Apparatus and method reducing humidity in respiratory protective device

Patent metadata

Field	Value
Publication number	US-12569703-B2
Application number	US-202218060895-A
Country	US
Kind code	B2
Filing date	Dec 1, 2022
Priority date	Dec 15, 2021
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

Apparatuses and methods reducing humidity in respiratory protective devices are provided. For example, an example respiratory protective device includes a humidity sensor component embedded in an exhalation filtration component of the respiratory protective device, at least one fan component positioned adjacent to an inhalation filtration component of the respiratory protective device, and a controller component in electronic communication with the humidity sensor component and the at least one fan component.

First claim

The invention claimed is:

1 . A respiratory protective device comprising:
a humidity sensor component embedded in an exhalation filtration component of the respiratory protective device; at least one fan component positioned adjacent to an inhalation filtration component of the respiratory protective device; and a controller component in electronic communication with the humidity sensor component and the at least one fan component, wherein the controller component is configured to:
receive a humidity indication from the humidity sensor component, wherein the humidity indication comprises a humidity value;
calculate a humidity difference value between the humidity value and a threshold humidity value;
determine a reverse rotation speed value for the at least one fan component based on the humidity difference value; and
determine a reverse rotation start signal transmission time point and a reverse rotation stop signal transmission time point for the at least one fan component based at least in part on the reverse rotation speed value.

2 . The respiratory protective device of claim 1 , wherein, when determining the reverse rotation speed value based on the humidity difference value, the controller component is configured to:
compare the humidity difference value with a previous humidity difference value, wherein the previous humidity difference value is associated with a previous reverse rotation speed value of the at least one fan component.

3 . The respiratory protective device of claim 2 , wherein the controller component is configured to:
determine that the humidity difference value increases from the previous humidity difference value; calculate a humidity difference increase value based on subtracting the previous humidity difference value from the humidity difference value; determine a reverse rotation speed increase value based at least in part on the humidity difference increase value; and set the reverse rotation speed value based at least in part on adding the reverse rotation speed increase value to the previous reverse rotation speed value.

4 . The respiratory protective device of claim 2 , wherein the controller component is configured to:
determine that the humidity difference value decreases from the previous humidity difference value; calculate a humidity difference decrease value based on subtracting the humidity difference value from the previous humidity difference value; determine a reverse rotation speed decrease value based at least in part on the humidity difference decrease value; and set the reverse rotation speed value based at least in part on subtracting the reverse rotation speed decrease value from the previous reverse rotation speed value.

5 . The respiratory protective device of claim 1 , further comprising:
a pressure sensor component disposed on an inner surface of the respiratory protective device.

6 . The respiratory protective device of claim 5 , wherein the controller component is configured to:
receive a plurality of air pressure indications from the pressure sensor component, wherein the plurality of air pressure indications comprises a plurality of air pressure values.

7 . The respiratory protective device of claim 6 , wherein, when determining the reverse rotation start signal transmission time point, the controller component is configured to:
calculate a reverse rotation speed up adjustment time period based at least in part on the reverse rotation speed value; determine an exhalation starting time point based at least in part on the plurality of air pressure indications; and set the reverse rotation start signal transmission time point based on the exhalation starting time point and the reverse rotation speed up adjustment time period.

8 . The respiratory protective device of claim 7 , wherein the controller component is configured to:
transmit a reverse rotation start signal to the at least one fan component at the reverse rotation start signal transmission time point.

9 . The respiratory protective device of claim 6 , wherein, when determining the reverse rotation stop signal transmission time point, the controller component is configured to:
calculate a reverse rotation slow down adjustment time period based at least in part on the reverse rotation speed value; determine an inhalation starting time point based at least in part on the plurality of air pressure indications; and set the reverse rotation stop signal transmission time point based on the inhalation starting time point and the reverse rotation slow down adjustment time period.

10 . The respiratory protective device of claim 9 , wherein the controller component is configured to:
transmit a reverse rotation stop signal to the at least one fan component at the reverse rotation stop signal transmission time point.

Assignees

• Honeywell Safety Products Usa Inc

Inventors

• Chen Enyi
• Han Xiaojin
• Tian Hang
• Shi Wei

Classifications

• A62B18/006

  with pumps for forced ventilation (A62B18/045 takes precedence) · CPC title

• A62B18/08

  Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices (eye-pieces for protective goggles A61F9/02; composition of materials for the windows or other transparent parts A62D7/00) · CPC title

• A62B9/006

  Indicators or warning devices, e.g. of low pressure, contamination · CPC title

• A62B7/10 Primary

  with filter elements · CPC title

• A62B9/003 Primary

  Means for influencing the temperature or humidity of the breathing gas · CPC title