Check valve device for controlling steam of steam turbine

Abstract

The invention discloses a check valve device for controlling steam of a steam turbine, and relates to the field of check valves, the check valve device comprises a check valve body, two sides of the check valve body are respectively provided with an air inlet flange and an output flange, and the check valve body is internally provided with a valve cover and a valve rod. It needs to be explained that when steam recoils, a labyrinth type channel is formed through a first recoil plate and a second recoil plate, and two semicircular rotating plates are arranged in the front-back direction, so that the steam channel for normal circulation is guaranteed, the rotating plates can be pushed through the power of the steam to generate bounce during backflow, and the impact kinetic energy of backflow steam is dispersed; in addition, when the valve cover is closed, steam impacts the valve cover, under the resilience force of a plurality of buffer springs, the buffer sealing plate can keep sealing the air inlet flange, through opening and closing linkage with the valve plate, the pressure relief tank is closed during normal circulation to avoid steam loss, the pressure relief tank is opened during backflow to provide a pressure relief space, and the pressure relief space of the valve is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of check valve technology, and more particularly to a check valve device for controlling steam in a steam turbine. Background Technology

[0002] A check valve is an automatic valve that relies on the pressure of the medium itself and the weight of the valve disc to automatically block backflow. It belongs to the category of automatic valves, and its valve disc movement methods include lift, swing, and butterfly types. The lift type is structurally similar to a gate valve but lacks a valve stem, while the swing type uses an inclined valve disc rotating around an axis. This valve is widely used in petrochemical, water supply and drainage systems, and as a foot valve in pumping units. It prevents water hammer and medium backflow, and when used in combination with a gate valve, it can achieve a safe isolation function. The check valve plays a crucial role in steam turbine systems, as it is an important device to prevent steam, water, and extraction gas from flowing back into the turbine, avoiding damage to blades, rotor reversal, and water hammer.

[0003] It should be noted that steam check valves, as core components in steam systems that prevent backflow of the medium and protect equipment, are susceptible to backflow due to impurities such as rust, scale, welding slag, and pipe oxide scale in the steam getting stuck between the sealing surfaces. This damages the seal, leading to condensate backflow in related equipment, system pressure loss, a significant decrease in heating efficiency, and a surge in energy consumption. Furthermore, check valves in steam systems also present a unique water hammer problem. If steam pipes are not drained in time, the valve may suddenly close during backflow, or the steam supply may be interrupted. The steam inside the pipes will rapidly condense into water, creating a negative pressure water hammer. The valve disc, after being pulled back, will violently impact the valve seat, causing direct impact on the valve disc, valve seat, and valve body. This can lead to deformation of the sealing surfaces, cracks in the valve body, and even valve disc breakage. The water hammer pressure is also transmitted to the pipeline, causing pipeline vibration, flange loosening, and pipeline rupture. In severe cases, it can damage core equipment such as boilers, heat exchangers, or steam turbines. Summary of the Invention

[0004] The purpose of this invention is to provide a check valve device for controlling steam in a steam turbine, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A check valve device for controlling steam in a steam turbine includes a check valve body, an inlet flange and an outlet flange on both sides of the check valve body, a valve cover and a valve stem installed inside the check valve body, and a linkage push rod installed on the valve stem. The valve stem pushes the linkage push rod to move, thereby pushing the valve cover to close. It also includes a labyrinth anti-reverse mechanism, which is installed in the check valve body and is used to buffer the backflow gas; the labyrinth anti-reverse mechanism includes a backflow sleeve, which is installed on the output flange, and two first backflow plates and two second backflow plates are rotatably mounted on the backflow sleeve; It also includes a cover buffer protection mechanism, which is installed on the valve cover and is used to actively clean the valve cover. The cover buffer protection mechanism includes a swinging scraper, which is rotatably installed on one side of the valve cover. The swinging scraper is used to swing and clean the valve cover. A cleaning mounting sleeve is installed on the other side of the valve cover. A connecting rod is rotatably installed inside the cleaning mounting sleeve. The swinging scraper is installed on the connecting rod. A squeezing drive frame is slidably installed inside the cleaning mounting sleeve. The squeezing drive frame is connected to the connecting rod in a transmission manner.

[0007] Furthermore, in a preferred embodiment of the present invention, the labyrinth anti-reverse mechanism further includes an opening and closing bracket, the opening and closing bracket is installed on the backflow sleeve, and an opening and closing seat is installed on the top inner wall of the check valve body, and the opening and closing bracket is rotatably installed on the opening and closing seat. The opening and closing bracket is provided with an opening and closing sliding hole, and the linkage push rod is equipped with an opening and closing sliding shaft, which is slidably installed in the opening and closing sliding hole.

[0008] Furthermore, in a preferred embodiment of the present invention, a backflush bracket is installed on the backflush sleeve, and both first backflush plates are rotatably mounted on the backflush bracket; The first recoil plate has a first mounting cavity, and a first mounting shaft is rotatably mounted in the first mounting cavity. The first mounting shaft is mounted on the recoil bracket. A first recoil torsion spring is mounted on the first mounting shaft, and the first recoil torsion spring is mounted on the inner wall of the first mounting cavity.

[0009] Furthermore, in a preferred embodiment of the present invention, two recoil seats are installed on the recoil sleeve, and two second recoil plates are rotatably installed on the two recoil seats respectively; The recoil seat is provided with a second mounting cavity, and a second mounting shaft is rotatably mounted in the second mounting cavity. The second recoil plate is mounted on the second mounting shaft. A second recoil torsion spring is mounted on the second mounting shaft, and the second recoil torsion spring is mounted on the inner wall of the second mounting cavity.

[0010] Furthermore, in a preferred embodiment of the present invention, the cover buffer protection mechanism further includes a buffer sealing plate, which is movably installed inside the valve cover; Multiple buffer springs are installed on one side of the buffer sealing plate, and all of the buffer springs are installed on the valve cover.

[0011] Furthermore, in a preferred embodiment of the present invention, a drive sleeve is sleeved on the adapter rod, and a drive groove is provided on the outer surface of the drive sleeve in an annular inclined manner. An extrusion pusher is mounted on the extrusion drive frame, and the extrusion pusher is movably mounted in the drive groove.

[0012] Furthermore, in a preferred embodiment of the present invention, a return spring is installed on one side of the extrusion drive frame, and the return spring is installed on the inner wall of the cleaning mounting sleeve.

[0013] Furthermore, in a preferred embodiment of the present invention, an active pressure relief mechanism is also included, which is installed on the bottom side of the check valve body and is used to expand the pressure relief space; The active pressure relief mechanism includes a pressure relief tank, which is installed on the bottom side of the check valve body, and a pressure relief plate is movably installed inside the pressure relief tank.

[0014] Furthermore, in a preferred embodiment of the present invention, a pressure relief bracket is installed on the bottom inner wall of the pressure relief tank, the pressure relief plate is movably installed on the pressure relief bracket, and a pressure relief pusher is installed on the pressure relief plate; A sealing spring is installed on the inner wall of the pressure relief plate, and the sealing spring is mounted on the pressure relief bracket.

[0015] Furthermore, in a preferred embodiment of the present invention, two pressure relief sealing plates are rotatably installed on the bottom side of the pressure relief tank, and the pressure relief sealing plates are rotatably opened for pressure relief; A pressure relief seat is installed on the pressure relief sealing plate. The pressure relief seat is rotatably installed on the bottom side of the pressure relief tank. A pressure relief mounting cavity is opened on the pressure relief seat. A pressure relief mounting shaft is rotatably installed in the pressure relief mounting cavity. The pressure relief mounting shaft is installed on the pressure relief tank. A sealing torsion spring is installed on the pressure relief mounting shaft. The sealing torsion spring is installed on the inner wall of the pressure relief mounting cavity.

[0016] The beneficial effects of the check valve device for controlling steam in a steam turbine proposed in this invention are: In this invention, the labyrinth anti-backflow mechanism, when steam backflow occurs, firstly, blows the two first backflow plates to rotate, causing the first backflow torsion spring to be stressed, thus providing a first-level buffer for the backflowing steam. If the steam impact force is large, it may even impact the second backflow plate, causing the second backflow torsion spring to be stressed, further weakening the steam impact force. It should be noted that the labyrinthine channel formed by the first and second backflow plates weakens the steam impact force and effectively avoids steam backflow. In addition, the two semi-circular rotating plates are arranged in opposite directions, ensuring a normal steam flow channel while allowing the rotating plates to generate a rebound force through the steam's own power during backflow, dispersing the impact kinetic energy of the backflowing steam. Furthermore, the buffering method utilizes the energy of the medium itself, requiring no external drive, and is suitable for the operating conditions of the steam system.

[0017] Furthermore, in this invention, through the setting of the cover buffer protection mechanism, when the valve cover is opened, the valve cover is blown open by steam, causing the valve cover to drive the cleaning mounting sleeve to rotate, which in turn causes the cleaning mounting sleeve to drive the extrusion drive frame to rotate. The movement of the extrusion drive frame causes the extrusion push block to move, and the extrusion push block moves in the drive groove, thereby pushing the drive sleeve to rotate. The rotation of the drive sleeve drives the swing scraper to rotate through the adapter rod, thereby cleaning the valve cover and preventing impurities from adhering to the surface of the valve cover, which could affect the valve cover's sealing performance or cause corrosion. Similarly, when the valve cover is closed, the steam impacts the valve cover, causing the buffer sealing plate to be impacted, which in turn causes multiple buffer springs to be stressed. Under the rebound force of the multiple buffer springs, the buffer sealing plate can maintain a seal against the air inlet flange, avoiding the "water hammer" effect from affecting the valve cover's seal.

[0018] Furthermore, in this invention, by setting an active pressure relief mechanism, when the valve cover is opened, the pressure relief pusher can be moved, causing the pressure relief plate to open automatically, thereby allowing the pressure relief tank to be opened and used, providing additional pressure relief space. Moreover, if the pressure is too high, the two pressure relief sealing plates can be pushed open, allowing the pressure relief sealing plates to rotate on the pressure relief tank via the pressure relief seat. The pressure relief seat rotates on the pressure relief mounting shaft via the pressure relief mounting cavity, causing the sealing torsion spring to be stressed. Therefore, after the pressure relief is completed, the pressure relief sealing plates can be closed by the rotational force of the sealing torsion spring. Thus, by linking the opening and closing of the valve plate, the pressure relief tank is closed during normal flow to avoid steam loss, and the pressure relief tank is opened during backflow to provide pressure relief space, solving the contradiction between the flow and pressure relief of the traditional gas chamber. It should be noted that through the coordinated anti-hammer mechanism of "buffering impact kinetic energy and pressure relief space compensation", the impact of backflowing steam is buffered from the kinetic energy level, and the pressure relief tank provides a release channel for the backflowing medium from the spatial level. This solves the problem from the perspective of instantaneous impact of water hammer formation and lack of pressure relief space for the medium, effectively ensuring the safe use of the valve. Attached Figure Description

[0019] Figure 1A three-dimensional structural schematic diagram of a check valve device for controlling steam in a steam turbine, provided in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the connection between the check valve body and the labyrinth anti-reverse mechanism of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 3 This is a partial cross-sectional view of the connection between the backflow sleeve and the second backflow plate of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 4 This is a partial cross-sectional view of the connection between the backflow support and the first backflow plate of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 5 This is a partial cross-sectional view of the connection between the backflow seat and the second backflow plate of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 6 This is a partial structural diagram illustrating the connection between the backflow sleeve and the opening / closing bracket of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the connection between the swing scraper and the buffer sealing plate of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 8 This is a partial cross-sectional view of the connection between the swing scraper and the buffer sealing plate of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention. Figure 9 This invention provides a check valve device for controlling steam in a steam turbine. Figure 8 A schematic diagram of the structure of part A; Figure 10 This is a partial cross-sectional view of the connection between the pressure relief tank and the pressure relief plate of a check valve device for controlling steam in a steam turbine, provided in an embodiment of the present invention. Figure 11 This is a partial cross-sectional view of the connection between the pressure relief sealing plate and the pressure relief seat of a check valve device for controlling steam in a steam turbine, as provided in an embodiment of the present invention.

[0020] In the diagram: 1-Check valve body; 2-Inlet flange; 3-Outlet flange; 4-Valve cover; 5-Valve stem; 6-Linkage push rod; 7-Labyrinth anti-reverse mechanism; 701-Recoil sleeve; 702-Recoil bracket; 703-First recoil plate; 704-Recoil seat; 705-Second recoil plate; 706-First mounting cavity; 707-First mounting shaft; 708-First recoil torsion spring; 709-Second mounting cavity; 710-Second mounting shaft; 711-Second recoil torsion spring; 712-Opening / closing seat; 713-Opening / closing bracket; 714-Opening / closing slide hole; 715-Opening / closing slide shaft; 8-Cover body Buffer protection mechanism; 801-Swing scraper; 802-Buffer sealing plate; 803-Buffer spring; 804-Cleaning mounting sleeve; 805-Adapter rod; 806-Drive sleeve; 807-Extrusion drive frame; 808-Drive groove; 809-Extrusion push block; 810-Return spring; 9-Active pressure relief mechanism; 901-Pressure relief tank; 902-Pressure relief plate; 903-Pressure relief bracket; 904-Pressure relief push frame; 905-Sealing spring; 906-Pressure relief sealing plate; 907-Pressure relief seat; 908-Pressure relief mounting cavity; 909-Pressure relief mounting shaft; 910-Sealing torsion spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] Furthermore, in the description of this invention, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "perpendicular" do not imply that components must be absolutely vertical, but rather that they can be slightly tilted. For example, "vertical" simply means that its direction is more vertical relative to "horizontal," not that the structure must be completely vertical, but can be slightly tilted.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please refer to the attached instruction manual. Figures 1-11 The present invention provides a check valve device for controlling steam in a steam turbine, which includes a check valve body 1, an inlet flange 2 and an outlet flange 3 respectively provided on both sides of the check valve body 1, a valve cover 4 and a valve stem 5 installed inside the check valve body 1, and a linkage push rod 6 installed on the valve stem 5. The valve stem 5 pushes the linkage push rod 6 to move, thereby pushing the valve cover 4 to close.

[0028] Further, please refer to the appendix to the instruction manual. Figures 3-6The present invention provides a check valve device for controlling steam in a steam turbine, which further includes a labyrinth anti-reverse mechanism 7. The labyrinth anti-reverse mechanism 7 is installed inside the check valve body 1, and the check valve body 1 is used to buffer the backflowing gas. Specifically, the labyrinth anti-reverse mechanism 7 includes a backflow sleeve 701, which is installed on the output flange 3. Two first backflow plates 703 and two second backflow plates 705 are rotatably installed on the backflow sleeve 701. It should be noted that, in this embodiment of the invention, when the check valve body 1 is activated, the valve stem 5 drives the linkage push rod 6 to move, the linkage push rod 6 pushes the valve cover 4 to close the inlet flange 2, and at the same time drives the opening and closing slide shaft 715 to move, so that the opening and closing slide shaft 715 drives the opening and closing bracket 713 to rotate on the opening and closing seat 712, and at the same time, the opening and closing slide shaft 715 slides in the opening and closing slide hole 714, so that the opening and closing bracket 713 drives the backflow sleeve 701 to close the output flange 3; when steam backflow occurs, the impact force of steam is weakened by the rotation of the two first backflow plates 703 and the two second backflow plates 705, and the labyrinthine channel formed by the first backflow plates 703 and the second backflow plates 705 further weakens the impact force of steam, effectively avoiding steam backflow.

[0029] More specifically, in this embodiment of the invention, a cover buffer protection mechanism 8 is also included. The cover buffer protection mechanism 8 is installed on the valve cover 4 and is used to actively clean the valve cover 4. The cover buffer protection mechanism 8 includes a swinging scraper 801, which is rotatably installed on one side of the valve cover 4. The swinging scraper 801 is used to swing and clean the valve cover 4. A cleaning mounting sleeve 804 is installed on the other side of the valve cover 4. A connecting rod 805 is rotatably installed inside the cleaning mounting sleeve 804. The swinging scraper 801 is installed on the connecting rod 805. A pressing drive frame 807 is slidably installed inside the cleaning mounting sleeve 804. The pressing drive frame 807 is connected to the connecting rod 805 in a transmission manner. It should be noted that in this embodiment of the invention, when the valve cover 4 is opened, the valve cover 4 is blown open by steam, the valve cover 4 drives the cleaning mounting sleeve 804 to rotate, the cleaning mounting sleeve 804 drives the extrusion drive frame 807 to rotate, so that the extrusion drive frame 807 is squeezed by the inner wall of the check valve body 1, thereby causing the extrusion drive frame 807 to retract, thereby driving the swing scraper 801 to rotate through the adapter rod 805, realizing the cleaning of the valve cover 4, ensuring the cleanliness of the valve cover 4, and thus ensuring the sealing of the valve cover 4.

[0030] Please continue to refer to the instruction manual appendix. Figures 3-6 Furthermore, the non-return valve device for controlling steam in a steam turbine provided in this embodiment of the invention includes a labyrinth anti-reverse mechanism 7 that further includes an opening and closing bracket 713. The opening and closing bracket 713 is installed on the backflow sleeve 701, and an opening and closing seat 712 is installed on the inner wall of the top side of the non-return valve body 1. The opening and closing bracket 713 is rotatably installed on the opening and closing seat 712. Furthermore, the opening / closing bracket 713 is provided with an opening / closing sliding hole 714, and the linkage push rod 6 is equipped with an opening / closing sliding shaft 715, which is slidably installed in the opening / closing sliding hole 714. It should be noted that, in this embodiment of the invention, when the check valve body 1 is activated, the valve stem 5 drives the linkage push rod 6 to move, causing the linkage push rod 6 to push the valve cover 4 to close the air inlet flange 2, and at the same time drive the opening / closing sliding shaft 715 to move, causing the opening / closing sliding shaft 715 to drive the opening / closing bracket 713 to rotate on the opening / closing seat 712, while the opening / closing sliding shaft 715 slides in the opening / closing sliding hole 714, so that the opening / closing bracket 713 drives the backflushing sleeve 701 to close the output flange 3.

[0031] More specifically, in this embodiment of the invention, a recoil bracket 702 is installed on the recoil sleeve 701, and two first recoil plates 703 are rotatably installed on the recoil bracket 702; a first mounting cavity 706 is opened on the first recoil plate 703, and a first mounting shaft 707 is rotatably installed in the first mounting cavity 706, and the first mounting shaft 707 is installed on the recoil bracket 702. Furthermore, a first recoil torsion spring 708 is mounted on the first mounting shaft 707, and the first recoil torsion spring 708 is mounted on the inner wall of the first mounting cavity 706. It should be noted that, in this embodiment of the invention, when steam recoils, the two first recoil plates 703 are first blown to rotate, causing the first recoil plates 703 to rotate within the first mounting cavity 706 via the first mounting shaft 707, and causing the first recoil torsion spring 708 to be stressed, thereby providing a primary buffer against the recoil steam under the rotational force of the first recoil torsion spring 708.

[0032] More specifically, in this embodiment of the invention, two recoil seats 704 are installed on the recoil sleeve 701, and two second recoil plates 705 are rotatably installed on the two recoil seats 704 respectively; a second mounting cavity 709 is opened on the recoil seat 704, and a second mounting shaft 710 is rotatably installed in the second mounting cavity 709, and the second recoil plates 705 are installed on the second mounting shaft 710. Furthermore, a second recoil torsion spring 711 is mounted on the second mounting shaft 710, and the second recoil torsion spring 711 is installed on the inner wall of the second mounting cavity 709. It should be noted that, in this embodiment of the invention, if the steam impact force is large, or even impacts the second recoil plate 705, causing the second recoil plate 705 to drive the second mounting shaft 710 to rotate within the second mounting cavity 709, and causing the second recoil torsion spring 711 to be stressed, thereby further weakening the steam impact force under the rotational force of the second recoil torsion spring 711.

[0033] Please refer to the instruction manual attached. Figures 7-9Furthermore, the non-return valve device for controlling steam in a steam turbine provided in this embodiment of the invention includes a cover buffer protection mechanism 8 that further includes a buffer sealing plate 802, which is movably installed inside the valve cover 4. Multiple buffer springs 803 are installed on one side of the buffer sealing plate 802, and all the buffer springs 803 are mounted on the valve cover 4. It should be noted that in this embodiment of the invention, when the valve cover 4 is closed, steam impacts the valve cover 4, causing the buffer sealing plate 802 to be impacted, which in turn drives the multiple buffer springs 803 to bear force. Under the rebound force of the multiple buffer springs 803, the buffer sealing plate 802 can maintain a seal against the inlet flange 2.

[0034] More specifically, in this embodiment of the invention, a drive sleeve 806 is sleeved on the adapter rod 805, and a drive groove 808 is annularly inclined on the outer surface of the drive sleeve 806; a squeeze push block 809 is installed on the squeeze drive frame 807, and the squeeze push block 809 is movably installed in the drive groove 808. It should be noted that, in this embodiment of the invention, when the valve cover 4 is opened, the valve cover 4 is blown open by steam, the valve cover 4 drives the cleaning mounting sleeve 804 to rotate, the cleaning mounting sleeve 804 drives the squeeze drive frame 807 to rotate, so that the squeeze drive frame 807 is squeezed by the inner wall of the check valve body 1, thereby causing the squeeze drive frame 807 to retract, the movement of the squeeze drive frame 807 drives the squeeze push block 809 to move, the squeeze push block 809 moves in the drive groove 808, thereby pushing the drive sleeve 806 to rotate, the rotation of the drive sleeve 806 drives the swing scraper 801 to rotate through the adapter rod 805, thereby cleaning the valve cover 4.

[0035] Please continue to refer to the instruction manual appendix. Figures 7-9 More specifically, in this embodiment of the invention, a return spring 810 is installed on one side of the extrusion drive frame 807, and the return spring 810 is installed on the inner wall of the cleaning mounting sleeve 804. It should be noted that, in this embodiment of the invention, the return force of the return spring 810 can help the extrusion drive frame 807 to reset, thereby driving the swing scraper 801 to return to its original position, realizing the back-and-forth swing of the swing scraper 801, so that cleaning can be performed when the valve cover 4 is opened and closed.

[0036] Please refer to the instruction manual attached. Figures 10-11 Furthermore, the non-return valve device for controlling turbine steam provided in this embodiment of the invention also includes an active pressure relief mechanism 9, which is installed on the bottom side of the non-return valve body 1 and is used to expand the pressure relief space. Specifically, the active pressure relief mechanism 9 includes a pressure relief tank 901, which is installed on the bottom side of the check valve body 1, and a pressure relief plate 902 is movably installed inside the pressure relief tank 901. It should be noted that in this embodiment of the invention, when the valve cover 4 is closed, the pressure relief plate 902 automatically opens, thereby allowing the pressure relief tank 901 to be opened and used, providing additional pressure relief space. Furthermore, if the pressure is too high, the two pressure relief sealing plates 906 can be pushed open and rotated to effectively protect the check valve body 1.

[0037] More specifically, in this embodiment of the invention, a pressure relief bracket 903 is installed on the bottom inner wall of the pressure relief tank 901, a pressure relief plate 902 is movably installed on the pressure relief bracket 903, and a pressure relief pusher 904 is installed on the pressure relief plate 902; Furthermore, a sealing spring 905 is installed on the inner wall of the pressure relief plate 902, and the sealing spring 905 is mounted on the pressure relief bracket 903. It should be noted that, in this embodiment of the invention, when the valve cover 4 is closed, the pressure relief pusher 904 can also be pushed to move. The pressure relief pusher 904 causes the pressure relief plate 902 to slide on the pressure relief bracket 903, and forces the sealing spring 905, thereby automatically opening the pressure relief plate 902, allowing the pressure relief tank 901 to be opened and used, providing additional pressure relief space.

[0038] Please continue to refer to the instruction manual appendix. Figures 10-11 More specifically, in this embodiment of the invention, two pressure relief sealing plates 906 are rotatably installed on the bottom side of the pressure relief tank 901. The pressure relief sealing plates 906 are rotatably opened for pressure relief. A pressure relief seat 907 is installed on the pressure relief sealing plate 906. The pressure relief seat 907 is rotatably installed on the bottom side of the pressure relief tank 901. A pressure relief mounting cavity 908 is opened on the pressure relief mounting cavity 908. A pressure relief mounting shaft 909 is rotatably installed in the pressure relief mounting cavity 908. The pressure relief mounting shaft 909 is installed on the pressure relief tank 901. A sealing torsion spring 910 is installed on the pressure relief mounting shaft 909. The sealing torsion spring 910 is installed on the inner wall of the pressure relief mounting cavity 908. It should be noted that, in this embodiment of the invention, when the pressure inside the check valve body 1 is too high, the two pressure relief sealing plates 906 can be pushed open, so that the pressure relief sealing plates 906 can rotate on the pressure relief tank 901 through the pressure relief seat 907, and the pressure relief seat 907 can rotate on the pressure relief mounting shaft 909 through the pressure relief mounting cavity 908, and so that the sealing torsion spring 910 is stressed, thereby causing the pressure relief tank 901 to open and relieve pressure, thus realizing the function of auxiliary pressure relief again.

[0039] In summary, the working principle of the check valve device for controlling steam in a steam turbine provided by this embodiment of the invention is as follows: When the check valve body 1 is activated, the valve stem 5 drives the linkage push rod 6 to move. The linkage push rod 6 pushes the valve cover 4 to close the intake flange 2, which in turn drives the opening and closing slide shaft 715 to move. This causes the opening and closing slide shaft 715 to drive the opening and closing bracket 713 to rotate on the opening and closing seat 712. At the same time, the opening and closing slide shaft 715 slides in the opening and closing slide hole 714, causing the opening and closing bracket 713 to drive the backflush sleeve 701 to close the output flange 3. It should be noted that when steam backflow occurs, the two first backflow plates 703 are first blown to rotate, causing the first backflow plates 703 to rotate within the first mounting cavity 706 via the first mounting shaft 707, and causing the first backflow torsion spring 708 to be stressed, thereby providing a first-level buffer for the backflow steam. If the steam impact force is large, even impacting the second backflow plate 705, the second backflow plate 705 drives the second mounting shaft 710 to rotate within the second mounting cavity 709, and causing the second backflow torsion spring 711 to be stressed, further weakening the steam impact force. Furthermore, the labyrinthine channel formed by the first backflow plates 703 and the second backflow plates 705 further weakens the steam impact force, effectively preventing steam backflow. Furthermore, when the valve cover 4 is closed, the pressure relief pusher 904 can be pushed to move. The pressure relief pusher 904 drives the pressure relief plate 902 to slide on the pressure relief bracket 903, and causes the sealing spring 905 to be stressed, thereby causing the pressure relief plate 902 to open automatically, and thus the pressure relief tank 901 can be opened for use, providing additional pressure relief space. If the pressure is too high, the two pressure relief sealing plates 906 can also be pushed open, so that the pressure relief sealing plates 906 can rotate on the pressure relief tank 901 through the pressure relief seat 907. The pressure relief seat 907 can rotate on the pressure relief mounting shaft 909 through the pressure relief mounting cavity 908, and cause the sealing torsion spring 910 to be stressed, so that the pressure relief tank 901 can be opened to relieve pressure. Therefore, after the pressure relief is completed, the pressure relief sealing plate 906 can be closed by the rotational force of the sealing torsion spring 910. Furthermore, when the valve cover 4 is opened, it is blown open by steam, causing the valve cover 4 to rotate the cleaning mounting sleeve 804. This, in turn, causes the cleaning mounting sleeve 804 to rotate the extrusion drive frame 807. The extrusion drive frame 807 is pressed against the inner wall of the check valve body 1, causing it to retract and the return spring 810 to contract under force. Simultaneously, the movement of the extrusion drive frame 807 moves the extrusion push block 809. The extrusion push block 809 moves within the drive groove 808, thereby pushing the drive sleeve 806 to rotate. The rotation of the drive sleeve 806, through the adapter rod 805, drives the swing scraper 801 to rotate. The cleaning of valve cover 4 prevents impurities from adhering to its surface, which could affect its sealing or cause corrosion. Similarly, when valve cover 4 is closed, and the extrusion drive frame 807 is no longer being extruded, the swing scraper 801 rotates and resets to clean valve cover 4 again. At the same time, when valve cover 4 is closed, steam impacts valve cover 4, causing the buffer sealing plate 802 to be impacted, which in turn drives multiple buffer springs 803 to be stressed. Under the rebound force of multiple buffer springs 803, the buffer sealing plate 802 can maintain a seal against the air inlet flange 2, avoiding the "water hammer" effect from affecting the seal of valve cover 4.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A check valve device for controlling steam in a steam turbine, characterized in that, It includes a check valve body, with an inlet flange and an outlet flange on both sides of the check valve body. A valve cover and a valve stem are installed inside the check valve body. A linkage push rod is installed on the valve stem. The valve stem pushes the linkage push rod to move, thereby pushing the valve cover to close. It also includes a labyrinth anti-reverse mechanism, which is installed in the check valve body and is used to buffer the backflow gas; the labyrinth anti-reverse mechanism includes a backflow sleeve, which is installed on the output flange, and two first backflow plates and two second backflow plates are rotatably mounted on the backflow sleeve; It also includes a cover buffer protection mechanism, which is installed on the valve cover and is used to actively clean the valve cover; The cover buffer protection mechanism includes a swinging scraper, which is rotatably mounted on one side of the valve cover. The swinging scraper is used to swing and clean the valve cover. A cleaning mounting sleeve is installed on the other side of the valve cover. A connecting rod is rotatably mounted inside the cleaning mounting sleeve. The swinging scraper is mounted on the connecting rod. A squeezing drive frame is slidably mounted inside the cleaning mounting sleeve. The squeezing drive frame is connected to the connecting rod in a transmission manner.

2. A check valve device for controlling steam in a steam turbine according to claim 1, characterized in that, The maze anti-reverse mechanism also includes an opening and closing bracket, which is installed on the backflow sleeve. An opening and closing seat is installed on the top inner wall of the check valve body, and the opening and closing bracket is rotatably installed on the opening and closing seat. The opening and closing bracket is provided with an opening and closing sliding hole, and the linkage push rod is equipped with an opening and closing sliding shaft, which is slidably installed in the opening and closing sliding hole.

3. A check valve device for controlling steam in a steam turbine according to claim 2, characterized in that, The recoil sleeve is equipped with a recoil bracket, and both first recoil plates are rotatably mounted on the recoil bracket. The first recoil plate has a first mounting cavity, and a first mounting shaft is rotatably mounted in the first mounting cavity. The first mounting shaft is mounted on the recoil bracket. A first recoil torsion spring is mounted on the first mounting shaft, and the first recoil torsion spring is mounted on the inner wall of the first mounting cavity.

4. A check valve device for controlling steam in a steam turbine according to claim 3, characterized in that, Two recoil seats are installed on the recoil sleeve, and two second recoil plates are rotatably installed on the two recoil seats respectively. The recoil seat is provided with a second mounting cavity, and a second mounting shaft is rotatably mounted in the second mounting cavity. The second recoil plate is mounted on the second mounting shaft. A second recoil torsion spring is mounted on the second mounting shaft, and the second recoil torsion spring is mounted on the inner wall of the second mounting cavity.

5. A check valve device for controlling steam in a steam turbine according to claim 1, characterized in that, The cover buffer protection mechanism also includes a buffer sealing plate, which is movably installed inside the valve cover; Multiple buffer springs are installed on one side of the buffer sealing plate, and all of the buffer springs are installed on the valve cover.

6. A check valve device for controlling steam in a steam turbine according to claim 5, characterized in that, A drive sleeve is fitted onto the adapter rod, and a drive groove is provided on the outer surface of the drive sleeve at an annular angle. An extrusion pusher is mounted on the extrusion drive frame, and the extrusion pusher is movably mounted in the drive groove.

7. A check valve device for controlling steam in a steam turbine according to claim 6, characterized in that, A return spring is installed on one side of the extrusion drive frame, and the return spring is installed on the inner wall of the cleaning mounting sleeve.

8. A check valve device for controlling steam in a steam turbine according to claim 1, characterized in that, It also includes an active pressure relief mechanism, which is installed on the bottom side of the check valve body and is used to expand the pressure relief space. The active pressure relief mechanism includes a pressure relief tank, which is installed on the bottom side of the check valve body, and a pressure relief plate is movably installed inside the pressure relief tank.

9. A check valve device for controlling steam in a steam turbine according to claim 8, characterized in that, A pressure relief bracket is installed on the bottom inner wall of the pressure relief tank, the pressure relief plate is movably installed on the pressure relief bracket, and a pressure relief pusher is installed on the pressure relief plate; A sealing spring is installed on the inner wall of the pressure relief plate, and the sealing spring is mounted on the pressure relief bracket.

10. A check valve device for controlling steam in a steam turbine according to claim 9, characterized in that, Two pressure relief sealing plates are rotatably installed on the bottom side of the pressure relief tank. The pressure relief sealing plates are rotatably opened to release pressure. A pressure relief seat is installed on the pressure relief sealing plate. The pressure relief seat is rotatably installed on the bottom side of the pressure relief tank. A pressure relief mounting cavity is opened on the pressure relief seat. A pressure relief mounting shaft is rotatably installed in the pressure relief mounting cavity. The pressure relief mounting shaft is installed on the pressure relief tank. A sealing torsion spring is installed on the pressure relief mounting shaft. The sealing torsion spring is installed on the inner wall of the pressure relief mounting cavity.

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