CN211159834U - Liquid standard substance siphon bottle and preparation system - Google Patents
Liquid standard substance siphon bottle and preparation system Download PDFInfo
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- CN211159834U CN211159834U CN201922069223.4U CN201922069223U CN211159834U CN 211159834 U CN211159834 U CN 211159834U CN 201922069223 U CN201922069223 U CN 201922069223U CN 211159834 U CN211159834 U CN 211159834U
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Abstract
The utility model relates to a liquid standard substance siphon bottle and preparation system. The siphon bottle for the liquid standard substance comprises a gas bottle and a bottle valve with a liquid phase inlet and a liquid phase outlet and a gas phase inlet and a gas phase outlet; the liquid phase inlet and outlet extend into the gas cylinder through a communication pipe and are communicated with a flexible expandable and contractible container in the gas cylinder, and the liquid standard substance is stored in the flexible container after being vacuumized; the gas inlet and outlet are communicated with a space between the gas cylinder and the flexible container, and inert gas is introduced into the space to ensure that the liquid standard substance in the flexible container keeps a single liquid phase in the use process, so that more standard substances can be contained in the gas cylinder under the same volume and can be effectively utilized; by selecting the material of the flexible container and artificially introducing a certain amount of liquid standard substance target components into the space between the gas cylinder and the flexible container, the diffusion of the standard substance in the flexible container to the external space is reduced, so that the stability and the accuracy of the standard substance during long-term use are improved.
Description
Technical Field
The utility model belongs to the standard prepares the field, concretely relates to liquid standard substance siphon bottle and preparation system.
Background
The standard substance is widely applied in the field of analysis, and plays an indispensable important role in aspects such as instrument verification and calibration, analytical test method evaluation, atmospheric environmental pollution monitoring, medical health and clinical test, and the like.
In some specific fields, such as oil and gas, the standard substances required are often mixed hydrocarbons. If the mixed hydrocarbon is prepared into standard gas, the boiling point of most hydrocarbons is lower, so the pressure can be reduced if the gas state is kept, so that the actual content is not large under the condition of the same volume of the gas cylinder, the gas cylinder needs to be replaced frequently, and certain trouble is caused for scientific research of production. In order to prepare the mixed hydrocarbon liquid standard substance into a liquid state, a person skilled in the art adopts a mode of pressurizing a gas cylinder, introducing inert gas into the gas cylinder to liquefy the mixed hydrocarbon, and discharging the liquid from the gas cylinder by an inert gas overpressure headspace mode. However, the above approach has the following disadvantages: 1. gas-liquid equilibrium exists between the gas phase and the liquid phase, even inert gas can be dissolved in the liquid phase in a small amount, and similarly, volatile components in the liquid phase can be partially stored in the gas phase; 2. with the continuous reduction of liquid in the use process, the gas phase space is increased, so that more liquid components are volatilized to reach balance, and therefore, the content of the standard substance at the outlet of the same bottle of standard substance is continuously changed actually in the use process, which brings great inaccuracy to analysis and test work.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at: aiming at the existing problems, the liquid standard substance siphon bottle and the liquid standard substance preparation system formed by combining the siphon bottle are provided, the liquid standard substance in the conventional state can be prepared into the liquid state, so that the defect of low utilization rate of the conventional standard substance is overcome, and the component stability of the standard substance in the use process is improved under the condition of not introducing other inert components.
The utility model discloses a following technical scheme:
a siphon bottle for liquid standard substances comprises a gas bottle and at least one bottle valve, wherein the bottle valve is provided with a liquid phase inlet and a gas phase inlet which are not communicated with each other and can be controlled; the liquid phase inlet and outlet extend into the gas cylinder through a communicating pipe to be communicated with a flexible container, and the liquid standard substance is stored in the flexible container; the gas inlet and outlet are communicated with the space between the gas cylinder and the flexible container, and inert gas is introduced into the space.
Furthermore, for convenient installation and operation, the cylinder valve is one, the cylinder valve is a double-head double-valve-core valve, and two valve paths are respectively a liquid-phase inlet and a gas-phase outlet.
Further, the liquid phase inlet and outlet are also connected with a vaporizing device. The vaporizing device is a miniature vaporizer or a vaporizing valve. The vaporizing valve comprises a valve body and a heating device which is fixedly wrapped outside the valve body. The liquid standard substance is usually used in connection with a chromatograph, and the liquid is not suitable for direct sample injection during gas chromatographic analysis, so that the standard substance can be vaporized by a vaporizing device and then enters the chromatograph for analysis.
Furthermore, the flexible container can be made of a material which is excellent in corrosion resistance and adsorption resistance, low in gas permeability, resistant to pressure and capable of shrinking and expanding. For the reutilization of the bottle body, the excellent adsorption resistance is favorable for extracting residual components used in the bottle body for the previous time, and the accuracy of the target is improved when the gas targets with different components are filled. Although the material is hermetically sealed, permeation and exchange of gas inside and outside the flexible container can occur during long-term use, so that the selection of the material with low gas permeability is beneficial to maintaining the stability of the target. The material can be Teflon FEP, polyvinylidene fluoride film, polychlorotrifluoroethylene and other materials which are selected from the preparation materials of the high-performance gas sampling bag in the market at present.
Further, the gas inlet and outlet are connected with a pressure gauge for measuring the pressure of the inert gas so as to ensure that the pressure is always greater than the vapor pressure of the standard substance.
Further, a certain amount of target components in the liquid standard substance can be introduced into the space between the gas cylinder and the flexible container. Artificially adding the target component, reducing osmotic pressure between the space and the flexible container, and reducing content deviation caused by permeation of the standard substance in the flexible container to the external space in a longer time use process.
Furthermore, the communicating pipe is a metal pipe, and the metal pipe extends into the flexible container and is close to the bottom of the flexible container, so that all internal targets can be conveniently discharged.
A liquid standard substance preparation system comprises the liquid standard substance siphon bottle, a vacuum pumping system and an inert gas source, wherein the vacuum pumping system is respectively communicated with a liquid phase inlet and a liquid phase outlet and a gas phase inlet and outlet, and the inert gas source is communicated with the gas phase inlet and outlet.
Furthermore, the vacuum pumping system is a molecular pump with a switching pipeline or a pump combination of the molecular pump and a mechanical pump. The molecular pump is selected to be beneficial to the reduction of the vacuum limit, and a mechanical pump is added to pre-pump the pipeline, so that the molecular pump can be protected.
Since the proposal is adopted, the utility model discloses following beneficial effect has:
1. the utility model arranges a flexible container in the gas cylinder, and places the liquid standard substance in the flexible container, the space between the flexible container and the gas cylinder is filled with inert gas with certain pressure, the liquid standard substance in the flexible container is changed into liquid state by pressurizing the gas cylinder, and the standard substance which can be contained in the gas cylinder with the same volume is more and can be effectively utilized;
2. the material of the flexible container is selected, and a certain amount of liquid standard substance is artificially introduced into the space between the gas cylinder and the flexible container, so that the diffusion of the standard substance in the flexible container to the external space is reduced, and the stability and the accuracy of the standard substance during long-time use are improved;
3. the vaporizing valve is arranged to vaporize the discharged standard substances, so that the discharged standard substances can directly enter chromatographic analysis, and subsequent analysis and quantitative operation are facilitated.
Drawings
In order to more clearly illustrate the technical solution of the mode of the invention, the drawings that are required to be used in the embodiment are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the invention, and are not to be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a liquid standard substance siphon bottle of the present invention;
FIG. 2 is a schematic diagram of a liquid standard substance preparation system of the present invention;
FIG. 3 is a schematic view of the initial state of the utility model during the usage;
FIG. 4 is a schematic diagram of the state of the utility model after use;
in the figure, 1 is a gas cylinder, 2 is a cylinder valve, 3 is a liquid phase inlet and outlet, 4 is a flexible container, 5 is a gas phase inlet and outlet, 6 is a vaporization valve, 7 is a pressure gauge, 8 is an inert gas source, 9 is a pump body, 10 is a three-way valve, 11 is a liquid phase passage switch, and 12 is a gas phase passage switch.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example 1
As shown in fig. 1, a siphon bottle for liquid standard substances comprises a gas bottle 1 and a bottle valve 2, wherein the bottle valve 2 is a double-head double-valve-core valve, one valve path on the bottle valve 2 is a liquid phase inlet/outlet 3 which extends into the gas bottle 1 through a communicating pipe to be communicated with a flexible container 4 inside the gas bottle 1, and the liquid standard substances are stored in the flexible container 4; the other valve path on the cylinder valve 2 is a gas phase inlet and outlet 5, the gas phase inlet and outlet 5 is communicated with the space between the gas cylinder 1 and the flexible container 4, and inert gas can be introduced into the space through the gas phase inlet and outlet 5, wherein the inert gas comprises but is not limited to helium or nitrogen. The liquid phase inlet and outlet 3 is connected with a vaporization valve 6. The vaporization valve 6 comprises a common heat-resistant valve body and a heating device wrapped and fixed outside the valve body, and the heating device is an electric heating sleeve. The flexible container 4 can be made of polychlorotrifluoroethylene material into a bag shape. The polychlorotrifluoroethylene material has low adsorptivity, low gas permeability, low organic volatile matter residue, excellent mechanical properties and certain elasticity, can meet the requirements of the contraction and expansion of the flexible container 4, and keeps the stability of a standard substance.
The communicating pipe is a metal pipe, the metal pipe is sealed with the opening of the flexible container 4, and the metal pipe extends into the bottom close to the flexible container 4, so that the internal standard substance is conveniently discharged from the metal pipe.
The gas inlet and outlet 5 is connected with a pressure gauge 7 for measuring the pressure of the inert gas so as to ensure that the pressure is always greater than the vapor pressure of the standard substance.
As shown in fig. 2, the utility model discloses still include a liquid standard substance system of preparing, including above-mentioned liquid standard substance siphon bottle, evacuation system and inert gas source 8, evacuation system includes the pump body 9, and the pump body 9 divide into two the tunnel through three-way valve 10, and one way is imported and exported 3 with the liquid phase through the control valve and is connected, and another way is imported and exported 5 with the gaseous phase through the control valve and is connected. An inert gas source 8 can be connected with the gas phase inlet and outlet 5 through a pipeline with a control valve, and the inert gas atmosphere is preferably helium.
The utility model discloses an implementation as follows:
1. the pressure required by the liquid standard substance mixed component required to be prepared when the liquid standard substance mixed component is completely liquefied in the space of the flexible container 4 can be determined according to process simulation software or experiments, so that the required charging pressure of the inert gas between the flexible container 4 and the gas bottle 1 is determined, and the gas pressure is ensured to be also greater than the vapor pressure of the standard substance when the space is maximum, namely the flexible container is contracted to the limit.
2. Opening a liquid phase passage switch 11 of the cylinder valve 2, communicating a pipeline between the liquid phase inlet and outlet 3 and the pump body 9, vacuumizing the flexible container 4 through the pump body 9, and closing the liquid phase passage switch 11 after reaching a set vacuum limit;
3. opening a gas phase access switch 12 of the cylinder valve 2, communicating a pipeline between the gas phase inlet and outlet 3 and the pump body 9, vacuumizing a space between the gas cylinder 1 and the flexible container 4 through the pump body 9, and closing the gas phase access switch 12 after a set vacuum limit is reached;
4. opening a liquid phase access switch 11 of the cylinder valve 2, and filling each component of the liquid standard substance into the flexible container 4 from the raw material cylinder, wherein the mixed standard substance is in a gas-liquid mixed phase;
5. opening a gas phase access switch 12 of the cylinder valve 2, communicating a high-pressure inert gas source 8 with the gas cylinder 1, filling helium gas into a space between the gas cylinder 1 and the flexible container 4 by using the high-pressure inert gas source 8 to pressurize to a set pressure, and pressurizing to ensure that a mixed standard substance in the flexible container 4 is gradually changed into a single liquid phase;
6. as shown in fig. 3-4, in use, the liquid standard substance is discharged from the liquid inlet/outlet 3 through the metal tube, and as the standard substance in the flexible container 4 is gradually reduced, the flexible container 4 will collapse around the liquid, and the single phase is continuously maintained due to the external pressure until the standard substance is used up;
7. the externally-placed standard substance is vaporized by a vaporization valve and then is introduced into chromatographic analysis so as to meet the analysis and monitoring requirements.
Under the current material conditions, standard substances inevitably permeate from the inside of the flexible container 4 to the outside of the flexible container 4 due to osmotic pressure as the gas cylinder is used for a long time. In a preferred embodiment of the present solution, a certain amount of the target substance of the liquid standard substance can be introduced into the space between the gas cylinder 1 and the flexible container 4. Artificially adding the target substance, reducing the osmotic pressure between the space and the flexible container 4, and reducing the content deviation caused by the permeation of the standard substance in the flexible container 4 to the external space in the process of longer-time use.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A liquid standard substance siphon bottle which is characterized in that: comprises a gas cylinder and at least one cylinder valve, wherein the cylinder valve is provided with a liquid phase inlet and a gas phase inlet which are not communicated with each other and can be controlled; the liquid phase inlet and outlet extend into the gas cylinder through a communicating pipe to be communicated with a flexible container, and the liquid standard substance is stored in the flexible container; the gas inlet and outlet are communicated with the space between the gas cylinder and the flexible container, and inert gas is introduced into the space.
2. The liquid standard substance siphon bottle of claim 1, wherein: the number of the cylinder valves is one, the cylinder valves are double-head double-valve-core valves, and the two valve paths are respectively a liquid phase inlet and a liquid phase outlet and a gas phase inlet and a gas phase outlet.
3. The liquid standard substance siphon bottle of claim 1, wherein: the liquid phase inlet and outlet are also connected with a vaporizing device.
4. The liquid standard substance siphon bottle of claim 3, wherein: the vaporization device is a vaporizer or a vaporization valve.
5. The liquid standard substance siphon bottle of claim 1, wherein: the flexible container is made of a material which is corrosion resistant, adsorption resistant, low in gas permeability, pressure resistant and capable of contracting and expanding.
6. The liquid standard substance siphon bottle of claim 1, wherein: the gas inlet and outlet are connected with a pressure gauge.
7. The liquid standard substance siphon bottle of claim 1, wherein: and a certain amount of target components in the liquid standard substance can be introduced into the space between the gas cylinder and the flexible container.
8. The liquid standard substance siphon bottle according to any one of claims 1 to 7, wherein: the communicating pipe is a metal pipe, and the metal pipe extends into the flexible container and approaches to the bottom of the flexible container.
9. A liquid standard substance preparation system, comprising the liquid standard substance siphon bottle according to any one of claims 1 to 8, a vacuum-pumping system and an inert gas source, wherein the vacuum-pumping system is respectively communicated with the liquid phase inlet and the gas phase inlet and outlet, and the inert gas source is communicated with the gas phase inlet and outlet.
10. The liquid standard substance preparation system according to claim 9, wherein the vacuum pumping system is a molecular pump with a switching pipeline or a combination of a molecular pump and a mechanical pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069223.4U CN211159834U (en) | 2019-11-26 | 2019-11-26 | Liquid standard substance siphon bottle and preparation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069223.4U CN211159834U (en) | 2019-11-26 | 2019-11-26 | Liquid standard substance siphon bottle and preparation system |
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| Publication Number | Publication Date |
|---|---|
| CN211159834U true CN211159834U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922069223.4U Active CN211159834U (en) | 2019-11-26 | 2019-11-26 | Liquid standard substance siphon bottle and preparation system |
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| Country | Link |
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| CN (1) | CN211159834U (en) |
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2019
- 2019-11-26 CN CN201922069223.4U patent/CN211159834U/en active Active
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