CN204945157U - A kind of full-automatic gas-liquid multi-usage injector - Google Patents

Abstract

The utility model discloses a fully automatic gas-liquid multipurpose sample injector, which includes a pipeline system, the pipeline system includes a connecting pipeline, a sample selection valve is arranged on the connecting pipeline, and a deactivation tee is connected to the sample selection valve. Joint and vent valve; the vent valve is connected with a vacuum pump; the deactivation three-way joint is connected with a deactivation filter and a vent valve; the deactivation filter is connected with a deactivation six-way valve; A device and an analysis instrument; the switching valve is connected with a back pressure valve and a sample flow meter; the pipeline system is connected with a computer control system. The utility model prevents the sample injector from adsorbing the analysis components, and at the same time, various valves of different types are designed to cooperate with each other and switch automatically, so as to ensure that the samples entering the analysis instrument are very representative, and can be used on one sample injector. Realize the sampling analysis of different types of gas and liquid samples. Liquid samples can enter the analytical instrument in liquid form, or enter the analytical instrument after being uniformly vaporized.

Description

A fully automatic gas-liquid multipurpose sampler

technical field

The utility model belongs to the field of instrument analysis, in particular to a fully automatic gas-liquid multipurpose sample injector.

Background technique

Gas (including liquid samples that can be quickly vaporized by heating) sample injectors are usually in the automatic valve sampling mode. Factors such as uniformity are closely related. The most difficult to solve in the analysis is the repeatability of the injection volume, the uniformity of the sample and the cross-contamination between the samples analyzed by the same instrument. For the multi-sample automatic sampler, these problems are more prominent. The more common practice now is that the gas sampler has only one gas inlet or a liquid sample gasifier, only for single-sample analysis, and after the sample is injected, the gas path of the sampler is artificially processed to prevent residual interference. Next sample analysis.

Thirdly, the existing gas sampler has poor sampling representativeness, cannot mix and connect the gas sample source and the liquid sample source, and there is cross-contamination between samples. The effect is poor, and the sample after gasification cannot be guaranteed to be well representative; it is difficult to ensure seamless connection between the sample injector and the analytical instrument to realize sample serialization and automatic sample injection analysis, because it is easy to cause cross-contamination between samples, which directly affects the accuracy of the analysis results sex.

Utility model content

In order to solve the above problems, the utility model provides a fully automatic gas-liquid multipurpose sample injector. The utility model prevents the sample injector from adsorbing the analysis components, and at the same time, various valves of different types are designed to cooperate with each other and switch automatically, so as to ensure that the samples entering the analysis instrument are very representative, and can be used on one sample injector. Realize the injection analysis of different types of gas and liquid samples, coupled with the automatic gas path purification system, avoid cross-contamination between samples during the analysis process, and at the same time prevent the dead volume residual samples from polluting the environment under the action of the vacuum pump.

For reaching above-mentioned technical effect, the technical scheme of the utility model is:

A fully automatic gas-liquid multi-purpose sampler, including a pipeline system, the pipeline system includes a communication pipeline, a sample selection valve is arranged on the communication pipeline, an injection valve and an air outlet valve are arranged on the sample selection valve, The sample valve is connected with a deactivation three-way joint, and the outlet valve is connected with a vent valve; the vent valve is connected with a vacuum pump through the three-way joint A; the deactivation three-way joint is connected with a deactivation filter and a vent valve, and the deactivation filter is connected with a deactivation valve. The active six-way valve and the deactivated six-way valve are provided with a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, and the deactivation filter communicates with the first valve through a needle valve. The first valve communicates with the second valve, the second valve communicates with the fifth valve through the quantitative loop, the fifth valve communicates with the sixth valve, the sixth valve communicates with the first valve, the first valve communicates with the switching valve, and the switching valve The back pressure valve is connected with the three-way joint B, and the three-way joint B is connected with the back pressure valve and the sample flow meter, and the sample flow meter is connected with the three-way joint A; the back pressure valve is provided with a first pressure gauge; the third valve is connected with There is a carrier gas device, the fourth valve is connected with an analytical instrument, the third valve is connected with the fourth valve; the deactivation six-way valve is located in the heating box.

As a further improvement, the first through valve is connected with a purge valve, the purge valve is connected with a purge flowmeter, and the purge valve is provided with a second pressure gauge.

As a further improvement, the fourth valve communicates with multiple analytical instruments through a deactivated multi-position selector valve.

As a further improvement, the heating box is connected with a temperature display.

As a further improvement, there are four sampling valves on the sample selection valve.

As a further improvement, both the inner wall and the outer wall of the pipeline system are coated with silicon coating.

As a further improvement, the pipeline system is connected with a computer control system.

Advantage of the utility model:

1. High degree of automation, able to realize synchronous operation with the instrument.

2. Strong versatility, can analyze air bag samples and steel cylinder samples at the same time.

3. Realized the self-purification function to ensure no cross-contamination between samples.

4. Through the computer control system, it realizes the arbitrary sorting and automatic analysis of multiple samples according to user needs.

5. The computer control system realizes that after closing the sample steel cylinders or air bags, the residual samples in the connecting pipelines of each steel cylinder or air bag are automatically discharged or the samples are emptied according to user needs.

6. Selecting the injection valve realizes the automatic injection analysis of the same sample or different samples on different analytical instruments.

7. The liquid sample in the steel cylinder can be heated and vaporized or injected in liquid form.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

Example

A kind of fully automatic gas-liquid multi-purpose sample injector as shown in Figure 1, comprises pipeline system, is characterized in that, described pipeline system comprises communication pipeline 23, is provided with sample selection valve 1 on the communication pipeline 23, The sample selection valve 1 is provided with 4 sampling valves 24 and 1 outlet valve 25, the sampling valve 24 is connected with the deactivation three-way joint 3, and the gas outlet valve 25 is connected with the vent valve 2; the vent valve 2 is connected with the three-way joint A4 It is connected with a vacuum pump 5; the deactivation three-way joint 3 is connected with a deactivation filter 6 and a vent valve 2, and the deactivation filter 6 is connected with a deactivation six-way valve 8, and the deactivation six-way valve 8 is provided with a first valve 81 , the second valve 82, the third valve 83, the fourth valve 84, the fifth valve 85 and the sixth valve 86, the deactivation filter 6 communicates with the first valve 81 through the needle valve 7, and the first valve 81 communicates with the second valve 82, the second valve 82 communicates with the fifth valve 85 through the quantitative ring 87, the fifth valve 85 communicates with the sixth valve 86, and the sixth valve 86 communicates with the first valve 11. The first through valve 11 communicates with a switching valve 12 and a purge valve 18 , the purge valve 18 communicates with a purge flowmeter 20 , and the purge valve 18 is provided with a second pressure gauge 19 . The switching valve 12 is connected with a back pressure valve 13 and a three-way joint B14, and the three-way joint B14 is connected with a back pressure valve 13 and a sample flow meter 15, and the sample flow meter 15 is connected with the three-way joint A4; A pressure gauge 17; the third valve 83 communicates with the carrier gas device 10, the fourth valve 84 communicates with a plurality of analytical instruments 9 through the deactivated multi-position selector valve 22, and the third valve 83 communicates with the fourth valve 84; the deactivated six The through valve 8 is in the heating box 16, and the heating box 16 is connected with a temperature display 21. The inner and outer walls of the piping system are coated with silicon. The pipeline system is connected with a computer control system.

The operation of the pipeline system is automatically completed by the computer control system through the isolation circuit drive.

The pressure, temperature, and flow of the pipeline system are measured by corresponding detection components, and the signals are converted into computer software by A/D, and the corresponding control signals are fed back by the computer.

The pipeline system is also equipped with combustible gas detection components to prevent leakage and accidents, and at the same time, the signal of the dangerous source can be sent to the end user through computer software.

The synchronous operation signal of the analytical instrument 9 is realized through RS232 serial communication.

When using steel cylinder samples for detection, because steel cylinder samples are generally pressurized liquid samples, when a certain steel cylinder sample is selected, under the control of the computer control system, the sample first discharges part of the dead volume sample through the vent valve 2 and the vacuum pump 5, Then close the vent valve 2, and the sample passes through the deactivation six-way valve 8 in the deactivation filter 6, the needle valve 7, the heating box 16, the quantitative loop 87 in the deactivation six-way valve 8, the switching valve 12, the back pressure valve 13 , the sample flow meter 15 and the vacuum pump 5 perform quantitative replacement, and the length of the vaporization replacement time is determined by specific experiments. After the deactivated six-way valve 8 has injected the sample, the sample selection valve 1 is reset, the vent valve 2 is opened, and the purge valve 18 is opened to purify and purge the pipeline. The purge time is based on the absence of residual samples in the pipeline and cannot affect Next sample analysis.

When testing with the air bag sample introduction: because the air bag sample is generally all low-pressure gas samples, the sample will be sucked into the quantitative loop 87 by the vacuum pump 5 . When the computer control system selects a certain air bag sample, the vent valve 2 is closed during the whole sampling process. Under computer control, the sample passes through the deactivation six-way valve 8 in the deactivation filter 6, the needle valve 7, the heating box 16, the quantitative loop 87 in the deactivation six-way valve 8, the switching valve 12, the sample flow meter 15 and The vacuum pump 5 performs quantitative replacement, and the replacement time is determined by specific experiments. After the deactivated six-way valve 8 has injected the sample, the sample selection valve 1 is reset, and the purge valve 18 is opened to purify and purge the pipeline. The purge time is based on the absence of residual samples in the pipeline and cannot affect the analysis of the next sample.

The sample selection valve 1 in the utility model cooperates with the purge flow meter 20 and the vacuum pump 5, and can communicate with the air bag sample and the steel cylinder sample under pressure. The flow meter 20 purges the communication pipeline 23 to ensure that the sample room will not be polluted by residuals. Because there is a vacuum pump 5, after the sample is analyzed and the sample selection valve 1 is closed, the residual sample in the pipeline can be evacuated to prevent pollution of the connecting pipeline 23 and the surrounding environment of the sampler. Ensure that no sample remains in the injector to avoid contamination of the injector.

When existing sample injectors analyze samples, it is difficult for steel cylinder samples to contain residual liquids such as water, liquid caustic soda, liquid acid, etc., and sometimes insoluble particle pollutants. However, in the present invention, the sample is discharged through the vent valve 2 before analysis, which ensures that the vaporized sample is representative and avoids the blockage of the pipeline of the sampler. The deactivation filter 6 can protect the follow-up gas path clean, and the needle valve 7 controls the gasification rate of the sample to ensure that the sample is gasified evenly and at the same speed as required by the regulations.

When a sample is gasified and injected, under the control of the computer control system, the purging valve 18 is used to provide the purging gas path to the injector, and the purging gas is blown back to the deactivation filter 6 to make it self-purifying for a long time. use. The back pressure valve 13 is used to control the injection volume, so that the test results are repeatable and ensure that the samples entering the instrument are as consistent as possible each time.

Under the control of the computer control system, the sampling mode of the system can be automatically adjusted by controlling the switching valve 12 according to the sample type set by the user. This sampler can also be equipped with a deactivated multi-position selector valve to distribute different samples or the same sample to different analysis instruments according to the user's predetermined program. The automatic gas path purification system in the sampler avoids cross-contamination between samples during the analysis process, and at the same time, under the action of the vacuum pump, it prevents the residue of dead volume samples between the injection cylinder and the selective injection valve, and also avoids When the cylinder or air bag sample is released, the residual sample is released into the surrounding environment of the instrument, which will damage human health and ensure the cleanliness and safety of the analysis. The computer control system can distribute different samples or the same sample to different analysis instruments according to the user's predetermined program by deactivating the multi-position selector valve 22, thereby realizing rapid detection of fast samples.

The utility model can place high-pressure steel cylinder samples and air bag samples in sequence, and can detect both steel cylinder samples and air bag samples, and can automatically switch according to the order, and can automatically purify the experimental pipeline, and one automatic sampler can control multiple Analyze instruments and distribute samples to different instruments.

The description of the above examples is only used to help understand the core idea of the present utility model; meanwhile, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and application range, in summary As stated above, the contents of this specification should not be construed as limiting the present utility model.

Claims (7)

1. A fully automatic gas-liquid multipurpose sampler, including a pipeline system, characterized in that the pipeline system includes a communication pipeline (23), and the communication pipeline (23) is provided with a sample selection valve (1 ), the sample selection valve (1) is provided with an injection valve (24) and an air outlet valve (25), the injection valve (24) is connected with a deactivated three-way joint (3), and the air outlet valve (25) is connected with a vent valve (2); the vent valve (2) is connected to the vacuum pump (5) through the three-way joint A (4); the deactivation three-way joint (3) is connected to the deactivation filter (6) and the vent valve (2), and the deactivation The filter (6) is connected with a deactivation six-way valve (8), and the deactivation six-way valve (8) is provided with a first valve (81), a second valve (82), a third valve (83), a fourth valve Valve (84), fifth valve (85) and sixth valve (86), the deactivation filter (6) communicates with the first valve (81) through the needle valve (7), and the first valve (81) communicates with the second The valve (82) is connected, the second valve (82) is connected with the fifth valve (85) through the quantitative loop (87), the fifth valve (85) is connected with the sixth valve (86), and the sixth valve (86) is connected with the One-way valve (11), the first-way valve (11) is connected with switching valve (12), the switching valve (12) is connected with back pressure valve (13) and three-way joint B (14), three-way joint B (14 ) is connected with a back pressure valve (13) and a sample flow meter (15), and the sample flow meter (15) is connected with the tee joint A (4); the back pressure valve (13) is provided with a first pressure gauge (17); The third valve (83) is connected with the carrier gas device (10), the fourth valve (84) is connected with the analytical instrument (9), the third valve (83) and the fourth valve (84) are connected; the deactivation six-way valve ( 8) In the heating box (16). 2. The fully automatic gas-liquid multi-purpose sampler according to claim 1, characterized in that, the first through valve (11) is connected with a purge valve (18), and the purge valve (18) is connected with a purge valve (18). Sweeping flow meter (20), the second pressure gauge (19) is provided on the purge valve (18). 3. The fully automatic gas-liquid multi-purpose sampler according to claim 1, characterized in that the fourth valve (84) communicates with multiple analytical instruments (9) through a deactivated multi-position selector valve (22) . 4. The fully automatic gas-liquid multipurpose sampler according to claim 1, characterized in that, the heating box (16) is connected with a temperature display (21). 5. The fully automatic gas-liquid multi-purpose sampler according to claim 1, characterized in that, there are four sampling valves (24) on the sample selection valve (1). 6. The fully automatic gas-liquid multi-purpose sampler according to claim 1, wherein the inner and outer walls of the pipeline system are coated with silicon coating. 7. The fully automatic gas-liquid multipurpose sampler according to claim 1, wherein the pipeline system is connected with a computer control system.