Flash sample injector

Abstract

The utility model relates to the technical field of machinery, in particular to a flash sample injector. Comprising an air bag sample injection system, a steel cylinder sample injection system, a sample injection four-way valve, a heating unit, a throttle valve and a mode four-way valve, the output ports are converged and connected to a main pipeline; the other end of the main pipeline is sequentially connected with a heating unit, a throttling valve and a mode four-way valve; according to the flash sample injector disclosed by the utility model, the gas bag sample injection system and the steel cylinder sample injection system are integrated, so that the sample injection of a gas phase sample and a liquefied gas sample can be simultaneously supported, the limitation of single function of a traditional sample injector is broken through, and the universality and the flexibility of equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a flash evaporation sample injector. Background Art

[0002] In the field of gas chromatography, especially when processing liquefied gas samples, the use of flash injectors is a common practice. The fundamental function of a flash injector is to rapidly convert a liquid sample into a gaseous state to meet the injection requirements of gas chromatography. However, existing technologies primarily rely on flash injectors to complete the vaporization and injection of liquefied gas, limiting their functionality to either gas phase or liquefied gas injection. Utility Model Content

[0003] The utility model provides a flash evaporation sample injector, the purpose of which is to realize the injection of both liquefied gas and gas phase.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] The utility model provides a flash sampler, comprising: an air bag sample injection system, a steel bottle sample injection system, a sample injection four-way valve, a heating unit, a throttle valve and a mode four-way valve;

[0006] Several injection four-way valves, with their output ports connected to the main pipeline;

[0007] The other end of the main pipeline is connected to the heating unit, the throttle valve and the mode four-way valve in sequence;

[0008] At least one four-way injection valve is connected to the air bag injection system, and at least one four-way injection valve is connected to the cylinder injection system;

[0009] One way of the mode four-way valve is connected to the chromatographic instrument, and the other way is set as the exhaust pipeline.

[0010] Furthermore, the air bag sampling system includes an air bag, a first sampling control unit and a sampling pump, and the air bag is sequentially connected to the sampling control unit, the sampling pump and the input port of the sampling four-way valve.

[0011] Furthermore, the steel cylinder sampling system includes a steel cylinder and a second sampling control unit; the steel cylinder is connected to the sampling four-way valve through the second sampling control unit.

[0012] Furthermore, the injection four-way valve is connected to a nitrogen control unit, and the nitrogen control unit is connected to a nitrogen source, and the injection four-way valve is controlled by nitrogen.

[0013] Furthermore, a flow meter is provided on the discharge pipe.

[0014] The beneficial effects achieved by the utility model are:

[0015] The utility model discloses a flash sampler, which can support the injection of gas phase samples and liquefied gas samples at the same time by integrating an air bag injection system and a steel cylinder injection system, breaking through the limitation of the single function of traditional samplers and improving the versatility and flexibility of the equipment.

[0016] The utility model provides a flash sampler. After the sample is injected, gas is used to purge residual substances. Nitrogen gas fully purges the passage of the entire instrument, thereby avoiding blockage and damage to the instrument passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the principle of a flash injector;

[0019] In the figure, 1. Air bag sampling system; 11. Air bag; 12. First sampling control unit; 13. Sampling pump; 2. Nitrogen control unit; 3. Sampling four-way valve; 4. Heating unit; 5. Throttle valve; 6. Mode four-way valve; 7. Cylinder sampling system; 71. Cylinder; 72. Second sampling control unit; 8. Flow meter; 9. Chromatographic instrument.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] like Figure 1 As shown, the utility model provides a flash sampler, comprising: an air bag sample injection system 1, a cylinder sample injection system 7, a sample injection four-way valve 3, a heating unit, a throttle valve 5 and a mode four-way valve 6.

[0025] The output ports of several injection four-way valves 3 are connected to the main pipeline.

[0026] The other end of the main pipeline is connected to the heating unit, the throttle valve 5 and the mode four-way valve 6 in sequence.

[0027] At least one injection four-way valve 3 is connected to the gas bag injection system 1, and at least one injection four-way valve 3 is connected to the cylinder injection system 7. By replacing the gas bag or the cylinder, different gas phases or liquefied gases can be introduced into the flash evaporator through the control of the mode four-way valve and the injection four-way valve.

[0028] One way of the mode four-way valve 6 is connected to the chromatographic instrument 9, and the other way is set as a discharge pipeline.

[0029] The throttle valve 5 is used to control the gas flow rate after the sample is vaporized, ensuring that the sample enters the chromatographic column at an appropriate speed, preventing excess or deficiency from affecting the accuracy and reproducibility of the analysis results, and minimizing the random error of each sample as much as possible.

[0030] The air bag sampling system 1 includes an air bag, a first sampling control unit 12 and a sampling pump 13 . The air bag is sequentially connected to the sampling control unit, the sampling pump 13 and the input port of the sampling four-way valve 3 .

[0031] The gas bag is used to store gaseous samples. The first injection control unit 12 is responsible for controlling the release of gas in the gas bag to ensure that the gas sample can be delivered to the injection four-way valve 3 at a stable speed and volume.

[0032] The injection pump 13 provides power to push the gas sample in the air bag through the injection control unit to the injection four-way valve 3, ensuring the continuity of the injection process.

[0033] The mode four-way valve 6 plays a key switching role, directing the processed sample to the chromatographic instrument 9 for analysis, or switching to the exhaust pipeline to remove excess gas, clean the system, or ensure the pressure balance and safety inside the system.

[0034] In the purge mode, nitrogen directly replaces the residual gas in the components inside the flash evaporator. At the same time, the exhaust pipe is also a passage. The flow meter 8 closely monitors the purge situation. This operation requires nitrogen purge pipeline before and after sampling.

[0035] The cylinder sampling system 7 includes a cylinder 71 and a second sampling control unit 72 ; the cylinder 71 is connected to the sampling four-way valve 3 via the second sampling control unit 72 .

[0036] The steel cylinder 71 stores the liquefied gas sample. The liquefied gas is in liquid state under high pressure and needs to be converted into gas state when sampling.

[0037] The second sample injection control unit 72 manages the flow of the liquefied gas in the cylinder 71 and controls the release rate of the sample to ensure that the sample can be smoothly fed into the flash injector.

[0038] The injection four-way valve 3 is connected to the nitrogen control unit 2, and the nitrogen control unit 2 is connected to the nitrogen source, and the injection four-way valve 3 is controlled by the nitrogen.

[0039] Provides clean nitrogen as carrier gas or purge gas to push samples through the system while preventing cross-contamination between samples and keeping the system clean.

[0040] The provision of multiple injection four-way valves 3 allows for alternate processing of samples from different sample sources (air bags or cylinders 71), increasing the flexibility and efficiency of the device. In this embodiment, two injection four-way valves 3 are provided, connecting the air bag injection system 1 and the cylinder injection system 7, respectively.

[0041] The injection four-way valve 3 has four channels, including two separate injection channels, a nitrogen channel and a common outlet channel. The injection four-way valve 3 controls the air bag of each channel separately, and the air bag will be purged through the nitrogen control unit 2 before and after injection.

[0042] The injection four-way valve 3 can direct the sample to the heating unit by switching the path. The heating unit quickly increases the sample temperature, prompting the liquefied gas sample to quickly vaporize to meet the requirements of gas chromatography analysis; the switching control of the mode four-way valve 6 can switch to the discharge path to facilitate cleaning or discharge of unused samples.

[0043] A flow meter 8 is provided on the exhaust pipe. The flow meter 8 provided on the exhaust pipe is used to monitor the flow rate of the exhaust gas, which helps to maintain the stable operation of the system.

[0044] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flash sampler, characterized in that: include: An air bag sampling system (1), a cylinder sampling system (7), a sampling four-way valve (3), a heating unit, a throttle valve (5) and a mode four-way valve (6); Several injection four-way valves (3), the output ports of which are connected to the main pipeline; The other end of the main pipeline is connected to the heating unit, the throttle valve (5) and the mode four-way valve (6) in sequence; At least one four-way injection valve (3) is connected to the air bag injection system (1), and at least one four-way injection valve (3) is connected to the cylinder injection system (7); One way of the mode four-way valve (6) is connected to the chromatographic instrument (9), and the other way is set as a discharge pipeline.

2. A flash sample injector according to claim 1, characterized in that: The air bag sampling system (1) comprises an air bag, a first sampling control unit (12) and a sampling pump (13), and the air bag is sequentially connected to the sampling control unit, the sampling pump (13) and the input port of the sampling four-way valve (3).

3. A flash sample injector according to claim 1, characterized in that: The steel cylinder sampling system (7) comprises a steel cylinder (71) and a second sampling control unit (72); the steel cylinder (71) is connected to the sampling four-way valve (3) via the second sampling control unit (72).

4. A flash sample injector according to claim 1, characterized in that: The injection four-way valve (3) is connected to the nitrogen control unit (2), and the nitrogen control unit (2) is connected to a nitrogen source, and the injection four-way valve (3) is controlled by the nitrogen.

5. A flash sample injector according to claim 1, characterized in that: A flow meter (8) is provided on the discharge pipeline.

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