Vacuum heat-preservation box lid and vacuum heat-preservation lunch box

Abstract

Disclosed are a vacuum heat-preservation box lid and a vacuum heat-preservation lunch box. The vacuum heat-preservation box lid includes: a box lid body; a frame bracket, the frame bracket being connected to the box lid body, the frame bracket being provided with at least one rotatable fastening lug, the fastening lug being provided with an air release hole plug; and a seal ring, the seal ring being connected to the box lid body, the seal ring being provided with an air release hole for communicating an inside of a box body with the outside. When the fastening lug is snapped shut, the air release hole plug is in interference fit with the air release hole, thus blocking the air release hole. When the fastening lug is opened, the air release hole plug is separated from the air release hole, thus unblocking the air release hole.

1 . A vacuum heat-preservation box lid comprising:
 a box lid body;   a frame bracket, the frame bracket being connected to the box lid body, the frame bracket being provided with at least one rotatable fastening lug, the fastening lug being provided with an air release hole plug; and   a seal ring, the seal ring being connected to the box lid body, the seal ring being provided with an air release hole for communicating an inside of a box body with an outside, wherein   when the fastening lug is snapped shut, the air release hole plug is in interference fit with the air release hole, thus blocking the air release hole; when the fastening lug is opened, the air release hole plug is separated from the air release hole, thus unblocking the air release hole.   
     
     
         2 . The vacuum heat-preservation box lid according to  claim 1 , wherein the box lid body is configured as a hollow structure and the inside of the box lid body is vacuumed to form a vacuum cavity. 
     
     
         3 . The vacuum heat-preservation box lid according to  claim 2 , wherein the box lid body comprises first and second sheets formed by stamping, the first sheet and the second sheet are brought together and connected by welding, and the vacuum cavity is located between the first sheet and the second sheet. 
     
     
         4 . The vacuum heat-preservation box lid according to  claim 3 , wherein the box lid body is provided with a circle of step portions with a zigzag cross-section at an edge of its lower surface, and the seal ring is fitted over the step portions and is stuck by the step portions. 
     
     
         5 . The vacuum heat-preservation box lid according to  claim 1 , wherein the frame bracket is provided with a fastening block and mounted on an upper surface of the box lid body, and the fastening block is fastened to the edge of the lower surface of the box lid body so that the frame bracket is fixed to the box lid body. 
     
     
         6 . The vacuum heat-preservation box lid according to  claim 3 , wherein a decorative recess is formed on the upper surface of the box lid body, an air void for vacuuming is formed in the decorative recess, and a decorative sheet is arranged in the decorative recess and covers the air void. 
     
     
         7 . The vacuum heat-preservation box lid according to  claim 1 , wherein the air release hole runs laterally through the seal ring, and two ends of the air release hole are located on outer and inner sides of the seal ring, respectively. 
     
     
         8 . The vacuum heat-preservation box lid according to  claim 7 , wherein the seal ring is configured as a lip-shaped seal ring with a lip inward. 
     
     
         9 . A vacuum heat-preservation lunch box comprising the vacuum heat-preservation box lid according to  claim 1  and further comprising a box body  500 , when the vacuum heat-preservation box lid is connected to the box body, the box lid body being connected to the box body by the seal ring and the fastening lug  300  being fastened to the box body. 
     
     
         10 . The vacuum heat-preservation lunch box according to  claim 9 , wherein the box body is configured as a double-layer metal structure, and the box body has a vacuum inner cavity formed by vacuumizing between two metal layers.