EP0883147A2 - Interrupteur différentiel hydraulique ou pneumatique - Google Patents

Interrupteur différentiel hydraulique ou pneumatique Download PDF

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Publication number
EP0883147A2
EP0883147A2 EP98110071A EP98110071A EP0883147A2 EP 0883147 A2 EP0883147 A2 EP 0883147A2 EP 98110071 A EP98110071 A EP 98110071A EP 98110071 A EP98110071 A EP 98110071A EP 0883147 A2 EP0883147 A2 EP 0883147A2
Authority
EP
European Patent Office
Prior art keywords
switch
electric switch
electric
spring
movable
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
Application number
EP98110071A
Other languages
German (de)
English (en)
Other versions
EP0883147B1 (fr
EP0883147A3 (fr
Inventor
Giorgio Viezzoli
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.)
VIMATIC S.R.L.
Original Assignee
Vimatic 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 Vimatic Srl filed Critical Vimatic Srl
Publication of EP0883147A2 publication Critical patent/EP0883147A2/fr
Publication of EP0883147A3 publication Critical patent/EP0883147A3/fr
Application granted granted Critical
Publication of EP0883147B1 publication Critical patent/EP0883147B1/fr
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
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
    • H01H11/0012—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches for converting normally open to normally closed switches and vice versa
    • 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
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Definitions

  • the present invention relates to a hydraulic or pneumatic pressure differential electric switch.
  • a further drawback is that the mentioned pressure differential electric switches are very complex construction-wise, and have a very high cost.
  • the aim of the present invention is to overcome the above mentioned drawbacks, by providing a hydraulic or pneumatic pressure differential electric switch having a very small size and which, consequently, can be easily installed in a lot of operating systems.
  • a main object of the present invention is to provide such an electric switch which comprises a small number of component elements, thereby reducing both the assembling complexity and the wearing and damaging possibilities thereof.
  • a further object of the present invention is to provide such a switch which can electrically operate as a pressure differential, either of a positive, or possibly even of a pulsating type, between two environments, occurs.
  • a further object of the present invention is to provide such an electric switch which, owing to its specifically designed constructional features, is very reliable and safe in operation.
  • Yet another object of the present invention is to provide such an electric switch which is very competitive from a mere economic standpoint.
  • a hydraulic or pneumatic pressure differential electric switch characterized in that said switch comprises a switch body, defining a chamber herein which can be arranged between two hydraulic or pneumatic pressurized regions, in said chamber being tightly movable, under the pressure differential between said two regions, a movable electric contact, cooperating with a fixed electric contact supported by said switch body through a dielectric spacer element, counter-biassing resilient means operating on said movable electric contact being moreover provided.
  • the subject switch which is generally indicated by the reference number 1, comprises a switch body 2 defining therein a chamber 3 which, through respective inlets 4 and 5, communicates with two hydraulically or pneumatically pressurized regions 6 and 7.
  • a sealing annular or ring-like element 8 for properly tightly separating the regions 6 and 7, is provided.
  • a movable electric contact 10 which is substantially formed by a small piston affected by resilient means comprising, for example, a spring 11.
  • said movable contact 10 cooperates with a fixed contact 12, the latter being supported by the switch body 2 through a dielectric spacer element or shim 13.
  • the electric switch is herein shown in a normally closed condition.
  • the pressure differential being absent, the movable contact 10, electrically contacting the switch body 2, closes the circuit, by contacting the fixed contact 12.
  • FIG 3 illustrates a conceptually identical electric switch, the sole difference being that the switch body 1 is directly formed on the equipment thereon the electric switch is assembled.
  • the operating difference between the normally open electric switch and the normally closed switch can be merely obtained by reversing the position of the spring 11 and the plunger or movable contact 10.
  • the fixed electric contact herein indicated by 20, can comprise a proximity sensor, of a per se known type, for example a magnetic, inductive or capacitive sensor, adapted to open or close or reverse the inner contacts, as the movable electric contact 10, which can optionally include a magnet 21, is moved away or toward the proximity sensor, under the differential pressure generated between the mentioned two regions 6 and 7.
  • a proximity sensor of a per se known type, for example a magnetic, inductive or capacitive sensor, adapted to open or close or reverse the inner contacts, as the movable electric contact 10, which can optionally include a magnet 21, is moved away or toward the proximity sensor, under the differential pressure generated between the mentioned two regions 6 and 7.
  • the sole electrically conductive element will be constituted by the proximity sensor.
  • the electric switch according to the invention will allow to preset the opening and closing time of the switch, with respect to the pressure differential, by simply determining the load on the spring, both with a preset spring, and varying the preload thereon by arranging a spacer element or shim 30 in the bearing region of the end of the spring, as is schematically shown in figure 7, and continuously varying the preset value of the preload, by a threaded ring nut 31, affected by the spring 11.
  • dielectric spacer or shim element 13 can be made in different colors, thereby providing a sort of codifying of the spring 11 load.
  • the electric switch according to the invention is particularly suitable for application in apparatus operating as filtering apparatus, as well as in reciprocating hydraulic pumps, of the pulsating pressure type.
  • the electric switch according to the invention allows to obtain a very great reduction of space and cost, due to the very reduced number of the component elements thereof and due to their very simple configurations.
  • Another important feature of the present device is that it would allow to easily control the hydraulic operation of one or more circuits, by simply monitoring the actual pressure differential.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Braking Systems And Boosters (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19980110071 1997-06-03 1998-06-03 Interrupteur différentiel hydraulique ou pneumatique Expired - Lifetime EP0883147B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPV970007U 1997-06-03
IT97PV000007 IT243620Y1 (it) 1997-06-03 1997-06-03 Interruttore elettrico a differenziale di pressione idraulica opneumatica

Publications (3)

Publication Number Publication Date
EP0883147A2 true EP0883147A2 (fr) 1998-12-09
EP0883147A3 EP0883147A3 (fr) 1999-08-11
EP0883147B1 EP0883147B1 (fr) 2005-09-14

Family

ID=11397383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980110071 Expired - Lifetime EP0883147B1 (fr) 1997-06-03 1998-06-03 Interrupteur différentiel hydraulique ou pneumatique

Country Status (4)

Country Link
EP (1) EP0883147B1 (fr)
DE (1) DE69831529T2 (fr)
ES (1) ES2251050T3 (fr)
IT (1) IT243620Y1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1293586C (zh) * 2003-09-28 2007-01-03 沈鍀桓 微调式流体控制开关
ITMI20111057A1 (it) * 2011-06-13 2012-12-14 Renzo Oldani Apparecchiatura per il sezionamento di un flusso di energia elettrica in uno o piu' conduttori.
CN115692050A (zh) * 2022-09-07 2023-02-03 中国科学院电工研究所 一种脉冲大电流开关装置的开关机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335073A (en) * 1940-12-27 1943-11-23 United Aircraft Corp Pressure actuated switch
US2772409A (en) * 1952-01-22 1956-11-27 Smiths Jacking Systems Ltd Pressure responsive flow indicator
US3154049A (en) * 1962-02-19 1964-10-27 Screen Products Inc Magnetic pressure indicator
US4480160A (en) * 1982-08-31 1984-10-30 Donaldson Company, Inc. Differential pressure switch
US4614849A (en) * 1985-04-18 1986-09-30 Lectron Products, Inc. Electrical pressure switch
US5187337A (en) * 1990-10-23 1993-02-16 Atsugi Unisia Corporation Fluid pressure actuated switch for fluid pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335073A (en) * 1940-12-27 1943-11-23 United Aircraft Corp Pressure actuated switch
US2772409A (en) * 1952-01-22 1956-11-27 Smiths Jacking Systems Ltd Pressure responsive flow indicator
US3154049A (en) * 1962-02-19 1964-10-27 Screen Products Inc Magnetic pressure indicator
US4480160A (en) * 1982-08-31 1984-10-30 Donaldson Company, Inc. Differential pressure switch
US4614849A (en) * 1985-04-18 1986-09-30 Lectron Products, Inc. Electrical pressure switch
US5187337A (en) * 1990-10-23 1993-02-16 Atsugi Unisia Corporation Fluid pressure actuated switch for fluid pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1293586C (zh) * 2003-09-28 2007-01-03 沈鍀桓 微调式流体控制开关
ITMI20111057A1 (it) * 2011-06-13 2012-12-14 Renzo Oldani Apparecchiatura per il sezionamento di un flusso di energia elettrica in uno o piu' conduttori.
WO2012176222A1 (fr) * 2011-06-13 2012-12-27 Energy Global Green Solutions S.P.A. In Forma Abbreviata Eggs. S.P.A. Dispositif de coupure d'un flux d'énergie électrique dans un ou plusieurs conducteurs, et centrale électrique comprenant ledit dispositif
US9013070B2 (en) 2011-06-13 2015-04-21 Energy Global Green Solutions S.P.A. Apparatus for sectioning an electric energy flow in one or more conductors, and an electric energy generating plant comprising said apparatus
CN115692050A (zh) * 2022-09-07 2023-02-03 中国科学院电工研究所 一种脉冲大电流开关装置的开关机构
CN115692050B (zh) * 2022-09-07 2023-08-15 中国科学院电工研究所 一种脉冲大电流开关装置的开关机构

Also Published As

Publication number Publication date
EP0883147B1 (fr) 2005-09-14
ITPV970007U1 (it) 1998-12-03
ITPV970007V0 (it) 1997-06-03
ES2251050T3 (es) 2006-04-16
IT243620Y1 (it) 2002-03-05
DE69831529T2 (de) 2006-07-13
DE69831529D1 (de) 2005-10-20
EP0883147A3 (fr) 1999-08-11

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