A connection structure for a steam-water separator

Abstract

The utility model discloses a connecting structure for steam-water separator, include: support board, be equipped with opening on the support board, steam-water separator inlet section, steam-water separator inlet section penetrates the opening, and connecting assembly, connecting assembly is used for with steam-water separator inlet section is connected in support board, and allows steam-water separator inlet section occurs tiny displacement relative to support board.

Description

Technical Field

[0001] This utility model belongs to the technical field of steam-water separators for nuclear energy projects, and relates to a connection structure for steam-water separators. Background Technology

[0002] In the fields of nuclear energy and large-scale thermal power generation, the steam generator is a core piece of equipment, and the performance of its internal steam-water separator directly affects the thermal efficiency and operational safety of the entire unit. The steam-water separator, through its internal cyclone separation unit, efficiently separates water droplets carried in saturated steam, providing dry superheated steam to the turbine. As units develop towards larger capacity and higher parameters, more stringent requirements are placed on the operational reliability and separation efficiency of the steam-water separator, and the connection technology between it and the supporting structure is also constantly evolving.

[0003] Currently, steam-water separators are mostly connected to support plates using rigid welding or simple bolted flanges. These traditional connection methods, when dealing with the intense thermal fluctuations caused by unit start-up and shutdown and power fluctuations, are prone to generating significant thermal stress at the connection points due to differences in the thermal expansion coefficients of the materials. Over long-term use, this can lead to structural fatigue damage. Simultaneously, steam flow induces continuous high-frequency vibrations in the separator. Rigid connections not only fail to effectively dampen this vibration but may also transmit it to the entire support plate assembly, causing resonance risks and affecting equipment lifespan. Furthermore, traditional fixed connections often present challenges such as difficult disassembly and non-reusability when equipment maintenance is required, increasing maintenance costs and time.

[0004] Therefore, it is necessary to improve and optimize the connection structure of the existing steam-water separator in order to solve the outstanding problems in terms of thermal compensation, vibration resistance and maintainability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a connection structure for a steam-water separator.

[0006] To achieve the above objectives, the technical solution of this utility model is: a connection structure for a steam-water separator, comprising: a support plate having an opening; a steam-water separator inlet section passing through the opening; and a connection assembly for connecting the steam-water separator inlet section to the support plate and allowing the steam-water separator inlet section to undergo slight displacement relative to the support plate.

[0007] The connecting assembly includes a spherical sealing seat disposed at the opening of the support plate, a spherical flange fixed to the inlet section of the gas-water separator, and a metal sealing gasket disposed between the spherical sealing seat and the spherical flange; the back of the spherical flange is provided with an annular pressing boss; it also includes a pressure plate and fasteners, the pressure plate being pressed against the pressing boss by the fasteners.

[0008] The fastener is a bolt and a disc spring assembly. The bolt passes through the disc spring assembly and the pressure plate and is threadedly connected to the support plate.

[0009] A radial clearance is formed between the through hole on the pressure plate and the shank of the bolt, the radial clearance being configured to allow the pressure plate to self-level during clamping.

[0010] It also includes a sleeve welded to the lower surface of the support plate and fitted outside the inlet section of the steam-water separator, wherein the inlet section of the steam-water separator is connected to the lower end of the sleeve via a flexible metal plate.

[0011] The flexible metal plate is annular, with its inner ring welded to the outer wall of the inlet section of the steam-water separator and its outer ring welded to the lower end of the sleeve; the flexible metal plate has multiple arc-shaped grooves, which are distributed circumferentially around the center of the flexible metal plate.

[0012] The arc-shaped groove extends outward from the inner ring edge of the flexible metal plate, or inward from its outer ring edge, or from its middle part to both the inner and outer sides.

[0013] By adopting the above technical solution, the beneficial effects of this utility model are: By combining the spherical sealing pair with the elastic clamping mechanism, the structural displacement caused by thermal expansion and contraction can be effectively absorbed, and the thermal stress of the connection part can be significantly reduced. This solves the problem that traditional rigid connections are prone to fatigue damage under thermal alternation conditions, and improves the safety and service life of the equipment under start-up, shutdown and variable load operation conditions. By setting a flexible support component with an arc groove at the bottom, not only is a stable auxiliary support provided for the steam-water separator, but its own elastic deformation can also dampen and consume the energy of flow-induced vibration, effectively suppressing the harmful shaking of the separator body and its vibration transmission to the support structure, thus solving the risk of poor vibration resistance and easy resonance caused by traditional connection methods. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is the utility model Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the connection structure of the support plate, sleeve, flexible metal plate and the inlet section of the steam-water separator of this utility model; Figure 4 This is a partial schematic diagram of the connection structure between the inlet section and the spherical flange of the gas-water separator of this utility model.

[0015] In the figure, 1 is the support plate; 101 is the spherical sealing seat; 2 is the inlet section of the steam-water separator; 3 is the spherical flange; 301 is the clamping boss; 4 is the metal sealing gasket; 5 is the pressure plate; 6 is the bolt; 7 is the disc spring assembly; 8 is the sleeve; 9 is the flexible metal plate; and 901 is the arc groove. Detailed Implementation

[0016] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0017] like Figures 1 to 4 As shown, this utility model provides a connection structure for a steam-water separator.

[0018] To effectively release thermal stress and ensure reliable sealing while fixing the steam-water separator to the support plate, the specific structure of this utility model is as follows: It includes a support plate 1 with an opening; a steam-water separator inlet section 2 passing through the opening; and a connecting assembly for connecting the steam-water separator inlet section 2 to the support plate 1, allowing for slight displacement of the inlet section 2 relative to the support plate 1. Through this structure, when the steam-water separator undergoes thermal expansion due to temperature changes, the connection between its inlet section and the support plate 1 is no longer a rigid constraint. This fundamentally avoids the problem of huge internal stress caused by thermal expansion differences in traditional rigid connections, significantly improving the safety and service life of the equipment under start-up, shutdown, and variable load operating conditions.

[0019] To achieve reliable sealing and allow for angular deflection, the connection assembly includes a spherical sealing seat 101 located at the opening of the support plate 1, a spherical flange 3 fixed to the inlet section 2 of the steam-water separator, and a metal sealing gasket 4 positioned between the spherical sealing seat 101 and the spherical flange 3. The spherical flange 3 has an annular clamping boss 301 on its back; it also includes a pressure plate 5 and fasteners, with the pressure plate 5 pressed against the clamping boss 301 by the fasteners. When the inlet section 2 of the steam-water separator needs to deflect slightly relative to the support plate 1 due to uneven heating or installation misalignment, the spherical flange 3 can rotate within the spherical sealing seat 101. Through this structure, the metal sealing gasket 4 maintains tight contact under clamping force, ensuring absolute sealing reliability. Simultaneously, the self-aligning capability of the spherical pair solves the problem of easy leakage in traditional flat flange connections under deflection conditions.

[0020] To achieve and maintain a stable and reliable bolt preload to withstand long-term vibration and ensure a durable seal, the fasteners are bolt 6 and disc spring assembly 7. Bolt 6 passes through disc spring assembly 7 and pressure plate 5 and is threadedly connected to support plate 1. When bolt 6 is tightened, disc spring assembly 7 is compressed, and the elastic force it provides acts continuously on the clamping boss 301 of spherical flange 3 through pressure plate 5. Through this structure, disc spring assembly 7 can compensate for the thermal expansion difference between bolt 6 and support plate 1 caused by material differences at high temperatures, and can effectively prevent bolt 6 from loosening due to high-frequency vibration generated during long-term equipment operation, thus solving the risk of easy preload decay in traditional rigid bolt connections.

[0021] To ensure that the clamping force is evenly distributed on the annular clamping boss 301 of the spherical flange 3, and to avoid additional bending moments caused by uneven installation of the pressure plate 5, a radial gap is formed between the through hole on the pressure plate 5 and the shank of the bolt 6. When the pressure plate 5 is installed and the bolt 6 is tightened, the pressure plate 5 can float slightly due to this radial gap. Through the above structure, the pressure plate 5 can automatically adjust its posture so that its lower surface makes uniform contact with the upper surface of the annular clamping boss 301 over a full area, thereby ensuring that the clamping force is transmitted vertically and evenly, and avoiding sealing failure or component damage caused by excessive local stress.

[0022] To provide stable auxiliary support for the lower part of the steam-water separator inlet section 2 and effectively suppress its flow-induced vibration, a sleeve 8 is also included, welded to the lower surface of the support plate 1 and fitted over the steam-water separator inlet section 2. The steam-water separator inlet section 2 is connected to the lower end of the sleeve 8 via a flexible metal plate 9. The flexible metal plate 9 is annular, with its inner ring welded to the outer wall of the steam-water separator inlet section 2 and its outer ring welded to the lower end of the sleeve 8. This fully welded structure provides a robust lower support point for the steam-water separator inlet section 2, enhancing its overall stability. When the steam-water separator inlet section 2 vibrates, this structure can effectively suppress its amplitude and confine the vibration energy locally, solving the problems of poor overall integrity and easy vibration transmission inherent in traditional support methods.

[0023] To ensure the lower support provides stable support while also possessing multi-directional displacement compensation capabilities to further optimize vibration resistance and release thermal stress, multiple arc-shaped grooves 901 are formed on the flexible metal plate 9. These grooves 901 are distributed circumferentially around the center of the flexible metal plate 9. The arc-shaped grooves 901 extend outward from the inner ring edge of the flexible metal plate 9, or inward from its outer ring edge, or from its center outward to both the inner and outer sides. When the inlet section 2 of the steam-water separator experiences radial, axial, or angular displacement due to thermal expansion or fluid disturbance, the petal-shaped areas formed by the arc-shaped grooves 901 on the flexible metal plate 9 undergo elastic bending deformation. Through this structure, the flexible metal plate 9 can absorb displacement and vibration energy in all directions. The smooth transition design at the ends of the arc-shaped grooves 901 effectively avoids stress concentration phenomena that easily occur at the ends of straight grooves, thereby greatly improving the fatigue life of the support structure under long-term alternating loads.

[0024] The core working principle of this invention lies in the combination of rigidity and flexibility. The upper spherical sealing pair, combined with an elastic clamping mechanism, primarily addresses the issues of sealing reliability and thermal stress release. The fit between the spherical flange 3 and the spherical sealing seat 101 allows for angular displacement, while the disc spring assembly 7 ensures the stability of the sealing clamping force under vibration and temperature variations. The lower flexible metal plate 9 support primarily addresses vibration suppression and multi-directional displacement compensation. Through the elastic deformation of the flexible metal plate 9 and its arc-shaped groove 901, it provides the necessary support rigidity for the inlet section 2 of the steam-water separator, effectively damping and absorbing the vibration energy induced by its flow, and compensating for its thermal displacement. The coordinated operation of the upper and lower parts ensures that the steam-water separator can operate stably and reliably for a long time under harsh conditions of high temperature, high pressure, and strong vibration.

[0025] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0026] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A connection structure for a steam-water separator, characterized in that, include: Support plate (1), on which an opening is provided; steam-water separator inlet section (2), through which the steam-water separator inlet section (2) passes; And a connecting assembly for connecting the steam-water separator inlet section (2) to the support plate (1) and allowing the steam-water separator inlet section (2) to undergo slight displacement relative to the support plate (1).

2. The connection structure for a steam-water separator according to claim 1, characterized in that, The connecting assembly includes a spherical sealing seat (101) disposed at the opening of the support plate (1), a spherical flange (3) fixed on the inlet section (2) of the steam-water separator, and a metal sealing gasket (4) disposed between the spherical sealing seat (101) and the spherical flange (3); an annular pressing boss (301) is provided on the back of the spherical flange (3); it also includes a pressure plate (5) and fasteners, the pressure plate (5) being pressed onto the pressing boss (301) by the fasteners.

3. The connection structure for a steam-water separator according to claim 2, characterized in that, The fasteners are a bolt (6) and a disc spring assembly (7), the bolt (6) passing through the disc spring assembly (7) and the pressure plate (5) and then threadedly connected to the support plate (1).

4. The connection structure for a steam-water separator according to claim 3, characterized in that, A radial gap is formed between the through hole on the pressure plate (5) and the shank of the bolt (6), the radial gap being configured to allow the pressure plate (5) to self-level during clamping.

5. A connection structure for a steam-water separator according to claim 1, characterized in that, It also includes a sleeve (8) welded to the lower surface of the support plate (1) and sleeved outside the inlet section (2) of the steam-water separator, wherein the inlet section (2) of the steam-water separator is connected to the lower end of the sleeve (8) through a flexible metal plate (9).

6. A connection structure for a steam-water separator according to claim 5, characterized in that, The flexible metal plate (9) is annular, with its inner ring welded to the outer wall of the inlet section (2) of the steam-water separator and its outer ring welded to the lower end of the sleeve (8); the flexible metal plate (9) is provided with a plurality of arc grooves (901), which are distributed around the center of the flexible metal plate (9).

7. A connection structure for a steam-water separator according to claim 6, characterized in that, The arc-shaped groove (901) extends outward from the inner ring edge of the flexible metal plate (9), or extends inward from its outer ring edge, or extends from its middle part to both the inner and outer sides.

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