CN106123861A - obliquity sensor - Google Patents
obliquity sensor Download PDFInfo
- Publication number
- CN106123861A CN106123861A CN201610704252.1A CN201610704252A CN106123861A CN 106123861 A CN106123861 A CN 106123861A CN 201610704252 A CN201610704252 A CN 201610704252A CN 106123861 A CN106123861 A CN 106123861A
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- Prior art keywords
- electrode
- housing
- coating
- obliquity sensor
- hole
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
- G01C2009/182—Measuring inclination, e.g. by clinometers, by levels by using liquids conductive
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The present invention provides a kind of obliquity sensor, belong to sensor technical field, described obliquity sensor includes electrode and has the housing of cavity body structure, electrolyte it is injected with in cavity, being provided through the electrode hole of housing on housing, described electrode is inserted in described electrode hole, and one end of electrode is deep in cavity, the other end of electrode is positioned at outside housing, and the material of described housing is ceramic material.The housing that the present invention makes by using ceramic material, the intensity of housing of ceramic material own is higher, and can use injection-compression molding so that the design of obliquity sensor is more convenient with processing.It addition, the housing of ceramic material, its surface property and machinability are significantly better than the housing of glass material, thus can produce that performance is more superior, reliability is higher and structure can obliquity sensor that more multiformity, application are more wide in range.
Description
Technical field
The invention belongs to sensor field, particularly relate to a kind of obliquity sensor.
Background technology
Obliquity sensor is a kind of measurement device for measuring angle of inclination, generally includes a housing, in housing
Portion has a cavity, injects certain electrolyte in cavity simultaneously;It is inserted into several electrodes to liquid after then passing through housing, when
During liquid run-off the straight in housing, the signal of telecommunication on each electrode will change, and then, by recording the change of the signal of telecommunication
Change, i.e. would know that angle of inclination now.
But, existing obliquity sensor, its housing parts generally uses glass material, is primarily due to shell
Body needs to carry out sealing operation in the course of processing, and the housing therefore using glass to make just is convenient for sealing operation.But,
Owing to housing uses glass material to make, thus there are the following problems:
A, glass material housing processability poor;
B, surface of shell poor performance, and then affect the precision of sensor;
C, housing bad mechanical strength, frangible, affect its reliability.
Summary of the invention
Present invention solves the technical problem that and be: be existing during because the housing of obliquity sensor employing glass material is made
The problems referred to above;And provide a kind of and use the obliquity sensor of ceramic material housing to solve the problems referred to above.
The technical solution adopted for the present invention to solve the technical problems is: obliquity sensor, including electrode and have cavity
The housing of structure, is injected with electrolyte in cavity, is provided through the electrode hole of housing on housing, and described electrode is inserted into
In described electrode hole, and one end of electrode is deep in cavity, and the other end of electrode is positioned at outside housing, the material of described housing
For ceramic material.
Further: also include the glass tubing of sealing, and on housing, be additionally provided with the sealing hole running through housing,
Described glass tubing is inserted in described sealing hole, and the outside wall surface of glass tubing seals with sealing hole and coordinates.
Further: described housing includes cell body portion and cover body part, and described cover body part and cell body portion cooperate
Rear formation cavity;Described electrode hole is arranged in described cover body part and/or cell body portion;Described sealing hole is arranged on described cover body part
And/or in cell body portion.
Further: also include that electrode sleeve, described electrode sleeve are enclosed within electrode, and pass through between electrode sleeve and electrode
Bonding agent solidification connects, and described electrode sleeve is inserted in described electrode hole, and passes through bonding agent between electrode sleeve and electrode hole
Solidification connects.
Further: described bonding agent is ceramet glue.
Further: described electrode hole is stepped hole structure, it includes Duan Heyi small-bore, a large aperture section;Described electricity
Pole set is inserted in the section of described large aperture, and one end of described electrode sleeve is resisted against the platform between large aperture section and small-bore section
On terrace.
Further: described electrode includes battery core and the first coating arranged in the periphery of battery core, described first coating
The oxide that material is a kind of metal or this kind of metal;Wherein said metal is gold or silver or platinum or rhodium or palladium
Or caesium.
Further: between battery core and the first coating, be additionally provided with the second coating, the material of described second coating is
Nickel or cobalt or nickel cobalt (alloy).
Further: between the first coating and the second coating, be additionally provided with the 3rd coating, the material of described 3rd coating
Material is gold or platinum.
Further: described first coating is formed by plating, chemical plating, evaporation or ion sputtering mode;When setting
When being equipped with the second coating, described second coating is formed by plating, chemical plating, evaporation or ion sputtering mode;When being provided with
During three coatings, described 3rd coating is formed by plating, chemical plating, evaporation or ion sputtering mode.
The invention has the beneficial effects as follows: by the housing using ceramic material to make, because of this stiffness of the body of housing of ceramic material
Spend higher, and injection-compression molding can be used so that the design of obliquity sensor is more convenient with processing.It addition, ceramic material
Housing, its surface property and machinability be significantly better than the housing of glass material, thus can produce performance more superior,
Reliability is higher and structure can obliquity sensor that more multiformity, application are more wide in range.
It addition, the present invention is also by arranging electrode sleeve, carry out electrode and electrode sleeve are glued by bonding agent simultaneously
Connecing solidification to connect, to replace the mounting means being directly sintered in shell structure by electrode under traditional approach, its advantage is to make
Electrode easier for installation, electrode sleeve may also function as certain buffering over-effect simultaneously, when can avoid the thermal expansion of electrode
Directly effect to housing.It is additionally, since and need not use the mounting means being directly sintered in shell structure by electrode, therefore keep away
Exempt from electrode is caused oxidation, and then corresponding deoxidation operation can have been reduced;And owing to installation need not be sintered, therefore electricity
Pole can be installed after first carrying out face coat processing again, and housing carries out electrode peace after also can first carrying out surface reason processing again
Dress.It addition, electrode is also by being provided with the coating material of certain material on the periphery of core material, electrode so can be strengthened
Oxidation resistance so that it is be difficult to after a long time use by corrosion or passivation;And by using the modes such as plating, chemical plating
The coating formed, can make electrode surface roughness be substantially reduced, and then electrode can be made to be affected more by electrolyte surface tension force
Little, and make electrode show the characteristic of " hydrophobicity ", so, when sensor run-off the straight, the electrolyte on electrode will be quickly
Depart from, thus electrolyte is difficult to be attached on electrode, and then the sensitivity of electrode can be improved.It addition, by arranging coating, also may be used
Reduce the Q-value of electrode;The impedance of electrode is changed also by the thickness controlling respective coatings.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of specific embodiment of obliquity sensor of the present invention;
Fig. 2, Fig. 3 are the enlarged diagram of two kinds of different structures in Fig. 1 at regional area A;
Fig. 4 is the structural representation of electrode hole in Fig. 3;
Fig. 5 is the Longitudinal cross section schematic of electrode;
Fig. 6 is the cross sectional representation of electrode;
Fig. 7 and Fig. 8 is two kinds of electrode holes or seals the schematic diagram that hole is arranged on the embodiment of diverse location;
Figure is labeled as: electrode 1, battery core the 11, first coating the 12, second coating the 13, the 3rd coating 14, cavity 2, housing 3,
Cell body portion 31, cover body part 32, sealing hole 33, electrode hole 4, electrode sleeve 5, bonding agent 6, large aperture section 7, small-bore section 8, electrolyte
9, glass tubing 10.
Detailed description of the invention
The present invention is further described with detailed description of the invention below in conjunction with the accompanying drawings.
As shown in Fig. 1 to Fig. 8, obliquity sensor of the present invention, including electrode 1 and the shell with cavity 2 structure
Body 3, is injected with electrolyte 9 in cavity 2, is provided through the electrode hole 4 of housing 3 on housing 3, and described electrode 1 is inserted into
In described electrode hole 4, and one end of electrode 1 is deep in cavity 2, and the other end of electrode is positioned at outside housing 3, described housing 3
Material be ceramic material.
In the present invention, by using the housing 3 of ceramic material to replace the glass material of routine, therefore solve employing glass
Problem existing during the housing of material.Further, since after employing ceramic material, its housing the later stage sealing operation the most not
Just, to this end, the present invention is additionally provided with the glass tubing 10 of sealing on the basis of the above, and it is additionally provided with on housing 3 and runs through
The sealing hole 33 of housing 3, described glass tubing 10 is inserted in described sealing hole 33, and the outside wall surface of glass tubing 10 with sealing hole
33 seal cooperation.So, when housing 3 is carried out sealing operation, available glass tubing 10 carries out sealing operation, so makes envelope
Mouthful operation can use the process that the sealing mode of housing with glass material is identical completely, therefore solves the ceramic material of employing
The problem that the housing 3 of material is inconvenient to seal.More specifically, the present invention arranges position for sealing hole 33, does not limit,
In theory, can be arranged at any position on housing 3.Such as, in accompanying drawing 7 and accompanying drawing 8, correspond respectively to seal hole 33
It is arranged in cover body part 32 and cell body portion 31.It addition, the sealing for glass tubing 10 with sealing hole 33 coordinates, can be by corresponding
Bonding agent carries out bonding cooperation, such as, can carry out bonding cooperation by ceramet glue.
Certainly, owing to the housing 3 in the present invention uses ceramic material to make, therefore, it is for glass material, can
Processability is higher, as injection-compression molding mode can be used to produce;And more specifically, housing 3 also can be by cell body portion 31 and lid
Body 32 two parts form, and as shown in fig. 1, cover body part 32 are covered in cell body portion 31, and by cover body part 32 and cell body portion
31 cooperate after form cavity 2, of course for the sealing ensured between cover body part 32 and cell body portion 31, can connecing at the two
Tactile position arranges corresponding bonding agent, carries out bonding as arranged ceramet glue.It addition, be provided with cover body part 32 and cell body portion
When 31, electrode hole 4 may be provided in described cover body part 32 and/or cell body portion 31;Sealing hole 33 may also be arranged on described cover body part
32 and/or cell body portion 31 on;Shown in concrete such as accompanying drawing 7 and accompanying drawing 8.
Certainly, the obliquity sensor described in the invention described above, can be same by being inserted into the electrode 1 of varying number at cavity 2
Time by electrode according to the distribution of ad-hoc location, the sensor of various required precision can be obtained, and also can obtain various single shaft
Obliquity sensor or double-shaft tilt angle sensor.
Furthermore, it is contemplated that the mounting means that electrode 1 of the prior art generally uses is at high temperature directly to burn with housing 3
Knot is together.There are the following problems for the mounting means of this electrode: A, electrode 1 surface are oxidized easily, and cause the painting in the later stage
Layer adds and carries out deoxidation operation man-hour with housing 3 together and bother very much;It is non-that B, housing with electrode carry out secondary fine processing
The most inconvenient;It is very inconvenient that C, electrode with housing carry out face coat processing, can increase the highest cost;D, with
The housing of electrode also cannot do surface processing;E, due to electrode different from the material of housing, and cause its thermal coefficient of expansion
Difference, the bigger stress effect of generation direct to housing after electrode thermal expansion easily occurs.
Therefore, above-mentioned due to the direct problem brought with housing 3 sintering installation of electrode 1 in order to solve, the present invention enters one
Step is provided with electrode sleeve 5, and described electrode sleeve 5 is enclosed within electrode 1, and is solidified by bonding agent 6 between electrode sleeve 5 and electrode 1
Connecting, described electrode sleeve 5 is inserted in described electrode hole 4, and between electrode sleeve 5 and electrode hole 4 by bonding agent 6 solidification even
Connect.Wherein the concrete installation process of electrode 1 is as follows: the first correct position on electrode 1 coats corresponding bonding agent 6, then
Electrode sleeve 5 is inserted on electrode 1 and by bonding agent 6, electrode sleeve 5 is adhered on electrode 1;The most again on the surface of electrode sleeve 5
Coat bonding agent 6, then electrode sleeve 5 is inserted in electrode hole 4 together with electrode 1, treat that corresponding bonding agent 6 solidifies bonding
After, the installation process of the completeest paired electrode 1.
Solidification connected mode above by bonding agent 6 carries out the installation of electrode 1, can avoid using and directly be burnt by electrode 1
Tie the mounting means on housing 3, and then the Oxidation owing to making paired electrode in sintering process can be avoided, the most also can carry
The installation effectiveness of high electrode 1;And owing to operation need not be sintered, after therefore electrode 1 can first carry out face coat processing again
Installing, housing carries out electrode installation after also can first carrying out surface reason or secondary fine processing again.
It addition, the above-mentioned bonding agent 6 that electrode 1 is installed and used, be for by electrode sleeve 5 respectively with electrode 1 and and shell
Body carries out bonding material;As long as the bonding agent 6 of above-mentioned adhesive effect can be met in theory.Due to shell of the present invention
Body 3 uses ceramic material, and therefore bonding agent 6 is preferably ceramet glue;So-called ceramet glue refers to be specifically designed to pottery
And a bonding class bonding agent between metal;So can improve the adhesive effect of bonding agent 6, it is ensured that to firmly installing of electrode 1.
It addition, in order to when electrode sleeve 5 is inserted into electrode hole 4, the installation site of electrode sleeve 5 be played spacing effect,
And then guarantee that the installation site of electrode sleeve 5 is more accurate, described electrode hole 4 can be set to stepped hole structure further.Such as Fig. 3
Shown in Fig. 4, electrode hole 4 includes large aperture section 7 and a small-bore section 8;Described electrode sleeve 5 is inserted into described large aperture section
In 7, and one end of described electrode sleeve 5 is resisted against on the step surface between large aperture section 7 and small-bore section 8.So, installing
Time, it is only necessary to ensure that one end of electrode sleeve 5 abuts to i.e. can ensure that on step surface that electrode sleeve 5 is installed and puts in place, so can enter one
Step improves installation effectiveness.
More specifically, above-mentioned be provided with shoulder hole structure time, large aperture section 7 can use the following two kinds set-up mode:
One, described large aperture section 7 is the one end on electrode hole 4 near cavity 2;The second, described large aperture section 7 is on electrode hole 4
One end away from cavity 2.Wherein, the above-mentioned second way is the situation shown in accompanying drawing 3 and Fig. 4.
It addition, as shwon in Figures 5 and 6, described electrode 1 includes battery core 11 and the first painting arranged in the periphery of battery core 11
Layer 12, the oxide that material is a kind of metal or this kind of metal of described first coating 12;Wherein said metal be gold or
Silver or platinum or rhodium or palladium or caesium.
Owing to the electrode 1 described in the invention described above is used exclusively for the electrode 1 of obliquity sensor, because of in obliquity sensor
Electrode is required higher with the contact relation of electrolyte 9, and in order to improve the sensitivity of electrode 1, it is desirable to occur at sensor
During inclination, corresponding signal intensity can be quickly detected;And in order to realize the quick detection of signal, then need electrode 1 surface
Can quickly change with the generation tilted with the contact relation of electrolyte 9.
The electrode 1 being traditionally used for obliquity sensor is all not provided with coating structure, normally only by corresponding alloy material
The most directly using after making battery core 11, therefore the surface of electrode 1 occurs passivation or the feelings of corrosion the most after a long time use
Condition, and the fineness of electrode surface is poor, thus easily adhere to electrolyte, the sensitivity ultimately resulting in traditional electrode 1 is relatively low.
The present invention by arranging the first coating 12 being made up of certain material on the basis of battery core 11, can strengthen further
The resistant to rust of electrode 1 and resist passivation ability, and further by using the sides such as plating, chemical plating, evaporation or ion sputtering
Formula coats the first coating 12, can further improve the surface smoothness of electrode 1, and then electrode 1 can be made by electrolyte surface tension force
Impact less, the sensitivity of electrode 1 can be improved.It addition, also by the Q-value arranging coating reduction electrode;Also can lead to simultaneously
Cross and control the thickness of respective coatings to change the impedance of electrode 1.
It addition, the most also the second coating 13 can be additionally provided with between battery core 11 and the first coating 12, described
The material of the second coating 13 is nickel or cobalt or nickel cobalt (alloy).The above-mentioned purpose arranging the second coating 13 mainly has two, the
One is the defect that can repair battery core 11 surface, to improve effect during coating the first coating 12;Second can be prevented from being coated with
When covering the first coating 12, battery core 11 is caused erosion.
More specifically, above-mentioned be provided with the first coating 12 and the second coating 13 time, when first coating 12 select be not
When gold or alloy platinum material, in order to improve the first coating 12 and combination effect of the second coating 13 further, can be in the first coating 12
With second arrange the 3rd coating 14 between coating 13, the material of described 3rd coating 14 is gold or platinum.Certainly, when above-mentioned first
When the material of coating 12 inherently selects gold or platinum, then can be without arranging the 3rd coating 14.
It addition, generally battery core 11 can select corresponding alloy material according to the difference of the material of sensor housing 3
Material, such as, when housing 3 is ceramic material, be preferably the alloy material of 4J32 with material trademark;And when housing 3 is high borosilicate
During glass, it is preferably the alloy material of 4J29 with material trademark.
Certainly, the coating method of above-mentioned first coating the 12, second coating 13 and the 3rd coating 14 all can use plating, change
The modes such as plating, evaporation or ion sputtering of learning realize, and after the coating coated by the way, any surface finish of its coating
Spend higher, and coat relatively uniform, it can be ensured that the sensitivity of electrode is higher.
Claims (10)
1. obliquity sensor, including electrode (1) and the housing (3) with cavity (2) structure, is injected with electrolysis in cavity (2)
Liquid (9), is provided through the electrode hole (4) of housing (3) on housing (3), and described electrode (1) is inserted into described electrode hole (4)
In, and in one end of electrode (1) is deep into cavity (2), the other end of electrode is positioned at housing (3) outward, it is characterised in that: described
The material of housing (3) is ceramic material.
2. obliquity sensor as claimed in claim 1, it is characterised in that: also include the glass tubing (10) of sealing, and
Being additionally provided with the sealing hole (33) running through housing (3) on housing (3), described glass tubing (10) is inserted into described sealing hole (33)
In, and the outside wall surface of glass tubing (10) with sealing hole (33) sealing coordinate.
3. obliquity sensor as claimed in claim 2, it is characterised in that: described housing (3) includes cell body portion (31) and lid
Portion (32), and described cover body part (32) and cell body portion (31) cooperate after formed cavity (2);Described electrode hole (4) is arranged
In described cover body part (32) and/or cell body portion (31);Described sealing hole (33) is arranged on described cover body part (32) and/or cell body
In portion (31).
4. obliquity sensor as claimed any one in claims 1 to 3, it is characterised in that: also include electrode sleeve (5), described
Electrode sleeve (5) is enclosed within electrode (1), and is connected by bonding agent (6) solidification between electrode sleeve (5) and electrode (1), described electricity
Pole set (5) is inserted in described electrode hole (4), and between electrode sleeve (5) and electrode hole (4) by bonding agent (6) solidification even
Connect.
5. obliquity sensor as claimed in claim 4, it is characterised in that: described bonding agent (6) is ceramet glue.
6. obliquity sensor as claimed in claim 4, it is characterised in that: described electrode hole (4) is stepped hole structure, and it includes
One large aperture section (7) and a small-bore section (8);Described electrode sleeve (5) is inserted in described large aperture section (7), and described electricity
One end of pole set (5) is resisted against on the step surface between large aperture section (7) and small-bore section (8).
7. obliquity sensor as claimed in claim 1, it is characterised in that: described electrode (1) includes battery core (11) and in battery core
(11) the first coating (12) that periphery is arranged, the oxygen that material is a kind of metal or this kind of metal of described first coating (12)
Compound;Wherein said metal is gold or silver or platinum or rhodium or palladium or caesium.
8. obliquity sensor as claimed in claim 7, it is characterised in that: also set between battery core (11) and the first coating (12)
Being equipped with the second coating (13), the material of described second coating (13) is nickel or cobalt or nickel cobalt (alloy).
9. obliquity sensor as claimed in claim 8, it is characterised in that: between the first coating (12) and the second coating (13)
Being additionally provided with the 3rd coating (14), the material of described 3rd coating (14) is gold or platinum.
10. the obliquity sensor as according to any one of claim 7 to 9, it is characterised in that: described first coating (12) is passed through
Plating, chemical plating, evaporation or ion sputtering mode are formed;When being provided with the second coating (13), described second coating (13)
Formed by plating, chemical plating, evaporation or ion sputtering mode;When being provided with the 3rd coating (14), described 3rd coating
(14) formed by plating, chemical plating, evaporation or ion sputtering mode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201610704252.1A CN106123861A (en) | 2016-08-23 | 2016-08-23 | obliquity sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201610704252.1A CN106123861A (en) | 2016-08-23 | 2016-08-23 | obliquity sensor |
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Publication Number | Publication Date |
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CN106123861A true CN106123861A (en) | 2016-11-16 |
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Family Applications (1)
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CN201610704252.1A Pending CN106123861A (en) | 2016-08-23 | 2016-08-23 | obliquity sensor |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108709539A (en) * | 2018-08-02 | 2018-10-26 | 苏州合衡动电子科技有限公司 | metal shell electrolyte level sensor |
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US6249984B1 (en) * | 2000-04-06 | 2001-06-26 | The Fredericks Company | Electrolytic tilt sensor having a metallic envelope |
US6449857B1 (en) * | 1999-12-07 | 2002-09-17 | Valery A. Anikolenko | Inclinometer and inclinometer network |
CN1668892A (en) * | 2002-06-20 | 2005-09-14 | 株式会社生方制作所 | Electrostatic capacity type liquid sensor |
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EP2141450A1 (en) * | 2008-07-05 | 2010-01-06 | Kabushiki Kaisha TOPCON | Surveying device and automatic tracking method |
CN202304820U (en) * | 2011-10-15 | 2012-07-04 | 赵志强 | Buoy type horizontal inclination angle measuring device |
JP2012149921A (en) * | 2011-01-17 | 2012-08-09 | Topcon Corp | Inclination detector and inclination detecting apparatus |
CN205957965U (en) * | 2016-08-23 | 2017-02-15 | 苏州理欧电子科技有限公司 | Tilt angle sensor |
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2016
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Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1167909A (en) * | 1996-03-15 | 1997-12-17 | 日商机器株式会社 | Uniaxial horizontal sensor |
US6449857B1 (en) * | 1999-12-07 | 2002-09-17 | Valery A. Anikolenko | Inclinometer and inclinometer network |
US6249984B1 (en) * | 2000-04-06 | 2001-06-26 | The Fredericks Company | Electrolytic tilt sensor having a metallic envelope |
CN1668892A (en) * | 2002-06-20 | 2005-09-14 | 株式会社生方制作所 | Electrostatic capacity type liquid sensor |
EP2141450A1 (en) * | 2008-07-05 | 2010-01-06 | Kabushiki Kaisha TOPCON | Surveying device and automatic tracking method |
CN201322616Y (en) * | 2008-12-26 | 2009-10-07 | 刘恩乐 | Measuring instrument |
JP2012149921A (en) * | 2011-01-17 | 2012-08-09 | Topcon Corp | Inclination detector and inclination detecting apparatus |
CN202304820U (en) * | 2011-10-15 | 2012-07-04 | 赵志强 | Buoy type horizontal inclination angle measuring device |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN108709539A (en) * | 2018-08-02 | 2018-10-26 | 苏州合衡动电子科技有限公司 | metal shell electrolyte level sensor |
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