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Respirators

A respirator and exhalation valve technology, applied in the field of respirators, can solve the problems of restricting exhaled airflow, increasing exhalation resistance, and increasing wearer's discomfort

Inactive Publication Date: 2007-04-04
SCOTT HEALTH & SAFETY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to ensure that the dead zone is effective even in extremely adverse situations, devices in use today tend to restrict exhalation airflow excessively, thereby increasing exhalation resistance and causing increased wearer discomfort

Method used

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Experimental program
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no. 1 approach

[0025] The exhalation valve assembly includes an upstream one-way valve, shown generally at 1 , and a downstream one-way valve, shown generally at 2 . Both valves are mounted in a housing comprising a cylindrical upstream part 3 , a cylindrical intermediate part 4 and a cylindrical downstream part 5 . The downstream part 5 is attached to the middle part 4 through the cooperation of external and internal threads 6 and 7, and the middle part 4 is attached to the upstream part 3 through the cooperation of external and internal threads 8 and 9, thereby blocking the Seat member 10 of valve 1 .

[0026] The upstream part 3 incorporates a flange 11 whereby the housing is sealably attached to the exhalation port of a respirator (not shown). For example, an exhalation hole may be formed in an oronasal mask made of flexible material such that the flange 11 can be slid through the hole so that the mask material sits in an annular groove 12 formed behind the flange 11 .

[0027] Valves ...

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PUM

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Abstract

An exhalation valve assembly for a respirator, said assembly comprising an upstream one-way flap valve (1) and a downstream one-way flap valve (2), both mounted within a housing (3,4,5). The valves (1,2) are spaced apart to define therebetween a volume (25) which acts as a ''dead space'' in which a portion of the just-exhaled air will rest so that, should the upstream valve leak for any reason, any leakage air drawn back into the respirator will be taken from this just-exhaled air, and will thus not be contaminated by the ambient air.

Description

technical field [0001] The present invention relates to respirators, and in particular to exhalation valves for respirators. Background technique [0002] A respirator is a piece of personal protective equipment designed to prevent the wearer from inhaling harmful substances present in the surrounding air. The respirator may be in the form of a simple face mask, attached to the head by means of one or more straps, and covering only the nose and mouth of the wearer. This type of mask is often referred to as an oronasal mask. More complete masks cover the entire face of the wearer and often also include an oral and nasal mask therein, either as a separate mask within the main mask or as separate parts within the main mask. Such masks may provide improved protection over simple oral and nasal masks. Another variation of respirators is a protective hood that surrounds the wearer's head and seals around the neck. The most common variation of respirators is a protective suit, ...

Claims

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Application Information

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IPC IPC(8): A62B9/02A62B18/10
CPCA62B18/10
Inventor 罗伯特·查尔斯·萨顿
Owner SCOTT HEALTH & SAFETY