Steam turbine nozzle ring

Abstract

The utility model discloses a steam turbine nozzle ring, and relates to the technical field of steam turbine design. The steam turbine nozzle ring comprises a rotor and a stator. The blade fixing assembly comprises a fixing flange, an inclined fixing block groove is formed in the surface of the rotor, a blade fixing block is slidably connected to the inner wall of the fixing block groove, turbine blades are fixedly connected to the surface of the blade fixing block, and an inclined limiting block is fixedly connected to the lower end of the fixing flange; the cross sections of the fixing block groove, the limiting block and the blade fixing block are T-shaped; the sections of the multiple steam turbine blades are in a water drop shape, stable installation of the steam turbine blades is jointly guaranteed through the fixing flanges, the fixing block grooves, the limiting blocks and the blade fixing blocks, and efficient conversion from steam heat energy to mechanical energy is jointly completed through the nozzles and the steam turbine blades. The cooperative work of the parts ensures the normal operation and high-efficiency performance of the steam turbine.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine design technical field especially relates to a steam turbine nozzle ring. BACKGROUND

[0002] The rapid development of clean energy technology (such as gas turbine, solar thermal power system) is driven by the "double carbon" strategic goal of China, and higher requirements are put forward for the thermal efficiency of steam turbine. As the core aerodynamic component, the blade shape optimization of nozzle ring directly determines the energy conversion efficiency of working medium, and needs to match the performance requirements under high temperature and high pressure working conditions through fine design.

[0003] The key aerodynamic component of traditional high-end imported steam turbine (such as nuclear power steam turbine, ultra-supercritical thermal power unit) - nozzle ring blade shape has long relied on import, resulting in high equipment procurement cost, long supply cycle, and significant risk in supply chain due to the influence of international political and economic situation. The design of traditional steam turbine nozzle ring blade shape is based on foreign material system and process standard, and there is a significant mismatch between the related design parameters and the characteristics of domestic materials and manufacturing process, which easily affects the efficiency of steam turbine. Therefore, a new solution is proposed in the utility model. UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art, and provides a steam turbine nozzle ring, which can solve the problem that the nozzle ring blade shape has long relied on import, resulting in high equipment procurement cost, long supply cycle, and significant risk in supply chain due to the influence of international political and economic situation. The design of traditional steam turbine nozzle ring blade shape is based on foreign material system and process standard, and there is a significant mismatch between the related design parameters and the characteristics of domestic materials and manufacturing process, which easily affects the efficiency of steam turbine.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a steam turbine nozzle ring, comprising a rotor and a stator;

[0006] The blade fixing assembly is arranged on the surface of the rotor, and the blade fixing assembly comprises a fixing flange, which is installed on the upper end of the rotor;

[0007] The surface of the rotor is provided with a fixing block groove in an inclined shape, the inner wall of the fixing block groove is slidably connected with a blade fixing block, the surface of the blade fixing block is fixedly connected with a steam turbine blade, and the lower end of the fixing flange is fixedly connected with a limiting block in an inclined shape;

[0008] The number of steam turbine blades, fixing block grooves, limiting blocks and blade fixing blocks is multiple, and they are arranged in an annular array on the side surface of the rotor respectively;

[0009] The cross section of the fixing block groove, the limiting block and the blade fixing block is in the shape of "T";

[0010] The cross sections of the plurality of turbine blades are all in the shape of water droplets.

[0011] Preferably, a fourth bolt hole is arranged on the surface of the fixing flange, a third screw hole is arranged on the surface of the rotor, and a fixing bolt is threadedly connected in the third screw hole and the fourth bolt hole.

[0012] The third screw hole, the fourth bolt hole and the fixing bolt in the third screw hole and the fourth bolt hole are all provided in plurality.

[0013] Preferably, the axial directions of the plurality of turbine blades are all in an acute angle with the tangential direction of the outer side of the rotor, and a steam passage is arranged on the inner side of the stator.

[0014] A plurality of nozzles are arranged in the stator, and the extension line of the gas outlet of the nozzle points to the surface of the turbine blade.

[0015] Preferably, the upper end of the nozzle is in the shape of a funnel, and the lower end of the nozzle is in the shape of a curve and gradually decreases in diameter.

[0016] Preferably, a plurality of first bolt holes are arranged on the surface of the rotor.

[0017] Preferably, a second bolt hole is arranged on the surface of the stator.

[0018] Compared with the prior art, the turbine nozzle ring has the following beneficial effects:

[0019] 1. The turbine nozzle ring, the fixing flange, the fixing block groove, the limiting block and the blade fixing block jointly guarantee the stable installation of the turbine blade, the nozzle and the turbine blade jointly complete the high-efficiency conversion of steam heat energy into mechanical energy, and the cooperative work of these components ensures the normal operation and high-efficiency performance of the turbine. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further explained in connection with the drawings and embodiments:

[0021] Figure 1 It is a turbine nozzle ring structure schematic view of the utility model;

[0022] Figure 2 It is a stator schematic view of the utility model;

[0023] Figure 3 It is a rotor schematic view of the utility model;

[0024] Figure 4 It is a fixing flange schematic view of the utility model;

[0025] Figure 5 It is a fixing block groove schematic view of the utility model;

[0026] Figure 6 is a schematic view of a first bolt hole of the utility model;

[0027] Figure 7 is a schematic view of a limiting block of the utility model;

[0028] Figure 8 is a schematic view of a nozzle of the utility model;

[0029] Figure 9 is a schematic view of a steam turbine blade of the utility model.

[0030] Reference signs: 1, rotor; 2, stator; 3, nozzle; 4, steam turbine blade; 5, steam passage; 6, first bolt hole; 7, second bolt hole; 8, fixed flange; 9, third screw hole; 10, fourth bolt hole; 11, fixed block groove; 12, limiting block; 13, blade fixed block. DETAILED DESCRIPTION

[0031] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0032] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0033] In the description of the utility model, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described to the first, the second, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0034] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0035] Please refer to Figures 1-9The utility model provides a technical scheme: a steam turbine nozzle ring, including rotor 1 and stator 2, blade fixed assembly, blade fixed assembly sets up in the surface of rotor 1, and blade fixed assembly includes fixed flange 8, and fixed flange 8 is installed in the upper end of rotor 1, and the surface of rotor 1 is provided with the fixed block recess 11 in the shape of inclination, and the inner wall of fixed block recess 11 is slidably connected with blade fixed block 13, and the surface of blade fixed block 13 is fixedly connected with steam turbine blade 4, and the lower end of fixed flange 8 is fixedly connected with the limiting block 12 in the shape of inclination, and the number of steam turbine blade 4, fixed block recess 11, limiting block 12 and blade fixed block 13 all are multiple and are arranged in the side of rotor 1 in the shape of annular array respectively, and the section of fixed block recess 11, limiting block 12 and blade fixed block 13 all are in the shape of T, and the section of multiple steam turbine blade 4 all are in the shape of water drop.

[0036] The surface of fixed flange 8 is provided with fourth bolt hole 10, and the surface of rotor 1 is provided with third screw hole 9, and the inside of third screw hole 9 and fourth bolt hole 10 is threadedly connected with fixed bolt, and the number of third screw hole 9, fourth bolt hole 10 and the fixed bolt in the inside thereof all are multiple, and rotor 1 and fixed flange 8 are fixed through multiple fixed bolts.

[0037] The axis direction of multiple steam turbine blade 4 all forms acute angle with the tangent direction of the outside of rotor 1, and the inside of stator 2 is provided with steam passage 5, and multiple nozzles 3 are installed in the inside of stator 2, and the extension line of the gas outlet end of nozzle 3 points to the surface of steam turbine blade 4.

[0038] The upper end of nozzle 3 is in the shape of funnel, and the lower end of nozzle 3 is curved and gradually reduces in diameter.

[0039] The surface of rotor 1 is provided with multiple first bolt holes 6.

[0040] The surface of stator 2 is provided with second bolt hole 7.

[0041] When using the device, steam enters the steam passage 5 in the inside of stator 2 from the outside, because of the special structure of nozzle 3, namely the upper end is in the shape of funnel, and the lower end is curved and gradually reduces in diameter, steam is guided and converged at the upper end in the shape of funnel when flowing through nozzle 3, and then gradually accelerates at the lower end which is curved and gradually reduces in diameter, this process utilizes the special geometric shape of nozzle, so that the flow of steam in the inside continuously accelerates, and finally is sprayed out from the gas outlet end of nozzle 3 at high speed.

[0042] A plurality of turbine blades 4 are installed on the surface of the rotor 1 through a blade fixing assembly; in the blade fixing assembly, a fixing flange 8 is installed on the upper end of the rotor 1, the fixing block groove 11 on the surface of the rotor 1 is in an inclined shape, the inner wall of which is in sliding connection with the blade fixing block 13, the blade fixing block 13 is in fixed connection with the turbine blade 4, and the limiting block 12 at the lower end of the fixing flange 8 is also in an inclined shape, which plays a role in limiting the position of the blade fixing block 13; these components are arranged in an annular array on the side surface of the rotor 1, and the cross section is in a “T” shape, and the cross section of the plurality of turbine blades 4 is in a water droplet shape, which helps to optimize the aerodynamic performance of the blade while ensuring the strength of the blade.

[0043] The water droplet-shaped turbine blade 4 profile design can significantly reduce the aerodynamic resistance of steam flowing through, and the water droplet-shaped blade helps to make the pressure distribution of the steam on the blade surface more uniform; when the steam impacts the blade, the special shape of the water droplet-shaped blade can guide the steam to be evenly distributed on the blade surface, preventing the occurrence of local high or low pressure areas, ensuring the uniformity of the steam force acting on the blade, making the operation of the turbine more stable, and reducing the vibration problems caused by uneven airflow.

[0044] During the operation of the turbine, the turbine blade 4 will bear steam impact force, centrifugal force and other complex loads, and the water droplet-shaped blade structure has good natural frequency characteristics, which can effectively resist the vibration caused by steam impact and rotor rotation; within the resonance frequency range, the water droplet-shaped blade is not prone to strong resonance phenomenon, reducing the blade damage caused by vibration and ensuring the stable working state of the blade in the complex operating environment.

[0045] Due to the special shape of the water droplet-shaped turbine blade 4 and the cooperation with the nozzle 3, when high-speed steam is ejected from the nozzle 3 and impacts on the water droplet-shaped blade, the blade can more effectively convert the kinetic energy of the steam into mechanical energy of the rotor 1, and the water droplet-shaped blade can better adapt to the flow characteristics of the steam and fully utilize the energy of the steam.

[0046] The fixing flange 8 is installed on the upper end of the rotor 1, and is fixed on the rotor 1 through the cooperation of the fourth bolt hole 10 on the surface thereof and the third screw hole 9 on the surface of the rotor 1 by using a plurality of fixing bolts; this not only provides a stable installation foundation for the entire blade fixing assembly, but also enhances the overall structure.

[0047] The inclined fixed block groove 11 opened on the surface of the rotor 1 provides an accurate installation track for the blade fixed block 13; the blade fixed block 13 can slide along the inner wall of the fixed block groove 11, and this sliding connection mode not only facilitates the installation and disassembly of the blade, but also ensures the positional accuracy of the blade during operation; at the same time, the inclined design of the fixed block groove 11 helps to disperse the force generated when the steam impacts the blade, so that the force can be more evenly transmitted to the rotor 1.

[0048] The inclined limiting block 12 fixedly connected at the lower end of the fixed flange 8 cooperates with the fixed block groove 11 and the blade fixed block 13 to play a key role in limiting the position of the blade fixed block 13; during the operation of the steam turbine, the steam impacting the blade will generate complex forces, which may cause the blade fixed block 13 to displace; the limiting block 12 can effectively prevent the blade fixed block 13 from moving in the radial and circumferential directions, ensuring that the blade fixed block 13 always remains in the correct position, thereby ensuring the stability of the steam turbine blade 4.

[0049] The blade fixed block 13 is a key component connecting the steam turbine blade 4 and the rotor 1; its surface is fixedly connected with the steam turbine blade 4, and the bottom is slidingly connected with the fixed block groove 11; through this connection mode, the blade fixed block 13 firmly fixes the steam turbine blade 4 on the rotor 1, so that the force generated by the blade under the impact of steam can be smoothly transmitted to the rotor 1, realizing the effective transmission of mechanical energy; at the same time, the cooperation of the blade fixed block 13 with the fixed block groove 11 and the limiting block 12 further enhances the stability and reliability of the blade.

[0050] The steam ejected at high speed impacts on the steam turbine blade 4; since the axial directions of the plurality of steam turbine blades 4 are all at an acute angle with the tangential direction of the outer side of the rotor 1, and the extension line of the gas outlet end of the nozzle 3 points to the surface of the steam turbine blade 4, the impact force of the steam will generate a tangential component on the blade; this tangential component acts on the steam turbine blade 4, driving the rotor 1 to rotate around its axis; during the rotation of the rotor 1, the conversion of steam heat energy into mechanical energy is realized, thereby providing power output for the steam turbine to drive the entire steam turbine equipment to operate.

[0051] The shape and position design of the nozzle 3 and the steam turbine blade 4 are matched with each other; the extension line of the gas outlet end of the nozzle 3 points to the surface of the steam turbine blade 4, ensuring that the steam can accurately impact on the blade, improving the efficiency of energy conversion; at the same time, the plurality of nozzles 3 and the steam turbine blades 4 are arranged in a ring array, so that the steam can uniformly act on the blade, so that the steam can continuously accelerate when flowing through the nozzle 3, and finally be ejected at high speed; such high-speed ejected steam has strong impact force, providing a power basis for energy conversion and further improving the stability and reliability of energy conversion.

[0052] The first bolt hole 6 on the surface of the rotor 1 and the second bolt hole 7 on the surface of the stator 2, and the fourth bolt hole 10 on the surface of the fixing flange 8 and the third screw hole 9 on the surface of the rotor 1, the arrangement of these bolt holes is mainly used for stable connection and fixation of each part, to ensure that each part can maintain a relatively stable positional relationship during high-speed operation of the steam turbine, prevent parts from loosening due to vibration or other external factors, and thus ensure normal operation of the steam turbine nozzle ring and overall stability of the equipment.

[0053] Further, the fixing flange 8, the fixing block groove 11, the limiting block 12 and the blade fixing block 13 jointly ensure stable installation of the steam turbine blade 4, and the nozzle 3 and the steam turbine blade 4 jointly complete efficient conversion of steam heat energy into mechanical energy, and the cooperative work of these parts ensures normal operation and high efficiency of the steam turbine.

[0054] The welding of the device is a spot welding process:

[0055] Content

[0056] 1. Pay attention to clean the oil stains and other dirt on the welding site and nearby before welding;

[0057] 2. Use GTAW welding;

[0058] 2.1 When the material combination of the parts to be welded is carbon steel + carbon steel, the welding wire is selected to be ER70S-3;

[0059] 2.2 When the material combination of the parts to be welded is carbon steel + alloy steel or alloy steel + alloy steel, the welding wire is selected to be ERNiCr-3;

[0060] 2.3 The welder should have corresponding qualifications.

[0061] Structure description: Rotor 1: as the core rotating part, the structure on its surface is used for installing the steam turbine blade 4, and is connected and fixed with other parts through the first bolt hole 6 and the third screw hole 9, and rotates around the shaft under the action of the tangential component force generated by the steam impacting the blade, to output mechanical energy;

[0062] Stator 2: the steam flow passage 5 on the inner side provides a flow path for steam, and is fixed with other parts through the second bolt hole 7 to ensure the stability of the overall structure;

[0063] Fixing flange 8: installed on the upper end of the rotor 1, connected with the rotor 1 through the fourth bolt hole 10 and fixing bolts, to provide a stable installation basis for the blade fixing assembly and enhance the overall structure;

[0064] Fixing block groove 11: opened on the surface of the rotor 1, in an inclined shape, to provide an installation track for the blade fixing block 13, facilitate blade installation and removal, ensure accurate blade position during operation, and also disperse the steam impact force to make the force uniformly transmitted to the rotor 1;

[0065] Limiting block 12: fixed at the lower end of the fixed flange 8 and in an inclined shape, cooperating with the fixed block groove 11 and the blade fixing block 13, preventing the blade fixing block 13 from moving in the radial and circumferential directions, and ensuring the stability of the turbine blade 4;

[0066] Blade fixing block 13: connecting the turbine blade 4 and the rotor 1, fixing the blade 4 on the rotor 1, transmitting the force generated by the steam impacting the blade to the rotor 1, realizing mechanical energy transmission, and cooperating with other components to enhance the stability of the blade;

[0067] Turbine blade 4: under the impact of steam, it generates a tangential force to drive the rotor 1 to rotate, converting steam kinetic energy into rotor mechanical energy, realizing energy conversion, and the water droplet-shaped cross section optimizes the aerodynamic performance;

[0068] Nozzle 3: its special funnel-shaped upper end and curved tapered lower end structure guide and converge the steam and accelerate it to high speed to impact the blade 4, providing power for energy conversion;

[0069] Bolt hole and bolt: the first bolt hole 6 and the third bolt hole 9 of the rotor 1, the second bolt hole 7 of the stator 2, and the fourth bolt hole 10 of the fixed flange 8 cooperate with the bolt to connect and fix each component, prevent the components from loosening due to external forces such as vibration during high-speed operation of the turbine, and ensure stable operation of the equipment.

[0070] The above describes the embodiments of the utility model in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled persons in the technical field without departing from the purpose of the utility model.

Claims

1. A steam turbine nozzle ring characterized by: The turbine rotor (1) and the stator (2) are included. The blade fixing assembly is arranged on the surface of the rotor (1), and the blade fixing assembly comprises a fixing flange (8) mounted on the upper end of the rotor (1). The surface of the rotor (1) is provided with an inclined fixing block groove (11), the inner wall of the fixing block groove (11) is slidably connected with a blade fixing block (13), the surface of the blade fixing block (13) is fixedly connected with a steam turbine blade (4), and the lower end of the fixing flange (8) is fixedly connected with an inclined limiting block (12). The number of the steam turbine blades (4), the fixing block grooves (11), the limiting blocks (12) and the blade fixing blocks (13) are all multiple and arranged in a ring array on the side surface of the rotor (1). The cross sections of the fixing block grooves (11), the limiting blocks (12) and the blade fixing blocks (13) are all in a "T" shape. The cross sections of the multiple steam turbine blades (4) are all in a water drop shape.

2. A turbine nozzle ring according to claim 1, characterized in that: The surface of the fixing flange (8) is provided with a fourth bolt hole (10), the surface of the rotor (1) is provided with a third screw hole (9), and the third screw hole (9) and the fourth bolt hole (10) are internally threadedly connected with a fixing bolt. The number of the third screw holes (9), the fourth bolt holes (10) and the fixing bolts inside the third screw holes (9) and the fourth bolt holes (10) are all multiple, and the rotor (1) and the fixing flange (8) are fixed by the multiple fixing bolts.

3. A turbine nozzle ring as claimed in claim 1, characterized in that: The axial directions of the multiple steam turbine blades (4) are all at an acute angle with the tangential direction of the outer side of the rotor (1), and the inner side of the stator (2) is provided with a steam flow passage (5). The inside of the stator (2) is mounted with multiple nozzles (3), and the extension line of the gas outlet end of the nozzle (3) points to the surface of the steam turbine blade (4).

4. A turbine nozzle ring as claimed in claim 1, characterized in that: The upper end of the nozzle (3) is in a funnel shape, the lower end of the nozzle (3) is in a curved shape and gradually decreases in diameter.

5. A turbine nozzle ring as claimed in claim 1, characterized by: The surface of the rotor (1) is provided with multiple first bolt holes (6).

6. A turbine nozzle ring as claimed in claim 1, characterized by: The surface of the stator (2) is provided with a second bolt hole (7).

Images