CN103216727B - Primary and secondary capacitance-type sensor with inner ring structure - Google Patents
Primary and secondary capacitance-type sensor with inner ring structure Download PDFInfo
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- CN103216727B CN103216727B CN201310135439.0A CN201310135439A CN103216727B CN 103216727 B CN103216727 B CN 103216727B CN 201310135439 A CN201310135439 A CN 201310135439A CN 103216727 B CN103216727 B CN 103216727B
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- intervalve
- outer tube
- capacitive transducer
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- interior pipe
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- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 76
- 239000002184 metal Substances 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 abstract description 17
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a primary and secondary capacitance-type sensor with an inner ring structure, which can be applied to a liquid level detector. The primary and secondary capacitance-type sensor comprises a primary capacitance-type sensor and a secondary capacitance-type sensor, wherein the primary capacitance-type sensor mainly comprises an outer tube and an intermediate tube; the two ends of the intermediate tube are respectively supported in and connected to the outer tube in an insulating way; the outer tube and the intermediate tube are respectively provided with at least one through hole; the outer tube and the intermediate tube are taken as two detection electrodes of the primary capacitance-type sensor; an inner tube is supported in and connected to the intermediate tube in an insulating way; the inner tube is provided with at least one inner through hole; the outer tube and the inner tube are taken as two detection electrodes of the secondary capacitance-type sensor; and the length of the inner tube is not longer than three quarters of that of the intermediate tube. After the primary and secondary capacitance-type sensor is adopted, the measurement accuracy of the liquid level detector for detecting the liquid level of liquefied natural gas can be improved, and the measurement error can be reduced.
Description
Technical field
The present invention relates to the Level meter for detecting LNG Liquefied natural gas liquid level in basin, referring more particularly to the capacitive transducer in Level meter.
Background technique
LNG Liquefied natural gas is more and more extensive as its application of a kind of clean energy resource, being used for liquefying, storage, transport and load in the container of LNG Liquefied natural gas, usually being all configured with Level meter to detect and showing the liquid level of LNG Liquefied natural gas.The structure of Level meter conventional at present comprises: be installed on the sensor device in basin inner chamber, sensor device outer signal processor, signal processor is connected with liquid level indicator; Sensor device used is at present single, to be used for detecting LNG liquid level in a basin capacitive transducer.Capacitive transducer is one of core component of Level meter, it is installed in the basin inner chamber loading LNG Liquefied natural gas, when after LNG Liquefied natural gas filling in basin, also LNG Liquefied natural gas can be poured in capacitive transducer, and the Capacity of capacitive transducer linearly can increase along with the rising of LNG Liquefied natural gas liquid level; Utilize the above-mentioned characteristic of capacitive transducer, signal processor in Level meter is by the Capacity of Detection capacitance formula sensor, and a real-time level signal will be exported after capacitance value conversion treatment to the liquid level indicator with signal processor cooperating, show the liquid level of LNG Liquefied natural gas in basin in real time.
The structure of capacitive transducer conventional is at present: comprise the outer tube as testing electrode and interior pipe, the two ends of interior pipe are connected in outer tube respectively by dielectric support block insulating supporting, the end cap seat welded mutually with outer tube is coated with outside dielectric support block, the metal screen layer electrical connection of outer tube and extraction wire, the electrode plate in interior pipe is electrically connected with the metal core wire of drawing wire; Outer tube and interior pipe are also provided with the through hole for LNG Liquefied natural gas turnover.
There is following shortcoming in the Level meter of said structure and the capacitive transducer adopted: the quality of LNG Liquefied natural gas can be variant because of the difference of the factors such as the place of production, wherein, difference the having the greatest impact to capacitive transducer Capacity of the permittivity of the LNG Liquefied natural gas of different quality.For the basin that certain is determined, its Level meter configured is just tested before formally coming into operation, usually certain LNG Liquefied natural gas determined can only be selected in debug process---be assumed to be LNG Liquefied natural gas D, so, in actual use, the permittivity of LNG Liquefied natural gas filling in basin and the permittivity of LNG Liquefied natural gas D more close, Level meter is by the liquid level detected by capacitive transducer more close to the actual liquid level in basin, and namely its testing result is more accurate; When the permittivity of LNG Liquefied natural gas filling in basin and the permittivity of LNG Liquefied natural gas D depart from too much, adopt the Level meter of above-mentioned capacitive transducer just cannot be judged in basin exactly actual liquid level according to the Capacity of sensor, also just cannot detect the liquid level of LNG Liquefied natural gas in basin exactly, will give basin normally filling, transport and use bring inconvenience.
Summary of the invention
The object of this invention is to provide a kind of primary and secondary capacitive transducer that Level meter can be made to detect the interior ring structure of LNG Liquefied natural gas liquid level in basin exactly.
For achieving the above object, present invention employs following technological scheme.
The primary and secondary capacitive transducer of interior ring structure, comprise: main capacitance formula sensor, the structure of main capacitance formula sensor comprises: outer tube and the intervalve being arranged in outer tube, the two ends of intervalve are connected in outer tube respectively by major insulation support block insulating supporting, outer tube and intervalve are respectively arranged with at least one through hole passed in and out for LNG Liquefied natural gas, the metal screen layer of main extraction wire is electrically connected with outer tube, the metal core wire of main extraction wire is electrically connected with intervalve, makes outer tube and intervalve as two testing electrodes of main capacitance formula sensor; Be characterized in: be also provided with a sub-capacitive transducer, the structure of sub-capacitive transducer comprises: be also provided with in intervalve in one and manage, one end of interior pipe is arranged on the major insulation support block of one end, the other end of interior pipe is connected in intervalve by interior dielectric support block insulating supporting, interior pipe is provided with the inner via hole that at least one passes in and out for LNG Liquefied natural gas, the metal screen layer that son draws wire is electrically connected with outer tube, son is drawn the metal core wire of wire and is electrically connected with interior pipe, makes outer tube and interior pipe as two testing electrodes of sub-capacitive transducer; And the length of interior pipe is no more than 3/4ths of intervalve length.
Further, the primary and secondary capacitive transducer of aforesaid interior ring structure, wherein, the length of interior pipe is no more than 1/2nd of intervalve length.
Further, the primary and secondary capacitive transducer of aforesaid interior ring structure, wherein, the length of interior pipe is no more than 1/3rd of intervalve length.
Further, the primary and secondary capacitive transducer of aforesaid interior ring structure, wherein, is coated with the end cap seat welded mutually with outer tube outside major insulation support block.
Further, the primary and secondary capacitive transducer of aforesaid interior ring structure, wherein, is welded with electrode plate in intervalve, and the metal core wire of main extraction wire is electrically connected with electrode plate by screw.
Beneficial effect of the present invention: when reality uses, the signal processor in Level meter first stores fully loaded Capacity CD when sub-capacitive transducer is filled LNG Liquefied natural gas D; When each filling use, signal processor collection the fully loaded Capacity CA stored when sub-capacitive transducer is filled other LNG Liquefied natural gas, and Capacity CA and CD is made comparisons, obtain the value t reacting electric capacitance change ratio, signal processor recycling t goes the Capacity adjusting main capacitance formula sensor, thus the measuring accuracy of liquid level can be improved, substantially reduce measurement error.Or, utilize during each filling LNG of sub-capacitive transducer and can guarantee first to be full of, thus calculate at every turn the permittivity of filling LNG Liquefied natural gas, thus the fully loaded Capacity that can calculate exactly in advance when each reality of main capacitance formula sensor uses, can improve measuring accuracy equally, reduce measurement error.
Accompanying drawing explanation
Fig. 1 is the structural representation of the primary and secondary capacitive transducer of interior ring structure of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the primary and secondary capacitive transducer to interior ring structure of the present invention is further described.
Shown in Figure 1, the primary and secondary capacitive transducer of interior ring structure of the present invention, comprise: main capacitance formula sensor, the structure of main capacitance formula sensor comprises: outer tube 1 and the intervalve 2 being arranged in outer tube 1, the two ends of intervalve 2 are connected in outer tube 1 respectively by major insulation support block 3 and 31 insulating supporting, the end cap seat 4 welded mutually with outer tube 1 is coated with outside major insulation support block 3, the end cap seat 41 welded mutually with outer tube 1 is coated with outside major insulation support block 31, by arranging end cap seat 4 and 41, major insulation support block 3 and 31 can be protected on the one hand, major insulation support block 3 and 31 is made to be connected in outer tube 1 and intervalve 2 more reliably on the other hand, the two-end part of outer tube 1 is respectively arranged with at least one through hole 11 passed in and out for LNG Liquefied natural gas, the two-end part of intervalve 2 is respectively arranged with at least one through hole 21 passed in and out for LNG Liquefied natural gas, the metal screen layer 7 of main extraction wire 6 is electrically connected with outer tube 1, the metal core wire 61 of main extraction wire 6 is electrically connected with intervalve 2---in intervalve 2, be welded with electrode plate 5 in the present embodiment, the metal core wire 61 of main extraction wire 6 and isolation layer thereof are together successively through taper plug, after end cap seat 4 and major insulation support block 3, metal core wire 61 is electrically connected with electrode plate 5 by screw 10, thus guarantee that metal core wire 61 is connected with electrode plate 5 is reliable and stable, the conductor vibration that the external world can cause by taper plug intercepts outside electric connection point, effectively prevents electric connection point fracture sealing-off.Outer tube 1 and intervalve 2 are as two testing electrodes of main capacitance formula sensor, also be provided with a sub-capacitive transducer, the structure of sub-capacitive transducer comprises: in intervalve 2, be also provided with an interior pipe 8, one end of interior pipe 8 is arranged on major insulation support block 31, the other end of interior pipe 8 is connected in intervalve 2 by interior dielectric support block 32 insulating supporting, interior pipe 8 is provided with the inner via hole 81 that at least one passes in and out for LNG Liquefied natural gas, the metal screen layer 71 that son draws wire 62 is electrically connected with outer tube 1, the metal core wire 63 that son draws wire 62 is electrically connected with interior pipe 8, make outer tube 1 and interior pipe 8 as two testing electrodes of sub-capacitive transducer, and the length of interior pipe 8 is no more than 3/4ths of intervalve 2 length, in being preferably, the length of pipe 8 is no more than 1/2nd of intervalve 2 length, the length being more preferably interior pipe 8 is no more than 1/3rd of intervalve 2 length, to ensure that toward in basin during filling LNG Liquefied natural gas, sub-capacitive transducer can be filled and first be full of LNG Liquefied natural gas than main capacitance formula sensor.
When reality uses, the primary and secondary capacitive transducer of interior ring structure of the present invention is installed in basin, and make interior pipe 8 be positioned at tank bottom, can guarantee like this each filling time, sub-capacitive transducer can be filled and first be filled LNG Liquefied natural gas than main capacitance formula sensor all the time.Signal processor in Level meter first stores fully loaded Capacity CD when sub-capacitive transducer is filled LNG Liquefied natural gas D; When each filling use, signal processor collection the fully loaded Capacity CA stored when sub-capacitive transducer is filled other LNG Liquefied natural gas, and Capacity CA and CD is made comparisons, obtain the value t reacting electric capacitance change ratio, signal processor recycling t goes the Capacity adjusting main capacitance formula sensor, thus the measuring accuracy of liquid level can be improved, substantially reduce measurement error.Or, utilize during each filling LNG of sub-capacitive transducer and can guarantee first to be full of, thus calculate at every turn the permittivity of filling LNG Liquefied natural gas, thus the fully loaded Capacity that can calculate exactly in advance when each reality of main capacitance formula sensor uses, can improve measuring accuracy equally, reduce measurement error.
Claims (5)
1. the primary and secondary capacitive transducer of ring structure in, comprise: main capacitance formula sensor, the structure of main capacitance formula sensor comprises: outer tube and the intervalve being arranged in outer tube, the two ends of intervalve are connected in outer tube respectively by major insulation support block insulating supporting, outer tube and intervalve are respectively arranged with at least one through hole passed in and out for LNG Liquefied natural gas, the metal screen layer of main extraction wire is electrically connected with outer tube, the metal core wire of main extraction wire is electrically connected with intervalve, makes outer tube and intervalve as two testing electrodes of main capacitance formula sensor; It is characterized in that: be also provided with a sub-capacitive transducer, the structure of sub-capacitive transducer comprises: be also provided with in intervalve in one and manage, one end of interior pipe is arranged on the major insulation support block of one end, the other end of interior pipe is connected in intervalve by interior dielectric support block insulating supporting, interior pipe is provided with the inner via hole that at least one passes in and out for LNG Liquefied natural gas, the metal screen layer that son draws wire is electrically connected with outer tube, son is drawn the metal core wire of wire and is electrically connected with interior pipe, makes outer tube and interior pipe as two testing electrodes of sub-capacitive transducer; And the length of interior pipe is no more than 3/4ths of intervalve length.
2. the primary and secondary capacitive transducer of interior ring structure according to claim 1, is characterized in that: the length of interior pipe is no more than 1/2nd of intervalve length.
3. the primary and secondary capacitive transducer of interior ring structure according to claim 1, is characterized in that: the length of interior pipe is no more than 1/3rd of intervalve length.
4. according to claim 1 or 2 or 3, the primary and secondary capacitive transducer of ring structure, is characterized in that: outside major insulation support block, be coated with the end cap seat welded mutually with outer tube.
5. the primary and secondary capacitive transducer of ring structure according to claim 1 or 2 or 3, it is characterized in that: in intervalve, be welded with electrode plate, the metal core wire of main extraction wire is electrically connected with electrode plate by screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135439.0A CN103216727B (en) | 2013-04-18 | 2013-04-18 | Primary and secondary capacitance-type sensor with inner ring structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310135439.0A CN103216727B (en) | 2013-04-18 | 2013-04-18 | Primary and secondary capacitance-type sensor with inner ring structure |
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| CN103216727A CN103216727A (en) | 2013-07-24 |
| CN103216727B true CN103216727B (en) | 2015-04-08 |
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| CN110879093A (en) * | 2019-10-14 | 2020-03-13 | 北京航天试验技术研究所 | Vehicle-mounted liquid hydrogen liquid level measuring device and liquid level meter comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168511A (en) * | 1980-05-30 | 1981-12-24 | Toshiba Corp | Induction type liquid level detector |
| JPH0953973A (en) * | 1995-08-11 | 1997-02-25 | Kansai Ootomeishiyon Kk | Level sensor |
| FR2932564A1 (en) * | 2008-06-17 | 2009-12-18 | Systemes Electroniques De Mesu | Capacitive liquid level transmitter sensor for e.g. electricity conductive liquid in automobile field, has substrate on which bipolar electrodes constituted of segments modulated in length, width, number and space are integrated |
| CN101762304A (en) * | 2008-11-12 | 2010-06-30 | 张家港富瑞特种装备股份有限公司 | Content gauge |
| CN202362049U (en) * | 2011-10-21 | 2012-08-01 | 成都兰石低温科技有限公司 | Dual concentric capacitive sensor for liquefied gas |
| CN102680052B (en) * | 2012-05-10 | 2013-10-30 | 苏州赛智达智能科技有限公司 | Connecting structure of leading-out lead of capacitive low-temperature liquid level meter |
| CN202791328U (en) * | 2012-08-20 | 2013-03-13 | 张家港保税区美达电子电脑有限公司 | Capacitance-type low-temperature liquid level sensor |
| CN203258368U (en) * | 2013-04-18 | 2013-10-30 | 苏州赛智达智能科技有限公司 | Primary-secondary capacitive sensor with inner ring structure |
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