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Heating of powered air units

An active heating and power technology, used in respiratory protection containers, respiratory masks, respiratory protection devices, etc., can solve problems such as fog accumulation and increased disease, and achieve the effect of preventing system overheating and increasing safety.

Inactive Publication Date: 2018-05-22
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

May cause fog to accumulate on the glass inside the mask or welding mask and may also cause increased illness

Method used

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  • Heating of powered air units
  • Heating of powered air units
  • Heating of powered air units

Examples

Experimental program
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Effect test

Embodiment Construction

[0016] figure 1 An exemplary PAPR 10 is shown having an active heating system connected to a welding helmet. The PAPR 10 filters the air by drawing ambient air through the air inlet 11 with a fan. A filter is arranged downstream of the air inlet 11 and a fan pushes ambient air through the filter. An electronically controlled active heating element, such as one in which the temperature or power supplied to the heating system is controlled by a controller or control system, heats the air after it passes through the filter. The filtered and heated air is then drawn through the air outlet 14 , through the hose 16 and to the area around the wearer's face within the welding mask 17 . The control system varies the power supplied to the active heating element and deactivates the active heating element when it detects that the heating element may be overheating.

[0017] One consideration with heating elements is the importance of preventing overheating. Potential overheating of th...

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Abstract

The present invention provides a powered air purifying respirator (PAPR) with an active heating system. The PAPR includes a powered air unit designed to be carried by a user of the PAPR, the powered air unit including a fan and a filter, wherein the fan draws air from the user's environment, passes the air through the filter. The PAPR also includes an electronically controlled active heating element and control system. The control system varies the power supplied to the active heating element and also deactivates the active heating element when it detects that the heating element may be overheating. The invention also includes heating modules for use with PAPRs. The heating module includes electronically controlled active heating elements. The heating element is deactivated when the fan in the PAPR is not spinning.

Description

technical field [0001] The present invention relates to the technical field of powered air units, and in particular, to the technical field of powered air purifying respirators (PAPR). More specifically, the invention relates to heating air filtered through a PAPR. Background technique [0002] Systems that use a powered air source to deliver clean air to the wearer are often referred to as powered air-purifying respirators, abbreviated "PAPR". PAPRs typically include a powered air component that is connected to the mask by a hose. The mask is worn to cover at least the user's nose and mouth (and may also cover the eyes and ears, or in some cases, the entire head), and the powered air component is usually worn around the user's waist. In some cases, the mask may be another device, such as a welding mask. A PAPR typically includes a filter, housing, fan, and motor to drive the fan. Ambient air is filtered by forcing it through a filter consisting of filter elements contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M16/10A62B9/00
CPCA62B7/10A62B9/003A62B18/006A62B18/02A62B9/006A61M16/10
Inventor 马特·U·塞恩费尔特弗雷德里克·A·尼塞尔米哈尔·S·舒尔曼沃茨基
Owner 3M INNOVATIVE PROPERTIES CO
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