Self-relieving chemical reaction kettle capable of being suitable for microwave working environment

Abstract

The invention discloses a self-relieving chemical reaction kettle capable of being suitable for microwave working environment, belonging to the field of analytical instruments. The self-relieving chemical reaction kettle comprises a sleeve and a sample dissolving cup, and is characterized in that a sealing cover is arranged at the top of the sleeve, an exhaust cavity is arranged inside the sealing cover, a plurality of exhaust holes are formed in the top surface of the sealing cover, a first detachable connecting structure is arranged between the lower end of the sealing cover and the top of the sleeve, a sealing plug with a center pressure guiding hole is arranged at the upper end of the sample dissolving cup, the sealing plug is arranged between the top of the sample dissolving cup and the lower end of the sealing cover, a relieving module is arranged at the upper end of the sealing cover; the relieving module comprises a choke plug, a spring casing, a movable block, a spring and a cap which are sequentially arranged; the choke plug is of an inverted U-shaped structure with an upward opening and an inner cavity, and the spring casing, the movable block, the spring and the cap are sequentially sleeved in the inner cavity of the choke plug. Through arranging the sealing plug and the relieving module, the self-relieving function of a digestion tank is realized; the self-relieving chemical reaction kettle can be widely applied to the fields of design and manufacture of microwave chemical digestion equipment.

Description

technical field [0001] The invention belongs to the field of chemical analysis instruments, in particular to a pressure type chemical reaction kettle suitable for working in the electromagnetic field environment such as microwaves. Background technique [0002] The advancement of science and technology has also led to the development of analytical chemistry, especially the emergence of instruments such as AAS (Atomic Absorption Spectrometry, atomic absorption spectroscopy), HPLC (High Performance Liquid Chromatography, high performance liquid chromatography), which makes sample analysis in sensitivity. Compared with traditional chemical analysis methods, the detection limit is better, and the analysis speed is greatly improved. Such as AAS, it is not a problem to measure 20 or 30 samples in one hour. However, instrumental methods such as AAS and HPLC, like chemical analysis methods, require the sample to be prepared into a solution, which requires digestion of the sample. ...

AI Technical Summary

Problems solved by technology

[0012] But the problem is that no matter which material is used, the sealing cover 12 cannot provide reliable elastic deformation to ensure the stability of the pressure relief point of the digestion tank, especially when the temperature of the digestion tank is different, the mechanical properties of PFA or PTFE change greatly (As shown in Table 1 below), there is no way to guarantee that the digestion tank is at a fixed pressure relief point (that is, a definite pressure relief action value)

[0013] In addition, its taper plug 22 is used as a sealing member. Because its opening is relatively large, it is used as a pressure relief member. When the pressure is released, the reagent in the sample dissolution cup is very easy to follow the removal of the pressure gas, and a large amount of water will be lost. Phenomena that adversely affect the precision and accuracy of the experiment

[0014] At the same time, during the operation of the digestion tank, since the sealing cover 12 needs to be manually rotated and sealed, different people tighten the sealing cover 12 with different strengths, which will inevitably lead to different initial forces (ie, pressure relief values) on the cone plug 22. , this factor will also lead to uncontrollable and unstable pressure relief point of the digestion tank

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