An active air-supply double-layer filter device and mask

Abstract

The invention discloses an active air supply type double-layer filtering device, comprising a ventilation channel, wherein a second filter and a first filter are arranged in the ventilation channel; asecond filtering screen is arranged in the second filter; the first filter comprises a first pressing plate, a second pressing plate and a first filtering screen; the first filtering screen is arranged between the first pressing plate and the second pressing plate, and the first filtering screen is made of flame retardant synthetic fiber with antistatic function. Firstly, large particle dust is coarsely filtered through the first filtering screen, so that the active air supply type double-layer filter device provided by the invention has longer service time under the condition that the dust capacity of the second filter is the same. According to the active air supply type double-layer filtering device provided by the invention, the structure of the first filter is simple, so the first filtering layer can be replaced only by opening the first pressing plate and the second pressing plate. The filtering device and mask provided by the invention are particularly suitable for workplaces with high concentration of dust underground coal mines, and the first filter and the second filter can be respectively replaced according to the situation so as to not cause blockage; and the safety ofunderground workers is ensured.

Description

technical field [0001] The invention relates to the technical field of dust protection, in particular to an active air-supply double-layer filter device and a mask. Background technique [0002] High concentrations of dust, especially respirable dust, can easily cause pneumoconiosis. As the most important personal protective equipment, dust masks are an important guarantee for protecting the health of employees, so they are widely used. There are many types of dust masks, which can be divided into two categories: self-priming and active air supply according to the source of power. Among them, active air supply masks are more and more widely used due to the advantages of small breathing resistance and high filtration efficiency. [0003] The dust concentration in coal mines and other places is very high. Because the dust particles in the working air of coal mines are large and small, the existing air supply masks have only one filter layer, and the dust container is easily o...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the existing active air-supply mask cannot effectively filter out dust when it works for a long time in a place with high dust concentration, and the dust holding capacity of the filter device fails after a period of time, the present invention provides an active air-supply mask. Double-layer filter device, which can adapt to the high-concentration dust working environment, and solves the problem that the dust holding capacity of the existing air-supply mask filter is easy to exceed the limit

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