EP0595210B1 - Diaphragm assembly for a pressure switch - Google Patents
Diaphragm assembly for a pressure switch Download PDFInfo
- Publication number
- EP0595210B1 EP0595210B1 EP93117113A EP93117113A EP0595210B1 EP 0595210 B1 EP0595210 B1 EP 0595210B1 EP 93117113 A EP93117113 A EP 93117113A EP 93117113 A EP93117113 A EP 93117113A EP 0595210 B1 EP0595210 B1 EP 0595210B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diaphragm
- support plate
- edge
- membrane
- groove
- 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
- 239000011324 bead Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 2
- 238000007688 edging Methods 0.000 claims 1
- 210000004379 membrane Anatomy 0.000 description 79
- 239000012528 membrane Substances 0.000 description 75
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000013013 elastic material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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 a membrane arrangement according to the preamble of claim 1, to a method for producing the membrane arrangement and to an apparatus for performing the method.
- Pressure regulators and pressure switches for very small pressure differences in the fine pressure range generally require relatively large-area membranes with the lowest frictional resistance.
- Very thin membranes made of a highly elastic material are particularly suitable for this.
- the membrane in a ring shape so that it adjoins the membrane support plate radially without spanning the entire surface.
- ring-shaped membranes In contrast to full-area Membranes that require special care when handling and storing them prior to installation are ring-shaped membranes much less sensitive, so that they can be treated like bulk goods without damage. Such a simplification results in lower manufacturing costs.
- an annular membrane is attached to a membrane support plate in a radially arranged groove.
- the membrane support plate is molded onto the membrane.
- the cited document also describes a membrane arrangement in which the radially open groove of the membrane support plate for fastening the membrane is spread over the edge of the membrane.
- the invention has for its object to provide a membrane arrangement in which an annular membrane is mechanically attached to a membrane support plate without distortion and pressure-tight. Furthermore, a method for producing the membrane arrangement and a device which is advantageous for this purpose are to be specified.
- inventive solution according to claim 1 allows any materials for the membrane and the membrane support plate to be combined with one another, including those which are generally not suitable for being glued, welded or sprayed onto one another as plastics.
- the membrane for connection to the membrane support plate with its clamping bead arranged on the inner edge can be inserted without widening and therefore without distortion into the groove arranged on the outer edge of the membrane support plate.
- the membrane with its inner clamping bead can be reliably and pressure-tightly anchored in the groove of the membrane support plate without the clamping bead being deformed and the membrane being distorted, since the groove is only closed by the flanged edge, but not in its extent is changed.
- An embodiment according to claim 4 is used to give the diaphragm support plate the required stiffness with the lowest possible weight.
- the inventive method according to claim 5 is suitable for a membrane support plate made of plastic as well as for one made of metal, for example made of injection molding.
- a preferred embodiment of the method according to claim 6 is used for the rational connection of the membrane with a membrane support plate made of plastic. Like a membrane support plate made of metal, this is essentially a mechanical connection, during the production of which no solvent vapors are to be expected, as can occur when gluing and possibly also when one part is sprayed onto the other or during welding.
- Claims 7 to 10 describe a preferred embodiment of a device for connecting the membrane to a membrane support plate made of plastic.
- the membrane support plate 10 shown in FIG. 1 has a hub 12 and a tappet 14 in its center. Eight reinforcing ribs 16 extend radially from the hub 12 in a radial direction to a circular one Rib edge 18 . An annular membrane 22 is attached to the outer edge 20 of the membrane support plate 10 . This has on its outer edge an outer clamping bead 24 intended for clamping in a pressure switch or pressure sensor housing (not shown).
- the annular membrane 22 has a very thin-walled bead 26 which extends in the radial direction in an annular manner between the outer clamping bead 24 and an inner clamping bead 28 .
- the membrane support plate 10 has an axially directed annular groove 30 in its outer edge 20 , the diameter of which corresponds to that of the inner clamping bead 28 of the membrane 22 , so that the inner clamping bead 28 fits into the annular groove 30 .
- a likewise annular flanged edge 32 extends in the axial direction. This serves to close the annular groove 30 after the membrane 22 with its inner clamping bead 28 has been inserted into the annular groove 30 .
- the device shown in FIG. 4 serves to connect the membrane 22 to the membrane support plate 10 . It has a stationary die-like lower part 34 and a stamp-like upper part 36 which can be advanced in the axial direction onto the lower part 34 .
- the mutually facing end faces 38 , 40 of the lower part 34 and the upper part 36 are at least approximately adapted to the shape of the finished membrane arrangement 10 , 22 .
- the upper part 36 has on the end face 40 an annular flanging surface 42 which is intended for flanging and is directed obliquely outwards. This flanging surface 42 serves to deform the annular Flanged edge 32 of the membrane support plate 10 .
- FIG. 5 shows the edge region of the finished membrane arrangement 10, 22 in section.
- the flanged edge 32 (FIGS. 3 and 4) which extends in the axial direction before assembly is deformed in such a way that it now extends at least approximately radially outwards, as shown at 32 ′ .
- the membrane 22 with its inner clamping bead 28 is connected to the membrane support plate 10 in a pressure-tight and distortion-free manner, since the inner clamping bead 28 , like the rest of the membrane 22, is produced from a highly elastic material, such as, for example, from two-component liquid silicones.
- the membrane support plate 10 is preferably made of a plastic, such as a polycarbonate.
- openings 43 are arranged in the lower part 34 on the end face 38 , which are connected via channels 44 to a vacuum source of a known type, not shown.
- a vacuum source of a known type, not shown.
- the negative pressure acts on the bead 26 of the membrane 22 in order to reliably pull it with its inner clamping bead 28 into the annular groove 30 of the membrane support plate 10 .
- the upper part 36 is moved in the direction of the arrow 46 .
- the upper part 36 is excited in the axial direction by means of vibrations in the ultrasonic range.
- the flanging edge 32 is flanged through the flanging surface 42 .
- the frequency of the ultrasonic vibrations with which the sonotrode 48 serving as the upper part 36 is excited is generally 20 or 40 kHz. Under the effect of the vibrations, heat is generated in the part that is thus stressed, and thereby a melt flow that serves for deformation, in the present case for flanging.
- An ultrasound generator of a known type is used to generate the ultrasonic vibrations, the electrical output power of which is converted into mechanical vibrations by means of a converter, also not shown. These are transferred to the sonotrode 48 via a booster 50 .
- the booster 50 influences the amplitude in order to convert it to the value required on the sonotrode 48 .
- the invention ensures reliable anchoring of an annular membrane made of a highly elastic material on a membrane support plate.
- the invention is suitable for the pressure-tight connection of two different materials that cannot be glued or welded together.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
- Diaphragms And Bellows (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Description
Die Erfindung bezieht sich auf eine Membrananordnung nach dem Oberbegriff des Anspruchs 1, auf ein Verfahren zum Herstellen der Membrananordnung sowie auf eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a membrane arrangement according to the preamble of claim 1, to a method for producing the membrane arrangement and to an apparatus for performing the method.
Im Feinstdruckbereich werden beispielsweise bei Gas-heizkesseln zur Überwachung der Abgase Schaltgenauigkeiten von wenigen Pascal gefordert, die mit Druckschaltern der bekannten Bauart kaum mehr garantiert werden können. In der Regel handelt es sich dabei um Einstellungen von Arbeitsdrücken in der Grössenordnung von weniger als 200 Pa bzw. Druckdifferenzen von weniger als 20 Pa.In the ultra-fine pressure range, for example in gas boilers for monitoring the exhaust gases, switching accuracies of a few Pascals are required, which can no longer be guaranteed with pressure switches of the known type. As a rule, these are settings of working pressures of the order of less than 200 Pa or pressure differences of less than 20 Pa.
Druckregler und Druckschalter für sehr geringe Druckdifferenzen im Feinstdruckbereich benötigen in der Regel relativ grossflächige Membranen mit geringsten Reibungswiderständen. Dafür eignen sich insbesondere sehr dünne Membranen aus einem hochelastischen Werkstoff. Um die erforderliche Stabilität solcher Membranen zu gewährleisten und um die durch die Druckdifferenz aufgebrachte Kraft auf einen Schalt- oder Gebermechanismus zu übertragen, ist es allgemein bekannt, eine solche Membran mit einem aus einem relativ steifen Werkstoff bestehenden Membranstützteller abzustützen.Pressure regulators and pressure switches for very small pressure differences in the fine pressure range generally require relatively large-area membranes with the lowest frictional resistance. Very thin membranes made of a highly elastic material are particularly suitable for this. In order to ensure the required stability of such membranes and to transmit the force exerted by the pressure difference to a switching or transmitter mechanism, it is generally known to support such a membrane with a membrane support plate consisting of a relatively rigid material.
Um Werkstoff und Gewicht einzusparen, ist es vorteilhaft, die Membran ringförmig auszubilden, so dass sie sich radial an den Membranstützteller anschliesst, ohne die gesamte Fläche zu überspannen. Im Unterschied zu ganzflächigen Membranen, bei deren Handhabung und Lagerung vor dem Einbau besondere Sorgfalt erforderlich ist, sind ringförmige Membranen wesentlich unempfindlicher, so dass sie sich ohne Schaden wie Schüttgut behandeln lassen. Durch eine solche Vereinfachung ergeben sich niedrigere Herstellungskosten.In order to save material and weight, it is advantageous to design the membrane in a ring shape so that it adjoins the membrane support plate radially without spanning the entire surface. In contrast to full-area Membranes that require special care when handling and storing them prior to installation are ring-shaped membranes much less sensitive, so that they can be treated like bulk goods without damage. Such a simplification results in lower manufacturing costs.
Bei einer bekannten Anordnung nach der EP-A-0 507 002 ist eine ringförmige Membran an einem Membranstützteller in einer radial angeordneten Nut befestigt. Dabei ist der Membranstützteller an die Membran angespritzt. Ferner beschreibt die genannte Schrift auch eine Membrananordnung, bei welcher die radial offene Nut des Membranstütztellers zur Befestigung der Membran über der Rand der Membran gespreizt wird.In a known arrangement according to EP-A-0 507 002, an annular membrane is attached to a membrane support plate in a radially arranged groove. The membrane support plate is molded onto the membrane. Furthermore, the cited document also describes a membrane arrangement in which the radially open groove of the membrane support plate for fastening the membrane is spread over the edge of the membrane.
Der Erfindung liegt die Aufgabe zugrunde, eine Membrananordnung zu schaffen, bei der eine ringförmige Membran verzugsfrei und druckdicht mechanisch an einem Membranstützteller befestigt ist. Ferner sollen ein Verfahren zum Herstellen der Membrananordnung und eine dazu vorteilhafte Vorrichtung angegeben werden.The invention has for its object to provide a membrane arrangement in which an annular membrane is mechanically attached to a membrane support plate without distortion and pressure-tight. Furthermore, a method for producing the membrane arrangement and a device which is advantageous for this purpose are to be specified.
Die gestellte Aufgabe wird erfindungsgemäss durch die in den Ansprüchen 1, 5 und 7 angegebenen Merkmale gelöst.The object is achieved according to the invention by the features specified in claims 1, 5 and 7.
Durch die erfindungsgemässe Lösung nach Anspruch 1 lassen sich beliebige Werkstoffe für die Membran und den Membranstützteller miteinander kombinieren, auch solche, die in der Regel nicht dazu geeignet sind, geklebt, geschweisst oder als Kunststoffe aneinandergespritzt zu werden.The inventive solution according to claim 1 allows any materials for the membrane and the membrane support plate to be combined with one another, including those which are generally not suitable for being glued, welded or sprayed onto one another as plastics.
Im Gegensatz zu einer Anordnung mit einer ganzflächigen, auf einem Membranstützteller aufliegenden Membran ist eine Druckbeaufschlagung in beiden Richtungen möglich, ohne dass sich die Membran vom Membranstützteller abhebt. Die ringförmige Ausbildung erlaubt im Vergleich zu einer ganzflächigen Membran auch eine Einsparung an relativ kostspieligem Werkstoff, wie beispielsweise einem Siliconkautschuk. Zudem ermöglicht eine solche Anordnung eine sehr präzise Druckerfassung bei kleinsten Drücken in der Nähe des Nullpunktes.In contrast to an arrangement with a full-surface membrane resting on a membrane support plate, there is one Pressure can be applied in both directions without the membrane lifting off the membrane support plate. The ring-shaped design also allows a saving in relatively expensive material, such as a silicone rubber, in comparison to a full-area membrane. In addition, such an arrangement enables very precise pressure detection at the smallest pressures in the vicinity of the zero point.
Bei einer Ausführungsform nach Anspruch 2 ist gewährleistet, dass die Membran zum Verbinden mit dem Membranstützteller mit ihrem am inneren Rand angeordneten Einspannwulst ohne aufzuweiten und daher verzugsfrei in die am äusseren Rand des Membranstütztellers angeordnete Nut einlegbar ist.In one embodiment according to claim 2 it is ensured that the membrane for connection to the membrane support plate with its clamping bead arranged on the inner edge can be inserted without widening and therefore without distortion into the groove arranged on the outer edge of the membrane support plate.
Bei einer Ausführungsform nach Anspruch 3 lässt sich die Membran mit ihrem inneren Einspannwulst zuverlässig und druckdicht in der Nut des Membranstütztellers verankern, ohne dass der Einspannwulst dabei deformiert und die Membran verzogen wird, da die Nut durch den Bördelrand lediglich verschlossen, jedoch nicht in ihrer Ausdehnung verändert wird.In one embodiment according to claim 3, the membrane with its inner clamping bead can be reliably and pressure-tightly anchored in the groove of the membrane support plate without the clamping bead being deformed and the membrane being distorted, since the groove is only closed by the flanged edge, but not in its extent is changed.
Eine Ausführungsform nach Anspruch 4 dient dazu, dem Membranstützteller bei geringstmöglichem Gewicht die erforderliche Steifheit zu verleihen.An embodiment according to claim 4 is used to give the diaphragm support plate the required stiffness with the lowest possible weight.
Das erfindungsgemässe Verfahren nach Anspruch 5 ist sowohl für einen Membranstützteller aus Kunststoff wie auch für einen solchen aus Metall, beispielsweise aus Spritzguss, geeignet.The inventive method according to claim 5 is suitable for a membrane support plate made of plastic as well as for one made of metal, for example made of injection molding.
Eine bevorzugte Ausführungsform des Verfahrens nach Anspruch 6 dient zum rationellen Verbinden der Membran mit einem Membranstützteller aus Kunststoff. Dabei handelt es sich wie auch bei einem Membranstützteller aus Metall im wesentlichen um eine mechanische Verbindung, bei deren Herstellung keine Lösungsmitteldämpfe zu erwarten sind, wie sie beim Kleben und gegebenenfalls auch beim Anspritzen des einen Teils an das jeweils andere oder beim Verschweissen auftreten können.A preferred embodiment of the method according to claim 6 is used for the rational connection of the membrane with a membrane support plate made of plastic. Like a membrane support plate made of metal, this is essentially a mechanical connection, during the production of which no solvent vapors are to be expected, as can occur when gluing and possibly also when one part is sprayed onto the other or during welding.
Die Ansprüche 7 bis 10 beschreiben eine bevorzugte Ausführung einer Vorrichtung zum Verbinden der Membran mit einem Membranstützteller aus Kunststoff.Claims 7 to 10 describe a preferred embodiment of a device for connecting the membrane to a membrane support plate made of plastic.
Anhand der Zeichnungen wird ein Ausführungsbeispiel der Erfindung näher erläutert. Es zeigen:
- Fig. 1
- Eine Draufsicht auf einen Membranstützteller mit einer Membran,
- Fig. 2
- eine Schnittansicht der Membran,
- Fig. 3
- eine Schnittansicht des Membranstütztellers,
- Fig. 4
- eine Vorrichtung zum Verbinden der Membran mit einem Membranstützteller aus Kunststoff und
- Fig. 5
- eine Schnittansicht des Randbereiches einer an einem Membranstützteller befestigten Membran.
- Fig. 1
- A top view of a membrane support plate with a membrane,
- Fig. 2
- a sectional view of the membrane,
- Fig. 3
- 2 shows a sectional view of the membrane support plate,
- Fig. 4
- a device for connecting the membrane with a membrane support plate made of plastic and
- Fig. 5
- a sectional view of the edge region of a membrane attached to a membrane support plate.
Der in der Fig. 1 dargestellte Membranstützteller 10 weist in seinen Zentrum eine Nabe 12 und einen Stössel 14 auf. Von der Nabe 12 erstrecken sich acht Verstärkungsrippen 16 sternförmig in radialer Richtung bis zu einem kreisförmigen Rippenrand 18. Am äusseren Rand 20 des Membranstütztellers 10 ist eine ringförmige Membran 22 befestigt. Diese weist an ihrem äusseren Rand einen zum Einspannen in ein nicht dargestelltes Druckschalter- oder Druckgebergehäuse bestimmten äusseren Einspannwulst 24 auf.The
Gemäss Fig. 2 weist die ringförmige Membran 22 eine sehr dünnwandige Sicke 26 auf, die sich in radialer Richtung ringförmig zwischen dem äusseren Einspannwulst 24 und einem inneren Einspannwulst 28 erstreckt.2, the
Aus der Fig. 3 ist ersichtlich, dass der Membranstützteller 10 in seinem äusseren Rand 20 eine axial gerichtete Ringnut 30 aufweist, deren Durchmesser demjenigen des inneren Einspannwulstes 28 der Membran 22 entspricht, so dass der innere Einspannwulst 28 in die Ringnut 30 hineinpasst. Auf der Innenseite der Ringnut 30 erstreckt sich in axialer Richtung ein ebenfalls ringförmiger Bördelrand 32. Dieser dient zum Verschliessen der Ringnut 30, nachdem die Membran 22 mit ihrem inneren Einspannwulst 28 in die Ringnut 30 eingelegt worden ist.3 that the
Die in der Fig. 4 dargestellte Vorrichtung dient zum Verbinden der Membran 22 mit dem Membranstützteller 10. Sie weist ein ortsfestes matrizenartiges Unterteil 34 und ein in axialer Richtung auf das Unterteil 34 zustellbares stempelartiges Oberteil 36 auf. Die einander zugekehrten Stirnseiten 38, 40 des Unterteils 34 und des Oberteils 36 sind der Form der fertigen Membrananordnung 10, 22 mindestens annähernd angepasst. Das Oberteil 36 weist dazu auf der Stirnseite 40 eine ringförmige, zum Bördeln bestimmten, schräg nach aussen gerichtete Bördelfläche 42 auf. Diese Bördelfläche 42 dient zur Verformung des ringförmigen Bördelrandes 32 des Membranstütztellers 10.The device shown in FIG. 4 serves to connect the
In der Fig. 5 ist der Randbereich der fertigen Membrananordnung 10, 22 im Schnitt dargestellt. Dabei ist der sich vor der Montage in axialer Richtung erstreckende Bördelrand 32 (Figuren 3 und 4) derart verformt, dass er sich nun, wie bei 32' dargestellt, mindestens annähernd radial nach aussen erstreckt. Durch diese Verformung ist die Membran 22 mit ihrem inneren Einspannwulst 28 druckdicht und verzugsfrei mit dem Membranstützteller 10 verbunden, da der innere Einspannwulst 28 ebenso wie der übrige Teil der Membran 22 aus einem hochelastischen Werkstoff hergestellt wird, wie beispielsweise aus Zweikomponenten-Flüssigsiliconen. Der Membranstützteller 10 besteht vorzugsweise aus einem Kunststoff, wie z.B. einem Polycarbonat.5 shows the edge region of the finished
Gemäss Fig. 4 sind im Unterteil 34 an der Stirnseite 38 Öffnungen 43 angeordnet, die über Kanäle 44 mit einer nicht dargestellten Unterdruckquelle bekannter Bauart verbunden sind. Durch diese Öffnungen 43 wird die Membran 22 mittels Unterdruck festgehalten, nachdem zuvor der Membranstützteller 10 und anschliessend die Membran 22 auf das Unterteil 34 gelegt wurden. Der Unterdruck greift dabei an der Sicke 26 der Membran 22 an, um diese zuverlässig mit ihrem inneren Einspannwulst 28 in die Ringnut 30 des Membranstütztellers 10 hineinzuziehen.According to FIG. 4,
Nachdem der Membranstützteller 10 und die Membran 22 in die Vorrichtung eingelegt und die Unterdruckquelle eingeschaltet wurde, wird das Oberteil 36 in Pfeilrichtung 46 zugestellt. Bei einem vorbestimmten Anpressdruck wird das Oberteil 36 mittels Schwingungen im Ultraschallbereich in axialer Richtung erregt. Durch die Wirkung der Schwingungen bei dem vorbestimmten Anpressdruck wird der Bördelrand 32 durch die Bördelfläche 42 gebördelt.After the
Die Frequenz der Ultraschallschwingungen, mit der die als Oberteil 36 dienende Sonotrode 48 erregt wird, beträgt in der Regel 20 oder 40 kHz. Unter der Wirkung der Schwingungen entsteht in dem damit beanspruchten Teil Wärme und dadurch ein Schmelzfluss, der zur Verformung, im vorliegenden Fall zum Bördeln dient.The frequency of the ultrasonic vibrations with which the
Zum Erzeugen der Ultraschallschwingungen dient ein nicht dargestellter Ultraschallgenerator bekannter Bauart, dessen elektrische Ausgangsleistung mittels eines ebenfalls nicht dargestellten Konverters in mechanische Schwingungen umgesetzt wird. Diese werden über einen Booster 50 auf die Sonotrode 48 übertragen. Der Booster 50 beeinflusst die Amplitude, um diese auf den an der Sonotrode 48 benötigten Wert umzuformen.An ultrasound generator of a known type, not shown, is used to generate the ultrasonic vibrations, the electrical output power of which is converted into mechanical vibrations by means of a converter, also not shown. These are transferred to the
Durch die Erfindung ist eine zuverlässige Verankerung einer ringförmigen Membran aus einem hochelastischen Werkstoff an einem Membranstützteller gewährleistet. Insbesondere eignet sich die Erfindung zum druckdichten Verbinden von zwei unterschiedlichen Werkstoffen, die nicht miteinander verklebbar oder verschweissbar sind.The invention ensures reliable anchoring of an annular membrane made of a highly elastic material on a membrane support plate. In particular, the invention is suitable for the pressure-tight connection of two different materials that cannot be glued or welded together.
Claims (10)
- A diaphragm arrangement for a pressure switch or a transmitter responding to pressure, consisting of an annular diaphragm (22) fixed on a diaphragm support plate (10) and the inner edge (28) of which engages a groove (30) on the outer edge (20) of the diaphragm support plate (10), characterised in that the diaphragm (22) is fixed in the groove (30) in the diaphragm support plate (10) in pressure-tight and distortion-free manner, being fixed by a rolled edge (32).
- A diaphragm arrangement according to Claim 1, characterised in that the groove (30) at the outer edge (20) of the diaphragm support plate (10) is an axially directed annular groove into which a clamping bead (28) disposed on the inner edge of the diaphragm (22) engages.
- A diaphragm arrangement according to Claim 2, characterised in that the diaphragm support plate (10) has on the side of the annular groove (30) which is towards its centre a rolled edge (32') which is rolled radially outwards and which at least approximately occludes the groove, the inner clamping bead (28) of the diaphragm (22) being clamped in the annular groove (30) by the said edge (32').
- A diaphragm arrangement according to one of the preceding Claims, characterised in that the diaphragm support plate (10) which comprises a hub (12) or a push member (14) consists of a material of minimal thickness and which comprises reinforcing ribs (16) extending radially outwards from the hub (12) or push member (14).
- A method of producing the diaphragm arrangement according to one of the preceding Claims, whereby the diaphragm (22) has its inner edge (28) inserted in distortion-free manner into the groove (30) in the diaphragm support plate (10), being fixed by a flanging over of a rolled edge (32) disposed on the diaphragm support plate (10).
- A method according to Claim 5 for connecting the diaphragm to the diaphragm support plate according to Claim 3, characterised in that the diaphragm (22) has its inner clamping bead (28) inserted into the annular groove (30) in a diaphragm support plate (10) which consists of a synthetic plastics material, the rolled edge (32) of the diaphragm support plate (10) which extends in an axial direction prior to the connection being made is rolled over radially outwards by ultrasound.
- An apparatus for carrying out the method according to Claim 5 or 6, with a bottom part (34) like a bottom die and an upper part (36) like an upper die, of which the mutually facing sides (38, 40) are adapted to the shape of the diaphragm (22) with support plate (10) and which are adapted to be moved towards and in relation to each other, and of which one of the two parts (34, 36) can be energised by oscillations in the ultrasonic range.
- An apparatus according to Claim 7, characterised in that the upper part (36) is coupled to a booster (50) of an ultrasonic generator and has on its end face (40) an annular obliquely outwardly directed edging surface (42) for flanging the rolled-over edge (32) of the diaphragm support plate (10).
- An apparatus according to Claim 7 or 8, characterised in that the upper part (36) is disposed to be moved in an axial direction towards the bottom part (34) and can be energised by ultrasound and in that the direction of the ultrasonic oscillations is axial.
- An apparatus according to one of Claims 7 to 9, characterised in that the bottom part (34) has on its end face (38) apertures (43) connected to a source of negative pressure for attracting by suction and then gripping the diaphragm (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH338792 | 1992-10-30 | ||
| CH3387/92 | 1992-10-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0595210A1 EP0595210A1 (en) | 1994-05-04 |
| EP0595210B1 true EP0595210B1 (en) | 1997-03-26 |
Family
ID=4254872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93117113A Expired - Lifetime EP0595210B1 (en) | 1992-10-30 | 1993-10-22 | Diaphragm assembly for a pressure switch |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5421242A (en) |
| EP (1) | EP0595210B1 (en) |
| CA (1) | CA2109472C (en) |
| DE (1) | DE59305946D1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6040536A (en) * | 1998-01-26 | 2000-03-21 | Miller Edge, Inc. | Pressure responsive switch and method of making same |
| US6378414B1 (en) | 1999-06-28 | 2002-04-30 | Tse Brakes, Inc. | Removable filter cap for spring brake actuator |
| EP2383004A1 (en) * | 2010-04-30 | 2011-11-02 | Fresenius Medical Care Deutschland GmbH | Membrane for a pressure dome |
| CH705065B1 (en) * | 2011-06-01 | 2014-12-15 | Huba Control Ag | Differential pressure switch. |
| CN105093101B (en) * | 2015-06-26 | 2018-11-23 | 威能(无锡)供热设备有限公司 | Blast switch test equipment |
| US10422331B2 (en) * | 2016-08-12 | 2019-09-24 | Ingersoll-Rand Company | One piece diaphragm |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT86261B (en) * | 1919-02-03 | 1921-11-10 | Alfred Ing Scheuer | Brake cylinder. |
| US3168855A (en) * | 1957-09-19 | 1965-02-09 | Glenn T Randol | Detachable mounting means for flexible power-diaphragms |
| US3212446A (en) * | 1962-10-18 | 1965-10-19 | Robertshaw Controls Co | Fluid pump or the like and method for making the same |
| EP0017453A1 (en) * | 1979-04-02 | 1980-10-15 | Eaton Corporation | Washing appliance and liquid level sensing means therefor |
| CH667736A5 (en) * | 1984-10-15 | 1988-10-31 | Huba Control Ag | SENSOR ADDRESSING AT PRESSURE. |
| JPS6323744U (en) * | 1986-07-29 | 1988-02-17 | ||
| JP2520963Y2 (en) * | 1990-10-31 | 1996-12-18 | 矢崎総業株式会社 | pressure switch |
| US5249508A (en) * | 1991-03-22 | 1993-10-05 | Jidosha Denki Kogyo Kabushiki Kaisha | Actuator of diaphragm type |
| EP0507002A3 (en) * | 1991-04-02 | 1992-12-09 | Huba Control Ag | Pressure switch |
-
1993
- 1993-10-22 DE DE59305946T patent/DE59305946D1/en not_active Expired - Fee Related
- 1993-10-22 EP EP93117113A patent/EP0595210B1/en not_active Expired - Lifetime
- 1993-10-28 CA CA002109472A patent/CA2109472C/en not_active Expired - Fee Related
- 1993-10-29 US US08/143,116 patent/US5421242A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0595210A1 (en) | 1994-05-04 |
| US5421242A (en) | 1995-06-06 |
| CA2109472C (en) | 1996-10-08 |
| CA2109472A1 (en) | 1994-05-01 |
| DE59305946D1 (en) | 1997-04-30 |
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