CN103353326A - Double-tube capacitive type liquid level sensor capable of preventing short circuiting - Google Patents
Double-tube capacitive type liquid level sensor capable of preventing short circuiting Download PDFInfo
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- CN103353326A CN103353326A CN2013102690030A CN201310269003A CN103353326A CN 103353326 A CN103353326 A CN 103353326A CN 2013102690030 A CN2013102690030 A CN 2013102690030A CN 201310269003 A CN201310269003 A CN 201310269003A CN 103353326 A CN103353326 A CN 103353326A
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Abstract
The invention discloses a double-tube capacitive type liquid level sensor capable of preventing short circuiting, which is used for detecting a liquid level of liquefied natural gas. The double-tube capacitive type liquid level sensor comprises an outer tube taken as a detection electrode, an inner tube and a lead-out wire, wherein two ends of the inner tube are connected into the outer tube through insulating and supporting blocks in an insulating and supporting manner respectively; an inner cavity of the inner tube forms an inner cavity of the capacitive type liquid level sensor; a gap is formed between the outer tube and the inner tube; at least one outer liquid inlet hole is formed in the outer tube, and at least one inner liquid inlet hole is formed in the inner tube; liquefied natural gas can enter the gap from the outer liquid inlet hole and then enters the inner cavity of the capacitive type liquid level sensor from the inner liquid inlet hole; and an insulation layer which can prevent the outer tube and the inner tube from short circuiting due to impurities is arranged on at least one tube wall of the inner wall of the outer tube and the outer wall of the inner tube, and the insulation layer doesn't shield the liquid inlet holes on the tubes.
Description
Technical field
The present invention relates to the double-tube type capacitance level transducer for detection of the liquefied natural gas (LNG) liquid level.
Background technology
At present, liquefied natural gas (LNG) is more and more extensive as its application of a kind of clean energy resource, is being used for liquefying, stores, in the container of transportation and can liquefied natural gas (LNG), usually all detecting the liquid level of liquefied natural gas (LNG) with capacitance level transducer.The structure of double-tube type capacitance level transducer commonly used is at present: comprise outer tube, the inner tube as detecting electrode and draw wire, the two ends of inner tube are connected in the outer tube by the dielectric support block insulating supporting respectively, dielectric support block also is coated with the end cap seat that welds mutually with outer tube outward, interior tube cavity consists of the capacitance level transducer inner chamber, between outer tube and inner tube, be provided with the gap, inlet opening outside outer tube offers at least one offers inlet opening at least one on inner pipe; Liquefied natural gas (LNG) can enter in the gap by outer inlet opening, is entered in the capacitance level transducer inner chamber by interior inlet opening again.
The shortcoming that the capacitance level transducer of said structure exists is: owing to always can have impurity inevitably in the liquefied natural gas (LNG), impurity is easy to enter in the gap between outer tube and the inner tube by outer inlet opening, again because the gap between outer tube and the inner tube is usually very small, impurity is easy to cause outer tube and the mutual short circuit of inner tube, finally cause capacitance level transducer to be measured inaccurate, even sensor failure.Because capacitance level transducer is installed in the low temperature storage tank of sealing, almost can't keep in repair, this can cause scrapping of whole low temperature storage tank, seems particularly important so prevent outer tube and the mutual short circuit of inner tube.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of anti-short circuit double-tube type capacitance level transducer that can prevent outer tube and the mutual short circuit of inner tube.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme.
Anti-short circuit double-tube type capacitance level transducer, comprise outer tube, the inner tube as detecting electrode and draw wire, the two ends of inner tube are connected in the outer tube by the dielectric support block insulating supporting respectively, interior tube cavity consists of the capacitance level transducer inner chamber, between outer tube and inner tube, be provided with the gap, inlet opening outside outer tube offers at least one offers inlet opening at least one on inner pipe; Liquefied natural gas (LNG) can enter in the gap by outer inlet opening, is entered in the capacitance level transducer inner chamber by interior inlet opening again; Be characterized in: be provided with at least one tube wall in wall or the outer wall of inner tube within the outer tube and can effectively stop outer tube and inner tube because of the insulation course of impurity short circuit, insulation course does not cover the inlet opening on the pipe of place.
Further, aforesaid anti-short circuit double-tube type capacitance level transducer, wherein: described insulation course is the teflon sleeve that is sleeved on the outer wall of inner tube.
Further, aforesaid anti-short circuit double-tube type capacitance level transducer, wherein: described insulation course is the polytetrafluorethylecoatings coatings that is arranged on the outer tube wall.
Beneficial effect of the present invention: insulation course has been stopped between outer tube and the inner tube effectively because the impurity short circuit is arranged, thereby has reduced the generation that capacitance level transducer is measured inaccurate and sensor failure phenomenon.
Description of drawings
Fig. 1 is the structural representation of a kind of preferred embodiment of anti-short circuit double-tube type capacitance level transducer of the present invention.
Fig. 2 is the structural representation of anti-short circuit double-tube type capacitance level transducer the second of the present invention preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment anti-short circuit double-tube type capacitance level transducer of the present invention is further described.
Referring to shown in Figure 1, anti-short circuit double-tube type capacitance level transducer of the present invention, comprise the outer tube 1 as detecting electrode, inner tube 2 and draw wire 8, the two ends of inner tube 2 are respectively by first, the second dielectric support block 3 and 31 insulating supportings are connected in the outer tube 1, the first dielectric support block 3 outer first end cages 7 that weld mutually with outer tube 1 that also are coated with, the second dielectric support block 31 outer the second end cap seats 71 that weld mutually with outer tube 1 that also are coated with, inner tube 2 inner chambers consist of capacitance level transducer inner chamber 4, between outer tube 1 and inner tube 2, be provided with gap 5, offer inlet opening 11 outside at least one at outer tube 1, offer inlet opening 21 at least one in inner tube 2; Liquefied natural gas (LNG) can enter in the gap 5 by outer inlet opening 11, is entered in the capacitance level transducer inner chamber 4 by interior inlet opening 21 again; Be provided with at outer tube 1 inwall and can effectively stop outer tube 1 and inner tube 2 because of the insulation course 9 of impurity short circuit, insulation course 9 does not cover the outer inlet opening 11 on the outer tube 1, and described insulation course 9 is for being arranged on the polytetrafluorethylecoatings coatings on outer tube 1 inwall.
Referring to shown in Figure 2, anti-short circuit double-tube type capacitance level transducer of the present invention, comprise the outer tube 1 as detecting electrode, inner tube 2 and draw wire 8, the two ends of inner tube 2 are respectively by first, the second dielectric support block 3 and 31 insulating supportings are connected in the outer tube 1, the first dielectric support block 3 outer first end cages 7 that weld mutually with outer tube 1 that also are coated with, the second dielectric support block 31 outer the second end cap seats 71 that weld mutually with outer tube 1 that also are coated with, inner tube 2 inner chambers consist of capacitance level transducer inner chamber 4, between outer tube 1 and inner tube 2, be provided with gap 5, offer inlet opening 11 outside at least one at outer tube 1, offer inlet opening 21 at least one in inner tube 2; Liquefied natural gas (LNG) can enter in the gap 5 by outer inlet opening 11, is entered in the capacitance level transducer inner chamber 4 by interior inlet opening 21 again; Be provided with at inner tube 2 outer walls and can effectively stop outer tube 1 and inner tube 2 because of the insulation course 6 of impurity short circuit, insulation course 6 does not cover the interior inlet opening 21 on the inner tube 2, and described insulation course 6 is for being sleeved on the teflon sleeve on inner tube 2 outer walls.
During practical application, also can insulation course be set and at inner tube 2 outer walls insulation course be set at outer tube 1 inwall simultaneously, or only near the bottom position place insulation course is set at outer tube 1 inwall, or only near the bottom position place insulation course is set at inner tube 2 outer walls.The variation of the set-up mode of above-mentioned these insulation courses all should belong to protection scope of the present invention.
During use, anti-short circuit double-tube type capacitance level transducer of the present invention vertically is placed in the container of liquefaction, storage, transportation and can liquefied natural gas (LNG), the impurity such as the iron filings in the liquefied natural gas (LNG) can enter in the gap 5 between outer tube 1 and the inner tube 2 by outer inlet opening 11, finally can be deposited in the bottom in gap 5, the insulation course that arranges among the present invention has been stopped between outer tube 1 and the inner tube 2 effectively because the impurity short circuit is arranged, thereby has greatly reduced the generation that capacitance level transducer is measured inaccurate and sensor failure phenomenon.
Claims (3)
1. prevent short circuit double-tube type capacitance level transducer, comprise outer tube, the inner tube as detecting electrode and draw wire, the two ends of inner tube are connected in the outer tube by the dielectric support block insulating supporting respectively, interior tube cavity consists of the capacitance level transducer inner chamber, between outer tube and inner tube, be provided with the gap, inlet opening outside outer tube offers at least one offers inlet opening at least one on inner pipe; Liquefied natural gas (LNG) can enter in the gap by outer inlet opening, is entered in the capacitance level transducer inner chamber by interior inlet opening again; It is characterized in that: be provided with at least one tube wall in wall or the outer wall of inner tube within the outer tube and can effectively stop outer tube and inner tube because of the insulation course of impurity short circuit, insulation course does not cover the inlet opening on the pipe of place.
2. anti-short circuit double-tube type capacitance level transducer according to claim 1, it is characterized in that: described insulation course is the teflon sleeve that is sleeved on the outer wall of inner tube.
3. anti-short circuit double-tube type capacitance level transducer according to claim 1, it is characterized in that: described insulation course is the polytetrafluorethylecoatings coatings that is arranged on the outer tube wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102690030A CN103353326A (en) | 2013-07-01 | 2013-07-01 | Double-tube capacitive type liquid level sensor capable of preventing short circuiting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102690030A CN103353326A (en) | 2013-07-01 | 2013-07-01 | Double-tube capacitive type liquid level sensor capable of preventing short circuiting |
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| CN103353326A true CN103353326A (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013102690030A Pending CN103353326A (en) | 2013-07-01 | 2013-07-01 | Double-tube capacitive type liquid level sensor capable of preventing short circuiting |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948928A (en) * | 2006-11-02 | 2007-04-18 | 青岛澳波泰克安全设备有限责任公司 | Novel capacitive type miniature liquid level measuring gauge |
| CN102606877A (en) * | 2012-03-31 | 2012-07-25 | 贾林祥 | Liquid level measuring device of liquefied natural gas cylinder |
| CN202974385U (en) * | 2012-12-13 | 2013-06-05 | 上海朝辉压力仪器有限公司 | Capacitance liquid level transmitter |
| CN203376026U (en) * | 2013-07-01 | 2014-01-01 | 苏州赛智达智能科技有限公司 | Capacitance type liquid level sensor capable of preventing short circuit and provided with two tubes |
-
2013
- 2013-07-01 CN CN2013102690030A patent/CN103353326A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948928A (en) * | 2006-11-02 | 2007-04-18 | 青岛澳波泰克安全设备有限责任公司 | Novel capacitive type miniature liquid level measuring gauge |
| CN102606877A (en) * | 2012-03-31 | 2012-07-25 | 贾林祥 | Liquid level measuring device of liquefied natural gas cylinder |
| CN202974385U (en) * | 2012-12-13 | 2013-06-05 | 上海朝辉压力仪器有限公司 | Capacitance liquid level transmitter |
| CN203376026U (en) * | 2013-07-01 | 2014-01-01 | 苏州赛智达智能科技有限公司 | Capacitance type liquid level sensor capable of preventing short circuit and provided with two tubes |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131016 |