CN203443633U - Double-capacitor liquid level sensor - Google Patents
Double-capacitor liquid level sensor Download PDFInfo
- Publication number
- CN203443633U CN203443633U CN201320542422.2U CN201320542422U CN203443633U CN 203443633 U CN203443633 U CN 203443633U CN 201320542422 U CN201320542422 U CN 201320542422U CN 203443633 U CN203443633 U CN 203443633U
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- electric capacity
- inner sleeve
- outer tube
- main measurement
- spacing block
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Abstract
The utility model discloses a double-capacitor liquid level sensor which comprises a main measuring capacitor and a reference measuring capacitor. The height of the reference measuring capacitor is smaller than that of the main measuring capacitor, the main measuring capacitor and the reference measuring capacitor are externally arranged on a mounting seat in parallel, and the main measuring capacitor and the reference measuring capacitor are in insulated isolation. According to the double-capacitor liquid level sensor, the reference measuring capacitor which is lower than the main measuring capacitor is added on the basis of the main measuring capacitor, measuring errors caused by the changes of the dielectric constant of measured media are eliminated by introducing the reference measuring capacitor, and thus the measuring accuracy is improved. Furthermore, due to the facts that the main measuring capacitor and the reference measuring capacitor are arranged on the mounting seat in parallel and the main measuring capacitor and the reference measuring capacitor are in the insulated isolation, when the two capacitors work, measuring capacitance cannot be formed by the electrodes between the main measuring capacitor and the reference measuring capacitor, influences will not be generated mutually, and thus the measuring stability and the measuring accuracy are improved greatly.
Description
Technical field
The utility model relates to a kind of BL, particularly a kind of pair of capacitive liquid level sensor.
Background technology
Capacitance level transducer, for measuring the liquid level of non-conductive medium, be mainly to utilize the DIELECTRIC CONSTANT ε of different insulating mediums different, and the capacitance of two pole plates will change when filling different media between two pole plates of measuring sonde.By the electric capacity between two pole plates of detection probe, realize the measurement of liquid level.Capacitance between two pole plates is:
.Wherein
be the specific inductive capacity of two media between pole plate,
be the useful area of two pole plates,
be two distances between pole plate, from above formula, measure electric capacity and be subject to specific inductive capacity
, two polar plate areas
, the distance between pole plate
impact, in the manufacturing process of capacitive transducer, can be by two polar plate areas
and the distance between pole plate
be designed to constant, but specific inductive capacity
can change along with the variation of the factors such as the temperature of measuring media, density, impact greatly.At present, all adopting on the market single capacitor to carry out level gauging, or adopt two electric capacity of coaxial configuration to measure, all there is impact in various degree in these two kinds of measurement scheme, and measuring accuracy is declined.As single capacitor measuring principle, measure electric capacity and be all subject to specific inductive capacity
impact, along with the temperature of medium, variable density and change, application is restricted.And two capacitance measurement schemes of coaxial configuration, it can solve specific inductive capacity
be subject to the temperature of medium, the problem of Effects of Density, but two electric capacity are arranged in same inner tube, a wherein electrode of an electric capacity and two electrodes of another electric capacity all can form measurement electric capacity, and two electric capacity are when work, mutually exert an influence, Measurement sensibility and measuring accuracy are declined.
Utility model content
In order to solve single capacitor structure, in measuring process, be subject to the problem of two electric capacity two electric capacity phase mutual interference in measuring process of temperature, Effects of Density and the coaxial configuration of medium, the purpose of this utility model is to provide a kind of pair of capacitive liquid level sensor, the DIELECTRIC CONSTANT ε that the two-capacitance sensor of this structure can solve measuring media is subject to the temperature of medium, the problem of Effects of Density, can also allow two electric capacity mutually interference-free, improve the precision of measurement and the stability of measurement.
The technical scheme that the invention for solving the technical problem adopts is:
A kind of pair of capacitive liquid level sensor, comprise main measurement electric capacity and reference measure electric capacity, the height of described reference measure electric capacity is less than main measurement electric capacity, and described main measurement electric capacity and reference measure electric capacity is external being arranged on mount pad side by side, main measurement electric capacity and the isolation of reference measure capacitive insulation.
Further, described main measurement electric capacity comprises the first outer tube and be arranged at the first inner sleeve in the first outer tube, and the two ends up and down of described the first outer tube and the first inner sleeve are separately installed with the first spacing block, by the first outer tube and the isolation of the first inner sleeve.
As above-mentioned further improvement, the first described spacing block is flush-mounted in the first outer tube, on the first spacing block, have the annular groove matching with the first inner sleeve tube wall, the end of the first inner sleeve is plugged in annular groove, on described the first outer tube and/or the first inner sleeve, have liquid pass hole, on described the first spacing block, have the first through hole communicating with the first inner sleeve.
As above-mentioned further improvement, on described the first spacing block, be packaged with for fixing the capping of the first spacing block, in described capping, have the via hole communicating with first spacing block the first through hole, described capping is welded on the first outer tube.
As above-mentioned further improvement, described the first spacing block is extended with the extension stretching in the first inner sleeve along annular groove inwall.
Further, described reference measure electric capacity comprises the second outer tube and be arranged at the second inner sleeve in the second outer tube, and the two ends up and down of described the second outer tube and the second inner sleeve are separately installed with the second spacing block, by the second outer tube and the isolation of the second inner sleeve.
As above-mentioned further improvement, the inner groove that has the outer groove that matches with the second outer tube tube wall on described the second spacing block, matches with the second inner sleeve tube wall, the end of described the second outer tube is plugged in outer groove, the end of the second inner sleeve is plugged in inner groove, on described the second outer tube and/or the second inner sleeve, have liquid pass hole, on described the second spacing block, have the second through hole communicating with the second inner sleeve.
As above-mentioned further improvement, between described main measurement electric capacity and reference measure electric capacity, be provided with lead connecting pieces, in described lead connecting pieces, have the fairlead that is communicated with main measurement electric capacity inner chamber and reference measure electric capacity inner chamber.
Further, described mount pad comprises the seat of honour and lower, on the described seat of honour, be set side by side with mounting hole and the first cavity, on lower seat, be set side by side with respectively and mounting hole and opposed the second cavity of the first cavity and the 3rd cavity, be inserted in the seat of honour by mounting hole the upper end of described main measurement electric capacity, be inserted in first cavity at the seat of honour upper end of reference measure electric capacity, and be inserted in respectively in second cavity and the 3rd cavity of lower the lower end of main measurement electric capacity and reference measure electric capacity.
Further, described main measurement electric capacity is weldingly fixed on the seat of honour and/or lower.
The beneficial effects of the utility model are: a kind of pair of capacitive liquid level sensor that the utility model adopts, on the basis of main measurement electric capacity, increased the little reference measure electric capacity of the main measurement electric capacity of aspect ratio, by introducing reference measure electric capacity, eliminate the measuring error of bringing because of measured medium change in dielectric constant, improve the precision of measuring.And the main measurement electric capacity in the utility model and reference measure electric capacity external being arranged on mount pad arranged side by side, main measurement electric capacity and the isolation of reference measure capacitive insulation, two electric capacity are when work, electrode between main measurement electric capacity and reference measure electric capacity can not form measurement electric capacity, mutually can not exert an influence, the stability of measurement and the precision of measurement are improved greatly.
Accompanying drawing explanation
Fig. 1 is measuring principle figure of the present utility model;
Fig. 2 is the STRUCTURE DECOMPOSITION figure of the utility model the first embodiment;
Fig. 3 is the cross section view of the utility model the second embodiment.
Description of reference numerals: 1 ... main measurement electric capacity, 11 ... the first outer tube, 12 ... the first inner sleeve, 13 ... the first spacing block, 131 ... annular groove, 132 ... the first through hole, 14 ... capping, 141 ... via hole, 2 ... reference measure electric capacity, 21 ... the second outer tube, 22 ... the second inner sleeve, 23 ... the second spacing block, 231 ... outer groove, 232 ... inner groove, 233 ... the second through hole, 133 ... extension, 31 ... the seat of honour, 311 ... mounting hole, 312 ... the first cavity, 32 ... lower seat, 321 ... the second cavity, 322 ... the 3rd cavity, 33 ... position, hole, 4 ... liquid pass hole, 5 ... lead connecting pieces, 51 ... fairlead.
Embodiment
Below in conjunction with accompanying drawing and example, the utility model is described in further detail.
Shown in Fig. 1-Fig. 2, a kind of pair of capacitive liquid level sensor of the present utility model, comprise main measurement electric capacity 1 and reference measure electric capacity 2, the height of described reference measure electric capacity 2 is less than main measurement electric capacity 1, described main measurement electric capacity 1 and reference measure electric capacity 2 external being arranged on mount pad arranged side by side, main measurement electric capacity 1 and the 2 insulation isolation of reference measure electric capacity.
Wherein said main measurement electric capacity 1 comprises the first outer tube 11 and is arranged at the first inner sleeve 12 in the first outer tube 11, reference measure electric capacity 2 comprises the second outer tube 21 and is arranged at the second inner sleeve 22 in the second outer tube 21, the two ends up and down of described the first outer tube 11 and the first inner sleeve 12 are separately installed with the first spacing block 13, thereby by the first outer tube 11 and the first inner sleeve 12 isolation.In like manner, the two ends up and down of described the second outer tube 21 and the second inner sleeve 22 are separately installed with the second spacing block 23, by the second outer tube 21 and the second inner sleeve 22 isolation, allow between the first outer tube 11 and the first inner sleeve 12, the second outer tube 21 and the second inner sleeve 22 form described main measurement electric capacity 1 and reference measure electric capacity 2, described the first spacing block 13 and the second spacing block 23 consist of insulating material.
The main measurement electric capacity 1 of take is example, and the first described outer tube 11 and the first inner sleeve 12 are as two pole plates of electric capacity, due to the relative efficiency area of the first outer tube 11 and the first inner sleeve 12
, the distance between pole plate
are all fixing constants, therefore the capacitance of main measurement electric capacity 1 is with the specific inductive capacity between the first outer tube 11 and the first inner sleeve 12
and change, and specific inductive capacity
therefore liquid level with the first outer tube 11 and the first inner sleeve 12 changes again, can calculate current liquid level by measuring the capacitance of the first outer tube 11, but due to but specific inductive capacity
can change along with the variation of the factors such as the temperature of measuring media, density, greatly, so the utility model has increased the little reference measure electric capacity 2 of the main measurement electric capacity 1 of aspect ratio on the basis of main measurement electric capacity 1 in impact.
As measured medium does not soak reference measure electric capacity 2 completely, can change to calculate gas part change in dielectric constant by detecting the capacitance of reference measure electric capacity 2, and the measured value of product is revised; As reference measure electric capacity 2 is fully immersed in measured medium, can by detect the capacitance of reference measure electric capacity 2 change to calculate measured medium specific inductive capacity variable quantity and the measured value of product is revised.By introducing reference measure electric capacity 2, eliminate the measuring error of bringing because of measured medium change in dielectric constant, improve the precision of measuring.And the main measurement electric capacity 1 in the utility model and reference measure electric capacity 2 external being arranged on mount pad arranged side by side, main measurement electric capacity 1 and the 2 insulation isolation of reference measure electric capacity, two electric capacity are when work, electrode between main measurement electric capacity 1 and reference measure electric capacity 2 can not form measurement electric capacity, mutually can not exert an influence, the stability of measurement and the precision of measurement are improved greatly.
If do not accomplish isolation preferably and fixing between outer tube and inner sleeve, can produce larger error and even can not form measurement electric capacity, in order to make the isolation effect of measurement electric capacity better, more stable, for main measurement electric capacity 1, the first described spacing block 13 is flush-mounted in the first outer tube 11, on the first spacing block 13, have the annular groove 131 matching with the first inner sleeve 12 tube walls, the end of the first inner sleeve 12 is plugged in annular groove 131, because the two ends of the first inner sleeve 12 are all plugged in the annular groove 131 of the first spacing block 13 separately, and the first spacing block 13 is inlaid in the first outer tube 11, therefore the position of the first outer tube 11 and the first inner sleeve 12 is fixed well, isolation effect is good.For reference measure electric capacity 2, the inner groove 232 that has the outer groove 231 that matches with the second outer tube 21 tube walls on described the second spacing block 23, matches with the second inner sleeve 22 tube walls, the end of described the second outer tube 21 is plugged in outer groove 231, the end of the second inner sleeve 22 is plugged in inner groove 232, by the outer groove 231 on the second spacing block 23 and inner groove 232, make the position between the second outer tube 21 and the second inner sleeve 22 relatively fixing, isolation effect is good.
Further, be packaged with for fixing the capping 14 of the first spacing block 13 on described the first spacing block 13, described capping 14 is welded on the first outer tube 11, by welding capping 14, can further fix the position of the first spacing block 13 in the first outer tube 11.In order to strengthen the fixed effect of 13 pairs of the first inner sleeves 12 of the first spacing block, described the first spacing block 13 is extended with the extension 133 stretching in the first inner sleeve 12 along annular groove 131 inwalls simultaneously.
For measuring electric capacity, owing to being by measuring the variation of medium between outer tube and inner sleeve, change calculations by capacitance goes out liquid level, therefore when the utility model is used, liquid should be able to enter into main measurement electric capacity 1, between the outer tube and inner sleeve of reference measure electric capacity 2, because spacing block can better be isolated outer tube and inner sleeve, can enter between outer tube and inner sleeve by barrier liquid simultaneously, therefore for main measurement electric capacity 1, at least on the first outer tube 11 or the first inner sleeve 12, have liquid pass hole 4, allow test solution physical efficiency enter between the first outer tube 11 and the first inner sleeve 12, in like manner, for reference measure electric capacity 2, at least on the second outer tube 21 or the second inner sleeve 22, have liquid pass hole 4.
Further, top and bottom at the first outer tube 11, the first inner sleeve 12, the second outer tube 21, the second inner sleeve 22 have liquid pass hole 4 simultaneously, the effect of exhaust can be played in the hole 4 of spending the night at top, and liquid level sensor can automatically be discharged when leaving liquid, facilitates use next time.
For the speed that further accelerating liquid enters and flows out, the first outer tube 11, the first inner sleeve 12, the second outer tube 21, on the second inner sleeve 22, be provided with liquid pass hole 4, and the accuracy in order to guarantee to measure, described the first outer tube 11, the corresponding setting of liquid pass hole 4 on the first inner sleeve 12, described the second outer tube 21, the corresponding setting of liquid pass hole 4 on the second inner sleeve 22, simultaneously, on the first spacing block 13 and the second spacing block 23, have and the first inner sleeve 12, the first through hole 132 that the second inner sleeve 22 communicates and the second through hole 233, in capping 14 on main measurement electric capacity 1, also have the via hole 141 communicating with the first spacing block 13 first through holes 132.More than design can allow liquid flow to inner sleeve the inside, thereby liquid can by the liquid pass hole 4 on outer tube, inner sleeve, be entered between outer tube and inner sleeve, also can discharge liquid by inner sleeve, can residual liquid, conveniently use next time between the outer tube of main measurement electric capacity 1 and reference measure electric capacity 2 and inner sleeve when taking out liquid level sensor.
Described mount pad comprises the seat of honour 31 and lower 32, on the described seat of honour 31, be set side by side with mounting hole 311 and the first cavity 312, on lower seat 32, be set side by side with respectively and mounting hole 311 and opposed the second cavity 321 of the first cavity 312 and the 3rd cavity 322, during installation, the upper end of main measurement electric capacity 1 is inserted in the mounting hole 311 at the seat of honour 31, adjust the interval of main measurement electric capacity 1 and reference measure electric capacity 2, with reference to the upper end of measuring electric capacity 2, be inserted in first cavity 312 at the seat of honour 31, the lower end of main measurement electric capacity 1 is inserted in second cavity 321 of lower 32, and adjust the position of reference measure electric capacity 2, the lower end of reference measure electric capacity 2 is inserted in the 3rd cavity 322 of lower 32, adopt compression tooling, by the seat of honour 31 and lower 32 compression, simultaneously, in order to allow liquid can flow to the first inner sleeve 12 and the second inner sleeve 22, described the first cavity 312, on the second cavity 321 and the 3rd cavity 322, have the hole position 33 corresponding with inner sleeve.
In order to allow main measurement electric capacity 1 more firmly be connected with mount pad, the mode that adopts welding is welded on the seat of honour 31 and lower 32 on the first outer tube 11 of main measurement electric capacity 1, thereby realizes the firm installation side by side of main measurement electric capacity 1 and reference measure electric capacity 2.
Shown in Fig. 3, for the second embodiment of the present utility model, the places different from above-mentioned the first embodiment are, between described main measurement electric capacity 1 and reference measure electric capacity 2, be provided with lead connecting pieces 5, in described lead connecting pieces 5, have the fairlead 51 that is communicated with main measurement electric capacity 1 first inner sleeve 12 and reference measure electric capacity 2 second inner sleeves 22, in order to obtain the capacitance of main measurement electric capacity 1 and reference measure electric capacity 2, need respectively to the first outer tube 11, the first inner sleeve 12, the second outer tube 21, the second inner sleeve 22 lead-in conductors connect, the utility model can allow wire all from the end of the first inner sleeve 12, enter main measurement electric capacity 1, the first outer tube 11 with main measurement electric capacity 1, the first inner sleeve 12 is electrically connected to, and by fairlead 51, be connected to the second outer tube 21 and second inner sleeve 22 of reference measure electric capacity 2, certainly, described wire also can all enter from the second inner sleeve 22 of reference measure electric capacity 2, and be connected to main measurement electric capacity 1 by fairlead 51, described lead connecting pieces 5 is working of plastics, this design can conveniently arrange wire, not only convenient when connecting, outward appearance is better, and its stability also increases greatly, compare with the mode directly going between by perforate on pipe box, be provided with lead connecting pieces 5 and can prevent that lead-in wire from being damaged by the sharp edges of metal pipe box, better reliability.
The above, be preferred embodiment of the present utility model, and the utility model is not limited to above-mentioned embodiment, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection domain of the present utility model.
Claims (9)
1. a two capacitive liquid level sensor, comprise main measurement electric capacity and reference measure electric capacity, the height of described reference measure electric capacity is less than main measurement electric capacity, it is characterized in that: described main measurement electric capacity and reference measure electric capacity is external being arranged on mount pad side by side main measurement electric capacity and the isolation of reference measure capacitive insulation.
2. a kind of pair of capacitive liquid level sensor according to claim 1, it is characterized in that: described main measurement electric capacity comprises the first outer tube and is arranged at the first inner sleeve in the first outer tube, the two ends up and down of described the first outer tube and the first inner sleeve are separately installed with the first spacing block, by the first outer tube and the isolation of the first inner sleeve.
3. a kind of pair of capacitive liquid level sensor according to claim 2, it is characterized in that: the first described spacing block is flush-mounted in the first outer tube, on the first spacing block, have the annular groove matching with the first inner sleeve tube wall, the end of the first inner sleeve is plugged in annular groove, on described the first outer tube and/or the first inner sleeve, have liquid pass hole, on described the first spacing block, have the first through hole communicating with the first inner sleeve.
4. a kind of pair of capacitive liquid level sensor according to claim 3, it is characterized in that: on described the first spacing block, be packaged with for fixing the capping of the first spacing block, in described capping, have the via hole communicating with first spacing block the first through hole, described capping is welded on the first outer tube.
5. a kind of pair of capacitive liquid level sensor according to claim 1, it is characterized in that: described reference measure electric capacity comprises the second outer tube and is arranged at the second inner sleeve in the second outer tube, the two ends up and down of described the second outer tube and the second inner sleeve are separately installed with the second spacing block, by the second outer tube and the isolation of the second inner sleeve.
6. a kind of pair of capacitive liquid level sensor according to claim 5, it is characterized in that: the inner groove that has the outer groove that matches with the second outer tube tube wall on described the second spacing block, matches with the second inner sleeve tube wall, the end of described the second outer tube is plugged in outer groove, the end of the second inner sleeve is plugged in inner groove, on described the second outer tube and/or the second inner sleeve, have liquid pass hole, on described the second spacing block, have the second through hole communicating with the second inner sleeve.
7. a kind of pair of capacitive liquid level sensor according to claim 1, it is characterized in that: between described main measurement electric capacity and reference measure electric capacity, be provided with lead connecting pieces, in described lead connecting pieces, have the fairlead that is communicated with main measurement electric capacity inner chamber and reference measure electric capacity inner chamber.
8. a kind of pair of capacitive liquid level sensor according to claim 1, it is characterized in that: described mount pad comprises the seat of honour and lower, on the described seat of honour, be set side by side with mounting hole and the first cavity, on lower seat, be set side by side with respectively and mounting hole and opposed the second cavity of the first cavity and the 3rd cavity, be inserted in the seat of honour by mounting hole the upper end of described main measurement electric capacity, be inserted in first cavity at the seat of honour upper end of reference measure electric capacity, and be inserted in respectively in second cavity and the 3rd cavity of lower the lower end of main measurement electric capacity and reference measure electric capacity.
9. a kind of pair of capacitive liquid level sensor according to claim 8, is characterized in that: described main measurement electric capacity is weldingly fixed on the seat of honour and/or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320542422.2U CN203443633U (en) | 2013-09-02 | 2013-09-02 | Double-capacitor liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320542422.2U CN203443633U (en) | 2013-09-02 | 2013-09-02 | Double-capacitor liquid level sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203443633U true CN203443633U (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320542422.2U Expired - Lifetime CN203443633U (en) | 2013-09-02 | 2013-09-02 | Double-capacitor liquid level sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112074710A (en) * | 2018-02-08 | 2020-12-11 | 阿札姆家用电器公司 | Device for sensing liquid level, apparatus using the device and calibration method |
| CN113252136A (en) * | 2021-05-12 | 2021-08-13 | 北京布莱迪测控仪表有限公司 | Liquid level sensor |
| CN113670408A (en) * | 2021-09-14 | 2021-11-19 | 珠海格力电器股份有限公司 | Dish washing machine liquid level detection method and device and dish washing machine |
-
2013
- 2013-09-02 CN CN201320542422.2U patent/CN203443633U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112074710A (en) * | 2018-02-08 | 2020-12-11 | 阿札姆家用电器公司 | Device for sensing liquid level, apparatus using the device and calibration method |
| CN112074710B (en) * | 2018-02-08 | 2023-10-13 | 阿札姆家用电器公司 | Device for sensing a liquid level, apparatus using said device and calibration method |
| 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 |
| CN113252136A (en) * | 2021-05-12 | 2021-08-13 | 北京布莱迪测控仪表有限公司 | Liquid level sensor |
| CN113670408A (en) * | 2021-09-14 | 2021-11-19 | 珠海格力电器股份有限公司 | Dish washing machine liquid level detection method and device and dish washing machine |
| CN113670408B (en) * | 2021-09-14 | 2022-07-08 | 珠海格力电器股份有限公司 | Dish washing machine liquid level detection method and device and dish washing machine |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20200528 Address after: Will the West Road hi tech Industrial Village, Xinhui District 529100 Guangdong city of Jiangmen Province Patentee after: JIANGMEN RUNYU SENSOR TECHNOLOGY Co.,Ltd. Address before: Will the West Road hi tech village Xinhui District 529100 Guangdong city of Jiangmen Province Patentee before: XINHUI KANGYU CONTROL SYSTEMS ENGINEERING Inc. |
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Granted publication date: 20140219 |
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| CX01 | Expiry of patent term |