DK173785B1 - Detector for detecting fluid leaks - Google Patents
Detector for detecting fluid leaks Download PDFInfo
- Publication number
- DK173785B1 DK173785B1 DK60297A DK60297A DK173785B1 DK 173785 B1 DK173785 B1 DK 173785B1 DK 60297 A DK60297 A DK 60297A DK 60297 A DK60297 A DK 60297A DK 173785 B1 DK173785 B1 DK 173785B1
- Authority
- DK
- Denmark
- Prior art keywords
- sensor
- detector
- drop
- base body
- detector according
- Prior art date
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Classifications
-
- 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
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
-
- 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
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/183—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for pipe joints or seals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Examining Or Testing Airtightness (AREA)
Description
DK 173785 B1DK 173785 B1
Opfindelsen angår en detektor til sporing af væskelækager i hygiejniske procesanlæg eller procesanlægsenheder, fortrinsvis pumper, homogenisatorer og lignende apparater, hvor der anvendes akseltætninger, og hvor der i tilfælde af væskelækage ved disse forekommer faldende væskedråber, i hvilken detektor der anvendes et med dråbefang 5 forsynet basislegeme, ved hvilket der er monteret mindst én elektrisk føler.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a detector for detecting liquid leaks in hygienic process plants or process plant units, preferably pumps, homogenizers and similar apparatus where shaft seals are used and where in the case of liquid leakage there are falling liquid droplets in which a detector 5 is used. base body, on which is mounted at least one electrical sensor.
Der kendes en detektor til sporing af væskelækager ved akseltætninger i pumper, og hvor føleren sidder i bunden af et kar til opsamling af lækagevæske. Detektoren aktiveres først, når en bestemt væskestand i karret er nået. Denne detektor er ret kompliceret, fordi den kræver tilstedeværelse af et opsamlingskar (evt. en opsamlingsbeholder), 10 hvilket gør konstruktionen ret indviklet og dermed dyr. Samtidigt er detektoren ikke hygiejnisk, da der er mulighed for bakterievækst i opsamlingskarret.A detector is known for detecting fluid leaks by shaft seals in pumps and where the sensor is located at the bottom of a vessel for collecting leakage fluid. The detector is only activated when a certain liquid level in the vessel is reached. This detector is quite complicated because it requires the presence of a collection vessel (possibly a collection vessel), which makes the structure quite complicated and thus expensive. At the same time, the detector is not hygienic, as there is the possibility of bacterial growth in the collection vessel.
Desuden kendes fra engelsk offentliggørelsesskrift nr. 2.199.436 et apparat til detektering af væske, der måtte lække fra en maskine, f.eks. en vaskemaskine. Apparatet består dels af en opsamlingsbakke, dels af en egentlig detektor. Det er først, når dråben 15 når frem til detektoren, at apparatet giver udslag. Opsamlingsbakken er forholdsvis stor, idet den arealmæssigt svarer til undersiden af vaskemaskinen. Dette detekteringsapparat er ikke så sensitivt som ønskeligt, fordi en dråbe skal løbe langt, før den detekteres. Desuden fylder det meget.In addition, from British Patent Specification No. 2,199,436, an apparatus for detecting liquids that may leak from a machine, e.g. a washing machine. The apparatus consists partly of a collection tray and partly of an actual detector. It is only when the droplet 15 reaches the detector that the device gives off. The collection tray is relatively large in that it corresponds in area to the underside of the washing machine. This detection device is not as sensitive as desirable because a drop must run far before it is detected. Besides, it fills a lot.
Formålet med opfindelsen er at anvise en detektor af den ovenfor nævnte art, og som er 20 mere sensitiv og ikke fylder så meget som kendt.The object of the invention is to provide a detector of the above-mentioned type which is more sensitive and does not fill as much as known.
Detektoren ifølge opfindelsen er ejendommelig ved, at der i basislegemet og udgående fra dråbefanget findes en skrå væskebortledningsrende uden tilslutning dl en opsamlingsenhed, og at nævnte mindst ene føler er monteret i bortledningsrenden og indrettet dl at detektere den enkelte dråbe, medens denne passerer gennem renden, hvilken føler indgår 25 i et følerkredsløb i eller ved basislegemet. Herved opnås, at detektoren bliver mere sensitiv og fylder mindre end kendt. Dette fordi den enkelte dråbe under sin passage DK 173785 B1 2 gennem den skrå rende meget hurtigt vil registreres af føleren. Basislegemet kan være lille. I øvrigt opnås en særlig enkel og billig konstruktion, og detektoren er desuden let at montere på alle procesanlæg eller procesanlægsenheder. Den enkelte dråbe vil efter at have passeret detektoren fordampe. Et uhygiejnisk opsamlingskar er unødvendigt.The detector according to the invention is characterized in that in the base body and starting from the droplet, there is an inclined liquid discharge channel without connection dl a collecting unit, and said at least one sensor is mounted in the drainage channel and arranged to detect the individual droplet as it passes through the channel. which sensor is included in a sensor circuit in or at the base body. This results in the detector becoming more sensitive and filling less than known. This is because the individual droplet will be detected by the sensor very quickly during its passage through the inclined channel. The base can be small. In addition, a particularly simple and inexpensive design is obtained, and the detector is also easy to mount on any process plant or process unit. The single drop will evaporate after passing the detector. An unhygienic collection vessel is unnecessary.
5 Ifølge opfindelsen kan de elektriske følere være en del af en elektrisk svingningskreds til kapacitiv aflastning af den passerende dråbe, idet en første føler er anbragt i lille afstand over rendens bundvæg, og en anden elektrisk føler er indlagt, f.eks. indstøbt, i basislegemet. Derved opnås en særlig pålidelig detektering af dråberne.According to the invention, the electric sensors may be part of an electric oscillation circuit for capacitively relieving the passing drop, a first sensor being located at a small distance above the bottom wall of the gutter and a second electric sensor being inserted, e.g. cast, in the base body. This provides a particularly reliable detection of the droplets.
Desuden kan ifølge opfindelsen de elektriske følere være indrettet til konduktiv aftast-10 ning og udgøres af to i indbyrdes afstand i rendens bundvæg anbragte følerlegemer, mellem hvilke der er pålagt en elektrisk spænding til sikring af afgivelse af et elektrisk signal, når en dråbe passerer følerne. Herved bliver detektoren særlig simpel at fremstille.In addition, according to the invention, the electric sensors can be arranged for conductive scanning and consist of two sensing bodies located at spaced apart intervals between the gutter, between which an electrical voltage is applied to ensure the delivery of an electrical signal when a drop passes the sensors. . This makes the detector particularly simple to manufacture.
Endvidere kan ifølge opfindelsen basislegemet have en i hovedsagen lodret bagvæg eller 15 -flade med fastgørelsesorganer til fastgørelse af detektoren på procesanlægget eller procesanlægsenheden, f.eks. ved limning, fastskruning eller ved magnetisk fastgørelse.Furthermore, according to the invention, the base body may have a substantially vertical rear wall or surface with attachment means for attaching the detector to the processing plant or processing unit, e.g. by gluing, fastening or by magnetic fastening.
Man muliggør herved en meget pålidelig fiksering af detektoren i passende afstand neden under det mulige lækagested i procesanlægget eller på procesanlægsenheden.This enables a very reliable fixation of the detector at a suitable distance below the possible leakage point in the processing plant or on the processing plant unit.
Ifølge opfindelsen kan basislegemet være af elektrisk isolerende materiale, såsom plast, 20 især epoxyharpiks, hvori eller hvorpå mindst en af følerne er indstøbt eller påsat, hvorved detektoren bliver særlig billig at fremstille samtidig med, at følerne eller følerlege-meme i elektrisk henseende bliver bedre isoleret. Detektoren vil kun reagere, når en dråbe passerer i renden.According to the invention, the base body may be of electrically insulating material, such as plastic, in particular epoxy resin, in which or at least one of the sensors is embedded or mounted, thereby making the detector particularly inexpensive to manufacture at the same time as the sensors or sensor bodies are electrically improved. isolated. The detector will only respond when a drop passes in the gutter.
Endelig kan ifølge opfindelsen detektorens følerkredsløb være tilsluttet én eller flere 25 signalbehandlingsenheder, såsom en PLC og/eller en computer, til afgivelse af ét eller DK 173785 B1 3 flere styresignaler, når signalet eller signalerne fra den eller de nævnte følere eller følerlegemer overskrider en forudbestemt tærskelværdi. Herved opnås, at detektoren kan indstilles til først at slå egentlig alarm, når den nævnte tærskelværdi er passeret, hvilket f.eks. kan være, når væskelækagen har nået en størrelse, hvor antallet af de gennem 5 basislegemets rende flydende dråber pr. tidsenhed er så stort, at den væske, der lander på gulvet under detektoren, ikke kan nå at fordampe, inden nye dråber når gulvet.Finally, according to the invention, the sensor circuit of the detector may be connected to one or more signal processing units, such as a PLC and / or a computer, for delivering one or more control signals when the signal (s) of said sensor (s) exceeds a predetermined threshold. Hereby it is achieved that the detector can only be set to sound the actual alarm when the said threshold has been passed, which e.g. can be when the fluid leakage has reached a size where the number of liquid droplets through the base body time unit is so large that the liquid that lands on the floor below the detector cannot evaporate before new drops reach the floor.
Endelig kan ifølge opfindelsen frekvensændringen af svingningskredsen anvendes som mål for, om en dråbe har passeret bortledningsrenden.Finally, according to the invention, the frequency change of the oscillation circuit can be used as a measure of whether a drop has passed the drainage channel.
Opfindelsen forklares nedenfor under henvisning til tegningen, hvor 10 fig. 1 viser en udførelsesform for detektoren ifølge opfindelsen set i perspektiv, fig. 2 samme monteret under en akseltætning på en centrifugalpumpe, fig. 3 enudførelsesform for detektoren ifølge opfindelsen, hvor aflastningen af dråberne sker konduktivt, fig. 4 en udførelsesfonn for detektoren, hvor aflastningen af dråberne sker kapacitivt, 15 og fig, 5 et følerkredsløb, som er tilsluttet en signalbehandlingsenhed.The invention is explained below with reference to the drawing, in which FIG. 1 is a perspective view of an embodiment of the detector according to the invention; FIG. 2 shows the same mounted under a shaft seal on a centrifugal pump; FIG. Fig. 3 shows one embodiment of the detector according to the invention, where the droplets are relieved conductively; 4 shows an embodiment of the detector in which the drops are discharged capacitively; FIG. 5 is a sensor circuit connected to a signal processing unit.
Den i fig. 1 viste detektor 1 er beregnet til sporing af væskelækager i hygiejniske procesanlæg eller procesanlægsenheder, såsom centrifugalpumper og homogenisatorer, særlig ved disses akseltætninger.The FIG. 1, the detector 1 is intended for detecting fluid leaks in hygienic process units or process units such as centrifugal pumps and homogenizers, especially at their shaft seals.
DK 173785 B1 4 I fig. 2 ses en sådan centrifugalpumpe 2, der har en akseltæthing antydet ved 3. Såfremt der sker en væskelækage ved denne tætning, vil væskedråber 4 falde som antydet og blive opsamlet af detektoren 1 ifølge opfindelsen.DK 173785 B1 4 In fig. 2, such a centrifugal pump 2 having a shaft seal indicated at 3. is seen. If a liquid leak occurs at this seal, liquid droplets 4 will drop as indicated and be collected by the detector 1 according to the invention.
Den i fig. 1 viste detektor består af et basislegeme 5, som har et dråbefang 6, som 5 nedadtil udmunder i en væskebortledningsrende 7. Denne er ikke tilsluttet nogen opsamlingsenhed, såsom en beholder eller et kar; de væskedråber, der passerer gennem renden, vil altså falde ned på den flade, på hvilken centrifugalpumpen er opstillet. Da dråberne må antages at forekomme meget sjældent og desuden breder sig ud på den store gulvflade, når de rammer denne, må man gå ud fra, at dråberne fordamper hurtigt I 10 bortledningsrenden er der monteret mindst en elektrisk føler 9a, 9b, der er indrettet til at detektere den enkelte dråbe 4, når denne passerer renden. Føleren indgår i et i eller ved basislegemet 1 anbragt følerkredsløb 12, som er påført en elektrisk spænding via en terminal 13. Følerkredsløbets minusteiminal er antydet ved 13*. I fig. 1 er kredsløbet indlagt eller indstøbt i basislegemet 1.The FIG. 1, the detector 1 consists of a base body 5 having a drop catch 6, which 5 extends downwardly into a liquid conduit channel 7. This is not connected to any collection unit, such as a container or vessel; the liquid droplets passing through the gutter will thus fall onto the surface on which the centrifugal pump is mounted. Since the droplets are assumed to occur very infrequently and in addition spread out on the large floor surface when they hit it, it must be assumed that the droplets evaporate rapidly. At least one electrical sensor 9a, 9b is installed which is arranged to detect the individual drop 4 as it passes the gutter. The sensor is included in a sensor circuit 12 located in or at the base body 1, which is applied to an electrical voltage via a terminal 13. The minimum circuit of the sensor circuit is indicated by 13 *. In FIG. 1, the circuit is inserted or embedded in the base body 1.
15 Som vist i fig. 4 kan de elektriske følere udgøre en del af en elektrisk svingningskreds 12* til kapacitiv aflastning af de passerende vanddråber, idet den første elektriske føler 19a kan være anbragt i lille afstand oven over rendens bund, medens den anden elektriske føler 19b kan være indlagt, f.eks. indstøbt, i basislegemet 5.15 As shown in FIG. 4, the electric sensors may form part of an electric oscillation circuit 12 * for capacitive relief of the passing water drops, the first electric sensor 19a being located at a small distance above the bottom of the gutter, while the second electric sensor 19b may be inserted; .g. embedded, in the base body 5.
Som vist i fig. 1 og 3 kan de elektriske følere være indrettet til konduktiv aflastning, idet 20 følerlegememe 9a og 9b er anbragt i indbyrdes afstand i rendens 7 bundvæg. Eventuelt kan de to følerlegemer rage op af renden således som vist i fig. 3.As shown in FIG. 1 and 3, the electric sensors may be arranged for conductive relief, the sensing bodies 9a and 9b being spaced apart in the bottom wall of the channel 7. Optionally, the two sensor bodies may project from the gutter as shown in FIG. Third
I fig. 3 ses, hvorledes basislegemets 5 i hovedsagen lodrette bagvæg eller -flade 15 kan have fastgørelsesorganer 17a, 17b til fastgørelse af detektoren på procesanlægget eller procesanlægsenheden. Fastgørelsesorganeme kan som vist være beregnet til fastskruning 25 af detektoren, men kan også udformes som lim-fastgørelsesdele eller som magnetiske fastgørelsesdele.In FIG. 3 shows how the substantially vertical rear wall or surface 15 of the base body 5 may have fasteners 17a, 17b for securing the detector to the processing plant or processing unit. The fasteners may, as shown, be intended for securing 25 to the detector, but may also be formed as adhesive fasteners or as magnetic fasteners.
DK 173785 B1 5DK 173785 B1 5
Basislegemet 5 kan være af elektrisk isolerende materiale, såsom plast, især epoxyharpiks, hvori eller hvorpå mindst en af følerne er indstøbt eller påsat.The base body 5 may be of electrically insulating material, such as plastic, in particular epoxy resin, wherein or at least one of the sensors is molded or affixed.
I fig. 5 ses skematisk, hvorledes følerkredsløbet 12 i basislegemet 5 (kun følerkredsløbets terminaler er vist) kan være tilsluttet en signalbehandlingsenhed 20, såsom en PLC 5 og/eller en computer. V er en påtrykt jævn- eller vekselspænding. En af de øvrige terminaler af følerkredsløbet er tilsluttet jord sammen med minusterminalen af PLC. Enheden 20 kan være indrettet til at afgive et styresignal, når signalet eller signalerne fra den eller de nævnte følere 9a, 9b, 19a, 19b overskrider en forudbestemt tærskelværdi. Signalbehandlingsenheden 20 kan f.eks. være således indrettet, at den først afgiver 10 styresignalet, når/hvis antallet af passerende dråber har nået en bestemt størrelse. I signalbehandlingsenheden 20 kan også indlægges en genkendelsesfunktion, så at enheden kan skelne mellem en "ren" dråbe og eventuelle smudspartikler. Enheden 20 kan indgå i en ikke-vist overordnet styring med eventuel alarmfunktion.In FIG. 5 shows schematically how the sensor circuit 12 in the base body 5 (only the terminals of the sensor circuit are shown) can be connected to a signal processing unit 20, such as a PLC 5 and / or a computer. V is a applied DC or AC voltage. One of the other terminals of the sensor circuit is connected to ground along with the minimum terminal of the PLC. The unit 20 may be arranged to output a control signal when the signal (s) of said sensor (s) 9a, 9b, 19a, 19b exceeds a predetermined threshold value. The signal processing unit 20 may e.g. be arranged so that it only emits the control signal when / if the number of passing drops has reached a certain size. In the signal processing unit 20, a recognition function can also be incorporated so that the unit can distinguish between a "pure" drop and any dirt particles. The unit 20 may be included in a non-displayed overall control with possible alarm function.
I forbindelse med fig. 4 skal nævnes, at man i den elektriske svingningskreds 12' kan 15 anvende svingningskredsens frekvensændrmg som mål for, om en dråbe har passeret.In connection with FIG. 4 it should be mentioned that in the electric vibration circuit 12 ', the frequency change of the vibration circuit can be used as a measure of whether a drop has passed.
Følerkredsløbet kan være anbragt på et printkort, som er enten indstøbt eller indlagt i basislegemet 5.The sensor circuit may be located on a circuit board which is either embedded or inserted into the base body 5.
Detektoren kan ændres på mange måder, uden at man derved ændrer ved dens idé.The detector can be changed in many ways without changing its idea.
Således kan basislegemet 5 som vist i fig. 3 være i hovedsagen kileformet, idet dråbefan-20 get 6 og renden 7 så er tildannet i kilens øvre skråflade.Thus, as shown in FIG. 3 is generally wedge-shaped, the droplet 6 and the gutter 7 being formed in the upper oblique surface of the wedge.
Claims (7)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK60297A DK173785B1 (en) | 1997-05-27 | 1997-05-27 | Detector for detecting fluid leaks |
| DE19882365T DE19882365T1 (en) | 1997-05-27 | 1998-05-20 | Liquid leakage detector |
| PCT/DK1998/000201 WO1998054559A1 (en) | 1997-05-27 | 1998-05-20 | Fluid leakage detector |
| AU74250/98A AU7425098A (en) | 1997-05-27 | 1998-05-20 | Fluid leakage detector |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK60297 | 1997-05-27 | ||
| DK60297A DK173785B1 (en) | 1997-05-27 | 1997-05-27 | Detector for detecting fluid leaks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK60297A DK60297A (en) | 1998-11-28 |
| DK173785B1 true DK173785B1 (en) | 2001-10-08 |
Family
ID=8095441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK60297A DK173785B1 (en) | 1997-05-27 | 1997-05-27 | Detector for detecting fluid leaks |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU7425098A (en) |
| DE (1) | DE19882365T1 (en) |
| DK (1) | DK173785B1 (en) |
| WO (1) | WO1998054559A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0402401D0 (en) * | 2004-02-04 | 2004-03-10 | Rolls Royce Plc | A leakage drain |
| DE102004040106B3 (en) | 2004-07-26 | 2006-04-27 | Carl Freudenberg Kg | Device for detecting a leak |
| JP5609710B2 (en) * | 2011-02-23 | 2014-10-22 | 富士通株式会社 | Dew condensation detection device, electronic device, and dew condensation detection method |
| EP3460440A1 (en) * | 2017-09-20 | 2019-03-27 | Grundfos Holding A/S | Pump seal leakage detection system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3770002A (en) * | 1971-11-01 | 1973-11-06 | L Brown | Automatic water shut-off system |
| US4502044A (en) * | 1982-05-19 | 1985-02-26 | Farris James R | Moisture alarm system |
| US4520667A (en) * | 1983-09-07 | 1985-06-04 | Nelson Joseph A | Nonmechanical digital raingauge |
| DE3411721C1 (en) * | 1984-03-29 | 1985-04-11 | Deutsche Gesellschaft für Wiederaufarbeitung von Kernbrennstoffen mbH, 3000 Hannover | Shielded, highly radioactive, wet-chemical cell of a nuclear facility with a device for drip-spot detection and method for use in such a cell |
| US4673926A (en) * | 1985-02-12 | 1987-06-16 | Gorman Walter T | Liquid containment and leak detection system |
| GB2199436A (en) * | 1986-11-28 | 1988-07-06 | B & R Electrical Prod Ltd | Detection of fluid leakage |
| US4827766A (en) * | 1987-06-11 | 1989-05-09 | Nelson Joseph A | Dual filter, drop based, digital raingauge |
| GB9223774D0 (en) * | 1992-11-13 | 1993-01-06 | O Dea Francis J | Means for detecting water leakages from appliances |
| US5339676A (en) * | 1993-06-02 | 1994-08-23 | Del Johnson | Water leak detection, collection and support device |
-
1997
- 1997-05-27 DK DK60297A patent/DK173785B1/en not_active IP Right Cessation
-
1998
- 1998-05-20 DE DE19882365T patent/DE19882365T1/en not_active Ceased
- 1998-05-20 WO PCT/DK1998/000201 patent/WO1998054559A1/en active Application Filing
- 1998-05-20 AU AU74250/98A patent/AU7425098A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DK60297A (en) | 1998-11-28 |
| DE19882365T1 (en) | 2000-06-15 |
| AU7425098A (en) | 1998-12-30 |
| WO1998054559A1 (en) | 1998-12-03 |
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