An internal support device for installing a draft tube of a bulb turbine unit

Abstract

The utility model discloses a kind of bulb tubular turbine unit tail water pipe installation internal supporting device, it is related to bulb tubular turbine unit tail water pipe support field, including tail water pipe diffusion section and several split plates inserted in tail water pipe diffusion section, it is characterized by: several split plates are fixed with tail water pipe diffusion section axis as center equiangular distribution and each other, the split plate is contacted with tail water pipe diffusion section inner wall.Affinity effect is in that: the device uses split plate and supporting assembly integration prefabricated structure, the fan-shaped plate of supporting assembly is accurately adapted design according to tail water pipe diffusion section inner wall radian, radius is adjusted corresponding with diffusion section diameter change, realize and the overall surface contact support of inner wall, can completely avoid supporting gap generation and split plate displacement in pouring process, eliminate tail water pipe diffusion section port opening, inner wall depression and other deformation, guarantee water flow passage geometric precision, and then improve unit installation precision and operating stability, improve power generation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tailwater pipe support technology for bulb-type turbine units, specifically to an internal support device for the tailwater pipe installation of bulb-type turbine units. Background Technology

[0002] In the construction of bulb turbine power plants, the tailrace pipe, as a core flow component, directly determines the installation accuracy, operational stability, and power generation efficiency of the unit, making it a critical quality control point in power plant construction. The tailrace pipe diffuser section, with its gradually expanding arc-shaped structure, must withstand the radial compression force of the outer concrete during the second-phase concrete pouring process. Without reliable support, it is highly susceptible to deformation problems such as port opening, inner wall depression, or overall displacement, which can damage the geometric accuracy of the water flow channel, affect the smoothness of water flow during subsequent unit operation, and reduce power generation efficiency.

[0003] Currently, the industry commonly uses traditional rotating support systems such as steel pipe scaffolding and disc-lock scaffolding to support the tailrace diffusion section during construction. However, this method has significant technical drawbacks: Firstly, the support points are discretely distributed, making it difficult to adapt to the gradually curved inner wall contour of the tailrace pipe diffuser section. This results in point or line-type support contact, which easily leads to localized stress concentration. It cannot effectively solve the problem of difficult support on the curved inner surface, resulting in poor support stability and the risk of deformation. Secondly, the erection and dismantling of the support system is complicated, requires a lot of manpower and turnover materials, and occupies construction space for a long time, prolonging the interval between processes and reducing construction efficiency. Third, the traditional support structure has poor fit with the inner wall of the tailpipe, and the support gap is easily generated due to the displacement of the support components during the pouring process, which further aggravates the risk of deformation. Utility Model Content

[0004] The purpose of this utility model is to provide an internal support device for the tailwater pipe installation of a bulb-type turbine generator set in order to solve the above problems, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides an internal support device for the tailwater pipe of a bulb-type turbine generator set, including a tailwater pipe diffuser section and several segmented plates inserted into the tailwater pipe diffuser section. The feature is that the several segmented plates are distributed at equal angles around the axis of the tailwater pipe diffuser section and are fixed to each other, and the segmented plates are in contact with the inner wall of the tailwater pipe diffuser section. A limiting component is fixedly installed at the open end of the tailrace pipe diffuser section to support the port of the tailrace pipe diffuser section and limit the position of the split plate, preventing gaps from forming between the split plate and the inner wall of the tailrace pipe diffuser section.

[0006] Preferably, a support assembly is provided between the split plate and the tailwater diffuser section to support the inner wall of the tailwater diffuser section.

[0007] Preferably, the support assembly includes several sector plates, with several sector plates fixedly connected between two adjacent sector plates, and the radius of the sector plates changes accordingly along the diameter change direction of the tailwater pipe diffuser section, so that all the sector plates are in contact with the inner wall of the tailwater pipe diffuser section.

[0008] Preferably, the split plate has an opening on the side facing the outside of the tailwater diffuser section.

[0009] Preferably, the limiting component includes three main rods arranged in a triangle, which are fixedly connected by several fixing rods. Each of the two ends of the main rods is fixedly connected to a top plate that fits against the inner wall of the tailwater pipe diffuser section, and the top plate is fixedly connected to the tailwater pipe diffuser section by bolts.

[0010] Preferably, a limiting groove is provided on the segmented plate, and the main rod is fitted with the limiting groove with a clearance.

[0011] Preferably, the segmented plate passes through a gap between two adjacent top plates.

[0012] Preferably, a mounting plate is fixedly connected to the main rod, and several auxiliary rods are fixedly installed on the mounting plate. The other end of the auxiliary rods is provided with a slot for insertion into the edge of the tailwater pipe diffuser section.

[0013] The beneficial effects are: 1. This device adopts an integrated prefabricated structure of segmented plates and support components. The fan-shaped plates of the support components are precisely designed to fit the curvature of the inner wall of the tailrace diffuser section. The radius is adjusted accordingly with the diameter of the diffuser section to achieve full-surface contact support with the inner wall, replacing the traditional point support. This significantly disperses the stress on the inner wall and effectively solves the problems of difficult support on the curved inner surface and uneven support points. Combined with the full circumferential support system formed by the equidistant distribution of segmented plates and the radial limiting effect of the limiting components on the segmented plates, it can completely avoid the generation of support gaps and displacement of segmented plates during the pouring process. It can also prevent deformation such as the opening of the tailrace diffuser section port and the concavity of the inner wall, ensuring the geometric accuracy of the water flow channel, thereby improving the installation precision and operational stability of the unit and increasing power generation efficiency.

[0014] 2. The integrated design of the segmented plate and support components allows for direct plug-in installation without the need for complex on-site setup. The limiting components use bolts and plug-in detachable connections. After pouring, the constraints can be released simply by removing the bolts and pulling out the auxiliary rod. The segmented plate can be pulled out directly along the axial direction through the opening structure, greatly simplifying the disassembly and assembly process.

[0015] 3. Both the limiting components and the splitting plates adopt a detachable design, which can be completely recycled after disassembly. They can be reused in multiple tailrace pipe diffusion section construction scenarios, avoiding the problems of high material consumption and resource waste in traditional reusable support systems, and reducing material input costs.

[0016] 4. The limiting component adopts a frame structure composed of a triangular arrangement of main rods and fixed rods. Utilizing the natural deformation resistance of triangles, it provides stable end support for the open end of the tailrace diffusion section, effectively resisting the opening stress at the port during pouring, ensuring that the device is not easily deformed under concrete extrusion load, and adapting to the long-term stable support requirements in complex construction environments.

[0017] 5. The main rod of the limiting component and the limiting groove of the segmented plate are fitted with a clearance, and the segmented plate passes through the gap between the adjacent top plates to achieve precise positioning and installation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a three-dimensional cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the segmented plate of this utility model; Figure 5 This is a three-dimensional structural diagram of the support component of this utility model.

[0020] The annotations in the attached figures are explained as follows: 1. Tailwater pipe diffuser section; 2. Split plate; 201. Limiting groove; 3. Opening; 4. Support assembly; 401. Fan-shaped plate; 5. Limiting assembly; 501. Main rod; 502. Fixing rod; 503. Top plate; 504. Bolt; 505. Secondary rod; 506. Slot; 507. Mounting plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] See Figures 1-5 As shown, this utility model provides an internal support device for the tailwater pipe installation of a bulb-type turbine generator set, including a tailwater pipe diffuser section 1 and a plurality of segmented plates 2 inserted into the tailwater pipe diffuser section 1. The feature is that the plurality of segmented plates 2 are distributed at equal angles around the axis of the tailwater pipe diffuser section 1 and fixed to each other, and the segmented plates 2 are in contact with the inner wall of the tailwater pipe diffuser section 1. A limiting component 5 is fixedly installed at the open end of the tailwater diffuser section 1 to support the port of the tailwater diffuser section 1 and limit the segment plate 2 to prevent gaps from forming between the segment plate 2 and the inner wall of the tailwater diffuser section 1.

[0023] join Figure 3 , 4 as well as Figure 5 A support assembly 4 is provided between the split plate 2 and the tailwater diffuser section 1 to support the inner wall of the tailwater diffuser section 1. The support assembly 4 includes several sector plates 401, and several sector plates 401 are fixedly connected between two adjacent sector plates 401. The radius of the sector plates 401 changes accordingly along the direction of diameter change of the tailwater diffuser section 1, so that all sector plates 401 are in contact with the inner wall of the tailwater diffuser section 1.

[0024] In this embodiment, the segmented plate 2 and the support component 4 adopt an integrated prefabricated structure. The support component has several fan-shaped plates 401 designed to adapt to the inner wall curvature of the tailwater pipe diffuser section 1. The radius of the fan-shaped plates 401 is adjusted accordingly along the diameter change direction of the tailwater pipe diffuser section 1, and adjacent fan-shaped plates 401 are fixedly connected to form an arc-shaped support surface that completely fits the inner contour of the tailwater pipe diffuser section 1. The segmented plates 2 are distributed at equal angles with the axis of the tailwater pipe diffuser section 1 as the center. When inserted, they are guided to be accurately positioned along the inner wall of the diffuser section to ensure that all fan-shaped plates 401 are in close contact with the inner wall of the diffuser section. The arc adaptation design of the fan-shaped plate 401 achieves surface contact support, replacing the traditional point support, dispersing the force on the inner wall of the tailwater pipe diffuser section 1, preventing local pressure deformation during pouring, and the equal angle distribution of the segmented plates 2 further evenly transmits the support force, forming a full circumferential internal support system, providing a reliable internal rigid support foundation for the tailwater pipe diffuser section 1.

[0025] See Figure 5The split plate 2 has an opening 3 on the side facing the outside of the tailwater diffuser section 1. The limiting component 5 includes three main rods 501 arranged in a triangle. The three main rods 501 are fixedly connected by several fixing rods 502. Both ends of the main rods 501 are fixedly connected to a top plate 503 that fits against the inner wall of the tailwater diffuser section 1. The top plate 503 is fixedly connected to the tailwater diffuser section 1 by bolts 504. A limiting groove 201 is opened on the split plate 2, and the main rods 501 are clearance-fitted with the limiting groove 201. There is a gap between two adjacent top plates 503 through which the split plate 2 passes. An mounting plate 507 is fixedly connected to the main rod 501. Several secondary rods 505 are fixedly installed on the mounting plate 507. The other end of the secondary rods 505 has a slot 506 for insertion into the edge of the tailwater diffuser section 1.

[0026] In this embodiment, the limiting component 5 forms a stable triangular support frame through three main rods 501 arranged in a triangle and several fixed rods 502. The triangular structure has natural anti-deformation characteristics. After the top plates 503 at both ends of the main rods 501 are attached to the inner wall of the tailwater pipe diffuser section 1, they are fixed to the diffuser section by bolts 504 to form an end support reference. At the same time, the main rods 501 are fitted with the limiting grooves 201 on the split plates 2 with a clearance. The split plates pass through the gaps of the adjacent top plates 503 to achieve radial limiting of the split plates. The auxiliary rods 505 are inserted into the edge of the tailwater pipe diffuser section 1 through the slots 506 to further strengthen the connection between the limiting component 5 and the diffuser section. Furthermore, the triangular frame structure limiting component 5 provides end support for the open end of the tailwater pipe diffuser section 1, preventing the port from opening and deforming due to force during pouring. The cooperation between the main rod and the limiting groove restricts the radial displacement of the segment plate 2, avoiding gaps between the segment plate 2 and the inner wall of the tailwater pipe, ensuring that the support force is continuously effective. The insertion design of the auxiliary rod and the edge of the diffuser section enhances the fixing reliability of the limiting component itself, preventing the limiting component from loosening and failing, and completely eliminating the displacement and deformation of the tailwater pipe diffuser section 1 during the pouring process. Specifically, the limiting component 5 and the tailwater pipe diffuser section 1 are connected by bolts 504 and plug-in detachable connection. After the concrete is poured and reaches the design strength, the bolts 504 are removed to separate the top plate 503 from the inner wall of the diffuser section. Then, the slot 506 of the auxiliary rod 505 is pulled out and plugged into the edge of the diffuser section to release the constraint of the limiting component on the split plate. At this time, the split plate loses the radial limitation and can be directly pulled out along the axial direction.

[0027] Function: The detachable design allows for the reuse of the limiting components, reducing construction costs. It precisely releases the limiting constraints on the segmented plate, ensuring that the segmented plate is disassembled without jamming. This avoids scratching the inner wall of the tailpipe or damaging the poured concrete during disassembly. The early removal of the limiting components leaves sufficient operating space for the segmented plate removal, ensuring an efficient and convenient disassembly process.

[0028] Working principle: The split plate 2 and the support component 4 are integrated. The split plate 2 is inserted into the tailwater pipe diffuser section 1. The split plate 2 and the support component 4 support the inside of the tailwater pipe diffuser section 1. Then, the limiting component 5 is fixedly installed at the end of the tailwater pipe diffuser section 1 to limit the split plate 2 and prevent the split plate 2 from displacing. This allows the split plate 2 to continuously support the inner wall of the tailwater pipe diffuser section 1. At the same time, the limiting component 5 can also support the edge of the tailwater pipe diffuser section 1. After the pouring is completed, the limiting component 5 is removed, and the split plate 2 can be directly removed from the tailwater diffuser section 1.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An internal support device for the tailrace pipe of a bulb turbine generator set, comprising a tailrace pipe diffuser section and a plurality of segmented plates inserted into the tailrace pipe diffuser section, characterized in that: Several segmented plates are distributed at equal angles around the axis of the tailwater diffuser section and fixed to each other, and the segmented plates are in contact with the inner wall of the tailwater diffuser section. A limiting component is fixedly installed at the open end of the tailrace pipe diffuser section to support the port of the tailrace pipe diffuser section and limit the position of the split plate, preventing gaps from forming between the split plate and the inner wall of the tailrace pipe diffuser section.

2. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 1, characterized in that: A support assembly is provided between the split plate and the tailwater diffuser section to support the inner wall of the tailwater diffuser section.

3. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 2, characterized in that: The support assembly includes several sector plates, with several sector plates fixedly connected between two adjacent sector plates. The radius of the sector plates changes accordingly along the diameter change direction of the tailwater pipe diffuser section, so that all the sector plates are in contact with the inner wall of the tailwater pipe diffuser section.

4. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 1, characterized in that: The split plate has an opening on the side facing the outside of the tailwater diffuser section.

5. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 4, characterized in that: The limiting component includes three main rods arranged in a triangle. The three main rods are fixedly connected by several fixing rods. Each of the two ends of the main rods is fixedly connected to a top plate that fits against the inner wall of the tailwater pipe diffuser section. The top plate is fixedly connected to the tailwater pipe diffuser section by bolts.

6. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 5, characterized in that: A limiting groove is provided on the segmented plate, and the main rod is fitted with the limiting groove with a clearance.

7. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 5, characterized in that: The segmented plate passes through a gap between two adjacent top plates.

8. The internal support device for the tailrace pipe installation of a bulb-type turbine generator unit according to claim 5, characterized in that: A mounting plate is fixedly connected to the main rod, and several auxiliary rods are fixedly installed on the mounting plate. The other end of the auxiliary rods is provided with a slot for insertion into the edge of the tailwater pipe diffuser section.

Images