CN112903068B - A non-constant current low temperature static mass method calibration device and method thereof - Google Patents
A non-constant current low temperature static mass method calibration device and method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000003068 static effect Effects 0.000 title claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000011084 recovery Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000012795 verification Methods 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 12
- 238000003556 assay Methods 0.000 claims description 7
- 238000004949 mass spectrometry Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000003949 liquefied natural gas Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000004321 preservation Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 101100314150 Caenorhabditis elegans tank-1 gene Proteins 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/14—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a weighing apparatus
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Abstract
本发明公开了一种非恒流低温静态质量法检定装置及其方法，所述非恒流低温静态质量法检定装置包括低温标准罐、电子天平、深冷罐、低温储罐、回收罐、动力源、第一气动阀门、第二气动阀门、第三气动阀门、第四气动阀门、第五气动阀门、第一快速链接阀组、第二快速链接阀组、被检表。本发明提供的非恒流低温静态质量法检定装置，为确保回收液体的温度，回收液体首先经过深冷罐进行降温，然后进入低温储罐，从而防止液体气化，也避免管道和出口结霜。另外，本发明提供的管道采用真空管道，而且对其它部分进行保温处理，防止液体气体。
The present invention discloses a non-constant current low-temperature static mass method calibration device and a method thereof, wherein the non-constant current low-temperature static mass method calibration device comprises a low-temperature standard tank, an electronic balance, a cryogenic tank, a cryogenic storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group, and a meter to be tested. The non-constant current low-temperature static mass method calibration device provided by the present invention, in order to ensure the temperature of the recovered liquid, the recovered liquid first passes through a cryogenic tank for cooling, and then enters the cryogenic storage tank, thereby preventing the liquid from gasifying and also avoiding frosting of the pipeline and the outlet. In addition, the pipeline provided by the present invention adopts a vacuum pipeline, and other parts are subjected to insulation treatment to prevent liquid gas.
Description
Technical Field
The invention relates to the technical field of flow detection, in particular to a non-constant-current low-temperature static mass method calibrating device and a method thereof.
Background
The critical temperature of LNG (liquefied natural gas) in normal pressure state is-162 ℃, the LNG is easy to gasify, and pipelines and outlets are also easy to frost. The expansion ratio of the gas and the liquid at low temperature is large. In recent years, ecological environment pollution is increasingly emphasized by the state and the public, and LNG is used as a clean, efficient and low-carbon energy source, and is determined as the first choice of the low-carbon energy source by the state issuing and modifying department and the living building department. Among all clean fuels, natural gas is regarded as the most suitable alternative fuel for automobiles at present by a plurality of countries and specialists in the world because of mature, safe and reliable application technology and economic feasibility, and especially the application of LNG on automobiles is mainly urban buses, sanitation vehicles, taxis, intercity buses, heavy trucks and the like. The LNG wharf, LNG factory and LNG gas station are growing year by year, this involves trade measurement, because LNG belongs to low temperature liquid, the verification jar of storage liquid in the current normal atmospheric temperature static state quality method is non-closed, and traditional static state quality method is weight value on the scale gradually increases, and new low temperature static state quality method is weight value on the scale gradually reduces.
Disclosure of Invention
In order to solve the limitations and defects existing in the prior art, the invention provides a non-constant-flow low-temperature static mass method calibrating device, which comprises a low-temperature standard tank, an electronic balance, a cryogenic tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group and a inspected meter;
The low-temperature standard tank is arranged on the electronic balance, the low-temperature standard tank is used for storing low-temperature media used for verification, the low-temperature standard tank is manufactured by using a vacuum tank, the electronic balance is used for weighing weight changes of the media and providing standard weight, one end of the low-temperature standard tank is connected with the low-temperature storage tank through the second quick-link valve group, the other end of the low-temperature standard tank is connected with one end of the inspected table through the first pneumatic valve, the other end of the inspected table extends into the inner space of the recycling tank through the second pneumatic valve, and the other end of the inspected table is connected with the power source through the first quick-link valve group;
The lower part position of recovery jar with cryogenic tank's one end is connected, the recovery jar is used for storing the middle liquid that the examination was used, cryogenic tank's the other end passes through the third pneumatic valve with the power supply is connected, cryogenic tank is used for cooling down for retrieving liquid, the low temperature storage tank respectively through fourth pneumatic valve with fifth pneumatic valve with the power supply is connected, the low temperature storage tank is used for providing the low temperature liquid that the examination needs, pneumatic valve is used for changing the flow direction of medium in the pipeline.
Optionally, the shell of the cryogenic tank is made using vacuum.
Optionally, the housing of the recovery tank is made using vacuum.
Optionally, the power source is a cryopump or a compressor.
Optionally, the low-temperature standard tank, the first pneumatic valve, the second pneumatic valve, the first quick-link valve group, the second quick-link valve group and the inspected table are jointly arranged on the electronic balance.
The invention also provides a non-constant-current low-temperature static state mass method verification method, which uses the non-constant-current low-temperature static state mass method verification device, and comprises the following steps:
Closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick-link valve group and the second quick-link valve group, and starting the power source to enable low-temperature liquid to flow from the low-temperature storage tank to the low-temperature standard tank until the low-temperature standard tank is filled;
Closing the fourth pneumatic valve, the first quick link valve group, the second quick link valve group, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve and the second pneumatic valve to enable low-temperature liquid to flow through the inspected table from the low-temperature standard tank through the first pneumatic valve, then enter the recovery tank through the second pneumatic valve, adjusting the pressure of the second pneumatic valve and the verification tank, recording the weighing value Q1 ij and the count of the electronic balance when the flow reaches a verification flow point, wherein the count is the output pulse number of the inspected table, closing the second pneumatic valve when the weight of the low-temperature standard tank is reduced to a preset value, and recording the weighing value Q2 ij and the end count N ij of the electronic balance;
When the liquid level in the recovery tank reaches a preset height, the third pneumatic valve and the fifth pneumatic valve are opened, the power source is started, the recovery liquid enters the cryogenic tank for cooling, and the cooled low-temperature liquid is recovered into the low-temperature storage tank.
Optionally, the calculation formula of the accumulated flow measured at the jth time of the ith detection point of the non-constant-current low-temperature static state mass method detection device is as follows:
(Qs)ij＝Q1ij-Q2ij
the calculation formula of the accumulated mass flow measured by the ith detection point of the detected table for the jth time is as follows:
the error calculation formula for a single assay is as follows:
wherein, Q ij is the accumulated mass flow measured at the ith detection point of the detected meter for the jth time, (Q s)ij is the accumulated flow measured at the ith detection point of the non-constant-current low-temperature static mass method detection device for the jth time.
The invention has the following beneficial effects:
The invention provides a non-constant-flow low-temperature static mass method calibrating device which comprises a low-temperature standard tank, an electronic balance, a cryogenic tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group and a detected meter. According to the non-constant-flow low-temperature static mass method calibrating device provided by the invention, in order to ensure the temperature of the recovered liquid, the recovered liquid is firstly cooled by the cryogenic tank and then enters the low-temperature storage tank, so that the liquid is prevented from gasifying, and frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the invention adopts a vacuum pipeline, and other parts are subjected to heat preservation treatment to prevent liquid gas.
Drawings
Fig. 1 is a schematic structural diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention.
Fig. 2 is a schematic state diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention.
Fig. 3 is a schematic diagram of another state of the non-constant-current low-temperature static mass spectrometry calibration apparatus according to the first embodiment of the present invention.
Fig. 4 is a schematic diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention.
Fig. 5 is a block diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention.
The reference numerals comprise a low-temperature standard tank-1, an electronic balance-2, a cryogenic tank-3, a low-temperature storage tank-4, a recovery tank-5, a power source-6, a first pneumatic valve-11, a second pneumatic valve-12, a third pneumatic valve-13, a fourth pneumatic valve-14, a fifth pneumatic valve-15, a first quick-link valve group-16, a second quick-link valve group-17 and a checked meter-20.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the invention, the non-constant-current low-temperature static mass method calibrating device and the method thereof provided by the invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic structural diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention. Fig. 2 is a schematic state diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention. Fig. 3 is a schematic diagram of another state of the non-constant-current low-temperature static mass spectrometry calibration apparatus according to the first embodiment of the present invention. As shown in fig. 1-3, the present embodiment provides a non-constant-flow low-temperature static mass method calibration device, which includes a low-temperature standard tank 1, an electronic balance 2, a cryogenic tank 3, a low-temperature storage tank 4, a recovery tank 5, a power source 6, a first pneumatic valve 11, a second pneumatic valve 12, a third pneumatic valve 13, a fourth pneumatic valve 14, a fifth pneumatic valve 15, a first quick-link valve group 16, a second quick-link valve group 17, and a table 20. In the non-constant-flow low-temperature static mass method calibrating device provided by the embodiment, in order to ensure the temperature of the recovered liquid, the recovered liquid is firstly cooled by a cryogenic tank and then enters a low-temperature storage tank, so that the liquid is prevented from being gasified, and frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and performs heat preservation treatment on other parts to prevent liquid gas.
In this embodiment, the low temperature standard tank 1 is disposed on the electronic balance 2, the low temperature standard tank 1 is used for storing a low temperature medium used for verification, the low temperature standard tank 1 is manufactured by using a vacuum tank, the electronic balance 2 is used for weighing a medium weight change and providing a standard weight, one end of the low temperature standard tank 1 is connected with the low temperature storage tank 4 through the second quick link valve group 17, the other end of the low temperature standard tank 1 is connected with one end of the inspected table 20 through the first pneumatic valve 11, the other end of the inspected table 20 extends into an inner space of the recycling tank 5 through the second pneumatic valve 12, and the other end of the inspected table 20 is connected with the power source 6 through the first quick link valve group 16.
Fig. 4 is a schematic diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention. Fig. 5 is a block diagram of a non-constant-current low-temperature static mass method calibration device according to an embodiment of the invention. As shown in fig. 4 and 5, the lower portion of the recovery tank 5 is connected to one end of the cryogenic tank 3, the recovery tank 5 is used for storing intermediate liquid used for verification, the other end of the cryogenic tank 3 is connected to the power source 6 through the third pneumatic valve 13, the cryogenic tank 3 is used for cooling the recovered liquid, the cryogenic tank 4 is connected to the power source 6 through the fourth pneumatic valve 14 and the fifth pneumatic valve 15, respectively, the cryogenic tank 4 is used for providing low-temperature liquid required for verification, and the pneumatic valves are used for changing the flow direction of the medium in the pipeline.
In this embodiment, the housing of the cryogenic tank 3 is made by vacuum, the housing of the recovery tank 5 is made by vacuum, the power source 6 is a cryopump or a compressor, and the low-temperature standard tank 1, the first pneumatic valve 11, the second pneumatic valve 12, the first quick-link valve group 16, the second quick-link valve group 17 and the inspected table 20 are jointly arranged on the electronic balance 2.
The low-temperature standard tank provided by the embodiment is used for storing low-temperature media for verification, and the low-temperature standard tank is manufactured by adopting a vacuum tank. The electronic balance is used for weighing the weight change of the medium and providing standard weight. The cryogenic tank is used for cooling the recovered liquid, and the shell of the cryogenic tank is manufactured by vacuum. The low-temperature storage tank is used for providing low-temperature liquid required by verification, the recovery tank is used for storing intermediate liquid for verification, and the shell of the recovery tank is manufactured by vacuum. The power source is a cryopump or a compressor. The pneumatic valve provided by the embodiment changes the flow direction of the medium in the pipeline according to the requirement.
The non-constant-flow low-temperature static mass method calibrating device comprises a low-temperature standard tank, an electronic balance, a cryogenic tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group and a detected meter. In the non-constant-flow low-temperature static mass method calibrating device provided by the embodiment, in order to ensure the temperature of the recovered liquid, the recovered liquid is firstly cooled by a cryogenic tank and then enters a low-temperature storage tank, so that the liquid is prevented from being gasified, and frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and performs heat preservation treatment on other parts to prevent liquid gas.
Example two
The embodiment provides a non-constant-current low-temperature static mass method verification method, and the non-constant-current low-temperature static mass method verification method uses the non-constant-current low-temperature static mass method verification device provided in the first embodiment, and the specific content can be referred to the description of the first embodiment and is not repeated herein.
Referring to fig. 2, the present embodiment closes the second pneumatic valve 12, the third pneumatic valve 13, and the fifth pneumatic valve 15, opens the first pneumatic valve 11, the fourth pneumatic valve 14, the first quick-link valve group 16, and the second quick-link valve group 17, and activates the power source 6 so that the cryogenic liquid flows from the cryogenic storage tank 4 to the cryogenic standard tank 1 until the cryogenic standard tank 1 is filled. In the non-constant-flow low-temperature static mass method calibrating device provided by the embodiment, in order to ensure the temperature of the recovered liquid, the recovered liquid is firstly cooled by a cryogenic tank and then enters a low-temperature storage tank, so that the liquid is prevented from being gasified, and frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and performs heat preservation treatment on other parts to prevent liquid gas.
Referring to fig. 3, in this embodiment, the fourth air valve 14, the first quick link valve group 16, the second quick link valve group 17, the third air valve 13, and the fifth air valve 15 are closed, the first air valve 11 and the second air valve 12 are opened, so that the cryogenic liquid flows from the cryogenic standard tank 1 through the first air valve 11 to the inspected table 20, then flows through the second air valve 12 to the recovery tank 5, the pressures of the second air valve 12 and the inspected tank are adjusted, when the flow rate reaches the inspected flow point, the weighing value Q1 ij and the count of the electronic balance 2 are recorded, the count is the output pulse number of the inspected table 20, when the weight of the cryogenic standard tank 1 is reduced to a preset value, the second air valve 12 is closed, and the weighing value Q2 ij and the end count N ij of the electronic balance 2 are recorded.
Referring to fig. 4, when the liquid level inside the recovery tank 5 reaches a preset height, the third pneumatic valve 13 and the fifth pneumatic valve 15 are opened, the power source 6 is started, the recovered liquid enters the cryogenic tank 3 to cool, and the cooled low-temperature liquid is recovered into the low-temperature storage tank 4. The calculation formula of the accumulated flow measured at the jth time of the ith detection point of the non-constant-current low-temperature static state mass method detection device is as follows:
(Qs)ij＝Q1ij-Q2ij
The calculation formula of the accumulated mass flow measured by the ith detection point of the detected table 20 for the jth time is as follows:
the error calculation formula for a single assay is as follows:
Wherein Q ij is the accumulated mass flow measured at the ith detection point of the detected table 20 for the jth time, (Q s)ij is the accumulated flow measured at the ith detection point of the non-constant-current low-temperature static mass method detection device for the jth time.
The standard tank liquid inlet flow and the flowmeter pre-cooling steps provided in the embodiment are as follows:
And closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick-connection valve group and the second quick-connection valve group, starting a power source, and enabling the low-temperature liquid to flow from the low-temperature storage tank to the standard tank and to be filled. In this process, the pre-cooling operation of the flowmeter is completed.
The flow meter verification provided in this embodiment includes the following steps:
And closing a fourth pneumatic valve, a first quick link valve group, a second quick link valve group, a third pneumatic valve and a fifth pneumatic valve, opening the first pneumatic valve and the second pneumatic valve, enabling low-temperature liquid to flow from the standard tank through the inspected meter, then enter the recovery tank through the second pneumatic valve, enabling the low-temperature liquid to pass through the second pneumatic valve and the pressure of the verification tank, recording the current weighing value Q1 ij and the count (counting the output pulse number of the inspected meter) simultaneously by the control system when the flow reaches the verification flow point, closing the second pneumatic valve when the weight of the standard tank is reduced to a preset value, and recording the weighing value Q2 ij and the end count N ij. And (5) finishing the verification once. When the liquid level in the recovery tank reaches a certain height, the third pneumatic valve and the fifth pneumatic valve of the valve are opened, the power source is started, the low-temperature liquid is recovered into the storage tank, and in order to ensure the temperature of the recovered liquid, the recovered liquid enters the storage tank after being cooled by the cryogenic tank.
Referring to fig. 4, the cumulative flow (kg) measured by the jth assay device at the ith assay point is:
(Qs)ij＝Q1ij-Q2ij
the accumulated mass flow (kg) measured by the jth detected flowmeter at the ith detection point is:
The error of the single verification is:
The low temperature standard tank, the first pneumatic valve, the second pneumatic valve, the first quick-link valve group, the second quick-link valve group and the inspected meter are installed on an electronic balance together. The pipeline adopts a vacuum pipeline to perform heat preservation treatment on other parts, so that liquid gas is prevented. Because the coriolis mass flowmeter has no requirement on the front and rear straight pipe sections, the pipeline used is as short as possible.
In the non-constant-current low-temperature static state mass method verification method provided by the embodiment, the non-constant-current low-temperature static state mass method verification device comprises a low-temperature standard tank, an electronic balance, a cryogenic tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group and a tested meter. In the non-constant-flow low-temperature static mass method calibrating device provided by the embodiment, in order to ensure the temperature of the recovered liquid, the recovered liquid is firstly cooled by a cryogenic tank and then enters a low-temperature storage tank, so that the liquid is prevented from being gasified, and frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and performs heat preservation treatment on other parts to prevent liquid gas.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (5)
1. The non-constant-flow low-temperature static mass method calibrating device is characterized by comprising a low-temperature standard tank, an electronic balance, a cryogenic tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick-link valve group, a second quick-link valve group and a detected meter;
The low-temperature standard tank is arranged on the electronic balance, the low-temperature standard tank is used for storing low-temperature media used for verification, the low-temperature standard tank is manufactured by using a vacuum tank, the electronic balance is used for weighing weight changes of the media and providing standard weight, one end of the low-temperature standard tank is connected with the low-temperature storage tank through the second quick-link valve group, the other end of the low-temperature standard tank is connected with one end of the inspected table through the first pneumatic valve, the other end of the inspected table extends into the inner space of the recycling tank through the second pneumatic valve, and the other end of the inspected table is connected with the power source through the first quick-link valve group;
The lower part of the recovery tank is connected with one end of the cryogenic tank, the recovery tank is used for storing middle liquid for verification, the other end of the cryogenic tank is connected with the power source through the third pneumatic valve, the cryogenic tank is used for cooling the recovery liquid, the low-temperature storage tank is connected with the power source through the fourth pneumatic valve and the fifth pneumatic valve respectively, the low-temperature storage tank is used for providing low-temperature liquid required by verification, and the pneumatic valve is used for changing the flow direction of a medium in a pipeline;
the power source is a cryopump or a compressor;
The low-temperature standard tank, the first pneumatic valve, the second pneumatic valve, the first quick-link valve group, the second quick-link valve group and the inspected table are jointly arranged on the electronic balance.
2. The non-constant flow low temperature static mass spectrometry assay device of claim 1, wherein the housing of the cryogenic tank is fabricated using vacuum.
3. The non-constant flow low temperature static mass spectrometry assay device of claim 1, wherein the housing of the recovery tank is made using vacuum.
4. The non-constant-current low-temperature static state mass method verification method is characterized in that the non-constant-current low-temperature static state mass method verification method uses the non-constant-current low-temperature static state mass method verification device according to any one of claims 1-3, and the non-constant-current low-temperature static state mass method verification method comprises the following steps:
Closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick-link valve group and the second quick-link valve group, and starting the power source to enable low-temperature liquid to flow from the low-temperature storage tank to the low-temperature standard tank until the low-temperature standard tank is filled;
Closing the fourth pneumatic valve, the first quick link valve group, the second quick link valve group, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve and the second pneumatic valve to enable low-temperature liquid to flow through the inspected table from the low-temperature standard tank through the first pneumatic valve, then enter the recovery tank through the second pneumatic valve, adjusting the pressure of the second pneumatic valve and the verification tank, recording the weighing value Q1 ij and the count of the electronic balance when the flow reaches a verification flow point, wherein the count is the output pulse number of the inspected table, closing the second pneumatic valve when the weight of the low-temperature standard tank is reduced to a preset value, and recording the weighing value Q2 ij and the end count N ij of the electronic balance;
When the liquid level in the recovery tank reaches a preset height, the third pneumatic valve and the fifth pneumatic valve are opened, the power source is started, the recovery liquid enters the cryogenic tank for cooling, and the cooled low-temperature liquid is recovered into the low-temperature storage tank.
5. The method for verifying the non-constant-current low-temperature static mass method according to claim 4, wherein a calculation formula of the accumulated flow measured at the jth time at the ith verification point of the non-constant-current low-temperature static mass method verification device is as follows:
(Qs)ij＝Q1 ij-Q2ij
the calculation formula of the accumulated mass flow measured by the ith detection point of the detected table for the jth time is as follows:
the error calculation formula for a single assay is as follows:
wherein, Q ij is the accumulated mass flow measured at the ith detection point of the detected meter for the jth time, (Q s)ij is the accumulated flow measured at the ith detection point of the non-constant-current low-temperature static mass method detection device for the jth time.
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| CN113588047B (en) * | 2021-08-04 | 2022-05-10 | 西安航天动力试验技术研究所 | Flowmeter calibration system and method for low-temperature propellant rocket engine |
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| CN110608788A (en) * | 2019-09-12 | 2019-12-24 | 湖南工业大学 | A viscous liquid flow automatic detection system and method |
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| CN214277149U (en) * | 2021-02-11 | 2021-09-24 | 烟台中隆仪表有限公司 | Non-constant-current low-temperature static mass method calibrating device |
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