Large mixed-flow type runner blade safety protection device

Abstract

The utility model discloses a safety protection device for a large mixed-flow type runner blade. The device is of an annular structure and surrounds the peripheral area of a blade above a lower anti-leakage ring of a runner. The lower half portion of each protection module is provided with a screen plate assembly, and the upper half portion of each protection module is provided with a handrail assembly. The handrail assembly is detachably fixed to the top of the net plate assembly through the installation piece and the fastening piece, modular assembly is achieved, the characteristic of convenient installation and maintenance is achieved, and then the working efficiency is improved. According to the device, through reasonable structural design, effective safety protection at the runner blade inlet is achieved, the edge operation risk is remarkably reduced, overhauling tools are effectively prevented from falling into a runner chamber, the operation safety is greatly improved, and a solid guarantee is provided for completing overhauling and updating and transformation tasks in a high-quality mode.

Description

Technical Field

[0001] This utility model relates to the technical field of turbine blade maintenance and protection devices, and in particular to a safety protection device for large mixed-flow turbine blades. Background Technology

[0002] During the overhaul and renovation of a large mixed-flow turbine unit, maintenance personnel need to perform multiple maintenance tasks at the bottom ring of the volute, such as measuring the clearance of the movable guide vane end face, measuring the clearance of the runner's lower sealing ring, and corrosion protection of flow components. Maintenance work on the bottom ring is considered edge work; without edge protection, workers face a significant risk of falling. Therefore, designing and manufacturing a safety protection device suitable for the working environment at the runner blade inlet is crucial. Existing devices, such as the "Safety Device for Runner Blades of Large Hydro-Generating Units" (announcement number CN213980228U), provide a ring-shaped guardrail around the runner blades, but the following problems still exist:

[0003] 1. Insufficient safety of protective structure: The device is only equipped with a single layer of openwork guardrail. From the perspective of fall prevention, the height of the existing guardrail cannot meet the safety protection requirements, and the spacing of the openwork structure is too large, making it difficult to effectively prevent people from falling accidentally, which poses a significant safety risk.

[0004] 2. Significant risk of tool falls: The large-sized, openwork guardrail structure creates multiple gaps in the protection. During equipment maintenance breaks, tools can easily fall through these gaps into the area below the impeller blades. This could not only lead to tool damage or loss, prolonging maintenance time and reducing work efficiency, but also cause damage to mechanical parts or injuries to personnel due to falling tools, further exacerbating on-site safety hazards. Utility Model Content

[0005] This utility model provides a safety protection device for large mixed-flow turbine blades, which aims to solve the aforementioned defects.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A large mixed-flow impeller blade safety protection device includes an annular device body surrounding the outer periphery of the blades above the lower leak-proof ring of the impeller. It is composed of multiple protection modules, each with a mesh panel assembly in the lower half and a guardrail assembly in the upper half. The guardrail assembly is detachably fixed to the top of the mesh panel assembly using mounting hardware and fasteners, achieving modular assembly.

[0008] Preferably, each of the mesh plate assemblies includes a trapezoidal arc-shaped fixing frame welded together. The arc-shaped fixing frame is concentric and coaxial with the rotor blades, and an arc-shaped mesh plate is welded and fixed on the side of the arc-shaped fixing frame away from the rotor blades. The arc-shaped mesh plate is in close contact with the arc-shaped fixing frame.

[0009] More preferably, the bottom and top of the arc-shaped fixing frame are provided with an upper arc-shaped rod and a lower arc-shaped rod that are parallel to each other. Several connecting rods are welded between the upper arc-shaped rod and the lower arc-shaped rod. The upper arc-shaped rod is fixed to the lower arc-shaped rod through the connecting rods. The upper arc-shaped rod and the lower arc-shaped rod cooperate to form a ladder-shaped structure through the connecting rods. The upper arc-shaped rod and the lower arc-shaped rod have the same length and the starting position of the upper arc-shaped rod and the lower arc-shaped rod are the same.

[0010] Furthermore, the aperture of the arc-shaped mesh plate is smaller than the size of the smallest turbine blade maintenance tool.

[0011] Furthermore, the railing assembly includes several mounting parts arranged at equal intervals along the upper arc-shaped bar. Several mounting holes are provided at equal intervals on the top of the mounting parts. The mounting holes on adjacent mounting parts correspond one-to-one. The same railing arc-shaped bar is embedded and welded into the corresponding mounting holes. Several railing arc-shaped bars and mounting parts cooperate to form a railing.

[0012] Specifically, the bottom of the mounting component is provided with a support component, which has an inverted U-shaped structure. The support component hangs upside down on the upper arc-shaped rod. Both sides of the support component are provided with threaded holes, and limit screws are installed in the threads of the threaded holes. After the limit screws are tightened, they form a clamping and limiting fixation with the arc-shaped mesh plate.

[0013] More specifically, a support plate perpendicular to the top of the support member is welded and fixed to the top of the support member. The support plate is provided with a plurality of mounting holes evenly distributed along the vertical direction of the support plate. The mounting holes on adjacent support plates correspond one-to-one. The corresponding mounting holes are penetrated by the same railing arc rod. The railing arc rod is welded and fixed to the corresponding mounting hole, and the railing arc rod and the support plate cooperate to form a railing.

[0014] In detail, the centers of the corresponding mounting holes are located on the same circular track, the lengths of the arc-shaped railings of the same mesh panel assembly are the same, the starting positions of the arc-shaped railings of the same mesh panel assembly are the same, and the arc-shaped railings are all parallel to the upper arc-shaped railing.

[0015] More specifically, both ends of the upper arc-shaped rod, the lower arc-shaped rod, and the railing arc-shaped rod are respectively provided with a butt joint and a butt sleeve;

[0016] The joints of the lower arc-shaped rods are sequentially embedded in the mating sleeves of adjacent lower arc-shaped rods, and the lower arc-shaped rods are spliced ​​together to form a ring;

[0017] The joints of the upper arc-shaped rods are also sequentially embedded in the mating sleeves of the adjacent upper arc-shaped rods, and the upper arc-shaped rods are spliced ​​together to form a ring;

[0018] The joints of the curved railing bars located on the same circular track are also sequentially embedded in the mating sleeves of the adjacent curved railing bars, and the curved railing bars are spliced ​​together to form a ring.

[0019] Preferably, both the connector and the mating sleeve are provided with pin holes in the radial direction. When the connector is embedded in the corresponding mating sleeve, the pin holes on the connector and the corresponding mating sleeve overlap and are locked by passing through the limiting pin.

[0020] The beneficial effects of this utility model are as follows:

[0021] (1) Double-layer protective structure enhances safety protection: By setting up a double-layer guardrail structure, the overall protection height is significantly increased on the original basis, forming a three-dimensional fall protection barrier, which greatly reduces the risk of accidental falls from the physical level and significantly enhances the safety of the work site;

[0022] (2) Layered design achieves dual protection function:

[0023] A. Lower mesh panel assembly: The mesh panel structure design precisely reduces the gap between the cutouts, forming a high-density protective interface. It can effectively intercept tools that accidentally slip during maintenance, preventing tools from falling through the gaps to the bottom of the impeller blades. This reduces tool loss and wear, and also lowers the risk of mechanical damage or personal injury caused by falling tools, thus improving both safety and maintenance efficiency.

[0024] B. Upper railing assembly: Continuing the advantages of traditional railing protection, through reasonable height and spacing design, it further enhances the protection against falls for personnel, forming a composite protection system that links the upper and lower layers with the lower mesh panel, ensuring all-round work safety;

[0025] (3) Modular split design innovates work efficiency: Breaking through the limitations of the integrated structure of the traditional rotor blade protection net, the innovative split modular design is adopted. Each component can be disassembled and assembled independently and flexibly combined. This design not only greatly simplifies the installation and disassembly process, but also enables rapid on-site splicing through standardized components, effectively shortening the overall maintenance period and providing strong technical support for the lean and efficient maintenance of the unit. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the entire installation of this utility model;

[0027] Figure 2 This is a side view of a single protective module of this utility model;

[0028] Figure 3 This is a schematic diagram of the other side of a single protective module of this utility model;

[0029] Figure 4 This is a schematic diagram showing the disassembly of a single protective module of this utility model;

[0030] Figure 5 This is a schematic diagram of the mesh panel assembly and the arc-shaped railing bar of this utility model;

[0031] Figure 6 This is a front view schematic diagram of the arc-shaped fixing frame and the arc-shaped railing bar of this utility model;

[0032] Figure 7 This is a multi-view schematic diagram of the support member and support plate of this utility model;

[0033] In the diagram: 1. Mesh panel assembly; 101. Arc-shaped fixing frame; 1011. Upper arc-shaped rod; 1012. Lower arc-shaped rod; 1013. Connecting rod; 102. Arc-shaped mesh panel;

[0034] 2. Railing assembly; 201. Mounting component; 2011. Support component; 2012. Threaded hole; 2013. Limit screw; 2014. Support plate; 202. Mounting hole; 203. Railing arc bar;

[0035] 3. Connector; 4. Connecting sleeve; 5. Pin hole; 6. Limit pin. Detailed Implementation

[0036] The embodiments will be further described below with reference to the accompanying drawings.

[0037] like Figures 1-7 As shown in the preferred embodiment 1, a large mixed-flow impeller blade safety protection device is provided. The device has a ring structure and surrounds the outer periphery of the blade above the lower leak-proof ring of the impeller. The device body is assembled from several protection modules. The lower half of each protection module is a mesh plate assembly 1 and the upper half is a railing assembly 2. The bottom of the railing assembly 2 is detachably installed on the top of the mesh plate assembly 1 through the mounting part 201 and fasteners.

[0038] After modularization, the device is installed module by module, eventually assembling into a whole. The mesh panel assembly 1 and railing assembly 2 within the module can also be assembled, ensuring convenient installation and efficient maintenance. At the same time, the double-layer design increases the height of the protective module, preventing workers from falling and improving safety. Furthermore, the design of the bottom mesh panel assembly 1 can effectively intercept tools that accidentally slip during maintenance, preventing tools from falling through gaps to below the rotor blades. This reduces tool loss and wear, and also lowers the risk of mechanical damage or personal injury caused by falling tools, simultaneously improving safety and maintenance efficiency.

[0039] Preferably, the device is arranged around the rotor blades and achieves self-support through its annular shape. At the same time, the inner diameter of the annulus is controlled to be no less than the diameter of the hole through which the rotor blades pass at the top of the rotor chamber, so as to ensure effective protection of the hole and prevent workers and maintenance tools from falling.

[0040] As a preferred embodiment 2, the specific structure described above is further defined.

[0041] Each mesh panel assembly 1 includes a welded trapezoidal arc-shaped fixing frame 101. The arc-shaped fixing frame 101 is concentric and coaxial with the rotating blades, and an arc-shaped mesh panel 102 is welded and fixed to the side of the arc-shaped fixing frame 101 away from the rotating blades. The arc-shaped mesh panel 102 is in close contact with the arc-shaped fixing frame 101. This enhances the shielding effect and makes the mesh panel assembly 1 a whole, facilitating installation and use.

[0042] The arc-shaped fixing frame 101 has parallel upper arc-shaped rods 1011 and lower arc-shaped rods 1012 at its bottom and top. Several connecting rods 1013 are welded between the upper arc-shaped rods 1011 and lower arc-shaped rods 1012. The upper arc-shaped rod 1011 is fixed to the lower arc-shaped rod 1012 via the connecting rods 1013, and the upper arc-shaped rod 1011 and lower arc-shaped rod 1012 cooperate to form a trapezoidal structure. The upper arc-shaped rod 1011 and lower arc-shaped rod 1012 have the same length and the same starting position, ensuring stability after installation.

[0043] The aperture of the arc-shaped mesh plate 102 is smaller than the size of the smallest turbine blade maintenance tool. This prevents the maintenance team from falling.

[0044] The railing assembly 2 includes a plurality of mounting members 201 arranged at equal intervals along the upper arc-shaped rod 1011. Each mounting member 201 has a plurality of mounting holes 202 at equal intervals on its top. The mounting holes 202 on adjacent mounting members 201 correspond one-to-one. A single arc-shaped railing rod 203 is embedded in and welded to each corresponding mounting hole 202. The plurality of arc-shaped railing rods 203 cooperate with the mounting members 201 to form a railing. This makes the railing assembly 2 a single unit, facilitating installation and use.

[0045] The bottom of the mounting component 201 is provided with a support component 2011, which has an inverted U-shaped structure. The support component 2011 hangs upside down on the upper arc-shaped rod 1011. Both sides of the support component 2011 are provided with threaded holes 2012, and limit screws 2013 are installed in the internal threads of the threaded holes 2012. After the limit screws 2013 are tightened, they form a clamping and limiting fixation with the arc-shaped mesh plate 102. To ensure the installation of the railing assembly 2 on the mesh plate assembly 1, all the support components 2011 are inverted and fitted onto the upper arc-shaped rod 1011. After tightening the limit screws 2013, the railing assembly 2 can be fixed on the corresponding mesh plate assembly 1.

[0046] A support plate 2014 perpendicular to the top of the support member 2011 is welded and fixed to the top. The support plate 2014 has several mounting holes 202 evenly spaced along its vertical direction. The mounting holes 202 on adjacent support plates 2014 correspond one-to-one, and each corresponding mounting hole 202 is penetrated by the same curved railing rod 203. The curved railing rod 203 is welded and fixed to the corresponding mounting hole 202, and the curved railing rod 203 cooperates with the support plate 2014 to form a railing. This ensures the formation of the railing and is used to create a fence.

[0047] The centers of the corresponding mounting holes 202 are located on the same circular track. The lengths of the railing arc rods 203 of the same mesh panel assembly 1 are the same, and the starting positions of the railing arc rods 203 of the same mesh panel assembly 1 are the same. All railing arc rods 203 are parallel to the upper arc rod 1011.

[0048] The upper arc rod 1011, the lower arc rod 1012 and the railing arc rod 203 are each provided with a joint 3 and a mating sleeve 4 at both ends;

[0049] The joint 3 of the lower arc-shaped rod 1012 is sequentially embedded in the mating sleeve 4 of the adjacent lower arc-shaped rod 1012, and the lower arc-shaped rods 1012 are spliced ​​to form a ring;

[0050] The joint 3 of the upper arc rod 1011 is also sequentially embedded in the mating sleeve 4 of the adjacent upper arc rod 1011, and the upper arc rods 1011 are spliced ​​to form a ring.

[0051] The joints 3 of the curved railing bars 203 located on the same circular track are also sequentially embedded in the mating sleeves 4 of the adjacent curved railing bars 203, and the curved railing bars 203 are spliced ​​to form a ring. This ensures the overall circular installation.

[0052] Both the connector 3 and the mating sleeve 4 are provided with radial pin holes 5. When the connector 3 is embedded in the corresponding mating sleeve 4, the pin holes 5 on the connector 3 and the corresponding mating sleeve 4 overlap and are locked by passing through the limiting pin 6. This ensures the stability of the installation. After successful docking, the limiting pin 6 limits the position to prevent dislocation and failure of the guardrail enclosure, ensuring that the guardrail always remains circular.

[0053] As a preferred embodiment 3, a hard aluminum alloy is used, which is lightweight, corrosion-resistant, and high-strength, thus extending the service life of the device.

[0054] The working principle of this utility model is as follows: It innovatively adopts a split-modular design, allowing each component to be independently disassembled and flexibly combined. Standardized interfaces enable rapid assembly into a complete protective structure. The mesh panel component 1 and railing component 2 within the module employ an assembly-type design, significantly simplifying the installation and disassembly process. Furthermore, standardized components allow for rapid on-site assembly, effectively shortening the overall maintenance period. The double-layer guardrail structure design significantly increases the overall protective height, forming a three-dimensional fall barrier. This physically reduces the risk of accidental falls and significantly enhances on-site safety. The bottom mesh panel component 1 uses a mesh structure design, precisely reducing the gaps between openings to form a high-density protective interface. This effectively intercepts tools that accidentally slip during maintenance, preventing them from falling through gaps to below the impeller blades. This reduces tool loss and wear, and lowers the risk of mechanical damage or personal injury caused by falling tools, simultaneously improving safety and maintenance efficiency. The upper railing component, with its reasonable height and spacing design, further strengthens fall protection for personnel, forming a comprehensive protective system with the lower mesh panel, ensuring all-round operational safety.

Claims

1. A safety guard for the blade of a large Francis runner, comprising a ring-shaped guard body arranged around the outer periphery of the blade above the runner's lower shroud, characterized in that, The device body is assembled from several protective modules. The lower half of each protective module is a mesh panel assembly (1), and the upper half is a railing assembly (2). The bottom of the railing assembly (2) is detachably installed on the top of the mesh panel assembly (1) through the mounting part (201) and fasteners.

2. The safety protection device for large mixed-flow turbine blades according to claim 1, characterized in that, Each of the mesh plate assemblies (1) includes a trapezoidal arc-shaped fixing frame (101) welded together. The arc-shaped fixing frame (101) is coaxial with the rotor blades, and an arc-shaped mesh plate (102) is welded and fixed on the side of the arc-shaped fixing frame (101) away from the rotor blades. The arc-shaped mesh plate (102) is in close contact with the arc-shaped fixing frame (101).

3. A safety guard for a blade of a large Francis runner according to claim 2, characterized in that The bottom and top of the arc-shaped fixing frame (101) are provided with an upper arc-shaped rod (1011) and a lower arc-shaped rod (1012) that are parallel to each other. Several connecting rods (1013) are welded between the upper arc-shaped rod (1011) and the lower arc-shaped rod (1012). The upper arc-shaped rod (1011) is fixed to the lower arc-shaped rod (1012) through the connecting rods (1013). The upper arc-shaped rod (1011) and the lower arc-shaped rod (1012) cooperate to form a ladder-shaped structure through the connecting rods (1013). The upper arc-shaped rod (1011) and the lower arc-shaped rod (1012) have the same length and the starting position of the upper arc-shaped rod (1011) and the lower arc-shaped rod (1012) is the same.

4. A safety guard for a blade of a large Francis runner according to claim 3, characterized in that The aperture of the arc-shaped mesh plate (102) is smaller than the size of the smallest rotor blade maintenance tool.

5. A safety guard for a blade of a large mixed flow runner according to claim 4, characterized in that The railing assembly (2) includes a number of mounting parts (201) arranged at equal intervals along the upper arc-shaped bar (1011). The top of the mounting parts (201) is provided with a number of mounting holes (202) at equal intervals. The mounting holes (202) on adjacent mounting parts (201) correspond one to one. The same railing arc-shaped bar (203) is embedded and welded into the corresponding mounting holes (202). The railing arc-shaped bars (203) and the mounting parts (201) cooperate to form a railing.

6. A safety guard for a blade of a large mixed flow runner according to claim 5, characterized in that The bottom of the mounting component (201) is provided with a support component (2011). The support component (2011) has an inverted U-shaped structure and is hung upside down on the upper arc rod (1011). Both sides of the support component (2011) are provided with threaded holes (2012). Limit screws (2013) are installed in the threaded holes (2012). After the limit screws (2013) are tightened, they form a clamping and limiting fixation with the arc mesh plate (102).

7. A safety guard for a blade of a large Francis runner according to claim 6, characterized in that The top of the support member (2011) is welded and fixed with a support plate (2014) perpendicular to the top of the support member (2011). The support plate (2014) is provided with a plurality of mounting holes (202) evenly distributed along the vertical direction of the support plate (2014). The mounting holes (202) on adjacent support plates (2014) correspond one to one. The corresponding mounting holes (202) are penetrated by the corresponding railing arc rod (203). The railing arc rod (203) is welded and fixed to the corresponding mounting hole (202), and the railing arc rod (203) and the support plate (2014) cooperate to form a railing.

8. A safety guard for a blade of a large Francis runner according to claim 7, characterized in that The centers of the corresponding mounting holes (202) are located on the same circular track. The lengths of the railing arc bars (203) of the same mesh panel assembly (1) are the same, and the starting positions of the railing arc bars (203) of the same mesh panel assembly (1) are the same. The railing arc bars (203) are all parallel to the upper arc bar (1011).

9. A safety guard for a blade of a large Francis runner according to claim 8, characterized in that The upper arc rod (1011), the lower arc rod (1012), and the railing arc rod (203) are each provided with a joint (3) and a connecting sleeve (4) at both ends. The joint (3) of the lower arc rod (1012) is successively embedded in the mating sleeve (4) of the adjacent lower arc rod (1012), and the lower arc rod (1012) is spliced ​​to form a ring; The joint (3) of the upper arc rod (1011) is also sequentially embedded in the mating sleeve (4) of the adjacent upper arc rod (1011), and the upper arc rod (1011) is spliced ​​to form a ring; The joints (3) of the railing arc bars (203) located on the same circular track are also sequentially embedded in the connecting sleeves (4) of the adjacent railing arc bars (203), and the railing arc bars (203) are spliced ​​to form a ring.

10. A safety guard for a blade of a large mixed flow runner according to claim 9, characterized in that Both the connector (3) and the mating sleeve (4) are provided with pin holes (5) in the radial direction. When the connector (3) is embedded in the corresponding mating sleeve (4), the pin holes (5) on the connector (3) and the pin holes (5) on the corresponding mating sleeve (4) overlap and are locked by passing through the limiting pin (6).

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