High-pressure main air valve casting of steam turbine

Abstract

The invention belongs to the technical field of steam turbine assemblies, and discloses a steam turbine high-pressure main air valve casting which comprises a quick-closing valve body and further comprises a filter screen cylinder rotationally arranged in the quick-closing valve body. The partition plate is fixedly arranged in the quick-closing valve body and divides the quick-closing valve body into a filtering cavity and a cleaning cavity; a containing hole is formed in the partition plate, the filter screen cylinder penetrates through the containing hole and forms a filter section located in the filter cavity, and a filter working surface is formed on the outer surface of the filter section; the cleaning section extends into the cleaning cavity; and the rotary transmission part drives the filter screen cylinder to rotate circumferentially in the cleaning cavity. The rotary transmission part synchronously drives the filter screen cylinder to circumferentially rotate and cooperates with the eccentric wheel and the guide rail sleeve to drive the brush plate to reciprocate, the dual functions of continuously intercepting impurities by the filter section and mechanically brushing the cleaning section in real time are achieved, impurity accumulation on the surface of the filter screen is effectively prevented, steam pressure drop is reduced, and the running efficiency of a steam turbine is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine components, and specifically relates to a high-pressure main steam valve casting for a steam turbine. Background Art

[0002] The high-pressure main steam valve of a steam turbine is a key component for controlling the on-off and flow rate of high-temperature and high-pressure steam. In addition, a cylindrical steam filter screen is provided inside the valve body of the main steam valve, and the built-in cylindrical filter screen is used to intercept impurities such as rust, welding slag, and sand particles in the steam to prevent foreign objects from entering the valve interior.

[0003] However, in the prior art, due to the long-term static filtration of the fixed filter screen, an impurity accumulation layer is easily formed, resulting in a reduction in the steam flow cross-sectional area and an increase in the pressure difference. This not only reduces the efficiency of the steam turbine but also increases the risk of filter screen corrosion and damage. In addition, traditional maintenance requires shutting down the machine to disassemble the filter screen for manual cleaning, which has problems such as cumbersome operation and unplanned shutdown. The existing filter screen cleaning solutions lack dynamic self-cleaning means and are difficult to meet the requirements of continuous and efficient operation of the unit.

[0004] Therefore, a high-pressure main steam valve casting for a steam turbine is proposed to solve the above problems. Summary of the Invention

[0005] To solve the problems raised in the above background art, the present invention provides a high-pressure main steam valve casting for a steam turbine.

[0006] To achieve the above object, the present invention provides the following technical solution: A high-pressure main steam valve casting for a steam turbine, including a quick-closing valve body, further including: A filter screen cylinder, rotatably arranged inside the quick-closing valve body; A partition plate, fixedly arranged inside the quick-closing valve body to divide it into a filtering chamber and a cleaning chamber; The partition plate is provided with a receiving hole, and the filter screen cylinder passes through the receiving hole and forms: a filtering section located in the filtering chamber, the outer surface of which forms a filtering working surface; and a cleaning section extending into the cleaning chamber; A rotary transmission member, driving the circumferential rotation of the filter screen cylinder in the cleaning chamber; An eccentric wheel, connected to the output end of the rotary transmission member; A brush plate, arranged parallel to the axis of the filter screen cylinder and in contact with the surface of the filter screen cylinder, and a transmission hole is opened at the end, and the eccentric wheel is located in the transmission hole; A guide rail sleeve, fixedly arranged in the cleaning chamber and slidably connected to the brush plate; As the rotary transmission member drives the circumferential rotation of the filter screen cylinder, the filtering section of the filter screen cylinder continuously intercepts fluid impurities, and at the same time, the eccentric wheel rotates circumferentially and then drives the brush plate to reciprocate under the constraint of the guide rail sleeve to clean the cleaning section of the filter screen cylinder.

[0007] In the above technical solution, preferably, the rotary transmission member includes: A driving motor is provided outside the quick - closing valve body; A speed reducer is connected to the output end of the driving motor; A rotating rod is connected to the output end of the speed reducer and one end thereof penetrates into the cleaning cavity of the quick - closing valve body; A gear is fixedly arranged at the penetrating end of the rotating rod; A toothed ring is connected to the filter screen cylinder and meshes with the gear; The eccentric wheel is fixedly arranged outside the rotating rod.

[0008] In the above - mentioned technical solution, preferably, it further includes: A sleeve is inserted into the partition board and has a hollow interior, and is located on one side of the filter screen cylinder; A rotating ring penetrates and rotates inside the sleeve, and is fixedly connected to the filter screen cylinder through a clamping rod; A toothed ring is arranged on the side of the rotating ring away from the filter screen cylinder, and one end of the rotating rod penetrates into the sleeve; An air - jet plate is located inside the filter screen cylinder and one end thereof penetrates into the sleeve; The air - jet plate is arranged parallel to the axis of the filter screen cylinder and the air outlet faces the filter screen cylinder; An air - guiding channel is communicated with the interior of the sleeve.

[0009] In the above - mentioned technical solution, preferably, it further includes: An air - guiding valve is communicated with the cleaning cavity; A first filter sleeve is arranged at the end of the air - guiding valve.

[0010] In the above - mentioned technical solution, preferably, the air - guiding channel includes: A diversion pipe is communicated with the inner cavity of the sleeve and the other end thereof penetrates through the quick - closing valve body; A check valve is arranged on the diversion pipe; A air - supply cylinder is used to guide the air flow into the diversion pipe.

[0011] In the above - mentioned technical solution, preferably, the air - supply cylinder includes: A cylinder is arranged outside the quick - closing valve body; Fan blades are arranged inside the cylinder; An air - intake sleeve is communicated with the cylinder and is located on the air - intake side of the fan blades; The end of the diversion pipe communicated with the cylinder is located on the air - supply side of the fan blades; The driving motor is a double - shaft motor, one output end is connected to the speed reducer, and the other output end is connected to the fan blades.

[0012] In the above - mentioned technical solution, preferably, a second filter sleeve is arranged at the end of the air - intake sleeve, an installation plate is arranged outside the quick - closing valve body, a magnet sheet is arranged on the installation plate, and a pull plate is arranged between the first filter sleeve and the second filter sleeve, and the pull plate is magnetically attracted to the magnet sheet.

[0013] In the above technical solution, preferably, the quick - closing valve body further includes an air inlet end, an air outlet end and a transmission end. A valve rod is provided at the output end of the transmission end. A valve plate for closing the air outlet end is provided at the end of the valve rod. The filter screen cylinder is located outside the valve plate. Both the valve rod and the valve plate are located in the filter cavity.

[0014] In the above technical solution, preferably, it further includes: A gas pressure sensor for detecting the gas pressure at the place where the gas enters the filter screen cylinder from the air inlet end and at the place where the gas enters the air outlet end after being filtered by the filter screen cylinder; An audible and visual alarm, electrically connected to the gas pressure sensor.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By synchronously driving the circumferential rotation of the filter screen cylinder through a rotating transmission member and driving the brush plate to reciprocate by cooperating with an eccentric wheel and a guide rail sleeve, the present invention realizes the dual functions of continuously intercepting impurities in the filtering section and mechanically brushing in real - time in the cleaning section, effectively preventing the accumulation of impurities on the surface of the filter screen, reducing the steam pressure drop, and ensuring the operation efficiency of the steam turbine.

[0016] And integrating a jet plate and a gas guiding flow channel, using the dual - shaft output of the driving motor to synchronously drive the fan blades to supply air, transporting the external air flow to the jet plate through a guiding pipe to form a reverse purging air flow, and realizing multi - dimensional cleaning in combination with the brushing of the brush plate, improving the impurity cleaning effect.

[0017] Cooperating with the design of a gas guiding valve, a check valve and a double - filter sleeve can realize the export of impurity air flow and the import of air flow, avoid the escape of impurities to the external environment and the intrusion of external pollutants into the cleaning cavity, and cooperate with the gas pressure sensor to monitor the change of the pressure difference on both sides of the filter screen in real - time, and combine with the audible and visual alarm to give an early warning of the filter screen blockage or abnormal cleaning state in time, effectively reducing the risk of secondary pollution and the probability of unplanned shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a partial cross - sectional structural diagram of the present invention; Figure 3 It is a three - dimensional structural diagram of another perspective of the present invention; Figure 4 It is a cross - sectional structural diagram of the quick - closing valve body of the present invention; Figure 5 It is a front - view cross - sectional structural diagram of the quick - closing valve body, partition plate, filter cavity, cleaning cavity and accommodation hole of the present invention; Figure 6 For Figure 4 An enlarged schematic diagram of part A shown; Figure 7Schematic cross-sectional structure diagram of the cylinder, fan blade, and air intake sleeve of the present invention; Figure 8 Schematic three-dimensional structure diagram of the filter screen cylinder, rotating ring, gear, and toothed ring of the present invention; Figure 9 Schematic three-dimensional structure diagram of the ring sleeve, jet plate, and diversion pipe of the present invention; Figure 10 Schematic three-dimensional structure diagram of the eccentric wheel, brush plate, transmission hole, and guide rail sleeve of the present invention; Figure 11 Schematic three-dimensional structure diagram of the air supply cylinder, air guide valve, first filter sleeve, and second filter sleeve of the present invention; Figure 12 Schematic three-dimensional structure diagram of the first filter sleeve, second filter sleeve, mounting plate, and pull plate of the present invention.

[0019] In the figure: 1. Quick-closing valve body; 2. Filter screen cylinder; 3. Partition board; 4. Filter cavity; 5. Cleaning cavity; 6. Accommodating hole; 7. Rotary transmission member; 71. Transmission motor; 72. Reducer; 73. Rotating rod; 74. Gear; 75. Toothed ring; 8. Eccentric wheel; 9. Brush plate; 10. Transmission hole; 11. Guide rail sleeve; 12. Ring sleeve; 13. Rotating ring; 14. Clamping rod; 15. Jet plate; 16. Air guide flow channel; 161. Diversion pipe; 162. Check valve; 163. Air supply cylinder; 1631. Cylinder; 1632. Fan blade; 1633. Air intake sleeve; 17. Air guide valve; 18. First filter sleeve; 19. Second filter sleeve; 20. Mounting plate; 21. Magnet sheet; 22. Air intake end; 23. Air outlet end; 24. Transmission end; 25. Valve rod; 26. Valve plate; 27. Gas pressure sensor; 28. Sound and light alarm; 29. Pull plate. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 10 shown, the present invention provides a high-pressure main steam valve casting for a steam turbine, including a quick-closing valve body 1, and further including: A filter screen cylinder 2, rotatably arranged inside the quick-closing valve body 1; A partition board 3, fixedly arranged inside the quick-closing valve body 1 to divide it into a filter cavity 4 and a cleaning cavity 5; The partition plate 3 is provided with a receiving hole 6, and the filter screen cylinder 2 passes through the receiving hole 6 and forms: a filtering section located in the filtering chamber 4, the outer surface of which forms a filtering working surface; and a cleaning section extending into the cleaning chamber 5; A rotary transmission member 7 drives the filter screen cylinder 2 to rotate circumferentially in the cleaning chamber 5; The filter screen cylinder 2 adopts a rotatable structure and rotates circumferentially under the drive of the rotary transmission member 7, so that the filtering working surface is continuously updated, effectively preventing the filter screen from being blocked; An eccentric wheel 8 is connected to the output end of the rotary transmission member 7; A brush plate 9 is arranged parallel to the axis of the filter screen cylinder 2 and is in contact with the surface of the filter screen cylinder 2, and a transmission hole 10 is opened at the end, and the eccentric wheel 8 is located in the transmission hole 10; Among them, as Figure 10 shown, the brush plate 9 is slidably connected to the inner side of the quick - closing valve body 1 through a limiting rod, which is used to improve the stability of the brush plate 9 when moving; A guide rail sleeve 11 is fixedly arranged in the cleaning chamber 5 and is slidably connected to the brush plate 9; As the rotary transmission member 7 drives the filter screen cylinder 2 to rotate circumferentially, the filtering section of the filter screen cylinder 2 continuously intercepts fluid impurities. At the same time, the eccentric wheel 8 rotates circumferentially and then drives the brush plate 9 to reciprocate under the constraint of the guide rail sleeve 11 to clean the cleaning section of the filter screen cylinder 2.

[0022] By synchronously driving the filter screen cylinder 2 to rotate circumferentially and the brush plate 9 to reciprocate by the rotary transmission member 7, the dual functions of the filtering section continuously intercepting impurities and the cleaning section being mechanically brushed in real - time are realized. The rotation of the filter screen cylinder 2 disperses the accumulation pressure of impurities and avoids local blockage; the linear reciprocating motion of the brush plate 9 under the constraint of the eccentric wheel 8 and the guide rail sleeve 11 ensures that the impurities on the surface of the cleaning section are completely scraped off, significantly improving the permeability and service life of the filter screen.

[0023] As Figure 6 、 Figure 7 shown, the rotary transmission member 7 includes: A transmission motor 71 is arranged outside the quick - closing valve body 1; A speed reducer 72 is connected to the output end of the transmission motor 71; A rotating rod 73 is connected to the output end of the speed reducer 72 and one end thereof penetrates into the cleaning chamber 5 of the quick - closing valve body 1; A gear 74 is fixedly arranged at the penetrated end of the rotating rod 73; A toothed ring 75 is connected to the filter screen cylinder 2 and meshes with the gear 74; The eccentric wheel 8 is fixedly arranged outside the rotating rod 73.

[0024] The rotating rod 73 is driven to rotate by the driving motor 71 combined with the speed reducer 72. By using the meshing structure of the gear 74 and the toothed ring 75, the uniform circumferential rotation of the filter screen cylinder 2 is realized, ensuring the uniform dispersion of impurities in the filtering section. At the same time, the eccentric wheel 8 fixedly connected to the outside of the rotating rod 73 converts the same rotating power into the reciprocating linear motion of the brush plate 9, realizing the dual actions of filtering and cleaning driven by a single power source, greatly reducing energy consumption and improving transmission synchronism.

[0025] As Figure 3 , Figure 6 , Figure 8 , Figure 9 shown, it further includes: The sleeve 12 is inserted into the partition plate 3 and is hollow inside, and is located on one side of the filter screen cylinder 2; The rotating ring 13 is rotatably arranged through the sleeve 12 and is fixedly connected to the filter screen cylinder 2 through the clamping rod 14; A toothed ring 75 is provided on the side of the rotating ring 13 away from the filter screen cylinder 2, and one end of the rotating rod 73 penetrates into the sleeve 12; The air jet plate 15 is located inside the filter screen cylinder 2 and one end penetrates into the sleeve 12; The air jet plate 15 is arranged parallel to the axis of the filter screen cylinder 2 and the air outlet faces the filter screen cylinder 2; The air guide channel 16 is communicated with the inside of the sleeve 12.

[0026] Through the nested design of the sleeve 12 and the rotating ring 13, the dynamic seal during the rotation of the filter screen cylinder 2 is realized, preventing impurities in the cleaning cavity 5 from reversely infiltrating into the sleeve 12. The air jet plate 15 is arranged parallel to the axis of the filter screen cylinder 2, and the clean air flow introduced by the air guide channel 16 is directed to spray towards the inner side of the filter screen, forming a reverse purging effect, and forming a multi-dimensional cleaning with the mechanical scraping of the brush plate 9.

[0027] As shown in the figure, it further includes: The air guide valve 17 is communicated with the cleaning cavity 5; The first filter sleeve 18 is arranged at the end of the air guide valve 17.

[0028] It is communicated with the cleaning cavity 5 through the air guide valve 17, and the impurities stripped by mechanical brushing and air flow purging are directed out along with the air flow, avoiding the secondary deposition of impurities in the cleaning cavity; the first filter sleeve 18 is arranged at the end of the air guide valve 17 to filter the outgoing air flow, intercept the escaping particles, and prevent the external pipeline or environment from being polluted.

[0029] As Figure 11 shown, the air guide channel 16 includes: The diversion pipe 161 is communicated with the inner cavity of the sleeve 12 and the other end penetrates through the quick closing valve body 1; A check valve 162 is provided on the diversion pipe 161; The air supply pipe 163 is used to divert the air current into the diversion pipe 161.

[0030] As Figure 7 shown, the air supply pipe 163 includes: A cylinder 1631, which is arranged outside the quick - closing valve body 1; A fan blade 1632, which is arranged inside the cylinder 1631; An air inlet sleeve 1633, which is communicated with the cylinder 1631 and is located on the air inlet side of the fan blade 1632; The connection end of the diversion pipe 161 and the cylinder 1631 is located on the air supply side of the fan blade 1632; The drive motor 71 is a double - shaft motor. One output end is connected to the speed reducer 72, and the other output end is connected to the fan blade 1632.

[0031] By synchronously driving the rotation of the filter screen cylinder 2 and the air supply of the fan blade 1632 through the double - shaft drive motor 71, the self - supply of clean air flow and power coordination are realized. The fan blade 1632 sucks in and pressurizes the external air through the air inlet sleeve 1633, forms a stable air flow and transports it to the jet plate 15 through the diversion pipe 161. Combining with the check valve 162 to prevent the air flow from flowing back, ensuring the continuity and pressure stability of the reverse purge air flow, and at the same time reducing the configuration cost of additional air source equipment.

[0032] As Figure 3 、 Figure 12 shown, a second filter sleeve 19 is arranged at the end of the air inlet sleeve 1633. An installation plate 20 is arranged outside the quick - closing valve body 1. A magnet sheet 21 is arranged on the installation plate 20. A pull plate 29 is arranged between the first filter sleeve 18 and the second filter sleeve 19, and the pull plate 29 is magnetically attracted to the magnet sheet 21.

[0033] The magnetic - type pull plate 29 is quickly connected to the installation plate 20 through the magnet sheet 21. Combining the first filter sleeve 18 (air guide valve end) and the second filter sleeve 19 (air inlet sleeve end) forms a modular integrated structure, realizing the synchronous disassembly and assembly of the double - filter sleeves; The magnetic fixation method can complete the replacement or cleaning of the filter sleeve without tools, greatly shortening the maintenance time.

[0034] As Figure 1 、 Figure 4 shown, the quick - closing valve body 1 further includes an air inlet end 22, an air outlet end 23 and a transmission end 24. A valve rod 25 is arranged at the output end of the transmission end 24. A valve plate 26 for closing the air outlet end 23 is arranged at the end of the valve rod 25. The filter screen cylinder 2 is located outside the valve plate 26. Both the valve rod 25 and the valve plate 26 are located in the filter cavity 4.

[0035] Among them, the transmission end 24 realizes the movement of the valve plate 26 by the way of the oil cylinder driving the valve rod 25. This is the prior art, so no more description is made; It further includes: A gas pressure sensor 27 is used to detect the gas pressure at the inlet end 22 when the gas enters the filter cartridge 2 and after passing through the filter cartridge 2 and entering the outlet end 23. An audible and visual alarm 28 is electrically connected to the gas pressure sensor 27. Specifically, by collecting the gas pressure data on the inlet side and the outlet side of the filter cartridge 2 in real time and calculating the pressure difference between the two; when the pressure difference exceeds a preset threshold value (this threshold value can be adjusted in real time by the operator according to historical data and the current pressure change trend), the gas pressure sensor 27 will send a trigger signal to the audible and visual alarm 28, causing the audible and visual alarm 28 to immediately activate the early warning function.

[0036] For example, in a working condition with a high concentration of steam impurities, the threshold value can be appropriately reduced to trigger the early warning in advance; conversely, in a stable working condition, the threshold value can be increased to reduce the frequency of false alarms.

[0037] The working principle and usage process of the present invention: High-temperature and high-pressure steam enters the filter chamber 4 from the inlet end 22. At the same time, the drive motor 71 drives the rotating rod 73 to rotate through the speed reducer 72. The gear 74 on the rotating rod 73 meshes with the toothed ring 75 of the filter cartridge 2, driving the filter cartridge 2 to rotate uniformly in the circumferential direction. The high-temperature and high-pressure steam flows through the outer surface (filter section) of the rotating filter cartridge 2, and impurities are intercepted outside the filter cartridge 2. Moreover, the eccentric wheel 8 fixedly connected to the rotating rod 73 rotates in the transmission hole 10, driving the brush plate 9 to reciprocate in a direction parallel to the axis of the filter cartridge 2 under the constraint of the guide rail sleeve 11, mechanically brushing the cleaning section of the filter cartridge 2 to remove impurities attached to the inner surface of the filter screen. Another output end of the drive motor 71 will synchronously drive the fan blade 1632 to rotate, sucking external air into the intake sleeve 1633 after filtering through the second filter sleeve 19. The pressurized air flow enters the inner cavity of the ring sleeve 12 through the diversion pipe 161 (the check valve 162 prevents backflow), and then is sprayed onto the inner side of the filter cartridge 2 through the jet plate 15, forming a reverse blowing air flow to assist the brush and suction operation of the brush plate 9 to peel off stubborn impurities. The impurities in the cleaning chamber 5 are discharged through the air guide valve 17 with the air flow, and the first filter sleeve 18 intercepts the escaping particles, thus completing the entire cleaning operation.

[0038] While the cleaning operation is in progress, the gas pressure sensor 27 monitors the gas pressure difference between the inlet side and the outlet side of the filter cartridge 2 in real time. When the pressure difference exceeds the set threshold value, the audible and visual alarm 28 triggers an early warning, indicating that the filter screen is blocked or the cleaning is abnormal. The operation and maintenance personnel can quickly disassemble the first filter sleeve 18 and the second filter sleeve 19 through the magnetic pull plate 29 for cleaning or replacement without shutting down and disassembling the valve body.

[0039] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0040] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine high-pressure main gas valve casting, comprising a quick-closing valve body (1), characterized in that: Also includes: A filter screen cylinder (2) is rotatably disposed in the quick-closing valve body (1); A partition (3) is fixedly mounted in the quick-closing valve body (1) to separate the quick-closing valve body into a filtering chamber (4) and a cleaning chamber (5); The partition plate (3) is provided with a receiving hole (6), and the filter screen cylinder (2) passes through the receiving hole (6) and forms: a filter section located in the filter cavity (4), the outer surface of which forms a filter working surface; and a cleaning section extending into the cleaning cavity (5); A rotating transmission member (7) drives the filter screen cylinder (2) to rotate circumferentially within the cleaning chamber (5); An eccentric wheel (8) connected to the output end of the rotating transmission member (7); A brush plate (9) is arranged parallel to the axis of the filter screen cylinder (2) and in contact with the surface of the filter screen cylinder (2), and has a transmission hole (10) formed at the end thereof, wherein the eccentric wheel (8) is located in the transmission hole (10); A guide rail sleeve (11) is fixedly disposed in the cleaning chamber (5) and is slidably connected to the brush plate (9); As the rotating transmission member (7) drives the filter screen cylinder (2) to rotate circumferentially, the filter section of the filter screen cylinder (2) continuously intercepts fluid impurities, while the eccentric wheel (8) rotates circumferentially, thereby driving the brush plate (9) to reciprocate under the constraint of the guide rail sleeve (11) to clean the cleaning section of the filter screen cylinder (2).

2. A steam turbine high pressure main valve casting according to claim 1, characterized in that: The rotating transmission member (7) comprises: A transmission motor (71) is arranged outside the quick-closing valve body (1); A speed reducer (72) connected to an output end of the transmission motor (71); A rotating rod (73) connected to the output end of the reducer (72) and having one end extending through the clean chamber (5) of the quick-closing valve body (1); A gear (74) is fixed to the through-end of the rotating rod (73); A gear ring (75) connected to the filter screen cylinder (2) and meshing with the gear (74); The eccentric wheel (8) is fixedly arranged on the outside of the rotating rod (73).

3. A steam turbine high pressure main valve casting according to claim 2, characterized in that: Also includes: The ring sleeve (12) is inserted into the partition plate (3) and is hollow inside, and is located on one side of the filter screen cylinder (2); A rotating ring (13) is rotatably disposed in the ring sleeve (12) and is fixedly connected to the filter screen cylinder (2) via a clamping rod (14); A gear ring (75) is provided on the side of the rotating ring (13) away from the filter screen cylinder (2), and one end of the rotating rod (73) penetrates into the ring sleeve (12); An air jet plate (15) is located inside the filter screen cylinder (2) and one end of which penetrates into the ring sleeve (12); The air jet plate (15) is arranged parallel to the axis of the filter screen cylinder (2) and its air outlet faces the filter screen cylinder (2); The air guide channel (16) is communicated with the interior of the annular sleeve (12).

4. A steam turbine high pressure main valve casting according to claim 3, characterized in that: Also includes: An air guide valve (17) connected to the cleaning chamber (5); The first filter sleeve (18) is arranged at the end of the air guide valve (17).

5. A steam turbine high pressure main valve casting according to claim 4, characterized in that: The air guide channel (16) comprises: A flow guide tube (161) communicates with the inner cavity of the annular sleeve (12) and the other end of which passes through the quick-closing valve body (1); The flow guide pipe (161) is provided with a check valve (162); The air supply cylinder (163) is used to guide the air flow into the guide pipe (161).

6. A steam turbine high pressure main valve casting according to claim 5, characterized in that: The air supply cylinder (163) comprises: A cylinder (1631) is arranged outside the quick-closing valve body (1); The fan blade (1632) is disposed in the cylinder (1631); An air inlet sleeve (1633), which is in communication with the cylinder (1631) and is located on the air inlet side of the fan blade (1632); The communicating end of the flow guide pipe (161) and the cylinder (1631) is located on the air supply side of the fan blade (1632); The transmission motor (71) is a dual-shaft motor, one output end of which is connected to the reducer (72), and the other output end of which is connected to the fan blade (1632).

7. A steam turbine high pressure main valve casting according to claim 6, characterized in that: A second filter sleeve (19) is provided at the end of the air inlet sleeve (1633), a mounting plate (20) is provided on the outside of the quick-closing valve body (1), a magnet sheet (21) is provided on the mounting plate (20), a pull plate (29) is provided between the first filter sleeve (18) and the second filter sleeve (19), and the pull plate (29) is magnetically attracted to the magnet sheet (21).

8. A steam turbine high pressure main valve casting according to any one of claims 1 to 7, characterized in that: The quick-closing valve body (1) further comprises an air inlet end (22), an air outlet end (23) and a transmission end (24); the output end of the transmission end (24) is provided with a valve stem (25); the end of the valve stem (25) is provided with a valve plate (26) for closing the air outlet end (23); the filter screen cylinder (2) is located outside the valve plate (26); and the valve stem (25) and the valve plate (26) are both located in the filter chamber (4).

9. A steam turbine high pressure main valve casting according to claim 8, characterized in that: Also includes: A gas pressure sensor (27) is used to detect the pressure of gas entering the filter cylinder (2) from the air inlet end (22) and entering the air outlet end (23) after being filtered through the filter cylinder (2); The sound and light alarm (28) is electrically connected to the gas pressure sensor (27).

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