Connector
Provided is a connector which can facilitate tuning of frequency of pulsation to be reduced and prevent sealing performance from degrading when a piston moves. A pulsation reducing member adopts a structure in which the piston moves in a cylinder. The cylinder has an annular flange portion projecting in a radially inner direction of a hollow cylindrical shape. An elastic sealing member is sandwiched in a compressed state between an end surface of the flange portion of the cylinder and an end surface of the piston. An urging body is disposed in a region in the cylinder on a side of the piston opposite to a passage and applies urging force to move the piston toward the passage and compress the elastic sealing member.
1. A connector, comprising:
a housing forming a passage for conveying fluid from one end to the other end thereof, and connecting a first member on a side of the one end with a second member on a side of the other end; and
a pulsation reducing member provided on the housing;
the pulsating reducing member comprising:
a cylinder formed in a hollow cylindrical shape integrally with the housing, having an opening portion on one end side of the hollow cylindrical shape communicating with the passage, and having an annular flange portion projecting in a radially inner direction of the hollow cylindrical shape;
a piston disposed in the cylinder on a side of the flange portion opposite to the passage and movable in the cylinder;
an elastic sealing member sandwiched in a compressed state between an end surface of the flange portion and an end surface of the piston, dividing a region on a side of the piston near the passage from a region on a side of the piston opposite to the passage in the cylinder, and changing in amount of compression in accordance with position of the piston; and
an urging body disposed in the region on the side of the piston opposite to the passage in the cylinder and applying urging force to move the piston toward the passage and compress the elastic sealing member,
wherein the elastic sealing member is formed of a material and shape which enables elastic deformation at least in an amount corresponding to a travel distance of the piston.
2. The connector according to claim 1 , wherein the urging body comprises an elastic member which is any of rubber, a coil spring, a flat spring and elastic resin attached between the other end surface of the piston and a surface on the other end side of the cylinder.
3. The connector according to claim 2 , wherein the cylinder has an opening portion on the other end side of the hollow cylindrical shape, and
the region in the cylinder on the side of the piston opposite to the passage is open to the atmosphere.
4. The connector according to claim 2 , wherein the cylinder has a closed bottom surface on the other end side of the hollow cylindrical shape,
the cylinder, the piston and the elastic sealing member form a sealed chamber in the region in the cylinder on the side of the piston opposite to the passage, and
the urging body comprises gas in the sealed chamber in addition to the elastic member.
5. The connector according to claim 1 , wherein the cylinder has a closed bottom surface on the other end side of the hollow cylindrical shape,
the cylinder, the piston and the elastic sealing member form a sealed chamber in the region in the cylinder on the side of the piston opposite to the passage, and
the urging body is gas in the sealed chamber.
6. The connector according to claim 1 , wherein the elastic sealing member is always sandwiched in a compressed state between an end surface of the flange portion and an end surface of the piston; and
wherein the elastic sealing member always restricts fluid transfer between the region on the side of the piston near the passage and the region on the side of the piston opposite to the passage in the cylinder.