Split sand core for casting high pressure vane ring of thermal power
By using a split sand core design and a buffer structure, the stability and convenience issues in the fabrication of ring sand cores for high-voltage blades in thermal power plants were resolved, achieving efficient production and a low scrap rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAONING FU-AN HEAVY INDUSTRY CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-31
AI Technical Summary
Existing technologies make it difficult to stably manufacture sand cores for high-voltage blade rings in thermal power plants, especially for air passage cores which are small in size and require high strength and resilience, leading to difficulties in repair and affecting production efficiency and economic benefits.
The design adopts a split sand core, dividing the traditional integral sand core into three parts: front, middle, and rear. These parts are welded together with a core frame to form an integral sand core. Combined with buffer sheets, buffer plates, and buffer strips, the fit is improved, ensuring the stability and convenience of the sand core.
This method achieves stable dimensions, sufficient strength, and good yielding properties in sand core production, reducing the scrap rate of sand cores and improving production efficiency and economic benefits.
Smart Images
Figure CN224574638U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of production technology of split sand cores for casting high-voltage blade rings in thermal power plants, specifically a split sand core for casting high-voltage blade rings in thermal power plants. Background Technology
[0002] High-pressure blades are key components of steam turbines in thermal power units, and their performance directly affects the safety, economy, and environmental performance of these units. With my country's rapid economic development and continuous growth in energy demand, thermal power still occupies an important position in the energy structure. The improvement of thermal power unit technology has led to an increased demand for high-performance high-pressure blades.
[0003] However, for high-voltage blade ring castings in thermal power plants, the sand cores forming the internal air passages are small and difficult to manufacture. High requirements are placed on the core strength and sand mold collapsibility. Moreover, once the air passage core is damaged, repair is difficult and the entire core may become unusable and need to be remade. Therefore, the manufacture of cores and sand cores has always been a challenge in casting technology. To overcome this challenge, we have developed a split sand core for casting high-voltage blade rings in thermal power plants to ensure stable sand core quality, provide support for the production of high-voltage blade rings in thermal power plants, reduce the scrap rate of sand cores, and achieve high economic benefits. Utility Model Content
[0004] The purpose of this invention is to provide a split sand core for casting high-voltage blade rings in thermal power plants, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a split sand core for casting high-voltage blade rings in thermal power plants, comprising a base, a rear sand core disposed on the upper surface of the base, a middle sand core disposed on the top of the rear sand core, and a front sand core disposed on the top of the middle sand core.
[0006] A square tube is fixedly installed on the upper surface of the base, and a baffle is fixedly installed on the top of the square tube. A cavity is opened inside the front sand core, and a buffer sheet is fixedly installed on the inner bottom wall of the cavity. A buffer plate is fixedly installed on the top of the buffer sheet, and a buffer strip is fixedly installed on the top of the buffer plate. The top of the buffer strip passes through the front sand core and extends to the outside of the front sand core. The buffer sheet, buffer plate, and buffer strip improve the fit between the rear sand core, middle sand core, and front sand core during use, thereby facilitating subsequent use and improving the ease of use of the sand core.
[0007] Preferably, the top of the buffer strip contacts the bottom of the baffle, and the top of the front sand core is provided with a through groove for the buffer strip to pass through, and the inner wall of the through groove is slidably connected to the surface of the buffer strip.
[0008] Preferably, the inner wall of the cavity of the front sand core is slidably connected to the surface of the buffer plate, and the buffer plate is adapted to the cavity.
[0009] Preferably, a support rod is fixedly installed on the bottom of the base and one side of the baffle, and a support block is threadedly connected to the bottom of the support rod, with anti-slip texture on the bottom of the support block.
[0010] Preferably, the bottom of the middle sand core is inserted into the interior of the rear sand core, and the surface of the middle sand core is in contact with the inner wall of the rear sand core.
[0011] Preferably, a support ring is fixedly installed on one side of the middle sand core, and an arc plate is fixedly installed on one side of the support ring. The traditional thermal power high-voltage blade ring integral sand core is manufactured separately as front, middle (gas passage) and rear, and then welded into an integral sand core by core skeleton, so as to realize the production of thermal power high-voltage blade ring, so that the sand core manufacturing dimensions are stable, the manufactured sand core has sufficient strength and good yielding.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] (1) The split sand core for casting high-voltage blade rings of thermal power plants is made by manufacturing the traditional high-voltage blade ring integral sand core in the form of front, middle (gas passage) and rear parts, and then welding the core to form an integral sand core, so as to realize the production of high-voltage blade rings of thermal power plants. This makes the sand core manufacturing dimensions stable, the sand core strength sufficient, and the yielding property good.
[0014] (2) The split sand core for casting high-voltage blade rings of thermal power plants improves the fit between the rear sand core, middle sand core and front sand core during use by setting buffer plates, buffer plates and buffer strips, thereby facilitating subsequent use and improving the ease of use of the sand core. Attached Figure Description
[0015] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;
[0016] Figure 2 This is a two-dimensional structural diagram of the present invention from a second perspective;
[0017] Figure 3 This is a three-dimensional structural diagram of the front sand core of this utility model;
[0018] Figure 4 This is a three-dimensional cross-sectional view of the front sand core of this utility model.
[0019] In the diagram: 1. Base; 2. Rear sand core; 3. Middle sand core; 4. Front sand core; 5. Square tube; 6. Baffle; 7. Buffer plate; 8. Buffer plate; 9. Buffer strip; 10. Support rod; 11. Support block; 12. Support ring; 13. Arc plate. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figure 1-4 This utility model provides a technical solution: a split sand core for casting high-voltage blade rings for thermal power plants, including a base 1, with support rods 10 fixedly installed on the bottom of the base 1 and one side of the baffle 6. The bottom of the support rods 10 is threadedly connected to a support block 11, and the bottom of the support block 11 is provided with anti-slip texture. A rear sand core 2 is provided on the upper surface of the base 1, a middle sand core 3 is provided on the top of the rear sand core 2, and a front sand core 4 is provided on the top of the middle sand core 3. The bottom of the middle sand core 3 is inserted into the interior of the rear sand core 2, and the surface of the middle sand core 3 is in contact with the inner wall of the rear sand core 2. A support ring 12 is fixedly installed on one side of the middle sand core 3, and an arc plate 13 is fixedly installed on one side of the support ring 12. The traditional integral sand core for high-voltage blade rings of thermal power plants is manufactured as a front, middle and rear split, and then welded into an integral sand core by core reinforcement, realizing the production of high-voltage blade rings for thermal power plants. This makes the dimensions of the sand core stable, the strength of the manufactured sand core sufficient, and the yielding good.
[0022] A square tube 5 is fixedly installed on the upper surface of the base 1. A baffle 6 is fixedly installed on the top of the square tube 5. A cavity is opened inside the front sand core 4. A buffer sheet 7 is fixedly installed on the inner bottom wall of the cavity. A buffer plate 8 is fixedly installed on the top of the buffer sheet 7. A buffer strip 9 is fixedly installed on the top of the buffer plate 8. The top of the buffer strip 9 passes through the front sand core 4 and extends to the outside of the front sand core 4. The buffer sheet 7, buffer plate 8 and buffer strip 9 improve the fit between the rear sand core 2, middle sand core 3 and front sand core 4 during use, thereby facilitating subsequent use and improving the ease of use of the sand core. The top of the buffer strip 9 contacts the bottom of the baffle 6. A through groove is opened on the top of the front sand core 4 for the buffer strip 9 to pass through. The inner wall of the through groove is slidably connected to the surface of the buffer strip 9.
[0023] Working principle: In use, the traditional thermal power high-voltage blade ring integral sand core is manufactured in three parts: front, middle (gas passage) and rear. Then, the core is welded together to form an integral sand core, realizing the production of thermal power high-voltage blade ring. The total length of the assembled sand core is 1480×1048×1145mm. The front sand core 4 has a size of 995×900×1042mm, the middle sand core 3 has a size of 256×1106×585mm, and the rear sand core 2 has a size of 480×1048×1116mm. The core is made of 30×30mm square steel with pre-reserved welding points in the sand core. Following the normal method of making core boxes, the wooden pattern is first placed on the platform, and then the sand pattern is formed. After the sand pattern hardens, the mold is removed, and then the sand cores are welded together before the core is installed.
Claims
1. A split sand core for casting a high pressure vane ring of a steam turbine, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a rear sand core (2), the top of the rear sand core (2) is provided with a middle sand core (3), and the top of the middle sand core (3) is provided with a front sand core (4). A square tube (5) is fixedly installed on the upper surface of the base (1), and a baffle (6) is fixedly installed on the top of the square tube (5). A cavity is opened inside the front sand core (4), and a buffer plate (7) is fixedly installed on the inner bottom wall of the cavity. A buffer plate (8) is fixedly installed on the top of the buffer plate (7), and a buffer strip (9) is fixedly installed on the top of the buffer plate (8). The top of the buffer strip (9) penetrates the front sand core (4) and extends to the outside of the front sand core (4).
2. A split sand core for casting a high pressure vane ring of a thermal power plant according to claim 1, characterized in that: The top of the buffer strip (9) contacts the bottom of the baffle (6), and the top of the front sand core (4) is provided with a through groove for the buffer strip (9) to pass through. The inner wall of the through groove is slidably connected to the surface of the buffer strip (9).
3. A split sand core for casting a high pressure vane ring of a thermal power plant according to claim 1, characterized in that: The inner wall of the cavity of the front sand core (4) is slidably connected to the surface of the buffer plate (8), and the buffer plate (8) is adapted to the cavity.
4. The split sand core for casting a high pressure vane ring of a thermal power plant according to claim 1, characterized in that: Support rods (10) are fixedly installed on the bottom of the base (1) and one side of the baffle (6). Support blocks (11) are threadedly connected to the bottom of the support rods (10). Anti-slip textures are provided on the bottom of the support blocks (11).
5. A split sand core for casting a high pressure vane ring of a thermal power plant as claimed in claim 1, wherein: The bottom of the middle sand core (3) is inserted into the interior of the rear sand core (2), and the surface of the middle sand core (3) is in contact with the inner wall of the rear sand core (2).
6. A split sand core for casting high-voltage blade rings in thermal power plants according to claim 1, characterized in that: A support ring (12) is fixedly installed on one side of the medium sand core (3), and an arc plate (13) is fixedly installed on one side of the support ring (12).