CN110761844A - High-efficiency steam turbine - Google Patents
High-efficiency steam turbine Download PDFInfo
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- CN110761844A CN110761844A CN201911197480.4A CN201911197480A CN110761844A CN 110761844 A CN110761844 A CN 110761844A CN 201911197480 A CN201911197480 A CN 201911197480A CN 110761844 A CN110761844 A CN 110761844A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
- F01D1/04—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines traversed by the working-fluid substantially axially
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/12—Combinations with mechanical gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/162—Bearing supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/166—Sliding contact bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/183—Sealing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/20—Lubricating arrangements using lubrication pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a high-efficiency steam turbine, which comprises a steam exhaust shell and a high-speed shaft assembly, wherein the steam exhaust shell is of an integral structure, a steam exhaust flow passage in the steam exhaust shell adopts a symmetrical equal-circulation flow passage, and the front end of the steam exhaust shell is provided with a steam inlet cover; the vertical gearbox is installed at the rear end of the steam exhaust shell, the vertical gearbox rear cover is installed at the rear end of the vertical gearbox, the high-speed shaft assembly is supported in the vertical gearbox and the vertical gearbox rear cover and comprises a high-speed gear shaft and multistage impellers, the multistage impellers are fixed at the front end of the high-speed gear shaft, a multistage nozzle ring seat is arranged in the steam exhaust shell and between the steam exhaust shell and a steam inlet cover and is provided with multistage nozzle rings, the multistage nozzle rings and the multistage impellers are arranged alternately in the axial direction, the multistage nozzle ring seat, the multistage nozzle rings and the multistage impellers are pushed into the steam exhaust shell from front to back in the axial direction and are fixedly installed with the high-speed gear shaft, a low-speed shaft is arranged below the high-speed gear shaft in parallel, the low-speed shaft is arranged in the vertical gearbox and the vertical gearbox rear cover, and one end of the low-speed shaft.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and relates to a high-efficiency steam turbine.
Background
The working rotating speed of a conventional steam turbine is 1500-10000r/min, the whole structure of a cylinder is a horizontal split structure and a vertical split structure, a bearing is a two-end inner support structure, for a low-power low-pressure steam turbine which operates with fixed working condition parameters, the required working rotating speed is low due to low steam parameters, so that the power transmission is realized by a large-diameter and multi-stage impeller structure generally, the influence of the designed wheel diameter, rotating speed and the like of the steam turbine is influenced, the volume of the steam turbine is large, and the steam turbine is mainly partially fed due to the split structure, so that the steam feeding loss is large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a low-power low-pressure steam turbine which operates according to fixed working condition parameters, is suitable for a high-efficiency steam turbine which operates under the rated working condition with low steam parameters, can reduce steam flow loss, has a small and compact structure, reduces the diameter and the stage number of an impeller compared with the steam turbine with the same parameters, reduces the production cost by adopting an integral steam exhaust shell, and has higher efficiency than that of the conventional steam turbine with the same parameters.
The purpose of the invention is realized as follows:
a high-efficiency steam turbine comprises a steam exhaust shell and a high-speed shaft assembly, wherein the steam exhaust shell is of an integral structure, a steam exhaust flow passage in the steam exhaust shell adopts a symmetrical equal-annular flow passage, the front end of the steam exhaust shell is axially provided with a cavity, the front end of the steam exhaust shell is axially and fixedly provided with a steam inlet cover, and the rear part of the steam inlet cover extends into the cavity of the steam exhaust shell; the rear end of the steam exhaust shell is provided with a vertical gear box, the rear end of the vertical gear box is provided with a vertical gear box rear cover, the high-speed shaft assembly is supported in the vertical gear box and the vertical gear box rear cover and comprises a high-speed gear shaft and a multi-stage impeller, and the multi-stage impeller is fixed at the front end of the high-speed gear shaft through a threaded pull rod and transmits torque through friction; a multi-stage nozzle ring seat is arranged in the steam exhaust shell, between the steam exhaust shell and the steam inlet cover, one side of the multi-stage nozzle ring seat and the inner wall of the steam inlet cover enclose a steam inlet flow passage, and the other side and the inner wall of the steam exhaust shell enclose a steam exhaust flow passage; be equipped with multistage nozzle ring on the multistage nozzle ring seat, multistage nozzle ring and multistage impeller are arranged along axial permutation in turn, multistage nozzle ring seat, multistage nozzle ring and multistage impeller along the axial by preceding in to the back propulsion exhaust casing with high-speed gear axle fixed mounting to it is spacing through exhaust casing axial the below parallel arrangement of high-speed gear axle has the low-speed axle, the low-speed axle is arranged in vertical tooth case and vertical tooth case hou gai, the epaxial low-speed tooth that is equipped with of low-speed, with the high-speed tooth cooperation on the high-speed gear axle, with high-speed axle moment of torsion transmission to low-speed axle, low-speed axle one end is stretched out outside vertical tooth case hou gai for the output moment of torsion.
Furthermore, the multistage nozzle ring seat comprises a first-stage nozzle ring seat and a second-stage nozzle ring seat, a first-stage nozzle ring is arranged on the first-stage nozzle ring seat, a second-stage nozzle ring is arranged on the second-stage nozzle ring seat and is circumferentially positioned and fastened and connected through positioning pins, a first-stage impeller and a second-stage impeller of the multistage impeller are alternately arranged with the first-stage nozzle ring and the second-stage nozzle ring at intervals, and an interstage seal is arranged between the first-stage impeller and the second-stage nozzle ring.
Furthermore, an air inlet flow guide sleeve is further mounted on the first-stage nozzle ring and arranged in the air inlet flow channel and used for guiding the air flow of the air inlet so that the air flow enters from the front end of the air exhaust shell and exhausts from the upper end of the air exhaust shell along the axial direction.
Furthermore, the first-stage nozzle ring, the first-stage impeller, the second-stage nozzle ring and the second-stage impeller form an impeller-stage flow channel, and the impeller-stage flow channel is a full-circumference steam-inlet flow channel. The steam flow can be uniformly distributed along the circumference of the nozzle ring and the turbine to enter the turbine without additional separation loss and secondary flow loss
Furthermore, a first bearing seat and a third bearing are fixed in the vertical gearbox, a second bearing seat and a fourth bearing are fixed in the vertical gearbox rear cover, the high-speed gear shaft is supported by the first bearing in the first bearing seat and the second bearing in the second bearing seat, and the low-speed shaft is supported by the third bearing and the fourth bearing.
Further, cover behind the vertical gear box and still be equipped with the gear pump, the gear pump is located low-speed axle below, and with low-speed shaft gear meshing, by low-speed axle transmission power for reduce the electric consumption of steam turbine.
Further, there is base formula oil station bottom of vertical tooth case still fixed mounting, through the direct oil return in the direct backward flow of lubricating oil in the pipeline with the steam turbine to the oil station cavity, skid-mounted the steam turbine base and the integrated dress that carries on in lubricating oil station, provides lubricating oil for the steam turbine. The occupied space for installing the unit is reduced, and the structure is more compact.
Furthermore, a motor oil pump is further arranged at a position close to the gear pump, and the motor oil pump is connected with the steam turbine through a pipeline and used for lubricating the steam turbine in the initial operation stage of the steam turbine.
Furthermore, a steam seal is arranged between the rear end of the steam exhaust casing and the high-speed gear shaft to form axial seal for the high-speed gear shaft, and an oil seal is arranged between the front end of the vertical gearbox and the high-speed gear shaft to prevent lubricating oil in the vertical gearbox from leaking.
Further, the first bearing and the second bearing both adopt tilting pad sliding bearings.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. because the steam exhaust shell adopts integral casting, does not need a subdivision structure, has large steam inlet quantity, and can greatly reduce the steam exhaust loss because the steam exhaust shell adopts the equal-annular volute for design.
2. The rotor shaft of the steam turbine adopts a high-rotating-speed gear shaft, the diameter and the number of stages of an impeller can be reduced, compared with the diameter of the conventional steam turbine impeller with the same parameters, the diameter of the impeller can be reduced by 35%, the number of stages of the impeller can be reduced by half, and a whole-forged rotor is not required.
3. Because the steam exhaust shell adopts an integral structure, the impeller, the nozzle ring and the nozzle ring seat all adopt an axial installation mode of being pushed into the steam exhaust shell from front to back along the axial direction and being fixedly installed with the high-speed gear shaft, the impeller is in end face compression connection with the high-speed gear shaft through the threaded pull rod, the self-locking nut and the high-speed gear shaft, and the torque transmission is carried out by friction, so that the steam turbine has a small and compact structure, the production cost is reduced, meanwhile, the steam inlet and exhaust loss is small because the diameter of the impeller is small, and the efficiency is obviously higher than that of a conventional steam turbine under the same parameters.
4. The impeller-level flow channel adopts a full-circumference steam inlet type flow channel, so that steam can be uniformly distributed along the nozzle ring and the circumference of the impeller, no additional partial steam inlet loss and eddy loss exist, and the equal-circumference volute adopted by the steam exhaust shell reduces the vortex loss of the traditional exhaust shell.
5. Vertical gear box bottom installation base formula oil station, the direct oil return of cavity, base formula oil station is integrated as a whole with turbine base and lubricating oil station and is carried out the sled dress, has reduced the occupation of land space of unit installation, makes the structure compacter.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the high speed shaft assembly of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1 at I;
FIG. 4 is a schematic view of a skid-mounted structure of the complete turbine equipment;
FIG. 5 is a graph of power-to-pressure ratio for a high speed turbine employing a two-stage impeller according to the present invention at different speeds (high speed);
fig. 6 is a graph showing a power-pressure ratio at different rotational speeds (low rotational speed) of a steam turbine employing four stages of impellers in a conventional steam turbine.
Reference numerals
In the drawing, 1 is a vertical gearbox, 2 is a steam exhaust shell, 3 is a steam inlet cover, 4 is a steam inlet guide cover, 5 is a high-speed shaft component, 6 is a steam seal, 7 is an oil seal, 8 is a first bearing, 9 is a second bearing, 10 is a vertical gearbox rear cover, 11 is a gear pump, 12 is a low-speed shaft, 13 is a third bearing, 14 is a fourth bearing, 15 is a first-stage nozzle ring seat, 16 is a first-stage nozzle ring, 17 is a first-stage impeller, 18 is a second-stage nozzle ring, 19 is a second-stage impeller, 20 is a second-stage nozzle ring seat, 21 is an interstage seal, 22 is a base type oil station, 23 is a motor oil pump, 24 is a generator or dragging equipment, 25 is an oil cooler, 26 is a steam inlet flow channel, 27 is an impeller stage flow channel, and 28 is a steam exhaust flow channel,
51 is a high-speed gear shaft, 52 is a threaded pull rod, and 53 is a lock nut.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The arrow direction in the figure indicates the flow passage direction of the steam flow, and the steam is axially fed and discharged upwards, and the steam inlet direction of the steam turbine is taken as the front end.
Referring to fig. 1-4, a high-efficiency steam turbine comprises a steam exhaust shell 2 and a high-speed shaft assembly 5, wherein the steam exhaust shell 2 is of an integral structure, a symmetrical equal-circulation flow passage is adopted in a steam exhaust flow passage in the steam exhaust shell 2, a cavity is axially arranged at the front end of the steam exhaust shell, a steam inlet cover 3 is axially and fixedly arranged at the front end of the steam exhaust shell 2, and the rear part of the steam inlet cover 3 extends into the cavity of the steam exhaust shell; the rear end of the steam exhaust shell 2 is provided with a vertical gearbox 1, a first bearing seat and a third bearing 13 are fixed in the vertical gearbox 1, the steam exhaust shell 2 is connected with a flange on the end face of the vertical gearbox through a flange, the rear end of the vertical gearbox 1 is provided with a vertical gearbox rear cover 10, a second bearing seat and a fourth bearing 14 are fixed in the vertical gearbox rear cover 10, the high-speed shaft assembly 5 is supported in the vertical gearbox 1 and the vertical gearbox rear cover 10 and comprises a high-speed gear shaft 51 and a multi-stage impeller, the multi-stage impeller is fixed at the front end of the high-speed gear shaft 51 through a threaded pull rod 52 and a locking nut 53, torque is transmitted through friction, and the high-speed gear shaft 51 is supported through a first bearing 8 in the first bearing seat and a second bearing 9 in the second bearing seat; a multi-stage nozzle ring seat is arranged in the steam exhaust shell 2, between the steam exhaust shell 2 and the steam inlet cover 3, one side of the multi-stage nozzle ring seat and the inner wall of the steam inlet cover 3 enclose a steam inlet flow passage 26, and the other side and the inner wall of the steam exhaust shell enclose a steam exhaust flow passage 28; be equipped with multistage nozzle ring on the multistage nozzle ring seat, multistage nozzle ring and multistage impeller arrange along axial alternant, multistage nozzle ring seat, multistage nozzle ring and multistage impeller push by preceding to back along the axial in the steam exhaust shell 2 with high-speed gear shaft 51 fixed mounting to it is spacing through steam exhaust shell 2 axial the below parallel arrangement of high-speed gear shaft 51 has low-speed axle 12, in vertical tooth case 1 and vertical tooth case back lid 10 was arranged in to low-speed axle 12, low-speed axle 12 supported through third bearing 13 and fourth bearing 14, be equipped with the low-speed tooth on the low-speed axle 12, with the cooperation of the high-speed tooth on the high-speed gear shaft 51, transmit the high-speed axle moment of torsion to the low-speed axle, low-speed axle 12 one end stretches out outside vertical tooth case back lid 10 for output moment of torsion is to external generator or other dragging equipment 24.
In the present embodiment, as shown in fig. 3, the multi-stage nozzle ring seat comprises a first-stage nozzle ring seat 15 and a second-stage nozzle ring seat 20, the first-stage nozzle ring 16 is arranged on the first-stage nozzle ring seat 15, the second-stage nozzle ring 18 is arranged on the second-stage nozzle ring seat 20, and is circumferentially positioned and connected with the first-stage nozzle ring 16 and the second-stage nozzle ring 18 through positioning pins and screws to prevent the multi-stage impeller from rotating, the first-stage impeller 17 and the second-stage impeller 19 of the multi-stage impeller are alternately arranged with the first-stage nozzle ring 16 and the second-stage nozzle ring 18, an inter-stage seal 21 is arranged between the,
in order to guide the steam flow of the steam inlet, the steam flow is enabled to enter from the front end of the steam exhaust shell 2 and to exhaust from the upper end of the steam exhaust shell 2 along the axial direction. An air inlet guide sleeve 4 is also arranged on the first-stage nozzle ring 16, and the air inlet guide sleeve 4 is arranged in the air inlet flow passage 26.
For reducing the air intake loss, first order nozzle cascade 16, first order impeller 17, second order nozzle cascade 18 and second order impeller 19 form impeller stage runner 27, impeller stage runner 27 adopts the all-round steam inlet formula runner, and the steam turbine is all the all-round admission from first order nozzle cascade 16, can make the steam flow along nozzle cascade and turbine circumference on the evenly distributed admission, do not have extra partial admission loss and vortex loss, and the steam exhaust shell adopts the equal ring volume spiral case to design, has reduced the vortex loss of traditional exhaust shell.
In this embodiment, still be equipped with gear pump 11 on the lid 10 behind the vertical type gear box, gear pump 11 is located low-speed shaft 12 below, with low-speed shaft gear engagement, through the parallel shaft gear engagement of vertical type gear box 1 during normal operating, by the high-speed gear shaft transmission operating power of steam turbine, adopt the gear pump to reduce the consumption of steam turbine to the electricity as the main oil pump.
In this embodiment, as shown in fig. 4, for direct the steam turbine provides lubricating oil for being convenient for the bottom of vertical tooth case 1 still fixed mounting has base formula oil station 22, through direct oil return in the direct backward flow of lubricating oil in with the steam turbine to the oil station cavity of pipeline, sled dress is integrated into a whole with steam turbine base and lubricating oil station, the occupation of land space of unit installation has been reduced, it is compacter to make the structure, be close to position department of gear pump 11 still is equipped with motor oil pump 23, motor oil pump 23 passes through the pipeline and is connected with the steam turbine, adopt motor oil pump 23 to lubricate earlier when the steam turbine starts, can stop the motor oil pump when waiting for the steam turbine rotational speed to reach operating speed, carry out the fuel feeding lubrication by gear pump 11 of tooth case, the pipeline is connected with the oil cooler under the motor oil pump, input in the motor after cooling the lubricating oil in the base formula oil.
As shown in figure 1, a steam seal 5 is arranged between the rear end of the steam exhaust shell 2 and the high-speed gear shaft 51 to form axial seal for the high-speed gear shaft 51, and an oil seal 7 is arranged between the front end of the vertical gearbox 1 and the high-speed gear shaft 51 to prevent lubricating oil in the vertical gearbox from leaking.
In the present embodiment, the first bearing 8, the second bearing 9, the third bearing 13 and the fourth bearing 14 are all tilting pad sliding bearings.
According to the invention, the impeller and the nozzle ring of the steam turbine are both printed by 3D printing, so that the structure is integrated to increase the strength of the steam turbine, and meanwhile, the impeller is printed by adopting a high-strength material 0Cr17Ni4Cu4Nb, so that the impeller can bear the working stress at a high rotating speed.
Fig. 5 shows a power-pressure ratio curve diagram of the invention adopting a high-speed shaft design, and at a high speed, by arranging two stages of impellers and reducing the diameters of the impellers, the air intake and exhaust losses of a steam turbine can be reduced, and the working efficiency of the steam turbine can be improved, as shown in fig. 6, fig. 6 shows a power-pressure ratio curve diagram of a steam turbine adopting a low-speed shaft and provided with four stages of impellers at a low speed, and at a different speed, as can be seen from two graphs, the power of a high-speed design scheme of full-cycle steam intake is superior to that of a conventional low-speed design scheme of partial steam intake at the same pressure ratio. This is because the conventional low speed design adds a portion of the steam admission loss. Both figures show that the higher the rotating speed, the higher the power under the same design condition; the greater the pressure ratio (the lower the exhaust pressure), the greater the power.
The steam turbine of the invention has small and compact structure, reduces the diameter of the impeller and the stage number of the impeller compared with the steam turbine with the same parameters, reduces the production cost, and has small wheel diameter, high rotating speed, small loss of inlet and outlet steam and higher efficiency than the conventional steam turbine with the same parameters. The turbine has great competitiveness in low-parameter constant working condition dragging or power generation projects.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A high efficiency steam turbine, includes steam extraction shell and high-speed shaft subassembly, its characterized in that: the steam exhaust shell is of an integral structure, the steam exhaust flow passages in the steam exhaust shell adopt symmetrical equal-annular flow passages, the front end of the steam exhaust shell is axially provided with a cavity, the front end of the steam exhaust shell is axially and fixedly provided with a steam inlet cover, and the rear part of the steam inlet cover extends into the cavity of the steam exhaust shell; the rear end of the steam exhaust shell is provided with a vertical gear box, the rear end of the vertical gear box is provided with a vertical gear box rear cover, the high-speed shaft assembly is supported in the vertical gear box and the vertical gear box rear cover and comprises a high-speed gear shaft and a multi-stage impeller, and the multi-stage impeller is fixed at the front end of the high-speed gear shaft through a threaded pull rod and transmits torque through friction; a multi-stage nozzle ring seat is arranged in the steam exhaust shell, between the steam exhaust shell and the steam inlet cover, one side of the multi-stage nozzle ring seat and the inner wall of the steam inlet cover enclose a steam inlet flow passage, and the other side and the inner wall of the steam exhaust shell enclose a steam exhaust flow passage; be equipped with multistage nozzle ring on the multistage nozzle ring seat, multistage nozzle ring and multistage impeller are arranged along axial permutation in turn, multistage nozzle ring seat, multistage nozzle ring and multistage impeller along the axial by preceding in to the back propulsion exhaust casing with high-speed gear axle fixed mounting to it is spacing through exhaust casing axial the below parallel arrangement of high-speed gear axle has the low-speed axle, the low-speed axle is arranged in vertical tooth case and vertical tooth case hou gai, the epaxial low-speed tooth that is equipped with of low-speed, with the high-speed tooth cooperation on the high-speed gear axle, with high-speed axle moment of torsion transmission to low-speed axle, low-speed axle one end is stretched out outside vertical tooth case hou gai for the output moment of torsion.
2. A high efficiency steam turbine according to claim 1 wherein: the multistage nozzle ring seat comprises a first-stage nozzle ring seat and a second-stage nozzle ring seat, a first-stage nozzle ring is arranged on the first-stage nozzle ring seat, a second-stage nozzle ring is arranged on the second-stage nozzle ring seat and is circumferentially positioned and fixedly connected with screws through positioning pins, a first-stage impeller and a second-stage impeller of the multistage impeller are alternately arranged with the first-stage nozzle ring and the second-stage nozzle ring at intervals, and interstage sealing is arranged between the first-stage impeller and the second-stage nozzle ring.
3. A high efficiency steam turbine according to claim 2, wherein: and the first-stage nozzle ring is also provided with a steam inlet flow guide cover which is arranged in the steam inlet flow channel and used for guiding the steam flow of the steam inlet so that the steam flow enters from the front end of the steam exhaust shell and discharges steam from the upper end of the steam exhaust shell along the axial direction.
4. A high efficiency steam turbine according to claim 2, wherein: the first-stage nozzle ring, the first-stage impeller, the second-stage nozzle ring and the second-stage impeller form an impeller-stage flow channel, and the impeller-stage flow channel is a full-circumference steam-inlet flow channel.
5. A high efficiency steam turbine according to claim 1 wherein: the high-speed gear shaft is supported by the first bearing in the first bearing seat and the second bearing in the second bearing seat, and the low-speed shaft is supported by the third bearing and the fourth bearing.
6. A high efficiency steam turbine according to claim 1 wherein: the vertical gearbox rear cover is also provided with a gear pump, the gear pump is positioned below the low-speed shaft and meshed with the low-speed shaft gear, and power is transmitted by the low-speed shaft for reducing the electricity consumption of the steam turbine.
7. A high efficiency steam turbine according to claim 1 wherein: the bottom of vertical tooth case still fixed mounting have a base formula oil station, through the direct oil return in the direct backward flow of lubricating oil in the turbine to the oil station cavity of pipeline, skid-mounted the turbine base and the integrated body in lubricating oil station, provide lubricating oil for the steam turbine.
8. A high efficiency steam turbine according to claim 6 wherein: the position close to the gear pump is also provided with a motor oil pump, and the motor oil pump is connected with the steam turbine through a pipeline and used for lubricating the steam turbine in the initial stage of operation of the steam turbine.
9. A high efficiency steam turbine according to claim 1 wherein: a steam seal is arranged between the rear end of the steam exhaust shell and the high-speed gear shaft to form axial seal for the high-speed gear shaft, and an oil seal is arranged between the front end of the vertical gearbox and the high-speed gear shaft to prevent lubricating oil in the vertical gearbox from leaking.
10. A high efficiency steam turbine according to claim 5, wherein: the first bearing and the second bearing both adopt tilting pad sliding bearings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911197480.4A CN110761844A (en) | 2019-11-29 | 2019-11-29 | High-efficiency steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911197480.4A CN110761844A (en) | 2019-11-29 | 2019-11-29 | High-efficiency steam turbine |
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| CN110761844A true CN110761844A (en) | 2020-02-07 |
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| CN201911197480.4A Pending CN110761844A (en) | 2019-11-29 | 2019-11-29 | High-efficiency steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969806A (en) * | 2021-10-29 | 2022-01-25 | 重庆江增船舶重工有限公司 | High-power multistage axial flow turbine expander |
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2019
- 2019-11-29 CN CN201911197480.4A patent/CN110761844A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969806A (en) * | 2021-10-29 | 2022-01-25 | 重庆江增船舶重工有限公司 | High-power multistage axial flow turbine expander |
| CN113969806B (en) * | 2021-10-29 | 2024-02-02 | 重庆江增船舶重工有限公司 | High-power multistage axial-flow turboexpander |
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