CN2282185Y - Wire winded capacitor of humidity and water content sensor - Google Patents
Wire winded capacitor of humidity and water content sensor Download PDFInfo
- Publication number
- CN2282185Y CN2282185Y CN95239074.4U CN95239074U CN2282185Y CN 2282185 Y CN2282185 Y CN 2282185Y CN 95239074 U CN95239074 U CN 95239074U CN 2282185 Y CN2282185 Y CN 2282185Y
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- Prior art keywords
- electric capacity
- wire
- wound electric
- humidity
- wound
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- 239000003990 capacitor Substances 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 8
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229920002521 macromolecule Polymers 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims 2
- 238000001746 injection moulding Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 3
- 210000003298 dental enamel Anatomy 0.000 abstract 1
- 230000001953 sensory effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model discloses a wire wound capacitor used for a humidity and moisture sensor. At least two conducting wires coated with thin insulating layers are wound in parallel, the conducting wires are divided into two groups, and each group is led out with electrodes. When tow conducting wire is used for winding, the two conducting wires form a sensing capacitor; normally, two strands enamel wires are wound. The self and coated hydroscopic material can form various humidity and moisture sensors. The utility model has the characteristics of secular stability and reliable use.
Description
The utility model relates to the making to the sensitive element of humidity and moisture content.
The sensor that prior art is used to detect humidity and moisture content mainly can be divided into hydrone affinity type and non-hydrone affinity type.The dependence hydrone is adsorbed in the humidity-sensitive film of sensor and causes that the sensor that the sensor electrical parameter changes belongs to hydrone affinity type, and the sensor that does not rely on the hydrone adsorption process then is included into non-hydrone affinity type.Current actual humidity and the moisture sensor that uses mainly is hydrone affinity type.
The humidity of hydrone affinity type and moisture sensor can be divided into the conductivity type sensor of the wet back of detecting sensor sense resistance variations and the capacitance type transducers of the wet back of detecting sensor sense capacitance variations again.At present, the shortcoming of conductivity type sensor ubiquity long-time stability, less reliable, when organizing scientific research task to study this class conductivity type sensor degradation mechanism, people are just looking at stability and reliability capacitance type transducers preferably.
Aspect the capacitor type humidity sensor, existing technology has developed the humidity sensor of types such as micropore alundum (Al, mesoporous silica and macromolecule membrane.They are wet sensory material with micropore alundum (Al, mesoporous silica and moisture-absorption resin film respectively, make electrode on the two sides of this class wet sensory material film.
The common trait of existing capacitive humidity sensor is: a plane humidity-sensitive film is arranged, and there is metal electrode on the two sides of film.Because humidity-sensitive film has only tens micron thickness usually, the making of electrode and humidity-sensitive film can only be formed a complete technological for realizing the technological process that this latent structure is formulated.Be that its film manufacturing process of each existing capacitive transducer must be associated with electrode manufacturing process, otherwise or electrode manufacturing process must arrange with film manufacturing process is unified.The common drawback of this latent structure of existing capacitive humidity sensor is: (1) wet sensory material is limited by technology, is difficult to change flexibly as required wet sensory material, and (2) are in case sensor is in the dewfall state, because of conduction between two electrodes produces wrong report.
The utility model purpose provides a kind of wire-wound electric capacity and sensor thereof of making electric capacity humidity and moisture sensor.
Technical solution of the present utility model is, with at least two leads that scribble thin dielectric layer and around, and be divided into two groups, every group of each extraction electrode wherein, with two lead coilings the time, these two leads have just constituted sensing capacitance; During coiling generally with two leads together around multi-turn, flat around than disorderly around reliable and stable, high conformity.
σ=8.85pf/m wherein, n be every lead around the number of turn, L is the length (it is isometric to get two leads) of lead, r and r
0The radius of all insulation courses of the company of being respectively and photoconduction core, as use enameled wire, by China's generally held standard, the r/r of 1 molded lines
0Be about 1.18, the r/r of II molded lines
0Be about 1.29, when n＞＞1, can estimate parallel close around after every meter capacitance be about: 1 type C/L 90pf/m, II molded lines C/L 70pf/m, actual measured value conforms to substantially therewith, proves the correct of this estimation.General coiling 50pf～200pf electric capacity (in the dry air) can satisfy the needs of making humidity sensor.With this formula shift onto easily stranded conductor flat around situation.
Further improvement of the utility model comprises; Every lead headtotail and extraction electrode, during coiling two leads parallel close around, be wound on the insulation framework, the coiling face of skeleton is the post toothed surfaces, so that coil is two-sided ventilative good.
The utility model itself promptly is a kind of wet quick and moisture transducer of uniqueness, can be used for the quality of air water molecule between the direct pick-up electrode, realizes the absolute measurement of humidity.Can utilize coating, spraying, vacuum vapor deposition etc. to coat the various hygroscopic materials that are fit to different needs again, form the novel capacitor humidity and the moisture sensor of various parameters and performance at this capacitance gap.Possess long-term stability, reliable operating characteristic.
The utility model is described in further detail below in conjunction with accompanying drawing with by embodiment:
Fig. 1 has provided the wire-wound capacitive junctions composition that is used for humidity sensor, and it is made of the lead 3 and 5 that skeleton 1,2,4 and two appearances of terminal pin are coated with insulating layer coating.Bobbin 1 is selected heatproof, corrosion resistant insulating polymeric material injection mo(u)lding for use.The stud wheel shape outer rim of bobbin is to have the high ventilation performance for the sensor that guarantees to make.Terminal pin 2 and 4 is the nickel plating wire producing, constitutes two conductive lead wire pin of capacitance electrode.Lead 3 and 5 material are equal to and equal in length fully, parallel close being around on the skeleton 1.The two ends of lead 3 all are welded in terminal pin 2, and the two ends of lead 5 all are welded in terminal pin 4.Lead 3 and 5 appearance are coated with heatproof, corrosion resistant thin layer insulant.Constitute the wire-wound capacitance electrode thus.Fig. 2 is coated with the humidity-electric capacity response curve of the humidity sensor that makes behind the silicon dioxide gel for wire-wound electric capacity of the present utility model.
The high 6mm of insulation bobbin, outer garden diameter 10mm, the edge is processed into the stud wheel shape, uses the polysulfones injection mo(u)lding.Terminal pin 2,4 respectively is the nickel-coated wire of the long 15mm of diameter 0.8mm.Wherein the long part of 5mm is inserted in the polysulfones skeleton in the Shooting Technique process.Lead 3 and 5 is selected enamel-cover garden copper cash for use.This line is that enamelled coating thickening type, insulation course are polyurethane.Get two on the line of nominal diameter 0.07mm, long 950mm, an end of two lines is welded to terminal pin 2 and 4 respectively.Two lines are parallel close around 30 circles along insulation framework, the other end of two remaining lines respectively is welded on the leg of the original welding of each line, promptly finish the making of wire-wound electric capacity.In the manufacturing process and make the back that finishes and keep coiling parallel, tight.After coiling finishes made wire-wound electric capacity is inserted capacitance meter table look-up electric capacity (in the dry air), should be about 70pf.The leakage current of this capacitance electrode is less than 1 * 10 under 20 volts of DC voltage
-9Ampere, leak resistance is greater than 20000M Ω.
Above-mentioned hygroscopic material is coated on the coil of the present utility model, can be made the humidity sensor stable and reliable for performance that adapts to varying environment atmosphere.Multiple conducting wires and around, be divided into two groups, can reach needed electric capacity around the less number of turn.
The application of wire-wound capacitance electrode in humidity and moisture measurement.
(1) is used for the drier monitoring.
Dryer works near 100 ℃ usually.The specific volume of considering water be 1250 and the specific inductive capacity of water be about 76, then the variation of per 100% relative humidity causes being changed to relatively of electric capacity under this temperature
The precision that present electronic circuit technology is measured electric capacity has reached 1/1000, also can further improve precision with special design.If be equipped with temperature sensor, can directly utilize the relative humidity or the absolute humidity of water vapour in the wire-wound capacitance measurement dryer that present technique provides, the precision 2% of relative humidity, the precision of absolute humidity (with the steam partial pressure metering) is 2 * 10
3Pa
(2) be used for moisture measurement under the ambient temperature and moisture
Various suitable wet sensory materials are made the sensor that Relative Humidity Measuring can be provided between the wire-wound capacitance electrode that provides to present technique by coating, spraying, vacuum evaporation deposition or other method.Wet sensory material can be selected metal or nonmetal oxide, salt, macromolecule moisture-absorption resin class, and other has the wet materials with function of sense, with adapt in the practicality about heatproof humidity impact, oxytolerant gasification or reducing atmosphere, corrosion-resistant gas or other requirement.As long as selected wet sensory material stable performance and do not evaporate, run off under environment for use, not with environment gas generation chemical reaction, made humidity sensor is for stable, reliable.
(3) be used for the development research of the moisture measurement sensor of dry gas.
Making bibulous material under the trace water atmosphere between the wire-wound electric capacity that present technique provides, can make and be used for micro-aqueous vapor measured sensor.Owing in the materials process of making, be difficult to avoid the acids material, and the wire-wound electric capacity that present technique provided possesses the acid corrosion-resistant performance, therefore can on the wire-wound capacitance electrode, make the minor amount of water gas sensor to the minor amount of water sensitivity.
Other embodiment of the present utility model comprises: the 1. not selection in collinear footpath.Diameter is generally selected for use between 0.02mm-0.2mm, and the electric capacity that the insulated conductor of same length makes is suitable substantially, and the wire-wound electric capacity volume that little line is directly made is little, but the footpath coiling of big line is easier.2. the selection of different insulative layer material.Can select polyester, polyurethane for use, polyimide etc. also can develop polytetrafluorethylecoatings coatings.The selection of 3. coiling mode.Be the inductance after the coiling of accurate elimination lead, can adopt the winding of elimination inductance commonly used, but other winding do not influence significantly to the humidity sensor performance of making.
Claims (9)
1, a kind of wire-wound electric capacity that is used for humidity and moisture sensor is characterized in that with at least two leads that scribble thin dielectric layer and around forming electric capacity, and is divided into two groups, wherein every group of each extraction electrode.
2,, it is characterized in that the time headtotail of every lead and extraction electrode with two lead coilings by the described wire-wound electric capacity of claim 1.
3, by claim 1,2 described wire-wound electric capacity, it is characterized in that lead is flat on insulation framework, terminal pin is preset in splicing or injection moulding on skeleton.
4, by claim 1,2 described wire-wound electric capacity, it is characterized in that with enameled wire parallel close around.
5, by claim 1,2 described wire-wound electric capacity, the coiling face that it is characterized in that skeleton is for mentioning wheel face.
6, by claim 1,2 described wire-wound electric capacity, it is characterized in that eliminating the inductance method coiling.
7,, it is characterized in that wire-wound electric capacity gets 50～200pf by claim 1,2 described wire-wound electric capacity.
8, by claim 1,2 described wire-wound electric capacity, it is characterized in that can be on wire-wound electric capacity coating metal or nonmetal oxide, salt, macromolecule moisture-absorption resin or other have the wet materials with function of sense.
9, by the described wire-wound electric capacity of claim 8, it is characterized in that coated with silicon dioxide colloidal sol, moisture-absorption resin, halogenide such as lithium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95239074.4U CN2282185Y (en) | 1995-01-20 | 1995-01-20 | Wire winded capacitor of humidity and water content sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95239074.4U CN2282185Y (en) | 1995-01-20 | 1995-01-20 | Wire winded capacitor of humidity and water content sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2282185Y true CN2282185Y (en) | 1998-05-20 |
Family
ID=33880943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95239074.4U Expired - Fee Related CN2282185Y (en) | 1995-01-20 | 1995-01-20 | Wire winded capacitor of humidity and water content sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2282185Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368797C (en) * | 2005-07-29 | 2008-02-13 | 中国科学院南京土壤研究所 | Capacity type soil humidity sensor and its manufacturing method |
-
1995
- 1995-01-20 CN CN95239074.4U patent/CN2282185Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368797C (en) * | 2005-07-29 | 2008-02-13 | 中国科学院南京土壤研究所 | Capacity type soil humidity sensor and its manufacturing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |