EP1434245B1 - Differentialdruckschalter - Google Patents

Differentialdruckschalter Download PDF

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Publication number
EP1434245B1
EP1434245B1 EP03079064A EP03079064A EP1434245B1 EP 1434245 B1 EP1434245 B1 EP 1434245B1 EP 03079064 A EP03079064 A EP 03079064A EP 03079064 A EP03079064 A EP 03079064A EP 1434245 B1 EP1434245 B1 EP 1434245B1
Authority
EP
European Patent Office
Prior art keywords
membrane
sensor
pressure switch
chamber
lever
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
Application number
EP03079064A
Other languages
English (en)
French (fr)
Other versions
EP1434245A1 (de
Inventor
Marco Gerolamo Omati
Ennio Omati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ma-Ter Srl
Original Assignee
Ma-Ter Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ma-Ter Srl filed Critical Ma-Ter Srl
Publication of EP1434245A1 publication Critical patent/EP1434245A1/de
Application granted granted Critical
Publication of EP1434245B1 publication Critical patent/EP1434245B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • the present invention concerns a differential pressure switch.
  • differential pressure switches comprising two distinct inlets for two different fluids which exert on opposite faces of a deformable membrane, respectively, a first and a second pressure.
  • the pressure switch is sensitive to the difference in said pressures, in that the membrane moves in one sense or in the other one, thus activating or disactivating a sensing member (for instance the push-button of an electric switch), depending on whether the first pressure is greater or smaller than the second one.
  • US-A-3 207 868 discloses an electric switch mechanism according to the preamble of claim 1.
  • object of the present invention is to provide a differential pressure switch that is more sensitive than the known pressure switches with equal conditions and dimensions.
  • a differential pressure switch 4 according to the invention is shown.
  • the pressure switch comprises a base 30, a cap 31, a cover or lid 32 put onto the cap 31 and a clamp 33 suitable to keep the base 30 and the cover 32 united to each other with the cap 31 interposed between the two.
  • An internal partition 40 of the cap 31 separates the internal space of the pressure switch in a first chamber 41 and a second chamber 42 that are watertight with respect to the other one ( Figure 6).
  • a deformable round membrane 3 is located inside the chamber 41 and is peripherally fastened between the base 30 and the cap 31.
  • the base 30 is provided with a first inlet 1 for a first fluid destined to operate at a pressure P1 on a face of the membrane 3 and a second inlet 2 communicating with a passage 20 is provided in the cover 32 and cap 31 for a second fluid destined to operate at a pressure P2 on the opposite face of the membrane 3 ( Figures 1-3).
  • the membrane 3 supports a rigid plate 5 fastened to the membrane 3 by means of a "RESCA" system, that is fastened at the center and at an intermediate point 34 of the membrane 3.
  • a central projection 6 is obtained that is suitable to house a reaction spring 7 arranged between the plate 5 and the cap 31.
  • a sensor for the position of the membrane is housed, that in the example being considered is made up of a microswitch 8 which operates on an external electric circuit not visible in the figures.
  • the microswitch 8 is provided with an activation push-button 13, visible in Figure 4.
  • the pressure switch comprises a lever 10 made up of a first lever arm 9 housed in the chamber 41 and engaged with the plate 5 and a second lever arm or actuator 11 housed in the chamber 42 ( Figures 4-6).
  • the lever arm 10 and the actuator 11 are made integral with a revolving shaft or fulcrum 12 with watertight packings 43, arranged parallel to the plate 5 and fastened to the cap 31.
  • the actuator 11 can thus operate on the push-button 13 so as to cause switching of the microswitch 8.
  • the lever 9 formed by the arm 10 and the actuator 11 amplifies the upward movement of the membrane 3 and therefore increases the sensitivity of the pressure switch with equal dimensions and conditions.
  • a calibration dowel 14 located inside the inlet 1 allows the adjustment of the position of the actuator 11 with respect to the push-button 13 of the microswitch 8.
  • the microswitch 8 is in a completely separate chamber 42, which is watertight with respect to the chamber 41 in which there is the fluid entered through the inlet 2. This allows to use the above described pressure switch both for gas and for liquids, possibly even in the presence of an electric sensor as the microswitch 8.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Vehicle Body Suspensions (AREA)
  • Measuring Fluid Pressure (AREA)

Claims (2)

  1. Differenzialdruckschalter, aufweisend einen ersten (1) und einen zweiten (2) Einlass für ein erstes und ein zweites Fluid, die jeweils auf gegenüber liegende Seiten einer verformbaren Membran (3) wirken, um so entgegengesetzte Bewegungen der Membran (3) zur Aktivierung oder Deaktivierung eines Sensors (8, 13) als eine Funktion des Druckunterschieds zwischen dem ersten und dem zweiten Fluid festzulegen, eine Hebeleinrichtung (9), die zwischen der Membran (3) und dem Sensor (8, 13) zwischengeordnet ist, um die durch die Membran (3) gesteuerten Bewegungen in der Richtung des Sensors (8, 13) zu verstärken, eine an der Membran (3) in dem Arbeitsbereich der Membran (3) an der Hebeleinrichtung (9) befestigte, starre Platte (5), wobei die Hebeleinrichtung (9) einen ersten Hebelarm (10), der mit der Platte (5) zusammenwirkt, und einen zweiten Hebelarm oder Aktuator (11), der fähig ist, auf den Sensor (8, 13) zu wirken, aufweist,
    dadurch gekennzeichnet, dass die Membran (3) und der erste Hebelarm (10) in einer ersten Kammer (41) aufgenommen sind und der zweite Hebelarm oder Aktuator (12) und der Sensor (8, 13) in einer zweiten Kammer (42) getrennt und wasserdicht in Bezug auf die erste Kammer (41) aufgenommen ist.
  2. Druckschalter nach Anspruch 1, dadurch gekennzeichnet, dass die Hebelarme (10, 11) miteinander durch eine Welle oder ein Gelenk (12) verbunden sind, die/das sich um eine feste Achse im Wesentlichen parallel zu der Ebene der Platte (5) dreht.
EP03079064A 2002-12-24 2003-12-16 Differentialdruckschalter Expired - Lifetime EP1434245B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20022761 2002-12-24
IT002761A ITMI20022761A1 (it) 2002-12-24 2002-12-24 Pressostato differenziale

Publications (2)

Publication Number Publication Date
EP1434245A1 EP1434245A1 (de) 2004-06-30
EP1434245B1 true EP1434245B1 (de) 2005-10-12

Family

ID=32448932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03079064A Expired - Lifetime EP1434245B1 (de) 2002-12-24 2003-12-16 Differentialdruckschalter

Country Status (7)

Country Link
EP (1) EP1434245B1 (de)
CN (1) CN1327464C (de)
AT (1) ATE306717T1 (de)
DE (1) DE60301846T2 (de)
ES (1) ES2247483T3 (de)
HK (1) HK1065887A1 (de)
IT (1) ITMI20022761A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392477B1 (it) * 2008-12-18 2012-03-09 Ma Ter Srl Pressostato elettromeccanico con sistema di amplificazione a leva svantaggiosa

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207868A (en) * 1962-02-28 1965-09-21 Cutler Hammer Inc Snap action electric switch mechanism
US3281554A (en) * 1964-09-29 1966-10-25 Westinghouse Air Brake Co Pressure operated switch with a friction clutch
US4914264A (en) * 1988-07-11 1990-04-03 Robertshaw Controls Company Control device having a self-supporting switch unit therein
CN1307349A (zh) * 2000-01-27 2001-08-08 株式会社不二工机 压力开关

Also Published As

Publication number Publication date
DE60301846T2 (de) 2006-11-16
CN1327464C (zh) 2007-07-18
ITMI20022761A1 (it) 2004-06-25
EP1434245A1 (de) 2004-06-30
ES2247483T3 (es) 2006-03-01
ATE306717T1 (de) 2005-10-15
HK1065887A1 (en) 2005-03-04
DE60301846D1 (de) 2005-11-17
CN1510707A (zh) 2004-07-07

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