Connection seal structure for fluidic device

A connection seal structure for a fluidic device to be used for handling a chemical liquid, the seal structure including a first component made of resin and a second component made of resin, which are connected with each other, the connection seal structure comprising:

• an annular seal component made of resin interposed between a connecting portion of the first component and a connecting portion of the second component, the seal component having end faces formed with a first circumferential protrusion and a second circumferential protrusion;
• a first circumferential groove formed in the connection portion of the first component and a second circumferential groove formed in the connecting portion of the second component;
• the first and second circumferential protrusions each having a base portion that has opposing sides parallel to each other, a width of the base portion being wider than a width of the first and second circumferential grooves, each protrusion including a press-fit allowance in a wall-thickness direction;
• wherein when the connection portion of the first component and the connecting portion of the second component are moved relatively in only an axial direction, the press-fit allowance of the first circumferential protrusion is engaged in the first circumferential groove and the press-fit allowance of the second circumferential protrusion is engaged in the second circumferential groove, such that the first component and the second component are press-fit with the seal component.

A connection seal structure for a fluidic device to be used for handling a chemical liquid, the seal structure including a first component made of resin and a second component made of resin, which are connected with each other, the connection seal structure comprising:

• an annular seal component made of resin interposed between a connecting portion of the first component and a connecting portion of the second component, the seal component having end faces formed with a first circumferential groove and a second circumferential groove, each of the first and second circumferential grooves having an upper portion and a lower portion that has opposing sides parallel to each other, a width of each upper portion being wider than a width of each lower portion;
• a first ridge line formed in the connecting portion of the first component and engaged with a first groove line;
• a second ridge line formed in the connecting portion of the second component and engaged with a second groove line;
• and
• a tapered surface is formed in the first and second ridge lines at a position facing the tapered surfaces of the first and second groove lines, respectively,
• wherein the tapered surface of the first and second ridge lines presses the tapered surfaces of the first and second groove lines in a direction for engagement of the annular wall when the first component and the second component are each connected to the seal component.