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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: 2016-10-26
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

Examples

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Embodiment Construction

[0026] According to certain aspects of the present disclosure, a modal attenuator includes: an annular cavity disposed between a main body of the attenuator and a perforated screen surrounding a main flow path, wherein one or two of the height and width of the annular cavity They vary along the length of the attenuator body, so 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 an expanded cross-sectional form. The modal attenuator includes: an attenuator body along a path from an inlet having a first diameter to an outlet having a second diameter The length of the attenuator extends and defines the main fluid flow path that expands from the inlet to the outlet; and a plurality of cavities spaced apart along the length of the attenuator body, these cavities are defined between the attenuator body and the porous mesh screen, wherein each Each cavity has a width, a...

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PUM

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Abstract

A modal attenuator includes annular chambers disposed between an attenuator body and a perforated screen surrounding a primary flow path. The modal attenuator in some arrangements is in the form of an expander section. In some arrangements one or both of the height and the width of the annular chambers may vary along the length of the attenuator body such that the volumes of the chambers vary along the length of the attenuator body. Each chamber preferably has an open end facing the perforated screen such that acoustic waves passing through the perforated screen can enter into the chamber through the open end.

Description

Technical field [0001] This application relates to modal attenuators, which in some arrangements can be used to reduce noise generated by fluid flowing through process lines (e.g., pipes, valves, or regulators). Background technique [0002] The fluid valve controls the flow of fluid from one location to another. When the fluid valve is in the closed position, the high pressure fluid on one side is prevented from flowing to the low pressure position on the other side of the valve. The pressure difference between the inlet and the outlet of the control valve, together with the tortuous flow path through the control valve, creates a turbulent fluid flow downstream of the control valve, which results in unwanted and potentially harmful noise. [0003] In an attempt to reduce noise, multi-port cages or trims have been used in some regulators to reduce the pressure drop of the cage and smooth downstream flow. However, these cage-type noise reducers also reduce the flow rate of fluid t...

Claims

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Application Information

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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