Automatic sampler sampling needle used for strong acidic solution
A technology of automatic sample injection and sampling needle, applied in the direction of instruments, analytical materials, etc., can solve the problems of poor straightness, inability to automatic sampler sampling needle, etc., and achieve the effect of solving straightness and excellent corrosion resistance.
Active Publication Date: 2014-03-19
BEIJING BEIFEN RUILI ANALYTICAL INSTR GROUP
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Problems solved by technology
[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a sampling needle for an autosampler for strong acidic solutions, which solves the problem that although the fluoropolymer pipette has excellent acid corrosion resistance, its straightness is poor , can not be directly used for the problem of autosampler sampling needle
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[0022] like figure 1 As shown, the sampling needle of the autosampler is composed of a pipette 1, a support pipe 2, at least one layer of heat-shrinkable tube 3, a hand-tight joint 4, a sealing ring 5 and a flange 6, etc., wherein the pipette 1 is Fluoropolymer capillary, according to the direction of fluid movement when absorbing the solution, the two ends of the suction pipe 1 are respectively defined as the liquid inlet end and the liquid outlet end, and the support pipe 2 is made of stainless steel or carbon fiber material (or other high rigidity Material), which is sleeved on the suction pipe 1 near the liquid inlet end, the heat shrinkable tube 3 is made of fluoropolymer, and is sleeved on the outside of the support tube 2 layer by layer, and the at least one layer The lengths of both ends of the heat-shrinkable tube 3 exceed the end of the support tube 2 and are thermally fused with the liquid suction tube 1 through heat shrinkage treatment, thereby covering the support...
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Abstract
The invention relates to an automatic sampler sampling needle used for a strong acidic solution. The sampling needle comprises a solution sucking tube, a support tube and at least one heat shrink tube, the solution sucking tube is a fluoropolymer capillary tube, and two ends of the solution sucking tube are defined as a solution inlet end and a solution outlet end respectively; the support tube is sleeved in the position of the solution sucking tube close to the solution inlet end; and the heat shrink tube is made of a fluoropolymer, and is sleeved outside the support tube layer by layer, the lengths of the two ends of the at least one heat shrink tube exceed the end portions of the support tube respectively, and the heat shrink tube and the solution sucking tube are integrated through hot melting. The sampling needle treats the stainless steel support tube or carbon fiber support tube having a good straightness and a good strength as a support, so the good straightness of the sampling needle is guaranteed, and the precise positioning and sampling of the sampling needle are realized. The sampling needle adopts the heat shrink tube made of the fluoropolymer material to thoroughly seal the support tube, so the support tube does not directly contact with the acidic solution to be sucked by the sampling needle in the sampling process, and the support tube cannot be corroded after long-term use.
Description
technical field [0001] The invention relates to an automatic sampler for analytical instruments, in particular to the field of atomic spectrometers for automatically absorbing strong acidic liquids for heavy metal detection, such as sampling needles for automatic samplers for instruments such as atomic fluorescence, atomic absorption and emission spectroscopy. Background technique [0002] The sampling needle of the automatic sampler is generally installed on the mechanical arm of the automatic sampler. Through the vertical downward movement of the mechanical arm, the sampling needle enters the sample cup and contacts the sample solution to achieve the purpose of automatic and accurate quantitative sampling. With the continuous increase of the sample cup position of the automatic sampler, the diameter of the sample cup is also getting smaller and smaller, and the positioning accuracy of the sampling is also getting higher and higher. The positioning accuracy of sampling depe...
Claims
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IPC IPC(8): G01N35/10
Inventor 梁敬王庆董芳
Owner BEIJING BEIFEN RUILI ANALYTICAL INSTR GROUP