EP1643520B1 - Pressure switch with protection against membrane overexpansion - Google Patents
Pressure switch with protection against membrane overexpansion Download PDFInfo
- Publication number
- EP1643520B1 EP1643520B1 EP05018612A EP05018612A EP1643520B1 EP 1643520 B1 EP1643520 B1 EP 1643520B1 EP 05018612 A EP05018612 A EP 05018612A EP 05018612 A EP05018612 A EP 05018612A EP 1643520 B1 EP1643520 B1 EP 1643520B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- pressure
- pressure switch
- housing
- max
- 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 - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2685—Means to protect pressure sensitive element against over pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
Definitions
- the invention relates to the field of pressure switches for pressures up to a maximum allowable pressure.
- a pressure acts on a membrane.
- the membrane undergoes a deflection and is thereby stretched.
- This deflection corresponds to a stroke, e.g. can be transmitted via a plunger to an electrical contact system.
- the deflection of the membrane under pressure must be limited by a stop, as this can be overstretched at too high pressure. Usually prevents a mechanical stop this overstretching.
- a corresponding stop must be very accurate. Conventionally, these stops are made by machining or pressing machining. They are therefore always subject to manufacturing tolerances, which means that either the maximum allowable stroke of the membrane is not utilized or exceeded. Exceeding the maximum allowable stroke may damage the diaphragm.
- a method is to be provided, with which a pressure switch can be produced, which has a mechanical stop for the membrane, against which the membrane rests when exposed to the maximum permissible pressure over the entire surface.
- the pressure switch according to the invention for pressures up to a maximum allowable pressure p max has a housing and a membrane, wherein the membrane is mounted in the housing.
- the membrane has a side on which a pressure can act and is deflected when pressure is applied to it.
- the membrane is secured in the housing so that the deflection of the membrane leads to an expansion.
- the pressure switch further comprises a device that converts the membrane deflection into a stroke, and an electrical contact system that cooperates with the device.
- the device causes a diaphragm deflection to result in actuation of the electrical contact system.
- the pressure switch further comprises a cast stop, which completely fills a cavity between an inner wall of the housing and the side of the membrane facing away from the pressure, when the membrane is subjected to the maximum permissible pressure p max .
- the invention also provides a method of manufacturing a pressure switch for pressures up to a maximum allowable pressure p max .
- the method comprises the steps of: attaching a membrane in a housing, the membrane having a side on which a pressure p can act; Pressurizing the diaphragm with the maximum permissible pressure p max , whereby the membrane is bent; Filling a cavity, which forms between a housing inner wall and a side of the membrane, which faces away from the pressure, with a liquid potting compound, while the maximum allowable pressure p max is maintained.
- the hardening of the potting compound results in the cast stop, which completely fills the cavity.
- casting compounds for example, polyurethane or epoxy resins can be used.
- the curing can be through Heat supply (eg inductive) to be accelerated. Another way to accelerate curing is by exposure to light.
- the unavoidable in machining or pressing processing manufacturing tolerances eliminated.
- the stop is individually adapted to the membrane and thus can compensate for manufacturing tolerances of the membrane. The membrane is fully exposed to the stop when exposed to the maximum permissible pressure p max . This can not lead to a local overstretching.
- the device for transmitting the membrane deflection is a plunger which is guided by the housing.
- the membrane is made of metal.
- the stop consists of a hardened potting compound.
- FIG. 1 shows a section of a section of a pressure switch in conventional technology with its essential parts.
- a membrane 2 is fixed, which is shown in a state in which no pressure is applied to the membrane.
- the housing inner wall is machined so that stop surfaces 3 are formed to prevent overstretching of the membrane 2.
- a plunger 4 is used to implement the membrane bend in a hub, which is forwarded to an unillustrated electrical contact system.
- Figure 2 shows the same pressure switch upon application of a pressure p, which is smaller than the maximum allowable pressure P max . Due to the manufacturing tolerances in the production of the abutment surfaces 3, the membrane 2 is already in some places at the stop, although the maximum allowable pressure p max has not yet been reached. The position of the membrane 2 in the unpressurized state is indicated by dashed lines. Tappet 4 is deflected by a stroke s.
- the sectional view in FIG. 3 shows a corresponding pressure switch in which, due to manufacturing tolerances, the membrane 2 does not touch the stop surfaces 3 or at least not completely, although pressure p has already reached or even exceeded the maximum permissible pressure p max .
- the maximum possible stroke s is undershot by a distance ⁇ s. The possible hub is therefore not fully utilized.
- the membrane can be overstretched.
- FIG. 4 shows a section of a pressure switch according to the invention during the manufacturing process.
- a housing 1 has a uniform wall thickness, there is no stop surface incorporated.
- a membrane 2 is is clamped with its peripheral edge on the housing 1 and is subjected to a maximum allowable pressure p max .
- the membrane 2 is therefore in the maximum permissible stretched state.
- a plunger 4 is deflected by the maximum stroke s.
- a cavity is formed. This cavity is now filled through an opening 7 of the housing 1 with a liquid potting compound to pour a stopper 5 with an optimally adapted stop surface 6 ( Figure 5).
- the sealing compound is cured. This process can be accelerated by inductive heat. Depending on the material used, an acceleration by light is possible. After curing of the potting compound, the pressure p max can be removed.
- Figure 5 shows the pressure switch according to the invention after curing of the sealing compound.
- Diaphragm 2 is in unloaded condition, there is no pressure on the pressure switch.
- Tappet 4 is not deflected.
- the cured potting compound such as a polyurethane resin or an epoxy resin, forms a stop 5, which occupies the cavity of Figure 4 completely.
- Stop 5 has a stop surface 6, against which the membrane 2 is applied over the entire surface when acted upon by the maximum pressure p max . With the stop 5 ensures that the membrane 2 is not overstretched, but the maximum possible stroke s is utilized.
Description
Die Erfindung betrifft das Gebiet der Druckschalter für Drücke bis zu einem maximal zulässigen Druck.The invention relates to the field of pressure switches for pressures up to a maximum allowable pressure.
Bei bekannten Druckschaltern wirkt ein Druck auf eine Membran. Infolge dieses Druckes erfährt die Membran eine Durchbiegung und wird dadurch gedehnt. Diese Durchbiegung entspricht einem Hub, der z.B. über einen Stößel auf ein elektrisches Kontaktsystem übertragen werden kann. Die Durchbiegung der Membran unter Druck muß durch einen Anschlag begrenzt werden, da diese sonst bei zu hohem Druck überdehnt werden kann. Üblicherweise verhindert ein mechanischer Anschlag diese Überdehnung. Speziell bei Membranen aus Metall, die nur wenig gedehnt werden können, muß ein entsprechender Anschlag sehr genau sein. Herkömmlicherweise werden diese Anschläge durch spanende oder pressende Bearbeitung hergestellt. Sie unterliegen damit immer Fertigungstoleranzen, was bedeutet, daß entweder der maximal zulässige Hub der Membran nicht ausgenützt oder aber überschritten wird. Bei Überschreitung des maximal zulässigen Hubs kann die Membran beschädigt werden.In known pressure switches, a pressure acts on a membrane. As a result of this pressure, the membrane undergoes a deflection and is thereby stretched. This deflection corresponds to a stroke, e.g. can be transmitted via a plunger to an electrical contact system. The deflection of the membrane under pressure must be limited by a stop, as this can be overstretched at too high pressure. Usually prevents a mechanical stop this overstretching. Especially with membranes made of metal, which can be stretched only slightly, a corresponding stop must be very accurate. Conventionally, these stops are made by machining or pressing machining. They are therefore always subject to manufacturing tolerances, which means that either the maximum allowable stroke of the membrane is not utilized or exceeded. Exceeding the maximum allowable stroke may damage the diaphragm.
Ein Beispiel von Druckschalter mit mechanischer Anschlag wird in
Es soll ein Druckschalter geschaffen werden, mit einem mechanischen Anschlag für die Membran, an dem die Membran bei Beaufschlagung mit dem maximal zulässigen Druck vollflächig anliegt.It should be created a pressure switch, with a mechanical stop for the membrane to which the membrane is fully applied when exposed to the maximum allowable pressure.
Ferner soll ein Verfahren bereitgestellt werden, mit dem ein Druckschalter hergestellt werden kann, der einen mechanischen Anschlag für die Membran aufweist, an dem die Membran bei Beaufschlagung mit dem maximal zulässigen Druck vollflächig anliegt.Furthermore, a method is to be provided, with which a pressure switch can be produced, which has a mechanical stop for the membrane, against which the membrane rests when exposed to the maximum permissible pressure over the entire surface.
Der erfindungsgemäße Druckschalter für Drücke bis zu einem maximal zulässigen Druck pmax weist ein Gehäuse und eine Membran auf, wobei die Membran im Gehäuse befestigt ist. Die Membran weist eine Seite auf, auf die ein Druck einwirken kann und wird durchgebogen, wenn ein Druck auf sie einwirkt. Die Membran ist dabei so im Gehäuse befestigt, daß die Durchbiegung der Membran zu einer Ausdehnung führt. Der Druckschalter umfaßt weiterhin eine Vorrichtung, die die Membrandurchbiegung in einen Hub umsetzt, sowie ein elektrisches Kontaktsystem, das mit der Vorrichtung zusammenwirkt. Die Vorrichtung bewirkt, daß eine Membrandurchbiegung zu einer Betätigung des elektrischen Kontaktsystems führt. Der Druckschalter umfaßt weiterhin einen gegossenen Anschlag, der einen Hohlraum zwischen einer Innenwand des Gehäuses und der dem Druck abgewandten Seite der Membran vollständig ausfüllt, wenn die Membran mit dem maximal zulässigen Druck pmax beaufschlagt ist.The pressure switch according to the invention for pressures up to a maximum allowable pressure p max has a housing and a membrane, wherein the membrane is mounted in the housing. The membrane has a side on which a pressure can act and is deflected when pressure is applied to it. The membrane is secured in the housing so that the deflection of the membrane leads to an expansion. The pressure switch further comprises a device that converts the membrane deflection into a stroke, and an electrical contact system that cooperates with the device. The device causes a diaphragm deflection to result in actuation of the electrical contact system. The pressure switch further comprises a cast stop, which completely fills a cavity between an inner wall of the housing and the side of the membrane facing away from the pressure, when the membrane is subjected to the maximum permissible pressure p max .
Die Erfindung stellt auch ein Verfahren bereit zur Herstellung eines Druckschalters für Drücke bis zu einem maximal zulässigen Druck pmax. Das Verfahren umfaßt folgende Schritte: Befestigen einer Membran in einem Gehäuse, wobei die Membran eine Seite aufweist, auf die ein Druck p einwirken kann; Beaufschlagen der Membran mit dem maximal zulässigen Druck pmax, wodurch die Membran durchgebogen wird; Ausfüllen eines Hohlraums, der sich zwischen einer Gehäuseinnenwand und einer Seite der Membran bildet, die dem Druck abgewandt ist, mit einer flüssigen Vergußmasse, während der maximal zulässige Druck pmax aufrecht erhalten wird.The invention also provides a method of manufacturing a pressure switch for pressures up to a maximum allowable pressure p max . The method comprises the steps of: attaching a membrane in a housing, the membrane having a side on which a pressure p can act; Pressurizing the diaphragm with the maximum permissible pressure p max , whereby the membrane is bent; Filling a cavity, which forms between a housing inner wall and a side of the membrane, which faces away from the pressure, with a liquid potting compound, while the maximum allowable pressure p max is maintained.
Durch das Aushärten der Vergußmasse entsteht der gegossene Anschlag, der den Hohlraum vollständig ausfüllt. Als Vergußmassen können beispielsweise Polyurethan- oder Epoxidharze Verwendung finden. Das Aushärten kann durch Wärmezufuhr (z.B. induktiv) beschleunigt werden. Eine andere Möglichkeit, die Aushärtung zu beschleunigen, ist durch Lichteinwirkung gegeben. Die bei spanender oder pressender Bearbeitung unvermeidlichen Fertigungstoleranzen entfallen. Der Anschlag ist jeweils individuell an die Membran angepaßt und kann somit auch Fertigungstoleranzen der Membran ausgleichen. Die Membran liegt bei Einwirken des maximal zulässigen Drucks pmax vollflächig am Anschlag an. Damit kann es nicht zu einer lokalen Überdehnung kommen.The hardening of the potting compound results in the cast stop, which completely fills the cavity. As casting compounds, for example, polyurethane or epoxy resins can be used. The curing can be through Heat supply (eg inductive) to be accelerated. Another way to accelerate curing is by exposure to light. The unavoidable in machining or pressing processing manufacturing tolerances eliminated. The stop is individually adapted to the membrane and thus can compensate for manufacturing tolerances of the membrane. The membrane is fully exposed to the stop when exposed to the maximum permissible pressure p max . This can not lead to a local overstretching.
Vorzugsweise handelt es sich bei der Vorrichtung zur Übertragung der-Membrandurchbiegung um einen Stößel, der vom Gehäuse geführt wird.Preferably, the device for transmitting the membrane deflection is a plunger which is guided by the housing.
In einer bevorzugten Ausführungsform besteht die Membran aus Metall.In a preferred embodiment, the membrane is made of metal.
In einer weiteren bevorzugten Ausführungsform besteht der Anschlag aus einer gehärteten Vergußmasse.In a further preferred embodiment, the stop consists of a hardened potting compound.
Vorzüge und Besonderheiten der Erfindung werden anhand der nachstehenden Erläuterungen ersichtlich, die auf die Zeichnung Bezug nehmen. Darin ist
- Figur 1 eine Schnittdarstellung eines Druckschalters nach dem Stand der Technik mit einer Membran im nicht-ausgedehnten Zustand;
Figur 2 eine Schnittdarstellung eines Druckschalters nach dem Stand der Technik mit einer Membran, die mit einem Druck kleiner dem maximal zulässigen Druck beaufschlagt ist;Figur 3 eine Schnittdarstellung eines Druckschalters nach dem Stand der Technik, wobei die Membran mit einem Druck größer dem maximal zulässigen Druck beaufschlagt ist;- Figur 4 eine Schnittdarstellung eines erfindungsgemäßen Druckschalters, bei dem die Membran mit dem maximal zulässigen Druck pmax beaufschlagt ist; und
Figur 5 eine Schnittdarstellung durch einen erfindungsgemäßen Druckschalter, bei dem die Membran unbelastet ist.
- Figure 1 is a sectional view of a pressure switch according to the prior art with a membrane in the unexpanded state;
- Figure 2 is a sectional view of a pressure switch according to the prior art with a membrane which is acted upon by a pressure less than the maximum allowable pressure;
- Figure 3 is a sectional view of a pressure switch according to the prior art, wherein the membrane is acted upon by a pressure greater than the maximum allowable pressure;
- Figure 4 is a sectional view of a pressure switch according to the invention, in which the membrane is acted upon by the maximum allowable pressure p max ; and
- Figure 5 is a sectional view through a pressure switch according to the invention, in which the membrane is unloaded.
Figur 1 zeigt in einer Schnittdarstellung einen Ausschnitt aus einem Druckschalter in herkömmlicher Technik mit seinen wesentlichen Teilen. In einem Gehäuse 1 ist eine Membran 2 befestigt, die in einem Zustand gezeigt wird, in dem kein Druck auf die Membran einwirkt. Die Gehäuseinnenwand ist so bearbeitet, daß Anschlagsflächen 3 entstehen, die eine Überdehnung der Membran 2 verhindern sollen. Ein Stößel 4 dient zur Umsetzung der Membrandurchbiegung in einen Hub, der an ein nicht dargestelltes elektrisches Kontaktsystem weitergeleitet wird.Figure 1 shows a section of a section of a pressure switch in conventional technology with its essential parts. In a housing 1, a
Figur 2 zeigt den gleichen Druckschalter bei Beaufschlagung mit einem Druck p, der kleiner ist als der maximal zulässige Druck Pmax. Aufgrund der Fertigungstoleranzen bei der Herstellung der Anschlagflächen 3 liegt die Membran 2 bereits an einigen Stellen am Anschlag an, obwohl der maximal zulässige Druck pmax noch nicht erreicht ist. Die Lage der Membran 2 im drucklosen Zustand ist gestrichelt angedeutet. Stößel 4 ist um einen Hub s ausgelenkt.Figure 2 shows the same pressure switch upon application of a pressure p, which is smaller than the maximum allowable pressure P max . Due to the manufacturing tolerances in the production of the
Die Schnittdarstellung in Figur 3 zeigt einen entsprechenden Druckschalter, bei dem bedingt durch Fertigungstoleranzen die Membran 2 die Anschlagsflächen 3 noch nicht oder zumindest nicht vollflächig berührt, obwohl Druck p bereits den maximal zulässigen Druck pmax erreicht oder sogar überschritten hat. Der maximal mögliche Hub s wird um eine Strecke Δs unterschritten. Der mögliche Hub wird also nicht vollständig ausgenutzt. Die Membran kann überdehnt werden.The sectional view in FIG. 3 shows a corresponding pressure switch in which, due to manufacturing tolerances, the
Um die mit den Fertigungstoleranzen einhergehenden Probleme zu lösen, wird bei dem erfindungsgemäßem Druckschalter ein anderer Weg zur Herstellung eines Anschlags beschritten.In order to solve the problems associated with the manufacturing tolerances, another way of producing a stop is taken in the pressure switch according to the invention.
Figur 4 zeigt einen Ausschnitt aus einem erfindungsgemäßen Druckschalter während des Herstellungsprozesses. Ein Gehäuse 1 weist eine gleichmäßige Wandstärke auf, es ist keine Anschlagsfläche eingearbeitet. Eine Membran 2 ist mit ihrem Umfangsrand am Gehäuse 1 eingespannt und wird mit einem maximal zulässigen Druck pmax beaufschlagt. Die Membran 2 befindet sich daher im maximal zulässigen gedehnten Zustand. Ein Stößel 4 ist um den maximalen Hub s ausgelenkt. Zwischen Gehäuseinnenwand und Membran ist ein Hohlraum gebildet. Dieser Hohlraum wird jetzt durch eine Öffnung 7 des Gehäuses 1 mit einer flüssigen Vergußmasse ausgefüllt, um einen Anschlag 5 mit einer optimal angepaßten Anschlagsfläche 6 (Figur 5) zu gießen. Anschließend wird die Vergußmasse ausgehärtet. Dieser Vorgang kann durch induktive Wärmezufuhr beschleunigt werden. Je nach verwendetem Material ist auch eine Beschleunigung durch Lichtzufuhr möglich. Nach dem Aushärten der Vergußmasse kann der Druck pmax weggenommen werden.Figure 4 shows a section of a pressure switch according to the invention during the manufacturing process. A housing 1 has a uniform wall thickness, there is no stop surface incorporated. A
Figur 5 zeigt den erfindungsgemäßen Druckschalter nach Aushärten der Vergußmasse. Membran 2 ist im unbelasteten Zustand, es wirkt kein Druck auf den Druckschalter. Stößel 4 ist nicht ausgelenkt. Die ausgehärtete Vergußmasse, beispielsweise ein Polyurethanharz oder ein Epoxidharz, bildet einen Anschlag 5, der den Hohlraum aus Figur 4 vollständig einnimmt. Anschlag 5 hat eine Anschlagsfläche 6, an der die Membran 2 bei Beaufschlagung mit dem maximalen Druck pmax ganzflächig anliegt. Mit dem Anschlag 5 ist gewährleistet, daß die Membran 2 nicht überdehnt wird, aber der maximal mögliche Hub s ausgenutzt wird.Figure 5 shows the pressure switch according to the invention after curing of the sealing compound.
Claims (6)
- A pressure switch for pressures up to a maximum permissible pressure (pmax), comprising the following:- a housing (1);- a membrane (2) that is fastened in the housing (1) and that has a face on which a pressure p can act, the membrane (2) being bent when pressure p acts on it;- a device (4) that converts the bending movement of the membrane into a stroke;- an electric contact system that interacts with the device (4),characterized in that the pressure switch also comprises the following:- a cast stop (5) that completely fills a cavity between an inner wall of the housing and the face of the membrane (2) facing away from the pressure p when the membrane (2) is exposed to the maximum permissible pressure (pmax).
- The pressure switch according to claim 1, in which the device for converting the bending movement of the membrane into a stroke is a plunger that is guided by the housing.
- The pressure switch according to either of the preceding claims, in which the membrane is made of metal.
- The pressure switch according to any of the preceding claims, in which the cast stop is made of hardened casting compound.
- The pressure switch according to claim 4, in which the casting compound is a polyurethane resin or an epoxy resin.
- A method of producing a pressure switch for pressures up to a maximum permissible pressure (pmax) according to claim 1, comprising the following steps:- fastening a membrane (2) in a housing (1), the membrane (2) having a face on which a pressure p can act;- exposing the membrane (2) to the maximum permissible pressure (pmax), as a result of which the membrane (2) is bent;- filling a cavity (3) that forms between an inner wall of the housing and a face of the membrane (2) facing away from the pressure with a liquid casting compound while the maximum permissible pressure (pmax) is maintained;- curing the casting compound.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004047293A DE102004047293A1 (en) | 2004-09-29 | 2004-09-29 | Pressure switch with membrane protection against overstretching |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1643520A1 EP1643520A1 (en) | 2006-04-05 |
| EP1643520B1 true EP1643520B1 (en) | 2007-09-19 |
Family
ID=35241350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05018612A Expired - Fee Related EP1643520B1 (en) | 2004-09-29 | 2005-08-26 | Pressure switch with protection against membrane overexpansion |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7157654B2 (en) |
| EP (1) | EP1643520B1 (en) |
| JP (1) | JP4084815B2 (en) |
| KR (1) | KR100736644B1 (en) |
| CN (1) | CN100399485C (en) |
| BR (1) | BRPI0504086A (en) |
| DE (2) | DE102004047293A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004047293A1 (en) | 2004-09-29 | 2006-04-13 | Trw Automotive Electronics & Components Gmbh & Co. Kg | Pressure switch with membrane protection against overstretching |
| JP2016091887A (en) | 2014-11-07 | 2016-05-23 | 株式会社鷺宮製作所 | Method of manufacturing diaphragm with contact, and pressure switch including diaphragm with contact manufactured by the method |
| CN105527052A (en) * | 2016-01-14 | 2016-04-27 | 湖北江汉石油仪器仪表股份有限公司 | Rubber cup protection structure of rubber-cup-type stand pipe pressure sensor |
| CN108305814B (en) * | 2018-02-27 | 2024-04-16 | 四川新川航空仪器有限责任公司 | Pressure signal device capable of bearing ultrahigh overload for long time |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD5975A (en) * | ||||
| DE5975C (en) | A. WEBER & F. ORTMANN in Grumme bei Bochum | Fall platform for shaft brake mountains with medium-sized sections at the bottom | ||
| GB1077825A (en) * | 1963-10-18 | 1967-08-02 | Texas Instruments Inc | Fluid pressure-responsive devices |
| US4145588A (en) * | 1977-09-29 | 1979-03-20 | Texas Instruments Incorporated | Condition responsive apparatus having freely disposed disc |
| GB2005474B (en) * | 1977-09-29 | 1982-04-07 | Texas Instruments Inc | Condition responsive devices |
| DE2750419C3 (en) * | 1977-11-11 | 1981-11-26 | Fa. Leopold Kostal, 5880 Lüdenscheid | Pressure medium-operated electrical miniature switch |
| JPS5982936U (en) | 1982-11-26 | 1984-06-05 | 株式会社テージーケー | 3-action pressure switch |
| US4591677A (en) | 1985-02-07 | 1986-05-27 | Tgk Company, Limited | Three-function pressure switch |
| DE3541298C1 (en) * | 1985-11-22 | 1987-04-02 | Rudolf Barger Gmbh | Pneumatically controllable electrical switch |
| DE3935298A1 (en) * | 1989-10-24 | 1991-04-25 | Bosch Gmbh Robert | Vehicle tyre pressure sensor - has membrane switch actuator with liq.-filled bellows with increasing pressure threshold with speed |
| US5149927A (en) | 1991-04-05 | 1992-09-22 | Eaton Corporation | Binary action pressure switch |
| US5296659A (en) * | 1993-01-19 | 1994-03-22 | Viz Manufacturing Company, Inc. | Differential pressure monitoring device |
| CN2283304Y (en) * | 1996-08-23 | 1998-06-03 | 代子猷 | Fluid pressure-sensitive switch |
| CN1307349A (en) * | 2000-01-27 | 2001-08-08 | 株式会社不二工机 | Pressure switch |
| US6410870B1 (en) * | 2000-03-24 | 2002-06-25 | Tecmark Corporation | Pneumatic actuated switch |
| US6255609B1 (en) * | 2000-06-26 | 2001-07-03 | Predator Systems, Inc. | High pressure resistant, low pressure actuating sensors |
| DE102004047293A1 (en) | 2004-09-29 | 2006-04-13 | Trw Automotive Electronics & Components Gmbh & Co. Kg | Pressure switch with membrane protection against overstretching |
| US9499627B2 (en) * | 2009-08-03 | 2016-11-22 | University Of Miami | Method for in vivo expansion of T regulatory cells |
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2004
- 2004-09-29 DE DE102004047293A patent/DE102004047293A1/en not_active Withdrawn
-
2005
- 2005-08-26 EP EP05018612A patent/EP1643520B1/en not_active Expired - Fee Related
- 2005-08-26 DE DE502005001522T patent/DE502005001522D1/en active Active
- 2005-09-13 CN CNB2005100999331A patent/CN100399485C/en not_active Expired - Fee Related
- 2005-09-13 JP JP2005265148A patent/JP4084815B2/en not_active Expired - Fee Related
- 2005-09-21 BR BRPI0504086-8A patent/BRPI0504086A/en not_active IP Right Cessation
- 2005-09-28 KR KR1020050090790A patent/KR100736644B1/en not_active IP Right Cessation
- 2005-09-29 US US11/238,546 patent/US7157654B2/en active Active
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|---|---|
| CN100399485C (en) | 2008-07-02 |
| DE502005001522D1 (en) | 2007-10-31 |
| JP4084815B2 (en) | 2008-04-30 |
| EP1643520A1 (en) | 2006-04-05 |
| US20060065513A1 (en) | 2006-03-30 |
| KR100736644B1 (en) | 2007-07-09 |
| CN1755858A (en) | 2006-04-05 |
| BRPI0504086A (en) | 2007-09-25 |
| JP2006100270A (en) | 2006-04-13 |
| US7157654B2 (en) | 2007-01-02 |
| KR20060051778A (en) | 2006-05-19 |
| DE102004047293A1 (en) | 2006-04-13 |
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