CN211314285U - High-efficient steam turbine of biomass power generation - Google Patents

Abstract

The utility model relates to a biomass power generation high-efficiency steam turbine, which comprises a high-pressure bearing box, a rotor assembly, a high-pressure shaft seal, various valves, a high-pressure cylinder, holding rings at all levels, a pumping cylinder, a low-pressure shaft seal, a steam exhaust cylinder and a low-pressure bearing box; the inner hole of the high-pressure shaft seal is embedded with a plurality of circles of steam-blocking sheets, the rotor assembly is correspondingly embedded with the rotor steam-blocking sheets, and the high-pressure shaft seal is provided with a steam outlet and a steam inlet with the inlet pressure larger than the front-side atmospheric pressure and the rear-side residual steam pressure; the low-pressure shaft seal is arranged in the end hole of the exhaust cylinder in the same structure as the high-pressure shaft seal; each holding ring is provided with a static blade ring group formed by a plurality of static blade rings, and the rotor assembly is correspondingly provided with a moving blade ring group formed by a plurality of moving blade rings which are inserted between the static blade rings in a matching way; the free ends of the outer edges of the static blades and the moving blades are arranged to be concave-convex surfaces, and the steam-resistant blades are correspondingly embedded on the outer circles of the rotor assembly and the holding rings at all levels. The utility model has the advantages of little, the high efficiency of gland sealing air leakage, high rotational speed, quick start and the heat energy conversion rate is high.

Description

High-efficient steam turbine of biomass power generation

Technical Field

The utility model relates to a steam turbine technical field especially relates to a high-efficient steam turbine of biomass power generation.

Background

The steam turbine is the main equipment of thermal power factory, according to the environmental protection policy, restriction policies such as "big pressure is little" are carried out to thermal power plant to the present country. The biomass power generation turbine unit takes agriculture and forestry biomass resources and urban household garbage resources as fuels, and pushes equipment matched with a high-efficiency turbine for heat supply, power generation and other industrial steam. The waste incineration cogeneration is an important means for harmless treatment of urban household garbage, and the biomass power generation steam turbine unit has the characteristics of full utilization of green, low carbon, cleanness, renewability and the like of biomass resources, and has important significance for vigorously developing biomass energy sources to replace part of fossil energy consumption, promoting energy conservation and emission reduction and improving energy supply guarantee capability.

However, the existing domestic steam turbines for biomass generally have the defects that the thermal efficiency is lower than 80%, the steam seal air leakage is large, the heat energy conversion rate is low, impulse type blades are adopted to push a rotor, the steam inlet amount is controlled by each regulating valve, the rotating speed is low, and the like, so that the domestic steam turbines cannot be popularized generally.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a high-efficient steam turbine of biomass power generation has that the gland sealing air leakage is little, high efficiency, high rotational speed, quick start and the high advantage of heat energy conversion rate.

The technical scheme adopted by the utility model is that: a biomass power generation high-efficiency steam turbine comprises a high-pressure cylinder and a steam exhaust cylinder which are arranged separately and are inserted in front and back in a transverse penetrating manner, and a rotor assembly transversely penetrates through the high-pressure cylinder and the steam exhaust cylinder; the front end of the rotor assembly extends out of the high-pressure cylinder and is provided with a high-pressure bearing box, the rear end of the rotor assembly extends out of the exhaust cylinder and is provided with a low-pressure bearing box, a high-pressure shaft seal is arranged at the matching position of the rotor assembly and the high-pressure cylinder, and a low-pressure shaft seal is arranged at the matching position of the rotor assembly and the exhaust cylinder; an axial thrust balancer, a steam guide controller, a first-stage holding ring, a pumping cylinder, a second-stage holding ring and a third-stage holding ring are sequentially arranged in the high-pressure cylinder from front to back; the upper cylinder of the high-pressure cylinder is provided with a high-pressure main steam valve for guiding steam to enter the steam turbine, a steam outlet hole of the high-pressure main steam valve is connected with a high-pressure main steam regulating valve which is fixed on the upper cylinder of the high-pressure cylinder and is communicated with a steam inlet of the guide controller, and the steam extraction cylinder is provided with a steam extraction regulating valve;

the high-pressure shaft seal comprises an upper shaft seal and a lower shaft seal which are arranged in a split manner, the upper shaft seal and the lower shaft seal are respectively inserted into a convex ring which is preset in an end hole of the high-pressure cylinder through a ring groove structure of an excircle, and the upper shaft seal and the lower shaft seal are fixedly connected through a positioning locking assembly; the inner hole of the high-pressure shaft seal is embedded with a plurality of circles of steam-blocking sheets, the rotor assembly is correspondingly embedded with rotor steam-blocking sheets which are in cross fit with the steam-blocking sheets of the high-pressure shaft seal to form a labyrinth steam seal, and the high-pressure shaft seal is provided with a steam outlet and a steam inlet of which the inlet pressure is greater than the front-side atmospheric pressure and the rear-side residual steam pressure;

the low-pressure shaft seal is provided with a split arrangement which is the same as that of the high-pressure shaft seal and is arranged in an end hole of the exhaust cylinder in the same structure, a plurality of concave-convex steam seal grooves are formed in an inner hole of the low-pressure shaft seal, rotor steam blocking sheets which are inserted into the concave-convex steam seal grooves and matched with the concave-convex steam seal grooves to form labyrinth steam seals are correspondingly embedded in a rotor assembly, and a steam outlet and a steam inlet of which the inlet pressure is greater than the residual steam pressure at the front side and the atmospheric pressure at the rear side are;

the first-stage retaining ring, the second-stage retaining ring and the third-stage retaining ring are all provided with a static blade ring group consisting of a plurality of static blade rings, and the rotor assembly is correspondingly provided with a moving blade ring group consisting of a plurality of moving blade rings which are inserted between the static blade rings in a matching way; the static blade ring is composed of a plurality of static blades which are uniformly distributed along the circumferential direction, inserted through inverted T-shaped ends arranged at the root part and tightly pressed in a pre-opened ring groove arranged on each holding ring, the free ends of the outer edges of the static blades are arranged to be concave-convex surfaces relative to the end surface of the rotor assembly, and steam-resistant blades with different heights and pointing to the concave-convex surfaces in the radial direction are embedded in the excircle of the rotor assembly corresponding to the free ends of the static blades; the movable blade ring is composed of a plurality of movable blades which are uniformly distributed along the circumferential direction, inserted through T-shaped ends arranged at the root part and tightly pressed in a ring groove pre-arranged on the rotor assembly, the free end of the outer edge of each movable blade is arranged to be a concave-convex surface relative to the end surface of each holding ring, and the steam-resistant sheets with different heights matched with the concave-convex surfaces are embedded on the inner hole of each holding ring corresponding to the free end of the outer edge of each movable blade.

As a further limitation to the above technical solution, a high-pressure oil slinger is installed at the matching position of the end hole at the rear end of the high-pressure bearing box and the rotor assembly; the high-pressure oil slinger comprises an upper ring body and a lower ring body which are arranged in a split manner, the upper ring body and the lower ring body are respectively inserted into a ring groove which is pre-arranged in an end hole of the high-pressure bearing box through a convex ring structure of an excircle, and the upper ring body and the lower ring body are fixedly connected through a positioning and locking assembly; the inner hole of the high-pressure oil retainer ring is provided with a plurality of rings of oil retaining teeth which are separated from each other at intervals, and the excircle of the rotor assembly is correspondingly provided with a plurality of rings of blocking ribs which are inserted and matched between the oil retaining teeth; the end surface of the blocking rib, which corresponds to one side inside the high-pressure bearing box, is a vertical surface for blocking the flow of hydraulic oil, and the end surface of the blocking rib, which corresponds to one side outside the high-pressure bearing box, is an inclined surface inclined downwards so as to guide the hydraulic oil conveniently and quickly in a backflow manner; the upper ring body is provided with a steam inlet, and the lower ring body is provided with an oil return groove communicated to the inside of the high-pressure bearing box; and the end holes at the two ends of the low-pressure bearing box are provided with low-pressure oil slingers with the same structural function as the high-pressure oil slingers.

As a further limitation to the above technical solution, an outer end port of the high-pressure oil slinger is fixedly connected with a thermal baffle, and the thermal baffle comprises at least two layers of aluminum alloy plates separated by a set distance through a spacer.

As a further limitation to the above technical solution, the matching diameters of the first-stage holding ring, the second-stage holding ring and the third-stage holding ring and the rotor assembly are sequentially increased, the matching diameter of the same holding ring and the rotor assembly is gradually increased from the front end to the rear end, the root cross sections of the last-stage moving blade ring and the last-stage moving blade ring on the side of the third-stage holding ring close to the exhaust cylinder are double-T-shaped ends connected in series up and down, the cross section of the ring groove formed in the rotor assembly is a corresponding double-T-shaped groove, and the moving blades in the last-stage moving blade ring group and the last-stage moving blade ring group.

As a further limitation to the above technical solution, the left and right sides of the bottom surface of the front end of the high pressure cylinder and the left and right sides of the bottom surface of the rear end of the exhaust cylinder are both provided with positioning grooves having ejection bolt holes, and a bracket of the steam turbine is provided with corresponding bosses; the rear end of the exhaust cylinder is fixedly connected with the bracket through a fixed port, and the front end of the high-pressure cylinder is provided with a moving port flexibly connected with the bracket.

As a further limitation to the above technical solution, the upper cylinder of the high pressure cylinder is provided with a sensor for acquiring the temperature and pressure of the thrust balancer, the first-stage holding ring, the second-stage holding ring and the third-stage holding ring; and a sensor for collecting temperature and pressure is arranged on the surface of the rear end of the exhaust cylinder.

As a further limitation to the above technical solution, a lower shaft seal of the high-pressure shaft seal is provided with a steam inlet and a steam outlet, the steam inlet is located at the rear side of the steam outlet, the steam inlet is communicated with the inside of the high-pressure cylinder through a steam inlet pipe, and a second steam outlet is provided below the lower cylinder of the high-pressure cylinder corresponding to the rear side of the high-pressure shaft seal; and the steam inlet of the low-pressure shaft seal is positioned at the front side of the lower half structure, the steam outlet is positioned at the rear side of the upper half structure, and the steam inlet is communicated with the front end of the steam exhaust cylinder through a third steam inlet pipe.

In a further limitation of the above aspect, the stationary blades of the stationary blade ring set, the moving blades of the moving blade ring set, and the blades in the guide controller are all reaction type blades.

As a further limitation to the above technical solution, a water inlet nozzle for jetting water into the interior of the exhaust cylinder is provided at an outer circumference of a connection position of the exhaust cylinder and the high pressure cylinder.

As a further limitation to the above technical solution, the lower cylinder of the high pressure cylinder is provided with a drain opening corresponding to the axial thrust balancer, the second-stage holding ring and the third-stage holding ring.

Adopt above-mentioned technique, the utility model has the advantages of:

the utility model discloses a high-efficient steam turbine is used in biomass power generation to agriculture and forestry biomass resources and cities and towns domestic waste resource are fuel, are used for promoting supporting high-efficient steam turbine heat supply, electricity generation and other industrial steam. The utility model discloses rated revolution can be up to 7500r/min, through the gear box deceleration that sets up outside the steam exhaust cylinder to 3000 r/min. The enthalpy drop distribution is more uniform, and the output efficiency is as high as 91.2%.

The utility model discloses a modular design, high pressure bearing case module has been arranged in proper order backward in the past, high pressure bearing seal module, high pressure main steam valve module, high pressure main vapour governing valve module, high pressure cylinder module, axial thrust balancer module, steam direction controller module, the ring module is held to the one-level, the governing valve module of drawing vapour, the cylinder module of drawing vapour, the ring module is held to the second grade, the ring module is held to the third grade, rotor assembly module, the exhaust cylinder module, low pressure bearing seal module, key module portion covers such as low pressure bearing case module, each module both can independently install in advance, can be organic equipment again for a whole, it is good to have guaranteed this unit adaptability through the above-mentioned reasonable static module and rotation module that sets up, the performance parameter that has realized this steam turbine quick start and frequent start in one hour.

The utility model discloses high pressure bearing box sets up at the rotor assembly front end, and inside is provided with thrust axle bush, radial axle bush, the three fractional sleeve of high-pressure oil slinger. The thrust bearing bush is used for bearing the axial force of the rotor assembly and ensuring oil feeding lubrication and cooling under the working condition of high-speed rotation of the rotor. The radial bearing bush is used for bearing the radial force of the rotor assembly and ensuring oil feeding lubrication and cooling under the working condition of high-speed rotation of the rotor. The high-pressure oil retainer ring is arranged on the right side of the high-pressure bearing box, and hydraulic oil in the high-pressure bearing box is prevented from leaking outside under the high-speed rotation working condition of the rotor.

The utility model discloses both ends are not leaked outward for guaranteeing steam around the high-pressure cylinder, are provided with high-pressure bearing seal module and low pressure bearing seal module respectively. The outer circle of the high-pressure shaft seal module is erected at the front end of the high-pressure cylinder, the inner diameter of the high-pressure shaft seal module is provided with the steam blocking sheets which are densely distributed and arranged, and the high-pressure shaft seal module is sleeved on the diameter of a rotor shaft provided with the steam blocking sheets to form a labyrinth type steam seal set, so that high-temperature steam at the position cannot leak outwards. The outer circle of the low-pressure shaft seal module is erected at the end of the exhaust cylinder, and a concave-convex steam seal groove arranged on the inner diameter and a steam blocking sheet arranged on the shaft diameter of the rotor form a labyrinth type steam seal group, so that high-temperature steam at the position cannot leak outwards.

The utility model discloses high-pressure main vapour valve module and high-pressure main vapour governing valve module are installed to high-pressure cylinder upper casing. The high-pressure main steam valve module is used for controlling the on-off function of steam, and a steam outlet of the high-pressure main steam valve module can be directly connected with a steam inlet of the high-pressure main steam regulating valve. The high-pressure main steam regulating valve is of a combined steam valve structure, and three independently controlled regulating valves are mounted in a valve body, so that the high-pressure main steam regulating valve is small in size and flexible and convenient to operate. And the valve seats of all the valves adopt a cold-assembly interference fit installation technology, and have the functions of being detachable and replaceable, so that the maintenance efficiency is high, and the maintenance cost is low.

The utility model discloses steam direction controller is provided with three steam inlet, can correspond with the three steam outlet that high pressure main vapour governing valve set up respectively and be connected, adopts cartridge technology installation series reaction formula blade type blade in, can lead the back expansion work to the steam that gets into.

The utility model discloses the ring is held to one-level and the reaction type moving blade of cartridge forms the blading on the reaction type stationary blade of internal diameter cartridge and the rotor assembly, and steam all acts in the sound blade, all can produce the enthalpy drop, and efficient. According to actual needs, the steam after doing work can extract residual steam through a steam extraction port arranged on the lower cylinder of the high-pressure cylinder for other industrial production.

The utility model discloses steam extraction governing valve and steam extraction jar setting are held at the one-level and are held between the ring and the second grade. The steam extraction regulating valve is arranged on the upper cylinder surface of the high-pressure cylinder, can regulate the steam extraction amount according to the load requirement, has the same structure of a combined steam valve, is provided with three regulating valves which are independently controlled, and has small volume and convenient operation. The valve seat that inside set up all adopts cold charge interference fit installation technique, has can dismantle, removable advantage, and maintenance efficiency is high, and cost of maintenance is low. The three inlets of the steam extraction cylinder are connected with three steam outlets of the steam extraction regulating valve, the steam extraction cylinder is arranged in the high-pressure cylinder and sleeved on a shaft shoulder of the rotor assembly, and a concave-convex steam seal groove arranged in an inner hole of the steam extraction cylinder and a steam blocking sheet arranged at the shaft shoulder of the rotor form a labyrinth type steam seal group, so that high-temperature steam at the position cannot leak outwards.

The utility model discloses the second grade is held ring, tertiary and is held ring and install inside high pressure cylinder, and its inner hole all adopts inverted trapezoid groove root form cartridge to have reaction type stator blade, constitutes to the blading together through the reaction type rotor blade with cartridge on the rotor assembly, and steam all does work in the sound blade, all can produce the enthalpy drop, and efficient. The top ends of the dynamic and static blades are inserted with steam-stopping sheets to prevent steam from leaking out of the steam-stopping sheets and reduce the power of the unit.

The utility model discloses axial thrust balancer sets up at the rotor assembly front end, because the stationary blade of cartridge and the moving blade of rotor assembly cartridge are reaction type blade profile blade on holding the ring at different levels, therefore high-pressure steam is great to the axial positive thrust that the rotor produced, can balance this axial positive thrust through the axial thrust balancer that sets up, and can seal and step down from the high-pressure steam that steam guide controller sprays and produce axial negative thrust to the rotor.

The utility model discloses steam direction controller and holding at different levels all adopt the cartridge blade to replace traditional welding process on the ring, it is removable to have a blade, has realized the feasibility of long-term maintenance, through the cartridge blade, has reduced the assembly degree of difficulty, has guaranteed the original machining precision of body and blade. When a certain blade is damaged, the blade can be disassembled and replaced at any time, the long-term usability of the body is met, the maintenance time of a power plant is further reduced, and the maintenance cost of the power plant is reduced.

The utility model discloses low pressure bearing box sets up in the rotor assembly rear end, and inside is provided with two low pressure oil slingers and the three little portion cover of radial axle bush. The radial bearing bush is used for bearing the radial force of the rotor assembly and ensuring oil feeding lubrication and cooling under the working condition of high-speed rotation of the rotor. Two low-pressure oil slingers are arranged on two sides of the low-pressure bearing box, so that hydraulic oil in the low-pressure bearing box is prevented from leaking outside under the high-speed rotation working condition of the rotor.

The utility model discloses the jar is provided with the temperature measurement pressure tap on the high-pressure cylinder, can monitor axial thrust balancer position, one-level in proper order from the front backward and hold ring, second grade and hold ring, the tertiary relevant temperature and the pressure of holding the ring position to in the data passback unit system with gathering.

The utility model discloses the lower cylinder of high-pressure cylinder is provided with a series of drain, holds the drain of ring position and tertiary ring position for axial thrust balancer position, second grade in the past backward in proper order to each set normal work when guaranteeing the unit operation.

The utility model discloses the high-pressure cylinder is connected for whole cylinder with the exhaust casing, and high-pressure cylinder front end and exhaust casing rear end are provided with positioning groove on the horizontal direction, and the boss position at unit lower extreme bracket is installed to above-mentioned each positioning groove symmetry. The tail end of the upward-arranged cylinder in the front-back direction is provided with a fixed port and is rigidly connected and fixed with the bracket, the front end of the high-pressure cylinder is provided with a moving port and is flexibly connected and fixed with the bracket, and the high-pressure cylinder has a follow-up function when the high-temperature steam influences the forward expansion and stretching under the working state of the whole cylinder.

Drawings

FIG. 1 is a cross-sectional view of a steam turbine of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a bottom view of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 1 at A;

fig. 5 is a partially enlarged view of fig. 1 at B.

In the figure: 1-a high pressure bearing housing; 101-oil inlet hole; 102-oval tile oil inlet holes; 2-thrust bearing bush; 2001-thrust bearing bush front side end face; 2002-thrust bearing bush rear end face; 3-radial bearing bush; 31-alloy tile face; 4-high pressure oil slinger; 41-steam inlet holes; 42-oil blocking teeth; 43-oil return groove; 5-insulating board; 6-high pressure shaft seal; 61-steam outlet; 62-a steam inlet; 7-a steam inlet pipe; 8-axial thrust balancer; 81-steam exhaust hole; 82-a second steam outlet, 9-a steam guide controller; 10-adjusting the stage moving blade group; 11-a high pressure main steam valve; 12-high pressure main steam regulating valve; 13-a second steam inlet pipe; 14-a high pressure cylinder; 141-upper cylinder; 142-lower cylinder; 143-I steam extraction port; 144-J steam extraction port; 145-R hydrophobic port; 146-S hydrophobic port; 147-T hydrophobic port; 148-high pressure cylinder temperature and pressure measuring hole; 149-a roving port; 15-steam extraction regulating valve; 16-pumping cylinder; 17-primary holding ring; 18-a secondary retaining ring; 19-a tertiary holding ring; 20. a rotor assembly; 201-moving vane ring group; 202-a stationary vane ring set; 204-blade lacing wire; 205-blocking ribs; 206-a rotor-pair wheel; 21-a bank of cylinders; 211-steam exhaust; 212-a fixed port; 214-exhaust cylinder temperature and pressure measuring hole; 215-water inlet nozzle; 216-positioning grooves; 217-third inlet pipe; 22-low pressure shaft seal; 23-a low pressure slinger; 24-a low pressure bearing housing; 26-a low pressure slinger; 27-cylinder closing double bolt.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A biomass power generation high-efficiency steam turbine is shown in figures 1-5, and adopts a modular design, modules arranged in sequence from the front end to the rear end (from left to right in the figures) are a high-pressure bearing box 1, a rotor assembly 20, a high-pressure shaft seal 6, a high-pressure main steam valve 11, a high-pressure main steam regulating valve 12, a high-pressure cylinder 14, an axial thrust balancer 8, a steam guide controller 9, a first-stage holding ring 17, a steam extraction regulating valve 15, a steam extraction cylinder 16, a second-stage holding ring 18, a third-stage holding ring 19, a low-pressure shaft seal 22, a steam exhaust cylinder 21, a low-pressure bearing box 24 and the like, and the modules can be independently installed in advance and can be organically assembled into.

The high-pressure cylinder 14 and the exhaust cylinder 21 are respectively arranged in a vertically split structure, the rear end of the combined high-pressure cylinder 14 and the front end of the exhaust cylinder 21 are clamped and installed front and back through a seam allowance, and the positioned and installed high-pressure cylinder 14 and the exhaust cylinder 21 form a cavity structure which is through front and back. The middle part of the rotor assembly 20 is arranged inside the high pressure cylinder 14 and the exhaust cylinder 21, the front end of the rotor assembly 20 extends out of the high pressure cylinder and is provided with the high pressure bearing box 1, and the rear end of the rotor assembly 20 extends out of the exhaust cylinder and is provided with the low pressure bearing box 24. The rear end of the rotor assembly 20 extends out of the low-pressure bearing box and is provided with a rotor pair wheel 206 so as to connect with a high-speed shaft component to realize high-speed rotation and transmit to a rear-end reduction gearbox and a generator, thereby realizing the rotation power generation operation of the generator rotor. The high pressure shaft seal 6 is arranged at the matching position of the high pressure cylinder 14 and the rotor assembly 20, and the low pressure shaft seal 22 is arranged at the matching position of the exhaust cylinder 21 and the rotor assembly 20. An axial thrust balancer 8, a steam guide controller 9, a first-stage holding ring 17, an extraction cylinder 16, a second-stage holding ring 18 and a third-stage holding ring 19 are sequentially arranged in the high-pressure cylinder 14 from front to back. The upper cylinder of the high pressure cylinder 14 is provided with a high pressure main steam valve 11 for guiding steam to enter the steam turbine, a steam outlet hole of the high pressure main steam valve 11 is connected with a high pressure main steam regulating valve 12 which is fixed on the upper cylinder and is communicated with a steam inlet of the guide controller, and a steam extraction regulating valve 15 is arranged on the steam extraction cylinder 16.

The two half structures of the high-pressure cylinder upper cylinder 141 and the high-pressure cylinder lower cylinder 142 realize the cylinder combination fastening of the upper cylinder and the lower cylinder through the cylinder combination double bolts 27 arranged on the periphery. The surface of the upper cylinder 141 is provided with a plurality of temperature and pressure measuring holes 148, real-time temperature and pressure of the positions of the axial thrust balancer 8, the first-stage holding ring 17, the second-stage holding ring 18 and the third-stage holding ring 19 are monitored from front to back in sequence by connecting a temperature sensor and a pressure sensor, and collected signals are transmitted back to a unit system for display. The surface of the lower cylinder 142 is provided with a plurality of drainage ports, namely an R drainage port 145, an S drainage port 146 and a T drainage port 147 from front to back in sequence, so that the condensate water at the lower end of the axial thrust balancer 8, the lower end of the second-stage holding ring 18 and the lower end of the third-stage holding ring 19 is discharged in time, and the normal operation of all work pieces in the cylinder is realized. A series of water inlet nozzles 215 are arranged at the periphery and outer circle of the connecting position of the exhaust cylinder 21 and the high-pressure cylinder 14, and water is jetted to the interior of the exhaust cylinder 21 through the nozzles, so that the steam at the position in the exhaust cylinder 21 can be quickly condensed and flows to a condenser through the steam outlet 211. The left end and the right end of the right end surface of the exhaust cylinder 21 connected with the high-pressure cylinder 14 are provided with temperature and pressure measuring holes 214, and the temperature and the pressure of condensed water at the tail end of the exhaust cylinder 21 are monitored in real time by connecting a temperature sensor and a pressure sensor, and collected signals are transmitted back to a unit system for display.

The steam turbine is firmly positioned on the bracket, and is correspondingly installed with a boss arranged on the bracket through a positioning groove 216 arranged on the bottom surface of the exhaust cylinder 21 and a positioning groove 216 arranged on the bottom surface of the front end of the high pressure cylinder 14 in the horizontal direction. Each positioning groove 216 is arranged in a left-right symmetrical manner, and the groove is provided with an ejection bolt hole, through which a bolt is screwed, the high-pressure cylinder 14 and the exhaust cylinder 21 can be ejected up integrally for fine adjustment. The turbine is implemented by a fixed port 212 provided in the exhaust cylinder 21 and a floating port 149 provided at the front end of the high pressure cylinder 14 in the front-rear direction. The fixed port 212 is fixed on the bracket in a rigid connection and is not movable, and the floating port 149 is fixed at the front end of the bracket in a flexible connection and realizes the function of following along with the forward extension of the high-pressure cylinder when the high-pressure cylinder works so as to ensure the stability of the operation of the unit.

The high-pressure bearing box 1 is internally provided with a thrust bearing bush 2 and a radial bearing bush 3 which are respectively sleeved. The thrust bearing bush 2 is of an upper half structure and a lower half structure, is erected at the front end of the rotor assembly 20 and is used for bearing the axial force of the rotor assembly 20 in the working state and feeding oil for lubrication. The radial bearing bush 3 is of an upper half structure and a lower half structure, is erected on the rotor assembly 20 at the rear side of the thrust bearing bush 2, and is used for bearing the radial supporting force at the front end of the rotor assembly 20 and performing oil lubrication. The rear end of the high-pressure bearing box body 1 is matched with the rotor assembly 20 to erect the high-pressure oil retainer ring 4 with two half structures, and the high-pressure oil retainer ring is used for preventing hydraulic oil in the bearing box body from leaking outside.

Thrust pads are arranged on the front end face and the rear end face of the thrust bearing bush 2, and the thrust pads are assembled with the thrust bearing bush 2 body through dovetail groove structures. Babbit alloy is centrifugally cast on the surface of each thrust pad to realize lubrication with a rotor shaft shoulder. The cast babbitt metal has a hardness value of about HB30, which is much lower than the hardness of the mating surfaces of the rotor assembly 20 to ensure that there is no wear on the mating surfaces of the rotor assembly 20. When the rotor assembly 20 rotates, the oil supplied from the lubricating oil station enters the front end face 2001 of the thrust bearing bush and the rear end face 2002 of the thrust bearing bush through the oil inlet hole 101 formed in the body of the high-pressure bearing housing 1, and dynamic pressure oil films are established on the two faces to ensure the stability of the two faces in a working state.

The outer circle of the radial bearing bush 3 is uniformly provided with adjusting cushion blocks, and the axis of the radial bearing bush 3 is adjusted to be concentric with the axis of the rotor assembly 20 in a manner of increasing or decreasing the gaskets. The alloy tile surfaces 31 are arranged in the upper and lower whole circles of inner holes of the radial bearing bush 3 through a centrifugal casting process, the cast Babbitt metal hardness value is about HB30 and is far lower than the hardness of the shaft diameter outer circle matching surface of the rotor assembly 20, and therefore the shaft diameter outer circle matching surface is free of abrasion. When the rotor assembly 20 rotates, oil supplied by the lubricating oil station enters the alloy bush surface 31 arranged on the radial bush 3 through the oval bush oil inlet hole 102 arranged on the body of the high-pressure bearing box 1, and a dynamic pressure oil film is established on the alloy bush surface, so that the lubricating property and the rotation precision of the surface and the outer circle of the rotor shaft diameter are ensured.

The upper ring body and the lower ring body of the high-pressure oil slinger 4 are fixedly connected through a positioning and locking assembly. The upper ring body of the high-pressure oil slinger 4 and the excircle of the lower ring body are provided with convex rings, a ring groove matched with the convex rings is arranged in the right side end hole of the high-pressure bearing box 1, and the high-pressure oil slinger 4 is inserted into the end hole of the high-pressure bearing box 1 through the convex rings. The inner hole of the high-pressure oil slinger 4 is provided with a plurality of circles of oil baffle teeth 42 which are separated from each other at intervals, the oil baffle teeth 42 are designed and processed by adopting an aluminum plate material, and the distance between the oil baffle teeth 42 and the shaft diameter excircle of the rotor assembly 20 is set to be 0.35mm so as to ensure the best oil baffle function. The outer circle of the rotor assembly 20 is correspondingly provided with a plurality of circles of blocking ribs 205 which are inserted and matched between the oil blocking teeth, and the blocking ribs 205 correspond to the vertical surface of the end surface of one side inside the high-pressure bearing box and are used for blocking hydraulic oil from flowing; the end face of the blocking rib 205 corresponding to one side of the outside of the high-pressure bearing box is an inclined plane inclined downwards, so that hydraulic oil can be guided in a rapid backflow mode. The part of the right side of the upper ring body extending out of the high-pressure bearing box is provided with a radial steam inlet hole 41, and the left side of the lower ring body is provided with an oil return groove 43 communicated with the inside of the high-pressure bearing box. When the hydraulic oil in the high-pressure bearing box 1 flows to the first oil blocking tooth 42 at the front end through the blocking rib 205, the hydraulic oil can flow back to the high-pressure bearing box 1 through the oil return groove 43, and the hydraulic oil enters the space between the oil blocking teeth 42 through steam passing in the steam inlet hole 41, so that the requirement that the gas pressure between the oil blocking teeth is greater than the pressure of the oil return groove 43 is met, and further, the hydraulic oil is ensured to completely flow back under the negative pressure working condition without leakage.

In order to prevent the high-temperature heat of the steam from being conducted to the high-pressure bearing box 1 when the high-pressure cylinder 14 works, a heat insulation plate 5 is arranged between the two parts and is fixedly installed at the port of the rear end of the high-pressure oil retainer 4. The heat insulation board 5 is of a two-layer structure, and a spacer sleeve is arranged between the two layers to be separated and fixed. The heat insulation plate 5 is made of an aluminum alloy plate, and the advantage that the material absorbs heat slowly and dissipates heat quickly is utilized, so that the high-temperature heat conducted by heat is dissipated quickly to reduce the heat influence of the high temperature on the high-pressure bearing box 1.

The radial bearing bush 3 with the same structure as the high-pressure bearing box is arranged in the low-pressure bearing box 24 and used for bearing the radial supporting force at the rear end of the rotor assembly 20, feeding oil for lubrication and ensuring the rotation precision. The two ends of the low-pressure bearing box 24 are provided with end holes for penetrating through the rotor assembly 20, the end holes at the two ends are provided with low- pressure oil slingers 23 and 26 in the same structure and installation mode as the high-pressure oil slinger 4, and the low- pressure oil slingers 23 and 26 are used for preventing hydraulic oil in the bearing box from leaking outside at the positions of the two ends. When the wind turbine is installed, the low-pressure oil slinger 26 of the rear side end hole is the same as the high-pressure oil slinger 4, and the low-pressure oil slinger and the high-pressure oil slinger partially extend out of the outer side, the steam inlet hole is arranged at the extending end of the upper half structure, the front side surface corresponding to the blocking rib 205 on the rotor assembly 20 is a straight surface, and the rear side surface is an inclined surface; the low pressure oil slinger 23 in the front end hole is all located in the end hole, the low pressure bearing box 24 is provided with a steam hole communicated with the steam inlet hole, the back side corresponding to the blocking rib 205 on the rotor assembly 20 is a straight surface, and the front side is an inclined surface.

The high-pressure shaft seal 6 is used for preventing the steam at the matching part of the front end of the high-pressure cylinder 14 and the rotor assembly 20 from leaking to damage other sleeves. The high-pressure shaft seal 6 comprises an upper shaft seal and a lower shaft seal which are arranged in a split mode, and the upper shaft seal and the lower shaft seal are fixedly connected through a positioning locking assembly. The upper shaft seal and the lower shaft seal are inserted on a convex ring preset on the high-pressure cylinder 14 through a ring groove structure of an excircle. The inner hole of the high-pressure shaft seal 6 is embedded with a plurality of circles of steam-blocking sheets, the rotor assembly is correspondingly embedded with the rotor steam-blocking sheets, and the rotor steam-blocking sheets and the steam-blocking sheets of the high-pressure shaft seal are in cross fit to form a labyrinth steam seal. The designed clearance value of the high-pressure shaft seal 6 steam-blocking piece to the rotor assembly 20 is 0.8mm, and the designed clearance value of the rotor assembly 20 steam-blocking piece to the high-pressure shaft seal 6 inner hole is 0.5mm, so that the optimal function of blocking air flow is ensured. The lower shaft seal of the high-pressure shaft seal 6 is provided with a steam outlet 61 and a steam inlet 62, and the steam inlet 62 is positioned at the rear side of the steam outlet 61. The lower cylinder 142 of the high pressure cylinder is provided with a second steam outlet 82 corresponding to the lower part of the rear side of the high pressure shaft seal 6. The steam enters through the steam inlet pipe 7 connected with the high-pressure cylinder 14 and flows to the steam inlet 62, so that the steam inlet pressure is greater than the atmospheric pressure on the front side (left side in the figure) and the residual steam pressure on the rear side (right side in the figure) of the high-pressure shaft seal 6. Steam of the steam inlet 62 flows to the steam outlet 61 along the front-side multiple steam-blocking sheets and then is output to the steam exhaust pipeline through the steam outlet 61, and on the other side, steam of the steam inlet 62 flows to the second steam outlet 82 along the rear-side multiple steam-blocking sheets and then is output to the steam exhaust pipeline through the steam outlet, and finally, steam in the high-pressure cylinder 14 is prevented from leaking from the front end.

The low-pressure shaft seal 22 is used for preventing the steam at the front end of the exhaust cylinder 21 and the rotor assembly 20 from leaking to damage the low-pressure bearing box 24. The low pressure shaft seal 22 is of the same split arrangement as the high pressure shaft seal and is mounted in the exhaust cylinder in the same configuration. The inner hole of the low-pressure shaft seal 22 is provided with uneven concave-convex steam seal grooves and is superposed and matched with steam-blocking sheets embedded at the position on the rotor assembly 20 to form a labyrinth steam seal group. The distance between the steam-blocking sheets on the rotor assembly 20 and the inner hole clearance of the low-pressure shaft seal 22 is 0.5mm, so that the optimal function of blocking the air flow is ensured. An air inlet 62 is arranged at the front side of the lower half structure of the low-pressure shaft seal 22, and an air outlet 61 is arranged at the rear side of the upper half structure of the low-pressure shaft seal 22. The steam enters through the third steam inlet pipe 217 connected with the inner side of the exhaust cylinder 21 and flows to the steam inlet 62, so that the pressure of the steam inlet is greater than the pressure of the residual steam on the front side of the low-pressure shaft seal 22 and the pressure of the atmosphere on the rear side. Steam in the steam inlet 62 flows to the steam outlet 211 along the plurality of steam-blocking sheets on the front side, and steam in the steam inlet 62 flows to the steam outlet 61 along the plurality of steam-blocking sheets on the rear side and then is output to the steam exhaust pipeline through the steam outlet, so that steam in the steam exhaust cylinder 21 is finally prevented from leaking from the steam outlet.

The steam guide controller 9 controls steam admission through a high-pressure main steam valve 11, a high-pressure main steam regulating valve 12 and a second steam admission pipe 13 connected with the high-pressure main steam regulating valve 12, and performs energy conversion from heat energy to mechanical energy. The axial thrust balancer 8 is used for balancing the axial positive thrust generated by the action of the reaction type blade.

The high-pressure main steam valve 11 is provided with a steam inlet end for steam to enter, and the steam outlet end of the high-pressure main steam valve 11 is in end face sealing connection with the steam inlet end of the high-pressure main steam regulating valve 12 through a tooth-shaped gasket, so that the steam enters the high-pressure main steam regulating valve 12 from the high-pressure main steam valve 11. The two surfaces of the body of the tooth-shaped gasket are provided with a plurality of concentric sealing grooves, and the end surfaces of the two valves clamp and deform the tooth shapes arranged on the tooth-shaped gasket through bolts and nuts so as to realize good sealing. The bottom of the steam outlet port of the high-pressure main steam valve 11 is provided with a drain groove, the bottom of the steam inlet port of the high-pressure main steam regulating valve 12 is provided with a drain groove, the bottom of the inner hole of the correspondingly installed tooth-shaped pad is also provided with a drain groove, and the structure of a plurality of drain grooves arranged at the joint of the two valves meets the requirement that residual water of the two valves converges to flow to the drain pipe arranged on the body of the high-pressure main steam valve 11 and is led out.

Parts such as valve rod, disk seat all are provided with to high pressure main vapour valve 11 and high pressure main vapour governing valve 12 are inside, and the disk seat part all adopts interference fit cold charge to the valve body on, and then satisfies on line grinding sealed face or disassemble the renewal piece when overhaul, has solved the broken technological problem of tearing open of traditional disk seat that adopts the welding installation, has reduced the maintenance degree of difficulty and has improved maintenance speed. The high-pressure main steam regulating valve 12 is of a combined steam valve structure, three regulating valves which are independently controlled are installed in the body of the high-pressure main steam regulating valve 12 and are jointly built with the high-pressure main steam valve 11 to form a module which is installed on the upper portion of the upper cylinder of the high-pressure cylinder 14, so that high integration of the module is realized, and the installation space is reduced.

The steam guide controller 9 is provided with three steam inlets which are correspondingly connected with three steam outlets arranged on the high-pressure main steam regulating valve respectively, and a series of reaction type blade-shaped blades are installed in the steam guide controller by adopting a plug-in mounting process to guide, compress and expand to do work on the entering steam. After steam is introduced, the steam is guided by a reaction type blade arranged in the steam generator to be sprayed out and expanded to do work, and the conversion from heat energy to mechanical energy is realized. The rotor assembly 20 is provided with a regulating stage movable blade group 10, impulse type blades are arranged on the regulating stage movable blade group 10 in a whole circle, and a regulating stage module is formed together with the steam guide controller 9, so that the load working condition of the steam turbine is regulated.

After the steam self-regulation stage moving blade group 10 rotates to do work, one path of the steam enters the steam exhaust hole 81 arranged on the steam self-regulation stage moving blade group after being sealed and blocked by the axial thrust balancer 8, and then enters the steam extraction cylinder 16 for steam extraction. The steam exhaust holes 81 are preferably provided at a shoulder location that engages the rotor assembly 20. The inner hole of the axial thrust balancer 8 is provided with unequal number of gland rings, and the gland rings are in cross superposition fit with the steam blocking sheets embedded on the rotor assembly 20, so that the high-pressure steam sprayed from the steam guide controller 9 is ensured to be sealed and depressurized, axial negative thrust is generated on the rotor assembly 20, and the axial positive thrust generated on the rotor assembly 20 by the high-pressure steam sprayed from the steam guide controller 9 is further balanced.

The other path of the steam passes through the stationary blade ring group 202 of the first-stage retaining ring 17 and the moving blade ring group 201 correspondingly arranged on the rotor assembly 20 to do work, then enters the steam extraction port 143 of the I to be led out and used for other industrial purposes, preferably, the temperature of the output steam of the port is about 425 ℃, and the steam pressure is about 2 MPa. The residual steam enters the steam extraction cylinder 16 after being controlled by the steam extraction regulating valve 15, and is led out through a stationary blade ring group of the secondary retaining ring 18 and a moving blade ring group correspondingly arranged on the rotor assembly 20 after expansion and work done until a J steam extraction port 144 and enters a deaerator to a regenerative system. The steam which passes through the stationary blade ring set of the second-stage retaining ring 18 and the moving blade ring set corresponding to the rotor assembly 20 and does work can continue to expand and do work through the moving blade set correspondingly arranged to the third-stage retaining ring 19 and the rotor assembly 20 again, and is finally output to a steam outlet 211 arranged at the lower end of a steam exhaust cylinder 21 connected with the high-pressure cylinder 14.

The first-stage retaining ring 17, the second-stage retaining ring 18 and the third-stage retaining ring 19 are all provided with a stationary blade ring group 202 formed by a plurality of stationary blade rings, and the rotor assembly 20 is correspondingly provided with a moving blade ring group 201 formed by a plurality of moving blade rings which are matched and inserted among the stationary blade rings. The quiet blade ring by a plurality of along the circumference equipartition, through the type of falling T end cartridge that the root set up, compress tightly hold the ring on each and open the quiet blade in the ring groove in advance and constitute, quiet blade outer fringe free end sets up to the terminal surface of rotor assembly to the concave-convex face, corresponds on rotor assembly 20's the excircle quiet blade free end and inlays the steam-resistant piece that the height that radial directional concave-convex face differs. The movable blade ring is composed of a plurality of movable blades which are uniformly distributed along the circumferential direction, inserted through T-shaped ends arranged at the root part and tightly pressed in a ring groove pre-arranged on the rotor assembly, the free ends of the outer edges of the movable blades of the movable blade ring are arranged into concave-convex surfaces relative to the end surfaces of all the stages of holding rings, and steam-resistant sheets with different heights matched with the concave-convex surfaces are embedded on the inner hole of each stage of holding ring corresponding to the free ends of the outer edges of the movable blades. The steam stop sheets are uneven and can be matched with different end surfaces arranged at the free ends of the opposite blades at intervals of 0.3-0.5mm, so that the steam is enabled to work only in each stage of moving and static blades to generate enthalpy drop, the problem of steam leakage from the top ends of the blades is eliminated, and high output efficiency is realized. The moving blades and the static blades are all set as reaction blades, the reaction degree is about 50%, and the reaction unit can be designed with more stages under the condition of the same span due to the narrow and small blade structure, so that the enthalpy drop distribution is more uniform, and the unit efficiency is improved.

The matching diameters of the first-stage holding ring 17, the second-stage holding ring 18, the third-stage holding ring 19 and the rotor assembly 20 are increased in sequence, and the matching diameters of the same holding ring and the rotor assembly are gradually increased from a high-pressure end to a low-pressure end. Preferably, the root cross sections of the last-stage moving blade ring and the second-stage moving blade ring of the third-stage holding ring 19 close to one side of the exhaust cylinder 21 are arranged into double-T-shaped ends which are connected in series up and down, and the cross section of a ring groove formed in the rotor assembly 20 is a corresponding double-T-shaped groove; the free end of the two-stage blade ring is an inclined plane, and the inner hole of the opposite holding ring body is also an inclined plane; and the moving blades of the same group of moving blade rings are fixed by inserting through the blade lacing wires 204, so as to further ensure the stability and the balance of the rotor assembly 20 in a high-speed rotation state.

The steam entering the second-stage holding ring b18 and the third-stage holding ring c19 to do work is controlled by the steam extraction regulating valve 15 to regulate the steam inlet quantity. The steam extraction regulating valve 15 is a combined steam valve, three regulating valves which are independently controlled are arranged in a valve body to form a set of combined steam valve, the three regulating valves which are separately controlled are provided with independent valve rods, valve heads and valve seats, the number of the three regulating valves is three, the three valve seats are correspondingly arranged at three inlet positions at the upper end of the steam extraction cylinder 16, and the three valve seats are fixedly connected with the upper cylinder 141 of the high-pressure cylinder 14 through a closing bolt. Through long-term erosion and impact of steam, the problem of blowing loss of the sealing surface of the valve seat occurs, the valve seat can be taken out for replacement or the sealing surface can be ground after the handle bolt connected with the upper cylinder surface of the high-pressure cylinder 14 is detached, the maintenance time is greatly shortened, and the maintenance cost and the maintenance difficulty are reduced.

The steam extracting cylinder 16 is fixedly installed in the high pressure cylinder 14, the steam extracting cylinder 16 is of an upper split half structure and a lower split half structure, steam blocking grooves with uneven heights are formed in inner holes of the steam extracting cylinder, and the steam extracting cylinder and a steam blocking sheet installed on a shaft shoulder arranged at the position of the rotor assembly 20 are overlapped and matched to achieve the steam sealing function, so that steam cannot leak from the shaft shoulder. The steam-blocking sheets arranged on the shaft shoulders are uneven and are matched with the steam-blocking grooves for erection, and the matching distance is preferably set within the range of 0.35-0.5 mm.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be covered by the present invention within the technical scope of the present invention, and the technical solution obtained by replacing or changing the technical idea of the present invention with equivalents.

Claims (10)

1. The utility model provides a biomass power generation high-efficient steam turbine which characterized in that: the device comprises a high-pressure cylinder (14) and a steam exhaust cylinder (21) which are arranged separately and are inserted in front and back in a transverse penetrating way, wherein a rotor assembly (20) transversely penetrates through the high-pressure cylinder (14) and the steam exhaust cylinder (21); the front end of the rotor assembly (20) extends out of the high-pressure cylinder and is provided with a high-pressure bearing box (1), the rear end of the rotor assembly (20) extends out of the exhaust cylinder and is provided with a low-pressure bearing box (24), a high-pressure shaft seal (6) is arranged at the matching position of the rotor assembly (20) and the high-pressure cylinder (14), and a low-pressure shaft seal (22) is arranged at the matching position of the rotor assembly (20) and the exhaust cylinder (21); an axial thrust balancer (8), a steam guide controller (9), a first-stage holding ring (17), an extraction cylinder (16), a second-stage holding ring (18) and a third-stage holding ring (19) are sequentially arranged in the high-pressure cylinder (14) from front to back; the upper cylinder (141) of the high-pressure cylinder is provided with a high-pressure main steam valve (11) for guiding steam to enter the steam turbine, a steam outlet hole of the high-pressure main steam valve (11) is connected with a high-pressure main steam regulating valve (12) which is fixed on the upper cylinder (141) of the high-pressure cylinder and is communicated with a steam inlet of the guide controller (9), and a steam extraction regulating valve (15) is arranged on the steam extraction cylinder (16);

the high-pressure shaft seal (6) comprises an upper shaft seal and a lower shaft seal which are arranged in a split manner, the upper shaft seal and the lower shaft seal are respectively inserted into a convex ring which is preset in an end hole of the high-pressure cylinder (14) through a ring groove structure of an excircle, and the upper shaft seal and the lower shaft seal are fixedly connected through a positioning locking assembly; a plurality of circles of steam-blocking sheets are embedded in an inner hole of the high-pressure shaft seal (6), rotor steam-blocking sheets which are in cross fit with the steam-blocking sheets of the high-pressure shaft seal to form a labyrinth steam seal are correspondingly embedded on the rotor assembly (20), and a steam outlet (61) and a steam inlet (62) with the inlet pressure larger than the front-side atmospheric pressure and the rear-side residual steam pressure are formed in the high-pressure shaft seal (6);

the low-pressure shaft seal (22) is provided with a split arrangement which is the same as that of the high-pressure shaft seal and is arranged in an end hole of the exhaust cylinder (21) in the same structure, a plurality of concave-convex steam seal grooves are formed in an inner hole of the low-pressure shaft seal (22), rotor steam blocking sheets which are inserted and matched with the concave-convex steam seal grooves to form labyrinth steam seals are correspondingly embedded in the rotor assembly (20), and a steam outlet (61) and a steam inlet (62) of which the air inlet pressure is greater than the residual steam pressure at the front side and the atmospheric pressure at the rear side are formed in the body of the low-pressure shaft seal (;

a stator blade ring group (202) consisting of a plurality of stator blade rings is arranged on each of the first-stage retaining ring (17), the second-stage retaining ring (18) and the third-stage retaining ring (19), and a moving blade ring group (201) consisting of a plurality of moving blade rings which are inserted between the stator blade rings in a matched manner is correspondingly arranged on the rotor assembly (20); the static blade ring is composed of a plurality of static blades which are uniformly distributed along the circumferential direction, inserted through inverted T-shaped ends arranged at the root part and tightly pressed in a pre-opened ring groove arranged on each holding ring, the free ends of the outer edges of the static blades are arranged to be concave-convex surfaces relative to the end surface of the rotor assembly, and the outer circle of the rotor assembly (20) is embedded with steam-resistant blades with different heights which point to the concave-convex surfaces in the radial direction corresponding to the free ends of the static blades; the movable blade ring is composed of a plurality of movable blades which are uniformly distributed along the circumferential direction, inserted through T-shaped ends arranged at the root part and tightly pressed in a ring groove pre-arranged on a rotor assembly (20), the free end of the outer edge of each movable blade is arranged to be a concave-convex surface relative to the end surface of each holding ring, and steam-resistant sheets with different heights matched with the concave-convex surface are embedded on the inner hole of each holding ring corresponding to the free end of the outer edge of each movable blade.

2. The turbine according to claim 1, wherein: a high-pressure oil retainer ring (4) is arranged at the matching position of an end hole at the rear end of the high-pressure bearing box (1) and the rotor assembly; the high-pressure oil slinger (4) comprises an upper ring body and a lower ring body which are arranged in a split mode, the upper ring body and the lower ring body are respectively inserted into a ring groove which is pre-formed in an end hole of the high-pressure bearing box (1) through a convex ring structure of an excircle, and the upper ring body and the lower ring body are fixedly connected through a positioning and locking assembly; the inner hole of the high-pressure oil slinger (4) is provided with a plurality of circles of oil slinger teeth (42) which are separated from each other at intervals, and the excircle of the rotor assembly (20) is correspondingly provided with a plurality of circles of blocking ribs (205) which are inserted and matched between the oil slinger teeth; the end face of the blocking rib (205) corresponding to one side inside the high-pressure bearing box is a vertical face for blocking hydraulic oil from flowing, and the end face of the blocking rib (205) corresponding to one side outside the high-pressure bearing box is an inclined face inclined downwards for guiding hydraulic oil for facilitating quick backflow; the upper ring body is provided with a steam inlet hole (41), and the lower ring body is provided with an oil return groove (43) communicated with the inside of the high-pressure bearing box; and low-pressure oil slingers (23, 26) with the same structural function as the high-pressure oil slinger are mounted at end holes at two ends of the low-pressure bearing box (24).

3. The turbine according to claim 2, wherein: the outer end port of the high-pressure oil slinger (4) is fixedly connected with a heat insulation plate (5), and the heat insulation plate (5) comprises at least two layers of aluminum alloy plates which are separated by a set distance through a spacer.

4. The turbine according to claim 1, wherein: the matching diameters of the first-stage holding ring (17), the second-stage holding ring (18), the third-stage holding ring (19) and the rotor assembly (20) are sequentially increased, the matching diameters of the same holding ring and the rotor assembly (20) are gradually increased from the front end to the rear end, the root cross sections of the last-stage moving blade ring and the next-stage moving blade ring on one side, close to the steam exhaust cylinder, of the third-stage holding ring (19) are arranged to be double-T-shaped ends which are connected in series up and down, the cross sections of ring grooves formed in the rotor assembly are corresponding double-T-shaped grooves, and moving blades in the last-stage moving blade ring group and the next-stage moving blade ring group are.

5. The turbine according to claim 1, wherein: the left side and the right side of the bottom surface of the front end of the high-pressure cylinder (14) and the left side and the right side of the bottom surface of the rear end of the exhaust cylinder (21) are both provided with positioning grooves with ejection bolt holes, and a bracket of the steam turbine is provided with corresponding bosses; the rear end of the exhaust cylinder (21) is fixedly connected with the bracket through a fixed port (212), and the front end of the high-pressure cylinder (14) is provided with a floating port (149) flexibly connected with the bracket.

6. The turbine according to claim 1, wherein: a sensor for acquiring the temperature and the pressure of the thrust balancer (8), the first-stage holding ring (17), the second-stage holding ring (18) and the third-stage holding ring (19) is arranged on an upper cylinder of the high-pressure cylinder (14); and a sensor for collecting temperature and pressure is arranged on the rear end surface of the exhaust cylinder (21).

7. The turbine according to claim 1, wherein: a steam inlet (62) and a steam outlet (61) are formed in the lower shaft seal of the high-pressure shaft seal (6), the steam inlet (62) is positioned on the rear side of the steam outlet (61), the steam inlet (62) is communicated with the interior of the high-pressure cylinder (14) through a steam inlet pipe (7), and a second steam outlet (82) is formed below the lower cylinder of the high-pressure cylinder, corresponding to the rear side of the high-pressure shaft seal; the steam inlet of the low-pressure shaft seal (22) is positioned on the front side of the lower half structure, the steam outlet (61) is positioned on the rear side of the upper half structure, and the steam inlet (62) is communicated with the front end of the exhaust cylinder (21) through a third steam inlet pipe (217).

8. The turbine according to claim 1, wherein: the static blades of the static blade ring set (202), the moving blades of the moving blade ring set (201) and the blades in the guide controller (9) are all reaction type blades.

9. The turbine according to claim 1, wherein: and a water inlet nozzle (215) for jetting water into the exhaust cylinder (21) is arranged at the periphery and outer circle of the connecting position of the exhaust cylinder (21) and the high-pressure cylinder (14).

10. The turbine according to claim 1, wherein: the lower cylinder of the high-pressure cylinder (14) is provided with a drain opening corresponding to the axial thrust balancer (8), the second-stage holding ring (18) and the third-stage holding ring (19).

Images