High pressure regulating valve for steam turbine

Abstract

The application discloses a high-pressure regulating valve for a steam turbine and relates to the field of high-pressure regulating valves.The high-pressure regulating valve comprises a regulating valve body and a switching filter device, the switching filter device is installed on one side of the regulating valve body, and the switching filter device is used for filtering steam entering the regulating valve body.The switching filter device comprises a switching filter box.It is to be noted that in the application, when the filter screen is blocked after long-term use, the switching shaft drives the switching turntable to rotate, and then the switching turntable drives another filter screen to enter the sealing cover, at this time, the steam can smoothly pass through the new filter screen, automatic switching of the filter screen is realized, and the continuous air intake of the regulating valve body is ensured.In addition, when the blocked filter screen is moved to the bottom side of the switching filter box, the filter screen can be automatically discharged, and when the filter screen is not replaced in time, the switching turntable without the filter screen can be rotated into the sealing cover, and the uninterrupted air intake of the regulating valve body is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-pressure regulating valve technology, and more particularly to a high-pressure regulating valve for steam turbines. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto blades, causing a rotor equipped with rows of blades to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems. During operation, steam turbines utilize multiple valves, among which the high-pressure regulating valve, which regulates the steam, plays a crucial role.

[0003] It should be noted that during the steam transport process in the pipeline, impurities present in the pipeline itself, or welding slag falling off due to long-term use, or rust forming due to rust, can directly enter the high-pressure regulating valve during steam transport. This can damage the internal parts of the high-pressure regulating valve or cause it to jam, resulting in problems such as poor sealing or even damage to the high-pressure regulating valve. In addition, even though there are existing technologies that include adding a filter screen inside the high-pressure regulating valve, the filter screen is fixed and is prone to clogging over long-term use, leading to problems with poor air intake. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure regulating valve for steam turbines 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 high-pressure regulating valve for a steam turbine includes a regulating valve body and a switching filter device. The switching filter device is installed on one side of the regulating valve body and is used to filter steam entering the regulating valve body. The switching filter device includes a transfer filter box, which is installed on the regulating valve body. The transfer filter box contains multiple filter screens, and a switching shaft is rotatably installed inside the transfer filter box. A switching disc is installed on the switching shaft, and the multiple filter screens are movably installed on the switching disc.

[0007] It also includes an automatic switching device, which is installed on the switching filter device. The automatic switching device rotates to switch between multiple filters. The automatic switching device includes a switching crossbar, which is installed on the switching shaft. A switching push rod is slidably installed on the adapter filter box. A toggle push rod is rotatably installed on the switching push rod. The switching push rod drives the toggle push rod to move and drive the switching crossbar to rotate, thereby driving the switching turntable to rotate and switch between multiple filters.

[0008] The switching filter device is equipped with an automatic discharge device for discharging the filter screen. The automatic discharge device includes a closing plate, and a discharge groove is provided on the bottom side of the transfer filter box. An installation groove is provided on the inner wall of the discharge groove, and the closing plate is rotatably installed in the installation groove.

[0009] Furthermore, in a preferred embodiment of the present invention, the switching filter device further includes a plurality of filter frames, wherein the plurality of filter screens are respectively installed in the plurality of filter frames;

[0010] The switching turntable has multiple insertion slots arranged in a ring at equal intervals, and the multiple filter frames are respectively inserted into the multiple insertion slots.

[0011] Furthermore, in a preferred embodiment of the present invention, a retaining frame is movably installed in each of the plurality of insertion slots, and the retaining frame abuts the filter screen frame against the inner wall of the insertion slot;

[0012] A retaining frame is movably installed in the insertion slot. The retaining frame is mounted on the retaining frame, and a retaining spring is installed on the retaining frame. The retaining spring is installed on the inner wall of the insertion slot.

[0013] A flexible sleeve is installed on the clamping frame, and the flexible sleeve is installed on the inner wall of the insertion slot.

[0014] Furthermore, in a preferred embodiment of the present invention, a switching rotating hole is provided on the inner wall of the transfer filter box, and the switching rotating shaft is rotatably installed in the switching rotating hole;

[0015] The switching shaft is provided with multiple mounting grooves at equal intervals around its perimeter. The number of mounting grooves corresponds to the number of filter screens. Positioning spring rods are slidably installed in the mounting grooves. Multiple switching slots are provided at equal intervals around the inner wall of the switching hole. The multiple positioning spring rods are respectively locked in the multiple switching slots.

[0016] A positioning spring is installed on the inner wall of the switching slot, and the positioning spring is mounted on the positioning spring rod.

[0017] Furthermore, in a preferred embodiment of the present invention, two sealing covers are installed on the inner wall of the transfer filter box, and the switching turntable is in close contact with the two sealing covers.

[0018] Furthermore, in a preferred embodiment of the present invention, the automatic switching device further includes two translation pushers, both of which are slidably mounted on the transfer filter box, and a retraction spring is installed between the translation pushers and the transfer filter box;

[0019] The two translation pushers are equipped with push circular frames, which are correspondingly arranged with the plurality of filter screens.

[0020] Furthermore, in a preferred embodiment of the present invention, a limiting frame is installed on the transfer filter box, a horizontal pushing limiting rod is installed on the switching push rod, the horizontal pushing limiting rod is slidably installed in the limiting frame, and a pull-back spring is installed between the limiting frame and the horizontal pushing limiting rod;

[0021] Two adapter push-pull rods are rotatably mounted on the switching push rod. The adapter push-pull rods are rotatably mounted on one of the translation push frames. Two adapter push-pull shafts are rotatably mounted on the adapter push-pull rods. The two adapter push-pull shafts are respectively mounted on the switching push rod and the adapter push-pull rod.

[0022] Furthermore, in a preferred embodiment of the present invention, a forward blocking frame is installed on the switching push rod, and the toggle push rod is rotatably installed inside the forward blocking frame;

[0023] The push rod has a rotary cavity, and a rotary shaft is rotatably installed inside the rotary cavity. The rotary shaft is installed on the front push blocking frame, and a rotary torsion spring is installed on the inner wall of the rotary cavity. The rotary torsion spring is installed on the rotary shaft.

[0024] Furthermore, in a preferred embodiment of the present invention, the automatic discharge device further includes a closing pusher, a push-out groove is provided on one inner wall of the discharge groove, the closing pusher is slidably installed in the push-out groove, a closing bracket is installed on the closing plate, and the closing pusher is locked in the closing bracket;

[0025] An ejection spring is installed on the inner wall of the ejection groove, and the ejection spring is mounted on the closing pusher.

[0026] Furthermore, in a preferred embodiment of the present invention, a discharge mounting cavity is provided on the closing plate, and a discharge shaft is rotatably mounted in the discharge mounting cavity, the discharge shaft being mounted on the inner wall of the mounting groove;

[0027] A closing torsion spring is installed on the inner wall of the discharge mounting cavity, and the closing torsion spring is mounted on the discharge shaft.

[0028] The beneficial effects of the high-pressure regulating valve for steam turbines proposed in this invention are:

[0029] In this invention, by setting up a filter switching device, when the filter screen becomes clogged after long-term use, the switching shaft drives the switching disc to rotate, which in turn causes the switching disc to bring another filter screen into the sealing cover. At this time, steam can pass smoothly through the new filter screen, realizing automatic switching of the filter screen, thereby ensuring continuous air intake of the regulating valve body.

[0030] Furthermore, in this invention, by setting up an automatic switching device, when the filter screen becomes clogged after long-term use, the pressure of steam pushes the filter screen to move. The movement of the filter screen pushes the clamping frame to move through the filter screen frame, which in turn moves the clamping frame. The movement of the clamping frame then drives the circular frame to move, causing the circular frame to move two translational pushers. The movement of the translational pushers drives the switching push rod to move through the connecting push-pull rod, causing the switching push rod to move within the limiting frame through the horizontal push limiting rod, and causing the return spring to stretch. The movement of the switching push rod drives the switching cross to rotate through the push rod, and the rotation of the switching cross drives the switching turntable to rotate through the switching shaft. This achieves the purpose of automatically triggering the switching turntable when the filter screen is clogged, eliminating the need for manual operation and enabling automatic replacement of the filter screen.

[0031] Furthermore, in this invention, by setting up an automatic discharge device, when the clogged filter screen moves to the bottom of the transfer filter box, the weight of the clogged filter screen increases, which in turn causes the filter screen frame to press and move the closing pusher, causing the closing pusher to disengage from the closing bracket. At this time, the closing plate unlocks, which in turn causes the filter screen frame to press and rotate the closing plate, thereby realizing the automatic discharge of the filter screen. In addition, when the filter screen is not replaced in time, the switching turntable without the filter screen can rotate into the sealing cover, ensuring uninterrupted air intake of the regulating valve body. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural schematic diagram of a high-pressure regulating valve for a steam turbine provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram showing the connection between a switching filter device and an automatic switching device for a high-pressure regulating valve used in a steam turbine, as provided in an embodiment of the present invention.

[0034] Figure 3 This invention provides a schematic diagram of the connection between the switching turntable and the sealing cover of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the invention.

[0035] Figure 4 This invention provides a schematic diagram of the connection between the transfer filter box and the switching cross and other structures of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the invention.

[0036] Figure 5 This is a partial cross-sectional view of the connection between the transfer filter box and the switching shaft of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the present invention.

[0037] Figure 6 This is a partial cross-sectional view of the connection between the filter screen frame and the clamping frame of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the present invention.

[0038] Figure 7 This is a partial structural diagram illustrating the connection between the switching push rod and the transverse push limiting rod of a high-pressure regulating valve for a steam turbine, provided in an embodiment of the present invention.

[0039] Figure 8 This is a partial cross-sectional view of the connection between the switching push rod and the actuating push rod of a high-pressure regulating valve for a steam turbine, provided in an embodiment of the present invention.

[0040] Figure 9 This invention provides a high-pressure regulating valve for a steam turbine. Figure 7 A schematic diagram of the structure of part A in the middle;

[0041] Figure 10 This is a partial cross-sectional view of the connection between the closing plate and the closing pusher of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the present invention.

[0042] Figure 11 This is a partial structural diagram illustrating the connection between the transfer filter box and the shut-off plate of a high-pressure regulating valve for a steam turbine, provided in an embodiment of the present invention.

[0043] Figure 12 This is a partial cross-sectional view of the connection between the horizontal push limit rod and the limit frame of a high-pressure regulating valve for a steam turbine, as provided in an embodiment of the present invention.

[0044] In the diagram: 1-Regulating valve body; 2-Switching filter device; 201-Transfer filter box; 202-Filter screen; 203-Switching turntable; 204-Insert slot; 205-Filter screen frame; 206-Clamping frame; 207-Clamping bracket; 208-Clamping spring; 209-Flexible sleeve; 210-Switching shaft; 211-Switching rotating hole; 212-Mounting slide; 213-Positioning spring; 214-Switching slot; 215-Positioning spring; 216-Sealing cover; 3-Automatic switching device; 301-Switching cross; 302-Switching push rod; 303-Toggle push rod; 304-Horizontal 305 - Limiting rod; 306 - Pull-back spring; 307 - Pushing round frame; 308 - Translation push frame; 309 - Retraction spring; 310 - Adapter push-pull rod; 311 - Adapter push-pull shaft; 312 - Forward push blocking frame; 313 - Rotation cavity; 314 - Rotation shaft; 315 - Rotation torsion spring; 4 - Automatic discharge device; 401 - Closing plate; 402 - Discharge groove; 403 - Mounting groove; 404 - Discharge mounting cavity; 405 - Discharge rotating shaft; 406 - Closing torsion spring; 407 - Closing push frame; 408 - Closing bracket; 409 - Push-out groove; 410 - Push-out spring. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Please refer to the attached instruction manual. Figures 1-6 This invention provides a high-pressure regulating valve for a steam turbine, comprising a regulating valve body 1 and a switching filter device 2. The switching filter device 2 is installed on one side of the regulating valve body 1 and is used to filter the steam entering the regulating valve body 1. The switching filter device 2 includes a transfer filter box 201, which is installed on the regulating valve body 1. Multiple filter screens 202 are provided inside the transfer filter box 201. A switching shaft 210 is rotatably installed inside the transfer filter box 201, and a switching disc 203 is installed on the switching shaft 210. All filter screens 202 are movably installed on the switching disc 203. It should be noted that, in this embodiment of the invention, when a filter screen 202 becomes clogged after long-term use, the switching disc 203 causes another filter screen 202 to enter the sealing cover 216, achieving automatic switching of the filter screens 202 and thus ensuring continuous air intake of the regulating valve body 1.

[0052] Further, please refer to the appendix to the instruction manual. Figure 4 and Figures 7-9The present invention provides a high-pressure regulating valve for a steam turbine, which further includes an automatic switching device 3. The automatic switching device 3 is installed on the switching filter device 2. The automatic switching device 3 rotates to switch multiple filter screens 202. Specifically, the automatic switching device 3 includes a switching crossbar 301, which is installed on a switching shaft 210. A switching push rod 302 is slidably installed on the filter box 201. A toggle push rod 303 is rotatably installed on the switching push rod 302. The switching push rod 302 drives the toggle push rod 303 to move and drive the switching crossbar 301 to rotate, thereby driving the switching turntable 203 to rotate and switch multiple filter screens 202. It should be noted that, in this embodiment of the invention, when the filter screen 202 becomes clogged after long-term use, the pusher circular frame 307 causes the two translation pushers 308 to move. The translation pushers 308 drive the switching pusher 302 to move via the adapter push-pull rod 310. The movement of the switching pusher 302 drives the switching cross 301 to rotate via the toggle pusher 303. The rotation of the switching cross 301 drives the switching turntable 203 to rotate via the switching shaft 210, thereby achieving the purpose of automatically triggering the filter screen 202 to switch when clogged.

[0053] More specifically, in this embodiment of the invention, an automatic discharge device 4 is installed on the switching filter device 2. The automatic discharge device 4 is used to discharge the filter screen 202. The automatic discharge device 4 includes a closing plate 401, a discharge groove 402 is provided on the bottom side of the transfer filter box 201, and an installation groove 403 is provided on the inner wall of the discharge groove 402. The closing plate 401 is rotatably installed in the installation groove 403. It should be noted that in this embodiment of the invention, when the clogged filter screen 202 moves to the bottom side of the transfer filter box 201, the closing plate 401 rotates open, thereby allowing the clogged filter screen 202 to be discharged in time. This means that when the filter screen 202 is not replaced in time, the switching turntable 203 without the filter screen 202 can rotate into the sealing cover 216, ensuring uninterrupted air intake of the regulating valve body 1.

[0054] Please refer to the instruction manual attached. Figures 2-6 Furthermore, the high-pressure regulating valve for a steam turbine provided in this embodiment of the invention includes a switching filter device 2 that further includes multiple filter frames 205, with multiple filter screens 202 respectively installed in the multiple filter frames 205;

[0055] Furthermore, the switching turntable 203 has multiple insertion slots 204 arranged in a ring at equal intervals, and multiple filter screen holders 205 are respectively inserted into the multiple insertion slots 204. It should be noted that, in this embodiment of the invention, the filter screen 202 is secured in the insertion slot 204 by the filter screen holder 205, making it easy to discharge and replace the filter screen 202.

[0056] More specifically, in this embodiment of the invention, a retaining frame 206 is movably installed in each of the multiple insertion slots 204, and the retaining frame 206 abuts the filter screen frame 205 against the inner wall of the insertion slot 204; a retaining bracket 207 is movably installed in the insertion slot 204, the retaining bracket 207 is installed on the retaining frame 206, and a retaining spring 208 is installed on the retaining frame 206, and the retaining spring 208 is installed on the inner wall of the insertion slot 204;

[0057] A flexible sleeve 209 is installed on the clamping frame 206, and the flexible sleeve 209 is installed on the inner wall of the insertion slot 204. It should be noted that in this embodiment of the invention, when the filter screen 202 is clogged after long-term use, steam cannot pass through the filter screen 202. The filter screen 202 is sealed by the sealing cover 216. Therefore, under the pressure of steam, only the filter screen 202 and the filter screen frame 205 can be moved. The movement of the filter screen 202 pushes the clamping frame 206 to move through the filter screen frame 205. The clamping frame 206 drives the clamping bracket 207 to move, and causes the clamping spring 208 to be stressed. Therefore, under the rebound force of the clamping spring 208, the filter screen frame 205 can be locked onto the switching turntable 203.

[0058] Please continue to refer to the instruction manual appendix. Figures 2-6 More specifically, in this embodiment of the invention, a switching rotating hole 211 is provided on the inner wall of the transfer filter box 201, and a switching rotating shaft 210 is rotatably installed in the switching rotating hole 211; a plurality of mounting grooves 212 are provided equidistantly around the switching rotating shaft 210, the number of mounting grooves 212 is set in accordance with the number of filter screens 202, a positioning spring rod 213 is slidably installed in the mounting groove 212, and a plurality of switching slots 214 are provided equidistantly around the inner wall of the switching rotating hole 211, and the plurality of positioning spring rods 213 are respectively locked in the plurality of switching slots 214;

[0059] Furthermore, a positioning spring 215 is installed on the inner wall of the switching slot 214, and the positioning spring 215 is mounted on the positioning spring rod 213. It should be noted that, in this embodiment of the invention, the switching shaft 210 rotates within the switching hole 211, driving multiple positioning spring rods 213 to rotate simultaneously. The multiple positioning spring rods 213 are squeezed by the multiple switching slots 214, and then retract into the multiple mounting grooves 212, while simultaneously causing the multiple positioning springs 215 to be stressed. After the filter screen 202 is switched, under the rebound force of the multiple positioning springs 215, the multiple positioning spring rods 213 are locked in the multiple switching slots 214, thereby fixing the position of the switching shaft 210 and realizing the automatic fixing of the filter screen 202.

[0060] More specifically, in this embodiment of the invention, two sealing covers 216 are installed on the inner wall of the transfer filter box 201, and the switching turntable 203 is in close contact with the two sealing covers 216. It should be noted that, in this embodiment of the invention, the sealing covers 216 are used to seal the filter screen 202.

[0061] Please refer to the instruction manual attached. Figure 4 and Figures 7-9 as well as Figure 12 Furthermore, the high-pressure regulating valve for a steam turbine provided in this embodiment of the invention, the automatic switching device 3 further includes two translation pushers 308, both of which are slidably mounted on the transfer filter box 201, and a retraction spring 309 is installed between the translation pushers 308 and the transfer filter box 201.

[0062] Furthermore, a pushing circular frame 307 is installed on each of the two translational pushers 308, and the pushing circular frame 307 is correspondingly arranged with multiple filter screens 202. It should be noted that in this embodiment of the invention, when the filter screen 202 becomes clogged after long-term use, steam cannot pass through the filter screen 202. Since the filter screen 202 is sealed by the sealing cover 216, under the pressure of the steam, only the filter screen 202 and the filter screen frame 205 can be moved. The movement of the filter screen 202 pushes the pressing frame 206 to move through the filter screen frame 205. The pressing frame 206 drives the pressing frame 207 to move, which in turn forces the pressing spring 208. The movement of the pressing frame 207 drives the pushing circular frame 307 to move, which in turn drives the two translational pushers 308 to move. The movement of the translational pushers 308 causes the return spring 309 to be stretched, thereby realizing the automatic switching of the filter screen 202.

[0063] More specifically, in this embodiment of the invention, a limiting frame 305 is installed on the transfer filter box 201, a horizontal pushing limiting rod 304 is installed on the switching push rod 302, the horizontal pushing limiting rod 304 is slidably installed in the limiting frame 305, and a pull-back spring 306 is installed between the limiting frame 305 and the horizontal pushing limiting rod 304.

[0064] In addition, two adapter push-pull rods 310 are rotatably mounted on the switching push rod 302. The adapter push-pull rods 310 are rotatably mounted on a translation push frame 308. Two adapter push-pull shafts 311 are rotatably mounted on the adapter push-pull rods 310. The two adapter push-pull shafts 311 are respectively mounted on the switching push rod 302 and the adapter push-pull rod 310. It should be noted that, in this embodiment of the invention, when the circular frame 307 is pushed, it drives two translational pushers 308 to move. The movement of the translational pushers 308 drives the translational pusher rod 310 to move via a transition push-pull shaft 311. The movement of the transition pusher rod 310 drives the switching pusher rod 302 to move via another transition push-pull shaft 311. This causes the switching pusher rod 302 to move within the limiting frame 305 via the horizontal push limiting rod 304, and causes the return spring 306 to stretch. The movement of the switching pusher rod 302 drives the switching cross 301 to rotate via the toggle pusher rod 303. The rotation of the switching cross 301 drives the switching turntable 203 to rotate via the switching rotating shaft 210, thereby realizing the automatic rotation of the switching rotating shaft 210.

[0065] More specifically, in this embodiment of the invention, a forward blocking frame 312 is installed on the switching push rod 302, and a toggle push rod 303 is rotatably installed inside the forward blocking frame 312; a rotary cavity 313 is opened on the toggle push rod 303, and a rotary shaft 314 is rotatably installed inside the rotary cavity 313. The rotary shaft 314 is installed on the forward blocking frame 312, and a rotary torsion spring 315 is installed on the inner wall of the rotary cavity 313. The rotary torsion spring 315 is installed on the rotary shaft 314. It should be noted that, in this embodiment of the invention, when the push rod 303 is reset, the push rod 303 is driven to rotate by the switching cross 301, which causes the push rod 303 to rotate on the rotating shaft 314 through the rotating cavity 313, and causes the rotating torsion spring 315 to be stressed. Therefore, when the push rod 303 disengages from the switching cross 301, the push rod 303 is automatically reset under the rebound force of the rotating torsion spring 315.

[0066] Please refer to the instruction manual attached. Figure 4 and Figures 10-11 Furthermore, the high-pressure regulating valve for a steam turbine provided in this embodiment of the invention, the automatic discharge device 4 further includes a closing pusher 407, a push-out groove 409 is provided on one side inner wall of the discharge groove 402, the closing pusher 407 is slidably installed in the push-out groove 409, a closing bracket 408 is installed on the closing plate 401, and the closing pusher 407 is locked in the closing bracket 408;

[0067] Furthermore, an ejection spring 410 is installed on the inner wall of the ejection groove 409, and the ejection spring 410 is mounted on the closing push bracket 407. It should be noted that, in this embodiment of the invention, when the clogged filter screen 202 moves to the bottom of the transfer filter box 201, the weight of the clogged filter screen 202 increases, which causes the filter screen frame 205 to press the closing push bracket 407 to move. The closing push bracket 407 slides horizontally in the ejection groove 409, while simultaneously pressing the ejection spring 410, causing the closing push bracket 407 to disengage from the closing bracket 408, thereby automatically unlocking the closing plate 401.

[0068] More specifically, in this embodiment of the invention, a discharge mounting cavity 404 is provided on the closing plate 401, and a discharge shaft 405 is rotatably mounted in the discharge mounting cavity 404. The discharge shaft 405 is mounted on the inner wall of the mounting groove 403. In addition, a closing torsion spring 406 is installed on the inner wall of the discharge mounting cavity 404, and the closing torsion spring 406 is mounted on the discharge shaft 405. It should be noted that in this embodiment of the invention, when the filter frame 205 falls due to gravity, it squeezes the closing plate 401 to rotate. The closing plate 401 rotates on the discharge shaft 405 through the discharge mounting cavity 404, causing the closing torsion spring 406 to be stressed. Therefore, when the filter frame 205 disengages from the transfer filter box 201, the rotational force of the closing torsion spring 406 causes the closing plate 401 to close the transfer filter box 201, realizing the automatic opening and closing of the closing plate 401.

[0069] In summary, the working principle of the high-pressure regulating valve for steam turbines provided in this embodiment of the invention is as follows:

[0070] When the regulating valve body 1 is in use, steam enters the transfer filter box 201 and is sealed by two sealing covers 216. Then, impurities in the steam are filtered through the filter screen 202. It should be noted that when the filter screen 202 becomes clogged after long-term use, steam cannot pass through it. Since the filter screen 202 is sealed by the sealing covers 216, under the pressure of the steam, only the filter screen 202 and the filter screen frame 205 can move. The movement of the filter screen 202 pushes the clamping frame 206 to move through the filter screen frame 205. The clamping frame 206 drives the clamping bracket 207 to move, which in turn forces the clamping spring 208. The movement of the clamping bracket 207 drives the pushing circular frame 307 to move, which in turn drives the two translational pushers 308 to move. The movement of the translational pushers 308 forces the return spring 309 to stretch, causing the translational pushers 308 to move further. The movement of the valve body 1 is achieved by a transition push-pull shaft 311 driving the transition push-pull rod 310 to move. The movement of the transition push-pull rod 310 drives the switching push rod 302 to move via another transition push-pull shaft 311. This causes the switching push rod 302 to move within the limit frame 305 via the horizontal push limit rod 304, and causes the return spring 306 to stretch. The movement of the switching push rod 302 drives the switching cross 301 to rotate via the toggle push rod 303. The rotation of the switching cross 301 drives the switching turntable 203 to rotate via the switching shaft 210. This causes the switching turntable 203 to drive another filter screen 202 into the sealing cover 216, thereby achieving automatic switching of the filter screen 202 and ensuring continuous air intake of the regulating valve body 1.

[0071] Furthermore, the switching shaft 210 rotates within the switching hole 211, causing multiple positioning springs 213 to rotate simultaneously. These springs 213 are pressed by multiple switching slots 214, retracting into multiple mounting grooves 212, while simultaneously applying force to multiple positioning springs 215. After the filter screen 202 is switched, the rebound force of the multiple positioning springs 215 causes the multiple positioning springs 213 to engage within the multiple switching slots 214, thus fixing the position of the switching shaft 210 and achieving automatic fixing of the filter screen 202. Additionally, when the adapter filter box 201 is ventilated, the pushing circular frame 307 is no longer... The compression causes the switching push rod 302 to drive the toggle push rod 303 to reset. At this time, the toggle push rod 303 is driven to rotate by the switching cross 301, causing the toggle push rod 303 to rotate on the rotating shaft 314 through the rotating cavity 313, and causing the rotating torsion spring 315 to be stressed. Therefore, when the toggle push rod 303 disengages from the switching cross 301, the toggle push rod 303 is reset under the rebound force of the rotating torsion spring 315. Then, when the toggle push rod 303 pushes the switching cross 301 again, it is blocked by the forward blocking frame 312. Thus, by means of hard blocking, it is ensured that the switching cross 301 can be pushed by the toggle push rod 303.

[0072] Furthermore, when the clogged filter screen 202 moves to the bottom of the transfer filter box 201, the increased gravity of the clogged filter screen 202 causes the filter screen frame 205 to press against the closing pusher 407 and move it. The closing pusher 407 slides horizontally within the ejection groove 409, simultaneously pressing the ejection spring 410, causing the closing pusher 407 to disengage from the closing bracket 408. At this point, the closing plate 401 unlocks, causing the filter screen frame 205 to press against the closing plate 401 and rotate, closing... The closing plate 401 rotates on the discharge shaft 405 through the discharge mounting cavity 404, which causes the closing torsion spring 406 to be stressed. Therefore, when the filter screen frame 205 is disengaged from the transfer filter box 201, the rotational force of the closing torsion spring 406 causes the closing plate 401 to close the transfer filter box 201. This allows the switching turntable 203 without the filter screen 202 to rotate into the sealing cover 216 when the filter screen 202 is not replaced in time, ensuring uninterrupted air intake of the regulating valve body 1.

[0073] 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 high-pressure control valve for a steam turbine, characterized by comprising: The utility model relates to a steam regulating valve with automatic switching and discharging functions, which comprises a regulating valve body and a switching filter device installed on one side of the regulating valve body for filtering steam entering the regulating valve body. The switching filter device comprises a switching filter box installed on the regulating valve body, a plurality of filter screens arranged in the switching filter box, a switching shaft rotatably installed in the switching filter box, and a switching disc installed on the switching shaft. The switching filter device further comprises an automatic switching device installed on the switching filter device for switching the filter screens. The automatic switching device comprises a switching cross installed on the switching shaft, a switching push rod slidingly installed on the switching filter box, a push rod rotatably installed on the switching push rod, and a switching disc rotatably installed on the switching push rod. The switching push rod drives the push rod to move, thereby driving the switching cross to rotate and the switching disc to rotate, so as to switch the filter screens. The switching filter device further comprises an automatic discharging device installed on the switching filter device for discharging the filter screens. The automatic discharging device comprises a closing plate rotatably installed in an installation slot formed in the inner wall of a discharging groove formed in the bottom side of the switching filter box.

2. A high-pressure control valve for a steam turbine according to claim 1, characterized by The switching filter device further comprises a plurality of filter screen frames, and each of the filter screens is installed in a corresponding filter screen frame. Each of the insertion slots is movably provided with a pressing frame, and the pressing frame presses the filter screen frame against the inner wall of the insertion slot.

3. A high-pressure control valve for a steam turbine according to claim 2, characterized by The automatic switching device further comprises two translation push frames slidingly installed on the switching filter box. The switching push rod is rotatably provided with two switching push-pull rods, and each of the switching push-pull rods is rotatably installed on a corresponding translation push frame. The switching push-pull rod is rotatably provided with two switching push-pull shafts, and each of the switching push-pull shafts is installed on the switching push rod and the switching push-pull rod. The pressing frame is provided with a pressing spring installed on the inner wall of the insertion slot. The pressing frame is provided with a flexible sheath installed on the inner wall of the insertion slot. The inner wall of the switching filter box is provided with a switching rotating hole. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The inner wall of the switching rotating hole is annularly and equidistantly provided with a plurality of switching clamping grooves. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter screens. The switching shaft is annularly and equidistantly provided with a plurality of installation sliding grooves corresponding in number to the filter The inner wall of the switching card slot is provided with a positioning spring, which is installed on the positioning spring rod.

4. A high-pressure control valve for a steam turbine according to claim 3, characterized by The inner wall of the switching filter box is provided with two sealing covers, and the switching turntable is in close contact with the two sealing covers.

5. A high-pressure control valve for a steam turbine according to claim 1, wherein The translation push frame is provided between the translation push frame and the switching filter box.

6. A high-pressure control valve for a steam turbine according to claim 5, characterized by The switching filter box is provided with a limiting frame, the switching push rod is provided with a horizontal push limiting rod, the horizontal push limiting rod is slidingly installed in the limiting frame, and a back pulling spring is installed between the limiting frame and the horizontal push limiting rod.

7. A high-pressure control valve for a steam turbine according to claim 6, characterized by The switching push rod is provided with a front push blocking frame, and the rotating push rod is rotatably installed in the front push blocking frame. The rotating cavity is provided in the rotating push rod, a rotating shaft is rotatably installed in the rotating cavity, the rotating shaft is installed on the front push blocking frame, a rotating torsional spring is installed on the inner wall of the rotating cavity, and the rotating torsional spring is installed on the rotating shaft.

8. A high-pressure control valve for a steam turbine according to claim 1, wherein The automatic discharge device further comprises a closing push frame, a push-out sliding groove is formed in one side of the inner wall of the discharge slot, the closing push frame is slidingly installed in the push-out sliding groove, a closing clamping frame is installed on the closing plate, and the closing push frame is clamped in the closing clamping frame. The inner wall of the push-out sliding groove is provided with a push-out spring, and the push-out spring is installed on the closing push frame.

9. A high-pressure control valve for a steam turbine according to claim 8, characterized by The closing plate is provided with a discharge installation cavity, a discharge rotating shaft is rotatably installed in the discharge installation cavity, and the discharge rotating shaft is installed on the inner wall of the installation slot. The inner wall of the discharge installation cavity is provided with a closing torsional spring, and the closing torsional spring is installed on the discharge rotating shaft.

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