EP1643520B1 - Druckschalter mit Schutz der Membran gegen Überdehnung - Google Patents

Druckschalter mit Schutz der Membran gegen Überdehnung Download PDF

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Publication number
EP1643520B1
EP1643520B1 EP05018612A EP05018612A EP1643520B1 EP 1643520 B1 EP1643520 B1 EP 1643520B1 EP 05018612 A EP05018612 A EP 05018612A EP 05018612 A EP05018612 A EP 05018612A EP 1643520 B1 EP1643520 B1 EP 1643520B1
Authority
EP
European Patent Office
Prior art keywords
membrane
pressure
pressure switch
housing
max
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.)
Not-in-force
Application number
EP05018612A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1643520A1 (de
Inventor
Markus Trisner
Joachim Korherr
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.)
BCS Automotive Interface Solutions GmbH
Original Assignee
BCS Automotive Interface Solutions GmbH
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 BCS Automotive Interface Solutions GmbH filed Critical BCS Automotive Interface Solutions GmbH
Publication of EP1643520A1 publication Critical patent/EP1643520A1/de
Application granted granted Critical
Publication of EP1643520B1 publication Critical patent/EP1643520B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • 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
    • H01H35/2685—Means to protect pressure sensitive element against over pressure
    • 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 the field of pressure switches for pressures up to a maximum allowable pressure.
  • a pressure acts on a membrane.
  • the membrane undergoes a deflection and is thereby stretched.
  • This deflection corresponds to a stroke, e.g. can be transmitted via a plunger to an electrical contact system.
  • the deflection of the membrane under pressure must be limited by a stop, as this can be overstretched at too high pressure. Usually prevents a mechanical stop this overstretching.
  • a corresponding stop must be very accurate. Conventionally, these stops are made by machining or pressing machining. They are therefore always subject to manufacturing tolerances, which means that either the maximum allowable stroke of the membrane is not utilized or exceeded. Exceeding the maximum allowable stroke may damage the diaphragm.
  • a method is to be provided, with which a pressure switch can be produced, which has a mechanical stop for the membrane, against which the membrane rests when exposed to the maximum permissible pressure over the entire surface.
  • the pressure switch according to the invention for pressures up to a maximum allowable pressure p max has a housing and a membrane, wherein the membrane is mounted in the housing.
  • the membrane has a side on which a pressure can act and is deflected when pressure is applied to it.
  • the membrane is secured in the housing so that the deflection of the membrane leads to an expansion.
  • the pressure switch further comprises a device that converts the membrane deflection into a stroke, and an electrical contact system that cooperates with the device.
  • the device causes a diaphragm deflection to result in actuation of the electrical contact system.
  • the pressure switch further comprises a cast stop, which completely fills a cavity between an inner wall of the housing and the side of the membrane facing away from the pressure, when the membrane is subjected to the maximum permissible pressure p max .
  • the invention also provides a method of manufacturing a pressure switch for pressures up to a maximum allowable pressure p max .
  • the method comprises the steps of: attaching a membrane in a housing, the membrane having a side on which a pressure p can act; Pressurizing the diaphragm with the maximum permissible pressure p max , whereby the membrane is bent; Filling a cavity, which forms between a housing inner wall and a side of the membrane, which faces away from the pressure, with a liquid potting compound, while the maximum allowable pressure p max is maintained.
  • the hardening of the potting compound results in the cast stop, which completely fills the cavity.
  • casting compounds for example, polyurethane or epoxy resins can be used.
  • the curing can be through Heat supply (eg inductive) to be accelerated. Another way to accelerate curing is by exposure to light.
  • the unavoidable in machining or pressing processing manufacturing tolerances eliminated.
  • the stop is individually adapted to the membrane and thus can compensate for manufacturing tolerances of the membrane. The membrane is fully exposed to the stop when exposed to the maximum permissible pressure p max . This can not lead to a local overstretching.
  • the device for transmitting the membrane deflection is a plunger which is guided by the housing.
  • the membrane is made of metal.
  • the stop consists of a hardened potting compound.
  • FIG. 1 shows a section of a section of a pressure switch in conventional technology with its essential parts.
  • a membrane 2 is fixed, which is shown in a state in which no pressure is applied to the membrane.
  • the housing inner wall is machined so that stop surfaces 3 are formed to prevent overstretching of the membrane 2.
  • a plunger 4 is used to implement the membrane bend in a hub, which is forwarded to an unillustrated electrical contact system.
  • Figure 2 shows the same pressure switch upon application of a pressure p, which is smaller than the maximum allowable pressure P max . Due to the manufacturing tolerances in the production of the abutment surfaces 3, the membrane 2 is already in some places at the stop, although the maximum allowable pressure p max has not yet been reached. The position of the membrane 2 in the unpressurized state is indicated by dashed lines. Tappet 4 is deflected by a stroke s.
  • the sectional view in FIG. 3 shows a corresponding pressure switch in which, due to manufacturing tolerances, the membrane 2 does not touch the stop surfaces 3 or at least not completely, although pressure p has already reached or even exceeded the maximum permissible pressure p max .
  • the maximum possible stroke s is undershot by a distance ⁇ s. The possible hub is therefore not fully utilized.
  • the membrane can be overstretched.
  • FIG. 4 shows a section of a pressure switch according to the invention during the manufacturing process.
  • a housing 1 has a uniform wall thickness, there is no stop surface incorporated.
  • a membrane 2 is is clamped with its peripheral edge on the housing 1 and is subjected to a maximum allowable pressure p max .
  • the membrane 2 is therefore in the maximum permissible stretched state.
  • a plunger 4 is deflected by the maximum stroke s.
  • a cavity is formed. This cavity is now filled through an opening 7 of the housing 1 with a liquid potting compound to pour a stopper 5 with an optimally adapted stop surface 6 ( Figure 5).
  • the sealing compound is cured. This process can be accelerated by inductive heat. Depending on the material used, an acceleration by light is possible. After curing of the potting compound, the pressure p max can be removed.
  • Figure 5 shows the pressure switch according to the invention after curing of the sealing compound.
  • Diaphragm 2 is in unloaded condition, there is no pressure on the pressure switch.
  • Tappet 4 is not deflected.
  • the cured potting compound such as a polyurethane resin or an epoxy resin, forms a stop 5, which occupies the cavity of Figure 4 completely.
  • Stop 5 has a stop surface 6, against which the membrane 2 is applied over the entire surface when acted upon by the maximum pressure p max . With the stop 5 ensures that the membrane 2 is not overstretched, but the maximum possible stroke s is utilized.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Manufacture Of Switches (AREA)
EP05018612A 2004-09-29 2005-08-26 Druckschalter mit Schutz der Membran gegen Überdehnung Not-in-force EP1643520B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004047293A DE102004047293A1 (de) 2004-09-29 2004-09-29 Druckschalter mit Schutz der Membran gegen Überdehnung

Publications (2)

Publication Number Publication Date
EP1643520A1 EP1643520A1 (de) 2006-04-05
EP1643520B1 true EP1643520B1 (de) 2007-09-19

Family

ID=35241350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05018612A Not-in-force EP1643520B1 (de) 2004-09-29 2005-08-26 Druckschalter mit Schutz der Membran gegen Überdehnung

Country Status (7)

Country Link
US (1) US7157654B2 (pt)
EP (1) EP1643520B1 (pt)
JP (1) JP4084815B2 (pt)
KR (1) KR100736644B1 (pt)
CN (1) CN100399485C (pt)
BR (1) BRPI0504086A (pt)
DE (2) DE102004047293A1 (pt)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047293A1 (de) 2004-09-29 2006-04-13 Trw Automotive Electronics & Components Gmbh & Co. Kg Druckschalter mit Schutz der Membran gegen Überdehnung
JP2016091887A (ja) * 2014-11-07 2016-05-23 株式会社鷺宮製作所 接点付きダイヤフラムを製造する方法、および、それにより製造された接点付きダイヤフラムを備える圧力スイッチ
CN105527052A (zh) * 2016-01-14 2016-04-27 湖北江汉石油仪器仪表股份有限公司 一种胶杯式立管压力传感器的胶杯保护结构
CN108305814B (zh) * 2018-02-27 2024-04-16 四川新川航空仪器有限责任公司 一种具有长期承受超高过载的压力信号器

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE5975C (de) A. WEBER & F. ORTMANN in Grumme bei Bochum Fallbühne für Schachtbremsberge mit söhligen Mittelstrecken
DD5975A (pt) *
GB1077825A (en) * 1963-10-18 1967-08-02 Texas Instruments Inc Fluid pressure-responsive devices
GB2005474B (en) * 1977-09-29 1982-04-07 Texas Instruments Inc Condition responsive devices
US4145588A (en) * 1977-09-29 1979-03-20 Texas Instruments Incorporated Condition responsive apparatus having freely disposed disc
DE2750419C3 (de) * 1977-11-11 1981-11-26 Fa. Leopold Kostal, 5880 Lüdenscheid Druckmittelbetätigter elektrischer Kleinschalter
JPS5982936U (ja) 1982-11-26 1984-06-05 株式会社テージーケー ３動作型圧力スイツチ
US4591677A (en) 1985-02-07 1986-05-27 Tgk Company, Limited Three-function pressure switch
DE3541298C1 (en) * 1985-11-22 1987-04-02 Rudolf Barger Gmbh Pneumatically controllable electrical switch
DE3935298A1 (de) * 1989-10-24 1991-04-25 Bosch Gmbh Robert Reifendrucksensor fuer fahrzeuge
US5149927A (en) 1991-04-05 1992-09-22 Eaton Corporation Binary action pressure switch
US5296659A (en) * 1993-01-19 1994-03-22 Viz Manufacturing Company, Inc. Differential pressure monitoring device
CN2283304Y (zh) * 1996-08-23 1998-06-03 代子猷 流体压敏开关
CN1307349A (zh) * 2000-01-27 2001-08-08 株式会社不二工机 压力开关
US6410870B1 (en) * 2000-03-24 2002-06-25 Tecmark Corporation Pneumatic actuated switch
US6255609B1 (en) * 2000-06-26 2001-07-03 Predator Systems, Inc. High pressure resistant, low pressure actuating sensors
DE102004047293A1 (de) 2004-09-29 2006-04-13 Trw Automotive Electronics & Components Gmbh & Co. Kg Druckschalter mit Schutz der Membran gegen Überdehnung
SG178125A1 (en) * 2009-08-03 2012-03-29 Univ Miami Method for in vivo expansion of t regulatory cells

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
KR20060051778A (ko) 2006-05-19
JP4084815B2 (ja) 2008-04-30
BRPI0504086A (pt) 2007-09-25
EP1643520A1 (de) 2006-04-05
DE502005001522D1 (de) 2007-10-31
DE102004047293A1 (de) 2006-04-13
CN1755858A (zh) 2006-04-05
US20060065513A1 (en) 2006-03-30
KR100736644B1 (ko) 2007-07-09
JP2006100270A (ja) 2006-04-13
CN100399485C (zh) 2008-07-02
US7157654B2 (en) 2007-01-02

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