CN204165617U - A kind of capacitance level gauge for LNG storage tank - Google Patents
A kind of capacitance level gauge for LNG storage tank Download PDFInfo
- Publication number
- CN204165617U CN204165617U CN201420659938.XU CN201420659938U CN204165617U CN 204165617 U CN204165617 U CN 204165617U CN 201420659938 U CN201420659938 U CN 201420659938U CN 204165617 U CN204165617 U CN 204165617U
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- CN
- China
- Prior art keywords
- storage tank
- level gauge
- swivel nut
- insulating medium
- lng storage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of capacitance 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 positioned at 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 outer wall of inner tube establishes insulating medium cover, described insulating medium cover surrounds described insulation swivel nut base edge, by liquid between described insulating medium cover and outer tube wall.The utility model can improve the sensitivity that liquid level is measured, and is convenient to signal transacting and display.
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 capacitance 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, more and more for measuring 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 cause the short circuit of inside and outside tube wall, thus inner and outer tubes spacing cannot be accomplished very little.
Utility model content
The purpose of this utility model is to provide a kind of capacitance level gauge for LNG storage tank, can improve the sensitivity that liquid level is measured, be convenient to signal transacting and display.
In order to solve the problems of the technologies described above, the utility model adopts technical scheme: a kind of capacitance 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 positioned at 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 outer wall of inner tube establishes insulating medium cover, described insulating medium cover surrounds 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: after overlapping by establishing insulating medium at outer wall of inner tube, when liquid level rises, due to the increase of specific inductive capacity corresponding gained electric capacity increased between inner and outer tubes, the rise electric capacity that causes of liquid level increases thus the resolution of level gauging is increased, less liquid level rises and also can be detected, and bulky capacitor signal more easily processes, be convenient to display, in addition, the insulation swivel nut connecting interior pipe also entangles by insulating medium cover, makes connection more fastening; Liquid enters from the opening of the rigid base of bottom, without the need to perforate on outer tube, still can be measured when also ensure that liquid level arrives bottom.
Accompanying drawing explanation
Fig. 1 is the partial schematic diagram of a kind of capacitance level gauge for LNG storage tank of the utility model embodiment;
Fig. 2 is the connection bottom schematic view of a kind of capacitance 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 capacitance 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 positioned at storage tank bottom.Fig. 1 is the partial schematic diagram that the present embodiment liquid level gauge lower end connects bottom, the described bottom that connects comprises the insulation swivel nut 3 that its threaded portion and interior pipe 1 inwall are spirally connected, the rigid base 4 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, described insulating medium cover 5 surrounds described insulation swivel nut 3 base edge, by liquid between described insulating medium cover 5 and outer tube 2 inwall.
When LNG enters in storage tank, liquid will when insulating medium overlaps between 5 and outer tube 2 inwall, between interior pipe 1 and outer tube 2, the specific inductive capacity of gained medium is made up of insulating medium cover 5 and liquid two parts, due to insulating medium cover 5 there is the capacity ratio naked medium socket 5 produced between inner and outer pipes time larger, be appreciated that, it is larger that identical liquid level change produces the capacitance variations caused, otherwise, same capacitance change can change acquisition by less liquid level, thus, liquid level gauge just can measure the change of less liquid level, the sensitivity of liquid level gauge is increased, 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, and between interior pipe 1 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, and its ability of possessing electric charge is high, can stored charge better than other materials.
Be enclosed within interior pipe 1 by closely outer for insulating medium cover 5, comparatively can overlay on outer tube wall on the one hand and save material cost, the convenience of installing can be made on the other hand with firm, insulating medium overlaps 5 length and is longer than interior pipe 1, interior pipe 1 and insulation swivel nut 3 all surround by insulating medium cover 5, syndeton is more fastening, during installation, first interior pipe 1 and insulation swivel nut 3 are screwed tight, cover insulating medium cover 5 more outside, closely engage with insulation swivel nut 3 base edge bottom insulating medium cover 5, it should be noted that, empty in the middle of insulation swivel nut 3, liquid can be passed through, in whole liquid level gauge, pipe 1 inside can pass in and out liquid, make pressure equilibrium.
Understandable, insulating medium cover 5 also can be located on the inwall of outer tube 2, can play the effect increasing corresponding capacitance 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 that the fastness that nearside wheel 41 and outboard wheel 42 are fixedly connected with and liquid can enter between outer tube 2 and insulating medium cover 5, in the present embodiment, by contiguous block 44, nearside wheel 41 and outboard wheel 42 are coupled together.
Referring to Fig. 1, the liquid enter between insulating medium cover 5 and interior pipe 1 outer wall for preventing liquid, causing this to enter may retain certain hour wherein thus affect the accuracy of level gauging, establish packing washer 6 in the junction of described insulation swivel nut 3 and rigid base 4, infiltrate between insulating medium cover 5 and interior pipe 1 outer wall for liquid.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, and it is more firm that its hardness can make liquid level gauge connect.
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.
The utility model by establish at outer wall of inner tube insulating medium overlap after, when liquid level rises, due to the increase of specific inductive capacity corresponding gained electric capacity increased between inner and outer tubes, the rise electric capacity that causes of liquid level increases thus the resolution of level gauging is increased, and less liquid level rising also can be detected, and bulky capacitor signal more easily processes, be convenient to display, in addition, the insulation swivel nut connecting interior pipe also entangles by insulating medium cover, makes connection more fastening; Liquid enters from the opening of the rigid base of bottom, without the need to perforate on outer tube, still can be measured when also ensure that liquid level arrives bottom.
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 (8)
1. the capacitance 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 positioned at 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 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 outer wall of inner tube establishes insulating medium cover, described insulating medium cover surrounds described insulation swivel nut base edge, by liquid between described insulating medium cover and outer tube wall.
2. as claimed in claim 1 for the capacitance level gauge of LNG storage tank, it is characterized in that, the material of described insulating medium cover is high K dielectric material.
3., as claimed in claim 1 for the capacitance 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.
4., as claimed in claim 1 for the capacitance 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.
5., as claimed in claim 1 for the capacitance level gauge of LNG storage tank, it is characterized in that, the material of described insulation swivel nut is teflon.
6., as claimed in claim 1 for the capacitance level gauge of LNG storage tank, it is characterized in that, 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.
7. as claimed in claim 6 for the capacitance 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.
8., as claimed in claim 7 for the capacitance 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 |
|---|---|---|---|
| CN201420659938.XU CN204165617U (en) | 2014-11-06 | 2014-11-06 | A kind of capacitance level gauge for LNG storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420659938.XU CN204165617U (en) | 2014-11-06 | 2014-11-06 | A kind of capacitance level gauge for LNG storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204165617U true CN204165617U (en) | 2015-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420659938.XU Expired - Fee Related CN204165617U (en) | 2014-11-06 | 2014-11-06 | A kind of capacitance level gauge for LNG storage tank |
Country Status (1)
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|---|---|
| CN (1) | CN204165617U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117869785A (en) * | 2024-03-11 | 2024-04-12 | 常熟理工学院 | Method and device for detecting quality of hydrogen fuel in liquid hydrogen storage tank in real time |
-
2014
- 2014-11-06 CN CN201420659938.XU patent/CN204165617U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117869785A (en) * | 2024-03-11 | 2024-04-12 | 常熟理工学院 | Method and device for detecting quality of hydrogen fuel in liquid hydrogen storage tank in real time |
| CN117869785B (en) * | 2024-03-11 | 2024-05-17 | 常熟理工学院 | Method and device for detecting quality of hydrogen fuel in liquid hydrogen storage tank in real time |
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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 |