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Modal attenuator

An attenuator and modal technology, applied in the field of modal attenuators, can solve problems such as difficult assembly and heavy modal suppression devices

Active Publication Date: 2021-01-15
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such modal suppression devices disclosed in MCSD are heavy and difficult to assemble

Method used

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  • Modal attenuator
  • Modal attenuator
  • Modal attenuator

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Embodiment Construction

[0026] According to certain aspects of the present disclosure, a modal attenuator includes: an annular cavity disposed between the attenuator body and a perforated mesh screen surrounding a primary flow path, wherein one or both of the height and width of the annular cavity or vary along the length of the attenuator body such that the volume of these cavities varies along the length of the attenuator body.

[0027] According to certain aspects of the present disclosure, a modal attenuator has the form of an expanded cross-section, the modal attenuator comprising: an attenuator body extending along a path from an inlet having a first diameter to an outlet having a second diameter extending the length of and defining a primary fluid flow path expanding from the inlet toward the outlet; and a plurality of cavities spaced along the length of the attenuator body, the cavities being defined between the attenuator body and the porous mesh, wherein each Each cavity has a width, a heig...

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Abstract

A modal attenuator consisting of a toroidal cavity set between the attenuator body and a porous mesh that surrounds the main flow path. In some arrangements, this modal attenuator has the form of an expanded cross-section. In certain arrangements, the height and width of one or both of the annular cavities may vary along the length of the attenuator body, so that the volume of these cavities changes along the length of the attenuator body. Each cavity preferably has an open end facing the porous mesh sieve, so that sound waves passing through the porous mesh sieve can enter the cavity through the open end.

Description

technical field [0001] The present application relates to modal attenuators, which in some arrangements may be used to reduce noise generated by fluid flowing through a process line (eg, a pipe, valve, or regulator). Background technique [0002] Fluid valves control the flow of fluid from one location to another. When a fluid valve is in a closed position, high pressure fluid on one side is prevented from flowing to a low pressure position on the other side of the valve. The pressure differential between the inlet and outlet of the control valve, combined with the tortuous flow path through the control valve, creates turbulent fluid flow downstream of the control valve, which results in unwanted and potentially harmful noise. [0003] In an attempt to reduce noise, a multiport cage or trim has been used in some regulators to reduce cage pressure drop and smooth downstream flow. However, these cage-type noise reducers also reduce the fluid flow rate through the cage, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K47/02
CPCF16K47/02F02M35/1266F16L55/02781F16L55/0338F01N1/026F16L55/0331
Inventor D·J·艾勒斯A·C·法格隆德
Owner FISHER CONTROLS INT LLC