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Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change

A temperature change, near-zero expansion technology, applied in dynamic spectrometers, trajectory-stabilized spectrometers, mass spectrometers, etc., to achieve the effect of improving dimensional stability and performance

Pending Publication Date: 2021-04-20
天津国科医疗科技发展有限公司
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AI Technical Summary

Problems solved by technology

The difficulty lies in the high-precision and high-stability quadrupole mass analyzer assembly (referred to as the quadrupole assembly)

Method used

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  • Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change
  • Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change

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Embodiment

[0038] For example, given that the geometric dimension D=12 and R=22, it is calculated that r=D / (1.13*2)≈5.31. Then L=R-r-D=4.69.

[0039] If the positioning cylinder 1 and the pole rod 3 adopt alumina ceramics (the coefficient of linear expansion is about 8e -6 / °C), using formula 4, the linear expansion coefficient of the connector can be selected as a2=(a1*R-a3*D) / L=17.05e -6 / °C.

[0040] At this time, the connecting piece 2 can choose materials such as bronze and brass with a linear expansion coefficient of about 17.05. For example, brass has a linear expansion coefficient of about 17.11e in the range of 0-100 °C -6 / °C.

[0041] Using Formula 5, |a4|=|(a1*T*R-a2*T*L-a3*T*D) / (T*r)|=|(a1*R-a2*L-a3* D) / r|=|-0.05e -6 / ℃|≤|3e -6 / °C|. That is, the requirements are met.

[0042] According to the above geometric dimensions and the selection of connecting parts, when the quadrupole product changes from normal temperature 20°C to 50°C (temperature rise 30°C), the change in...

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Abstract

The invention provides an inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change, and particularly provides a quadrupole rod mass analyzer size stability matching design scheme for a mass spectrometer, which can remarkably improve the size temperature stability of an inscribed circle of a quadrupole rod assembly as a key index under the condition of adopting a pole rod made of the same material. And the linear expansion coefficient of the inscribed circle is close to or equal to zero, so that the performance of the quadrupole rod assembly during quality analysis is improved. Compared with the prior art, the invention has the following advantages: a quadrupole rod product with excellent dimensional stability under temperature change can be obtained. The dimensional stability of the quadrupole rod assembly adopting the patent technology is obviously superior to that of a common design, and the dimensional stability of the quadrupole rod under the condition of temperature change can be greatly improved, so that the performance of the quadrupole rod assembly serving as a mass analyzer in a mass spectrometer is improved.

Description

technical field [0001] The invention relates to the technical field of mass analysis instruments, in particular to an inscribed circle near-zero expansion quadrupole that can adapt to temperature changes. Background technique [0002] Liquid chromatography-mass spectrometry equipment is widely used in food, drug analysis and other fields. Among them, in the liquid chromatography tandem single quadrupole mass spectrometry (LC-MS), if the electrospray ionization source is used, there are basically only quasi-molecular ions, little or no fragments, so only the molecular weight information of unknown substances can be given, and cannot Further obtain structural information; if an electron bombardment source (EI source) is used, fragment ions can be generated for simple structural analysis. [0003] Liquid chromatography tandem triple quadrupole mass spectrometry (LC-MS / MS) adopts tandem mass spectrometry, which can obtain both molecular ion peaks and fragment ion peaks, so it c...

Claims

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Application Information

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IPC IPC(8): H01J49/42H01J49/26
Inventor 张远清凌星吴杰张金鑫孙慈晶曹祥宽尚雪松
Owner 天津国科医疗科技发展有限公司
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