A space stream labyrinth disc for a multi-stage pressure reducing regulating valve

Abstract

This invention relates to a spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve, wherein multiple flow channels are respectively formed on disc A and disc B; discs A are stacked together in pairs, one facing forward and one backward, to form AA. T Disk set, AA T The flow channels at corresponding positions in the platter set overlap to form the first spatial flow channel; B-plate platters are stacked in pairs, one upright and one reversed, to form BB. T Disc set, BB T In the disk assembly, corresponding flow channels overlap to form a second spatial flow channel; the first and second spatial flow channels are not interconnected, and several sets of AA T Disk sets and several BB sets T The disk assemblies are arranged alternately along the axial direction to form AA T BB T The invention relates to a streamlined labyrinth disk. The labyrinth disk described in this invention has a simple structure and is easy to manufacture. It makes full use of the space of the labyrinth disk, increases the number of voltage reduction stages within a limited space, and the streamlined labyrinth disk structure has good mechanical properties and flow capacity.

Description

Technical Field

[0001] This invention relates to the field of multi-stage pressure reducing regulating valve technology, and more particularly to a spatial streamline labyrinth disc for a multi-stage pressure reducing regulating valve. Background Technology

[0002] In modern industrial production, control valves are devices used to control the flow rate of fluids in pipelines. They are terminal control elements in piping systems, playing crucial roles in distributing fluid media, regulating flow rate, and throttling and stabilizing pressure. In recent years, with the continuous advancement of industrial technology, special operating conditions such as high temperature and high pressure in actual production have placed higher demands on control valves. Especially for control valves used in high pressure differential applications, due to the high flow velocity, erosion and corrosion often occur in the internal throttling components. This is accompanied by hazards such as cavitation, noise, and vibration caused by cavitation phenomena, posing significant risks to safe production. To address this, a labyrinthine flow channel throttling element specifically designed for multi-stage pressure-reducing control valves under high pressure differential conditions has been developed. The multi-stage pressure-reducing control valve is a throttling element used in various high-parameter operating conditions such as high temperature, high pressure differential, and ultra-large flow rates. Within a limited valve body space, it can gradually reduce the pressure of the fluid inside the valve by repeatedly changing the flow direction of the fluid flowing into the valve. This significantly improves the vibration, erosion, and noise problems that may occur within the control valve under high pressure differential conditions, and therefore it is widely used in aerospace, nuclear power, and hydropower industries.

[0003] Currently, most labyrinth-type control valves employ a planar multi-layer slotted structure (CCI). For example, Chinese patent application CN108679298A discloses a "labyrinth disc for a labyrinth-type control valve," in which the labyrinth disc has at least one labyrinthine channel. This channel includes an interconnected inlet section, an intermediate section, and an outlet section. The inlet section, located at the entrance of the labyrinthine channel, includes multiple parallel flow channels; the outlet section, located at the exit of the labyrinthine channel, also includes multiple parallel flow channels; and the intermediate section, located between the inlet and outlet sections, includes multiple bends, forming a multi-stage pressure reduction structure. The flow channel structure on this type of labyrinth disc is complex and difficult to manufacture; excessively large pressure reduction stages and a thin labyrinth disc structure lead to decreased safety; while reducing the cross-sectional area of ​​the flow channels results in an overall decrease in the valve's flow capacity. Summary of the Invention

[0004] This invention provides a spatial streamline labyrinth disc for a multi-stage pressure reducing regulating valve, employing an AA-shaped structure formed by combining an A-plate disc and a B-plate disc. T BB T The streamlined labyrinth disk has a simple structure and is easy to manufacture. It makes full use of the space of the labyrinth disk, increases the number of step-down stages in a limited space, and has good mechanical properties and flow capacity.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A spatial streamline labyrinth disc for a multi-stage pressure reducing regulating valve includes an A-plate disc and a B-plate disc. The A-plate disc has multiple flow channels, which are not interconnected. The B-plate disc also has multiple flow channels, which are not interconnected. Two A-plate discs are stacked together, one facing forward and one backward, to form an AA-plate. T Disk set, AA T The flow channels at corresponding positions in the platter set overlap to form the first spatial flow channel; B-plate platters are stacked in pairs, one upright and one reversed, to form BB. T Disc set, BB T In the disk group, the flow channels at corresponding positions overlap to form a second spatial flow channel; the flow channels on disk A and disk B are staggered, meaning the first and second spatial flow channels are not connected; the contact surfaces between two disks in the same group, and the contact surfaces between adjacent disks A and B, serve as the walls of each other's flow channels; several groups of AA T Disk sets and several BB sets T The disk assemblies are arranged alternately along the axial direction to form AA T BB T A spatial streamlined labyrinth disc.

[0007] Furthermore, the flow channels on the A-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two A-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the A-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the A-plate disk is an open structure.

[0008] Furthermore, two positioning holes are symmetrically arranged on the A-plate disk. With the line connecting the centers of the two positioning holes as the axis of symmetry, four four-bend flow channels and four two-bend flow channels are arranged in each 180° circle on both sides.

[0009] Furthermore, the four-bend flow channels and two-bend flow channels on the A-plate disk are all through-slot structures.

[0010] Furthermore, the flow channels on the B-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two B-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the B-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the B-plate disk is an open structure.

[0011] Furthermore, two positioning holes are symmetrically arranged on the B-plate disk. With the line connecting the centers of the two positioning holes as the axis of symmetry, four four-bend flow channels and four two-bend flow channels are arranged in each 180° circle on both sides.

[0012] Furthermore, the four-bend flow channels and two-bend flow channels on the B-version disk are all through-slot structures.

[0013] Furthermore, the A-plate disk and the B-plate disk are stacked together after being positioned by inserting positioning pins into the corresponding positioning holes.

[0014] Furthermore, the AA T Disc set, BB T In a disk assembly, when a four-bend flow channel on one disk overlaps with a two-bend flow channel on another disk, the overlap forms an overlapping two-bend flow channel, which together constitutes a spatial streamline.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) The spatial streamline labyrinth disk realizes that the flow field adds two bends (overlapping two bends) in a limited space, that is, it adds two stages of pressure reduction, and at the same time forms a three-dimensional spatial streamlined flow channel to achieve more stages of pressure reduction;

[0017] (2) The A-plate disk and the B-plate disk are stacked in opposite directions to form a spatial flow channel, and they serve as the walls of the spatial flow channel to each other, making more effective use of space. The throttling element not only has a thick and sturdy flow channel wall structure and good mechanical properties, but also has a greater flow capacity.

[0018] (3) The A-version and B-version disks have simple structures, which are convenient for batch processing, assembly and disassembly, and timely cleaning of the sludge on the disks.

[0019] (4) The spatial streamline labyrinth disk has a step-by-step pressure reduction function, which gradually reduces the flow velocity and reduces the impact of erosion. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the spatial streamlined labyrinth disk described in this invention.

[0022] Figure 2 This is a structural diagram of the A-version disc.

[0023] Figure 3 This is a structural diagram of the B version disc.

[0024] Figure 4 This is a schematic diagram showing the spatial overlap between a four-bend flow channel on one disk and a two-bend flow channel on another disk in the same group.

[0025] Figure 5 It is AA T Schematic diagram of the spatial flow channels of the disk assembly.

[0026] Figure 6 This is a schematic diagram showing that the contact surfaces of two disks in the same group are the walls of each other.

[0027] Figure 7 This is the fluid flow trajectory and static pressure distribution cloud map inside the multi-stage pressure reducing regulating valve described in this invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] In the diagram: Ⅰ.AA T Disc Group II.BB T Disk set Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0034] like Figure 1 As shown, the spatial streamline labyrinth disc of the multi-stage pressure reducing regulating valve of the present invention includes disc A and disc B; as Figure 2 As shown, the A-plate disk has multiple channels, and these channels are not interconnected; for example... Figure 3 As shown, version B platters have multiple channels that are not interconnected; version A platters are stacked in pairs, one upright and one reversed, to form AA. T Disk Group I, AA T In disk group I, the flow channels at corresponding positions overlap to form the first spatial flow channel (e.g. Figure 5 (As shown); Version B discs are stacked in pairs, one upright and one reversed, to form BB. T Disc Group II, BB T In disk group II, the flow channels at corresponding positions overlap to form a second spatial flow channel (e.g. Figure 6 (As shown); the channels on disk A and disk B are staggered, meaning the first and second spatial channels are not connected; the contact surfaces between two disks in the same group, and the contact surfaces between adjacent disks A and B, serve as the walls of each other's channels; several groups of AA T Disc group I and several groups of BB T Disk group II is arranged alternately along the axial direction to form AA T BB T A spatial streamlined labyrinth disc.

[0035] Furthermore, such as Figure 2 As shown, the flow channels on the A-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two A-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the A-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the A-plate disk is an open structure.

[0036] Furthermore, two positioning holes are symmetrically arranged on the A-plate disk. With the line connecting the centers of the two positioning holes as the axis of symmetry, four four-bend flow channels and four two-bend flow channels are arranged in each 180° circle on both sides.

[0037] Furthermore, the four-bend flow channels and two-bend flow channels on the A-plate disk are all through-slot structures.

[0038] Furthermore, such as Figure 3As shown, the flow channels on the B-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two B-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the B-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the B-plate disk is an open structure.

[0039] Furthermore, two positioning holes are symmetrically arranged on the B-plate disk. With the line connecting the centers of the two positioning holes as the axis of symmetry, four four-bend flow channels and four two-bend flow channels are arranged in each 180° circle on both sides.

[0040] Furthermore, the four-bend flow channels and two-bend flow channels on the B-version disk are all through-slot structures.

[0041] Furthermore, the A-plate disk and the B-plate disk are stacked together after being positioned by inserting positioning pins into the corresponding positioning holes.

[0042] Furthermore, the AA T Disc Group I, BB T In disk group II, after the four-bend flow channel on one disk overlaps with the two-bend flow channel on another disk, the overlap point forms an overlapping two-bend flow channel, which together constitutes a spatial streamline.

[0043] The spatial streamline labyrinth disc of the multi-stage pressure reducing regulating valve described in this invention is obtained based on fluid dynamics calculations. By adjusting the thickness of each disc, the width of the slots, and the number of spatial flow channels, the flow capacity of the multi-stage pressure reducing regulating valve can be changed. Furthermore, the flow capacity of the multi-stage pressure reducing regulating valve can be changed by increasing the number of discs and increasing the stroke of the valve core, while consistently maintaining linear flow characteristics. It should be noted that any technical solution obtained by changing the position and number of flow channels and the number of discs without departing from the principles described in this invention is within the scope of protection of this invention.

[0044] To make the objectives, technical solutions, and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are now described clearly and completely. However, the embodiments described below are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045]

Example

[0046] like Figure 1 As shown in this embodiment, the spatial streamline labyrinth disc of the multi-stage pressure reducing regulating valve is composed of A-plate discs and B-plate discs stacked together.

[0047] like Figure 2 , Figure 3 As shown, in this embodiment, each of the two positioning holes on disc A and disc B has eight flow channels. When they are stacked with another disc of the same type, one facing forward and the other backward, the two flow channels at corresponding positions overlap and connect to form a first spatial flow channel and a second spatial flow channel (e.g., ...). Figure 4 (As shown), and the contact surfaces between the two disks in the same group are the walls of each other's flow channels. For example... Figure 5 As shown, when one A-grade disk and another A-grade disk in the same group are stacked face-up and face-down respectively, the four-bend flow channels on one disk and the two-bend flow channels on the other disk at corresponding positions overlap and connect to form a first spatial flow channel; similarly, when one B-grade disk and another B-grade disk in the same group are stacked face-up and face-down respectively, the four-bend flow channels on one disk and the two-bend flow channels on the other disk at corresponding positions overlap and connect to form a second spatial flow channel. Figure 1 As shown, in this embodiment, there are 4 groups of AA T Disc group I and group 4 BB T Disk groups II are arranged alternately along the axial direction. The first and second spatial flow channels are not interconnected. The contact surfaces of adjacent A-plate disks and B-plate disks serve as the walls of each other's flow channels (e.g., Figure 6 (As shown), forming AA T BB T A spatial streamlined labyrinth disc.

[0048] like Figure 5 As shown, in the first spatial flow channel formed by stacking two A-plate disks, one facing forward and the other backward, the fluid first undergoes four turns through the four-bend flow channel on one disk, then turns twice through the overlapping two-bend flow channel to the adjacent disk, and finally flows out after completing two turns through the two-bend flow channel on that disk. Compared with the planar flow channel set on a conventional disk, the fluid undergoes two more turns at the overlap, forming a spatial streamline; that is, the fluid undergoes eight turns in each first spatial flow channel, thus achieving eight levels of pressure reduction. The flow process of the fluid in the B-plate is the same.

[0049] like Figure 2 , Figure 3 As shown in this embodiment, disk A and disk B are symmetrically provided with two positioning holes of the same size. By assembling positioning pins, the disks are accurately positioned and the corresponding flow channels in the disk group can be precisely overlapped. The flow channels in different positions are ensured to be staggered and not connected to each other.

[0050] In this embodiment, disks A and B are each arranged with eight flow channels evenly distributed within a 180° sector on both sides, with the line connecting the centers of the two mounting holes as the axis of symmetry. That is, 16 groups of spatial flow channels are formed within each disk group. The spatial multi-channel structure ensures the flow capacity of the multi-stage pressure reducing regulating valve, and the sufficiently thick flow channel walls improve the mechanical properties of the overall structure.

[0051] Both version A and version B discs feature a through-groove structure for easy machining. Precise positioning with locating pins ensures the upper valve cover's clamping force holds each disc tightly, preventing overflow. The stacked disc structure facilitates assembly and disassembly, and allows for timely removal of deposits from the labyrinth discs.

[0052] Figure 7 The diagram shows the pressure distribution cloud map of the streamlines within the flow field of the multi-stage pressure-reducing regulating valve described in this invention. It can be seen that the streamlines pass through the spatial flow channels within each disc group, resulting in eight levels of pressure reduction after passing through each group of spatial flow channels. This causes the high pressure difference to be gradually decomposed into smaller pressure differences, and the fluid energy is consumed step by step, resulting in significant energy consumption, noise reduction, and erosion reduction effects.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spatial streamline labyrinth disc for a multi-stage pressure reducing regulating valve, characterized in that, This includes version A platters and version B platters; version A platters have multiple channels, which are not interconnected; version B platters also have multiple channels, which are not interconnected; version A platters are stacked in pairs, one upright and one reversed, to form AA platters. T Disk set, AA T The flow channels at corresponding positions in the platter set overlap to form the first spatial flow channel; B-plate platters are stacked in pairs, one upright and one reversed, to form BB. T Disc set, BB T In the disk group, the flow channels at corresponding positions overlap to form a second spatial flow channel; the flow channels on disk A and disk B are staggered, meaning the first and second spatial flow channels are not connected; the contact surfaces between two disks in the same group, and the contact surfaces between adjacent disks A and B, serve as the walls of each other's flow channels; several groups of AA T Disk sets and several BB sets T The disk assemblies are arranged alternately along the axial direction to form AA T BB T A spatial streamlined labyrinth disc; The flow channels on the A-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two A-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the A-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the A-plate disk is an open structure. The flow channels on the B-plate disk consist of a four-bend flow channel on the inner ring and a two-bend flow channel on the outer ring. When two B-plate disks in the same group are stacked, the four-bend flow channel on one disk and the corresponding two-bend flow channel on the other disk overlap and connect with each other. The inner end of the four-bend flow channel corresponding to the B-plate disk is an open structure, and the outer end of the two-bend flow channel corresponding to the B-plate disk is an open structure.

2. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1, characterized in that, Two positioning holes are symmetrically arranged on the A-plate disk. With the line connecting the centers of the two positioning holes as the axis of symmetry, four four-bend flow channels and four two-bend flow channels are arranged in each 180° circle on both sides.

3. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1 or 2, characterized in that, The four-bend flow channel and the two-bend flow channel on the A-plate disk are all through-slot structures.

4. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The B-plate disk has two symmetrically arranged positioning holes. With the line connecting the centers of the two positioning holes as the axis of symmetry, there are four four-bend flow channels and four two-bend flow channels in each 180° circle on both sides.

5. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1 or 4, characterized in that, The four-bend flow channel and the two-bend flow channel on the B version disk are all through-slot structures.

6. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The A-plate and B-plate disks are stacked together after being positioned by inserting positioning pins into the corresponding positioning holes.

7. The spatial streamline labyrinth disc of a multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The AA T Disc set, BB T In a disk assembly, when a four-bend flow channel on one disk overlaps with a two-bend flow channel on another disk, two overlapping bend flow channels are formed at the overlap point, which together constitute spatial streamlines.

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