High-rotating-speed ultrahigh-pressure reheating condensing steam turbine

Abstract

The invention relates to a high-rotating-speed ultrahigh-pressure reheating condensing steam turbine which comprises an integral chassis, a cylinder, at least two bearing seats arranged at the front end and the rear end of the cylinder respectively and rotors supported on the two bearing seats, the cylinder extends in the front-back direction and is arranged on the integral chassis, and the high-rotating-speed ultrahigh-pressure reheating condensing steam turbine comprises a high-pressure outer cylinder and a high-pressure inner cylinder arranged in the high-pressure outer cylinder. The low-pressure rear cylinder is installed on the rear side of the high-pressure outer cylinder, the high-pressure outer cylinder is provided with a high-pressure steam exhaust structure allowing high-pressure steam to be exhausted and a reheat steam inlet cavity allowing reheat steam to enter, a high-pressure cavity, a medium-pressure cavity and a steam inlet cavity are defined between the high-pressure outer cylinder and the high-pressure inner cylinder, the high-pressure cavity and the medium-pressure cavity are distributed in a spaced mode, and the steam inlet cavity communicates with the high-pressure cavity. A low-pressure cavity communicated with the medium-pressure cavity and a low-pressure steam exhaust structure for exhausting low-pressure steam are formed in the low-pressure rear cylinder; the rotor is sequentially arranged in the high-pressure cavity, the low-pressure cavity and the steam exhaust cavity in a penetrating mode. The invention aims to solve the problems of low efficiency, large size and complex field installation of the existing low-power high-steam-admission-parameter steam turbine.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a high-speed ultra-high-pressure reheat condensing steam turbine. Background Art

[0002] In recent years, due to the rise in prices of various fuels, in order to improve energy efficiency, users' requirements for the efficiency of steam turbine generator sets have continued to increase.

[0003] The existing design of small-power (generally referring to turbines with a power below 50MW) high steam inlet parameter steam turbines has the problems of low efficiency, large structural size and complex on-site installation. Summary of the invention

[0004] Based on the above description, the present invention provides a high-speed ultra-high-pressure reheat condensing steam turbine to solve the problems of low efficiency, large structural size and complex on-site installation of existing small-power high-inlet steam parameter steam turbines.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A high-speed ultra-high-pressure reheat condensing steam turbine, comprising:

[0007] Overall chassis;

[0008] A cylinder extending in the front-to-rear direction and arranged on the integral chassis, comprising a high-pressure outer cylinder, a high-pressure inner cylinder arranged in the high-pressure outer cylinder, and a low-pressure rear cylinder installed at the rear side of the high-pressure outer cylinder, the high-pressure outer cylinder forming a high-pressure exhaust structure for high-pressure steam to be discharged and a reheat steam inlet chamber for reheat steam to be entered, a high-pressure chamber and a medium-pressure chamber spaced apart and a steam inlet chamber communicating with the high-pressure chamber are defined between the high-pressure outer cylinder and the high-pressure inner cylinder, and the low-pressure rear cylinder forming a low-pressure chamber communicating with the medium-pressure chamber and a low-pressure exhaust structure for low-pressure steam to be discharged;

[0009] At least two bearing seats, the two bearing seats are respectively arranged at the front and rear ends of the cylinder; and,

[0010] A rotor is sequentially arranged in the high-pressure chamber, the medium-pressure chamber and the low-pressure chamber, and two ends of the rotor are respectively supported by two bearings;

[0011] Among them, the steam inlet chamber is connected to the upper side of the high-pressure chamber, the high-pressure exhaust structure is connected to the lower side of the high-pressure chamber, the reheat steam inlet chamber is connected to the side of the high-pressure chamber, and the low-pressure exhaust structure is connected to the lower side of the low-pressure chamber.

[0012] On the basis of the above technical solution, the present invention can also be improved as follows:

[0013] Furthermore, the high-speed ultra-high-pressure reheat condensing steam turbine further comprises:

[0014] A main steam combined steam valve is disposed on the upper side of the high-pressure outer cylinder and communicated with the steam inlet chamber; and

[0015] The reheat steam combined steam valve is arranged on the side of the high-pressure outer cylinder and is communicated with the reheat steam inlet chamber.

[0016] Furthermore, the steam inlet chamber includes at least two steam inlet holes provided in the high-pressure outer cylinder and distributed along the radial direction of the rotor, and a nozzle chamber provided in the high-pressure inner cylinder and connected to the two steam inlet holes;

[0017] The main steam combined steam valve comprises:

[0018] At least two regulating valves, respectively corresponding to the two steam inlets, are welded to the high-pressure outer cylinder; and,

[0019] The main steam valve is welded to one side of one of the regulating valves and is used to communicate with the two regulating valves and the boiler.

[0020] Furthermore, the high-pressure outer cylinder and the high-pressure inner cylinder form an annular cavity with an axis extending in the up-down direction, and the annular cavity surrounds the periphery of the upper end of the nozzle chamber;

[0021] The cylinder further comprises a sealing ring, and the sealing ring is arranged in the annular cavity.

[0022] Furthermore, the high-pressure inner cylinder comprises:

[0023] A cylinder body is sleeved on the periphery of the rotor; and

[0024] An annular spacer is provided in the middle of the cylinder body, and the annular spacer surrounds the periphery of the high-pressure inner cylinder;

[0025] The high-pressure outer cylinder is correspondingly provided with an annular groove adapted to the free end of the annular spacer;

[0026] The high-pressure chamber is located at the front side of the annular spacer, and the medium-pressure chamber is located at the rear side of the annular spacer.

[0027] Furthermore, a full-reaction flow structure is provided between the high-pressure chamber, the medium-pressure chamber and the low-pressure chamber.

[0028] Furthermore, the high-speed ultra-high-pressure reheat condensing steam turbine further comprises at least two oil baffles, the two oil baffles are respectively mounted on the two bearing seats, and each oil baffle is integrated with the corresponding bearing seat; and / or;

[0029] The bearing seat installed at the rear end of the rotor is welded into one body with the low-pressure rear cylinder.

[0030] Furthermore, the high-speed high-pressure reheat-condensing steam turbine also includes a gearbox, which is drivingly connected to the rear end of the rotor.

[0031] Furthermore, the material of the rotor is a high-low pressure composite rotor forging material.

[0032] Furthermore, the cylinder further comprises:

[0033] A high-pressure front steam seal is installed on the high-pressure inner cylinder and is located at the rear side of the steam inlet chamber;

[0034] A high-pressure rear steam seal is installed on the high-pressure outer cylinder and located at the front end of the high-pressure chamber; and

[0035] The low-pressure rear steam seal is installed on the low-pressure rear cylinder and is located at the rear end of the low-pressure chamber.

[0036] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0037] Ultra-high-pressure steam enters the high-pressure chamber from the steam inlet chamber to perform work, and is then discharged to the boiler through the high-pressure exhaust structure. After heating, the reheated steam enters the medium-pressure chamber and the low-pressure chamber through the reheat steam inlet chamber to perform work, and is finally discharged through the low-pressure exhaust structure, thereby improving the efficiency of the steam turbine. In this way, by using the high-pressure chamber and the medium-pressure chamber separated forward and backward, and a whole rotor, the occupied volume is reduced while improving the efficiency of the steam turbine, and the structural size is small. By using the integral chassis, the general assembly and commissioning can be completed in the factory, and the entire chassis can be transported to the project site, reducing the installation period on the project site and facilitating civil engineering design. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic front view of a high-speed ultra-high-pressure reheat condensing steam turbine provided by an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A half-section diagram of

[0040] Figure 3 for Figure 1 Schematic diagram of top view;

[0041] Figure 4 for Figure 1 Schematic side view of .

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] 1. Overall chassis; 2. Cylinder; 21. High-pressure outer cylinder; 211. High-pressure exhaust structure; 212. Annular groove; 22. High-pressure inner cylinder; 221. Cylinder body; 222. Annular spacer; 23. Low-pressure rear cylinder; 231. Low-pressure exhaust structure; 24. High-pressure chamber; 25. Medium-pressure chamber; 26. Steam inlet chamber; 261. Steam inlet hole; 262. Nozzle chamber; 27. Low-pressure chamber; 28. Sealing ring ; 31. Front bearing seat; 311. Thrust support bearing; 32. Rear bearing seat; 321. Rear support bearing; 41. Main steam combined steam valve; 411. Regulating valve; 412. Main steam valve; 42. Reheat steam combined steam valve; 5. Rotor; 6. Gearbox; 71. Front oil stopper; 72. Rear oil stopper; 73. Oil stopper gas pipeline; 81. High-pressure front steam seal; 82. High-pressure rear steam seal; 83. Low-pressure rear steam seal. DETAILED DESCRIPTION

[0044] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0047] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0048] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0049] Reference Figure 1 , Figure 2 and Figure 4 The present invention provides a high-speed ultra-high-pressure reheat condensing steam turbine, comprising:

[0050] Overall chassis 1;

[0051] The cylinder 2 extends in the front-to-rear direction and is arranged on the integral chassis 1, and includes a high-pressure outer cylinder 21, a high-pressure inner cylinder 22 arranged in the high-pressure outer cylinder 21, and a low-pressure rear cylinder 23 installed on the rear side of the high-pressure outer cylinder 21. The high-pressure outer cylinder 21 is formed with a high-pressure exhaust structure 211 for high-pressure steam to be discharged and a reheat steam inlet chamber for reheat steam to enter. The high-pressure outer cylinder 21 and the high-pressure inner cylinder 22 define a high-pressure chamber 24 and a medium-pressure chamber 25 that are spaced apart, and a steam inlet chamber 26 that is connected to the high-pressure chamber 24. The low-pressure rear cylinder 23 is formed with a low-pressure chamber 27 that is connected to the medium-pressure chamber 25 and a low-pressure exhaust structure 231 for low-pressure steam to be discharged.

[0052] At least two bearing seats, the two bearing seats are respectively arranged at the front and rear ends of the cylinder 2; and,

[0053] The rotor 5 is sequentially disposed in the high-pressure chamber 24 , the medium-pressure chamber 25 and the low-pressure chamber 27 , and two ends of the rotor 5 are supported on the two bearing seats respectively.

[0054] Among them, the steam inlet chamber 26 is connected to the upper side of the high-pressure chamber 24, the high-pressure exhaust structure 211 is connected to the lower side of the high-pressure chamber 24, the reheat steam inlet chamber is connected to the side of the high-pressure chamber 24, and the low-pressure exhaust structure 231 is connected to the lower side of the low-pressure chamber 27.

[0055] The ultra-high-pressure steam enters the high-pressure chamber 24 from the steam inlet chamber 26 to perform work, and is then discharged to the boiler through the high-pressure exhaust structure 211. After heating, the reheated steam enters the medium-pressure chamber 25 and the low-pressure chamber 27 through the reheat steam inlet chamber to perform work, and is finally discharged through the low-pressure exhaust structure 231, thereby improving the efficiency of the steam turbine. In this way, by separating the high-pressure chamber 24 and the medium-pressure chamber 25 in the front and rear directions, and a whole rotor 5, the occupied volume is reduced while improving the efficiency of the steam turbine, and the structural size is small. By using the integral chassis 1, the general assembly and commissioning can be completed in the factory, and the entire chassis can be transported to the project site, which reduces the installation period on the project site and facilitates civil engineering design.

[0056] It should be noted that the pressure of ultra-high pressure steam is about 11.8 to 14.7 MPa.

[0057] In this embodiment, the low-pressure rear cylinder 23 is connected to the high-pressure outer cylinder 21 by a vertical flange.

[0058] In this embodiment, the two bearing seats are divided into a front bearing seat 31 and a rear bearing seat 32. The low-pressure rear cylinder 23 and the rear bearing seat 32 are welded into a whole, thereby reducing the axial size of the high-speed ultra-high-pressure reheat condensing steam turbine.

[0059] Reference Figure 2 In this embodiment, the front bearing seat 31 includes a thrust support bearing 311 sleeved on the front end of the rotor 5, and the rear bearing seat includes a rear support bearing 322 sleeved on the rear end of the rotor 5.

[0060] Furthermore, the high-speed ultra-high-pressure reheat condensing steam turbine further comprises at least two oil baffles, the two oil baffles are respectively mounted on the two bearing seats, and each oil baffle is integrated with the corresponding bearing seat. Figure 2 In this embodiment, the two oil baffles are divided into a front oil baffle 71 and a rear oil baffle 72. The front oil baffle 71 is integrated with the front bearing seat 31, and the rear oil baffle 72 is integrated with the rear bearing seat 32. Each of the oil baffles is configured as an airtight oil baffle. Each of the oil baffles forms a clearance fit with the end of the rotor 5; each of the oil baffles is provided with an oil baffle air pipeline 73. By introducing a suitable air source, a certain air supply volume can be maintained between the oil baffle and the rotor 5 to keep the area around the oil baffle clean, so that dust and other impurities mixed with oil are not easily accumulated, so that the rotor 5 has no friction collision with the oil baffle when rotating at high speed, which will not affect the operation safety of the unit and can ensure the operation safety of the high-speed unit.

[0061] In this embodiment, the rotor 5 is configured as a whole forged rotor 5, and the rotor 5 adopts a high-low pressure composite rotor 5 forging material, specifically Cr-Mo-Ni-V steel, which meets the use characteristics of the high-pressure chamber 24 and the medium-pressure chamber 25.

[0062] The high-speed high-pressure reheat condensing steam turbine further includes a gearbox 6, which is in driving connection with the rear end of the rotor 5. In this embodiment, the rear end of the rotor 5 is connected to the gearbox 6 via a high-speed end flexible coupling, and the speed generated by the rotation of the rotor 5 is reduced by the gearbox 6 to rotate the generator rotor 5 of the generator.

[0063] In this embodiment, the high-speed ultra-high-pressure reheat condensing steam turbine also includes a main steam combined steam valve 41 and a reheat steam combined steam valve 42. The main steam combined steam valve 41 is arranged on the upper side of the high-pressure outer cylinder 21 and is connected to the steam inlet chamber 26; the reheat steam combined steam valve 42 is arranged on the side of the high-pressure outer cylinder 21 and is connected to the reheat steam inlet chamber.

[0064] Continue to refer to Figures 2 to 4 In this embodiment, the steam inlet chamber 26 includes at least two steam inlet holes 261 provided in the high-pressure outer cylinder 21 and a nozzle chamber 262 provided in the high-pressure inner cylinder 22, and the two steam inlet holes 261 are spaced apart along the radial direction of the rotor 5; the nozzle chamber 262 is connected to the lower ends of the two steam inlet holes 261. In this embodiment, the main steam combined steam valve 41 is a detachable seated cylinder structure, and the main steam combined steam valve 41 is installed in the middle of the upper end of the high-pressure outer cylinder 21. The main steam combined steam valve 41 includes at least two regulating valves 411 and at least one main steam valve 412. The two regulating valves 411 are welded to the high-pressure outer cylinder 21 corresponding to the two steam inlets 213 respectively; the main steam valve 412 is welded to one side of one regulating valve 411, and one end of the main steam valve 412 is connected to the two regulating valves 411, and the other end is used to connect with the boiler, so that the main steam can enter the high-pressure chamber along the radial direction of the rotor 5, and then axially enter the steam from the front bearing seat 31 to the rear bearing seat 32, thereby improving work efficiency.

[0065] The main steam valve 412 and the two regulating valves 411 are respectively assembled in the main steam valve housing and the regulating valve housing which are cast separately, and the main steam valve housing and the regulating valve housing are then welded together, which is simple in layout and occupies less space as a whole. Each regulating valve 411 is assembled in the regulating valve housing, and the regulating valve housing is welded to the cylinder 2, which simplifies the structure of the cylinder 2. The main steam valve 412 can be flexibly selected to be welded on different sides of the regulating valve housing, eliminating the main steam pipeline between the main steam valve 412 and the boiler and the steam guide pipe between the regulating valve 411 and the cylinder 2, with a compact structure and small space occupation.

[0066] In addition, since the main steam valve 412 and each of the regulating valves 411 are cast and welded separately to form the main steam combined steam valve 41, different numbers of the main steam valves 412 and the regulating valves 411 can be selected for splicing and combination according to different steam inlet conditions, or two main steam valves 412 can be matched with three regulating valves 411. The connection method is not limited here, and it is specifically set according to actual installation requirements, as long as each of the regulating valves 411 is connected to the cylinder 2, and each of the main steam valves 412 is connected to the regulating valve 411 and the boiler. If the lower side of the high-pressure outer cylinder 21 is also arranged with a steam inlet chamber 26, it is connected to the 411 regulating valve through a connecting pipe.

[0067] Specifically, refer to Figure 2 In this embodiment, the high-pressure outer cylinder 21 and the high-pressure inner cylinder 22 form an annular cavity with an axis extending in the vertical direction, and the annular cavity surrounds the periphery of the upper end of the nozzle chamber 262. The cylinder 2 also includes a sealing ring 28, and the sealing ring 28 is arranged in the annular cavity. In this embodiment, the sealing ring 28 is used to ensure the sealing performance between the steam inlet hole 261 and the nozzle chamber 262.

[0068] In this embodiment, the cylinder 2 further includes a high-pressure front steam seal 81, a high-pressure rear steam seal 82 and a low-pressure rear steam seal 83. The high-pressure front steam seal 81 is installed on the high-pressure inner cylinder 22 and is located at the rear side of the steam inlet chamber 26, and is used to separate the medium-pressure chamber 25. The high-pressure rear steam seal 82 is installed on the high-pressure outer cylinder 22 and is located at the front end of the high-pressure chamber 24. The low-pressure rear steam seal 83 is installed on the low-pressure rear cylinder 23 and is located at the rear end of the low-pressure chamber 27. In this way, the steam tightness of the high-pressure chamber 24 is ensured.

[0069] Reference Figure 2 In order to isolate the high-pressure chamber 24 and the medium-pressure chamber 25, the high-pressure inner cylinder 22 includes a cylinder body 221 and an annular spacer 222, and the cylinder body 221 is sleeved on the periphery of the rotor 5; the annular spacer 222 is arranged in the middle of the cylinder body 221, and the annular spacer 222 surrounds the periphery of the high-pressure inner cylinder 22; the cavity wall of the inner cavity of the high-pressure outer cylinder 21 is correspondingly recessed with an annular groove 212 adapted to the free end of the annular spacer 222; the high-pressure chamber 24 is located on the front side of the annular spacer 222, and the medium-pressure chamber 25 is located on the rear side of the annular spacer 222.

[0070] In this embodiment, the annular spacer 222 is integrally cast with the cylinder body 221, and the free end of the annular spacer 222 is adapted to the annular groove 212, thereby separating the high-pressure chamber 24 and the medium-pressure chamber 25 between the high-pressure inner cylinder 22 and the high-pressure outer cylinder 21. In this way, the structure is simple and the manufacturing is convenient.

[0071] In this embodiment, a full reaction flow structure is formed between the high pressure chamber 24, the medium pressure chamber 25 and the low pressure chamber 27. The full reaction flow structure includes a flow part composed of a nozzle, a stationary blade grid and a moving blade grid. The reaction blade has a large diameter of a small circle on the steam inlet side, a wide range of attack angle adaptation, and high efficiency at partial load; the reaction flow stage spacing is small, multiple stages can be arranged, the reheat coefficient is large, and there is no balance hole steam leakage, and the leakage loss is small; the axial clearance from the steam outlet side of the stationary blade to the steam inlet side of the moving blade of the reaction stage is larger than that of the impulse stage, which can reduce the exciting force on the moving blade, and at the same time, it can allow a large relative expansion between the rotor 5 and the stator, which is beneficial to improving the load adaptability of the unit; the reaction holding ring and the stationary blade can adopt an assembly scheme, the stationary blade channel has no deformation caused by welding and heat treatment, the flow accuracy is good, and the efficiency is high.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed ultra-high-pressure reheat condensing steam turbine, characterized in that: include: Overall chassis; A cylinder extending in the front-to-rear direction and arranged on the integral chassis, comprising a high-pressure outer cylinder, a high-pressure inner cylinder arranged in the high-pressure outer cylinder, and a low-pressure rear cylinder installed at the rear side of the high-pressure outer cylinder, the high-pressure outer cylinder forming a high-pressure exhaust structure for high-pressure steam to be discharged and a reheat steam inlet chamber for reheat steam to be entered, a high-pressure chamber and a medium-pressure chamber spaced apart and a steam inlet chamber communicating with the high-pressure chamber are defined between the high-pressure outer cylinder and the high-pressure inner cylinder, and the low-pressure rear cylinder forming a low-pressure chamber communicating with the medium-pressure chamber and a low-pressure exhaust structure for low-pressure steam to be discharged; At least two bearing seats, the two bearing seats are respectively arranged at the front and rear ends of the cylinder; and, A rotor is sequentially arranged in the high-pressure chamber, the medium-pressure chamber and the low-pressure chamber, and two ends of the rotor are respectively supported by two bearings; Among them, the steam inlet chamber is connected to the upper side of the high-pressure chamber, the high-pressure exhaust structure is connected to the lower side of the high-pressure chamber, the reheat steam inlet chamber is connected to the side of the high-pressure chamber, and the low-pressure exhaust structure is connected to the lower side of the low-pressure chamber.

2. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The high-speed ultra-high-pressure reheat condensing steam turbine further comprises: A main steam combined steam valve is disposed on the upper side of the high-pressure outer cylinder and communicated with the steam inlet chamber; and The reheat steam combined steam valve is arranged on the side of the high-pressure outer cylinder and is communicated with the reheat steam inlet chamber.

3. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 2, characterized in that: The steam inlet chamber includes at least two steam inlet holes provided in the high-pressure outer cylinder and distributed along the radial direction of the rotor, and a nozzle chamber provided in the high-pressure inner cylinder and connected to the two steam inlet holes; The main steam combined steam valve comprises: At least two regulating valves, respectively corresponding to the two steam inlets, are welded to the high-pressure outer cylinder; as well as, The main steam valve is welded to one side of one of the regulating valves and is used to communicate with the two regulating valves and the boiler.

4. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 3, characterized in that: The high-pressure outer cylinder and the high-pressure inner cylinder form an annular cavity with an axis extending in the up-down direction, and the annular cavity surrounds the periphery of the upper end of the nozzle chamber; The cylinder further comprises a sealing ring, and the sealing ring is arranged in the annular cavity.

5. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The high pressure inner cylinder comprises: A cylinder body is sleeved on the periphery of the rotor; and An annular spacer is provided in the middle of the cylinder body, and the annular spacer surrounds the periphery of the high-pressure inner cylinder; The high-pressure outer cylinder is correspondingly provided with an annular groove adapted to the free end of the annular spacer; The high-pressure chamber is located at the front side of the annular spacer, and the medium-pressure chamber is located at the rear side of the annular spacer.

6. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: A full-reaction flow structure is provided between the high-pressure chamber, the medium-pressure chamber and the low-pressure chamber.

7. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The high-speed ultra-high-pressure reheat condensing steam turbine further comprises at least two oil baffles, the two oil baffles are respectively mounted on the two bearing seats, and each oil baffle is integrated with the corresponding bearing seat; and / or; The bearing seat installed at the rear end of the rotor is welded into one body with the low-pressure rear cylinder.

8. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The high-speed high-pressure reheat condensing steam turbine further comprises a gear box, which is drivingly connected to the rear end of the rotor.

9. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The material of the rotor is a high-low pressure composite rotor forging material.

10. The high-speed ultra-high-pressure reheat condensing steam turbine according to claim 1, characterized in that: The cylinder also includes: A high-pressure front steam seal is installed on the high-pressure inner cylinder and is located at the rear side of the steam inlet chamber; A high-pressure rear steam seal is installed on the high-pressure outer cylinder and located at the front end of the high-pressure chamber; and The low-pressure rear steam seal is installed on the low-pressure rear cylinder and is located at the rear end of the low-pressure chamber.

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