Steam inlet device for steam turbine

Abstract

The invention discloses a steam admission device for a steam turbine, and belongs to the technical field of steam turbines. The steam inlet device comprises a U-shaped steam inlet pipeline and a driving part, a first adjusting valve is fixed to each opening pipeline corresponding to the steam inlet pipeline, and a first blade is rotationally connected into each first adjusting valve through a first deflection shaft; the driving part can synchronously drive the deflection angles of the first blades in the two first adjusting valves, the bottom of the steam inlet pipeline is communicated with the interior of the steam turbine steam chamber through a main pipeline after converging, the main pipeline is further provided with a second adjusting valve driven in an electric control mode, and a plurality of adjacent second blades are rotationally connected into the second adjusting valve. According to the double-loop steam admission loop, the double-loop steam admission loop is subjected to graded adjustment, throttling loss is reduced, more uniform steam admission is achieved, and the steam admission efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically, to a steam inlet device for a steam turbine. Background Technology

[0002] A steam turbine is a precision rotary power machine, whose main structure is divided into two parts: the stationary part (stator) and the rotating part (rotor). These two parts work together to convert the thermal energy of steam into mechanical energy.

[0003] Regarding the steam inlet process of the steam turbine, the steam generally enters the steam chamber of the regulating valve through the main steam pipeline, and then enters the nozzle chamber through the steam inlet pipe. In the traditional steam inlet method, the throttling regulation of steam is generally achieved by regulating all steam in the main steam pipeline loop through one or more regulating valves that open and close simultaneously, and then entering the nozzle chamber for full-circumference steam inlet. This method has the following limitations: First, the structure is relatively simple, and the throttling loss is large when the system is operating at low load, which indirectly affects the steam inlet efficiency; second, it can only regulate the main steam pipe of a single loop, and its applicability is low.

[0004] Therefore, we propose a steam inlet device for steam turbines to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a steam inlet device for a steam turbine.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A steam inlet device for a steam turbine includes: a U-shaped steam inlet pipe and a driving component. A first regulating valve is fixed to each opening of the steam inlet pipe. A first blade is rotatably connected to the first regulating valve through a first deflection shaft. The driving component can synchronously drive the deflection angle of the first blades in the two first regulating valves. The steam inlet pipe converges at the bottom and is connected to the steam chamber of the steam turbine through a main pipe. The main pipe is also provided with an electrically controlled second regulating valve. A plurality of adjacent second blades are rotatably connected to the second regulating valve. The plurality of second blades deflect together through a synchronizing component.

[0008] Furthermore, the driving component includes a servo dual-axis motor, a linkage assembly, a connecting plate, and an angle adjustment shaft. The connecting plate has bearing seats fixed at both ends, and the angle adjustment shaft is rotatably connected to the bearing seats at both ends. Both ends are exposed outside the bearing seats and are coaxially fixed with the first deflection shaft. The linkage assembly can convert the rotation of the servo dual-axis motor into the limiting rotation of the angle adjustment shaft.

[0009] Furthermore, the linkage assembly includes two, each corresponding to each open pipe. Each linkage assembly includes an eccentric wheel, an eccentric block, a first hinge rod, and a second hinge rod. The center of the eccentric wheel is fixed to the servo dual-axis motor. The eccentric block is fixedly connected to the eccentric part on the back of the eccentric wheel. One end of the first hinge rod is fixed to the output end of the servo dual-axis motor, and the other end is hinged to the second hinge rod. The second hinge rod is sleeved and fixed to the angle adjustment shaft.

[0010] Furthermore, the first blade is circular, and the diameter of the first blade corresponds to the inner diameter of the steam inlet pipe.

[0011] Furthermore, the diameter of the main pipeline is set to be larger than the diameter of the steam inlet pipeline.

[0012] Furthermore, the second regulating valve includes three second blades, each of which is rotatably connected to the main pipe via a second deflection shaft.

[0013] Furthermore, the synchronizing component includes a fixed outer frame, a swing rod, and a synchronizing rod. The fixed outer frame is segmented and mounted on the outer wall of the main pipe. Both ends of the second deflection shaft are connected to the bearings of the fixed outer frame. One section of the second deflection shaft is exposed outside the fixed outer frame and fixed to the bottom of the swing rod. The tops of the three swing rods are sequentially hinged together by the synchronizing rod. The second deflection shaft in the middle position is driven to rotate by an electronically controlled deceleration mechanism.

[0014] Furthermore, the three second blades are sequentially connected to form a circular plate structure, the diameter of which corresponds to the inner diameter of the main pipe.

[0015] Furthermore, the first adjusting valve opening amplitude corresponds to the second adjusting valve opening amplitude.

[0016] Compared to existing technologies, the advantages of this invention are as follows: This invention utilizes a first regulating valve and a second regulating valve to regulate the air volume by corresponding to the dual-circuit steam inlet pipe and the main pipe entering the steam chamber after converging, thereby gradually reducing throttling losses and achieving a more uniform steam intake method and higher steam intake efficiency. Similarly, the two valves are controlled independently, and the opening amplitude of the first regulating valve corresponds servo-to-valve with that of the second regulating valve. That is, under high-power operation, synchronous opening can be maximized to avoid throttling losses. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the steam inlet device in this invention; Figure 2 This is a left view of the steam inlet device in this invention; Figure 3This is a right view of the steam inlet device in this invention; Figure 4 This is a schematic diagram of the internal structure of the first regulating valve in the steam intake device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the second regulating valve in the steam intake device of the present invention.

[0018] In the diagram: 1. Steam inlet pipe; 2. Main pipe; 3. First regulating valve; 4. First deflection shaft; 5. First vane; 6. Second regulating valve; 7. Second vane; 8. Servo dual-axis motor; 9. Connecting rod assembly; 10. Connecting plate; 11. Angle adjusting shaft; 12. Bearing seat; 13. Eccentric wheel; 14. Eccentric block; 15. First hinge rod; 16. Second hinge rod; 17. Fixed outer frame; 18. Swing rod; 19. Synchronizing rod. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] like Figures 1-5 As shown, in this embodiment, a steam inlet device for a steam turbine includes a U-shaped steam inlet pipe 1 and a driving component. A first regulating valve 3 is fixed to each opening of the steam inlet pipe 1. A first blade 5 is rotatably connected to the first regulating valve 3 through a first deflection shaft 4. The driving component can synchronously drive the deflection angle of the first blades 5 in the two first regulating valves 3. The steam inlet pipe 1 is connected to the steam chamber of the steam turbine through a main pipe 2 after the bottom of the steam pipe 1 converges. The main pipe 2 is also provided with an electrically controlled second regulating valve 6. A plurality of adjacent second blades 7 are rotatably connected to the second regulating valve 6. The plurality of second blades 7 deflect together through a synchronizing component.

[0021] With the above structure, for the turbine inlet circuit of a dual-loop system, this invention avoids the problems of large throttling losses and low steam inlet efficiency caused by traditional valve control. It utilizes a first regulating valve 3 in conjunction with a second regulating valve 6 to regulate the steam volume of the inlet pipe 1 of the dual-loop system and the main pipe 2 that enters the steam chamber after converging. This gradually reduces throttling losses and achieves a more uniform steam inlet, resulting in higher steam inlet efficiency. Similarly, the two valves are controlled independently, and the opening amplitude of the first regulating valve 3 corresponds servo-to-valve with the opening amplitude of the second regulating valve 6. That is, under high-power operation, the opening can be maximized synchronously to avoid throttling losses.

[0022] The specific implementation structure for the two valve control adjustments is as follows: Figure 1 and Figure 4As shown, the driving component includes a servo dual-axis motor 8, a linkage group 9, a connecting plate 10, and an angle adjustment shaft 11. The connecting plate 10 has bearing seats 12 fixed at both ends. The angle adjustment shaft 11 is rotatably connected to the bearing seats 12 at both ends, and both ends are exposed outside the bearing seats 12 and coaxially fixed with the first deflection shaft 4. The linkage group 9 can convert the rotation of the servo dual-axis motor 8 into the limiting rotation of the angle adjustment shaft 11.

[0023] The linkage transmission process can take many forms; in this embodiment, such as... Figure 1 As shown, the linkage group 9 includes two, each corresponding to one of the open pipes. Each linkage group 9 includes an eccentric wheel 13, an eccentric block 14, a first hinge rod 15, and a second hinge rod 16. The center of the eccentric wheel 13 is fixed to the servo dual-axis motor 8. The eccentric block 14 is fixedly connected to the eccentric part of the back of the eccentric wheel 13. One end of the first hinge rod 15 is fixed to the output end of the servo dual-axis motor 8, and the other end is hinged to the second hinge rod 16. The second hinge rod 16 is sleeved and fixed to the angle adjustment shaft 11.

[0024] After the servo dual-axis motor 8 outputs rotation, it drives the eccentric block 14 to rotate eccentrically on the eccentric wheel 13. The first hinge rod 15, which swings synchronously with it, can drive the angle adjustment shaft 11 to deflect at a certain angle, corresponding to the opening amplitude of the first blade 5, under the hinge action of the second hinge rod 16. The angle adjustment shaft 11 itself has a symmetrical structure and can synchronously drive the valve blades in the other opening pipe, achieving unified air volume regulation in both circuits, ensuring stability and reliability. In actual design, the first blade 5 can be designed as a circle, with its diameter corresponding to the inner diameter of the steam inlet pipe 1.

[0025] For the main pipe 2, since it is designed to fit the turbine chamber, its diameter is generally larger than that of the main pipe 2 and the steam inlet pipe 1. Considering the large-diameter steam inlet adjustment requirements, this invention does not continue to use the single-blade deflection adjustment method, but instead uses three second blades 7 to form a circular plate structure after being connected in sequence. The diameter of this circular plate structure corresponds exactly to the inner diameter of the main pipe 2.

[0026] Each of the second blades 7 is rotatably connected to the main pipe 2 via a second deflection shaft. The synchronous deflection of the three second blades 7 is actually achieved by driving the second deflection shaft through a synchronizing element, such as... Figure 1 and Figure 5As shown, specifically, the synchronizing component includes a fixed outer frame 17, a swing rod 18, and a synchronizing rod 19. The fixed outer frame 17 is segmented and mounted on the outer wall of the main pipe 2. Both ends of the second deflection shaft are connected to the bearings of the fixed outer frame 17. One section of the second deflection shaft is exposed outside the fixed outer frame 17, and the exposed section is fixed to the bottom of the swing rod 18. The tops of the three swing rods 18 are sequentially hinged together by the synchronizing rod 19. The second deflection shaft in the middle position is driven to rotate by an electronically controlled deceleration mechanism.

[0027] After the second deflection shaft in the middle position is rotated by the external geared motor, it can drive the swing rod 18 fixed thereto to swing. The tops of the three swing rods 18 are hinged in sequence by the three synchronous rods 19 to form a parallelogram-like structure. After the swing rod 18 in the middle position swings, it can drive the other two swing rods 18 to swing together, so as to realize the synchronous angle rotation of the three second deflection shafts. That is, the three second blades 7 can flip synchronously. The three second blades 7 are adjacent to each other. After flipping, there will be a corresponding gap between the adjacent second blades 7. The size of the gap is linked to the deflection angle of the second deflection shaft, so as to realize the steam intake adjustment of the second regulating valve 6.

[0028] In actual operation, the two regulating valves are servo-corresponding, that is, they are synchronously adjusted to increase or decrease, so that the intake circuit of the dual circuit is adjusted in stages, and the adjustment process corresponds to each other. The throttling loss at the valve is reduced, the intake is more homogenized, which is conducive to improving the jet efficiency of the subsequent nozzle chamber.

[0029] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A steam inlet device for a steam turbine, characterized in that, include: The U-shaped steam inlet pipe and the driving component are provided. Each opening of the steam inlet pipe is fixed with a first regulating valve. A first blade is rotatably connected to the first regulating valve through a first deflection shaft. The driving component can synchronously drive the deflection angle of the first blades in the two first regulating valves. After the steam flows into the bottom of the steam inlet pipe, it is connected to the steam chamber of the steam turbine through the main pipe. The main pipe is also provided with an electrically controlled second regulating valve. Multiple adjacent second blades are rotatably connected to the second regulating valve. The multiple second blades deflect together through a synchronizing component.

2. The steam inlet device for a steam turbine according to claim 1, characterized in that: The driving component includes a servo dual-axis motor, a linkage assembly, a connecting plate, and an angle adjustment shaft. The connecting plate has bearing seats fixed at both ends. The angle adjustment shaft is rotatably connected to the bearing seats at both ends, and both ends are exposed outside the bearing seats and coaxially fixed with the first deflection shaft. The linkage assembly can convert the rotation of the servo dual-axis motor into the limiting rotation of the angle adjustment shaft.

3. A steam inlet device for a steam turbine according to claim 2, characterized in that: The linkage assembly includes two, each corresponding to one of the open pipes. Each linkage assembly includes an eccentric wheel, an eccentric block, a first hinge rod, and a second hinge rod. The center of the eccentric wheel is fixed to the servo dual-axis motor. The eccentric block is fixedly connected to the eccentric part on the back of the eccentric wheel. One end of the first hinge rod is fixed to the output end of the servo dual-axis motor, and the other end is hinged to the second hinge rod. The second hinge rod is sleeved and fixed to the angle adjustment shaft.

4. A steam inlet device for a steam turbine according to any one of claims 1-3, characterized in that: The first blade is circular, and the diameter of the first blade corresponds to the inner diameter of the steam inlet pipe.

5. A steam inlet device for a steam turbine according to claim 1, characterized in that: The diameter of the main pipeline is larger than that of the steam inlet pipeline.

6. A steam inlet device for a steam turbine according to claim 5, characterized in that: The second regulating valve includes three second blades, each of which is rotatably connected to the main pipe via a second deflection shaft.

7. A steam inlet device for a steam turbine according to claim 6, characterized in that: The synchronizing component includes a fixed outer frame, a swing rod, and a synchronizing rod. The fixed outer frame is segmented and mounted on the outer wall of the main pipeline. Both ends of the second deflection shaft are connected to the bearings of the fixed outer frame. One section of the second deflection shaft is exposed outside the fixed outer frame and fixed to the bottom of the swing rod. The tops of the three swing rods are sequentially hinged together by the synchronizing rod. The second deflection shaft in the middle position is driven to rotate by an electronically controlled deceleration mechanism.

8. A steam inlet device for a steam turbine according to claim 6, characterized in that: The three second blades are sequentially connected to form a circular plate structure, the diameter of which corresponds to the inner diameter of the main pipe.

9. A steam inlet device for a steam turbine according to claim 1, characterized in that: The first regulating valve opening amplitude corresponds to the second regulating valve opening amplitude.

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