A deep peak regulation device for thermal power units

Abstract

This invention relates to the field of thermal power generation technology, specifically to a deep peak-shaving device for thermal power units. It includes a medium-pressure combined steam valve for regulating steam output. The valve comprises a valve body, a valve seat, and a valve stem. The valve seat is movably installed inside the valve body, and the valve stem is slidably installed on the upper part of the valve body, with the valve stem fixedly connected to the valve seat. This invention, through the periodic turning operation of the valve seat, allows for switching of the heated surface of the valve seat and its sealing components facing the steam side. During long-term continuous operation, this improves the sealing strength of the valve seat during steam blocking operations, reduces localized excessive heating or pressure, extends the service life of the valve seat itself, and enhances its structural strength under continuous use, thereby improving the operational safety and stability of the thermal power unit.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, in particular to a deep peak regulation device for a thermal power unit. Background Art

[0002] A thermal power generating unit uses coal, oil or combustible gas as fuel to heat the water in the boiler to increase its temperature, and then uses steam with a certain pressure to drive the steam turbine to generate electricity.

[0003] The heating methods of thermal power units are medium-pressure steam and low-pressure steam. Medium-pressure steam is supplied by mixing main steam and reheated steam using a pressure matcher, and low-pressure steam is supplied by reducing the temperature and pressure of reheated steam. In order to meet the heating needs of heat users, power plant units mainly use the method of extracting steam from the main steam to supply heat to the outside, using the main steam to drive the back pressure machine, and using the exhaust steam of the back pressure machine to supply high-pressure steam to the outside. By connecting the outlet of the back pressure machine with the modified medium-pressure combined steam valve, the dispatch of high-pressure steam is controlled to achieve energy saving and consumption reduction; however, in this process, the steam supply needs to be frequently dispatched according to the use needs of heat users, which causes the local wear and aging of the sealing components in the steam transmission medium-pressure combined steam valve to increase. During the steam dispatching process, the steam delivery pressure in the pipeline will also change accordingly, which is easy to cause the loosening of the sealing components, resulting in the problem of reduced sealing performance and its own service life, and the hidden danger of gas leakage, which is not conducive to the continuous and stable operation of the thermal power unit. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the present invention provides a deep peak regulation device for a thermal power unit, thereby solving the problem of increased fatigue loss of sealing materials and reduced service life caused by the existing steam transportation regulation method when facing the continuous changes in steam pressure and scheduling volume.

[0005] The technical solution adopted by the present invention to solve its technical problem is a deep peak regulation device for a thermal power unit, comprising a medium-pressure combined steam valve for regulating steam output.

[0006] The medium-pressure combined steam valve comprises a valve body, a valve seat and a valve stem, wherein the valve seat is movably installed inside the valve body, the valve stem is slidably installed on the upper part of the valve body, and the valve stem is fixedly connected to the valve seat.

[0007] On the other hand, the valve body as a whole is an inverted "T" shaped structure. The horizontal part of the valve body is provided with a steam flow channel parallel to its axial direction, and the vertical part of the valve body is provided with an adjusting flow channel parallel to its axial direction. The adjusting flow channel and the steam flow channel are perpendicular to and connected to each other, and the valve seat moves between the steam flow channel and the adjusting flow channel.

[0008] On the other hand, a gas-tight ring is fixedly installed in the middle of the steam flow channel, and the valve seat contacts the gas-tight ring until it is completely fitted during the process of entering the steam flow channel.

[0009] On the other hand, a regulator is fixedly installed on the upper part of the valve body, an adjusting motor is fixedly installed in the regulator, an adjusting cylinder is rotatably installed on the upper part of the valve body, the upper part of the adjusting cylinder is fixedly connected to the output shaft of the adjusting motor, the inner cavity of the adjusting cylinder is provided with an internal thread, the upper part of the valve stem is located in the adjusting cylinder, and the upper part of the valve stem is provided with an external thread meshing with the internal thread.

[0010] On the other hand, the vertical portion of the valve body is provided with an inspection port in a direction perpendicular to its axis, the inspection port runs through the regulating flow channel, locking plates are fixedly installed at both ends of the inspection port, and a pressure gauge for detecting the gas pressure in the inspection port pipeline is fixedly installed on the inner side of the inspection port.

[0011] On the other hand, a spherical groove is provided at the overlapping intersection of the inspection port and the regulating flow channel, and the valve seat is fitted to the inner wall of the spherical groove.

[0012] On the other hand, the bottom of the valve stem slides and inserts into the inner side of the spherical groove, a locking clamp is fixedly installed at the bottom of the valve stem, there are two valve seats which are symmetrically rotated and installed on both sides of the locking clamp, and a sealing ring which seals with the valve stem is fixedly installed in the valve body.

[0013] On the other hand, a steering groove is provided in the middle of the valve body, and a steering frame is slidably installed in the steering groove. The middle of the valve stem passes through the middle gap of the steering frame. Hand levers are fixedly installed at both ends of the steering frame, and the hand levers extend to both sides perpendicular to the axis direction of the vertical part of the valve body and pass through the outer wall of the valve body. A reversing gear is fixedly installed in the middle of the valve stem, and racks meshing with the reversing gears are staggered front and back on the inner walls of both sides of the steering frame.

[0014] On the other hand, a deformation groove is provided in the middle of the valve seat, and the cross section of the deformation groove is a triangular structure. A valve seat ring is filled in the deformation groove, and the valve seat ring is sealed with an airtight ring.

[0015] On the other hand, the side of the deformation groove away from the locking clamp is a planar structure, and the side of the deformation groove close to the locking clamp is a sloped structure. The valve seat ring is located inside the deformation groove and protrudes from the outer ring surface of the valve seat ring. A ball is circumferentially installed on the flat side of the deformation groove to reduce the sliding resistance of the valve seat ring.

[0016] On the other hand, a side surface of the valve seat ring away from the locking clamp is circumferentially provided with an expansion joint suitable for elastic deformation of the edge position of the valve seat ring.

[0017] On the other hand, a gear ring is circumferentially provided on the side of the valve seat ring facing the locking clamp, and a semi-annular notch is provided on the middle part of the airtight ring facing the vertical part of the valve body. A gear rod is fixedly installed on the upper part of the semi-annular notch along the vertical tangent direction of its outer contour, and the gear rod is meshed with the gear ring.

[0018] Beneficial effects of the present invention:

[0019] (1) The present invention monitors the steam pressure in the inspection port by means of a pressure gauge, thereby determining the sealing conditions between the valve seat and the steam flow channel and the regulating flow channel, and further determining the quality of the sealing performance of the valve seat under continuous use, thereby improving the timeliness of early warning for monitoring the safe and stable operation of thermal power units.

[0020] (2) The present invention can realize the switching of the heated surface of the valve seat and its sealing component facing the steam side through the periodic turning operation of the valve seat, thereby improving the sealing strength of the valve seat during steam blocking operation during long-term continuous operation, reducing local excessive heating and overpressure, increasing the service life of the valve seat itself and its own structural strength under continuous use, improving the utilization rate of materials, and further improving the operating safety and stability of the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall connection structure of the present invention;

[0023] Figure 2 It is a partial cross-sectional schematic diagram of the valve body in the present invention;

[0024] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0025] Figure 4 It is a partial cross-sectional schematic diagram of the steam flow channel and the regulating flow channel in the present invention;

[0026] Figure 5 for Figure 4 The enlarged schematic diagram of point B in FIG.

[0027] Figure 6 It is a schematic diagram of the positional relationship between the steam flow channel and the airtight ring in the present invention;

[0028] Figure 7 for Figure 6 The enlarged schematic diagram of point C in FIG.

[0029] Figure 8 Schematic diagram of the positional relationship between the valve seat and the airtight ring in the present invention;

[0030] Fig. 9 for Figure 8 The enlarged schematic diagram of D in FIG.

[0031] Fig.10 for Figure 8 The enlarged schematic diagram of point E in FIG.

[0032] In the figure: 1. medium-pressure combined steam valve; 2. valve body; 3. valve seat; 4. valve stem; 5. steam flow channel; 6. regulating flow channel; 51. airtight ring; 7. regulator; 8. regulating cylinder; 9. inspection port; 91. locking plate; 92. pressure gauge; 93. spherical groove; 41. locking clamp; 21. sealing ring; 22. steering frame; 23. hand lever; 42. reversing gear; 24. rack; 31. deformation groove; 32. valve ring; 33. ball; 34. expansion joint; 35. gear ring; 52. gear rod. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] The embodiment of the present invention provides a deep peak regulation device for a thermal power unit, thereby solving the problem of increased fatigue loss of sealing materials and reduced service life caused by the existing steam transportation regulation method when the steam pressure and the scheduling amount are constantly changing.

[0035] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a deep peak regulation device for a thermal power unit, comprising a medium-pressure combined steam valve 1 for regulating steam output;

[0036] The medium-pressure combined steam valve 1 comprises a valve body 2, a valve seat 3 and a valve stem 4, wherein the valve seat 3 is movably mounted inside the valve body 2, the valve stem 4 is slidably mounted on the upper part of the valve body 2, and the valve stem 4 is fixedly connected to the valve seat 3;

[0037] The valve body 2 as a whole is an inverted "T"-shaped structure. The horizontal part of the valve body 2 is provided with a steam flow channel 5 along a direction parallel to its axis. A dust cover is installed at the port of the steam flow channel 5 and can be removed when in use. The vertical part of the valve body 2 is provided with an adjusting flow channel 6 along a direction parallel to its axis. The adjusting flow channel 6 and the steam flow channel 5 are perpendicular to and connected with each other. The valve seat 3 moves between the steam flow channel 5 and the adjusting flow channel 6, and the valve seat 3 slides and fits with the inner wall of the steam flow channel 5 and the inner wall of the airtight ring 51 respectively when moving, that is, the valve seat 3 cannot rotate in the steam flow channel 5 and the adjusting flow channel 6.

[0038] The heating mode of the thermal power unit in the present invention is medium-pressure steam and low-pressure steam. The medium-pressure steam is mixed by the main steam and the reheated steam using a pressure matcher, and the low-pressure steam is supplied by the reheated steam temperature reduction and pressure reduction mode. In order to meet the heating demand of the heat user with high-pressure heat pressure of 8.5±0.5MPag, temperature of 430℃, and maximum heating capacity of 671.157 t / h, the power plant unit adopts the mode of extracting steam from the main steam to supply heat to the outside, uses the main steam to drive the back pressure machine, uses the exhaust steam of the back pressure machine to supply high-pressure steam to the outside, connects the outlet of the back pressure machine with the medium-pressure combined steam valve 1, thereby controlling the dispatch of high-pressure steam to achieve energy saving and consumption reduction.

[0039] In actual use, steam is called in and out of the steam flow channel 5, and the overlap between the valve seat 3 and the steam flow channel 5 is used to control the steam flow rate.

[0040] Further, such as Figures 4 to 6 As shown, an airtight ring 51 is fixedly installed in the middle of the steam flow channel 5, and the valve seat 3 contacts the airtight ring 51 until it is fully fitted during the process of entering the steam flow channel 5. A regulator 7 is fixedly installed on the upper part of the valve body 2, and an adjusting motor is fixedly installed in the regulator 7. An adjusting cylinder 8 is rotatably installed on the upper part of the valve body 2, and the upper part of the adjusting cylinder 8 is fixedly connected to the output shaft of the adjusting motor. The inner cavity of the adjusting cylinder 8 is provided with an internal thread, the upper part of the valve stem 4 is located in the adjusting cylinder 8, and the upper part of the valve stem 4 is provided with an external thread meshing with the internal thread.

[0041] When adjusting the steam flow, the regulating motor in the regulator 7 is started to run, and the regulating cylinder 8 is driven to rotate by the regulating motor. At this time, under the action of thread engagement, the valve stem 4 slides upward or downward in the valve body 2, thereby driving the valve seat 3 to move upward or downward in the regulating channel 6, so as to adjust the overlap between the valve seat 3 and the steam channel 5, and thereby control the amount of steam passing through the steam channel 5.

[0042] Further, such as Figure 4 and Figure 7 As shown, the vertical portion of the valve body 2 is provided with an inspection port 9 in a direction perpendicular to its axis, the inspection port 9 passes through the regulating flow channel 6, locking plates 91 are fixedly installed at both ends of the inspection port 9, and a pressure gauge 92 for detecting the gas pressure in the inspection port 9 pipeline is fixedly installed on the inner side of the inspection port 9.

[0043] During the steam delivery stage, after the position adjustment of the valve seat 3 is completed, the steam pressure in the steam flow channel 5 and the regulating flow channel 6 gradually tends to a constant value after experiencing a brief fluctuation during the adjustment process. At this time, the steam pressure in the inspection port 9 is monitored by the pressure gauge 92, thereby judging the sealing conditions between the valve seat 3 itself and the steam flow channel 5 and the regulating flow channel 6 respectively, and further judging the quality of the sealing performance of the valve seat 3 itself under continuous use, thereby improving the timeliness of the early warning of the safe and stable operation monitoring of the thermal power unit.

[0044] Further, such as Figures 4 to 6 As shown, a spherical groove 93 is provided at the overlapping intersection of the inspection port 9 and the regulating flow channel 6, the valve seat 3 is fitted to the inner wall of the spherical groove 93, the bottom of the valve stem 4 slides and inserts into the inner side of the spherical groove 93, a locking clamp 41 is fixedly installed at the bottom of the valve stem 4, there are two valve seats 3 and they are symmetrically rotatably installed on both sides of the locking clamp 41, and a sealing ring 21 that is sealingly fitted with the valve stem 4 is fixedly installed in the valve body 2.

[0045] When the valve seat 3 completely enters the steam flow channel 5, the valve seat 3 is completely fitted with the airtight ring 51. At this time, the steam transportation operation stops. When the valve seat 3 is completely moved out of the steam flow channel 5, the valve seat 3 stays at the position of the spherical groove 93, and the valve seat 3 is sealed and fitted with the middle of the spherical groove 93. At this time, the steam flow channel 5 is in a fully open state, the steam transportation volume is maximum, and the sealing ring 21 can isolate the overflow of the steam transported in the pipeline, thereby reducing invalid losses.

[0046] Further, such as Figures 2 to 4 As shown, a steering groove is provided in the middle of the valve body 2, and a steering frame 22 is slidably installed in the steering groove. The middle of the valve stem 4 passes through the middle gap of the steering frame 22, and hand levers 23 are fixedly installed at both ends of the steering frame 22. The hand levers 23 extend to both sides perpendicular to the axis direction of the vertical part of the valve body 2 and pass through the outer wall of the valve body 2. A reversing gear 42 is fixedly installed in the middle of the valve stem 4, and racks 24 meshing with the reversing gear 42 are staggered on the inner walls of both sides of the steering frame 22.

[0047] When the valve seat 3 moves from the steam flow channel 5 to the spherical groove 93, the valve seat 3 contacts the inner wall of the regulating flow channel 6 and moves upward while maintaining a fixed posture. When the valve seat 3 moves into the spherical groove 93 and gradually completely overlaps with the spherical groove 93, the reversing gear 42 gradually engages with the rack 24, further limiting its own rotation.

[0048] The side of the valve seat 3 facing the steam input direction is kept in contact with the high-pressure steam for a long time during the steam delivery stop stage, so that its own sealing performance and service life are correspondingly reduced compared with the side away from the steam delivery. For this reason, during the steam delivery stage, when the valve seat 3 is located in the spherical groove 93, the locking effect on the hand lever 23 is released, and the hand lever 23 is driven by the staff or an external driving source to make the hand lever 23 slide horizontally on the valve body 2, thereby driving the steering frame 22 to move. At this time, the rack 24 located on one side of the steering frame 22 is in meshing contact with the reversing gear 42, and drives the reversing gear 42 to rotate, thereby driving the valve stem 4 to rotate synchronously, and the valve seat 3 is driven to rotate by the valve stem 4, so that the two symmetrically installed valve seats 3 are turned 180 degrees in direction, thereby realizing the switching of the valve seat 3 facing the steam entry sealing surface. During long-term continuous operation, by regularly switching the directions of the two valve seats 3, the sealing strength of the valve seat 3 to achieve steam blocking operation can be improved, and the service life of the valve seat 3 itself and the uniformity of its own structural strength can be improved, thereby improving the utilization rate of materials.

[0049] Further, such as Figures 8 to 10As shown, a deformation groove 31 is provided in the middle of the valve seat 3, and the cross-section of the deformation groove 31 is a triangular structure. A valve ring 32 is filled in the deformation groove 31, and the valve ring 32 is sealed with the airtight ring 51. The side of the deformation groove 31 away from the locking clamp 41 is a plane structure, and the side of the deformation groove 31 close to the locking clamp 41 is an inclined structure. The valve ring 32 is located in the deformation groove 31 and the outer ring surface of the valve ring 32 protrudes. A ball 33 for reducing the sliding resistance of the valve ring 32 is circumferentially installed on the plane side of the deformation groove 31, and an expansion joint 34 suitable for elastic deformation of the edge position of the valve ring 32 is circumferentially provided on the side of the valve ring 32 away from the locking clamp 41.

[0050] In daily use, when the valve seat 3 and the airtight ring 51 overlap to achieve steam sealing, the side with the expansion joint 34 faces the steam input pressure, so that the edge of the valve seat 3 is squeezed and thus generates an extrusion force in the direction of the valve ring 32. The deformation groove 31 and the expansion joint 34 can adapt to the elastic deformation formed by the pressure on the side of the valve seat 3 facing the steam input direction. When the edge of the valve seat 3 is deformed, the notch of the deformation groove 31 shrinks inward, thereby forming an extrusion pressure on the valve ring 32. Through the triangular notch design and the friction reduction effect of the ball 33, the valve ring 32 is squeezed. The fit between the deformation groove 31 is strengthened, and the outer edge contour of the valve ring 32 produces an outward protruding deformation, so that the fit and sealing degree between the valve ring 32 and the airtight ring 51 is synchronously enhanced, and in the high-pressure environment facing the steam input direction, it adapts to pressure changes and provides a sufficient sealing effect.

[0051] In addition, when the maintenance cycle is reached or the pressure gauge 92 detects abnormal air pressure, the steam output of the back pressure machine is closed, and the valve seat 3 reaches the position of the spherical groove 93 through the operation of the regulator 7. Then, the locking plate 91 is opened, and the valve seat 3 can be inspected and replaced through the inspection port 9, which is convenient and easy.

[0052] Further, such as Figure 8 and Fig. 9 As shown, a toothed ring 35 is circumferentially provided on the side of the valve ring 32 facing the locking clamp 41, and a semi-annular notch is provided on the middle side of the airtight ring 51 facing the vertical part of the valve body 2, and a toothed rod 52 is fixedly installed on the upper part of the semi-annular notch along the vertical tangent direction of its outer contour, and the toothed rod 52 is meshed with the toothed ring 35.

[0053] In order to further improve the service life of the valve seat 3, during the opening and closing process between the valve seat 3 and the airtight ring 51, the valve ring 32 below the valve seat 3 will generate a large steam flow rate, and the impact force generated by the steam on the valve seat 3 and the valve ring 32 during the flow process will be greater than that on other parts. For this reason, a gear ring 35 is provided at the edge of the valve seat 3. When the valve seat 3 approaches or moves away from the airtight ring 51, the gear ring 35 engages with the gear rod 52, thereby causing the valve seat 3 to rotate, and driving the valve ring 32 to rotate through the valve seat 3, thereby continuously switching the contact point between the valve seat 3 and the flowing steam in the steam flow channel 5, while improving the heating uniformity of the valve seat 3, avoiding long-term erosion of a single part by high-pressure steam, causing local fatigue damage, resulting in reduced sealing performance and service life.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A deep peak regulation device for a thermal power unit, characterized in that: It includes a medium-pressure combined steam valve (1) for regulating steam output; The medium-pressure combined steam valve (1) comprises a valve body (2), a valve seat (3) and a valve stem (4), wherein the valve seat (3) is movably mounted inside the valve body (2), the valve stem (4) is slidably mounted on the upper part of the valve body (2), and the valve stem (4) is fixedly connected to the valve seat (3); The valve body (2) is an inverted "T"-shaped structure as a whole. A steam flow channel (5) is provided on a horizontal portion of the valve body (2) in a direction parallel to its axis. A regulating flow channel (6) is provided on a vertical portion of the valve body (2) in a direction parallel to its axis. The regulating flow channel (6) and the steam flow channel (5) are perpendicular to and communicate with each other. The valve seat (3) moves between the steam flow channel (5) and the regulating flow channel (6). A gas-tight ring (51) is fixedly mounted in the middle of the steam flow channel (5), and the valve seat (3) contacts the gas-tight ring (51) until it is completely fitted when entering the steam flow channel (5); A steering groove is provided in the middle of the valve body (2), a steering frame (22) is slidably mounted in the steering groove, the middle of the valve stem (4) passes through the middle gap of the steering frame (22), hand levers (23) are fixedly mounted at both ends of the steering frame (22), and the hand levers (23) extend to both sides perpendicular to the axis direction of the vertical portion of the valve body (2) and pass through the outer wall of the valve body (2), a reversing gear (42) is fixedly mounted in the middle of the valve stem (4), and racks (24) meshing with the reversing gear (42) are staggeredly arranged on the inner walls of both sides of the steering frame (22) front and back.

2. A deep peak regulation device for a thermal power unit according to claim 1, characterized in that: A regulator (7) is fixedly mounted on the upper part of the valve body (2), an adjusting motor is fixedly mounted inside the regulator (7), an adjusting cylinder (8) is rotatably mounted on the upper part of the valve body (2), the upper part of the adjusting cylinder (8) is fixedly connected to the output shaft of the adjusting motor, an inner cavity of the adjusting cylinder (8) is provided with an internal thread, the upper part of the valve stem (4) is located inside the adjusting cylinder (8), and the upper part of the valve stem (4) is provided with an external thread meshing with the internal thread.

3. A deep peak regulation device for a thermal power unit according to claim 1, characterized in that: The vertical portion of the valve body (2) is provided with an inspection port (9) in a direction perpendicular to the axial line thereof, the inspection port (9) passing through the regulating flow channel (6), locking plates (91) are fixedly mounted at both ends of the inspection port (9), and a pressure gauge (92) for detecting the gas pressure in the inspection port (9) pipeline is fixedly mounted on the inner side of the inspection port (9).

4. A deep peak regulation device for thermal power generation units according to claim 3, characterized in that: A spherical groove (93) is provided at the overlapping intersection of the inspection port (9) and the regulating flow channel (6), and the valve seat (3) is fitted to the inner wall of the spherical groove (93).

5. A deep peak regulation device for thermal power generation units according to claim 4, characterized in that: The bottom of the valve stem (4) is slidably inserted into the inner side of the spherical groove (93), a locking clamp (41) is fixedly installed on the bottom of the valve stem (4), two valve seats (3) are symmetrically rotatably installed on both sides of the locking clamp (41), and a sealing ring (21) that is sealed and fitted with the valve stem (4) is fixedly installed in the valve body (2).

6. A deep peak regulation device for thermal power generation units according to claim 5, characterized in that: A deformation groove (31) is provided in the middle of the valve seat (3). The cross section of the deformation groove (31) is a triangular structure. A valve ring (32) is filled in the deformation groove (31). The valve ring (32) is sealed with the airtight ring (51).

7. A deep peak regulation device for thermal power generation units according to claim 6, characterized in that: The side of the deformation groove (31) away from the locking clamp (41) is a planar structure, and the side of the deformation groove (31) close to the locking clamp (41) is an inclined structure. The valve ring (32) is located in the deformation groove (31) and the outer ring surface of the valve ring (32) protrudes. A ball (33) for reducing the sliding resistance of the valve ring (32) is circumferentially installed on the plane side of the deformation groove (31).

8. A deep peak regulation device for a thermal power unit according to claim 7, characterized in that: An expansion joint (34) suitable for elastic deformation of the edge of the valve ring (32) is provided in the circumferential direction of the side surface of the valve ring (32) away from the locking clamp (41).

9. A deep peak regulation device for a thermal power unit according to claim 8, characterized in that: A toothed ring (35) is provided in the circumferential direction on one side of the valve ring (32) facing the locking clamp (41), a semi-annular notch is provided on the middle side of the airtight ring (51) facing the vertical portion of the valve body (2), a toothed rod (52) is fixedly mounted on the upper portion of the semi-annular notch along the vertical tangent direction of its outer contour, and the toothed rod (52) is meshed with the toothed ring (35).

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