CN-122014363-A - Steam inlet device for steam turbine

Abstract

The invention discloses a steam inlet device for a steam turbine, and belongs to the technical field of steam turbines. The invention relates to a steam inlet device, which comprises a U-shaped steam inlet pipeline and a driving piece, wherein a first adjusting valve is fixed corresponding to each opening pipeline of the steam inlet pipeline, a first blade is rotationally connected in the first adjusting valve through a first deflection shaft, the driving piece 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 a steam turbine chamber through a main pipeline after converging, a second adjusting valve driven by electric control is further arranged on the main pipeline, a plurality of adjacent second blades are rotationally connected on the second adjusting valve, and the second blades are deflected together through a synchronizing piece.

Inventors

• GAO GUODONG
• Yang Chuangyang
• ZHANG LIYOU
• PENG YI

Assignees

• 中国华电集团贵港发电有限公司

Dates

Publication Date

20260512

Application Date

20260407

Claims (9)

1. 1. A steam inlet device for a steam turbine is characterized by comprising a U-shaped steam inlet pipeline and a driving piece, wherein a first adjusting valve is fixed corresponding to each opening pipeline of the steam inlet pipeline, first blades are connected in the first adjusting valve through a first deflection shaft in a rotating mode, the driving piece 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 steam turbine through a main pipeline after converging, a second adjusting valve driven by electric control is further arranged on the main pipeline, a plurality of adjacent second blades are connected in a rotating mode, and the second blades deflect together through a synchronizing piece.
2. 2. The steam inlet device for a steam turbine according to claim 1, wherein the driving member comprises a servo double-shaft motor, a connecting rod group, a connecting plate and an angle adjusting shaft, bearing seats are fixed at two ends of the connecting plate, two ends of the angle adjusting shaft are rotatably connected in the bearing seats, the two ends of the angle adjusting shaft are coaxially fixed with the first deflection shaft after being exposed out of the bearing seats, and the connecting rod group can convert rotation of the servo double-shaft motor into limit rotation of the angle adjusting shaft.
3. 3. The steam inlet device for a steam turbine according to claim 2, wherein the connecting rod group comprises two connecting rods which respectively correspond to each opening pipeline, each connecting rod group comprises an eccentric wheel, an eccentric block, a first hinging rod and a second hinging rod, the center of the eccentric wheel is fixed with the servo double-shaft motor, the eccentric block is fixedly connected with the eccentric position on the back of the eccentric wheel, one end of the first hinging rod is fixed with the output end of the servo double-shaft motor, the other end of the first hinging rod is hinged with the second hinging rod, and the second hinging rod is fixedly sleeved with the angle adjusting shaft.
4. 4. A steam inlet device for a steam turbine according to any one of claims 1 to 3, wherein the first blade has a circular shape, and the diameter of the first blade corresponds to the inner diameter of the steam inlet pipe.
5. 5. A steam inlet device for a steam turbine as set forth in claim 1, wherein the main pipe is larger in diameter than the steam inlet pipe.
6. 6. A steam inlet device for a steam turbine as set forth in claim 5, wherein said second damper comprises three of said second blades, each of said second blades being rotatably coupled within said main duct via a second yaw axis.
7. 7. The steam inlet device for the steam turbine according to claim 6, wherein the synchronizing member comprises a fixed outer frame, a swinging rod and a synchronizing rod, the fixed outer frame is erected on the outer wall of the main pipeline in a segmented mode, two ends of the second deflection shaft are connected with bearings of the fixed outer frame, one section of the second deflection shaft is exposed out of the fixed outer frame and is fixed with the bottom of the swinging rod, the tops of the three swinging rods are hinged into a whole in sequence through the synchronizing rod, and the second deflection shaft in the middle position is driven to rotate through electric control speed reduction.
8. 8. A steam inlet device for a steam turbine as set forth in claim 6, wherein three of said second blades are sequentially adjacent to each other to form a circular plate structure having a diameter corresponding to an inner diameter of said main pipe.
9. 9. A steam inlet device for a steam turbine as set forth in claim 1, wherein the first modulated valve opening magnitude corresponds to the second modulated valve opening magnitude servo.

Description

Steam inlet device for steam turbine Technical Field The invention relates to the technical field of steam turbines, in particular to a steam inlet device for a steam turbine. Background The turbine is a precise rotary power machine, and its main body structure is mainly divided into two large portions of static portion (stator) and rotating portion (rotor). The two parts are matched with each other to jointly complete the task of converting steam heat energy into mechanical energy. In the traditional steam inlet mode, the throttle adjustment of the steam is generally that all the steam is adjusted in a main steam pipeline loop through one or more adjusting valves which are opened and closed simultaneously and then enters a nozzle chamber of the full-circle steam inlet, and the mode has the following limitations that firstly, the structure is simpler, the throttle loss is larger when the system runs under low load, and the steam inlet efficiency is indirectly influenced; secondly, only can adjust to the main steam pipe of single return circuit, the suitability is lower. For this purpose, we propose a steam inlet device for a steam turbine to solve the above-mentioned problems. Disclosure of Invention In view of the foregoing problems of the prior art, an object of the present invention is to provide a steam inlet device for a steam turbine. In order to solve the problems, the technical scheme adopted by the invention is as follows: A steam inlet device for a steam turbine comprises a U-shaped steam inlet pipeline and a driving piece, wherein a first adjusting valve is fixed on each opening pipeline of the steam inlet pipeline correspondingly, first blades are connected in the first adjusting valve through a first deflection shaft in a rotating mode, the driving piece can synchronously drive deflection angles of the first blades in the two first adjusting valves, the bottom of the steam inlet pipeline is communicated with the steam turbine through a main pipeline after converging, a second adjusting valve driven by electric control is further arranged on the main pipeline, a plurality of adjacent second blades are connected in a rotating mode, and the second blades deflect together through a synchronizing piece. Further, the driving piece comprises a servo double-shaft motor, a connecting rod group, a connecting plate and an angle adjusting shaft, wherein bearing seats are fixed at two ends of the connecting plate, two ends of the angle adjusting shaft are rotatably connected in the bearing seats, two ends of the angle adjusting shaft are exposed out of the bearing seats and then are coaxially fixed with the first deflection shaft, and the connecting rod group can convert rotation of the servo double-shaft motor into limit rotation of the angle adjusting shaft. Further, the connecting rod group includes two and corresponds each opening pipeline respectively, and each the connecting rod group includes eccentric wheel, eccentric block, first articulated lever and second articulated lever, the eccentric wheel center with servo biax motor is fixed, the eccentric block with eccentric department fixed connection in eccentric wheel back, first articulated lever one end with servo biax motor output is fixed, the other end with the second articulated lever is articulated, the second articulated lever with angle adjustment axle sleeve is established fixedly. Further, the first blade is circular, and the diameter of the first blade corresponds to the inner diameter of the steam inlet pipeline. Further, the pipe diameter of the main pipeline is larger than that of the steam inlet pipeline. Further, the second regulating valve comprises three second blades, and each second blade is rotatably connected in the main pipeline through a second deflection shaft. Further, the synchronizing piece includes fixed outer frame, swinging arms and synchronizing lever, fixed outer frame segmentation is erect on the trunk line outer wall, second deflection axle both ends all with fixed outer frame bearing connection, second deflection axle one section exposes fixed outer frame sets up, and expose one section with the swinging arms bottom is fixed, and three the swinging arms top is passed through the synchronizing lever articulates in proper order and connects as an organic wholely, and the intermediate position the second deflection axle passes through automatically controlled speed reduction drive and rotates. Further, the three second blades are sequentially adjacent to form a circular sheet structure, and the diameter of the circular sheet structure corresponds to the inner diameter of the main pipeline. Further, the first modulated valve opening magnitude corresponds to the second modulated valve opening magnitude servo. Compared with the prior art, the invention has the beneficial effects that the air quantity is adjusted by utilizing the first adjusting air valve to be matched with the second adjusting air valve to respectively c