Mixed-flow type saturated steam power generation turbine
By combining runoff and axial flow turbines with a mixed-flow structure, the problems of large flow losses and increased unit size in existing technologies have been solved, achieving high-efficiency power generation and cost savings.
Patent Information
- Application Number
- CN202520264658.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-19
AI Technical Summary
Existing saturated steam turbines suffer from significant flow losses and reduced power generation efficiency due to drastic changes in the direction of the interstage guide flow channels. Furthermore, the multi-cylinder arrangement increases the unit's size and cost.
It adopts a mixed-flow structure, combining radial and axial flow turbines, and is equipped with a first-stage radial flow stationary blade, a radial flow impeller, a second-stage axial flow stationary blade, and an axial flow impeller. Combined with cylinder dry sealing rings, steam seal teeth, and stepped structures, it reduces steam leakage and improves the work capacity of a single cylinder.
It improves power generation efficiency, reduces unit size, saves costs, reduces steam leakage loss, and improves the work capacity of a single cylinder.
Smart Images
Figure CN223894205U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to steam power generation steam turbine technical field especially relates to a mixed flow type saturated steam power generation steam turbine. BACKGROUND
[0002] The existing saturated steam turbine adopts pure radial flow or pure axial flow turbine. When pure radial flow turbine is adopted, when two-stage radial flow turbine is arranged in the same cylinder, the direction of the guide section channel between stages changes sharply, which causes large flow loss and reduces power generation efficiency, so only one-stage radial flow turbine is arranged in a single cylinder, so the power generation capacity of the single cylinder is limited.
[0003] When the power generation capacity of a single cylinder cannot meet the demand, cylinders are arranged at both ends of the high-speed shaft of the gear box, and sometimes multiple high-speed shafts and multiple cylinders are arranged, which increases the volume of the entire unit and increases the cost.
[0004] When the number of cylinders increases, the number of steam conveying pipes also increases, which increases the steam pressure loss and reduces the power generation efficiency. UTILITY MODEL CONTENTS
[0005] The utility model aims at solving the shortcomings in the prior art and provides a mixed flow type saturated steam power generation steam turbine, which comprises:
[0006] A cylinder, which comprises a vertical inlet cavity and a horizontal outlet cavity, and a reinforcing rib is arranged on the inner wall of the cylinder at a position corresponding to the connection between the two cavities, and a convex structure at the bottom of the outer wall of the cylinder away from the horizontal outlet cavity is fixedly connected with the gear box;
[0007] A stationary vane assembly, which comprises first-stage radial flow stationary vanes fixedly arranged on the inner wall of the vertical inlet cavity and second-stage axial flow stationary vanes fixedly arranged on the reinforcing rib;
[0008] A rotor assembly, which comprises a rotating member connected with the high-speed shaft of the gear box and first-stage radial flow moving vane impellers and second-stage axial flow moving vane impellers sleeved on the periphery of the rotating member.
[0009] Further, the first-stage radial flow stationary vanes are connected with the cylinder through bolt fastening, and the second-stage axial flow stationary vanes are connected with the reinforcing rib through bolt fastening.
[0010] Further, the rotating member is a pull rod stud, the connecting end of the pull rod stud is arranged in the mounting hole of the high-speed shaft of the gear box and is fastened and connected through a nut.
[0011] Further, a cylinder dry seal ring is arranged between the lower end face of the convex structure and the high-speed shaft of the gear box.
[0012] Further, the second stage axial flow static blade is provided with a recessed step structure at a position corresponding to the second stage axial flow blade wheel.
[0013] Further, the tip of the second stage axial flow static blade is provided with a second stage static blade steam seal.
[0014] Further, the side of the first stage radial flow blade wheel is provided with a steam seal tooth; the tip shroud of the second stage axial flow blade wheel is provided with a steam seal tooth.
[0015] Compared with the prior art, the utility model has the beneficial effects that:
[0016] 1. The utility model relates to a mixed flow type saturated steam power generation steam turbine which is provided with a first stage radial flow static blade, a first stage radial flow blade wheel, a second stage axial flow static blade and a second stage axial flow blade wheel, and combines the radial flow turbine and the axial flow turbine to form a mixed flow type turbine, thereby improving the single cylinder work capacity, improving the power generation efficiency, saving the cost, and reducing the unit volume.
[0017] 2. The utility model relates to a mixed flow type saturated steam power generation steam turbine which is provided with a steam cylinder dry seal ring between the lower end surface of the protruding structure and the high speed shaft of the gear box, effectively reduces the end leakage steam through the gas seal, prevents the external air from entering the steam cylinder, and is provided with a steam seal tooth on the side of the first stage radial flow blade wheel, a steam seal tooth on the tip shroud of the second stage axial flow blade wheel, and a step structure on the second stage axial flow static blade, thereby reducing the steam leakage through the above-mentioned multiple measures and improving the efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings provide a further understanding of the present application and constitute a part thereof, illustrate embodiments of the present application and together with the description serve to explain the present application, and do not limit the present application. In the drawings:
[0019] Figure 1 Fig. 1 is a structural schematic view of the utility model of a mixed flow type saturated steam power generation steam turbine.
[0020] REFERENCE NUMERALS
[0021] 1: steam cylinder;
[0022] 11: vertical inlet cavity; 12: horizontal outlet cavity; 13: reinforcing rib; 14: protruding structure;
[0023] 2: static blade assembly;
[0024] 21: first stage radial flow static blade; 22: second stage axial flow static blade; 23: second stage static blade steam seal;
[0025] 3: rotor assembly;
[0026] 31: Rotating component; 32: First-stage radial flow impeller; 33: Second-stage axial flow impeller;
[0027] 4: High-speed shaft;
[0028] 5: Cylinder dry seal ring. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.
[0030] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".
[0031] First Embodiment
[0032] Please see Figure 1 The technical solution for a mixed-flow saturated steam power generation turbine provided in this embodiment includes the following:
[0033] Cylinder 1, the cylinder 1 includes a through vertical inlet cavity 11 and a horizontal outlet cavity 12, the inner wall of the cylinder 1 is provided with a reinforcing rib 13 at the corresponding position of the connection between the two cavities, and the protruding structure 14 at the bottom of the outer wall of the cylinder 1 away from the horizontal outlet cavity 12 is fixedly connected to the gearbox.
[0034] The stationary blade assembly 2 includes a first-stage radial stationary blade 21 fixedly disposed on the inner wall of the vertical inlet cavity 11 and a second-stage axial stationary blade 22 fixedly disposed on the reinforcing rib 13;
[0035] The rotor assembly 3 includes a rotating component 31 connected to the high-speed shaft 4 of the gearbox, and a first-stage radial flow impeller 32 and a second-stage axial flow impeller 33 sleeved around the rotating component 31.
[0036] In specific implementation, as shown in the appendix Figure 1As shown in the figure, the inner cavity of the cylinder 1, which is arranged in a mirror L-shape, includes a vertical inlet cavity 11 and a horizontal outlet cavity 12. The steam inlet at the top of the cylinder 1 is a flange structure, which is connected to an external pipeline for transporting saturated steam. A reinforcing rib 13 (also called a "belt") is provided around the rightmost side of the inner wall of the cylinder 1 that connects to the horizontal outlet cavity 12, facing the axis of the horizontal outlet cavity 12. The reinforcing rib 13 structure has the functions of enhancing the strength of the cylinder 1, optimizing fluid flow, and supporting the baffle and the stationary vane. The second-stage axial flow stationary vane 22 of this utility model is fastened to the reinforcing rib 13 by bolts.
[0037] Preferably, the first-stage runoff stationary vane 21 is fastened to the cylinder 1 by bolts, wherein the bolts can be tightened outside the cylinder 1 to ensure a seal.
[0038] In practical implementation, the raised structure 14 on the side of cylinder 1 is typically used to install connecting flanges or other connecting components. Taking flange connection as an example, the flange is designed with multiple bolt holes, and high-strength bolts are used to tightly connect cylinder 1 and gearbox together. This connection method can withstand large torque and axial force, ensuring stability during operation. Therefore, cylinder 1 does not require separate support. Other reasonable connection methods between cylinder 1 and gearbox can also be used in this application.
[0039] Specifically, the rotating component 31 is a tie rod stud, and the connecting end of the tie rod stud is configured in the mounting hole of the high-speed shaft 4 of the gearbox and fastened by a nut so that the rotor assembly 3 as a whole forms a cantilever structure. The cantilever structure is common knowledge in the technical field of this application, so it will not be described in detail.
[0040] In specific implementation, this utility model has multiple measures to reduce steam leakage, including: 1) A cylinder dry sealing ring 5 is provided between the lower end face of the protruding structure 14 and the high-speed shaft 4 of the gearbox, which effectively reduces end steam leakage and prevents external air from entering the cylinder 1 through gas sealing; 2) The second-stage axial flow stationary vane 22 is provided with a recessed stepped structure at the position corresponding to the second-stage axial flow impeller 33, the side of the first-stage axial flow impeller 32 is provided with steam sealing teeth, and the blade tip circumference of the second-stage axial flow impeller 33 is provided with steam sealing teeth, all of which can effectively reduce steam leakage; 3) In addition, the blade tip of the second-stage axial flow stationary vane 22 is provided with a second-stage stationary vane steam seal 23, and the steam sealing teeth machined at the bottom of the second-stage stationary vane steam seal 23 can also effectively reduce steam leakage between the first and second stages of flow.
[0041] The working principle or process of the mixed-flow saturated steam power generation turbine provided by this utility model is as follows: saturated steam flows radially into the cylinder 1 inlet, and expands and does work by passing through the first-stage radial flow stationary blade 21, the first-stage radial flow impeller 32, the second-stage axial flow stationary blade 22, and the second-stage axial flow impeller 33 in sequence. After the work is completed, it flows out of the cylinder 1 axially from the left side.
[0042] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A mixed-flow saturated steam power generation turbine, characterized in that, include: The cylinder includes a through vertical inlet chamber and a horizontal outlet chamber. A reinforcing rib is provided on the inner wall of the cylinder at a position corresponding to the connection between the two chambers. A protruding structure on the bottom of the outer wall of the cylinder away from the horizontal outlet chamber is fixedly connected to the gearbox. The stationary vane assembly includes a first-stage radial stationary vane fixedly disposed on the inner wall of the vertical inlet cavity and a second-stage axial stationary vane fixedly disposed on the reinforcing rib; The rotor assembly includes a rotating component connected to the high-speed shaft of the gearbox and a first-stage radial flow impeller and a second-stage axial flow impeller sleeved around the rotating component.
2. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: The first-stage radial flow vane is fastened to the cylinder by bolts; the second-stage axial flow vane is fastened to the reinforcing rib by bolts.
3. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: The rotating component is a tie rod stud, and the connecting end of the tie rod stud is configured in the mounting hole of the high-speed shaft of the gearbox and fastened with a nut.
4. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: A cylinder dry sealing ring is provided between the lower end face of the protruding structure and the high-speed shaft of the gearbox.
5. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: The second-stage axial flow stationary blade has a recessed stepped structure at a position corresponding to the second-stage axial flow impeller.
6. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: The tip of the second-stage axial flow stationary blade is equipped with a second-stage stationary blade steam seal.
7. The mixed-flow saturated steam power generation turbine according to claim 1, characterized in that: The first-stage radial flow impeller has steam seal teeth on its side; the second-stage axial flow impeller has steam seal teeth on its tip circumference.