CN203422136U - Capacitance type liquid level sensor - Google Patents
Capacitance type liquid level sensor Download PDFInfo
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- CN203422136U CN203422136U CN201320333614.2U CN201320333614U CN203422136U CN 203422136 U CN203422136 U CN 203422136U CN 201320333614 U CN201320333614 U CN 201320333614U CN 203422136 U CN203422136 U CN 203422136U
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Abstract
The utility model relates to a capacitance type liquid level sensor. The capacitance type liquid level sensor is characterized in that the capacitance type liquid level sensor comprises at least four metal pipes with different pipe diameters, an insulating base and an insulating upper cover, the metal pipes are vertically arranged and are arranged coaxially in a sleeved mode, the lower ends of the metal pipes are fixedly connected with the insulating base, the upper ends of the metal pipes are fixedly connected with the insulating upper cover, and gaps are formed between every two adjacent metal pipes; all metal pipes are divided into two groups to serve as a pair of pole plates of a capacitor, and the metal pipes in the same group are electrically connected to form a parallel capacitor with the large capacitance. When the liquid level changes, the change value of the capacitance is large, and therefore the sensitivity is high, the change of the liquid level can be truly and accurately reflected, and the precision of detecting the liquid level is improved.
Description
Technical field
The utility model relates to liquid level sensor, relates in particular to a kind of capacitance level transducer,
Liquid level for detection of the liquid medium of for example liquefied natural gas (LNG) and so on.
Background technology
Conventional liquid level sensor is mainly used in the remote continuous coverage of liquid level and the indication of various liquid, can adopt static pressure type level gauge can complete accurately measure for heavy liquid.But for the little liquid of proportion, as liquid hydrogen, liquefied natural gas (LNG), it is not much of that the precision of differential pressure levelmeter just seems, a kind of reasonable selection is exactly capacitance liquid level meter.
Traditional capacitance liquid level meter structure is: a metal tube and a metal bar are vertically arranged, coaxial package, two pole plates as capacitor, their two ends are fixedly connected with base, upper cover respectively, between metal tube and metal bar, form a constant volume space, fluid to be measured can enter this space, in space, be just filled with two media, bottom is fluid to be measured, and top is air, when liquid level generation eustasy, because the dielectric coefficient of fluid to be measured, air is different, the capacity of capacitor also just changes thereupon, therefore, can characterize liquid level by electric capacity.But the dielectric coefficient of liquid gas is all very little, the ε O=1.482 of liquid oxygen for example, ε N=1.432 of liquid nitrogen, the ε H=1.224 of liquid hydrogen, thus the capacitance change of sensor is very little, and the sensitivity of sensor is very low, resolution requirement to measurement mechanism postorder element is too high, general measure device is difficult to realize, and measuring accuracy is very low, causes measurement data can not reflect truly, exactly that liquid level changes.
Summary of the invention
The purpose of this utility model, it is the shortcoming that overcomes existing capacitance liquid level meter, a kind of highly sensitive capacitance level gauge is provided, its electric capacity is very large, when liquid level changes, the changing value of electric capacity is also very large, thereby highly sensitive, can reflect truly, exactly that liquid level changes, and improves liquid level accuracy of detection.
A kind of technical scheme of the present utility model is:
A kind of capacitance level transducer, it is characterized in that, comprise at least 4 metal tube, insulator foot, insulation upper covers that caliber is different, described metal tube is vertically arranged, coaxial package, their lower end is fixedly connected with insulator foot jointly, and upper end is fixedly connected with insulation upper cover jointly, gapped between adjacent metal pipe; All metal tubes are divided into two groups, and as a pair of pole plate of capacitor, metal tube is on the same group electrically connected to each other, and form a shnt capacitor, and this shnt capacitor has the electric wire of drawing; Described insulator foot or metal tube hypomere have with each pipe between the corresponding inlet opening in gap, described insulation upper cover or metal tube epimere have with each pipe between the corresponding vent port in gap.
The grouping scheme of described metal tube is, all metal tubes are alternate is divided into two groups, and as a pair of pole plate of capacitor, metal tube is on the same group electrically connected to each other, and forms a shnt capacitor; One utmost point ground connection (shell) of this shnt capacitor, another utmost point is drawn by drawing electric wire.Or
All metal tubes are pressed ecto-entad or the every two a pair of pole plates as capacitor of order from inside to outside, form a plurality of capacitors, and the same polarity pole plate of these capacitors is electrically connected to each other, and forms a shnt capacitor; When the quantity of metal tube is odd number, the remaining metal tube that divides into groups is incorporated to any utmost point of shnt capacitor; One utmost point ground connection (shell) of this shnt capacitor, another utmost point is drawn by drawing electric wire.
Described base is constituted by pedestal base insulation sleeve, inner tube lower end locating sleeve, and described inlet opening is opened on pedestal.
Described upper cover consists of core pipe box, inner tube upper end locating sleeve, insulator cap, outer, pipe upper end fixed cover, locking screw column combination, and described outer tube upper end fixed cover has and the internal thread of locking double-screw bolt adaptation.
Described vent port is opened upper and is covered, and this vent port runs through core pipe box, inner tube upper end locating sleeve, insulator cap, locking double-screw bolt, and gap between each pipe is communicated with space outerpace.
Described vent port is opened the epimere at metal tube, makes gap between all pipes become linker structure, and communicates with space outerpace.
The metal tube that is positioned at suit center is metal bar also.
On the inside and outside wall of described metal tube, be coated with insulation course.
Another kind of scheme of the present utility model is:
A kind of capacitance level transducer, comprise at least 4 calibers different metal tube, insulator foot, insulation upper cover, described metal tube is vertically arranged, coaxial package, their lower end is fixedly connected with insulator foot jointly, upper end is fixedly connected with insulation upper cover jointly, gapped between adjacent metal pipe, on described insulator foot, have with each pipe between the corresponding inlet opening in gap, described insulation upper cover or metal tube epimere have with each pipe between the corresponding vent port in gap, it is characterized in that, in described metal tube, having an inner sleeve is splitted structure, insulated from each other between lobe and lobe, each lobe is all as a pole plate of capacitor, on each pole plate, be all provided with one and draw electric wire, all termination parallel connections of drawing electric wire, all the other metal tubes are electrically connected to each other, another pole plate as capacitor, form a shnt capacitor.
The inner sleeve of described distinguish made progress to being divided into 2 lobes or being divided into 3 lobes in week.
Described base is constituted by pedestal, insulation sleeve, inner tube lower end locating sleeve, and described inlet opening is opened on pedestal.
Described upper cover consists of core pipe box, inner tube upper end locating sleeve, insulator cap, outer tube upper end fixed cover, locking screw column combination, and described outer tube upper end fixed cover has the internal thread with locking double-screw bolt adaptation.
Described vent port is opened upper and is covered, and this vent port runs through core pipe box, inner tube upper end locating sleeve, insulator cap, locking double-screw bolt, and gap between each pipe is communicated with space outerpace.
Described vent port is opened the epimere at metal tube, makes gap between all pipes become linker structure, and communicates with space outerpace.
The metal tube that is positioned at suit center is metal bar also.
The beneficial effects of the utility model: owing to adopting multitube sleeve structure, the polar plate area of the shnt capacitor forming increases, distance between pole plate is dwindled, electric capacity increases exponentially, when liquid level changes, the changing value of electric capacity is also large, thereby highly sensitive, with the measurement mechanism of conventional resolution, can reflect truly, exactly that liquid level changes, and improves liquid level accuracy of detection.
Accompanying drawing explanation
Fig. 1 is a kind of structural drawing of the present utility model
Fig. 2 is the cross-sectional view of Fig. 1
Fig. 3 is a kind of cross-sectional view of another kind of structure of the present utility model
Fig. 4 is another cross-sectional view of another kind of structure of the present utility model
Fig. 5 is liquid level schematic diagram in sensor
Code name implication in figure:
1-pedestal, 2-insulation sleeve, 3-axle core pipe (rod), 4-outer tube, 5-little inner tube, 6-large inner tube, 7-insulator cap, 8-locking double-screw bolt, 9-outer tube upper end locating sleeve, 10-cable gland, 11-cable, 12-cable core, 13-inlet opening, 14-vent port.
Embodiment
With two examples, describe the utility model in detail below.
Referring to Fig. 1, Fig. 2: in this example, sharing 4 different metal tubes of caliber vertically arranges, coaxial package, be outer tube 4, large inner tube 6, little inner tube 5, this axle core pipe of axle core pipe 3(is available metal rod also), their lower end is by insulation sleeve 2 insulation that is isolated from each other, and insulation sleeve 2 is fixed on pedestal 1, wherein, outer tube 4 directly and pedestal 1 be welded to connect; Their upper end is by insulator cap 7 insulation that is isolated from each other, wherein, outer tube 4 directly and outer tube upper end locating sleeve 9 be welded to connect, insulator cap 7 is in outer tube upper end locating sleeve 9, this outer tube upper end locating sleeve 9 has internal thread, by locking double-screw bolt 8 by insulator cap 7 all inner tubes be locked; Gapped between adjacent metal pipe; All metal tubes are divided into two groups, metal tube is on the same group electrically connected to each other, two pole plates as capacitor, form a shnt capacitor, during use, by constant-voltage DC source (not shown), by the heart yearn 12 of outgoing cable 11, connected the pole plate of this shnt capacitor, apply driving voltage, make it to there is electric capacity.
The grouping scheme of metal tube has following two kinds:
1, all metal tubes are alternate is divided into two groups, and as a pair of pole plate of capacitor, metal tube is on the same group electrically connected to each other, and forms a shnt capacitor; One utmost point ground connection (shell) at this shnt capacitor outer tube place, another utmost point is drawn by outgoing cable heart yearn 12.
2, all metal tubes are pressed ecto-entad or the every two a pair of pole plates as capacitor of order from inside to outside, form a plurality of capacitors, and the same polarity pole plate of these capacitors is electrically connected to each other, and forms a shnt capacitor; When the quantity of metal tube is odd number, the remaining metal tube that divides into groups is incorporated to any utmost point of shnt capacitor; One utmost point ground connection (shell) of this shnt capacitor, another utmost point is drawn by outgoing cable heart yearn 12.During grouping, preferably outer tube and core pipe are divided in same polarity, and ground connection.
Above-mentioned metal tube is preferably selected high-quality stainless-steel tube, to adapt to corrosive liquid body medium.When selecting the caliber of metal tube, preferably make the distance in gap between each pipe consistent.
On pedestal 1, insulation sleeve 2, have the inlet opening 13 that leads to respectively gap between each pipe.This inlet opening 13 also can be opened the hypomere at metal tube, makes gap between all pipes become linker structure, and communicates with outside liquid medium.
Described upper cover is constituted by upper cover insulation sleeve 7, locking double-screw bolt 8, outer tube upper end locating sleeve 9, in the inner cylinder of outer tube upper end fixed cover 9, there is the internal thread with locking double-screw bolt 8 adaptations, during sensor assembling, screw locking double-screw bolt 8, make each part and the metal tube of upper cover closely fixing, outer tube upper end fixed cover 9 also has the hole that passes of outgoing cable 11, is provided with cable gland 10 in hole.
This sensor has vent port 14, and when in sensor, liquid level rises, the air in upper space is discharged outside sensor thereupon, to avoid air to form resistance, affects liquid level and freely rises and cause measuring error.This vent port 14 can be opened upper and cover, and runs through and covers insulation sleeve 7, locking double-screw bolt 8, and gap between each pipe is communicated with space outerpace.This vent port 14 also can be opened the epimere at metal tube, makes gap between all pipes become linker structure, and communicates with space outerpace.
Referring to Fig. 1, Fig. 3, Fig. 4: be that an inner tube in sensor (this example is selected time outer field large inner tube 6), is splitted structure with the difference of embodiment 1, in a circumferential direction to being divided into two lobes, as shown in Figure 3, or be divided in a circumferential direction 3 lobes, as shown in Figure 4.Insulated from each other between lobe and lobe, each lobe all, as a pole plate of capacitor, is all provided with one and draws electric wire on each pole plate, all termination parallel connections of drawing electric wire, all the other metal tubes are electrically connected to each other, as another pole plate of capacitor, and ground connection (shell), form a shnt capacitor.
All the other are identical with embodiment 1.
The use state of this sensor is referring to Fig. 5: when liquid level generation eustasy, because fluid to be measured is different from the dielectric coefficient of air, the capacity of capacitor also just changes thereupon, like this, by the electric capacity of Detection capacitance device, can learn corresponding liquid level.Because the capacity of this capacitor is large, when liquid level generation eustasy, capacitance change is also large, therefore sensor is highly sensitive, with the measurement mechanism of conventional resolution, can reflect truly, exactly that liquid level changes, and improves liquid level accuracy of detection.
In the above-described embodiments, also can on the inside and outside wall of metal tube, be coated with insulating layer coating, make sensor not only can be used for insulativity liquid medium, also can be used for nonisulated property liquid medium.
Above-described embodiment is for the utility model is described; rather than restriction the utility model; any improvement of doing according to invention thinking of the present utility model; for example on the basis of the present embodiment, increase the quantity of set metal pipe or the distinguish quantity of distinguish metal tube, all in protection domain of the present utility model.
Claims (10)
1. a capacitance level transducer, it is characterized in that, comprise at least 4 metal tube, insulator foot, insulation upper covers that caliber is different, described metal tube is vertically arranged, coaxial package, their lower end is fixedly connected with insulator foot jointly, and upper end is fixedly connected with insulation upper cover jointly, gapped between adjacent metal pipe; All metal tubes are divided into two groups, and as a pair of pole plate of capacitor, metal tube is on the same group electrically connected to each other, and form a shnt capacitor, and this shnt capacitor has the electric wire of drawing; Described insulator foot or metal tube hypomere have with each pipe between the corresponding inlet opening in gap, described insulation upper cover or metal tube epimere have with each pipe between the corresponding vent port in gap.
2. capacitance level transducer as claimed in claim 1, is characterized in that, the grouping scheme of described metal tube is, all metal tubes are alternate is divided into two groups, and as a pair of pole plate of capacitor, metal tube is on the same group electrically connected to each other, and forms a shnt capacitor; A utmost point body contact, another utmost point of this shnt capacitor are drawn by drawing electric wire; Or
All metal tubes are pressed ecto-entad or the every two a pair of pole plates as capacitor of order from inside to outside, form a plurality of capacitors, and the same polarity pole plate of these capacitors is electrically connected to each other, and forms a shnt capacitor; When the quantity of metal tube is odd number, the remaining metal tube that divides into groups is incorporated to any utmost point of shnt capacitor; A utmost point body contact, another utmost point of this shnt capacitor are drawn by drawing electric wire.
3. capacitance level transducer as claimed in claim 1, is characterized in that, described base is constituted by pedestal base insulation sleeve, inner tube lower end locating sleeve, and described inlet opening is opened on pedestal.
4. capacitance level transducer as claimed in claim 1, it is characterized in that, described upper cover consists of core pipe box, inner tube upper end locating sleeve, insulator cap, outer tube upper end fixed cover, locking screw column combination, and described outer tube upper end fixed cover has the internal thread with locking double-screw bolt adaptation.
5. capacitance level transducer as claimed in claim 4, is characterized in that, described vent port is opened upper and covered, and this vent port runs through core pipe box, inner tube upper end locating sleeve, insulator cap, locking double-screw bolt, and gap between each pipe is communicated with space outerpace.
6. capacitance level transducer as claimed in claim 4, is characterized in that, described vent port is opened the epimere at metal tube, makes gap between all pipes become linker structure, and communicates with space outerpace.
7. capacitance level transducer as claimed in claim 1, is characterized in that, the metal tube that is positioned at suit center is metal bar also.
8. capacitance level transducer as claimed in claim 1, is characterized in that, on the inside and outside wall of described metal tube, is coated with insulation course.
9. a capacitance level transducer, comprise at least 4 calibers different metal tube, insulator foot, insulation upper cover, described metal tube is vertically arranged, coaxial package, their lower end is fixedly connected with insulator foot jointly, upper end is fixedly connected with insulation upper cover jointly, gapped between adjacent metal pipe, on described insulator foot, have with each pipe between the corresponding inlet opening in gap, described insulation upper cover or metal tube epimere have with each pipe between the corresponding vent port in gap, it is characterized in that, in described metal tube, having an inner sleeve is splitted structure, insulated from each other between lobe and lobe, each lobe is all as a pole plate of capacitor, on each pole plate, be all provided with one and draw electric wire, all termination parallel connections of drawing electric wire, all the other metal tubes are electrically connected to each other, another pole plate as capacitor, form a shnt capacitor.
10. capacitance level transducer as claimed in claim 9, is characterized in that, the inner sleeve of described distinguish made progress to being divided into 2 lobes or being divided into 3 lobes in week.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320333614.2U CN203422136U (en) | 2013-06-09 | 2013-06-09 | Capacitance type liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320333614.2U CN203422136U (en) | 2013-06-09 | 2013-06-09 | Capacitance type liquid level sensor |
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| CN203422136U true CN203422136U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320333614.2U Expired - Fee Related CN203422136U (en) | 2013-06-09 | 2013-06-09 | Capacitance type liquid level sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105197456A (en) * | 2015-09-17 | 2015-12-30 | 太仓市金锚化工有限公司 | Gaugeable storage tank for low-specific-gravity liquid chemicals |
| CN108007530A (en) * | 2017-11-30 | 2018-05-08 | 四川泛华航空仪表电器有限公司 | A kind of capacitance type liquid level detection method |
-
2013
- 2013-06-09 CN CN201320333614.2U patent/CN203422136U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105197456A (en) * | 2015-09-17 | 2015-12-30 | 太仓市金锚化工有限公司 | Gaugeable storage tank for low-specific-gravity liquid chemicals |
| CN108007530A (en) * | 2017-11-30 | 2018-05-08 | 四川泛华航空仪表电器有限公司 | A kind of capacitance type liquid level detection method |
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| 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: 20140205 Termination date: 20210609 |
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| CF01 | Termination of patent right due to non-payment of annual fee |