Shielding case for ion source housing

A mass spectrometer and/or mobility spectrometer comprising: an ion source housing for housing an ion source; a vacuum chamber; a pumping block located between the ion source housing and the vacuum chamber; the shielding case is used for protecting the surface of the ion source shell; wherein the shield has a first portion configured to be mounted to an upstream side of the pumping block so as to secure the shield at a position where a second portion of the shield covers an inner surface of the ion source housing. 一种质谱仪和/或迁移谱仪，其包括：离子源外壳，该离子源外壳用于容纳离子源；真空室；泵送块，该泵送块位于该离子源外壳与该真空室之间；和屏蔽罩，该屏蔽罩用于保护该离子源外壳的表面；其中该屏蔽罩具有第一部分，该第一部分被配置成安装到该泵送块的上游侧，以便将该屏蔽罩固定在该屏蔽罩的第二部分覆盖该离子源外壳的内表面的位置处。