Airtight structure of airtight powder case

Abstract

An airtight structure of an airtight powder case includes a powder tray and an inner lid, where the inner lid is hinged to one side of the powder tray through a rotating shaft; the inner lid is configured to open and close the powder tray; an aperture of the powder tray is provided with a seal ring; the seal ring includes a first seal ring and a second seal ring; a lower side of the second seal ring is located at the aperture of the powder tray; a lower side of the first seal ring is connected to an upper side of the second seal ring (a die may be used for integral injection molding); the second seal ring is hard, while the first seal ring is soft; and an upper side of the first seal ring is shaped as a downward flanging, and the flanging forms a top.

What is claimed is: 
     
         1 . An airtight structure of an airtight powder case, comprising a powder tray and an inner lid, wherein the inner lid is hinged to a first side of the powder tray through a rotating shaft; the inner lid is configured to open and close the powder tray; an aperture of the powder tray is provided with a seal ring; the seal ring comprises a first seal ring and a second seal ring; a lower side of the second seal ring is located at the aperture of the powder tray; a lower side of the first seal ring is connected to an upper side of the second seal ring; the second seal ring is hard, while the first seal ring is soft; an upper side of the first seal ring is shaped as a downward flanging; the downward flanging forms a top; and a bottom of the inner lid is configured to abut against the top of the downward flanging. 
     
     
         2 . The airtight structure of the airtight powder case according to  claim 1 , wherein an edge of the downward flanging formed on the first seal ring compresses an outer side of the second seal ring. 
     
     
         3 . The airtight structure of the airtight powder case according to  claim 1 , wherein a circle of first rabbet is formed at the aperture of the powder tray; and the first seal ring and the second seal ring are located in the first rabbet. 
     
     
         4 . The airtight structure of the airtight powder case according to  claim 1 , wherein the downward flanging at the upper side of the first seal ring forms an arched top. 
     
     
         5 . The airtight structure of the airtight powder case according to  claim 1 , wherein a circle of second rabbet is formed in the bottom of the inner lid; an inner side of the second rabbet serves as a first rabbet edge; an outer side of the second rabbet serves as a second rabbet edge; the seal ring is located in an inner ring formed by the first rabbet edge; a circle of shoulder is provided on an inner wall of the aperture of the powder tray; and a lower end of the second rabbet edge is configured to abut against the shoulder. 
     
     
         6 . The airtight structure of the airtight powder case according to  claim 1 , wherein the inner lid is buckled with the other a second side of the powder tray through a fastener.