CN204165616U - A kind of sectional capacitor type liquid level gauge for LNG storage tank - Google Patents
A kind of sectional capacitor type liquid level gauge for LNG storage tank Download PDFInfo
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- CN204165616U CN204165616U CN201420659205.6U CN201420659205U CN204165616U CN 204165616 U CN204165616 U CN 204165616U CN 201420659205 U CN201420659205 U CN 201420659205U CN 204165616 U CN204165616 U CN 204165616U
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- liquid level
- storage tank
- level gauge
- type liquid
- capacitor type
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Abstract
The utility model discloses a kind of sectional capacitor type liquid level gauge for LNG storage tank, comprise interior pipe, coaxially be coated at the outer tube of interior pipe, bottom the connection of fixing described inner and outer tubes, described connection bottom is in storage tank bottom, the described bottom that connects comprises the insulation swivel nut that its threaded portion and inner tube wall be spirally connected, the rigid base of fixing described insulation swivel nut, described rigid base nearside wheel connects insulation swivel nut, outboard wheel connects outer pipe bottom, described interior pipe is divided into coaxially and the multistage engaged, in every section, the internal diameter of pipe is identical, external diameter is that notch cuttype increases progressively from top to bottom.The utility model can improve the sensitivity that liquid level is measured, and prevents from producing short circuit phenomenon between inner and outer tubes.
Description
Technical field
The utility model relates to the liquid level gauge for measuring height of liquid level in LNG (liquefied natural gas (LNG)) storage tank, particularly a kind of sectional capacitor type liquid level gauge for LNG storage tank.
Background technology
Liquefied Natural Gas fuel cost is low, and wherein principal ingredient is methane, and after burning, objectionable constituent are less, uses comparatively extensive in large-scale heavy goods vehicles as the fuel of engine.In numerous kinds of liquid level gauges, because the performance of capacitance level gauge is comparatively stable, install also very convenient, be generally used in measurement LNG storage tank liquid level.For capacitance level gauge, need to measure the capacitance variations between inner and outer tubes, must insulate between inner and outer tubes, according to cylindrical capacitive formula, the spacing of liquid level gauge inner and outer tubes is less, the electric capacity of gained is larger, the resolution that liquid level is measured is also larger, if but two tube wall spacing are too small, be easy to make liquid level increase along wall because of capillarity, affect the accuracy of level gauging, even may because impurity causes the short circuit of inside and outside tube wall, thus inner and outer tubes spacing cannot be accomplished very little, cause capacitance variations sensitive not to liquid level change perception.
Utility model content
The purpose of this utility model is to provide a kind of sectional capacitor type liquid level gauge for LNG storage tank, can improve the sensitivity that liquid level is measured, prevent from producing short circuit phenomenon between inner and outer tubes.
In order to solve the problems of the technologies described above, the utility model adopts technical scheme: a kind of sectional capacitor type liquid level gauge for LNG storage tank, comprise interior pipe, coaxially be coated at the outer tube of interior pipe, bottom the connection of fixing described inner and outer tubes, described connection bottom is in storage tank bottom, the described bottom that connects comprises the insulation swivel nut that its threaded portion and inner tube wall be spirally connected, the rigid base of fixing described insulation swivel nut, described rigid base nearside wheel connects insulation swivel nut, outboard wheel connects outer pipe bottom, described interior pipe is divided into coaxially and the multistage engaged, in every section, the internal diameter of pipe is identical, external diameter is that notch cuttype increases progressively from top to bottom.
According to an embodiment of the present utility model, the outer wall of at least one section of described interior pipe from bottom establishes insulating medium cover, and described insulating medium cover extends to described insulation swivel nut base edge, by liquid between described insulating medium cover and outer tube wall.
According to an embodiment of the present utility model, the material of described insulating medium cover is high K (high dielectric radio) dielectric material.
According to an embodiment of the present utility model, the syndeton between described rigid base outboard wheel and nearside wheel be provided with for liquid pass into outer tube and insulating medium overlap between opening.
According to an embodiment of the present utility model, packing washer is established in the junction of described insulation swivel nut and rigid base.
According to an embodiment of the present utility model, the material of described insulation swivel nut is teflon.
According to an embodiment of the present utility model, also comprise and be positioned at storage tank top and the connection header stretching out in the connection inner and outer tubes outside storage tank.
According to an embodiment of the present utility model, wear cable in described connection header, cable receives the signal of inner and outer tubes, and cable stretches out connection header and transmit this signal outward.
According to an embodiment of the present utility model, described cable outer cladding protective sleeve, fills with silica gel between described protective sleeve and described connection header.
After adopting technique scheme, the utility model compared with prior art has following outstanding advantages: when LNG liquid level is lower, require higher to the measurement of liquid level change, the present invention is that notch cuttype increases progressively by being set to by the external diameter of interior pipe from top to bottom, interior pipe can be regarded as multistage joint and form, in the capacitance equation of every section, the ratio of inside and outside caliber is all different, the inside and outside caliber of bottom is than maximum (in outer, caliber is than minimum), capacitance variations is highly sensitive to liquid level change perception, and due to length after segmentation shorter, not easily cause capillarity, compare caliber spacing inside and outside existing liquid level gauge, it is less that bottom inner and outer pipes spacing can be done by the present invention, the sensitivity that liquid level is measured can be improved.
In addition, the outer wall of at least one section of interior pipe from bottom establishes insulating medium cover, when liquid level rises, should due to the increase of specific inductive capacity thus to make corresponding capacitance change faster between (these) section inner and outer tubes, the sensitivity of capacitance variations to liquid level change perception is further enhanced, and prevents from producing short circuit phenomenon between inner and outer tubes simultaneously.
Accompanying drawing explanation
Fig. 1 is the partial cutaway schematic of a kind of sectional capacitor type liquid level gauge for LNG storage tank of the utility model embodiment;
Fig. 2 is the schematic top plan view bottom the connection of a kind of sectional capacitor type liquid level gauge for LNG storage tank of the utility model embodiment.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the utility model.But the utility model can be much different from alternate manner described here to implement, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public concrete enforcement and concrete accompanying drawing.
A kind of sectional capacitor type liquid level gauge for LNG storage tank of the present utility model, comprises interior pipe 1, is coaxially coated at the outer tube 2 of interior pipe 1, and bottom the connection of fixing described interior pipe 1 and outer tube 2, described connection bottom is in storage tank bottom.Fig. 1 is the partial schematic diagram bottom the connection of the present embodiment liquid level gauge bottom, the described bottom that connects comprises the insulation swivel nut 3 that its threaded portion and interior pipe 1 inwall be spirally connected, the rigid base 4 of fixing described insulation swivel nut 3, described rigid base 4 nearside wheel connects insulation swivel nut 3, outboard wheel connects bottom outer tube 2, described interior pipe 1 outer wall establishes insulating medium to overlap 5, the outer wall of interior pipe is set to stepped shape, to top from bottom, interior pipe external diameter successively decreases piecemeal, namely interior pipe 1 be divide into multistage, in other words, described interior pipe 1 is divided into coaxially and the multistage engaged, in every section, the internal diameter of pipe 1 is identical, external diameter is that notch cuttype increases progressively from top to bottom.
Further, the length of each section is in increasing progressively from bottom to top, that is, more to that section on top can do to obtain long because more arrive top, inner and outer pipes spacing itself comparatively greatly, without the need to after many segmentations.
In cylindrical capacitive formula, known inside and outside caliber, dielectric permittivity, only there is liquid level independent variable, thus this computing formula is linear function, capacitance calculation in every section after segmentation between pipe 1 and outer tube 2 after entering liquid, from top to the slope of bottom be broken line upcurve, that is, same liquid level change, the capacitance variations produced between pipe 1 and outer tube 2 in every section is from the top to the bottom increasing trend.
Further, establish insulating medium to overlap 5 at the outer wall of at least one section of described interior pipe 1 from bottom, described insulating medium cover 5 extends to described insulation swivel nut 3 base edge, by liquid between described insulating medium cover 5 and outer tube 2 inwall.
When LNG enters between interior pipe 1 and outer tube 2 inwall, between the interior pipe 1 section of cover insulation medium socket 1 and outer tube 2 gained, the specific inductive capacity of medium is made up of insulating medium cover 5 and liquid two parts, existence due to insulating medium cover 5 is larger when making the capacity ratio naked medium socket 5 produced between this section of inner and outer pipes, liquid level gauge just can measure the change of less liquid level, and the amplitude that electric capacity increases is relevant with the specific inductive capacity that insulating medium overlaps 5.
The specific inductive capacity of insulating medium cover 5 is higher, between the interior pipe 1 section of cover insulation medium socket and outer tube 2, corresponding gained electric capacity is larger, preferably, the material of described insulating medium cover 5 is high K dielectric material, high K dielectric material is also known as high dielectric radio dielectric material, its ability of possessing electric charge is high, can stored charge better than other materials.
Insulating medium cover 5 is also in sectional type, and its internal diameter increases from the top to the bottom piecemeal, closes with diameter compatible, the combination of insulating medium cover 5 and pipe 1 in sectional type, and capacitance variations bottoms level change cause is faster, and detection liquid level changes sensitiveer.
Be enclosed within outside insulating medium cover 5 outside interior pipe 1, the convenience of installation can be made, firmly, insulating medium is longer than interior pipe 1 bottom overlapping 5 and the swivel nut 3 that will insulate is coated, syndeton is more fastening, during installation, first interior pipe 1 and insulation swivel nut 3 are screwed tight, then insulating medium is overlapped 5 overcoats, and it is closely engaged with insulation swivel nut 3 base edge, it should be noted that in the middle of insulation swivel nut 3 be empty, can liquid be passed through, in whole liquid level gauge, pipe 1 inside can pass in and out liquid, makes pressure equilibrium.
Understandable, insulating medium cover 5 also can be located on the inwall of outer tube 2, each section of pipe height summation in the length correspondence of insulating medium cover, the effect increasing corresponding capacitance can be played equally, the utility model considers that the fastening of syndeton is with convenient, only sets forth the embodiment be enclosed within interior pipe 1 outer wall outside insulating medium cover 5.
Referring to Fig. 2, the effect of pipe 1 and outer tube 2 in rigid base 4 plays and connects, rigid base 4 nearside wheel 41 connects insulation swivel nut 3, outboard wheel 42 connects bottom outer tube 2, need to ensure that liquid changes between corresponding turnover insulating medium cover 5 and outer tube 2 with liquid level simultaneously, thus the syndeton between described rigid base 4 outboard wheel 42 and nearside wheel 41 is provided with and passes into outer tube 2 and insulating medium for liquid and overlap opening 43 between 5, opening 43 shape does not limit, only need ensure the fastness that nearside wheel 41 is fixedly connected with outboard wheel 42, in the present embodiment, by contiguous block 44, nearside wheel 41 and outboard wheel 42 are coupled together.
Referring to Fig. 1, for prevent liquid enter insulating medium cover 5 and interior pipe 1 outer wall between, afterwards this liquid entered may retain certain hour wherein, affect the accuracy of level gauging, packing washer 6 is established in the junction of described insulation swivel nut 3 and rigid base 4, liquid is stoped to enter between insulating medium cover 5 and interior pipe 1 outer wall, when liquid enters between insulating medium cover 5 and outer tube 2 inwall, insulating medium can be overlapped 5 and press on interior pipe 1 by liquid.
Preferably, the material of described insulation swivel nut 3 is teflon.
For better fixing outer tube 2 and interior pipe 1, liquid level gauge also comprises and is positioned at storage tank top and the connection header (not shown) of the connection pipe 1 stretched out in outside storage tank and outer tube 2.
Further, wear cable in described connection header, the signal of pipe 1 and outer tube 2 in cable receives, interior pipe 1 connects cable core, and outer tube 2 connects cable screening wire, and cable stretches out connection header and transmit this signal outward.
Further, described cable outer cladding protective sleeve, fills with silica gel between described protective sleeve and described connection header, fixes cable, alleviate cable and tear wearing and tearing, extends liquid level gauge serviceable life.
When LNG liquid level is lower, require higher to the measurement of liquid level change, prior art takes identical measurement means to low liquid level and high liquid level, requirement is not reached for low liquid level measurement, the present invention is that notch cuttype increases progressively by being set to by the external diameter of interior pipe from top to bottom, interior pipe can be regarded as multistage joint and form, in the capacitance equation of every section, the ratio of inside and outside caliber is all different, the inside and outside caliber of bottom is than maximum (in outer, caliber is than minimum), capacitance variations is highly sensitive to liquid level change perception, and due to length after segmentation shorter, not easily cause capillarity, compare caliber spacing inside and outside existing liquid level gauge, it is less that bottom inner and outer pipes spacing can be done by the present invention, the sensitivity that liquid level is measured can be improved.
In addition, the outer wall of at least one section of interior pipe from bottom establishes insulating medium cover, when liquid level rises, should due to the increase of specific inductive capacity thus to make corresponding capacitance change faster between (these) section inner and outer tubes, the sensitivity of capacitance variations to liquid level change perception is further enhanced, and prevents from producing short circuit phenomenon between inner and outer tubes simultaneously.
Although the utility model with preferred embodiment openly as above; but it is not for limiting claim; any those skilled in the art are not departing from spirit and scope of the present utility model; can make possible variation and amendment, the scope that therefore protection domain of the present utility model should define with the utility model claim is as the criterion.
Claims (9)
1. the sectional capacitor type liquid level gauge for LNG storage tank, comprise interior pipe, coaxially be coated at the outer tube of interior pipe, bottom the connection of fixing described inner and outer tubes, described connection bottom is in storage tank bottom, it is characterized in that, the described bottom that connects comprises the insulation swivel nut that its threaded portion and inner tube wall are spirally connected, the rigid base fixing described insulation swivel nut, described rigid base nearside wheel connects insulation swivel nut, outboard wheel connects outer pipe bottom, described interior pipe is divided into the coaxial and multistage engaged, and in every section, identical, the external diameter of the internal diameter of pipe is that notch cuttype increases progressively from top to bottom.
2. as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, the outer wall of at least one section of described interior pipe from bottom establishes insulating medium cover, described insulating medium cover extends to described insulation swivel nut base edge, by liquid between described insulating medium cover and outer tube wall.
3. as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, the material of described insulating medium cover is high K dielectric material.
4., as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, the syndeton between described rigid base outboard wheel and nearside wheel be provided with for liquid pass into outer tube and insulating medium overlap between opening.
5., as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, packing washer is established in the junction of described insulation swivel nut and rigid base.
6., as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, the material of described insulation swivel nut is teflon.
7., as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, also comprise and be in storage tank top and the connection header stretching out in the connection inner and outer tubes outside storage tank.
8. as claimed in claim 1 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, wear cable in described connection header, cable receives the signal of inner and outer tubes, and cable stretches out connection header and transmit this signal outward.
9., as claimed in claim 8 for the sectional capacitor type liquid level gauge of LNG storage tank, it is characterized in that, described cable outer cladding protective sleeve, fills with silica gel between described protective sleeve and described connection header.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420659205.6U CN204165616U (en) | 2014-11-06 | 2014-11-06 | A kind of sectional capacitor type liquid level gauge for LNG storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420659205.6U CN204165616U (en) | 2014-11-06 | 2014-11-06 | A kind of sectional capacitor type liquid level gauge for LNG storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204165616U true CN204165616U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420659205.6U Expired - Fee Related CN204165616U (en) | 2014-11-06 | 2014-11-06 | A kind of sectional capacitor type liquid level gauge for LNG storage tank |
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| Country | Link |
|---|---|
| CN (1) | CN204165616U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459113A (en) * | 2018-12-28 | 2019-03-12 | 成都市美金迪不锈钢制品有限公司 | A kind of shell structure of LNG gas cylinder capacitance level transducer |
| 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 |
-
2014
- 2014-11-06 CN CN201420659205.6U patent/CN204165616U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459113A (en) * | 2018-12-28 | 2019-03-12 | 成都市美金迪不锈钢制品有限公司 | A kind of shell structure of LNG gas cylinder capacitance level transducer |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20181106 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |