Protective mask
The protective mask comprises a first sealing cover, a second sealing cover and a filter element, the first sealing cover and the second sealing cover are each provided with an arch structure with aninward opening, and a first protective cavity covering the nose is formed in the inner side of the fi...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The protective mask comprises a first sealing cover, a second sealing cover and a filter element, the first sealing cover and the second sealing cover are each provided with an arch structure with aninward opening, and a first protective cavity covering the nose is formed in the inner side of the first sealing cover; the second sealing cover is arranged outside the first sealing cover, and a second protection cavity covering the opening is formed between the second sealing cover and the exterior of the first sealing cover. The filter element is arranged between the outer side of the second sealing cover and the second sealing cover to form a filter cavity; the protective mask further comprises a first air inlet one-way valve, a first air outlet one-way valve, a second air inlet one-way valve and a second air outlet one-way valve, and the first air inlet one-way valve penetrates from the filter cavity to the first protective cavity and can be opened towards the first protective cavity;the first air outlet one- |
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