EP1137029A2 - Anordnung zum berührungslosen Schalten eines elektrischen Kontaktes und Druckmessgerät - Google Patents
Anordnung zum berührungslosen Schalten eines elektrischen Kontaktes und Druckmessgerät Download PDFInfo
- Publication number
- EP1137029A2 EP1137029A2 EP01106862A EP01106862A EP1137029A2 EP 1137029 A2 EP1137029 A2 EP 1137029A2 EP 01106862 A EP01106862 A EP 01106862A EP 01106862 A EP01106862 A EP 01106862A EP 1137029 A2 EP1137029 A2 EP 1137029A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- leaf spring
- switching
- arrangement according
- clamping point
- free end
- 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.)
- Granted
Links
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
- H01H35/26—Details
- H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
- H01H35/2635—Means for adjustment of "ON" or "OFF" operating pressure by adjustment of a motion transmitting system
-
- 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
- H01H35/247—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow the switch being of the reed switch type
Definitions
- the pressure cells can also be designed as differential pressure cells two pressurized media e.g. Gases, are separated by the membrane. Use cases are e.g. Heating heaters in which the pressure cell by recording the pressures before and after a fan detects whether there is excess or There is negative pressure.
- the support element is an electrical circuit board.
- the bias of the leaf spring can be particularly simple way indirectly by adjusting the deflection adjust the free end of the support element.
- the agents designed to change the position of the clamping point, to pivot the clamping point about an axis.
- the starting point of the switching element which is also particularly true for pressure sockets is movably attached to a membrane by the change the bias is not affected.
- the remaining portion of the leaf spring the width of a spring joint in the area of the recess.
- a central hole or a central bore is opposite lateral recesses preferred because of a higher torsional rigidity is achieved at the clamping point. In this way the spring rate of the leaf spring can be adjusted in particularly fine increments and specify particularly precisely.
- leaf spring means for contactless Switching the electrical contact has.
- the leaf spring itself their deflection an electrical contact without contact switches.
- there is preferably a permanent magnet on the leaf spring provided that e.g. switch a reed contact can.
- the leaf spring material should not be magnetic.
- the leaf spring is clamped on one side and the switching element engages in the area between the end area of the free end and the clamping point on.
- the switching arrangement as a whole can be special be compact, especially with pressure cans, at which the switching element, i.e. the diaphragm plate, usually centrally is arranged.
- Fig. 1 is an arrangement for non-contact switching a electrical contact generally designated 10.
- the switching arrangement 10 is used for the contactless switching of a electrical reed contact 12, which is arranged stationary.
- a switching process is triggered by means of a switching element 14, which is preferably made of plastic.
- the switching element 14 is shown in Fig. 1 as a membrane plate 14 with a elastically deformable membrane 16 is connected.
- the membrane 16 separates a pressure chamber 18 from a pressure chamber 20.
- Das Switching element 14 is on the membrane 16 on the pressure chamber 20th facing side set.
- a printed circuit board 24 is fixed on the carrier 22.
- a free end 32 of the circuit board 24 can consequently be pivoted, as indicated by an arrow 25.
- a clamping block 34 which is preferably is made of plastic.
- the top 36 of the chuck 34 is at an angle 37 of 2 ° to 45 °, in the illustrated Embodiment inclined, for example, by approximately 5 °.
- top 36 there is a single layer, approximately in plan view rectangular leaf spring 38 clamped on one side.
- the free end 40 of the leaf spring 38 points in the opposite direction like the free end 32 of the circuit board 24.
- the Leaf spring 38 In a central region 42 of the free end 40 is the Leaf spring 38 provided with a central hole 44. By the Hole 44 engages a downward pin 46 of the switching element 14.
- the underside of the switching element 14 is also conical tapered so that the top of the leaf spring 38 is touched only in dots or circles.
- the stop 50 can be made in one piece with the stationary support 22 be formed.
- the position of the stop 50 is chosen so that the leaf spring 38 is biased in the rest position.
- the top is also located of the central area 42 of the leaf spring in the rest position directly below the underside of the switching element 14, in such a way that the membrane 16 is relaxed against it Basic position is not deflected.
- a permanent magnet 52 set At the bottom of the end portion 48 is a permanent magnet 52 set.
- FIGS. 3 and 4 each show a pressure measuring device in the form of a Pressure cell 70 with a switching arrangement according to the invention. Elements, which have the same function as the schematic Representation of a switching arrangement in FIGS. 1 and 2, are provided with the same reference numbers.
- the pressure cell 70 has an upper part 72 and a lower part 74 between which the membrane 16 is clamped. Hence becomes an upper between the upper part 72 and the membrane 16 Pressure room 18 set up. Is located below the membrane 16 the second pressure chamber 20.
- the upper part 72 and the lower part 74 are plastic injection molded parts.
- the lower part 74 forms the stationary support 22 and the stop 50.
- the adjusting screw 58 as a simple Grub screw is formed, which is screwed into the lower part 74 and from the outside, i.e. when assembled, can be moved. This enables a fine adjustment of the switching point possible in the assembled pressure can 70.
- the position of the permanent magnet 52 is preferably determined by a characteristic of switching distance 54 over center offset 62 the arrangement of permanent magnet 52 and reed contact 12th
- the pivot point of the free end 32 of the circuit board 24 can be by the location of the hole 28 (or by the location corresponding side recesses) and consequently by narrowing the Set joint width.
- the adjustment sensitivity is low or high.
- the recesses 60 determine the spring rate the leaf spring 38. For different applications the same starting leaf spring by providing different large recesses 60 (or a corresponding hole) is used become. As a result, the switching characteristics of the Pressure cell 70 can be adapted to the particular circumstances.
- the coupling between switching element 14 and leaf spring 38 can also be done so that instead of a hole 44 in the leaf spring 38 a trough is provided in which the as a tip bearing trained pin 46 engages.
- the pressure can 70 according to the invention can be extremely few components. Therefore, no kick Friction or coupling hysteresis.
- the switching arrangement 10 can be adjusted with only a single adjusting screw 58 and fine-tune. This is based on an optimal relative position between permanent magnet 52 and reed contact 12, how they are characterized by a characteristic of switching distance 54 Center offset 62 can be determined.
- Fig. 5 shows in schematic form the arrangement from the free end 32 of a carrier, clamping block 34 and leaf spring 38 in schematic form and serves to explain the setting of the Pretension by swiveling the clamping block 34.
- the free end 32 By exerting a force B on the free end 32, for example by means of the adjusting screw 58, the free end can be 32 around the pivot point A (corresponding to the reference symbol 30 in Fig. 1) pivot.
- a starting position is in solid lines in FIG. 5 shown.
- a swivel position is through dash-dot lines shown.
- the clamping point C In the starting position, the clamping point C is in a position C 1 .
- a force F 1 (at 17) is exerted on a central region of the leaf spring 38, for example by means of the switching element 14, the point D is deflected by a path S * 1 .
- the end 40 1 of the leaf spring 38 is pivoted from a position E 1 to a position from which the reed contact 12 switches. This position is shown as a threshold in FIG. 5.
- the path of the free end 40 1 into the position shown at 40 1 ' is S 1 .
- the operating point (switching force threshold ) is reached at a lower force F 2 when the free end 32 is raised.
- lowering the free end 32 means that the operating point is only reached at a higher force 17.
- FIG. 5 is also at the extreme end of the free end 32 alternative pivot point A 'shown.
- this alternative embodiment would be the mounting block 34 so that it around the pivot point A 'is pivotable. With such a A configuration would pivot the clamping block 34 out the solid position shown in a swivel position upwards by means of a force B the switching force threshold increase.
- FIG. 5 also shows that the free end 40 of the leaf spring 38 does not necessarily have to be pretensioned by a stop 50, as shown in FIG. 1.
- the stop 50 essentially serves to avoid vibrations of the system of membrane 16 and leaf spring 38 with a force 17 of essentially 0 Newton or a pressure difference of essentially 0.
- the prestressing path realized by the stop 50 should then be 5 example shown may be greater than the difference S 1 - S 2 . In other words, the stop 50 should be approximately at the level of E 2 . Then the switching function is not influenced despite the stop 50 over the setting range of the clamping block 34.
- FIG. 6 A variant of a recess 60a in the form of one on a center line the leaf spring hole is shown in Fig. 6. Such a hole 60a is opposite the side recesses 60 of FIG. 2 is preferred since the leaf spring 38 is then more torsionally rigid is stored.
- FIG. 7 shows a further variant in which the leaf spring 38 provided without a hole 44 for a pin of the switching element 14 is.
- the lower end of the switching element is 14a rounded and lies on the leaf spring 42a and can Reduction in friction, for example coated with Teflon his.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
- einem Schaltglied, mittels dessen die Schaltkraft ausgeübt wird,
- einer an einer Einspannstelle einseitig eingespannten Blattfeder, wobei das Schaltglied zum Schalten an der Blattfeder angreift, um die Blattfeder von einer Ruheposition in eine Schaltposition zu bewegen, wobei die Blattfeder in der Ruheposition so angeordnet ist, daß deren Federkraft die vorbestimmte Schaltkraftschwelle bildet.
- Fig. 1
- eine schematische Schnittansicht einer erfindungsgemäßen Schaltanordnung;
- Fig. 2
- eine schematische Schnittansicht entlang der Linie II-II von Fig. 1;
- Fig. 3
- eine perspektivische, teilweise weggeschnittene Ansicht einer Druckdose mit einer erfindungsgemäßen Schaltanordnung von schräg oben; und
- Fig. 4
- eine perspektivische Ansicht der Druckdose der Fig. 3 von schräg unten;
- Fig. 5
- eine weitere schematische Darstellung der erfindungsgemäßen Schaltanordnung;
- Fig. 6
- eine Detailansicht einer bevorzugten alternativen Ausführungsform; und
- Fig. 7
- eine Detailansicht einer weiteren alternativen Ausführungsform.
Claims (16)
- Anordnung (10) zum berührungslosen Schalten eines elektrischen Kontaktes (12) mittels einer eine vorbestimmte Schaltkraftschwelle übersteigenden Schaltkraft (17), miteinem Schaltglied (14), mittels dessen die Schaltkraft (17) ausgeübt wird,einer an einer Einspannstelle (C) einseitig eingespannten Blattfeder (38), wobei das Schaltglied (14) zum Schalten an der Blattfeder (38) angreift, um die Blattfeder (38) von einer Ruheposition in eine Schaltposition (48') zu bewegen, wobei die Blattfeder (38) in der Ruheposition so angeordnet ist, daß deren Federkraft (51) die vorbestimmte Schaltkraftschwelle bildet,
Mittel (58; B) zur Veränderung der Lage (C1, C2) der Einspannstelle (C) vorgesehen sind, so daß durch Veränderung der Lage (C1, C2) der Einspannstelle (C) die Schaltkraftschwelle eingestellt werden kann. - Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Blattfeder (38) in der Ruheposition mittels eines ortsfesten Anschlages (50) vorgespannt ist.
- Anordnung nach Anspruch 2, dadurch gekennzeichnet, daß die Blattfeder (38) mittels des ortsfesten Anschlages (50) so vorgespannt ist, daß die Blattfeder (38) in ihrer Ruhelage im wesentlichen keine Kraft auf das Schaltglied (14) ausübt.
- Anordnung nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die Blattfeder (38) an der Einspannstelle (C) unter einem spitzen Winkel (37) größer 0° zu einer Querebene eingespannt ist, die etwa senkrecht zur Bewegungsrichtung (17) des Schaltgliedes (14) ausgerichtet ist.
- Anordnung nach Anspruch 4, dadurch gekennzeichnet, daß die Schaltanordnung (10), bei ansonsten im wesentlichen unveränderter Konstruktion, mit unterschiedlichen Einspannblökken (34) herstellbar ist, die die Blattfeder (38) jeweils unter einem anderen Winkel (37) einspannen, so daß Schaltanordnungen (10) mit unterschiedlicher Schaltkraftschwelle durch Auswahl des Einstellblockes (34) herstellbar sind.
- Anordnung nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß der Endbereich (48) des freien Endes (40) der Blattfeder (38) mittels eines Anschlages (50) etwa parallel zu der Querebene ausgerichtet ist.
- Anordnung nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß die Einspannstelle (C) der Blattfeder (38) an dem freien Ende (32) eines auskragenden elastischen Tragelementes (24) angeordnet ist.
- Anordnung nach Anspruch 7, dadurch gekennzeichnet, daß die Federrate des Tragelementes (24) wesentlich größer ist als die Federrate der Blattfeder (38).
- Anordnung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß das Tragelement (24) eine elektrische Leiterplatte (24) ist.
- Anordnung nach einem der Ansprüche 7 - 9, dadurch gekennzeichnet, daß das freie Ende (40) der Blattfeder (38) und das freie Ende (32) des Tragelementes (24) in entgegengesetzte Richtungen weisen.
- Anordnung nach einem der Ansprüche 7 - 10, gekennzeichnet durch Mittel (58) zum Verstellen der Auslenkung des freien Endes (32) des Tragelementes (24), um so die Lage (C1, C2) der Einspannstelle (C) zu ändern, um die Schaltkraftschwelle einzustellen.
- Anordnung nach einem der Ansprüche 1 - 11, dadurch gekennzeichnet, daß die Mittel (58; B) zur Veränderung der Lage (C1, C2) der Einspannstelle (C) dazu ausgelegt sind, die Einspannstelle (C) um eine Achse (A) zu verschwenken.
- Anordnung nach Anspruch 12, dadurch gekennzeichnet, daß die Einspannstelle (C) so verschwenkbar ist, daß die Lage des Abschnittes (D) der Blattfeder (38), an dem das Schaltglied (14) angreift, im wesentlichen unverändert bleibt.
- Anordnung nach einem der Ansprüche 1 - 13, dadurch gekennzeichnet, daß die Blattfeder (38) im Bereich der Einspannstelle (C) mit einer Ausnehmung (60; 60a) versehen ist, vorzugsweise mit einem auf der Mittenachse der Blattfeder (38) angeordneten Loch (60a).
- Druckmeßgerät mit wenigstens einem durch eine Membran (16) abgetrennten Druckraum (18, 20), gekennzeichnet durch eine Anordnung (10) gemäß einem der Ansprüche 1 - 14, wobei die Membran (16) mit dem Schaltglied (14) gekoppelt ist.
- Gerät nach Anspruch 15, dadurch gekennzeichnet, daß die vorbestimmte Schaltkraftschwelle im Bereich entsprechend einer Druckdifferenz von einigen wenigen Pascal bis hin zu einigen hundert Pascal liegen kann.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000113816 DE10013816A1 (de) | 2000-03-21 | 2000-03-21 | Anordnung zum berührungslosen Schalten eines elektrischen Kontaktes und Druckmeßgerät |
DE10013816 | 2000-03-21 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1137029A2 true EP1137029A2 (de) | 2001-09-26 |
EP1137029A3 EP1137029A3 (de) | 2003-12-17 |
EP1137029B1 EP1137029B1 (de) | 2008-07-16 |
Family
ID=7635656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010106862 Expired - Lifetime EP1137029B1 (de) | 2000-03-21 | 2001-03-20 | Anordnung zum berührungslosen Schalten eines elektrischen Kontaktes und Druckmessgerät |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1137029B1 (de) |
DE (2) | DE10013816A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2833348A1 (fr) * | 2001-12-12 | 2003-06-13 | In Lhc | Detecteur de pression de fluide |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019105749A1 (de) | 2019-03-07 | 2020-09-10 | Ebm-Papst Landshut Gmbh | Verfahren zur Erkennung eines fehlerhaften Betriebs eines über einen Gleichstrommotor angetriebenen Gasgebläses |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE19300E (en) * | 1934-09-04 | Electric switch | ||
GB1206157A (en) * | 1967-10-20 | 1970-09-23 | Proximity Controls Inc | Magnetic switch devices |
GB1224878A (en) * | 1967-06-09 | 1971-03-10 | Rotax Ltd | Fluid pressure sensitive electric switches |
EP0279390A1 (de) * | 1987-02-17 | 1988-08-24 | Huba Control Ag | Membran-Druckschalter |
DE9108159U1 (de) * | 1991-07-03 | 1991-08-29 | A. Steudler Gmbh & Co Kg, 7530 Pforzheim, De | |
DE9406717U1 (de) * | 1994-03-22 | 1994-06-30 | Steudler Gmbh & Co Kg A | Differenzdruckschalter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1139162A (en) * | 1966-08-18 | 1969-01-08 | Shell Mex Bp Ltd | Pressure operated magnetic switch |
US3585328A (en) * | 1970-02-11 | 1971-06-15 | Texas Instruments Inc | Pressure switch with a plurality of snap acting metal diaphragms coated with metallic oxide |
US5061832A (en) * | 1991-01-28 | 1991-10-29 | Dwyer Instruments, Inc. | Field settable differential pressure switch assembly for low fluid pressure applications |
DE19508014C1 (de) * | 1995-01-12 | 1996-07-11 | Siemens Ag | Mechanischer Beschleunigungsschalter |
-
2000
- 2000-03-21 DE DE2000113816 patent/DE10013816A1/de not_active Ceased
-
2001
- 2001-03-20 DE DE50114105T patent/DE50114105D1/de not_active Expired - Lifetime
- 2001-03-20 EP EP20010106862 patent/EP1137029B1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE19300E (en) * | 1934-09-04 | Electric switch | ||
GB1224878A (en) * | 1967-06-09 | 1971-03-10 | Rotax Ltd | Fluid pressure sensitive electric switches |
GB1206157A (en) * | 1967-10-20 | 1970-09-23 | Proximity Controls Inc | Magnetic switch devices |
EP0279390A1 (de) * | 1987-02-17 | 1988-08-24 | Huba Control Ag | Membran-Druckschalter |
DE9108159U1 (de) * | 1991-07-03 | 1991-08-29 | A. Steudler Gmbh & Co Kg, 7530 Pforzheim, De | |
DE9406717U1 (de) * | 1994-03-22 | 1994-06-30 | Steudler Gmbh & Co Kg A | Differenzdruckschalter |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2833348A1 (fr) * | 2001-12-12 | 2003-06-13 | In Lhc | Detecteur de pression de fluide |
EP1319936A1 (de) * | 2001-12-12 | 2003-06-18 | In-Lhc | Druckdetektor |
Also Published As
Publication number | Publication date |
---|---|
EP1137029A3 (de) | 2003-12-17 |
DE50114105D1 (de) | 2008-08-28 |
EP1137029B1 (de) | 2008-07-16 |
DE10013816A1 (de) | 2001-10-04 |
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