Patent ID: 11955323
Assignee: JIANGSU LEUVEN INSTRUMENTS CO. LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A device for blocking plasma backflow in a process chamber to protect an air inlet structure, comprising an air inlet nozzle connected to an air inlet flange, an inner cavity of the air inlet nozzle being provided with an air inlet guide body, wherein
the air inlet guide body has an upper structure, a middle structure, and a lower structure, where the upper structure, the middle structure, and the lower structure are an integrated structure and are in a shape of cylinder, and the upper structure has a cross-sectional diameter smaller than a cross-sectional diameter of the middle structure; and
a gas gathering area is arranged between the middle structure and the lower structure, and the middle structure and the lower structure are connected through the gas gathering area,
wherein at least one blind hole is arranged on an upper surface of the air inlet guide body, wherein the blind hole runs through an upper surface of the upper structure into an interior of the middle structure; and a lower end of the blind hole is in communication with one end of a radial hole;
wherein the radial hole is arranged on an upper-outer surface of the middle structure, and another end of the radial hole is in communication with an edge groove; and
the edge groove is arranged on outer side surfaces of the middle structure and lower structure.