Plug unit and connection system for connecting capillary tubes, especially for high-performance liquid chromatography

Abstract

The invention relates to a plug unit 3 for connecting capillary tubes, especially for high-performance liquid chromatography, with a plug capillary tube 10 that projects through a hole of a plug housing 20, wherein the plug housing 20 is constructed so that it can be connected detachably to a bushing unit 5, wherein the front end of the plug capillary tube 10 projects into a capillary tube receptacle opening 53 of the bushing unit 5 when the plug unit 3 and bushing unit 5 are connected, and with its end face essentially aligned opposite a front end of a bushing capillary tube 57 or a bushing capillary tube opening 55 of the bushing unit 5 and the end face of which is butted against, and wherein the plug housing 20 applies a force, with its end face facing the end of the plug capillary tube 10, directly or indirectly on an annular sealing element 40 surrounding the plug capillary tube 10 in the region of the front end of the plug capillary tube 10 when the plug unit 3 and bushing unit 5 are connected such that the front end of the plug capillary tube 10 is sealed through elastic or elastic and plastic deformation of the sealing element 40 against the capillary tube receptacle opening 53 of the bushing unit 5. According to the invention, the end face of the annular sealing element 40 applies a force on a force-receiving region 11 of the front end of the plug capillary tube 10 projecting in the radial direction past the inner diameter of the annular sealing element 40 during assembly and when the plug unit 3 and bushing unit 5 are in the assembled state, wherein, during the assembly process, the plug capillary tube 10 moves, if necessary, with its end face against the end face of the bushing capillary tube 57 or bushing capillary tube opening 55 and is pressed against it in the assembled state.

Dependencies are inferred from the claim text.