Novel sample injector
By designing a novel sample injector, the problems of discontinuous operation and contamination in the sample injection procedure of portable atomic emission spectrometers were solved, enabling precise control of the injection volume and improving the accuracy and precision of measurement results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING IND POLYTECHNIC COLLEGE
- Filing Date
- 2025-07-17
- Publication Date
- 2026-05-19
AI Technical Summary
The existing portable atomic emission spectrometers have poor consistency in their sample introduction procedures, which can easily lead to solution contamination and inaccurate sample volume, affecting the accuracy and precision of the measurement results.
A novel injector was designed, comprising a first tubing and multiple second tubing, an injection tube with graduated lines and a stopcock valve, to achieve individual injection and precise control of the solution, and to avoid cross-contamination of the solution.
It improves operational smoothness and injection accuracy, avoids solution contamination, and enhances the accuracy and precision of measurement results.
Smart Images
Figure CN224263073U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sample pretreatment technology for spectroscopic analysis instruments, and in particular to a novel sample injector. Background Technology
[0002] Portable atomic emission spectrometers (AES) are small, low-power portable trace hydride atomic emission spectrometers used to detect elements such as Al, Se, Bi, Pb, and Hg. They employ a peristaltic pump to pump an acidified sample solution and sodium or potassium borohydride solution into a continuous-flow hydride generation reaction chamber. Using chemical vapor generation (CVG and HG) methods, the target element is reduced to a volatile analyte with a reducing agent. The gaseous target element hydride, after gas-liquid separation and dehydration filtration, enters a microplasma excitation source unit (μPD) for atomization and dissociation, exciting the target analyte to emit characteristic atomic spectra. These spectral signals are then acquired and converted by a linear charge-coupled device (CCD), and finally, the concentration of the target element in the sample solution is determined through analysis.
[0003] In the current injection procedure, the pump must first be stopped. The tubing is then removed from the storage container containing hydrochloric acid and transferred to a centrifuge tube containing the solution used for standard curve plotting or the sample solution. After the solution in the centrifuge tube is delivered to the tubing system using a peristaltic pump, the pump is stopped again, and the tubing is reinserted into the storage container. The pump is then restarted to allow the hydrochloric acid solution in the storage container to flow into the system, propelling the standard curve determination solution or sample solution in the tubing into the detector, thus completing the entire injection process.
[0004] However, when operating with the existing sample introduction system, the operation is not smooth; air can easily enter during the switching process, affecting the accuracy and precision of the data measurement; there is no cleaning process on the outer wall of the tubing, which can easily cause solution contamination and result in measurement errors; during the sample introduction process, quantification is based on the outer scale of the centrifuge tube, but the centrifuge tube has limited precision and cannot accurately determine the injection volume. Utility Model Content
[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a novel sample injector.
[0006] The present invention adopts the following technical solution.
[0007] A novel sample injector includes a first conduit and a plurality of second conduits. A first connecting tube is vertically connected to the top of the first conduit, and a first sample injection tube is disposed above the first connecting tube. A second connecting tube is vertically connected to the top of each second conduit, and a second sample injection tube is disposed above each second connecting tube.
[0008] To more accurately measure the injection volume of the standard curve determination solution and the sample solution, both the first and second injection tubes are equipped with graduation lines.
[0009] To further improve operational smoothness, a first stopcock valve is connected to the bottom of the first injection tube, and the first stopcock valve is connected to the first connecting tube. A third stopcock valve is connected to one end of the first tube, and a hydrochloric acid tube is connected to the side of the third stopcock valve away from the first tube.
[0010] Preferably, a second stopcock valve is connected to the bottom of each second injection tube, and the second stopcock valve is connected to the second connecting tube.
[0011] Preferably, the first pipeline and the second pipeline are connected by a hose, and the second pipeline is located at the end of the first pipeline away from the third stop valve. The second pipelines are also connected by hoses.
[0012] To improve the stability of the first and second pipelines during placement, a first base and a second base are respectively connected to the bottom of the first and second pipelines.
[0013] Preferably, the inner diameters of the first, second, and third plug valves are the same.
[0014] Preferably, the inner and outer diameters of the first and second pipes are the same.
[0015] Beneficial effects: By setting up a first injection tube, a second injection tube, a first tubing, and multiple second tubing, the smoothness of operation is improved, and the ingress of air during pump start-up and shutdown can be avoided, thus preventing interference with the results. The standard curve determination solution, sample solution, and hydrochloric acid solution all have separate injection methods, eliminating cross-contamination and preventing solution contamination that could affect the results. The injection accuracy measurement is the same as that of precision measuring instruments such as pipettes, allowing for strict control of the injection volume and improving the accuracy and precision of the measurement results. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a three-dimensional structural diagram of the novel sample injector of this utility model.
[0018] Figure 2 This is a front view of the novel sampler of this utility model.
[0019] Figure 3 This is a three-dimensional structural diagram of the first conduit of the novel sampler of this utility model.
[0020] Figure 4 This is a three-dimensional structural diagram of the first conduit of the novel sampler of this utility model.
[0021] 1-First pipeline, 2-Second pipeline, 3-First injection tube, 4-Second injection tube, 5-Scale line, 6-First stopcock valve, 7-Second stopcock valve, 8-Third stopcock valve, 9-Hydrochloric acid pipeline, 10-Hose, 11-First base, 12-Second base, 13-First connecting tube, 14-Second connecting tube. Detailed Implementation
[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0023] Combination Figures 1-4 As shown, a novel sample injector includes a first conduit 1 and a plurality of second conduits 2. A first connecting tube 13 is vertically connected above the first conduit 1, and a first sample injection tube 3 is disposed above the first connecting tube 13. A second connecting tube 14 is vertically connected above each of the second conduits 2, and a second sample injection tube 4 is disposed above each of the second connecting tubes 14.
[0024] The surfaces of the first injection tube 3 and the second injection tube 4 are both provided with scale lines 5.
[0025] The first injection tube 3 is connected to a first stopcock valve 6 below it, and the first stopcock valve 6 is connected to the first connecting tube 13. One end of the first pipeline 1 is connected to a third stopcock valve 8, and the side of the third stopcock valve 8 away from the first pipeline 1 is connected to a hydrochloric acid pipeline 9.
[0026] Each of the second injection tubes 4 is connected to a second stopcock valve 7 at its lower end, and the second stopcock valve 7 is connected to the second connecting tube 14.
[0027] The first pipeline 1 and the second pipeline 2 are connected by a hose 10, and the second pipeline 2 is located at the end of the first pipeline 1 away from the third stop valve 8. The second pipelines 2 are also connected by hoses 10.
[0028] The first base 11 and the second base 12 are respectively connected to the bottom of the first pipe 1 and the second pipe 2.
[0029] Among them, the inner diameter of the valve bore of the first plug valve 6, the second plug valve 7, and the third plug valve 8 is the same.
[0030] Among them, the inner diameter and outer diameter of the first pipe 1 and the second pipe 2 are the same.
[0031] In use, the end of the first tubing 1 closest to the third stopcock valve 8 is connected to the hydrochloric acid solution, and the end of the second tubing 2 is connected to the peristaltic pump of the external portable atomic emission spectrometer. The first injection tube 3 and the four second injection tubes 4 closest to the third stopcock valve 8 are used to inject the solution for standard curve determination, while the two second injection tubes 4 furthest from the third stopcock valve 8 are used to inject the sample solution. Therefore, the standard curve determination solution, sample solution, and hydrochloric acid solution all have separate injection methods, eliminating cross-injection and avoiding the influence of solution contamination on the measurement results. Simultaneously, the precision of the graduation lines 5 on the surface of the first injection tube 3 and the second injection tubes 4 is the same as that of the pipette, allowing for strict control of the injection volume and improving the accuracy and precision of the measurement results. Opening the first stopcock valve 6 allows the solution in the first injection tube 3 to flow into the first pipeline 1 and the second pipeline 2 for injection. Closing the first stopcock valve 6 stops the injection. Opening the second stopcock valve 7 allows the solution in the second injection tube 4 to flow into the second pipeline 2 for injection. Closing the second stopcock valve 7 stops the injection. Opening the third stopcock valve 8 allows hydrochloric acid solution to flow into the first pipeline 1 and the second pipeline 2. Closing the third stopcock valve 8 stops the flow of hydrochloric acid solution. This improves the smoothness of operation and avoids the impact of gas intake due to pump start-stop operations on the measurement results. The entire injection process does not require switching pipelines, ensuring that the solution is not contaminated and the measurement results are more accurate.
[0032] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.
Claims
1. A novel sample injector, characterized in that: It includes a first pipeline (1) and multiple second pipelines (2). A first connecting pipe (13) is vertically connected above the first pipeline (1), and a first injection pipe (3) is provided above the first connecting pipe (13). A second connecting pipe (14) is vertically connected above each second pipeline (2), and a second injection pipe (4) is provided above each second connecting pipe (14).
2. The novel sample injector as described in claim 1, characterized in that: Both the first injection tube (3) and the second injection tube (4) have scale lines (5) on their surfaces.
3. The novel sample injector as described in claim 1, characterized in that: A first stopcock valve (6) is connected below the first injection tube (3), and the first stopcock valve (6) is connected to the first connecting tube (13). A third stopcock valve (8) is connected to one end of the first pipeline (1), and a hydrochloric acid pipeline (9) is connected to the side of the third stopcock valve (8) away from the first pipeline (1).
4. The novel sample injector as described in claim 1, characterized in that: Each second injection tube (4) is connected to a second stopcock valve (7) at its bottom, and the second stopcock valve (7) is connected to the second connecting tube (14).
5. The novel sample injector as described in claim 3, characterized in that: The first pipeline (1) and the second pipeline (2) are connected by a hose (10), and the second pipeline (2) is located at the end of the first pipeline (1) away from the third stop valve (8). The second pipelines (2) are also connected by hoses (10).
6. The novel sample injector as described in claim 1, characterized in that: The first base (11) and the second base (12) are respectively connected to the bottom of the first pipe (1) and the second pipe (2).
7. The novel sample injector as described in any one of claims 3-4, characterized in that: The valve inner diameters of the first plug valve (6), the second plug valve (7), and the third plug valve (8) are the same.
8. The novel sample injector as described in claim 1, characterized in that: The inner and outer diameters of the first pipe (1) and the second pipe (2) are the same.