EP3458817A1 - Lecksensor - Google Patents
LecksensorInfo
- Publication number
- EP3458817A1 EP3458817A1 EP17723306.1A EP17723306A EP3458817A1 EP 3458817 A1 EP3458817 A1 EP 3458817A1 EP 17723306 A EP17723306 A EP 17723306A EP 3458817 A1 EP3458817 A1 EP 3458817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- housing
- capacitor
- gap
- lubricant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 239000000314 lubricant Substances 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
-
- 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
- G01F23/266—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 measuring circuits therefor
Definitions
- the invention relates to an arrangement according to the preamble of claim 1.
- Capacitive oil level sensors are known from the prior art. These use a capacitor to detect the presence of oil. As the oil enters a gap between the electrodes of the capacitor, its dielectric constant changes. Such a sensor can be used to determine whether the level in an oil sump exceeds or falls below a certain threshold value.
- the capacitive oil sensors known from the prior art are not suitable for detecting oil leaks.
- a passage of a shaft through a transmission housing is at risk of such leakage.
- the arrangement comprises at least one shaft, at least one housing and at least one capacitor.
- the arrangement is part of a transmission, such as a transmission of a wind turbine.
- the shaft passes through an opening in the housing. This means that a first part of the shaft is outside the housing and a second part of the shaft is inside the housing.
- the shaft may be a drive or output shaft.
- the opening is designed as a through hole.
- a first electrode and a second electrode of the capacitor form a gap.
- the gap thus extends between the first electrode and the second electrode.
- the gap is preferably filled with air.
- the condenser is arranged so that a lubricant, which exits through the opening from the housing, at least partially enters the gap. If it is an air-filled gap, at least part of the air is displaced by the lubricant.
- the lubricant changes a dielectric constant of the capacitor. Such a change suggests leaked lubricant.
- the arrangement preferably has an evaluation unit which is designed to determine the dielectric constant of the capacitor and to detect a change in the dielectric constant.
- the border is part of a surface of the housing which surrounds the opening. This part of the surface connects an interior with an outer or an environment of the housing.
- the opening has two mouths. Both mouths each form an edge of said part of the surface.
- the condenser is arranged so that not only escaping lubricant at least partially enters the gap, but conversely, no lubricant enters the gap when the lubricant does not exit through the opening of the housing. This means that lubricant will at least partially enter the gap when the lubricant escapes from the gap. As a result, the change in the dielectric constant of the capacitor is a clear indication of a lubricant leak.
- the capacitor is preferably arranged outside the housing. This ensures that no lubricant that does not escape through the opening from the housing gets into the gap.
- the first electrode and / or the second electrode are rotationally symmetrical with respect to an axis of symmetry which is identical to a rotation axis of the shaft. In this way, it is possible reliably to prevent the lubricant emerging through the opening from flowing out of the housing from flowing past the gap and, as a result, being unable to be detected.
- the first electrode may be attached to the housing and the second electrode may be mounted on the shaft.
- the shaft may form the second electrode or be integrally connected to at least a part of the second electrode.
- Fig. 1 a circuit arrangement
- Fig. 2 is a leakage sensor.
- the circuit arrangement shown in FIG. 1 comprises a Wheatstone bridge 101 and an operational amplifier 103.
- the Wheatstone bridge 101 in turn has a first capacitor 105, a second capacitor 107, a first ohmic resistor 109 and a second ohmic resistor 111.
- a first pole of the first capacitor 105 and a first terminal of the first ohmic resistor 109 are connected to one another via a first electrical connection 113.
- a second terminal of the first ohmic resistor 109 and a first terminal of the second ohmic resistor 111 via a second electrically conductive connection 115, a second terminal of the second ohmic resistor 111 and a first pole of the second capacitor 107 via a third electrically conductive connection 117th and a second terminal of the second capacitor 107 and a second terminal of the first capacitor 115 are connected via a fourth electrically conductive connection 119.
- the Wheatstone bridge 101 is subjected to an alternating voltage which drops between the first electrically conductive connection 113 and the third electrically conductive connection 117.
- the operational amplifier 113 picks up a voltage dropped between the second electrically conductive connection 115 and the fourth electrically conductive connection 119.
- the first capacitor 105 is arranged so that fills a gap between its first pole and its second pole in case of failure with oil. As a result, its dielectric constant changes. This can be detected at an output of the operational amplifier 103 by means of an evaluation unit.
- the first capacitor 105 has the shape of a lateral surface of a straight circular cylinder.
- the first capacitor 105 can be secured in a transmission housing.
- an evaluation unit 203 comprising the Wheatstone bridge shown in FIG. 1 is also attached to the cover 201.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016208764.9A DE102016208764A1 (de) | 2016-05-20 | 2016-05-20 | Lecksensor |
| PCT/EP2017/060343 WO2017198445A1 (de) | 2016-05-20 | 2017-05-02 | Lecksensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3458817A1 true EP3458817A1 (de) | 2019-03-27 |
Family
ID=58707504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17723306.1A Withdrawn EP3458817A1 (de) | 2016-05-20 | 2017-05-02 | Lecksensor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20190120680A1 (de) |
| EP (1) | EP3458817A1 (de) |
| CN (1) | CN109154520A (de) |
| DE (1) | DE102016208764A1 (de) |
| WO (1) | WO2017198445A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2622442A (en) * | 1949-06-10 | 1952-12-23 | Phillips Petroleum Co | Apparatus for measuring liquid levels |
| US3520638A (en) * | 1968-04-08 | 1970-07-14 | Richard Huttenlocher | Means and apparatus for sensing and controlling material levels |
| DE2343752A1 (de) * | 1973-08-30 | 1975-03-13 | Eickhoff Geb | Antriebsmotor fuer im untertagebergbau eingesetzte gewinnungsmaschinen, insbesondere walzenschraemmaschinen |
| GB2122356B (en) * | 1982-06-11 | 1986-02-05 | Exxon Research Engineering Co | Flow rate detector |
| GB0300664D0 (en) * | 2003-01-11 | 2003-02-12 | Rolls Royce Plc | Sensing film material |
| DE102016204979A1 (de) * | 2015-03-27 | 2016-09-29 | Aktiebolaget Skf | Kapazitätsmessung in einem Lagergehäuse |
-
2016
- 2016-05-20 DE DE102016208764.9A patent/DE102016208764A1/de not_active Withdrawn
-
2017
- 2017-05-02 CN CN201780030046.XA patent/CN109154520A/zh active Pending
- 2017-05-02 US US16/302,686 patent/US20190120680A1/en not_active Abandoned
- 2017-05-02 WO PCT/EP2017/060343 patent/WO2017198445A1/de not_active Ceased
- 2017-05-02 EP EP17723306.1A patent/EP3458817A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016208764A1 (de) | 2017-11-23 |
| US20190120680A1 (en) | 2019-04-25 |
| WO2017198445A1 (de) | 2017-11-23 |
| CN109154520A (zh) | 2019-01-04 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20181115 |
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| AK | Designated contracting states |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20190718 |