A multi-capability complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part
By installing hard alloy reinforcing blocks and arc-shaped protrusions on the upper and lower shell cast steel parts of the intermediate pressure inner cylinder of the ultra-supercritical steam turbine unit, the problems of gaps and unstable air pressure caused by unreasonable structure were solved, the service life was extended and the heat preservation effect was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU KAICHENG MACHINERY
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-14
AI Technical Summary
The existing ultra-supercritical steam turbine unit has an unreasonable intermediate pressure inner cylinder structure design, which results in large kinetic energy of the piston impacting the end cover, easy gaps at the connection, unstable gas pressure, shortened service life, and lack of effective heat preservation structure.
The upper and lower shells were designed with cast steel components. A combination of hard alloy reinforcing blocks, positioning notches, sealing ring mounting grooves, and anti-fooling slots was used to increase connection reliability. Arc-shaped protrusions and through holes for connecting insulation blocks were set on the shell surface to improve positioning accuracy and insulation effect.
It achieves a reliable connection between the upper and lower shells, reduces gaps, extends service life, and makes the insulation block easy to install, thus improving practicality.
Smart Images
Figure CN224496539U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steam turbine technology, specifically to a cast steel part for the intermediate pressure inner cylinder of a multi-energy complementary ultra-supercritical steam turbine unit. Background Technology
[0002] A medium-pressure inner cylinder is a component that uses compressed air as a power source to drive a mechanism to perform linear, oscillating, or rotary motion. Pneumatic transmission is an engineering technology that uses an air compressor as a power source and compressed air as a working medium to transmit energy or signals. It has the advantages of simple structure, low cost, safety and reliability, and environmental protection and energy saving. Inner cylinders can be divided into various types such as linear inner cylinders, rotary drive inner cylinders, clamping inner cylinders, and mechanical fingers, depending on their shape, motion mode, and working pressure.
[0003] Currently, the existing intermediate-pressure inner cylinder structure of ultra-supercritical steam turbine units still has shortcomings: the structural design is unreasonable, and when the intermediate-pressure inner cylinder starts, the kinetic energy of the piston hitting the end cover may be very large. Small gaps may easily appear at the connection between the upper and lower cast steel parts of the intermediate-pressure inner cylinder, resulting in unstable gas pressure and shortening the service life of the intermediate-pressure inner cylinder. In addition, the existing intermediate-pressure inner cylinder of ultra-supercritical steam turbine units lacks a heat insulation block connection structure between the upper and lower cast steel parts, resulting in poor practicality. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-energy complementary cast steel inner cylinder for ultra-supercritical steam turbine units with reasonable structural design, reliable connection between the upper and lower shells, less prone to gaps, long service life and good practicality.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a cast steel part for the intermediate pressure inner cylinder of a multi-energy complementary ultra-supercritical steam turbine unit, including an upper shell cast steel part and a lower shell cast steel part. The lower end face of the upper shell cast steel part is provided with a first positioning notch, a first sealing ring mounting groove and a first anti-fooling slot from the inside to the outside. A first hard alloy reinforcing block is fixedly installed in the first positioning notch. A plurality of first limiting grooves and a plurality of first limiting protrusions are provided on the lower end face of the first hard alloy reinforcing block.
[0006] The upper end face of the lower housing cast steel part is provided with a second positioning notch, a second sealing ring mounting groove and a first anti-fooling protrusion from the inside to the outside. A second hard alloy reinforcing block is fixedly installed in the second positioning notch. A number of second limiting grooves and a number of second limiting protrusions are provided on the upper end face of the second hard alloy reinforcing block.
[0007] The second limiting protrusion is inserted into the aligned first limiting groove, and the first limiting protrusion is inserted into the aligned second limiting groove.
[0008] The present invention is further configured such that: the first cemented carbide reinforcing block is welded and fixed to the inner wall surface of the first positioning notch; the first limiting groove and the first limiting protrusion are both provided with more than two on the lower end surface of the first cemented carbide reinforcing block, and the first limiting groove and the first limiting protrusion are provided at intervals.
[0009] The present invention is further configured such that: the second cemented carbide reinforcing block is welded and fixed to the inner wall surface of the second positioning notch; the second limiting groove and the second limiting protrusion are both provided with more than two on the upper end surface of the second cemented carbide reinforcing block, and the second limiting groove and the second limiting protrusion are provided at intervals.
[0010] The present invention is further configured such that: a plurality of first arc-shaped protrusions are integrally provided on the outer surface of the upper shell cast steel part, and each first arc-shaped protrusion is provided with a plurality of upper insulation block connecting through holes; a plurality of second arc-shaped protrusions are integrally provided on the outer surface of the lower shell cast steel part, and each second arc-shaped protrusion is provided with a plurality of lower insulation block connecting through holes.
[0011] The present invention is further configured such that: both the left and right ends of the upper housing cast steel part are integrally provided with upper connecting protrusions, and the upper end surface of the upper connecting protrusions is provided with a plurality of upper bolt through holes; both the left and right ends of the lower housing cast steel part are integrally provided with lower connecting protrusions, and the lower end surface of the lower connecting protrusions is provided with a plurality of lower bolt screw holes, and the lower bolt through holes are aligned with the upper bolt through holes.
[0012] The present invention is further configured such that: the lower end of the lower housing cast steel part is integrally provided with an air extraction pipe and a bracket connecting protrusion, and the lower end surface of the bracket connecting protrusion is provided with a plurality of threaded blind holes.
[0013] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model has a reasonable structural design. The lower end face of the upper shell cast steel part is provided with a first positioning notch, a first sealing ring mounting groove and a first anti-fooling slot from the inside to the outside. The first hard alloy reinforcing block is welded and fixed to the inner wall surface of the first positioning notch. The upper end face of the lower shell cast steel part is provided with a second positioning notch, a second sealing ring mounting groove and a first anti-fooling protrusion from the inside to the outside. The second hard alloy reinforcing block is welded and fixed to the inner wall surface of the second positioning notch. The second limiting protrusion is inserted into the aligned first limiting groove, and the first limiting protrusion is inserted into the aligned second limiting groove. The hard alloy reinforcing block has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, which makes the connection between the upper and lower shell cast steel parts reliable, less prone to gaps, and long service life.
[0014] In addition, the arc-shaped protrusions and the through holes connecting the insulation blocks ensure reliable positioning, convenient operation, and good practicality when installing existing insulation blocks or insulation layers on the outer surface of each cast steel shell component.
[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0017] Figure 2 for Figure 1 Enlarged schematic diagram of section I;
[0018] Figure 3 This is an exploded view of an embodiment of the present invention;
[0019] Figure 4 This is a partial explosion diagram of an embodiment of the present invention;
[0020] Figure 5 This is a schematic diagram of the upper shell cast steel component according to an embodiment of the present utility model;
[0021] Figure 6 This is a schematic diagram of the cast steel shell component in an embodiment of this utility model. Detailed Implementation
[0022] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] See Figures 1 to 6 This utility model discloses a multi-energy complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part, including upper shell cast steel part 1 and lower shell cast steel part 2. The lower end face of the upper shell cast steel part 1 is provided with a first positioning notch 11, a first sealing ring mounting groove 12 and a first anti-fooling slot 13 from the inside to the outside. A first hard alloy reinforcing block 3 is fixedly provided in the first positioning notch 11. A plurality of first limiting grooves 31 and a plurality of first limiting protrusions 32 are provided on the lower end face of the first hard alloy reinforcing block 3.
[0024] The upper end face of the lower housing cast steel part 2 is provided with a second positioning notch 21, a second sealing ring mounting groove 22 and a first anti-fooling protrusion 23 from the inside to the outside. A second hard alloy reinforcing block 4 is fixedly installed in the second positioning notch 21. A plurality of second limiting grooves 41 and a plurality of second limiting protrusions 42 are provided on the upper end face of the second hard alloy reinforcing block 4.
[0025] The second limiting protrusion 42 is inserted into the aligned first limiting groove 31, and the first limiting protrusion 32 is inserted into the aligned second limiting groove 41.
[0026] Preferably, the first anti-mistake protrusion 23 is aligned with the first anti-mistake slot 13. When the upper housing cast steel part 1 and the lower housing cast steel part 2 are assembled, the first anti-mistake protrusion 23 is inserted into the first anti-mistake slot 13 to play an anti-mistake role.
[0027] The first cemented carbide reinforcing block 3 is welded and fixed to the inner wall surface of the first positioning notch 11; the first limiting groove 31 and the first limiting protrusion 32 are provided in more than two on the lower end surface of the first cemented carbide reinforcing block 3, and the first limiting groove 31 and the first limiting protrusion 32 are spaced apart.
[0028] The second cemented carbide reinforcing block 4 is welded and fixed to the inner wall surface of the second positioning notch 21. The second cemented carbide reinforcing block 4 has more than two second limiting grooves 41 and two limiting protrusions 42 on its upper end surface, and the second limiting grooves 41 and the second limiting protrusions 42 are spaced apart.
[0029] To make the structural design of this utility model more reasonable, as a preferred embodiment, the outer surface of the upper shell cast steel part 1 is integrally provided with a plurality of first arc-shaped protrusions 14, each first arc-shaped protrusion 14 being provided with a plurality of upper insulation block connecting through holes 141; the outer surface of the lower shell cast steel part 2 is integrally provided with a plurality of second arc-shaped protrusions 24, each second arc-shaped protrusion 24 being provided with a plurality of lower insulation block connecting through holes 241.
[0030] The upper housing cast steel part 1 has an integral upper connecting protrusion 15 at both ends. The upper end surface of the upper connecting protrusion 15 has a plurality of upper bolt through holes 151. The lower housing cast steel part 2 has an integral lower connecting protrusion 25 at both ends. The lower end surface of the lower connecting protrusion 25 has a plurality of lower bolt screw holes 251, and the lower bolt through holes 251 are aligned with the upper bolt through holes 151.
[0031] The lower end of the cast steel lower housing 2 is integrally provided with an air extraction pipe 26 and a bracket connecting protrusion 27, and the lower end surface of the bracket connecting protrusion 27 is provided with a number of threaded blind holes.
[0032] In practical applications, the lower end face of the upper shell cast steel part 1 is provided with a first positioning notch 11, a first sealing ring mounting groove 12 and a first anti-fooling slot 13 from the inside to the outside. The first hard alloy reinforcing block 3 is welded and fixed to the inner wall of the first positioning notch 11. The upper end face of the lower shell cast steel part 2 is provided with a second positioning notch 21, a second sealing ring mounting groove 22 and a first anti-fooling protrusion 23 from the inside to the outside. The second hard alloy reinforcing block 4 is welded and fixed to the inner wall of the second positioning notch 21. The second limiting protrusion 42 is inserted into the aligned first limiting groove 31 and the first limiting protrusion 32 is inserted into the aligned second limiting groove 41. The structure is reasonably designed, and the hard alloy reinforcing block has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, which makes the connection between the upper and lower shell cast steel parts reliable, less prone to gaps, and long service life.
[0033] In addition, 1-4 first arc-shaped protrusions 14 are integrally provided on the outer surface of the upper shell cast steel part 1, and each first arc-shaped protrusion 14 is provided with 3-6 upper insulation block connecting through holes 141; 1-4 second arc-shaped protrusions 24 are integrally provided on the outer surface of the lower shell cast steel part 2, and each second arc-shaped protrusion 24 is provided with 3-6 lower insulation block connecting through holes 241. The arc-shaped protrusions and insulation block connecting through holes make the positioning reliable, the operation convenient, and the practicality good when installing existing insulation blocks or insulation layers on the outer surface of each shell cast steel part.
[0034] The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by technical engineers based on the above description of the utility model shall fall within the scope of protection of this utility model.
Claims
1. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel piece, comprising an upper shell cast steel piece (1) and a lower shell cast steel piece (2), characterized in that: The lower end face of the upper shell cast steel part (1) is provided with a first positioning notch (11), a first sealing ring mounting groove (12) and a first anti-fooling slot (13) from the inside to the outside. A first hard alloy reinforcing block (3) is fixedly provided in the first positioning notch (11). A plurality of first limiting grooves (31) and a plurality of first limiting protrusions (32) are provided on the lower end face of the first hard alloy reinforcing block (3). The upper end face of the lower housing cast steel part (2) is provided with a second positioning notch (21), a second sealing ring mounting groove (22) and a first anti-fooling protrusion (23) from the inside to the outside. A second hard alloy reinforcing block (4) is fixedly provided in the second positioning notch (21). A number of second limiting grooves (41) and a number of second limiting protrusions (42) are provided on the upper end face of the second hard alloy reinforcing block (4). The second limiting protrusion (42) is inserted into the aligned first limiting groove (31), and the first limiting protrusion (32) is inserted into the aligned second limiting groove (41).
2. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part according to claim 1, characterized in that: The first hard alloy reinforcing block (3) is welded and fixed to the inner wall surface of the first positioning notch (11); the first limiting groove (31) and the first limiting protrusion (32) on the lower end surface of the first hard alloy reinforcing block (3) are each provided in more than two ways, and the first limiting groove (31) and the first limiting protrusion (32) are provided at intervals.
3. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part according to claim 2, characterized in that: The second cemented carbide reinforcing block (4) is welded and fixed to the inner wall of the second positioning notch (21). The second limiting groove (41) and the second limiting protrusion (42) on the upper end surface of the second cemented carbide reinforcing block (4) are each provided with more than two, and the second limiting groove (41) and the second limiting protrusion (42) are provided at intervals.
4. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part according to claim 3, characterized in that: The outer surface of the upper shell cast steel part (1) is integrally provided with a plurality of first arc-shaped protrusions (14), each first arc-shaped protrusion (14) being provided with a plurality of upper insulation block connecting through holes (141); the outer surface of the lower shell cast steel part (2) is integrally provided with a plurality of second arc-shaped protrusions (24), each second arc-shaped protrusion (24) being provided with a plurality of lower insulation block connecting through holes (241).
5. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part according to claim 4, characterized in that: The upper housing cast steel part (1) is integrally provided with upper connecting protrusions (15) at both ends. The upper end surface of the upper connecting protrusions (15) is provided with several upper bolt through holes (151). The lower housing cast steel part (2) is integrally provided with lower connecting protrusions (25) at both ends. The lower end surface of the lower connecting protrusions (25) is provided with several lower bolt screw holes (251), and the lower bolt through holes (251) are aligned with the upper bolt through holes (151).
6. A multi-function complementary ultra-supercritical steam turbine unit intermediate pressure inner cylinder cast steel part according to claim 5, characterized in that: The lower end of the cast steel part (2) of the lower shell is integrally provided with an air extraction pipe (26) and a bracket connecting protrusion (27), and a number of threaded blind holes are provided on the lower end surface of the bracket connecting protrusion (27).