Vacuum valve and vacuum circuit breaker

A vacuum valve comprising:

• a first electrode;
• a second electrode;
• a vacuum container having a cylindrical shape and accommodating the first electrode and the second electrode;
• a first flange and a second flange to occlude both end portions of the vacuum container;
• a drive rod to move the first electrode fixed to one end portion of the drive rod in the vacuum container to switch between a closing state and an interrupting state, the drive rod penetrating the first flange and having the one end portion disposed in the vacuum container, the closing state being a state in which the first electrode and the second electrode are in contact with each other, the interrupting state being a state in which the first electrode and the second electrode are not in contact with each other;
• a bellows flange fixed to a side surface of the drive rod;
• a bellows to be extended and contracted when the drive rod switches between the closing state and the interrupting state, the bellows having a concertina tube shape with a plurality of pleats and being bridged between the bellows flange and the first flange;
• and
• a sliding member formed containing a non-porous material, installed on at least one of an inner diameter side and an outer diameter side of the bellows, and being in contact with a plurality of the pleats, wherein one end portion of the sliding member in an axial direction is fixed to the bellows flange.

A vacuum valve comprising:

• a first electrode;
• a second electrode;
• a vacuum container having a cylindrical shape and accommodating the first electrode and the second electrode;
• a first flange and a second flange to occlude both end portions of the vacuum container;
• a drive rod to move the first electrode fixed to one end portion of the drive rod in the vacuum container to switch between a closing state and an interrupting state, the drive rod penetrating the first flange and having the one end portion disposed in the vacuum container, the closing state being a state in which the first electrode and the second electrode are in contact with each other, the interrupting state being a state in which the first electrode and the second electrode are not in contact with each other;
• a bellows flange fixed to a side surface of the drive rod;
• a bellows to be extended and contracted when the drive rod switches between the closing state and the interrupting state, the bellows having a concertina tube shape with a plurality of pleats and being bridged between the bellows flange and the first flange;
• and
• a sliding member formed containing a non-porous material, installed on at least one of an inner diameter side and an outer diameter side of the bellows, and being in contact with a plurality of the pleats, wherein
• the sliding member is installed on both an inner diameter side and an outer diameter side of the bellows, and
• an end portion in an axial direction of the sliding member installed on the inner diameter side of the bellows and the sliding member installed on the outer diameter side of the bellows are fixed to the bellows flange or the first flange.

A vacuum valve comprising:

• a first electrode;
• a second electrode;
• a vacuum container having a cylindrical shape and accommodating the first electrode and the second electrode;
• a first flange and a second flange to occlude both end portions of the vacuum container;
• a drive rod to move the first electrode fixed to one end portion of the drive rod in the vacuum container to switch between a closing state and an interrupting state, the drive rod penetrating the first flange and having the one end portion disposed in the vacuum container, the closing state being a state in which the first electrode and the second electrode are in contact with each other, the interrupting state being a state in which the first electrode and the second electrode are not in contact with each other;
• a bellows flange fixed to a side surface of the drive rod;
• a bellows to be extended and contracted when the drive rod switches between the closing state and the interrupting state, the bellows having a concertina tube shape with a plurality of pleats and being bridged between the bellows flange and the first flange;
• and
• a sliding member formed containing a non-porous material, installed on an inner diameter side of the bellows, and being in contact with a plurality of the pleats, wherein the sliding member is inserted into the bellows without being fixed to any part of the bellows, the first flange, and the bellows flange.