CN214471139U - Volume measuring system for small-volume metal container - Google Patents
Volume measuring system for small-volume metal container Download PDFInfo
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- CN214471139U CN214471139U CN202023307085.8U CN202023307085U CN214471139U CN 214471139 U CN214471139 U CN 214471139U CN 202023307085 U CN202023307085 U CN 202023307085U CN 214471139 U CN214471139 U CN 214471139U
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Abstract
The utility model belongs to the isotope measurement technique, concretely relates to metal small volume container volume measurement system, including the stainless steel jar, the valve of being connected with the stainless steel jar, first film rule and second film rule and all-metal seal valve, all-metal seal valve is connected with the pump package, at first dismantle the stainless steel jar, close all-metal seal valve, confirm the quality behind stainless steel jar quality and the injection deionized water, reach the volume, utilize alcohol to confirm the small volume that awaits measuring, the stainless steel jar is ventilated after the dress back valve, confirm the small volume that awaits measuring through twice pressure, this method easy operation, high efficiency, the accuracy is good, the systematic design has been avoided self gassing and the pressure that leads to fluctuate and the error that arouses the volume test of small volume container.
Description
Technical Field
The utility model belongs to the isotope measurement technique, concretely relates to small volume container volume survey system of metal.
Background
Isotope with a certain amount of substance is used as a diluent, the isotope and gas isotope in a sample to be detected are uniformly mixed in an ultrahigh vacuum system and enter a mass spectrometer, the ratio of the isotope of the sample to be detected to the isotope of the diluent is determined, and the content of the isotope of the sample to be detected is further obtained, and the method is called as a diluent method. The diluent method is one of high-precision methods for measuring the content of rare gas, the accurate quantitative transfer of diluent is the basic premise for measuring the content of rare gas by the diluent method, and the transfer of diluent is basically completed by adopting a small-volume container with a certain volume at present, so that the quantity of substances entering a mass spectrometer diluent can be accurately obtained only by accurately measuring the size of the small-volume container.
There are currently two main methods for the determination of small volume containers: (1) the mass difference method is that a small volume part is filled with liquid, the mass of the small volume before and after the liquid is filled is weighed, and the volume of the small volume container is calculated by combining the density of the liquid. Because the small-volume container used for measuring the content of the rare gas is basically processed by all metal materials, two metal valve heads are adopted in the structure, and the corrugated pipes outside the metal valve heads stretch out and draw back to seal and intercept a section of small volume. The metal valve head and the corrugated pipe determine that the small-volume container has relatively large mass, the mass of injected liquid is relatively small due to the small internal volume of the small-volume container to be tested, and the mass of the whole small-volume container does not change obviously before and after the small-volume container is injected with the liquid, so that a large test error can be caused; (2) the gas pressure comparison method is characterized in that small-volume containers to be measured and small-volume containers with known volumes are connected to a public part pipeline, the public part pipeline is provided with a high-precision film gauge, then a certain amount of gas is introduced to balance the pressure of the two small-volume containers, the gas in the two small-volume containers is respectively diffused to the public pipeline, the volume ratio of the two small-volume containers is obtained by utilizing the pressure ratio generated by the two small-volume containers, and the size of the small volume to be measured is calculated. The method has high precision and simple operation, but needs a calibrated small volume in a laboratory as reference, and the error of the small volume to be measured is greatly influenced by the error of the known small volume, so that the method has certain limitation.
Disclosure of Invention
The utility model aims at providing a little volume container volume survey system of metal, it can accurate survey be used for the ration to move the little volume container volume of getting the diluent, and adaptability is better.
The technical scheme of the utility model as follows:
a volume measuring system of a metal small-volume container comprises a stainless steel tank, a valve connected with a test port of the stainless steel tank, a first film gauge, a second film gauge and an all-metal sealing valve, wherein the all-metal sealing valve is connected with a pump assembly;
the valve comprises a valve seat, a valve clack and a valve head which are arranged in the valve seat, and a driving mechanism of the valve head;
the valve heads comprise a first metal valve head and a second metal valve head; the interior of the valve seat is divided into an upper inner cavity and a lower inner cavity, a first metal valve head and a second metal valve head are respectively installed on the upper inner cavity and the lower inner cavity, and the first metal valve head and the second metal valve head are respectively driven by a driving mechanism to move up and down in the valve seat;
the valve clack is positioned in the valve seat, the middle part of the valve clack is processed into an inward-protruding inclined plane serving as a sealing surface, the valve clack comprises an upper inclined plane and a lower inclined plane, and the upper inclined plane and the lower inclined plane respectively form a small volume to be measured with the first metal valve head and the second metal valve head;
a small-volume air inlet is processed at the lower end of the valve seat, and a small-volume air outlet is processed at the upper end of the valve seat; the small-volume air inlet and the small-volume air outlet respectively penetrate through the valve clack and are communicated with the interior of the valve body.
The first metal valve head is driven by a first metal valve head driving rod connected with the first metal valve head, and the second metal valve head is driven by a second metal valve head driving rod connected with the second metal valve head.
The pump assembly comprises a molecular pump and a vortex dry pump which are connected through a vacuum rubber tube.
The molecular pump is connected with the ion gauge through a pipeline, and the molecular pump is connected with the all-metal sealing valve through a pipeline.
The molecular pump is connected with the ion gauge through a pipeline, and a flange is arranged on the pipeline; the molecular pump is connected with the all-metal sealing valve through a pipeline, and a flange is arranged on the pipeline.
The stainless steel tank is provided with flanges on pipelines connected with the test port, the corresponding valve, the corresponding first membrane gauge, the corresponding second membrane gauge and the corresponding all-metal sealing valve.
When the first metal valve head and the second metal valve head are respectively in close contact with the sealing surfaces on the corresponding sides, the small volume to be measured is sealed.
The utility model discloses the effect as follows: the volume test for small-volume containers has the advantages of simple operation, high efficiency, accuracy and the like, and the volume test error can be controlled within +/-1% even for small-volume containers with the volume as small as 0.1 cc.
The small-volume container measuring system mainly comprises an all-metal small-volume container to be measured, a stainless steel tank, two film gauges with different measuring ranges, an all-metal sealing valve, an ion gauge, a molecular pump and a vortex dry pump. Different vacuum elements of the measuring system are hermetically connected by adopting a knife edge flange, the whole system is made of all-metal materials and can be baked and deaerated at high temperature, so that the vacuum degree can reach 1.0E-08mbar, and errors caused by pressure fluctuation caused by the air release of the system in the testing process on the volume test of a small-volume container are avoided; a large-volume stainless steel tank (about 500ml) is adopted, so that the test error caused by the tiny change of the volume of the corrugated pipe can be ignored in the opening and closing process of the small-volume valve head to be tested; the two film gauges are connected in series for use, so that high-precision pressure intensity test can be realized within a wider pressure intensity measuring range, the pressure intensity of gas sealed in a small volume can be accurately measured before and after the gas is diluted in the stainless steel tank, and the accuracy of small-volume calculation is obviously improved.
Drawings
FIG. 1 is a schematic diagram of a volumetric measurement system for a small volume metal container;
in the figure: 1 is a first metal valve head driving rod, 2 is a first welding corrugated pipe, 3 is a first metal valve head, 4 is a small volume to be measured, 5 is a small-volume air inlet, 6 is a second metal valve head, 7 is a second welding corrugated pipe, 8 is a second metal valve head driving rod, 9 is a small-volume air outlet, 10 is a first film gauge, 11 is a second film gauge, 12 is a stainless steel tank, 13 is an all-metal sealing valve, 14 is an ion gauge, 15 is a molecular pump, and 16 is a vortex dry pump;
17. 18, 19, 20, 21 and 22 are sequentially as follows: the flange comprises a first flange, a second flange, a third flange, a fourth flange, a fifth flange and a sixth flange;
23. a valve seat; 24. and (4) a valve.
Detailed Description
The present invention will be further explained with reference to the drawings and the detailed description.
As shown in fig. 1, the volumetric measurement system for the metal small-volume container includes a stainless steel tank 12, valves respectively connected to several test ports of the stainless steel tank 12, first and second gauge films 10 and 11, an all-metal sealing valve 13, and the all-metal sealing valve 13 is connected to a pump assembly;
the pump assembly comprises a molecular pump 15 and a vortex dry pump 16, wherein the molecular pump 15 is connected with an ion gauge 14 through a sixth flange 22, and a full metal sealing valve 13 is connected on a pipeline between the sixth flange 22 and the molecular pump 15 through a tee joint and a fifth flange 21;
the molecular pump 15 and the vortex dry pump 16 are connected through a vacuum hose.
A fourth flange 20 is arranged on a pipeline between the testing ports of the full metal sealing valve 13 and the stainless steel tank 12;
a third flange 19 is arranged on the pipeline between the second film gauge 11 and the testing port of the stainless steel tank 12;
a second flange 18 is arranged on a pipeline between the first film gauge 10 and the test port of the stainless steel tank 12;
a first flange 17 is arranged on a pipeline between the valve and the test port of the stainless steel tank 12;
the valve comprises a valve seat 23, a valve clack 34 and a valve head which are arranged in the valve seat 23, and a driving mechanism of the valve head.
The valve head is installed in the cavity of the valve seat 23, in this embodiment, the interior of the valve seat 23 is divided into an upper cavity and a lower cavity, and the first metal valve head 3 and the second metal valve head 6 are installed respectively; the first metal valve head 3 is driven by a first metal valve head driving rod 1 connected with the first metal valve head, and the second metal valve head 6 is driven by a second metal valve head driving rod 8 connected with the second metal valve head;
a certain distance is reserved between the first metal valve head 3 and the second metal valve head 6, and the first metal valve head and the valve clack 24 in the valve seat 23 form a small volume 4 to be measured together;
the lower end of the valve seat 23 is provided with a small-volume air inlet 5, the upper end of the valve seat 23 is provided with a small-volume air outlet 9, and a first flange 17 is arranged on a pipeline between the small-volume air outlet 9 and the test port of the stainless steel tank 12.
As shown in fig. 1, the valve flap 24 is located in the valve seat 23, and the middle of the valve flap is processed into an inward-protruding inclined surface, which includes an upper inclined surface and a lower inclined surface, and is respectively matched with the first metal valve head 3 and the second metal valve head 6 to form a small volume 4 to be measured; the upper and lower inclined surfaces are therefore also referred to as sealing surfaces.
The small-volume air inlet 5 and the small-volume air outlet 9 are respectively communicated with the interior of the valve body through the valve clack 24. When the first metal valve head 3 and the second metal valve head 6 are respectively in close contact with the sealing surfaces on the corresponding sides, the small volume 4 to be measured is sealed; after the second metal valve head driving rod 8 and the first metal valve head driving rod 1 drive the respective second metal valve head 6 and the first metal valve head 3 to leave the sealing surface, gas enters the region of the small volume 4 to be detected from the small volume gas inlet 5, and then is reserved outside the valve from the small volume gas outlet 9.
The stainless steel tank 12 is made of 316L stainless steel, and the inner wall of the stainless steel tank is subjected to electrolytic polishing and vacuum furnace degassing treatment;
the measuring range of the first film gauge 10 is 0.1-1000torr, the testing accuracy is 0.15% of the reading, the internal volume is 4.2ml, the measuring range of the second film gauge 11 is 0.001-10torr, the testing accuracy is 0.15% of the reading, and the internal volume is 4.2 ml;
the first film gauge 10 and the second film gauge 11 both have a temperature compensation function;
range of the ion gauge 14 is 10-3-10-12mbar；
The ultimate vacuum degree of the molecular pump 15 is 10-11mbar。
The purpose of the flanges in the overall system is to facilitate the disassembly of the stainless steel tank 12 from the other components, all with CF flanges.
Claims (7)
1. A system for measuring the volume of a metal small-volume container is characterized in that: the device comprises a stainless steel tank (12), a valve connected with a test port of the stainless steel tank (12), a first membrane gauge (10), a second membrane gauge (11) and an all-metal sealing valve (13), wherein the all-metal sealing valve (13) is connected with a pump assembly;
the valve comprises a valve seat (23), a valve clack (24) and a valve head which are arranged in the valve seat (23), and a driving mechanism of the valve head;
the valve head comprises a first metal valve head (3) and a second metal valve head (6); the interior of the valve seat (23) is divided into an upper inner cavity and a lower inner cavity, a first metal valve head (3) and a second metal valve head (6) are respectively installed, and the first metal valve head and the second metal valve head are respectively driven by a driving mechanism to move up and down in the valve seat (23);
the valve clack (24) is positioned in the valve seat (23), a conical inclined plane is processed in the middle of the valve clack as a sealing surface, the valve clack comprises an upper inclined plane and a lower inclined plane, and the upper inclined plane and the lower inclined plane respectively form a small volume (4) to be measured with the first metal valve head (3) and the second metal valve head (6);
a small-volume air inlet (5) is processed at the lower end of the valve seat (23), and a small-volume air outlet (9) is processed at the upper end of the valve seat (23); the small-volume air inlet (5) and the small-volume air outlet (9) respectively penetrate through the valve clack (24) to be communicated with the interior of the valve body.
2. A metal small-volume container volumetric measuring system as defined in claim 1, wherein: the first metal valve head (3) is driven by a first metal valve head driving rod (1) connected with the first metal valve head, and the second metal valve head (6) is driven by a second metal valve head driving rod (8) connected with the second metal valve head.
3. A metal small-volume container volumetric measuring system as defined in claim 1, wherein: the pump assembly comprises a molecular pump (15) and a vortex dry pump (16), and the molecular pump and the vortex dry pump are connected through a vacuum hose.
4. A metal small-volume container volumetric measuring system as defined in claim 3, wherein: the molecular pump (15) is connected with the ion gauge (14) through a pipeline, and the molecular pump (15) is connected with the all-metal sealing valve (13) through a pipeline.
5. A metal small-volume container volumetric measuring system as defined in claim 4, wherein: the pipeline is provided with a flange.
6. A metal small-volume container volumetric measuring system as defined in claim 4, wherein: the stainless steel tank (12) is provided with flanges on pipelines of which the testing ports are connected with the corresponding valves, the first membrane gauge (10), the second membrane gauge (11) and the all-metal sealing valve (13).
7. A metal small-volume container volumetric measuring system as defined in claim 1, wherein: when the first metal valve head (3) and the second metal valve head (6) are respectively in close contact with the sealing surfaces on the corresponding sides, the small volume (4) to be measured is sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023307085.8U CN214471139U (en) | 2020-12-31 | 2020-12-31 | Volume measuring system for small-volume metal container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023307085.8U CN214471139U (en) | 2020-12-31 | 2020-12-31 | Volume measuring system for small-volume metal container |
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| Publication Number | Publication Date |
|---|---|
| CN214471139U true CN214471139U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023307085.8U Active CN214471139U (en) | 2020-12-31 | 2020-12-31 | Volume measuring system for small-volume metal container |
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| CN (1) | CN214471139U (en) |
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- 2020-12-31 CN CN202023307085.8U patent/CN214471139U/en active Active
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