CN103196037B - Internally integral primary-secondary capacitance type sensor - Google Patents
Internally integral primary-secondary capacitance type sensor Download PDFInfo
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- CN103196037B CN103196037B CN201310135474.2A CN201310135474A CN103196037B CN 103196037 B CN103196037 B CN 103196037B CN 201310135474 A CN201310135474 A CN 201310135474A CN 103196037 B CN103196037 B CN 103196037B
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- natural gas
- capacitive transducer
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Abstract
The invention discloses an internally integral primary-secondary capacitance type sensor applicable to a liquid level detecting instrument. The internally integral primary-secondary capacitance type sensor comprises an outer tube, wherein a first inner tube and a second inner tube connected with each other in an insulating support manner are arranged inside the outer tube; the outer ends of the first and second inner tubes are respectively connected into the outer tube in an insulating support manner through a main insulating support block; the length of the second inner tube is not more than one half of the length of the first inner tube; the outer tube and the first inner tube are respectively provided with at least one through hole; the outer tube and the second inner tube are respectively provided with at least one through hole; and therefore, the outer tube and the first inner tube become two detection electrodes of a primary capacitance type sensor, and the outer tube and the second inner tube become two detection electrodes of a secondary capacitance type sensor. By virtue of the primary-secondary capacitance type sensor, the measurement accuracy of detecting a liquefied natural gas liquid level by the liquid level detecting instrument can be improved, and measurement errors are 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 built-in one 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 built-in one, comprise outer tube, be characterized in: be provided with in outer tube mutually insulated support and connection first in pipe and second in manage, in first, in pipe and second, the outer end of pipe is connected in outer tube respectively by one piece of major insulation support block insulating supporting, in second, the length of pipe is no more than 1/2nd of the first inner tube length, pipe is respectively arranged with the through hole that at least one passes in and out for LNG Liquefied natural gas in outer tube and first, pipe is respectively arranged with the through hole that at least one passes in and out for LNG Liquefied natural gas in outer tube and second, 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 pipe in first, pipe in outer tube and first is made to become two testing electrodes of main capacitance formula sensor, son is drawn the metal screen layer of wire and be electrically connected with outer tube, and the metal core wire of sub-extraction wire is electrically connected with pipe in second, to make in outer tube and second pipe as two testing electrodes of sub-capacitive transducer.
Further, the primary and secondary capacitive transducer of aforesaid built-in one, wherein, in second, the length of pipe is no more than 1/3rd of the first inner tube length.
Further, the primary and secondary capacitive transducer of aforesaid built-in one, 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 built-in one, wherein, is welded with the first electrode plate in first in pipe, and the metal core wire of main extraction wire is electrically connected with the first electrode plate by the first screw; In second, be welded with the second electrode plate in pipe, the metal core wire that son draws wire is electrically connected with the second electrode plate by the second 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 built-in one of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the primary and secondary capacitive transducer to built-in one of the present invention is further described.
Shown in Figure 1, the primary and secondary capacitive transducer of built-in one of the present invention, comprise outer tube 1, be provided with in outer tube 1 support and connection of dielectric support block 32 mutually insulated first in pipe 21 in pipe 2 and second, in first, the outer end of pipe 2 is connected in outer tube 1 by one piece of major insulation support block 3 insulating supporting, the end cap seat 4 welded mutually with outer tube 1 is coated with outside major insulation support block 3, in second, the outer end of pipe 21 is connected in outer tube 1 by one piece of major insulation support block 31 insulating supporting, 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, on the other hand major insulation support block 3 and 31 is installed more reliable firm, in second, the length of pipe 21 is no more than 1/2nd of pipe 2 length in first, the length being preferably pipe 21 in second is no more than 1/3rd of pipe 2 length in first, 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.The one end part of outer tube 1 is provided with at least one through hole 11 passed in and out for LNG Liquefied natural gas, in first, the two-end part of pipe 2 is respectively arranged with the through hole 22 that at least one passes in and out for LNG Liquefied natural gas, LNG Liquefied natural gas can enter the gap of pipe 2 in outer tube 1 and first from through hole 11, then enters the inner chamber of pipe 2 in first from through hole 22; The through hole 12 that at least one passes in and out for LNG Liquefied natural gas is provided with at the other end position of outer tube 1, in second, the two-end part of pipe 21 is respectively arranged with the through hole 23 that at least one passes in and out for LNG Liquefied natural gas, LNG Liquefied natural gas can enter the gap of pipe 21 in outer tube 1 and second from through hole 12, then enters the inner chamber of pipe 21 in second from through hole 23; 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 pipe in first 2---in first, be welded with the first electrode plate 5 in pipe 2 in the present embodiment, the metal core wire 61 of main extraction wire 6 and isolation layer thereof are together successively through after taper plug, end cap seat 4 and major insulation support block 3, metal core wire 61 is electrically connected with the first electrode plate 5 by the first screw 8, thus guarantee that metal core wire 61 is connected with the first electrode plate 5 is reliable and stable, make pipe 2 in outer tube 1 and first become two testing electrodes of main capacitance formula sensor; 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.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 pipe in second 21---in second, be welded with the second electrode plate 51 in pipe 21 in the present embodiment, the metal core wire 63 of son extraction wire 62 and isolation layer thereof are successively through outer tube 1, in first after pipe 2 and dielectric support block 32, metal core wire 63 is electrically connected with the second electrode plate 51 by the second screw 81, thus guarantee that metal core wire 63 is connected with the second electrode plate 51 is reliable and stable, to make in outer tube 1 and second pipe 21 as two testing electrodes of sub-capacitive transducer.
When reality uses, the primary and secondary capacitive transducer of built-in one of the present invention is installed in basin, and make pipe 21 in second 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 (3)
1. the primary and secondary capacitive transducer of built-in one, comprise outer tube, it is characterized in that: be provided with in outer tube mutually insulated support and connection first in pipe and second in manage, in first, in pipe and second, the outer end of pipe is connected in outer tube respectively by one piece of major insulation support block insulating supporting, in second, the length of pipe is no more than 1/3rd of the first inner tube length, pipe is respectively arranged with the through hole that at least one passes in and out for LNG Liquefied natural gas in outer tube and first, pipe is respectively arranged with the through hole that at least one passes in and out for LNG Liquefied natural gas in outer tube and second, 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 pipe in first, pipe in outer tube and first is made to become two testing electrodes of main capacitance formula sensor, son is drawn the metal screen layer of wire and be electrically connected with outer tube, and the metal core wire of sub-extraction wire is electrically connected with pipe in second, to make in outer tube and second pipe as two testing electrodes of sub-capacitive transducer, make pipe in second be positioned at tank bottom during use, with guarantee 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.
2. the primary and secondary capacitive transducer of built-in one according to claim 1, is characterized in that: outside major insulation support block, be coated with the end cap seat welded mutually with outer tube.
3. the primary and secondary capacitive transducer of built-in one according to claim 1, is characterized in that: in first, be welded with the first electrode plate in pipe, and the metal core wire of main extraction wire is electrically connected with the first electrode plate by the first screw; In second, be welded with the second electrode plate in pipe, the metal core wire that son draws wire is electrically connected with the second electrode plate by the second screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135474.2A CN103196037B (en) | 2013-04-18 | 2013-04-18 | Internally integral primary-secondary capacitance type sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310135474.2A CN103196037B (en) | 2013-04-18 | 2013-04-18 | Internally integral primary-secondary capacitance type sensor |
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| Publication Number | Publication Date |
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| CN103196037A CN103196037A (en) | 2013-07-10 |
| CN103196037B true CN103196037B (en) | 2015-04-08 |
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| CN201310135474.2A Active CN103196037B (en) | 2013-04-18 | 2013-04-18 | Internally integral primary-secondary capacitance type sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105387909B (en) * | 2015-11-01 | 2018-10-02 | 四川泛华航空仪表电器有限公司 | Voltage output mode fuel-quantity transducer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179828A (en) * | 1995-03-29 | 1998-04-22 | 戴姆勒－奔驰公司 | Sensor arrangement |
| WO2003023331A1 (en) * | 2001-08-30 | 2003-03-20 | C.O.B.O. Spa | Capacitive liquid level measurement using a reference sensor |
| CN1651872A (en) * | 2004-02-02 | 2005-08-10 | 戴烨 | Three-parameter integration capacitance sensor for automobile fuel oil meter |
| 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 |
| CN102680052A (en) * | 2012-05-10 | 2012-09-19 | 张家港市赛达机械有限公司 | Connecting structure of leading-out lead of capacitive low-temperature liquid level meter |
| CN202886318U (en) * | 2012-11-05 | 2013-04-17 | 成都兰石低温科技有限公司 | Three-wire double-capacitor transducer |
| CN203258369U (en) * | 2013-04-18 | 2013-10-30 | 苏州赛智达智能科技有限公司 | Built-in integrated primary-secondary capacitive sensor |
-
2013
- 2013-04-18 CN CN201310135474.2A patent/CN103196037B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179828A (en) * | 1995-03-29 | 1998-04-22 | 戴姆勒－奔驰公司 | Sensor arrangement |
| WO2003023331A1 (en) * | 2001-08-30 | 2003-03-20 | C.O.B.O. Spa | Capacitive liquid level measurement using a reference sensor |
| CN1651872A (en) * | 2004-02-02 | 2005-08-10 | 戴烨 | Three-parameter integration capacitance sensor for automobile fuel oil meter |
| 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 |
| CN102680052A (en) * | 2012-05-10 | 2012-09-19 | 张家港市赛达机械有限公司 | Connecting structure of leading-out lead of capacitive low-temperature liquid level meter |
| CN202886318U (en) * | 2012-11-05 | 2013-04-17 | 成都兰石低温科技有限公司 | Three-wire double-capacitor transducer |
| CN203258369U (en) * | 2013-04-18 | 2013-10-30 | 苏州赛智达智能科技有限公司 | Built-in integrated primary-secondary capacitive sensor |
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