A steam turbine regulating valve device for power plants

Abstract

The present invention discloses a steam turbine regulating valve device for a power plant, which is applied to the main steam valve of the steam turbine. The device comprises: a disassembly cover, a driving mechanism, and a movable limiting shaft. The front side of the disassembly cover is provided with a top air hole, a middle air hole, and a bottom air hole in sequence from top to bottom. The back side of the disassembly cover is provided with a driving mechanism. The movable limiting shaft is provided inside the disassembly cover. The back side of the disassembly cover is also provided with a lifting groove, and the driving mechanism is connected to the movable limiting shaft via the lifting groove. The driving mechanism is used to control the movable limiting shaft to move downward to a first preset position when the main steam valve is opened, and to control the movable limiting shaft to move upward to a second preset position when the main steam valve is closed. The movable limiting shaft is provided with an upper sealing block, a guide spiral, an agitating blade, and a lower sealing block in sequence from top to bottom. The present invention alleviates the problem of insufficient or stagnant steam input from the steam turbine in a short period of time in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine valve regulating devices, in particular to a steam turbine valve regulating device for a power plant. Background Art

[0002] A steam turbine is a thermal machine that uses high-temperature, high-pressure steam to drive its rotor, and is widely used in power plants. The turbine's damper is a crucial component for controlling steam flow, and its operating principle significantly impacts the turbine's performance and safety.

[0003] The function of a steam turbine throttle valve is to regulate steam flow, controlling turbine speed and power output. The throttle valve typically consists of a cylindrical valve and a drive mechanism. The valve's opening is controlled by the drive mechanism, thereby regulating steam flow. The wider the throttle valve opening, the greater the steam flow, which in turn increases the turbine speed and power output.

[0004] In the prior art, the steam outflow time of the turbine regulating valve device is long, and the internal space needs to be completely filled before the discharge action can be performed. The steam input by the turbine is not delivered enough or the delivery is stagnant in a short time. Summary of the Invention

[0005] The object of the present invention is to provide a steam turbine regulating valve device for a power plant in order to solve at least one of the above technical problems.

[0006] In the first aspect, an embodiment of the present invention provides a steam turbine regulating valve device for a power plant, which is applied to the main steam valve of the steam turbine; it includes: a disassembly cover, a driving mechanism and a movable limiting shaft; the front side of the disassembly cover is provided with a top air hole, a middle air hole and a bottom air hole in sequence from top to bottom; the back side of the disassembly cover is provided with the driving mechanism; the movable limiting shaft is provided inside the disassembly cover; the back side of the disassembly cover is also provided with a lifting groove, and the driving mechanism is connected to the movable limiting shaft through the lifting groove; the driving mechanism is used to control the movable limiting shaft to move downward to when the main steam valve is opened. a first preset position, and is used to control the movable limit shaft to move upward to a second preset position when the main steam valve is closed; an upper sealing block, a guide spiral, an agitator blade and a lower sealing block are sequentially arranged on the movable limit shaft from top to bottom; wherein, when the movable limit shaft is in the first preset position, the upper sealing block is located between the top air hole and the middle air hole, and the lower sealing block is located below the bottom air hole; when the movable limit shaft is in the second preset position, the upper sealing block is located above the top air hole, and the lower sealing block blocks the bottom air hole.

[0007] Furthermore, the top air hole is connected to the nozzle of the steam turbine through a steam pipe, the middle air hole is connected to the main steam valve and the nozzle of the steam turbine through a steam pipe, and the bottom air hole is connected to the main steam valve through a steam pipe.

[0008] Furthermore, a protection box is provided on the back side of the disassembly cover, and the driving mechanism is provided in the protection box.

[0009] Furthermore, the protective box also includes a partition and a box door; the driving mechanism includes a driving rod, a ring, a tooth plate, a driving motor and a driving gear; wherein, the partition is fixed at the middle position inside the protective box, and the box door is arranged on the back of the protective box; the driving motor is arranged on the partition, and the driving gear is fixed on the rotating shaft of the driving motor; the ring is arranged inside the disassembly cover and is fixed to the top end of the movable limiting shaft; one end of the driving rod is fixedly connected to the ring, and the other end of the driving rod passes through the lifting slot and is fixedly connected to the tooth plate; the tooth plate is engaged with the driving gear.

[0010] Furthermore, the protective box is fixed to the back side of the disassembly cover by welding.

[0011] Furthermore, when the movable limit shaft is in the first preset position, the agitator blade is located opposite to the bottom air hole, and the top end of the guide spiral is located opposite to the middle air hole; the gas of the main steam valve flows into the bottom air hole and drives the agitator blade, so that the agitator blade blows away the gas remaining in the guide spiral blade.

[0012] Furthermore, when the movable limit shaft is in the second preset position, the agitator blade is located opposite to the middle air hole, and the top end of the guide spiral is located opposite to the top air hole; the gas of the main steam valve flows into the middle air hole and drives the agitator blade, so that the agitator blade blows away the gas remaining in the guide spiral blade.

[0013] The present invention provides a steam turbine regulating valve device for a power plant. By arranging agitating blades under the guide spiral vanes, the steam input by the steam turbine can be used to drive the agitating blades, and the agitating blades can be used to discharge the gas remaining in the guide spiral vanes. This eliminates the need in the prior art to completely fill the internal space before discharging it, shortens the gas transmission time, and alleviates the problem in the prior art that the steam input by the steam turbine is insufficiently delivered or stagnant in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 An overall schematic diagram of a steam turbine valve regulating device for a power plant provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of an explosion front view of a steam turbine valve regulating device for a power plant provided by an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of an exploded rear side view of a steam turbine valve regulating device for a power plant provided by an embodiment of the present invention;

[0018] Figure 4 An exploded view of a protective box provided in an embodiment of the present invention.

[0019] In the figure: 1. Disassembly and assembly cover, 2. Movable limit shaft, 3. Upper sealing block, 4. Agitator blade, 5. Guide spiral, 6. Lower sealing block, 7. Bottom air hole, 8. Middle air hole, 9. Top air hole, 10. Steam pipe, 11. Protective box, 12. Partition, 13. Lifting groove, 14. Drive rod, 15. Ring, 16. Gear plate, 17. Drive motor, 18. Drive gear, 19. Box door. DETAILED DESCRIPTION

[0020] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Figure 1 1 is an overall schematic diagram of a steam turbine valve regulating device for a power plant provided according to an embodiment of the present invention, wherein the valve regulating device is applied to the main steam valve of the steam turbine. Figure 1 As shown, the device includes: a disassembly cover 1 and a driving mechanism; the driving mechanism is set on the back side of the disassembly cover 1.

[0022] Specifically, if Figure 1 As shown, a protection box 11 is provided on the back side of the disassembly cover 1 , and the driving mechanism is provided in the protection box 11 .

[0023] Preferably, the protection box 11 is fixed to the back side of the disassembly cover 1 by welding.

[0024] Figure 2 1 is a schematic diagram of an explosion front view of a steam turbine regulating valve device for a power plant provided according to an embodiment of the present invention. Figure 2 As shown, it also includes a movable limiting shaft 2. Specifically, as Figure 2 As shown, the front side of the disassembly cover 1 is provided with a top air hole 9, a middle air hole 8 and a bottom air hole 7 in order from top to bottom. The movable limiting shaft 2 is provided inside the disassembly cover 1.

[0025] Figure 3 1 is a schematic diagram of the exploded back of a steam turbine regulating valve device for a power plant provided according to an embodiment of the present invention. Figure 3 As shown, a lifting slot 13 is further provided on the back side of the disassembly cover 1 , and the driving mechanism is connected to the movable limiting shaft 2 via the lifting slot 13 .

[0026] like Figure 3 As shown, the upper sealing block 3, the guide spiral sheet 5, the agitating blade 4 and the lower sealing block 6 are sequentially arranged on the movable limiting shaft 2 from top to bottom.

[0027] Specifically, the driving mechanism is used to control the movable limit shaft 2 to move downward to a first preset position when the main steam valve is opened, and to control the movable limit shaft 2 to move upward to a second preset position when the main steam valve is closed.

[0028] Among them, when the movable limiting shaft 2 is in the first preset position, the upper sealing block 3 is located between the top air hole 9 and the middle air hole 8, and the lower sealing block 6 is located below the bottom air hole 7; when the movable limiting shaft 2 is in the second preset position, the upper sealing block 3 is located above the top air hole 9, and the lower sealing block 6 blocks the bottom air hole 7.

[0029] Specifically, in an embodiment of the present invention, when the movable limit shaft 2 is in the first preset position, the agitator blade 4 is located opposite the bottom air hole 7, and the top end of the guide spiral piece 5 is located opposite the middle air hole 8; the gas of the main steam valve flows into the bottom air hole 7 and drives the agitator blade 4, so that the agitator blade 4 blows away the gas remaining in the guide spiral piece 5.

[0030] In an embodiment of the present invention, when the movable limit shaft 2 is in the second preset position, the agitator blade 4 is located opposite to the middle air hole 8, and the top end of the guide spiral plate 5 is located opposite to the top air hole 9; the gas of the main steam valve flows into the middle air hole 8 and drives the agitator blade 4, so that the agitator blade 4 blows away the gas remaining in the guide spiral plate 5.

[0031] Specifically, in this embodiment of the present invention, the top air hole 9 is connected to the nozzle of the steam turbine via a steam pipe 10, the middle air hole 8 is connected to both the main steam valve and the nozzle of the steam turbine via the steam pipe 10, and the bottom air hole 7 is connected to the main steam valve via the steam pipe 10. Optionally, the middle air hole 8 is connected to the nozzle and the main steam valve via a three-way valve.

[0032] Figure 4 FIG. 1 is an exploded view of a protective box according to an embodiment of the present invention. Figure 4 As shown, the protective box 11 further includes a partition 12 and a box door 19 .

[0033] Specifically, if Figure 4 As shown, the driving mechanism includes a driving rod 14, a collar 16, a tooth plate 16, a driving motor 17 and a driving gear 18. Among them, the partition 12 is fixed to the middle position inside the protection box 11, and the box door 19 is set on the back of the protection box 11.

[0034] Drive motor 17 is mounted on partition 12, with drive gear 18 secured to the shaft of drive motor 17. Collar 15 is located within disassembly cover 1 and securely fits over the top of movable stopper shaft 2. One end of drive rod 14 is securely connected to collar 15, while the other end passes through lifting slot 13 and securely connects to toothed plate 16, which meshes with drive gear 18.

[0035] In the embodiment of the present invention, the driving motor 17 drives the driving gear 18 to rotate, further drives the gear plate 16 to move up and down, the gear plate 16 drives the collar 15 to move through the driving rod 14, and the collar 15 further drives the movable limit shaft 2 to move up and down.

[0036] The embodiment of the present invention provides a steam turbine regulating valve device for a power plant. When the main steam valve is opened, the movable limit shaft 2 drives the various components thereon to move downward, the upper sealing block 3 moves downward to isolate the top air hole 9 from the lower half, and the lower sealing block 6 releases the bottom air hole 7. At this time, the gas flows in from the bottom air hole 7 and then flows out from the middle air hole 8. The gas just flowing in from the bottom air hole 7 will directly impact the agitator blades 4, driving the agitator blades 4 to rotate. When the agitator blades 4 rotate, the gas remaining between the guide spirals 5 will be blown away in the first time, and the top end of the guide spiral 5 is designed to be aligned with the middle air hole 8. This can reduce the time for gas outflow, that is, eliminate the previous need to completely fill the internal space before it can be discharged, shorten the gas transmission time, and solve the problem of insufficient or stagnant steam input to the turbine in a short time.

[0037] Similarly, when closing the main steam valve, the drive motor 17 rotates in the opposite direction, driving the movable limit shaft 2 and the structure thereon to move upward through the collar 15. The lower sealing block 6 blocks the bottom air hole 7, and the upper sealing block 3 releases the top air hole 9. The gas flows in from the middle air hole 8 and flows out from the top air hole 9. The movement of the internal structure is the same as when opening the main steam valve.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A steam turbine valve regulating device for a power plant, characterized in that: A main steam valve for a steam turbine comprises a disassembly cover, a drive mechanism, and a movable limit shaft. The front side of the disassembly cover is provided with a top air hole, a middle air hole, and a bottom air hole, in order from top to bottom. The back side of the disassembly cover is provided with the drive mechanism. The movable limit shaft is provided inside the disassembly cover. The back side of the disassembly cover is also provided with a lifting groove, and the drive mechanism is connected to the movable limit shaft through the lifting groove. The driving mechanism is used to control the movable limit shaft to move downward to a first preset position when the main steam valve is opened, and to control the movable limit shaft to move upward to a second preset position when the main steam valve is closed; The movable limiting shaft is provided with an upper sealing block, a guide spiral sheet, an agitating blade and a lower sealing block in order from top to bottom; In which, when the movable limiting shaft is in the first preset position, the upper sealing block is located between the top air hole and the middle air hole, and the lower sealing block is located below the bottom air hole; when the movable limiting shaft is in the second preset position, the upper sealing block is located above the top air hole, and the lower sealing block blocks the bottom air hole.

2. The steam turbine valve regulating device for a power plant according to claim 1, characterized in that: The top air hole is connected to the nozzle of the steam turbine through a steam pipe, the middle air hole is connected to the main steam valve and the nozzle of the steam turbine through a steam pipe, and the bottom air hole is connected to the main steam valve through a steam pipe.

3. The steam turbine valve regulating device for a power plant according to claim 1, characterized in that: A protection box is provided on the back side of the disassembly cover, and the driving mechanism is provided in the protection box.

4. The steam turbine valve regulating device for a power plant according to claim 3, characterized in that: The protective box also includes a partition and a box door; the driving mechanism includes a driving rod, a collar, a gear plate, a driving motor and a driving gear; wherein, The partition is fixed to the middle position inside the protection box, and the box door is arranged on the back side of the protection box; The driving motor is arranged on the partition plate, and the driving gear is fixed on the rotating shaft of the driving motor; The collar is arranged inside the disassembly cover and is fixedly sleeved on the top end of the movable limiting shaft; one end of the driving rod is fixedly connected to the collar, and the other end of the driving rod passes through the lifting slot and is fixedly connected to the gear plate; the gear plate is engaged with the driving gear.

5. The steam turbine valve regulating device for a power plant according to claim 3, characterized in that: The protection box is fixed to the back side of the disassembly cover by welding.

6. The steam turbine valve regulating device for a power plant according to claim 1, characterized in that: When the movable limit shaft is in the first preset position, the agitator blade is located opposite to the bottom air hole, and the top end of the guide spiral is located opposite to the middle air hole; the gas of the main steam valve flows into the bottom air hole and drives the agitator blade, so that the agitator blade blows away the gas remaining in the guide spiral blade.

7. The steam turbine valve regulating device for a power plant according to claim 1, characterized in that: When the movable limit shaft is in the second preset position, the agitator blade is located opposite to the middle air hole, and the top end of the guide spiral is located opposite to the top air hole; the gas of the main steam valve flows into the middle air hole and drives the agitator blade, so that the agitator blade blows away the gas remaining in the guide spiral blade.

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