Cylinder structure of throttling extraction steam turbine
The integrated cylinder structure design solves the problems of machining accuracy and installation complexity of throttling extraction steam turbines, achieving higher precision and smaller size, simplifying the installation process and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA CHANGJIANG POWER GROUP CO LTD
- Filing Date
- 2023-09-17
- Publication Date
- 2026-05-29
AI Technical Summary
Existing throttling extraction steam turbines have high requirements for cylinder structure machining accuracy, complex installation process, and large radial dimensions.
Design an integrally molded cylinder structure that integrates the intermediate steam chamber, steam seal mounting groove, regulating valve cover mounting seat, and regulating valve mounting seat with the lower or upper half of the cylinder, simplifying the machining and assembly process.
It reduces the requirements for machining and assembly processes, improves precision, reduces the size and material usage of cylinders, simplifies the installation process, and improves production efficiency.
Smart Images
Figure CN117211908B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of steam turbine technology, and more particularly to a cylinder structure for a throttling extraction steam turbine. Background Technology
[0002] A steam turbine is a rotating machine that uses steam as power and converts the thermal energy of steam into mechanical work. A steam turbine consists of two parts: a rotating part and a stationary part. The rotor includes the main shaft, impeller, moving blades, and coupling, while the stator includes the steam inlet section, cylinder, diaphragms, stationary blades, steam seals, and bearings. Steam turbines have advantages such as high single-unit power, high efficiency, and long service life. Based on thermodynamic characteristics, they can be classified into condensing, heating, back-pressure, extraction, and saturated steam turbines; among them, extraction steam turbines can extract steam from intermediate stages for heating. Currently, the throttling extraction steam turbine is the most commonly used type on the market.
[0003] In a typical throttling extraction steam turbine, the cylinder and intermediate steam chamber are both separate structures. The cylinder has an intermediate steam chamber mounting slot, while the intermediate steam chamber has a steam seal mounting slot and a retaining ring slot (or diaphragm sleeve mounting slot). The intermediate steam chamber is centered, positioned, and fixed on the intermediate steam chamber mounting slot by suspension on both sides of the horizontal split surface and a key at the bottom of the mounting slot. Because the intermediate steam chamber and the intermediate steam chamber mounting slot are machined separately, and the intermediate steam chamber is then installed onto the cylinder's intermediate steam chamber mounting slot after machining, the machining accuracy requirements for the cylinder and intermediate steam chamber are relatively high. At the same time, because the cylinder and intermediate steam chamber are both separate designs, the intermediate steam chamber requires separate structures for engagement, positioning, suspension, and bottom adjustment keys, making its installation process relatively complex. In addition, because the cylinder needs to accommodate the above structures, the radial dimension of the cylinder is also relatively large.
[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention
[0005] This invention provides a comprehensive solution to one or more technical problems existing in the cylinder structure of existing throttling extraction steam turbines, such as high machining accuracy requirements, complex installation process, and large radial dimensions.
[0006] This invention provides a cylinder structure for a throttling extraction steam turbine, comprising:
[0007] 1. Lower cylinder half; 2. Upper cylinder half; 3. Steam seal mounting groove; 4. Steam chamber; 5. Regulating valve cover mounting seat; 6. Regulating valve mounting seat; 7. Guide rib; 8. Holding ring mounting groove; 9. Drain hole; 10. Throttling steam extraction port; and 11. Regulating valve.
[0008] After assembly, the lower cylinder half 1 and the upper cylinder half 2 together with the steam seal mounting groove 3, the regulating valve cover mounting seat 5, and the regulating valve mounting seat 6 form the steam chamber 4. The steam seal mounting groove 3, the regulating valve cover mounting seat 5, the regulating valve mounting seat 6, and the retaining ring mounting groove 8 are integrally formed. The guide rib 7 is located on one side of the steam chamber 4, with one end connected to the regulating valve cover mounting seat 5 and the other end connected to the regulating valve mounting seat 6. The regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are used to connect the regulating valve 11. The drain hole 9 is connected to the bottom of the chamber wall of the steam seal mounting groove 3 and the retaining ring mounting groove 8. The throttling steam extraction port 10 is connected to the steam chamber 4.
[0009] Preferably, the regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are integrally formed with the lower half of the cylinder 1 and have a smooth transition.
[0010] Preferably, the regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are integrally formed with the upper cylinder 2 and have a smooth transition.
[0011] Preferably, the regulating valve 11 is screwed to the regulating valve cover mounting seat 5.
[0012] Preferably, the throttling extraction port 10 is located in the lower half 1 or the upper half 2 of the cylinder.
[0013] Preferably, the number of throttling extraction ports 10 is one or more.
[0014] Preferably, the number of regulating valves 11 is one or more.
[0015] Preferably, each chamber is provided with a regulating valve 11, or multiple regulating valves 11 share a chamber.
[0016] Preferably, the drainage hole 9 is located on the chamber wall of the lower half of the cylinder 1 or the regulating valve cover mounting seat 5.
[0017] Preferably, the number of hydrophobic holes 9 is one or more.
[0018] In view of the shortcomings of the prior art, the beneficial effects that the present invention can achieve are as follows:
[0019] This invention designs the intermediate steam chamber (including the steam seal mounting groove, the regulating valve cover mounting seat, the regulating valve mounting seat, and the retaining ring mounting groove) as an integrally formed structure, which can eliminate this part of the processing and assembly structure, thereby reducing the processing and assembly process requirements and precision requirements.
[0020] Furthermore, this invention designs the intermediate steam chamber (including the steam seal mounting groove, regulating valve cover mounting seat, regulating valve mounting seat, and retaining ring mounting groove) and the cylinder (including the lower and upper cylinder halves) as an integrally formed structure. During the precision machining of the cylinder (including the lower and upper cylinder halves), the steam seal mounting groove, regulating valve cover mounting seat, regulating valve mounting seat, and retaining ring mounting groove can be machined simultaneously, achieving higher machining accuracy than when the intermediate steam chamber and cylinder are designed and machined separately. Simultaneously, because the intermediate steam chamber and cylinder are an integral structure, the cylinder does not require a large chamber to accommodate the intermediate steam chamber structure. The cylinder size can be smaller than in a separate design, resulting in a more compact cylinder structure, reduced cylinder size, and material savings. Furthermore, in a separate design, the intermediate steam chamber and cylinder require the machining of mounting slots and bottom keys for the intermediate steam chamber on the cylinder. The split sections also require the design of engagement bolts and positioning structures. After machining these components separately, centering and leveling are necessary during assembly. When integrated with the cylinder, the engagement structure can be replaced by the split engagement and positioning structures within the cylinder, further reducing machining and assembly steps, saving machining and assembly time, and improving production efficiency.
[0021] In addition, apart from the lower and upper cylinder components, the installation positions of other components can be flexibly set and the number of applications can be matched as needed, which can meet the diverse needs of the current scenario.
[0022] Overall, compared with the cylinder structure of existing throttling extraction steam turbines, this invention has many advantages such as simple processing technology, convenient installation process, small size, flexible application and wide applicability. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0024] Figure 1 This is a cross-sectional view of the cylinder structure of a throttling extraction steam turbine provided in Embodiment 1;
[0025] Figure 2 This is a top half sectional view of the cylinder structure of a throttling extraction steam turbine provided in Embodiment 1;
[0026] Figure 3 This is a partial assembly drawing of the cylinder structure of a throttling extraction steam turbine provided in Example 1.
[0027] In the accompanying drawings, the same reference numerals are used to denote the same parts or structures, wherein:
[0028] 1-Lower half of cylinder; 2-Upper half of cylinder; 3-Steam seal mounting groove; 4-Steam chamber; 5-Regulating valve cover mounting seat; 6-Regulating valve mounting seat; 7-Guide rib; 8-Holding ring mounting groove; 9-Drain hole; 10-Throttle steam extraction port; 11-Regulating valve. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0030] In the description of this invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0031] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0032] To address one or more technical problems existing in the cylinder structure of current throttling extraction steam turbines, such as high machining precision requirements, complex installation processes, and large radial dimensions, this embodiment 1 provides a cylinder structure for a throttling extraction steam turbine, as follows: Figures 1-3 As shown, it includes: a lower cylinder half 1, an upper cylinder half 2, a steam seal mounting groove 3, a steam chamber 4, a regulating valve cover mounting seat 5, a regulating valve mounting seat 6, a guide rib 7, a retaining ring mounting groove 8, a drain hole 9, a throttling steam extraction port 10, and a regulating valve 11; after assembly, the lower cylinder half 1 and the upper cylinder half 2, together with the steam seal mounting groove 3, the regulating valve cover mounting seat 5, and the regulating valve mounting seat 6, constitute the steam chamber 4; the steam seal mounting groove 3, the regulating valve cover mounting seat 5, the regulating valve mounting seat 6, and the retaining ring mounting groove 8 are integrally formed, combining to form an integrated intermediate steam chamber; the guide rib 7 is located on the steam... On one side of chamber 4, one end is connected to regulating valve cover mounting seat 5, and the other end is connected to regulating valve mounting seat 6. The guide rib 7 serves to guide steam and also strengthens the structural strength of the intermediate steam chamber. Regulating valve cover mounting seat 5 and regulating valve mounting seat 6 are used to connect regulating valve 11. In practice, regulating valve 11 is screwed to regulating valve cover mounting seat 5. Drain hole 9 is connected to the bottom of the chamber wall of steam seal mounting groove 3 and retaining ring mounting groove 8. Drain hole 9 is used to discharge the steam after condensation into water. Throttling steam extraction port 10 is connected to steam chamber 4.
[0033] In this embodiment, by designing the intermediate steam chamber (including the steam seal mounting groove, the regulating valve cover mounting seat, the regulating valve mounting seat, and the retaining ring mounting groove) as an integrally formed structure, this part of the processing and assembly structure can be eliminated, thereby reducing the processing and assembly process requirements and precision requirements.
[0034] To further reduce processing and assembly steps, thereby saving processing and assembly time, improving production efficiency, and reducing the size of the cylinder, optionally, the regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are integrally formed with the lower cylinder half 1 and smoothly transitioned, or the regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are integrally formed with the upper cylinder half 2 and smoothly transitioned. That is, the intermediate steam chamber can be designed as an integrally formed structure with the lower cylinder half 1 or the upper cylinder half 2. During the assembly process, only the lower cylinder half 1 and the upper cylinder half 2 need to be assembled to complete the overall assembly process.
[0035] As other alternative implementations, in practical applications, the throttling extraction port 10 can be flexibly located in the lower half 1 or the upper half 2 of the cylinder, as long as the throttling extraction port 10 is kept connected to the steam chamber 4. Depending on the required extraction volume, the number of throttling extraction ports 10 can be one or more. Similarly, the number of regulating valves 11 can also be one or more. Depending on the application requirements, each chamber can be equipped with one regulating valve 11, or multiple regulating valves 11 can share one chamber. The drain hole 9 is located on the chamber wall of the lower half 1 of the cylinder or the regulating valve cover mounting seat 5 (when the regulating valve cover mounting seat 5 and the regulating valve mounting seat 6 are located in the lower half 1 of the cylinder). Similarly, depending on the required drainage volume, the number of drain holes 9 can be one or more.
[0036] This embodiment provides a cylinder structure for a throttling extraction steam turbine, wherein the steam flow process is as follows:
[0037] like Figure 1 As shown, during steam extraction from the turbine, a portion of the steam is extracted from the cylinder through the throttling extraction port 10 designed at the bottom of the cylinder on the left side of the steam seal mounting groove 3, providing heat or steam to the outside. The other portion of the steam enters the steam chamber 4 through the steam flow port at the top of the cylinder on the left side of the steam seal mounting groove 3. After flowing through the filter element of the regulating valve 11 and the guiding rib 7, it enters the baffle or stationary vane installed on the holding ring mounting groove 8, and then proceeds to the rear flow stage of the turbine for work. During the flow process, the steam flow rate entering the rear of the turbine and the steam flow rate entering the throttling extraction port 10 are controlled by adjusting the opening of the regulating valve 11.
[0038] In summary, the present invention provides a cylinder structure for a throttling extraction steam turbine. Compared with the existing cylinder structures for throttling extraction steam turbines, the present invention has many advantages, such as simple processing technology, convenient installation process, small size, flexible application and wide applicability.
[0039] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A cylinder structure for a throttling extraction steam turbine, characterized in that, include: The lower half of the cylinder (1), the upper half of the cylinder (2), the steam seal mounting groove (3), the steam chamber (4), the regulating valve cover mounting seat (5), the regulating valve mounting seat (6), the guide rib (7), the retaining ring mounting groove (8), the drain hole (9), the throttling steam extraction port (10), and the regulating valve (11); After the lower half (1) and upper half (2) of the cylinder are assembled, they together with the steam seal mounting groove (3), the regulating valve cover mounting seat (5), and the regulating valve mounting seat (6) to form the steam chamber (4); the steam seal mounting groove (3), the regulating valve cover mounting seat (5), the regulating valve mounting seat (6), and the retaining ring mounting groove (8) are integrally formed; the guide rib (7) is located on one side of the steam chamber (4), one end of which is connected to the regulating valve cover mounting seat (5), and the other end of which is connected to the regulating valve mounting seat (6); the regulating valve cover mounting seat (5) and the regulating valve mounting seat (6) are used to connect the regulating valve (11), the drain hole (9) is connected to the bottom of the chamber wall of the steam seal mounting groove (3) and the retaining ring mounting groove (8), and the throttling steam extraction port (10) is connected to the steam chamber (4).
2. The cylinder structure of the throttling extraction steam turbine according to claim 1, characterized in that, The regulating valve cover mounting seat (5) and the regulating valve mounting seat (6) are integrally formed with the lower half of the cylinder (1) and smoothly transitioned.
3. The cylinder structure of the throttling extraction steam turbine according to claim 1, characterized in that, The regulating valve cover mounting seat (5) and the regulating valve mounting seat (6) are integrally formed with the upper half of the cylinder (2) and smoothly transitioned.
4. The cylinder structure of the throttling extraction steam turbine according to any one of claims 1-3, characterized in that, The regulating valve (11) is screwed to the regulating valve cover mounting seat (5).
5. The cylinder structure of the throttling extraction steam turbine according to claim 1, characterized in that, The throttling extraction port (10) is located in the lower half (1) or upper half (2) of the cylinder.
6. The cylinder structure of the throttling extraction steam turbine according to claim 5, characterized in that, The number of throttling extraction ports (10) is one or more.
7. The cylinder structure of the throttling extraction steam turbine according to claim 1, characterized in that, The number of regulating valves (11) is one or more.
8. The cylinder structure of the throttling extraction steam turbine according to claim 7, characterized in that, Each chamber may be equipped with a regulating valve (11), or multiple regulating valves (11) may share a chamber.
9. The cylinder structure of the throttling extraction steam turbine according to claim 2, characterized in that, The drainage hole (9) is located on the chamber wall of the lower half of the cylinder (1) or the regulating valve cover mounting seat (5).
10. The cylinder structure of the throttling extraction steam turbine according to claim 9, characterized in that, The number of hydrophobic holes (9) is one or more.