DE3525069A1 - Elastic seal for housings - Google Patents
Elastic seal for housingsInfo
- Publication number
- DE3525069A1 DE3525069A1 DE19853525069 DE3525069A DE3525069A1 DE 3525069 A1 DE3525069 A1 DE 3525069A1 DE 19853525069 DE19853525069 DE 19853525069 DE 3525069 A DE3525069 A DE 3525069A DE 3525069 A1 DE3525069 A1 DE 3525069A1
- Authority
- DE
- Germany
- Prior art keywords
- seal according
- housing seal
- housing
- pressure
- outer electrode
- 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- Withdrawn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
- 238000012806 monitoring device Methods 0.000 claims abstract description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims 1
- 239000004020 conductor Substances 0.000 claims 1
- 239000011241 protective layer Substances 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
Abstract
Description
Es ist bekannt, zur Abdichtung des Gehäuseinnenraums zwischen Gehäuse und Deckel eine elastische Dichtung, beispielsweise einen O-Ring einzusetzen, welcher durch mechanische Spannmittel unter Druck gehalten wird. Die Erfindung befaßt sich mit der Aufgabe, die Abdichtung eines solchen Gehäuses zu überwachen. Hierzu besteht die Dichtung aus einem radial polarisierten piezo elektrischen Koaxialkabel mit Innen- und Außenelektrode und beide Elektroden sind an eine Drucküberwachungsein richtung angeschlossen. Diese kann sich innerhalb oder außerhalb des Gehäuses befinden. Steht das Gehäuseinnere unter einem Über- oder Unterdruck und wird das Gehäuse oder seine Abdichtung undicht, so ändert sich der auf die Dichtung und damit auf das Piezokabel einwirkende Druck. Diese Druckänderungen werden von dem piezoelek trischen Material in eine elektrische Spannung umge wandelt, die mit der elektronischen Drucküberwachungs einrichtung festgestellt und gegebenenfalls angezeigt oder zur Auslösung eines Alarms ausgenutzt werden kann. Die neue Dichtung kann jedoch auch auf Änderungen des Außendrucks ansprechen. Wird sie beispielsweise zur Ab dichtung eines Minengehäuses benutzt, so kann sie zu gleich als Drucksensor dienen, um beispielsweise beim Ansprengen der Minen oder beim Beschuß des Minenfeldes auftretende Druckwellen zu erfassen, und ein vorzeitiges Scharfwerden der Minen durch derartige Minenräummaßnahmen verhindern. Andererseits kann die Drucküberwachungsein richtung auch derart ausgebildet sein, daß beim Über fahren der Mine auftretende Druckbeanspruchungen durch das piezoelektrische Koaxialkabel und die Drucküber wachungseinrichtung in einen elektrischen Auslösebefehl umgewandelt werden.It is known to seal the interior of the housing an elastic seal between the housing and cover, for example to use an O-ring, which by mechanical clamping device is kept under pressure. The Invention is concerned with the task of sealing to monitor such a housing. There is the seal from a radially polarized piezo electrical coaxial cable with inner and outer electrodes and both electrodes are connected to a pressure monitor direction connected. This can be inside or are outside the housing. Is the inside of the housing under a positive or negative pressure and the housing or if its seal leaks, it changes to the seal and thus acting on the piezo cable Print. These pressure changes are caused by the piezoelek material into an electrical voltage converts that with electronic pressure monitoring establishment determined and displayed if necessary or can be used to trigger an alarm. However, the new seal can also be changed Address external pressure. For example, if it becomes Ab used a mine housing seal, so it can immediately serve as a pressure sensor, for example when Starting the mines or firing at the minefield to detect occurring pressure waves, and a premature The mines become sharpened by such demining measures prevent. On the other hand, pressure monitoring can be direction should also be designed such that when over drive the mine through pressure loads the piezoelectric coaxial cable and the pressure over monitoring device in an electrical trigger command being transformed.
Die Innenelektrode kann als Draht oder als Rohr, bei spielsweise eine Innenmetallisierung des piezoelektrischen Hohlrohrs, ausgebildet sein. Die Außenelektrode besteht entweder aus einer durchgehenden Metallschicht oder aus einem bei Koaxialkabeln üblichen Abschirmgeflecht. Als piezoelektrisches Material findet vorzugsweise Polyvinyliden fluorid (PVDF bzw. PVF2) Verwendung, welches sich bekannt lich durch eine hohe Flexibilität auszeichnet. Elektronische Überwachungsschaltungen, die auf die Ausgangssignale piezo elektrischer Sensoren ansprechen, sind bekannt. Sie werden beispielsweise in Hydrophonen, Einbruchsalarmanlagen, Piezofolientastaturen und elektroakustischen Wandlern angewandt.The inner electrode can be formed as a wire or as a tube, for example an inner metallization of the piezoelectric hollow tube. The outer electrode consists either of a continuous metal layer or of a shielding braid that is customary for coaxial cables. Polyvinylidene fluoride (PVDF or PVF 2 ) is preferably used as the piezoelectric material, which is known to be characterized by a high degree of flexibility. Electronic monitoring circuits that respond to the output signals of piezoelectric sensors are known. They are used, for example, in hydrophones, burglar alarm systems, piezo film keyboards and electroacoustic transducers.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853525069 DE3525069A1 (en) | 1985-07-13 | 1985-07-13 | Elastic seal for housings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853525069 DE3525069A1 (en) | 1985-07-13 | 1985-07-13 | Elastic seal for housings |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3525069A1 true DE3525069A1 (en) | 1987-01-22 |
Family
ID=6275706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19853525069 Withdrawn DE3525069A1 (en) | 1985-07-13 | 1985-07-13 | Elastic seal for housings |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3525069A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4101871A1 (en) * | 1991-01-23 | 1992-07-30 | Univ Leipzig | Pressure sensing flat seal - comprises piezoelectric sensor sheet between electrically insulating vapour-proof protective ones |
-
1985
- 1985-07-13 DE DE19853525069 patent/DE3525069A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4101871A1 (en) * | 1991-01-23 | 1992-07-30 | Univ Leipzig | Pressure sensing flat seal - comprises piezoelectric sensor sheet between electrically insulating vapour-proof protective ones |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |