Sampling nozzle, automatic analyzer using the same, and method of manufacturing sampling nozzle

摘要

An object of the present invention is to provide a CTS nozzle that reduces the amount of rubber chips generated when a rubber plug is inserted and withdrawn, and further suppresses wear at the tip of the CTS nozzle to withstand repeated use. In the present invention, by providing two cutting surfaces at the tip of the nozzle, the pressure received from the rubber when the nozzle is inserted into the rubber plug is not biased to the one-side cut surface of the nozzle, but is distributed over the two surfaces of the nozzle. Further, the tip side taper portion (second surface) which is one of the two cutting surfaces is curved in a cylindrical circumferential direction at a local position of the nozzle tip and linear with respect to the length direction of the nozzle. It has a curved surface inclined. Therefore, the pressure received by the nozzle is dispersed by the restoring force of the rubber pushed away by the nozzle, and it becomes easy to push the cut rubber while stably suppressing the oblique insertion of the nozzle, and is generated by friction between the cut surface of the nozzle and the rubber. Rubber chips can be reduced. In addition, since the friction with the rubber is reduced, the wear of the nozzle tip can be suppressed and the life of the nozzle can be extended.