Multi-hole type valve cage structure and regulating valve

Abstract

The utility model relates to the technical field of regulating valves, in particular to a multi-hole type valve cage structure and a regulating valve, and the multi-hole type valve cage structure comprises a plurality of stages of valve cages which are mutually nested; each stage of valve cage is provided with a plurality of throttling holes, the throttling holes are stepped holes, the front ends of the throttling holes in the fluid flowing direction are first hole diameters, the rear ends of the throttling holes in the fluid flowing direction are second hole diameters, and the first hole diameters are smaller than the second hole diameters. Through the multi-stage nested design, the overall pressure difference is dispersed to all stages of valve cages, the pressure drop amplitude of each stage is effectively reduced, and therefore the phenomena of flash evaporation and cavitation which are likely to happen under the high-pressure-difference working condition are remarkably restrained. The throttling holes in each stage of valve cage are of a stepped hole structure, the small hole diameter at the front end contracts fluid to improve the local flow speed, the large hole diameter at the rear end expands to reduce part of pressure and slow down the flow speed change, the energy release rate is reduced through the throttling holes of the multistage valve cage, and noise and vibration are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to a multi-hole valve cage structure and regulating valve. Background Technology

[0002] In industries such as petrochemicals, power generation, pharmaceuticals, and food processing, fluid control typically faces challenges such as high pressure differentials, large flow rate variations, and complex fluid characteristics. Control valves used in high pressure differential conditions are highly susceptible to flashing and cavitation, which can be accompanied by noise and vibration. In severe cases, this can even damage internal valve components and downstream pipelines, leading to valve leakage and reduced service life.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] This invention provides a multi-hole valve cage structure and a regulating valve, thereby effectively solving the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a porous valve cage structure, comprising:

[0006] Several levels of valve cages, with the valve cages nested together;

[0007] A plurality of throttling orifices are provided on each stage of the valve cage. The throttling orifices are stepped orifices. The front end of the throttling orifice in the fluid flow direction has a first orifice diameter, and the rear end of the throttling orifice in the fluid flow direction has a second orifice diameter. The first orifice diameter is smaller than the second orifice diameter.

[0008] Furthermore, a gap is provided between each stage of the valve cage, so that after the fluid flows out of the throttling orifice of the previous stage valve cage, it passes through the gap and then enters the throttling orifice of the next stage valve cage.

[0009] Furthermore, each stage of the valve cage has fixed ends at both ends in the length extension direction, and the gap is located between the fixed ends at both ends in the length extension direction.

[0010] Furthermore, the innermost valve cage is provided with a cage seat, and the cage seat is provided with a plurality of slots, each of which corresponds to the outer valve cage. The outer valve cage is installed on the cage seat and positioned by the slots.

[0011] Furthermore, the valve cages of several stages are welded together to form a whole;

[0012] The valve cage is provided with a stop, which is used for installation and positioning and is coaxial with the valve core.

[0013] Furthermore, the cage base is provided with threaded holes for installation or disassembly.

[0014] Furthermore, the throttling orifices on the first-stage valve cage are designed and distributed according to the flow characteristics requirements of the regulating valve. The throttling orifices of the remaining valve cages are arranged in a group along the length extension direction of the valve cage, and several groups are arranged along the circumference of the valve cage. The throttling orifices in each group are arranged at equal intervals, and the several groups of throttling orifices are arranged at equal angles.

[0015] Furthermore, the throttling orifices on adjacent valve cages are misaligned.

[0016] This utility model also includes a regulating valve, comprising the multi-hole valve cage structure as described above.

[0017] The beneficial effects of this invention are as follows: Through a multi-stage nested design, the overall pressure difference is distributed to each stage of the valve cage, effectively reducing the pressure drop at each stage and thus significantly suppressing flashing and cavitation phenomena that are prone to occur under high pressure differential conditions. The throttling orifices on each stage of the valve cage adopt a stepped orifice structure. The small-diameter orifice at the front end first contracts the fluid, increasing the local flow velocity, while the large-diameter orifice at the rear end expands, reducing some pressure and slowing down the velocity change. The energy release rate is reduced through the throttling orifices of the multi-stage valve cage, effectively reducing noise and vibration. Furthermore, the multi-stage throttling path can stabilize the fluid flow, improve regulation accuracy, extend the service life of internal valve components and downstream pipelines, and improve the safety and reliability of system operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A cross-sectional view of a porous valve cage structure;

[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a schematic diagram of a porous valve cage structure.

[0022] Figure 4 A schematic diagram of the innermost valve cage;

[0023] Figure 5This is a schematic diagram of the outermost valve cage. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] like Figures 1 to 5 As shown: A porous valve cage structure, comprising:

[0026] Several levels of valve cage 1 are nested together;

[0027] Several throttling orifices 2 are provided on each stage of valve cage 1. The throttling orifices 2 are stepped orifices. The front end of the throttling orifice 2 in the fluid flow direction has a first orifice diameter, and the rear end of the throttling orifice 2 in the fluid flow direction has a second orifice diameter. The first orifice diameter is smaller than the second orifice diameter.

[0028] Through a multi-stage nested design, the overall pressure difference is distributed across each stage of the valve cage 1, effectively reducing the pressure drop at each stage and significantly suppressing flashing and cavitation phenomena that are prone to occur under high pressure differential conditions. The throttling orifice 2 on each stage of the valve cage 1 adopts a stepped orifice structure. The smaller orifice at the front end contracts the fluid, increasing the local flow velocity, while the larger orifice at the rear end expands, reducing some pressure and slowing down velocity changes. The energy release rate is reduced through the throttling orifice 2 of the multi-stage valve cage 1, effectively reducing noise and vibration. Furthermore, the multi-stage throttling path can stabilize the fluid flow, improve regulation accuracy, extend the service life of internal valve components and downstream pipelines, and enhance the safety and reliability of system operation.

[0029] like Figure 2 As shown, in this embodiment, a gap 11 is provided between each valve cage 1. After the fluid flows out from the throttling hole 2 of the upper valve cage 1, it passes through the gap 11 and then enters the throttling hole 2 of the lower valve cage 1.

[0030] A gap 11 is provided between each stage of valve cage 1. After the fluid flows out of the throttling orifice 2 of the previous stage valve cage 1, it first passes through the gap 11 region before entering the throttling orifice 2 of the next stage valve cage 1. This structural design helps to form a buffer zone between each throttling stage, allowing the fluid to gradually diffuse and decelerate during the multi-stage pressure reduction process, thereby further reducing the local pressure drop rate and suppressing cavitation. In addition, the gap 11 region also helps to disturb the flow field, disperse turbulent structures, reduce noise and vibration levels, and improve the stability and reliability of fluid regulation.

[0031] In this configuration, each valve cage 1 has two fixed ends 12 at both ends in the length extension direction, and the gap 11 is located between the two fixed ends 12 at both ends in the length extension direction.

[0032] Each valve cage 1 has fixed ends 12 at both ends along its length to securely position each valve cage 1, while the gap 11 is located in the middle region between the two fixed ends 12. This structure not only ensures the coaxial nesting and overall stability of the valve cages 1, but also ensures that the fluid can be buffered and diffused in a relatively closed and controlled space after flowing out of the throttling orifice 2, effectively controlling flow velocity changes and further suppressing cavitation and vibration. At the same time, this arrangement is beneficial for processing and assembly, improving the structural strength and service life of the product.

[0033] like Figure 3 and Figure 4 As shown, the innermost valve cage 1 is provided with a cage seat 13, and the cage seat 13 is provided with several slots 131. The slots 131 correspond to the outer valve cage 1 respectively. The outer valve cage 1 is installed on the cage seat 13 and is positioned by the slots 131.

[0034] The innermost valve cage 1 is equipped with a cage seat 13, which has several bayonets 131, each corresponding to a different stage of the outer valve cage 1. The outer valve cages 1 are sequentially installed on the cage seat 13 and accurately positioned using the corresponding bayonets 131. This structural design facilitates the rapid assembly and precise coaxial arrangement of the multi-stage valve cages 1, ensuring the effective alignment of the throttling orifice 2 in the multi-stage throttling path, thereby improving the throttling effect and fluid control accuracy. Simultaneously, the bayonet 131 positioning structure enhances the overall mechanical stability, contributing to improved vibration resistance and long-term operational reliability of the valve cage 1 assembly under high differential pressure conditions.

[0035] Among them, several stages of valve cage 1 are welded together to form a whole;

[0036] The valve cage is provided with a stop 14, which is used for installation and positioning and is coaxial with the valve core.

[0037] Several valve cages 1 are connected by welding to form an integrated structure. This design effectively improves the connection strength and overall rigidity between the multi-stage valve cages 1, avoiding performance degradation or structural damage caused by loose assembly or misalignment under conditions such as high pressure differential and high frequency vibration. Simultaneously, welding into a single unit reduces assembly errors, ensures the precise relative position of each stage of the throttling orifice 2, improves throttling effect and fluid control stability, helps extend valve service life and reduce maintenance costs, and facilitates subsequent online maintenance.

[0038] As a preferred embodiment of the above, the cage base 13 is provided with a threaded hole 132 for installation or disassembly.

[0039] The cage base 13 is provided with threaded holes 132 for installing or removing the multi-stage valve cage 1 structure. The threaded holes 132 are designed to facilitate the fixing or disassembly of the valve cage 1 assembly using tools, simplifying maintenance, replacement, and assembly processes, and improving the convenience and efficiency of on-site operations. At the same time, this structure also helps to achieve modular maintenance without damaging the overall structure, reducing maintenance costs and enhancing the maintainability and engineering application value of the system.

[0040] like Figure 4 and Figure 5 As shown, in this embodiment, the innermost layer is the first-stage valve cage 1. The throttling orifices 2 on the first-stage valve cage 1 are designed and distributed according to the flow characteristics requirements of the regulating valve. The throttling orifices 2 of the remaining valve cages 1 are arranged in a group along the length extension direction of the valve cage 1. Several groups are arranged along the circumference of the valve cage 1. Each group of throttling orifices 2 is arranged at equal intervals, and several groups of throttling orifices 2 are arranged at equal angles.

[0041] The throttling orifices 2 on the first-stage valve cage 1 are designed and distributed according to the flow characteristics requirements of the regulating valve to achieve precise control of the initial pressure difference and flow rate. The throttling orifices 2 on the remaining stages of the valve cage 1 are arranged in several groups along the length of the valve cage 1, with each group of orifices 2 evenly spaced in that direction. Multiple groups of throttling orifices 2 are also arranged circumferentially along the valve cage 1, with each group distributed at equal angles. This distribution helps to achieve uniform fluid distribution during the multi-stage throttling process, mitigates sudden changes in local flow velocity, further suppresses cavitation, reduces noise and vibration, and improves the stability and regulation accuracy of the throttling process.

[0042] Among them, the throttling orifices 2 on adjacent valve cages 1 are misaligned.

[0043] The throttling orifices 2 on adjacent valve cages 1 are staggered, meaning that the throttling orifices 2 on each stage of valve cage 1 are not perfectly aligned in the axial or circumferential direction. This design effectively breaks up the straight flow path of the fluid during multi-stage throttling, causing the fluid to change direction multiple times, thereby reducing local velocity peaks and energy concentration, and further suppressing flashing and cavitation. Simultaneously, the staggered arrangement helps reduce vibration and noise, improves fluid flow stability, and extends the service life of valves and related components.

[0044] This embodiment also includes a regulating valve, comprising the porous valve cage structure described above.

[0045] Through a multi-stage nested design, the overall pressure difference is distributed across each stage of the valve cage 1, effectively reducing the pressure drop at each stage and significantly suppressing flashing and cavitation phenomena that are prone to occur under high pressure differential conditions. The throttling orifice 2 on each stage of the valve cage 1 adopts a stepped orifice structure. The smaller orifice at the front end contracts the fluid, increasing the local flow velocity, while the larger orifice at the rear end expands, reducing some pressure and slowing down velocity changes. The energy release rate is reduced through the throttling orifice 2 of the multi-stage valve cage 1, effectively reducing noise and vibration. Furthermore, the multi-stage throttling path can stabilize the fluid flow, improve regulation accuracy, extend the service life of internal valve components and downstream pipelines, and enhance the safety and reliability of system operation.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-orifice cage structure, characterized by, include: Several levels of valve cages, with the valve cages nested together; A plurality of throttling orifices are provided on each stage of the valve cage. The throttling orifices are stepped orifices. The front end of the throttling orifice in the fluid flow direction has a first orifice diameter, and the rear end of the throttling orifice in the fluid flow direction has a second orifice diameter. The first orifice diameter is smaller than the second orifice diameter.

2. The perforated cage structure of claim 1, wherein, A gap is provided between each stage of the valve cage. After the fluid flows out of the throttling orifice of the valve cage of the previous stage, it passes through the gap and then enters the throttling orifice of the valve cage of the next stage.

3. The perforated cage structure of claim 2, wherein, Each valve cage has fixed ends at both ends in the length extension direction, and the gap is located between the fixed ends at both ends in the length extension direction.

4. The perforated cage structure of claim 1, wherein, The innermost valve cage is provided with a cage seat, and the cage seat is provided with a plurality of slots, each of which corresponds to the outer valve cage. The outer valve cage is installed on the cage seat and is positioned by the slots.

5. The perforated cage structure of claim 4, wherein, The valve cages of several stages are welded together to form a whole; The valve cage is provided with a stop, which is used for installation and positioning and is coaxial with the valve core.

6. The perforated cage structure of claim 4, wherein, The cage base is provided with threaded holes for installation or disassembly.

7. The perforated cage structure of claim 1, wherein, The throttling orifices on the first-stage valve cage are designed and distributed according to the flow characteristics requirements of the regulating valve. The throttling orifices of the remaining valve cages are arranged in a group along the length extension direction of the valve cage, and several groups are arranged along the circumference of the valve cage. The throttling orifices in each group are arranged at equal intervals, and the throttling orifices in several groups are arranged at equal angles.

8. The perforated cage structure of claim 7, wherein, The throttling orifices on adjacent valve cages are misaligned.

9. A regulating valve, characterized by Includes the porous valve cage structure as described in any one of claims 1 to 8.

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