Axial-flow type maze throttling structure

Abstract

The invention discloses an axial-flow type maze throttling structure. The axial-flow type maze throttling structure is mainly and technically characterized in that a maze throttling assembly composed of a maze outer sleeve and a maze inner core is arranged in an outer side pressure-bearing body, the maze inner core is arranged in the center position, and the maze outer sleeve wraps the periphery of the maze inner core; a plurality of platy transverse partitions are arranged between the maze outer sleeve and the maze inner core, and a plurality of through holes are distributed in a bottom plate of the maze inner core; the transverse partitions on the maze outer sleeve and the transverse partitions on the maze inner core are sequentially arrayed in a staggered mode, a certain gap is kept between every two adjacent transverse partitions, certain gaps are kept between the inner diameters of transverse partitions on the maze outer sleeve and the outer diameter of the cylindrical face of the maze inner core, certain gaps are kept between the outer diameters of the transverse partitions on the maze inner core and the diameters of the cylindrical holes in the outer sleeve, and therefore a maze passageway which allows fluid to continuously turn by 90 degrees is formed; the maze outer sleeve is made of two same symmetrical half pieces. The axial-flow type maze throttling structure has the advantages that the good throttling and speed reduction effect, the good vibration and noise reduction effect, the good effect of preventing damage caused by washing and the good effect of reducing and eliminating damage caused by gas corrosion are achieved, the axial-flow type maze throttling structure can not be blocked by sundries when running, and the axial-flow type maze throttling structure is simple and compact in structure, small in occupied space, small in part number and low in manufacturing cost.

Description

technical field [0001] The invention relates to a valve and pipeline accessory structure, in particular to a high-pressure differential throttling and speed-reducing structure. Background technique [0002] With the development of science and technology, various process piping systems are faced with more and more high-pressure differential conditions. At the same time, as the capacity and parameters of the system and unit increase, the pressure differential of the supporting valves is also increasing. come higher. When the valve operates under the condition of high pressure difference, because of the high flow velocity of the fluid, it will cause serious vibration, noise, erosion and even cavitation damage, shorten the service life of the valve, and increase the operating cost of the unit. [0003] For high pressure differential conditions, there are many throttling and speed reduction structures currently used on valves, mainly including: porous sleeve or multi-stage porou...

AI Technical Summary

Problems solved by technology

In addition to the multi-layer labyrinth disc throttling structure, the other throttling structures have the following common disadvantages: 1. When the pressure difference is high, the labyrinth throttling series can be easily reduced compared with the labyrinth disc throttling structure. Do tens of levels, the fluid flow rate can be effectively reduced to tens of meters per second, other throttling structures are difficult to achieve a throttling series that can really achieve a more ideal speed reduction effect, such as: a famous German The company's multi-stage cage-type porous sleeve pressure-relief valve has a maximum of 7 to 9 stages of the porous sleeve, and the HUSH multi-layer porous sleeve for high pressure differential conditions has a maximum Due to the limitation of space and structure, the number of throttling stages of plunger throttling and multi-layer porous disc is difficult to exceed ten.

The throttling series is limited, and it is naturally difficult to achieve ideal throttling and speed reduction, vibration and noise reduction, and the effects of reducing and eliminating erosion and cavitation damage when the pressure difference is high; 2. The space or length of the throttling structure 3. Due to the different structural characteristics of different throttling structures, compared with the labyrinth disc throttling structure, the pressure drops continuously during the throttling process and there is no pressure rise. The pressure rise accompanying capacity expansion can easily lead to cavitation and cavitation damage

[0004] The throttling structure of the labyrinth disk has many throttling stages and the pressure continuously drops without pressure rise during the throttling process. Therefore, in various throttling structures, it is the best choice for throttling and speed reduction, vibration reduction and noise reduction, avoiding erosion damage, and reducing and eliminating The structure with the best effect of cavitation damage will have a good application effect when used on various high-pressure differential regulating valves, but if the labyrinth disc throttling structure is applied to high-pressure differential cut-off valves that do not require adjustment When applied to valves and pipelines or to some high-pressure differential regulating valves that are mainly regulated at large openings, there are some shortcomings: 1. There are many parts, complex structures, large space occupation, and high cost ;2. Due to the small cross-sectional size of the flow channel of the labyrinth groove on the labyrinth disk, when the medium contains solid and granular substances such as impurities, dirt, welding slag, solder joints, and scale, such as a high-pressure differential blowdown valve used for boiler blowdown And the high-pressure differential valves on some pipelines that were put into use after the overhaul is completed. If the labyrinth disk structure is used on these valves to decompress and slow down, the labyrinth groove will be easily blocked and the valve will not be used.

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