Ventilation device

Abstract

A ventilation device includes: a lid configured to open and close a ventilation port, a drive mechanism configured to displace the lid between an opening position and a closing position; a sealing member located between the base portion and the lid and surrounding the ventilation port; and a pressing portion configured to press the lid toward the base portion.

1 . A ventilation device comprising:
 a base portion having a ventilation port for allowing an inside and an outside of a container body to communicate with each other;   a lid configured to open and close the ventilation port;   a drive mechanism configured to displace the lid between an opening position and a closing position;   a sealing member located between the base portion and the lid and surrounding the ventilation port; and   a pressing portion configured to press the lid toward the base portion.   
     
     
         2 . The ventilation device of  claim 1 , wherein
 the pressing portion is provided in the drive mechanism.   
     
     
         3 . The ventilation device of  claim 2 , wherein
 the drive mechanism includes
 a drive source and 
 a drive shaft driven by the drive source, and 
   the pressing portion includes a spring provided along the drive shaft.   
     
     
         4 . The ventilation device of  claim 1 , wherein
 a raised portion projecting toward the sealing member is provided between the lid and the base portion.   
     
     
         5 . The ventilation device of  claim 4 , wherein
 the pressing portion is configured to press a center part of the lid toward the base portion, and   a projecting height of the raised portion increases from the center part of the lid toward an outer edge of the lid.   
     
     
         6 . The ventilation device of  claim 1 , wherein
 the drive mechanism is configured to move the lid in a first direction so as to adjust a distance between the lid and the base portion.   
     
     
         7 . The ventilation device of  claim 6 , wherein
 the lid has an opening, and   the drive mechanism is configured to rotate the lid so as to adjust an overlapping area of the opening and the ventilation port.   
     
     
         8 . The ventilation device of  claim 7 , wherein
 the drive mechanism includes
 a drive source and 
 a drive shaft rotationally driven by the drive source, and 
   the drive mechanism is configured to allow the lid to perform a rotating motion in which the lid rotates while the drive shaft rotates and configured to allow the lid to perform a reciprocating motion in which the lid reciprocates in the first direction while the drive shaft rotates.   
     
     
         9 . The ventilation device of  claim 8 , wherein
 the drive mechanism includes
 a rod coupled with one of the drive shaft and the lid and 
 a cam mechanism coupled with the other one of the drive shaft and the lid and having a contact surface which the rod comes into contact with, and 
   the contact surface includes a first transmission portion that transmits a rotational force of the drive shaft to the lid in order to allow the lid to perform the rotating motion and a second transmission portion that transmits the rotational force of the drive shaft to the lid in order to allow the lid to perform the reciprocating motion.   
     
     
         10 . The ventilation device of  claim 9 , further comprising:
 a low-friction portion configured to reduce a friction force between the rod and the contact surface of the cam mechanism.   
     
     
         11 . The ventilation device of  claim 9 , wherein
 the rod includes three or more rods coupled with the drive shaft.   
     
     
         12 . The ventilation device of  claim 7 , wherein
 the drive mechanism is configured to perform
 a first operation to move the lid from a first position to compress the sealing member to a second position more distant from the base portion than the first position, and 
 a second operation to rotate the lid to a predetermined rotational angle while maintaining the lid at the second position after the first operation. 
   
     
     
         13 . The ventilation device of  claim 12 , wherein
 after the second operation, the drive mechanism is configured to perform a third operation to move the lid to the first position while maintaining the lid at the predetermined rotational angle.   
     
     
         14 . The ventilation device of  claim 13 , wherein
 the predetermined rotational angle includes a first rotational angle at which an entire part of the ventilation port is closed by the lid.   
     
     
         15 . The ventilation device of  claim 7 , further comprising:
 a control unit configured to control the drive mechanism to bring a rotational angle of the lid to a set target value.   
     
     
         16 . The ventilation device of  claim 1 , further comprising:
 a refrigerant leakage sensor configured to detect leakage of a refrigerant; and   a control unit configured to control the drive mechanism to turn the lid to a closing position when the refrigerant leakage sensor detects leakage of the refrigerant.