US 11,701,529 B2
Air supply mechanism with lower air duct, headgear and electric protective equipment
Weiren Gao, Changzhou (CN)
Assigned to CHANGZHOU SHINE SCIENCE & TECHNOLOGY CO., LTD., Jiangsu (CN)
Filed by CHANGZHOU SHINE SCIENCE & TECHNOLOGY CO., LTD., Changzhou (CN)
Filed on Dec. 25, 2021, as Appl. No. 17/561,934.
Application 17/561,934 is a continuation of application No. PCT/CN2021/072970, filed on Jan. 21, 2021.
Claims priority of application No. 202110021956.X (CN), filed on Jan. 8, 2021.
Prior Publication US 2022/0219024 A1, Jul. 14, 2022
Int. Cl. A62B 23/02 (2006.01); A62B 7/10 (2006.01); A62B 18/04 (2006.01); A62B 18/00 (2006.01); A41D 13/11 (2006.01)
CPC A62B 23/02 (2013.01) [A41D 13/11 (2013.01); A62B 7/10 (2013.01); A62B 18/003 (2013.01); A62B 18/04 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An air supply mechanism with a lower air duct, comprising:
an air inlet mask, the front of the air inlet mask being raised in an arc shape and the back of the air inlet mask being arranged to fit to a human face, the air inlet mask including a first ventilation structure and a second ventilation structure connecting the front and back;
an air supply pipe fixed on one side of the air inlet mask and in communication with the first ventilation structure and the second ventilation structure to supply air to the front of the air inlet mask; and
a filter screen fixedly covering the first ventilation structure to filter the air entering the first ventilation structure from the front of the air inlet mask;
wherein when the air inlet mask fits to the human face, the first ventilation structure is arranged at the position of the nose and mouth and the second ventilation structure is arranged under the eyes, the first ventilation structure is provided with a plurality of ventilation holes, and the second ventilation structure is provided with an air inlet duct arranged toward an upper side in the height direction of the air inlet mask, the front side of the air inlet mask is semi-closed or fully closed, and the air blown by the air supply pipe partially or completely passes into the first ventilation structure and the second ventilation structure, and the diameter of filter holes of the filter screen is not greater than 2 mm,
wherein the plurality of ventilation holes is provided with a ventilation pipe, one end of the ventilation pipe is connected to the front of the air inlet mask where the ventilation holes are located, and the other end extends away from the air inlet mask,
wherein the diameter of the end of the ventilation pipe away from the air inlet mask is less than the diameter of the end close to the air inlet mask,
wherein the first ventilation structure further includes an enclosure arranged perpendicular to the body of the air inlet mask and surrounding the plurality of the ventilation holes to form an air inlet chamber,
wherein the height of the enclosure close to the air supply pipe is lower than the height of the enclosure away from the air supply pipe, and
wherein the enclosure is arranged open at a central position between the upper side and a lower side in the height direction of the air inlet mask.