EP0981121B1 - Flüssigkeitsmeldeeinrichtung - Google Patents
Flüssigkeitsmeldeeinrichtung Download PDFInfo
- Publication number
- EP0981121B1 EP0981121B1 EP99115631A EP99115631A EP0981121B1 EP 0981121 B1 EP0981121 B1 EP 0981121B1 EP 99115631 A EP99115631 A EP 99115631A EP 99115631 A EP99115631 A EP 99115631A EP 0981121 B1 EP0981121 B1 EP 0981121B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- light
- gap
- detector according
- precipitation
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
- G08B19/02—Alarm responsive to formation or anticipated formation of ice
Definitions
- the invention relates to a liquid sensor, in particular a rain detector, with one light source, one light guide body, with two for the Contact with liquid provided surface sections that such are arranged that the light of the light source by total reflection is deflected by more than 90 °, in particular by approximately 180 °, and with a Light detector, which over the surface sections in light-guiding Connection to the light source can be brought.
- a liquid sensor of this type is known from CH-A-581 830.
- the surface sections intended for contact with liquid are part of a circular cone section with an opening angle of 90 °. This cone section is arranged so that it for level monitoring a container is immersed in the liquid and so to Monitoring the level can serve.
- Liquid sensors can also be used to record precipitation stationary rain detectors are used in the home and garden, to control an automatic drainage system. An institution This type should then be able to withstand dense rain Fog or other precipitation one or more precipitation signals to deliver, upon receipt the irrigation system is switched off can be to over-humidify the monitored area to avoid and to save water. If the one you want or does not require humidification due to lack of precipitation is reached, appropriate signals for switching on the Irrigation system.
- the invention is based, in particular as a stationary task Precipitation device usable liquid sensor to create a reliable distinction between rainfall situation and dry conditions.
- This task is at solved a liquid sensor of the type mentioned above, that at least one between a surface portion of the light body and a counter surface formed gap is provided which Liquid reservoir for precipitation forms. In this gap can Collect precipitation and keep it for a certain time.
- the light guide body can be a Have a circular cone section with an opening angle of approx. 90 ° and the counter surface can be designed as an absorption surface for light be so that when the total reflection in the liquid-filled is no longer present Gap entering light intensity essentially from the counter surface is absorbed and does not reach the detector even as scattered light can.
- the shape and / or the The size of the gap can be adjusted so that the liquid reservoir has an adjustable recording capacity.
- This configuration allows it to set the response threshold for the sensor.
- a appropriate funnel effect can be achieved through suitable design elements achieved on a housing of the precipitation indicator are, for example, by suitable water channels on an outside of the housing, these water channels vertical corrugations on an upper section of a housing and / or obliquely to the vertical on the circumference of a housing can include funnel-shaped converging collecting guides.
- restraining means for restraining can also be used of liquid is provided on the surface portion in the gap be, and these restraining means can be easily as a arranged in the gap wettable element formed from a spacer element determining the shape and / or the size of the gap can exist.
- Such web-like elements for example provide additional wetting areas for the precipitation, the suitably delay the draining or evaporation of the reservoir contents.
- Fig. 1 shows a first embodiment of a stationary on the surface of the earth, for example in a lawn, preferably installed vertically, usable as a rain detector Liquid or rain detector 1, the three of Assemblies that can be assembled by hand without the use of tools having.
- a rain detector Liquid or rain detector 1 the three of Assemblies that can be assembled by hand without the use of tools having.
- an essentially cylindrical basic housing 2 Made of thermoplastic is also a measuring cartridge designated, cartridge-shaped detector top 3 from above used centrally and held in place.
- a cross-shaped in cross-section Mandrel 4 for insertion into the ground is by means of a Union nut in the form of an insert stop Screw plate 5 to a lower external thread attachment 6 of the basic housing 2 screwed on.
- the basic housing 2 which is cylindrical in cross section (FIG. 3), has at its Side walls diametrically opposite to the central axis 7, axial Guide slots 8.
- In the bottom area is a substantially in the center
- Form of an upwardly widening, conical funnel Funnel body 9 is provided, which with radial holding webs 10 the side wall of the base housing 2 is connected and one has central, lower through opening 11, through which the interior of the basic housing 2 with the area of the mandrel 5 in a liquid-conducting manner connected is.
- On the essentially frustoconical inside of the funnel are in the lower area directly above the central opening 11 several web-shaped projections are distributed around the circumference of the funnel 12 provided.
- the measuring cartridge 3 has an injection molded plastic housing 15 with a approximately cylindrical upper portion 16, which is a down downwardly tapered intermediate section 17 and a Connect cylindrical subsection 18. A circular lower one frontal opening of the housing 15 will be more precise by a later explained light guide body 20 sealed watertight.
- the opposite open end of housing 15 is by a screw cap 21 watertight lockable, the internal thread in an external thread of the upper section 16 engages and the inside of which rests on a sealing ring 22 which is in an annular groove on The outer circumference of the upper section 16 is inserted.
- About halfway between the front openings of the housing 15 is transverse to the axis 7 extending partition 23 provided which the interior of the Housing 15 in an upper receiving space 24 for batteries or Accumulators and a cylindrical, lower receiving space 25 for the electronics of the rain detector divided.
- the measuring cartridge is inserted into the basic housing 2 in the axial direction, until the light-guiding body 20 is integral with the funnel body 9 trained projections 12 acting as a spacer of one Opposing body forming funnel body 9 is present. Then the cartridge 3 by means of which can be screwed onto the upper opening of the basic housing 2 Union nut 29 and by means of a Underside of the union nut and on the centering tabs 27, pressure-loaded spring 30 pressed down. The lateral longitudinal webs 26 of the cartridge are tight in the inner recess the union nut 29 and ensure a wobble-free coaxial seat of the measuring cartridge 3 in the basic housing with screwed union nut and tension spring 30.
- the measuring cartridge 3 receives one in its lower receiving space 25 a board 35 constructed and symbolized by this control and Evaluation electronics on a light source in the form of a light emitting diode 36 controls and the one of a light detector in the form of a Photodiode 37 evaluates the generated detector signal.
- the housing 15 of the cartridge 3 appears in two parts with circuit board 35 clamped between double webs 38. It is also possible and preferred to design the cartridge housing in one piece and the circuit board with the light source 36 attached to it, the attached to it Detector, and the light guide to be explained below 20, from below into the cartridge housing.
- the electrical energy for light source, light sensor and for the control and Evaluation electronics 35 are used in the receiving space 24 Batteries or accumulators provided.
- a wired supply can also be used for off-grid supply Supply by a supply device connected to the rain detector 1 respectively.
- the Light emission of the light source 36 may be pulsed, preferably with a small one Clock ratio of, for example, one pulse per minute.
- Plastic existing light guide body 20 which is also shown schematically in FIG. 4 and FIG. 5 is an essential element of the precipitation reporting device 1. It has an upper one in FIG. 1, coaxial to Axial 7 arranged cylindrical section 39, in the diametrical to Axis 7 two blind holes for light source 36 or Light detector 37 are provided. Between these are preferably means that direct light conduction between light source and prevent light detector, for example an opaque one Partition, which is in a central recess of the light guide body is arranged.
- the cylindrical section 39 follows below a circular-conical section 40, the rounded Cone tip with the detector assembled down into the area the opening 11 of the funnel body 9 protrudes.
- Fig. 4 shows a dry state
- Fig. 5 shows a state in precipitation.
- the rain detector emits the pulse, which is preferably activated Light source 36 a surface portion 45 of the conical surface 41 in Area of the gap 43.
- the light falls on the through one Vertical slots defined on surface section 45 in an average angle of incidence of approx. 45 °.
- the gap 43 is filled with air.
- the detector 37 registers a total of 180 ° when dry Weather and switched on light source strong light and the Electronics 35 emits a "dry” message or goes into one "Dry” switching status with regard to an external device, for example an automatic irrigation system.
- the light guide body 20 is due to its tapered shape and Rest on the spacers 12 of the counter body 9 self-centering aligned.
- the spacers 12 are at the lower ends of the Gap regions 43, 44 which are illuminated by the light source 36 and by the Detector 37 are monitored, provided.
- the projections 12 fulfill a further function by the fact that Gap water at the points of this as spacers acting projections can not flow directly down and to End of precipitation the gap areas relevant for the detection 43, 44 stay filled with water for longer.
- Gap areas 43, 44 are not spacer webs or they are at least interrupted to make an unobstructed at these points To allow water to flow away, so that the water is not in the entire cone of the funnel body jams. Furthermore, the Surface areas of the funnel body 9 laterally irradiate or monitored gap sections 43, 44 graded and / or further from Light guide body 20 must be removed in order to rinse out in this area To facilitate dirt particles. The excess water and possibly entrained dirt can pass through the central passage opening 11 the funnel body down and through a lower opening in the Basic housing are discharged to the outside.
- Spacers can be used for a better fit of the prism body on the counter body also in a position rotated by 90 °, for example, can be met then essentially no retention function for the optical Water detection unless it would be a crossed optical Arrangement with two light sources and two detectors used.
- the surface sections 45, 46 relevant for the detection assigned column 43, 44 serve as a precipitation reservoir, through that the detection reliability of the device can be increased. Because a precipitation display is only given if the Amount of precipitation is sufficient to fill the column 43, 44 and a dynamic balance while maintaining the filling between flowing precipitation and flowing and / or evaporating To maintain rainfall. If not a new one If water flows in, the water in the crevices will be drained Capillary forces still held in the crevices and gradually evaporate, the delay time until which the column is filled with air again are, in particular by the geometry of the gap arrangement, in particular the gap width, and the weather (humidity, temperature) is determined.
- the gap geometry for example by choosing a funnel body with higher or flatter spacers, the capacity of the capillary reservoir and thus both the response threshold for a precipitation signal and also the delay time until the dry signal after a precipitation can be set.
- FIG. 6 Another using the same detection principle, also by means of embodiment of a screw-on setting mandrel Rain detector 55 is shown in FIG. 6.
- This embodiment also has a measuring cartridge 56, which is in an approximately cylindrical base housing 57 is introduced from above. However, it is not as in the embodiment 1, fixed by a union nut, but inserted axially into the basic housing 57 and clamped.
- the insertion position, and thus the gap width between the Light guide body 58 and the funnel body 59 formed column 60, 61 in axial extension of light source 62 or light detector 63 is over the insertion depth adjustable.
- the Insertion position defined by stop elements, the insertion depth limit for cartridge 56.
- Precipitation which is on the top and the side surfaces of the over the measuring cartridge protrudes through the basic housing an annular gap-shaped inlet gap 64 except for those at the gaps 60, 61 adjacent surface sections intended for total reflection of the light 65, 66 of the light guide body 58.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Thermally Insulated Containers For Foods (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Optical Measuring Cells (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Extraction Or Liquid Replacement (AREA)
- Massaging Devices (AREA)
Description
- Fig. 1
- einen Längsschnitt durch eine erste Ausführungsform eines erfindungsgemäßen Regenmelders,
- Fig. 2
- eine teilweise geschnittene Seitenansicht des Melderoberteils einer Ausführungsform ähnlich der nach Fig. 1,
- Fig. 3
- einen Querschnitt entlang der Linie III-III in Fig. 1,
- Fig. 4
- eine schematische Darstellung der Lichtleitverhältnisse im Trockenzustand,
- Fig. 5
- eine schematische Darstellung der Lichtleitverhältnisse bei Niederschlag und
- Fig. 6
- einen Längsschnitt durch eine andere Ausfuhrungsform eines Regenmelders.
Claims (11)
- Flüssigkeitsfühler, insbesondere Regenmelder (1; 55), mit einer Lichtquelle (36; 62), einem Lichtleitkörper (20; 58), mit zwei für den Kontakt mit Flüssigkeit vorgesehenen Oberflächenabschnitten (45, 46; 65, 66), die derart angeordnet sind, dass das Licht der Lichtquelle durch Totalreflexion um mehr als 90°, insbesondere um ca. 180°, umgelenkt wird und mit einem Lichtdetektor (37; 63), der über die Oberflächenabschnitte in lichtleitende Verbindung mit der Lichtquelle bringbar ist, dadurch gekennzeichnet, dass mindestens ein zwischen einem Oberflächenabschnitt (45, 46; 65, 66) des Lichtleitkörpers und einer Gegenfläche (42) gebildeter Spalt (43, 44; 60, 61) vorgesehen ist, der ein Flüssigkeitsreservoir für Niederschlag bildet.
- Flüssigkeitsfühler nach Anspruch 1, dadurch gekennzeichnet, dass der Lichtleitkörper (20) einen Kreiskegelabschnitt (40) aufweist, vorzugsweise mit einem Offnungswinkel von ca. 90°.
- Flüssigkeitsfühler nach Anspruch 1, dadurch gekennzeichnet, dass die Gegenfläche (42) als Absorptionsfläche für Licht der Lichtquelle ausgebildet ist.
- Flüssigkeitsfühler nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Form und/oder Größe des Spalts (43, 44; 60, 61) einstellbar ist, so dass das Flüssigkeitsreservoir eine einstellbare Aufnahmekapazität hat.
- Flüssigkeitsfühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Auffangmittel (51, 52) zum Auffangen und/oder Sammeln von Niederschlag vorgesehen sind, die über eine Niederschlagszufuhreinrichtung (50; 64) flüssigkeitsleitend mit dem Flüssigkeitsreservoir (43, 44; 60, 61), verbunden sind.
- Flüssigkeitsfühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an einer oberhalb des Oberflächenabschnitts (45, 46; 65, 66) angeordneten Außenfläche eine im wesentlichen vertikal ausrichtbare Riffelung (51) vorgesehen ist.
- Flüssigkeitsfühler nach Anspruch 5, dadurch gekennzeichnet, dass oberhalb der Oberflächenabschnitte (45, 46; 65, 66) angeordnete, in Richtung des Oberflächenabschnitts trichterartig zusammenlaufende Sammelführungen (52) für Niederschlag vorgesehen sind.
- Flüssigkeitsfühler nach Anspruch 7, dadurch gekennzeichnet, dass die Sammelführungen in Form von an einer Außenfläche der Flüssigkeitsmeldeeinrichtung schräg zur Vertikalen verlaufenden, wendelabschnittsförmigen Leitstegen (52) ausgebildet sind, die unterhalb der Auffangmittel (51) angeordnet sind.
- Flüssigkeitsfühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Rückhaltemittel zum Zurückhalten von Flüssigkeit an dem Oberflächenabschnitt (45, 46; 65, 66) im Spalt (43, 44; 60, 61) vorgesehen sind.
- Flüssigkeitsfühler nach Anspruch 9, dadurch gekennzeichnet, dass die Rückhaltemittel ein im Spalt (43, 44; 60, 61) angeordnetes, benetzbares Element aufweisen, das aus einem die Form und/oder Größe des Spaltes bestimmenden stegartigen Vorsprung (12) besteht.
- Flüssigkeitsfühler nach Anspruch 1, dadurch gekennzeichnet, dass der Spalt (43, 44, 60, 61) so bemessen ist, dass das Flüssigkeitsreservoir ein Kapillarreservoir bildet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19837050A DE19837050A1 (de) | 1998-08-17 | 1998-08-17 | Flüssigkeitsmeldeeinrichtung |
| DE19837050 | 1998-08-17 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0981121A2 EP0981121A2 (de) | 2000-02-23 |
| EP0981121A3 EP0981121A3 (de) | 2000-06-28 |
| EP0981121B1 true EP0981121B1 (de) | 2003-11-12 |
Family
ID=7877637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99115631A Expired - Lifetime EP0981121B1 (de) | 1998-08-17 | 1999-08-07 | Flüssigkeitsmeldeeinrichtung |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6365908B1 (de) |
| EP (1) | EP0981121B1 (de) |
| AT (1) | ATE254324T1 (de) |
| AU (1) | AU771310B2 (de) |
| DE (2) | DE19837050A1 (de) |
| ES (1) | ES2210916T3 (de) |
| ZA (1) | ZA995198B (de) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10353241B3 (de) * | 2003-11-13 | 2005-01-27 | Wilhelm Malitsky | Sensorsystem zur Detektion einer Flüssigkeit |
| US7605361B2 (en) * | 2007-07-09 | 2009-10-20 | Denso Corporation | Fuel property detection device |
| US8593290B2 (en) * | 2009-05-13 | 2013-11-26 | Delaware Capital Formation, Inc. | Overfill detection system for tank trucks |
| US8362453B2 (en) * | 2010-02-24 | 2013-01-29 | Niles Co., Ltd. | Rain sensor |
| US20110219868A1 (en) * | 2010-03-15 | 2011-09-15 | Lane John Michael | Apparatus for detecting snow depth |
| KR101951971B1 (ko) | 2011-06-07 | 2019-02-25 | 메저먼트 스페셜티스, 인크. | 유체 센싱을 위한 광학 센싱 장치 및 그 방법 |
| DE102013100292A1 (de) * | 2013-01-11 | 2014-07-24 | Conti Temic Microelectronic Gmbh | Beleuchtung zur Detektion von Regentropfen auf einer Scheibe mittels einer Kamera |
| WO2018181134A1 (ja) * | 2017-03-27 | 2018-10-04 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置、光検出方法及び燐光検出装置 |
| DE102018216660A1 (de) * | 2018-09-27 | 2020-04-02 | Continental Automotive Gmbh | Berührungssensor, Sensoranordnung und Display |
| CN112504392A (zh) * | 2020-11-11 | 2021-03-16 | 厦门华联电子股份有限公司 | 一种光电液位传感器 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2240988A (en) * | 1938-09-20 | 1941-05-06 | Univ Tennessce Res Corp | Liquid level indicator |
| US3384885A (en) * | 1966-02-21 | 1968-05-21 | Gen Motors Corp | Multiple liquid reservoir liquid level indicator |
| CH581830A5 (en) * | 1975-04-25 | 1976-11-15 | Gfeller Ag Apparate Fabrik Fla | Electro-optical fluid sensor monitor for filling level of container - has light transmissive body with one end shaped as truncated cone |
| DE8218893U1 (de) * | 1982-07-01 | 1982-10-14 | Lang, Heinz, 8000 München | Schneehoehenmessgeraet |
| DE3532199A1 (de) * | 1985-09-10 | 1987-03-12 | Lorenz Dr Twisselmann | Sensor zur regelung der klarsichtigkeit von glasscheiben |
| US4935621A (en) * | 1987-10-30 | 1990-06-19 | Pikulski Joseph L | Optical switch with collimating lenses, antifreeze and/or index matching fluid for control of electrical equipment |
| DE4006174C1 (de) * | 1990-02-28 | 1991-07-25 | Leopold Kostal Gmbh & Co Kg, 5880 Luedenscheid, De | |
| DE4010948A1 (de) * | 1990-04-05 | 1991-10-10 | Fibronix Sensoren Gmbh | Vorrichtung zur optoelektrischen trennschicht- und brechzahlmessung in fluessigkeiten |
| DE4209680A1 (de) * | 1992-03-25 | 1993-09-30 | Bosch Gmbh Robert | Regensensor |
| DE4343474A1 (de) * | 1993-01-13 | 1994-07-21 | Bosch Gmbh Robert | Sensoreinrichtung zur Erfassung des Benetzungs- und/oder Verschmutzungsgrades von Scheiben, insbesondere Frontscheiben von Kraftfahrzeugen |
| US5381022A (en) * | 1993-12-10 | 1995-01-10 | Imo Industries, Inc. | Combined optical waveguide and prismatic liquid-level sensor |
| US5534708A (en) * | 1993-12-15 | 1996-07-09 | Simmonds Precision Products Inc. | Optical fuel/air/water sensor and detector circuit |
| US5507326A (en) * | 1994-08-05 | 1996-04-16 | Scully Signal Company | Fluid overfill protection and product identification system |
| US5505082A (en) * | 1995-02-01 | 1996-04-09 | Cushman; Robert B. | Rainfall rate gauge |
-
1998
- 1998-08-17 DE DE19837050A patent/DE19837050A1/de not_active Withdrawn
-
1999
- 1999-08-07 AT AT99115631T patent/ATE254324T1/de not_active IP Right Cessation
- 1999-08-07 EP EP99115631A patent/EP0981121B1/de not_active Expired - Lifetime
- 1999-08-07 ES ES99115631T patent/ES2210916T3/es not_active Expired - Lifetime
- 1999-08-07 DE DE59907693T patent/DE59907693D1/de not_active Expired - Lifetime
- 1999-08-16 ZA ZA9905198A patent/ZA995198B/xx unknown
- 1999-08-16 US US09/374,948 patent/US6365908B1/en not_active Expired - Fee Related
- 1999-08-17 AU AU44545/99A patent/AU771310B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP0981121A3 (de) | 2000-06-28 |
| EP0981121A2 (de) | 2000-02-23 |
| ATE254324T1 (de) | 2003-11-15 |
| ES2210916T3 (es) | 2004-07-01 |
| AU4454599A (en) | 2000-03-09 |
| DE19837050A1 (de) | 2000-02-24 |
| ZA995198B (en) | 2000-02-18 |
| AU771310B2 (en) | 2004-03-18 |
| US6365908B1 (en) | 2002-04-02 |
| DE59907693D1 (de) | 2003-12-18 |
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