The filter mask is a personal respiratory protection device with a large filtering field of view and double rubber edges. It is mainly composed of filter elements, masks, exhalation devices, headbands and other components. It can effectively protect the wearer's face and protect the eyes and respiratory tract from toxic agents, biological warfare agents and radioactive dust. It can be used by people in different fields such as industry, agriculture, medical treatment, fire fighting, scientific research, and can also be used by the military, police and civil defense. Taking coal mining as an example, this article introduces a helmet with protection and filtering functions and how to detect the flow rate of the air inlet of a safety helmet with filtering.
Generally, miners work in a harsh environment. Not only do they have to deal with dust generated by mining, but the ventilation in mines is poor. Toxic gases in mines cannot be discharged quickly and are easily inhaled by workers. During coal mining, coal miners need to wear safety helmets. Traditional safety helmets generally do not have filtering functions. In dusty conditions, they usually wear masks to reduce the inhalation of dust or toxic gases, which is very harmful to the human body. However, wearing masks can easily restrain the face, and has poor air permeability. It is not comfortable to wear for a long time and has certain limitations.
Therefore, a helmet with an adjustable filter is needed, so that the filter can be used when there is a lot of dust. When the dust hazard is large, the mask can be held by hand, and then the mask is pulled out of the guide rail, and then the mask is put on the user's mouth and nose. If the elastic rope is too loose or tight, the limit column can be pulled outward and then rotated, and the winding roller will adjust the tightness of the elastic rope, so that the user feels more comfortable. When the dust is small, the filter is not used, so that the applicability is improved.
When the dust hazard is large, you can hold the mask with your hands, then pull the mask out of the guide rail, and then put the mask on the user's mouth and nose. If the elastic rope is too loose or tight, you can pull the limit column outward and then rotate it. The winding roller will adjust the tightness of the elastic rope, so that the user feels more comfortable. However, it should be noted that in a relatively harsh environment, dust and other particles will cause blockage. A flow rate sensor is needed to detect the flow rate of the air inlet of the filter safety helmet to ensure the comfort and safety of wearing a filter dust mask at work. Gongcai.com's mass flow anti-blocking sensor -FS7002 is designed for rapid measurement of flow rate changes . The unique packaging technology enables it to measure different ranges of flow under the same pipe diameter. Mass production ensures high reliability, high performance and low cost. It is suitable for various general-purpose clean and dry gas equipment, such as the cooling system of LCD projectors, air purifiers, various instruments , ventilation ducts or fan motors.