Automatic standard solution adding device for adsorption pipe

Abstract

The utility model relates to the field of standard liquid adding devices, in particular to an automatic standard liquid adding device for an adsorption tube, which comprises a round-bottom standard liquid bottle, the device further comprises a double-hole standard liquid bottle sealing cover, a high-frequency switch electromagnetic valve, an electromagnetic valve mounting block, a flow controller, a pressure controller, an adsorption pipe and a first connector body. The three round-bottom standard liquid bottles are arranged, different standard liquids or internal standard substances can be stored at the same time, multi-channel independent control is achieved through the high-frequency switch electromagnetic valves (larger than or equal to three) integrated with the electromagnetic valve installation blocks, the requirement for synchronous adding of internal standards and external standards in an internal standard method is met, additional operation steps are reduced, and the cost is reduced. The problems that an existing automatic standard solution adding device cannot be integrated on a thermal desorption instrument to automatically add a liquid standard sample to an adsorption tube, the standard solution gradient is difficult to generate, and low-boiling-point substances are prone to loss are solved, the automatic standard solution adding device is suitable for environmental standards needing internal standard method detection, and the standard curve manufacturing efficiency and the detection accuracy can be remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the field of standard liquid adding devices, and in particular relates to an automatic standard liquid adding device for an adsorption tube. Background Art

[0002] The thermal desorber can heat and decompose the low-concentration gas samples collected in the adsorption tube, and then enter the gas chromatography or mass spectrometry for analysis. Now as an essential instrument for many environmental testing standards, the primary task of the thermal desorber during use is to create a standard curve.

[0003] Most of the current operating methods are to manually dilute the liquid standard sample into at least 5 gradients, and then use a micro-syringe to add different concentrations of standard solutions to the adsorption tube, and use inert gas to purge the adsorption tube sample with the required concentration to make the curve. Some standards (such as HJ734-2014) stipulate that the internal standard method should be used for quantitative detection, so the collected adsorption tube samples must be added with internal standards before analysis. This operation is time-consuming and labor-intensive, and the addition process may also cause the loss of low-boiling point substances. The existing automatic standard solution addition device cannot be integrated on the thermal desorber to automatically add liquid standards to the adsorption tube, and the standard solution gradient is difficult to generate, and low-boiling point substances are easily lost.

[0004] Therefore, an automatic standard liquid adding device for adsorption tubes is proposed, which can be integrated on a thermal desorber to automatically add liquid standard samples to the adsorption tubes. The standard liquid gradient is easy to generate and low-boiling point substances are not easily lost. Utility Model Content

[0005] In order to overcome the problems that the existing automatic standard solution adding device cannot be integrated on the thermal desorber to automatically add liquid standard to the adsorption tube, the standard solution gradient is difficult to generate, and the low-boiling point substance is easy to lose, an automatic standard solution adding device for the adsorption tube is proposed.

[0006] The technical scheme of the utility model is: an automatic standard liquid adding device for an adsorption tube, comprising a round bottom standard liquid bottle; also comprising a double-hole standard liquid bottle sealing cover, a high-frequency switch solenoid valve, a solenoid valve mounting block, a flow controller, a pressure controller, an adsorption tube and a first joint body;

[0007] There are three round-bottom standard liquid bottles, the openings of which face the high-frequency switch solenoid valve, and the inner wall of the opening is provided with a double-hole standard liquid bottle sealing cover, which seals the round-bottom standard liquid bottle and is provided with two holes, and the inner walls of the two holes are both fixedly connected with first joint bodies, one end of the pressurized pipeline is fixedly connected to the inner wall of one of the first joint bodies, and the inner wall of the other first joint body is used to insert one end of the standard liquid output pipeline into the standard liquid at the bottom of the bottle in the round-bottom standard liquid bottle;

[0008] The gas supply port of the pressure controller is connected to the other end of the pressurized pipeline to control the pressure in the round-bottom standard liquid bottle;

[0009] The other end of the standard liquid output pipeline is connected to the air inlet port of the high-frequency switch solenoid valve, and the lower end of the high-frequency switch solenoid valve is fixedly connected with a solenoid valve mounting block;

[0010] The flow controller is connected to the solenoid valve mounting block through a standard liquid purge pipeline, and the pipeline passes through the gas outlet port of the high-frequency switching solenoid valve and is finally connected to the gas inlet port of the adsorption tube.

[0011] Preferably, the air inlet port of the high-frequency switch solenoid valve is provided with a second connector body, and the second connector body and the other end of the standard liquid output pipeline are detachably connected.

[0012] Preferably, a third joint body is provided on the solenoid valve mounting block, and the third joint body is connected to the standard liquid purge pipeline on the flow controller.

[0013] Preferably, a fourth joint body is provided on the solenoid valve mounting block, and the fourth joint body is connected to a standard liquid purge pipeline on the adsorption tube.

[0014] Preferably, the air inlet port of the solenoid valve mounting block is divided into three, and the three second connector bodies are arranged in rows and at equal distances.

[0015] Preferably, the adsorption tube is of detachable design and is connected to the flow controller via a quick connector.

[0016] Preferably, a leak-proof sealing ring is provided inside the solenoid valve mounting block.

[0017] Beneficial effects of the utility model:

[0018] 1. The linkage control of high-frequency switch solenoid valve, pressure controller and flow controller can automatically complete the processes of pressurizing, outputting and purging the standard solution, replacing tedious operations such as manual dilution and injection, and significantly improving efficiency. The high-frequency switch solenoid valve can directly adjust the output volume of the standard solution by accurately controlling the switch time and frequency (for example, calculating the total addition amount by the number of pulses and the single flow rate), realizing the rapid generation of different concentration gradients (such as the 5 gradients required by the HJ734-2014 standard), and avoiding manual dilution errors;

[0019] 2. This solution has the ability to process multiple standard solutions simultaneously. By setting up three round-bottom standard solution bottles, different standard solutions or internal standard substances can be stored at the same time. The high-frequency switching solenoid valves (≥3) integrated in the solenoid valve mounting block can realize multi-channel independent control, which meets the requirements of simultaneous addition of internal and external standards in the internal standard method (such as HJ734-2014), reduces additional operation steps, and solves the problems that the existing automatic standard solution addition device cannot be integrated on the thermal desorber to automatically add liquid standards to the adsorption tube, the standard solution gradient is difficult to generate, and low-boiling point substances are easy to lose. It is especially suitable for environmental standards that require internal standard method detection (such as HJ734-2014), and can significantly improve experimental efficiency and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 What is shown is a structural diagram of an automatic standard liquid adding device for an adsorption tube of the utility model;

[0021] Figure 2 What is shown is a three-dimensional structural schematic diagram of a high-frequency switch solenoid valve of an automatic standard liquid adding device for an adsorption tube of the utility model.

[0022] The markings in the attached drawings are: 1. round-bottom standard liquid bottle; 2. double-hole standard liquid bottle sealing cover; 3. high-frequency switching solenoid valve; 4. solenoid valve mounting block; 5. flow controller; 6. pressure controller; 7. adsorption tube; 8. first joint body; 9. second joint body; 10. third joint body; 11. fourth joint body. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment 1: The utility model provides an embodiment: Please refer to Figure 1 and Figure 2 In this embodiment, an automatic standard liquid adding device for an adsorption tube includes a round bottom standard liquid bottle 1; characterized in that it also includes a double-hole standard liquid bottle sealing cover 2, a high-frequency switch solenoid valve 3, a solenoid valve mounting block 4, a flow controller 5, a pressure controller 6, an adsorption tube 7 and a first joint body 8;

[0025] There are three round-bottom standard liquid bottles 1, the openings of which face the high-frequency switch solenoid valve 3, and the inner wall of the openings is provided with a double-hole standard liquid bottle sealing cover 2, which seals the round-bottom standard liquid bottle 1 and is provided with two holes, and the inner walls of the two holes are both fixedly connected with a first joint body 8, wherein the inner wall of one of the first joint bodies 8 is fixedly connected with one end of a pressurized pipeline, and the inner wall of the other first joint body 8 is used to insert one end of a standard liquid output pipeline into the standard liquid at the bottom of the bottle in the round-bottom standard liquid bottle 1;

[0026] The gas supply port of the pressure controller 6 is connected to the other end of the pressurized pipeline to control the pressure in the round-bottom standard liquid bottle 1;

[0027] The other end of the standard liquid output pipeline is connected to the air inlet port of the high-frequency switch solenoid valve 3, and the lower end of the high-frequency switch solenoid valve 3 is fixedly connected with a solenoid valve mounting block 4;

[0028] The flow controller 5 is connected to the solenoid valve mounting block 4 through a standard liquid purge pipeline, and the pipeline passes through the air outlet port of the high-frequency switch solenoid valve 3 and is finally connected to the air inlet port of the adsorption tube 7.

[0029] The parallel design of the three round-bottom standard liquid bottles 1 enables simultaneous filling of multiple standard liquids, increasing the processing efficiency by 3 times; the dual-channel isolation structure of the double-hole standard liquid bottle sealing cover 2 prevents cross-contamination of gas and liquid, and the coordinated control of the pressure controller 6 and the flow controller 5 enables higher accuracy in standard liquid filling.

[0030] See also Figure 1 and Figure 2 In this embodiment, the air inlet port of the high-frequency switch solenoid valve 3 is provided with a second connector body 9, and the second connector body 9 and the other end of the standard liquid output pipeline are detachably connected to facilitate maintenance and replacement.

[0031] See also Figure 1 and Figure 2 In this embodiment, a third joint body 10 is provided on the solenoid valve mounting block 4, and the third joint body 10 is connected to the standard liquid purge pipeline on the flow controller 5. The third joint body 10 is conveniently connected to the standard liquid purge pipeline on the flow controller 5.

[0032] See also Figure 1 and Figure 2 In this embodiment, a fourth joint body 11 is provided on the solenoid valve mounting block 4, and the fourth joint body 11 is connected to the standard liquid purge pipeline on the adsorption tube 7 for easy connection.

[0033] See also Figure 1 and Figure 2 In this embodiment, the air inlet port of the solenoid valve mounting block 4 is divided into three, and the three second connector bodies 9 are arranged in a row and equidistantly, so as to facilitate the addition of three standard solutions with different concentrations.

[0034] See also Figure 1 and Figure 2 In this embodiment, the adsorption tube 7 is of detachable design and is connected to the flow controller 5 through a quick connector. The adsorption tube 7 can be quickly disassembled and assembled, and is easy to use.

[0035] See also Figure 1 and Figure 2 In this embodiment, a leakproof sealing ring is provided inside the solenoid valve mounting block 4. The leakproof sealing ring is made of fluororubber and has a temperature resistance range of -20°C to 150°C, thereby extending the sealing life.

[0036] Working principle: First, three standard solutions of different concentrations, such as internal standard solution, external standard solution and diluent, are respectively placed into three round-bottom standard solution bottles 1, and sealed with double-hole standard solution bottle sealing caps 2. The two holes of the double-hole standard solution bottle sealing caps 2 are respectively connected to two pipelines:

[0037] Pressurized pipeline: one end is inserted into the double-hole standard liquid bottle sealing cap 2 but does not touch the standard liquid surface, and the other end is connected to the gas supply port of the pressure controller 6;

[0038] Standard solution output pipeline: one end is inserted into the standard solution at the bottom of the bottle, and the other end is connected to the air inlet port of the high-frequency switch solenoid valve 3;

[0039] The pressure controller 6 inputs gas such as nitrogen into the round-bottom standard liquid bottle 1, and the pressure is adjusted to 0.1-0.5MPa, so as to push the standard liquid to flow to the high-frequency switch solenoid valve 3 through the standard liquid output pipeline. The high-frequency switch solenoid valve 3 controls the switch time, such as the pulse frequency of 0.1-10Hz, to accurately adjust the output volume of the standard liquid, such as a single pulse output of 1μL, to achieve the addition of different volumes of standard liquid;

[0040] After the standard liquid enters the cavity of the solenoid valve mounting block 4 through the high-frequency switch solenoid valve 3, the flow controller 5 is started to introduce an inert gas such as nitrogen at a flow rate of 10-200 mL / min to purge the standard liquid into the adsorption tube 7. The purge continues until there is no residual standard liquid in the solenoid valve mounting block 4, and the flow stability is determined by monitoring the flow controller;

[0041] The switching times of the high-frequency switch electromagnetic valve 3‌ are controlled by a preset program, for example, 5 pulses are used to generate 5 μL of standard solution, and combined with the switching of multiple standard solution bottles such as internal standard + external standard mixing, samples of the adsorption tube 7 with different concentration gradients are automatically prepared;

[0042] For example, the five gradients required by the HJ734-2014 standard can be quickly achieved by adjusting the output ratio of different standard solution bottles without manual dilution;

[0043] The adsorption tube 7 to which the standard solution has been added is disassembled, and a new tube is replaced and the above process is repeated to achieve batch processing.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An automatic standard liquid adding device for an adsorption tube, comprising a round bottom standard liquid bottle (1); characterized in that: It also includes a double-hole standard liquid bottle sealing cover (2), a high-frequency switch electromagnetic valve (3), an electromagnetic valve mounting block (4), a flow controller (5), a pressure controller (6), an adsorption tube (7) and a first joint body (8); There are three round-bottom standard liquid bottles (1), the openings of which face the high-frequency switch solenoid valve (3), and the inner wall of the openings is provided with a double-hole standard liquid bottle sealing cover (2), which seals the round-bottom standard liquid bottle (1) and is provided with two holes, and the inner walls of the two holes are both fixedly connected to first joint bodies (8), wherein the inner wall of one of the first joint bodies (8) is fixedly connected to one end of a pressurized pipeline, and the inner wall of the other first joint body (8) is used to insert one end of a standard liquid output pipeline into the standard liquid at the bottom of the round-bottom standard liquid bottle (1); The gas supply port of the pressure controller (6) is connected to the other end of the pressurized pipeline, and is used to control the pressure in the round-bottom standard liquid bottle (1); The other end of the standard liquid output pipeline is connected to the air inlet port of the high-frequency switch solenoid valve (3), and the lower end of the high-frequency switch solenoid valve (3) is fixedly connected to a solenoid valve mounting block (4); The flow controller (5) is connected to the solenoid valve mounting block (4) via a standard liquid purge pipeline, and the pipeline passes through the outlet port of the high-frequency switch solenoid valve (3) and is finally connected to the inlet port of the adsorption tube (7).

2. The automatic standard solution adding device for adsorption tube according to claim 1, characterized in that: The air inlet port of the high-frequency switch solenoid valve (3) is provided with a second joint body (9), and the second joint body (9) and the other end of the standard liquid output pipeline are detachably connected.

3. The automatic standard solution adding device for adsorption tube according to claim 1, characterized in that: A third joint body (10) is provided on the solenoid valve mounting block (4), and the third joint body (10) is connected to a standard liquid purge pipeline on the flow controller (5).

4. The automatic standard solution adding device for adsorption tube according to claim 1, characterized in that: A fourth joint body (11) is provided on the solenoid valve mounting block (4), and the fourth joint body (11) is connected to a standard liquid purge pipeline on the adsorption tube (7).

5. The automatic standard solution adding device for adsorption tube according to claim 2, characterized in that: The solenoid valve mounting block (4) has three air inlet ports, and the three second connector bodies (9) are arranged in a row and at equal distances.

6. The automatic standard solution adding device for adsorption tube according to claim 1, characterized in that: The adsorption tube (7) is of detachable design and is connected to the flow controller (5) via a quick connector.

7. The automatic standard solution adding device for adsorption tube according to claim 1, characterized in that: A leak-proof sealing ring is provided inside the solenoid valve mounting block (4).

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