WO2013061916A1 - 静電容量式液面センサー - Google Patents
静電容量式液面センサー Download PDFInfo
- Publication number
- WO2013061916A1 WO2013061916A1 PCT/JP2012/077219 JP2012077219W WO2013061916A1 WO 2013061916 A1 WO2013061916 A1 WO 2013061916A1 JP 2012077219 W JP2012077219 W JP 2012077219W WO 2013061916 A1 WO2013061916 A1 WO 2013061916A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid level
- connection terminal
- electrode
- detection unit
- level sensor
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
- H01R4/023—Soldered or welded connections between cables or wires and terminals
Definitions
- the present invention relates to a capacitance type liquid level sensor for detecting the amount of liquid, and proposes a configuration suitable for one having an airtight terminal for mounting on an electric compressor or the like.
- a capacitive sensor has been proposed as means for detecting the amount of non-conductive liquid such as oil.
- This sensor detects the presence or amount of liquid by utilizing the fact that the capacitance between the electrodes changes when an electrically insulating liquid enters between the electrodes across the space.
- an electrode is arranged in a cylindrical electrically insulating casing, or one electrode is configured in a cylindrical shape, and the capacitance of the liquid in the container changes from the capacitance between the electrodes, which changes as liquid enters and exits into the cylindrical portion.
- Some capacitance-type liquid level sensors are designed to detect continuous fluctuations in the amount of liquid in real time as shown in the above prior art documents. Judgment to detect subtle changes in capacitance becomes difficult, and the capacitance changes depending on the type of liquid and the type and size of the container to which the sensor is attached. is there.
- liquid level sensors having a simplified configuration by limiting the use only to the detection of the presence or absence of a liquid rather than a continuous amount of liquid have been proposed.
- metal electrode plates 105 are fixed to each other at the tips of two conductive pins 104 fixed to the substrate 102 by welding, and are arranged so as to face each other substantially in parallel.
- this liquid level sensor has a simple structure, the distance between the electrodes changes due to a slight inclination caused by welding between the electrode and the conductive pin. Therefore, in order to make the sensitivity uniform, the inclination generated during welding is removed. In addition, it is essential to adjust the distance between the electrodes. In particular, as the electrodes are lengthened so as to increase the area in order to obtain capacitance, the slight inclination of the welded part greatly affects the distance between the electrodes. Furthermore, since the cantilevered electrode is exposed, there is a possibility that the electrode may be deformed when a force is applied during assembly. Further, when the strength is increased by increasing the thickness of the electrode in order to prevent deformation, the stress is concentrated on a relatively weak weld or the like, so that the positional relationship of the electrode may be changed. Therefore, careful handling is required.
- the two electrodes are welded in the same straight line connecting the conductive pins, it is necessary to insert one welding electrode between the conductive pins. Furthermore, when welding the second electrode, the previously fixed electrode also interferes with the welding operation. Further, as the sensor is miniaturized, the distance between the electrodes becomes narrower, so that the electrodes become thinner and thinner, and there is a problem that the pressure between the electrodes applied during welding cannot be obtained sufficiently.
- the distance between the electrodes is made constant by configuring the liquid level detection unit mounted on the hermetic terminal as a detection unit unit with two electrodes and a spacer in advance. It is easy to maintain, and at least one connection terminal for connecting and fixing the detection unit to the conductive pin can be deformed with a weaker force than the electrode causes deformation, so that it is applied to the electrode of the detection unit. Disperses and relaxes stress. Furthermore, since the detection unit is connected and fixed to the hermetic terminal for the electric compressor, it can be easily handled and attached to the hermetic electric compressor.
- connection terminal is made of a metal plate thinner than the electrode, or the length of the connection terminal is made longer than the actual distance between the fixed portions by largely bypassing the bent portion, thereby causing the electrode to be deformed. Can be deformed with a weak force, and the stress applied to the detection unit can be widely dispersed throughout the connection terminals.
- connection terminals by increasing the rigidity of one of the two connection terminals and making the other connection terminal a flexible structure, it is possible to more easily both firmly fix the sealed glass terminal and disperse the stress. it can.
- the liquid level sensor of the present invention by configuring a detection unit unit in which the positional relationship between the electrodes is fixed in advance as the liquid level detection unit, the adjustment work of the positional relationship between the electrodes becomes easy. Furthermore, the connection terminal for fixing the detection unit is made of a sufficiently elastic structure that can be deformed with a weaker force than the electrode causes deformation, so that stress caused by component assembly errors when fixing the detection unit. In addition, most of the force generated by the deformation of the airtight terminal can be dispersed and relaxed by the connection terminal, and the deformation and breakage of the detection unit due to stress concentration can be avoided. Therefore, the performance of the liquid level sensor can be maintained even when used under severe conditions.
- connection terminal by increasing the rigidity of one side of the connection terminal and having a sufficiently flexible structure on the other side, it is possible to achieve both reliable holding of the detection unit and dispersion / relaxation of stress applied thereto.
- FIG. AA An overhead view of the capacitive liquid level sensor of the present invention
- FIG. AA An overhead view of the liquid level sensor in FIG. AA sectional view of FIG.
- the fragmentary sectional view which shows other embodiment in the liquid level sensor of this invention The fragmentary sectional view which shows other embodiment in the liquid level sensor of this invention Overhead view of conventional liquid level sensor
- the capacitance type liquid level sensor 1 of the present invention is composed of a metal hermetic terminal 2 for mounting on a hermetic electric compressor or the like and a detection unit 3 which is a liquid level detection unit.
- the hermetic terminal 2 includes a cup-shaped metal substrate 4 and conductive pins 6 that pass through the metal substrate and are insulated and fixed by an electrically insulating filler 5 such as glass.
- the detection unit 3 is composed of two metallic liquid level detection electrode plates 7 facing each other in parallel and electrically insulating spacers 8 fixed to both ends of the electrode plate.
- the spacer 8 is previously provided with a hole 8A into which the end of the electrode plate 7 is inserted, and the tip ends of the two electrode plates 7 are inserted and fixed.
- the detection unit 3 is connected and fixed to the conductive pin 6 of the airtight terminal 2 via the connection terminal 9 by welding.
- the connection terminal 9 has a substantially L-shaped cross-sectional shape obtained by bending a metal plate at a bent portion 9A, and is fixed to the electrode plate 7 by welding or the like before constituting the detection unit as described above. Since the connection terminal 9 is welded to the conductive pin 6 in parallel with the electrode plate 7, the welding operation is facilitated without the electrode plate or the conductive pin interfering with the welding electrode. Since the connection terminal 9 is thinner than the electrode plate 7 and bends elastically, the connection terminal 9 is deformed before the electrode is deformed due to misalignment occurring during welding or stress applied to the detection unit during normal handling or use.
- the bent portion 29A of the connection terminal 29 is largely detoured so that the length of the connection terminal is longer than the actual distance between the fixed portions. Therefore, the stress applied to the terminal is not concentrated on a part of the connection terminal but is widely dispersed.
- connection terminal 39A has a highly rigid structure with a thick plate.
- connection terminal 39B has a structure that is thinner and more elastic as it largely bypasses the bent portion 39B1 and extends its entire length, as in the previous embodiment. Therefore, while the connection terminal 39A firmly fixes the detection unit 3 to the lead terminal 6, the connection terminal 39B can elastically absorb strain and dimensional changes that occur during welding.
- a metal plate processed as the connection terminal 39B is shown.
- a structure using plastic deformation by a more flexible conductive wire or the like may be used.
- the detection unit unit is shown in which the end portion of the electrode plate is inserted and fixed into an electrically insulating spacer, but the positional relationship of the electrodes is not shifted when the detection unit is fixed or handled. As long as it can be handled in this way, it is not necessarily the tip. For example, a structure in which the tip of the electrode plate protrudes through the spacer may be used.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Compressor (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims (4)
- 金属板とそこに貫通され気密に絶縁固定された導電ピンにより気密端子が構成され、
その気密端子上に静電容量による液面検出用の電極が設けられた静電容量式液面センサーにおいて、
気密端子上に取付けられる液面検出部は二枚の電極とその電極の位置関係を固定する電気絶縁性のスペーサーからなる検出部ユニットとして構成し、
前記検出部ユニットを二つの導電ピンに対して接続固定する少なくとも一つの接続端子を前記電極が変形を起こすよりも弱い力で変形可能としたことを特徴とする静電容量式液面センサー。 - 前記接続端子は電極よりも薄い金属板で構成されたことにより変形可能としたことを特徴とする請求項1に記載の静電容量式液面センサー。
- 前記接続端子は屈曲部を大きく迂回させて固着部間の実際の距離よりも接続端子の長さを長くとることによって変形可能としたことを特徴とする請求項1または2に記載の静電容量式液面センサー。
- 一方の接続端子は検出部ユニットを充分に保持できるように剛性を高め、
他方の接続端子は充分に柔軟で変形可能としたことを特徴とする請求項1から3のいずれか1項に記載の静電容量式液面センサー。
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/353,436 US9534946B2 (en) | 2011-10-27 | 2012-10-22 | Electrostatic capacitance fluid level sensor |
KR1020147007355A KR101597629B1 (ko) | 2011-10-27 | 2012-10-22 | 정전 용량식 액면 센서 |
RU2014121198/28A RU2567088C1 (ru) | 2011-10-27 | 2012-10-22 | Электростатический емкостный датчик уровня текучей среды |
MYPI2014700926A MY176858A (en) | 2011-10-27 | 2012-10-22 | Electrostatic capacitance fluid level sensor |
EP12843283.8A EP2772731B1 (en) | 2011-10-27 | 2012-10-22 | Electrostatic capacitative liquid surface sensor |
IN3851CHN2014 IN2014CN03851A (ja) | 2011-10-27 | 2012-10-22 | |
BR112014009937-5A BR112014009937B1 (pt) | 2011-10-27 | 2012-10-22 | Sensor de nível de fluido de capacitância eletrostática |
MX2014004893A MX2014004893A (es) | 2011-10-27 | 2012-10-22 | Sensor de superficie liquida capacitivo electrostatico. |
CA2853602A CA2853602C (en) | 2011-10-27 | 2012-10-22 | Electrostatic capacitance fluid level sensor |
CN201280052650.XA CN103906999B (zh) | 2011-10-27 | 2012-10-22 | 静电电容式液面传感器 |
PL12843283T PL2772731T3 (pl) | 2011-10-27 | 2012-10-22 | Elektrostatyczny pojemnościowy czujnik powierzchni płynu |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011235711A JP5838408B2 (ja) | 2011-10-27 | 2011-10-27 | 静電容量式液面センサー |
JP2011-235711 | 2011-10-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013061916A1 true WO2013061916A1 (ja) | 2013-05-02 |
Family
ID=48167748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/077219 WO2013061916A1 (ja) | 2011-10-27 | 2012-10-22 | 静電容量式液面センサー |
Country Status (13)
Country | Link |
---|---|
US (1) | US9534946B2 (ja) |
EP (1) | EP2772731B1 (ja) |
JP (1) | JP5838408B2 (ja) |
KR (1) | KR101597629B1 (ja) |
CN (1) | CN103906999B (ja) |
BR (1) | BR112014009937B1 (ja) |
CA (1) | CA2853602C (ja) |
IN (1) | IN2014CN03851A (ja) |
MX (1) | MX2014004893A (ja) |
MY (1) | MY176858A (ja) |
PL (1) | PL2772731T3 (ja) |
RU (1) | RU2567088C1 (ja) |
WO (1) | WO2013061916A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102137955B1 (ko) * | 2014-01-17 | 2020-07-27 | 엘지전자 주식회사 | 분리형 유면센서 및 이 유면센서를 구비한 압축기 |
JP6534253B2 (ja) * | 2014-10-31 | 2019-06-26 | 株式会社鷺宮製作所 | 液体検知器、圧縮機及び空気調和機 |
JP6579743B2 (ja) * | 2014-10-31 | 2019-09-25 | 株式会社鷺宮製作所 | 液体検知器、圧縮機及び空気調和機 |
JP6706880B2 (ja) * | 2014-10-31 | 2020-06-10 | 株式会社鷺宮製作所 | 液体検知器、圧縮機及び空気調和機 |
JP2016121898A (ja) * | 2014-12-24 | 2016-07-07 | 株式会社鷺宮製作所 | 液体検知器、圧縮機及び空気調和機 |
JP2018004365A (ja) | 2016-06-30 | 2018-01-11 | ローム株式会社 | 反射式検出装置 |
CN109863373B (zh) * | 2016-10-19 | 2021-12-07 | 三菱电机株式会社 | 制冷循环装置 |
RU176260U1 (ru) * | 2017-07-21 | 2018-01-15 | Евгений Николаевич Коптяев | Датчик уровня электролита |
EP3695175B1 (en) | 2017-11-01 | 2023-05-17 | Siam Compressor Industry Co., Ltd. | Refrigerating cycle apparatus |
LU100942B1 (en) * | 2018-10-02 | 2020-04-02 | Luxembourg Patent Co | Capacitive Gauge with Lamellar Electrodes held by Spacer(s) |
JP7159853B2 (ja) * | 2018-12-26 | 2022-10-25 | 株式会社アイシン | タッチセンサ装置 |
JP6778783B2 (ja) * | 2019-04-19 | 2020-11-04 | 株式会社鷺宮製作所 | 液体検知器、圧縮機及び空気調和機 |
CN212658310U (zh) * | 2020-05-08 | 2021-03-05 | 艾默生电气(珠海)有限公司 | 液位传感器 |
WO2022031239A1 (en) * | 2020-08-05 | 2022-02-10 | Siam Compressor Industry Co., Ltd. | A capacitance type liquid level sensor for a compressor |
WO2024134888A1 (ja) * | 2022-12-23 | 2024-06-27 | 株式会社生方製作所 | 静電容量式液体センサ、及び静電容量式液体センサの取り付け方法 |
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- 2012-10-22 RU RU2014121198/28A patent/RU2567088C1/ru active
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Also Published As
Publication number | Publication date |
---|---|
CN103906999B (zh) | 2016-06-22 |
CA2853602C (en) | 2016-11-29 |
KR101597629B1 (ko) | 2016-02-25 |
PL2772731T3 (pl) | 2020-01-31 |
JP2013092491A (ja) | 2013-05-16 |
MY176858A (en) | 2020-08-24 |
CA2853602A1 (en) | 2013-05-02 |
US9534946B2 (en) | 2017-01-03 |
EP2772731A1 (en) | 2014-09-03 |
EP2772731B1 (en) | 2019-09-25 |
RU2567088C1 (ru) | 2015-10-27 |
US20140352429A1 (en) | 2014-12-04 |
BR112014009937B1 (pt) | 2020-10-06 |
BR112014009937A2 (pt) | 2017-04-25 |
KR20140060316A (ko) | 2014-05-19 |
IN2014CN03851A (ja) | 2015-09-04 |
MX2014004893A (es) | 2014-08-01 |
EP2772731A4 (en) | 2015-12-16 |
JP5838408B2 (ja) | 2016-01-06 |
CN103906999A (zh) | 2014-07-02 |
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