A labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve

Abstract

The utility model relates to a kind of big pressure difference labyrinth bypass valve's labyrinth disc piece assembly structure.The existing labyrinth disc piece assembly assembly precision is insufficient, and pressure reduction efficiency is limited.The utility model includes the disc piece bottom ring of being set to component bottom, the disc piece top ring of top and the labyrinth disc piece assembly between the two, it is characterized in that the labyrinth disc piece assembly is made of multiple groups of stacked labyrinth disc piece, each group includes a piece of inner disc piece, a piece of interval disc piece and two pieces of outer disc piece, the outer disc piece is attached with interval disc piece, inner disc piece is located between two pieces of outer disc piece, a plurality of labyrinth flow passages that pass through up and down are equipped on the inner disc piece and outer disc piece, and the upper and lower walls of interval disc piece constitute the top wall and bottom wall of labyrinth flow passage, wherein the number of inlet channel of labyrinth flow passage is greater than the number of outlet channel.It can solve the problems of low processing efficiency, complex structure, insufficient pressure reduction and noise reduction and inconvenient assembly and maintenance of existing labyrinth disc piece assembly.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve. Background Technology

[0002] Labyrinth bypass valves, as high-pressure differential fluid regulating elements, are widely used in power generation, petrochemicals, long-distance pipelines, and other high-pressure applications. Their core function is to achieve a gradual reduction in fluid pressure through multi-stage throttling and energy consumption, thereby effectively avoiding adverse phenomena such as cavitation, vibration, and noise. In existing technologies, the labyrinth disc assembly is the key component for achieving this function; its main role is to divert, deflect, and dissipate fluid flow through the labyrinth channels on the disc.

[0003] Existing labyrinth disk assemblies typically employ multiple stacked planar disks, creating flow channels through labyrinth grooves on individual disks to achieve fluid pressure reduction. However, this type of structure has the following drawbacks: High processing difficulty: Traditional single-piece labyrinth disks require complex grooves to be machined on thin plates, which requires high process precision, has high manufacturing costs, and is prone to stress concentration leading to disk damage.

[0004] Insufficient assembly precision: The existing disc stacking structure lacks a unified positioning and fastening design, which makes it prone to misalignment under the impact of high pressure differential fluid, affecting sealing performance and fluid regulation effect.

[0005] Limited pressure reduction efficiency: Due to limitations in single-piece thickness and processing precision, energy consumption under high pressure differential conditions is insufficient, and erosion or flow-induced vibration may occur in local flow channels, reducing service life.

[0006] Maintenance difficulties: Traditional disk assemblies are complex to disassemble and assemble as a whole, and it is inconvenient to replace parts when they are damaged, which increases maintenance costs and affects operational reliability.

[0007] Therefore, there is an urgent need for a labyrinth disk assembly with a reasonable structural design, controllable processing, significant voltage reduction and energy dissipation effects, simple assembly, and easy maintenance to meet the requirements for safe, stable, and efficient operation under high pressure differential conditions. Utility Model Content

[0008] To address the problems existing in the prior art, this utility model provides a labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve, which solves the problems of low processing efficiency, complex structure, insufficient pressure reduction and noise reduction, and inconvenient assembly and maintenance of existing labyrinth disc assemblies.

[0009] This utility model adopts the following technical solution: a labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve, comprising a bottom disc ring at the bottom of the assembly, a top disc ring at the top, and a labyrinth disc assembly located between the two. The labyrinth disc assembly is characterized by being composed of multiple stacked labyrinth discs, each group comprising an inner disc, a spacer disc, and two outer discs. The outer discs are fitted to the spacer discs, and the inner disc is located between the two outer discs. The inner and outer discs are provided with multiple vertically penetrating labyrinth flow channels. The upper and lower walls of the spacer discs constitute the top and bottom walls of the labyrinth flow channels, wherein the number of inlet channels in the labyrinth flow channels is greater than the number of outlet channels. This design not only avoids the technological difficulty of machining complex grooves on a single structure but also significantly improves the overall strength and durability of the labyrinth disc assembly, reducing the risk of damage due to stress concentration, and is suitable for long-term stable operation under large differential pressure conditions. It can achieve step-by-step throttling and energy dissipation of fluid under high differential pressure conditions.

[0010] Preferably, the ratio of the number of inlet channels to the number of outlet channels is 2:1.

[0011] Preferably, the maze flow channel formed by the maze disc assembly is a multi-level, up-and-down bend maze-like channel.

[0012] Preferably, the inlet and outlet channels adopt a non-uniform cross-section layout, with a gradually decreasing or increasing cross-sectional area gradient along the levels.

[0013] Preferably, the labyrinth flow channel includes four upper and lower inlet channels and two outlet channels arranged in any radial direction along the circumference. At the end of the middle channel, two labyrinth flow channels in the same group merge and counteract each other. This allows for multiple counteracting and diversion in the middle channel, achieving the effect of progressive throttling and energy dissipation. Each group of labyrinth discs is equipped with several labyrinth flow channels with identical structures to ensure overall performance consistency and standardized manufacturing.

[0014] Preferably, the labyrinth channel within the labyrinth disc assembly is provided with several right-angle bends arranged vertically.

[0015] Preferably, the assembly also includes hexagonal head bolts and cylindrical pins, which pass through positioning holes on the bottom ring of the disc, the labyrinth disc assembly, and the top ring of the disc to secure the disc. During assembly, the cylindrical pins and hexagonal head bolts are inserted into the positioning holes to fix the disc position and ensure assembly accuracy.

[0016] Preferably, there are 10 cylindrical pins and 5 hexagonal head bolts, with a ratio of 2:1. The 5 hexagonal head bolts are evenly spaced along the circumferential direction of the labyrinth disk assembly structure, and the cylindrical pins are evenly distributed on both sides of each hexagonal head bolt.

[0017] The beneficial effects of this utility model are as follows: A large-differential-pressure labyrinth disc assembly is formed by the multi-layer bonding of outer discs, inner discs, and spacer discs, significantly improving structural strength and reducing damage. Furthermore, the use of vertically penetrating flow channel holes on the discs replaces the traditional single-piece engraved grooves, reducing processing difficulty and improving manufacturing precision. The labyrinth flow channel formed in this application is a multi-stage vertically bent channel with inlet and outlet channels, achieving multiple flushing and diversion to ensure the stability of fluid throttling and energy dissipation. The assembly is positioned using evenly distributed cylindrical pins and hexagonal bolts, ensuring assembly accuracy and operational safety. Simultaneously, the split structure facilitates disassembly and maintenance, making it suitable for long-term stable operation under high-differential-pressure conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this design.

[0019] Figure 2 This is a three-dimensional exploded structural diagram of the design.

[0020] Figure 3 This is a three-dimensional cross-sectional structural diagram of the design.

[0021] Figure 4 This is a cross-sectional structural diagram of the labyrinth disk assembly in this design.

[0022] Figure 5 This is a schematic diagram of the installation and layout of the maze disk assembly in this design structure.

[0023] Figure 6 This is a schematic diagram of the spatial flow channel layout on the maze disk of this design structure.

[0024] Figure 7 This is a schematic diagram of the layout of a single spatial flow channel in this design structure.

[0025] Figure 8 This is a three-dimensional schematic diagram of a single spatial flow channel in this design structure.

[0026] In the diagram: 1. Hexagonal head bolt 2. Disc bottom ring 3. Cylindrical pin 4. Disc top ring 5. Labyrinth disc assembly 6. Locating pin hole 7. Locating bolt hole 501. Outer disc 502. Inner disc 503. Spacer disc 504. Labyrinth flow channel 505. Upper inlet channel 506. Lower inlet channel 507. Intermediate channel 508. Upper outlet channel 509. Lower outlet channel. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments.

[0028] like Figures 1-5The diagram illustrates the structure of a labyrinth disc assembly for a high-differential-pressure labyrinth bypass valve. The assembly includes a hexagonal head bolt 1, a bottom disc ring 2, a cylindrical pin 3, a top disc ring 4, and a labyrinth disc assembly 5. The labyrinth disc assembly 5 comprises an outer disc 501, an inner disc 502, a spacer disc 503, and a labyrinth flow channel 504. Specifically, the labyrinth disc assembly 5 is composed of multiple stacked discs, each group including one inner disc 502, one spacer disc 503, and two outer discs 501, forming an "outer-inner-outer" structure. Multiple positioning pin holes 6 and positioning bolt holes 7 are provided between the discs for assembly positioning. The following is a detailed description of the implementation of this structure: The maze disc assembly 5 is fixed by a bottom ring 2 and a top ring 4. The bottom ring 2 is located at the bottom of the maze disc assembly 5, and the top ring 4 is located at its top. The assembly also includes multiple cylindrical pins 3 and hexagonal head bolts 1 for assembly positioning and fastening. The cylindrical pins 3 and hexagonal head bolts 1 are respectively inserted into the positioning pin holes 6 and positioning bolt holes 7 on each maze disc assembly 5, the bottom ring 2, and the top ring 4, in a ratio of 2:1. The five hexagonal head bolts 1 are evenly spaced along the circumference of the maze disc assembly 5, and the cylindrical pins 3 are distributed on both sides of the hexagonal head bolts 1 to ensure the stability of the assembly.

[0029] The labyrinth channel 504 of the labyrinth disc assembly 5 adopts a through-groove structure, which is convenient for processing. After precise positioning by the cylindrical pin 3, the clamping force of the hexagonal head bolt 1 presses each disc together, and there is no overflow between the discs. The stacked structure of the discs facilitates assembly and disassembly, and is conducive to timely cleaning of the sludge in the labyrinth disc assembly 5.

[0030] Specifically, the labyrinthine flow channel 504 structure is formed by the labyrinth disk assembly 5 consisting of multiple stacked disks. Each set includes an inner disk 502, a spacer disk 503, and two outer disks 501, forming an "outer-inner-outer" structure. The outer disks 501 are attached to the spacer disks 503, and the inner disks 502 are located on top of the outer disks 501. The inner disks 502 and outer disks 501 are provided with multiple vertically penetrating labyrinthine flow channel holes. The upper and lower walls of the spacer disks 503 constitute the bottom and top walls of the labyrinthine flow channel, thus forming a multi-level, vertically bent labyrinthine flow channel 504. Each set of labyrinth disk assemblies 5 is assembled to form several labyrinthine flow channels 504, and each labyrinthine flow channel 504 can pass through a certain amount of medium.

[0031] like Figures 6-7As shown, the labyrinth flow channel 504 within the labyrinth disc assembly 5 has several vertically arranged right-angle bends, increasing the resistance of the fluid medium through multiple stages of right-angle deflections. Depending on specific operating requirements, the number of bends can be precisely calculated to effectively control the flow velocity of the medium in each stage, achieving step-by-step pressure reduction. Consequently, the fluid pressure is always maintained above its saturation vaporization pressure, avoiding problems such as cavitation, localized corrosion, increased noise, and severe vibration, thereby improving the valve's operational safety and stability under high pressure differential conditions.

[0032] like Figure 8 As shown, the maze flow channel 504 includes an entrance channel, a middle channel 507, and an exit channel, with two entrance channels corresponding to one exit channel. The entrance channels include an upper entrance channel 505 and a lower entrance channel 506, and the exit channels include an upper exit channel 508 and a lower exit channel 509.

[0033] The innovation of this utility model lies in: 1. Multi-stage energy consumption and flow resistance regulation design This invention achieves a multi-stage labyrinth flow channel that runs vertically through a combination of inner and outer discs and spacer discs. This allows the medium to experience multiple reversals, turbulence, and local throttling during its passage, thereby achieving continuous energy consumption, significantly reducing the flow velocity impact caused by high pressure differential, improving valve operation stability, and avoiding cavitation and fluid noise problems.

[0034] 2. Structural strength optimization design Compared to the traditional single-piece labyrinth structure, this utility model adopts a split multi-disc combination structure. With the help of evenly distributed positioning pins and bolts, the components have higher overall rigidity and erosion resistance under high pressure differential conditions, effectively reducing the risk of fatigue damage and deformation caused by fluid pulsation and improving service life.

[0035] 3. Functional layout of maze flow channels The flow channels exist in the component in the form of 4 inlets and 2 outlets arranged in any radial direction (the labyrinth flow channels in the same group branch into 2 channels), and the flow is split and counteracted multiple times between the discs, forming a complex turbulent flow path. This design enhances the energy dissipation effect of the fluid, reduces the velocity gradient, avoids scouring damage caused by local eddies and cavitation, and improves the durability of the bypass valve under high pressure differential conditions.

[0036] 4. Staged pressure drop and flow field control By adjusting the number, diameter, and relative position of the flow channels on the disc, the pressure drop of the fluid in each flow channel is distributed according to a predetermined ratio, reducing energy concentration at a single location, reducing stress concentration and impact wear, ensuring that the bypass valve operates smoothly under high pressure differential and high flow conditions, and has a longer service life.

[0037] 5. Modularity and maintainability The disc assembly of this invention features a detachable, modular structure, facilitating quick replacement in case of localized wear and reducing maintenance costs. Simultaneously, this structure improves manufacturability while maintaining strength, making it suitable for various bypass valves and high-pressure differential control scenarios.

[0038] 6. Asymmetric flow channel splitting and differentiated inlet / outlet cross-sectional area design This invention's labyrinth disc assembly employs an asymmetric flow channel design and differentiated inlet and outlet cross-sectional areas. By achieving asymmetric arrangement of flow channel holes and differences in flow splitting angles across each stage of the discs, the fluid exhibits velocity dispersion and energy gradient reduction during the deflection process, thus lowering the risk of localized impact and cavitation. Simultaneously, in each stage of the labyrinth flow channel, the inlet and outlet channels utilize a non-uniform cross-sectional layout, and gradually decreasing or expanding cross-sectional area gradients can be set along each stage. This optimizes the distribution of flow velocity and static pressure, achieving graded pressure drop, energy dissipation, and flow field stability. It effectively reduces peak shear stress and flow-induced vibration, improving operational stability and durability under high pressure differential conditions.

[0039] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve, comprising a bottom disc ring (2) disposed at the bottom of the assembly, a top disc ring (4) disposed at the top, and a labyrinth disc assembly (5) located between the two, characterized in that... The maze disc assembly (5) consists of multiple stacked maze discs, each of which includes an inner disc (502), a spacer disc (503), and two outer discs (501). The outer discs (501) are attached to the spacer discs (503), and the inner disc (502) is located between the two outer discs (501). The inner discs (502) and the outer discs (501) are provided with multiple vertically connected maze channels (504). The upper and lower walls of the spacer discs (503) constitute the top and bottom walls of the maze channels (504). The number of inlet channels of the maze channels (504) is greater than the number of outlet channels.

2. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 1, characterized in that... The ratio of the number of entrance channels to the number of exit channels is 2:

1.

3. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 1 or 2, characterized in that... The labyrinth channel formed by the labyrinth disc assembly (5) is a multi-level labyrinthine channel (504) with up-and-down bends.

4. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 3, characterized in that... The entrance and exit channels adopt a non-uniform cross-section layout, with gradually decreasing or increasing cross-sectional area gradients along the levels.

5. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 4, characterized in that... The maze flow channel (504) includes four upper and lower inlet channels and two outlet channels arranged in any radial direction along the circumference. At the end of the middle channel, the two maze flow channels (504) in the same group merge and counteract each other.

6. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 5, characterized in that... The labyrinth channel (504) in the labyrinth disc assembly (5) is provided with several right-angle bends arranged vertically.

7. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 1, characterized in that... It also includes hexagonal head bolts and cylindrical pins, which pass through positioning holes on the cylindrical pin disc bottom ring (2), the labyrinth disc assembly and the disc top ring (4) to fix the disc.

8. The labyrinth disc assembly structure for a large differential pressure labyrinth bypass valve according to claim 7, characterized in that... There are 10 cylindrical pins (3) and 5 hexagonal head bolts (1), with a ratio of 2:

1. The 5 hexagonal head bolts (1) are evenly spaced along the circumferential direction of the labyrinth disk assembly (5) structure, and the cylindrical pins (3) are evenly distributed on both sides of each hexagonal head bolt (1).

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