A spiral channel based resistance adjustable standard rod

Abstract

This invention provides a standard rod with adjustable suction resistance based on a spiral channel, comprising an outer tube and an inner rod. The outer tube has a T-shaped stepped hole, with the narrow section of the stepped hole serving as a sealing section and the wide section as a ventilation section. The inner rod has a three-section stepped structure along its length, with a spiral channel built into the narrow section and a row of air inlets connecting to the spiral channel on its surface. The diameter of the middle section of the inner rod is smaller than the inner diameter of the ventilation section of the outer tube, and air inlets are provided around the middle section. A blind hole is provided in the wide section to form an air outlet, and the air inlets connect to the blind hole. The axial position of the inner rod relative to the outer tube is adjustable, changing the number of air inlets exposed in the ventilation section, thus achieving adjustable suction resistance. This solution significantly improves integration and has adjustable suction resistance, while also being more cost-effective and easier to promote and apply.

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