double-wall pipe, the connecting short pipe is butted against the outer pipe of the double-wall pipe, and the inner pipe of the double-wall pipe passes through the inner cavity of the throttling device. The adjusting vane is surrounded by a fixed side surface, a first forming surface, a third forming surface, and a second forming surface that are sequentially connected end to end. The fixed side surface is a plane. The connection points of the adjusting vane with the fixed ring and the connecting rod are located at the intersections of the fixed side surface with the first forming surface and the second forming surface. The first forming surface and the second forming surface are arc surfaces with the same diameter. The second forming surface is on the arc where the first forming surface rotates 72° clockwise around the center of the connecting short pipe. The diameter of the circle where the third forming surface is located is the same as the outer diameter of the inner pipe of the double-wall pipe. Driven by the connecting rod, multiple adjusting vanes rotate within the hollow cavity of the rotating ring, the hollow cavity of the fixed ring, and the range between the inner wall and the outer wall of the double-wall pipe. Multiple adjusting vanes can completely close the cavity between the inner wall and the outer wall of the double-wall pipe.

7. The fully sealed adjustable flow device according to claim 5 or 6, characterized in that, Fixed cylinders are provided on the upper end surface at the intersection of the fixed side surface and the first forming surface of the adjusting vane and on the lower end surface at the intersection of the fixed side surface and the second forming surface. Fixed holes are provided at both ends of the fixed ring and the connecting rod. The fixed ring and the connecting rod are connected to the adjusting vane by passing the fixed cylinders through the fixed holes. A plurality of fixed cylinders for connecting with the connecting rod are evenly distributed between one sub-rotating piece. The connecting rod is rotatably connected to the rotating piece by passing the fixed cylinders through the fixed holes.

8. The fully sealed adjustable flow device according to claim 5 or 6, characterized in that, Opening scale lines are provided on the sealing housing. A window for observing the opening scale lines is provided at the relative position of the adjusting ring and the opening scale lines. An indicating line is provided on one side of the window. A limit cylinder fixed to the sealing housing is provided outside the end with a larger value of the opening scale line to limit the rotation angle range of the adjusting ring. A threaded hole is provided on the adjusting ring, and a locking nut is screwed in the threaded hole. By tightening the locking nut, the rotation of the adjusting ring can be prevented to fix the opening degree.

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