EP1318536A1 - Interrupteur actionné par pression différentielle - Google Patents

Interrupteur actionné par pression différentielle Download PDF

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Publication number
EP1318536A1
EP1318536A1 EP02025125A EP02025125A EP1318536A1 EP 1318536 A1 EP1318536 A1 EP 1318536A1 EP 02025125 A EP02025125 A EP 02025125A EP 02025125 A EP02025125 A EP 02025125A EP 1318536 A1 EP1318536 A1 EP 1318536A1
Authority
EP
European Patent Office
Prior art keywords
piston
differential pressure
pressure switch
switch according
tip
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.)
Withdrawn
Application number
EP02025125A
Other languages
German (de)
English (en)
Inventor
Frank Pechhold
Arno Marto
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
Beru AG
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 Beru AG filed Critical Beru AG
Publication of EP1318536A1 publication Critical patent/EP1318536A1/fr
Withdrawn legal-status Critical Current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
    • 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 invention relates to a differential pressure switch according to the preamble of claim 1.
  • a disadvantage of the known differential pressure switches of the generic type is the fact that the switching operation by means of pistons and switching elements in the liquid or gaseous Medium takes place, the pressure of which is measured or whose pressure is to be used for switching.
  • the object of the invention is a differential pressure switch or sensor available, in which the actual switching or display process unaffected by Type, temperature and / or pressure of the medium takes place; nevertheless, it should be simple to build and economical to manufacture his; the penetration of moisture be prevented to the occurrence of fault currents in the Area of the switching element that hinder the switching operations can avoid.
  • the object of the invention is achieved by the differential pressure switch, in the same way as a differential pressure sensor can be formed according to the characteristic feature of Claim 1 solved. Further advantageous embodiments of the The subject of the invention result from the following Claims 2 to 7.
  • a piston 1 in a cylinder bore 2 together with a Spring 9 arranged as a return element.
  • the piston foot 1a is in communication with a medium under a pressure P 1 in space or line 8; this space can be, for example, the inlet side of a medium filter.
  • the area of the bore 2 around the tapered piston shaft 1b is connected via a line 7 to a medium under a pressure P 2 , which may be the connection to the clean side of the medium filter mentioned. If the pressure P 1 of the medium increases in comparison to the pressure P 2 , the piston 1 is set in motion in the axial direction; when the differential pressure drops, the piston 1 is moved back into its starting position by the spring 9.
  • the piston tip 1c which triggers the switching or display process, is sealed off from the medium under the pressure P 2 .
  • a funnel-shaped roller membrane 4 sealing the piston area under the piston tip 1c.
  • the tubular region 4a of the rolling membrane 4 is here preferably circular in a piston region circumferential groove stored and in this way against axial Movement secured.
  • the funnel-shaped wall 4b Roll membrane 4 is made by sealing the cylinder bore led out the end of the hole.
  • it can be in be arranged and formed to the extent that the corresponds to the maximum axial piston movement without this affect.
  • This is made possible by the fact that preferably slightly conical wall 4b Roll membrane 4 can roll in the free space. Also suitable it is when the axial extensibility of the material of the roll membrane area 4b meets these requirements, whereby then the arrangement of the roller membrane areas 4b is not movable have to be.
  • the return spring 9 rests on a shim 13 for restoring force.
  • the switching element has an upper part 11 and a lower part 10 (as a spacer) with internal sensors, contacts or similar known per se Stekergeophuse 12 and switching element 10/11 are via an O-ring 6 connected as a sealing ring; this makes control room of the Environment sealed according to the IP 67 standard.
  • differential pressure switch or Pressure sensor allows the rolling membrane 4 to move axially Piston 1, while simultaneously the switching or display area 5, i.e. the area surrounding the piston tip 1c, opposite the cylinder bore 2 and the one located therein Medium seals.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP02025125A 2001-12-05 2002-11-08 Interrupteur actionné par pression différentielle Withdrawn EP1318536A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10159536A DE10159536A1 (de) 2001-12-05 2001-12-05 Differenzdruckschalter-sensor
DE10159536 2001-12-05

Publications (1)

Publication Number Publication Date
EP1318536A1 true EP1318536A1 (fr) 2003-06-11

Family

ID=7708001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02025125A Withdrawn EP1318536A1 (fr) 2001-12-05 2002-11-08 Interrupteur actionné par pression différentielle

Country Status (3)

Country Link
US (1) US6621021B2 (fr)
EP (1) EP1318536A1 (fr)
DE (1) DE10159536A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2507720C (fr) * 2005-05-18 2011-07-12 Kenneth Brad Hillman Enceinte anti-rotatoire pour boitier de manostat
US7297885B2 (en) * 2005-08-29 2007-11-20 Paul Chia Lee Pressure switch
US7112753B1 (en) * 2005-08-29 2006-09-26 Paul-Chia Lee Pressure switch
US7966804B2 (en) * 2006-07-12 2011-06-28 General Electric Company Method and apparatus for testing gas turbine engines
US7891607B2 (en) * 2006-10-18 2011-02-22 The Boeing Company Pressure sensor device
CN101430987B (zh) * 2007-11-06 2012-05-30 上海立新液压有限公司 一种压力继电器
CA2813871C (fr) 2013-04-19 2016-05-31 Canadian Heating Products Inc. Systeme de refroidissement pour foyer au gaz

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468768A (en) * 1949-05-03 Means to indicate the presence of
US4339955A (en) * 1980-08-29 1982-07-20 Aisin Seiki Company, Ltd. Pressure sensor
US4460812A (en) * 1981-03-11 1984-07-17 Aisin Seiki Kabushiki Kaisha Pneumatically operated switch assembly
US4654643A (en) * 1985-07-22 1987-03-31 Meisenheimer Jr Daniel T Pressure sensor-monitor and excessive pressure level indicator
EP0676785A2 (fr) * 1994-04-06 1995-10-11 FILTERWERK MANN & HUMMEL GMBH Interrupteur actionné par pression différentielle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486247A (en) * 1967-05-23 1969-12-30 Francis L Franet Ski boot construction
US4503301A (en) * 1983-03-24 1985-03-05 American Standard Inc. Differential fluid pressure switch
JPS612221A (ja) * 1984-06-14 1986-01-08 本田技研工業株式会社 圧力スイツチ
JPS6323744U (fr) * 1986-07-29 1988-02-17
US4703140A (en) * 1986-11-18 1987-10-27 General Electric Company Electric circuit controlling device
JP2520963Y2 (ja) * 1990-10-31 1996-12-18 矢崎総業株式会社 圧力スイッチ
US5538185A (en) * 1992-05-29 1996-07-23 Rabitsch; Benjamin F. Vehicle mounted liquid spray apparatus
US5320280A (en) * 1992-06-19 1994-06-14 Graco Inc. Pneumatically controlled spraying system having a diaphragm-operated switch
US5278367A (en) * 1992-12-08 1994-01-11 Texas Instruments Incorporated High pressure responsive switch and method for making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468768A (en) * 1949-05-03 Means to indicate the presence of
US4339955A (en) * 1980-08-29 1982-07-20 Aisin Seiki Company, Ltd. Pressure sensor
US4460812A (en) * 1981-03-11 1984-07-17 Aisin Seiki Kabushiki Kaisha Pneumatically operated switch assembly
US4654643A (en) * 1985-07-22 1987-03-31 Meisenheimer Jr Daniel T Pressure sensor-monitor and excessive pressure level indicator
EP0676785A2 (fr) * 1994-04-06 1995-10-11 FILTERWERK MANN & HUMMEL GMBH Interrupteur actionné par pression différentielle

Also Published As

Publication number Publication date
US20030102203A1 (en) 2003-06-05
US6621021B2 (en) 2003-09-16
DE10159536A1 (de) 2003-06-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17P Request for examination filed

Effective date: 20030521

17Q First examination report despatched

Effective date: 20030825

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 20040105