EP0284948A2 - Pressostat - Google Patents

Pressostat Download PDF

Info

Publication number
EP0284948A2
EP0284948A2 EP88104525A EP88104525A EP0284948A2 EP 0284948 A2 EP0284948 A2 EP 0284948A2 EP 88104525 A EP88104525 A EP 88104525A EP 88104525 A EP88104525 A EP 88104525A EP 0284948 A2 EP0284948 A2 EP 0284948A2
Authority
EP
European Patent Office
Prior art keywords
microswitch
plunger
pressure switch
pressure
rocker arm
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
EP88104525A
Other languages
German (de)
English (en)
Other versions
EP0284948B1 (fr
EP0284948A3 (en
Inventor
Hubert Franz Strzodka
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.)
Imo Industries GmbH
Original Assignee
Imo Industries GmbH
DeLaval Turbine 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 Imo Industries GmbH, DeLaval Turbine GmbH filed Critical Imo Industries GmbH
Priority to AT88104525T priority Critical patent/ATE84909T1/de
Publication of EP0284948A2 publication Critical patent/EP0284948A2/fr
Publication of EP0284948A3 publication Critical patent/EP0284948A3/de
Application granted granted Critical
Publication of EP0284948B1 publication Critical patent/EP0284948B1/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
    • 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
    • H01H35/2628—Means for adjustment of "ON" or "OFF" operating pressure by varying the relative position of switch-casing and pressure sensitive element
    • 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

Definitions

  • the invention relates to a pressure switch with a pressure chamber acted upon by the pressure medium to be measured and a plunger actuating a switching pin of a microswitch.
  • pressure switches are generally known and used.
  • the switching point of pressure switches of this type is higher due to the design when the pressure builds up than when the pressure is reduced, since the switching pin must first cover a differential path after reaching the switching point when the pressure builds up and then decreases before the so-called switch-back point is reached.
  • This hysteresis can be used for example in a pressure control with such a pressure switch. If, for example, a pressure between 130 and 160 bar is to be maintained in a container, then a pressure switch can be selected, the microswitch of which switches off a pressure-generating pump when the pressure rises at 160 bar and switches back at 130 bar when the pressure falls, so that the Pump starts to work again.
  • microswitches with the respectively desired, precise switching points must be sorted out from a larger number of manufactured microswitches.
  • the microswitch required for a certain hysteresis of the pressure switch must be selected. Therefore, pressure switches with a fixed switch-on and switch-off point are considerably more expensive than pressure switches with only one set switching point.
  • the invention has for its object to design a pressure switch of the type mentioned in such a way that not only the area between the switch-on point and the switch-back point as a whole is shifted, but also the mutual distance between these points can be changed.
  • This object is achieved in that a rocker arm is arranged between the switching pin and the plunger, against which from one side of the plunger and from the opposite side of the switching pin and that the microswitch with its switching pin can be moved transversely to the plunger in the longitudinal direction of the rocker arm is arranged.
  • This interposition of a rocker arm between the plunger of the pressure switch and the switching pin of the microswitch translates the pressure-dependent, axial displacement of the switching pin in accordance with the lever ratios of the rocker arm.
  • This gear ratio can be changed by the displaceability of the microswitch. This makes it possible to change the distance between the switch-on point of the microswitch and the switch-back point, so that the differential path between the switch pin positions does not only shift due to the spring when switching, but also reduces it nern or enlarge.
  • microswitches with rough tolerances can be used for the pressure switch according to the invention and the exact switching points set in each case.
  • a particularly large change in the transmission ratio between the displacement of the plunger and the switching pin can be achieved if the rocker arm is articulated on a side of the housing of the microswitch lying in the displacement direction of the rocker arm.
  • This great possibility of changing the gear ratio results from the fact that the pivot axis of the rocker arm can be pushed close to the plunger by moving the microswitch, so that small tappet displacements lead to a strong pivoting of the rocker arm.
  • the axial displacement of the plunger can be optionally translated or reduced if the microswitch is designed to be displaceable in two opposite directions from a position aligned with its plunger to the plunger.
  • the microswitch can be moved in very different ways. A particularly sensitive displacement of the microswitch is possible if the microswitch rests with its back against a wall surface and by means of at least one fastening screw leading through an elongated hole in the wall surface with a slide piece arranged behind the wall surface in a bore running in the direction of displacement is connected and if further means are provided for sensitive displacement of the slider with the fastening screw loosened.
  • the means for adjusting the slider can also be designed very differently.
  • the slide could be designed as a toothed rack and a pinion engaging in this toothed rack could be provided to move the slide.
  • the slider can be moved particularly easily if, according to another embodiment of the invention, it engages with part of its lateral surface in a bore running transversely to the direction of displacement for inserting an adjusting tool.
  • a toothing on the sliding piece can be dispensed with entirely if the sliding piece consists of a material that is soft in comparison to the adjusting tool and the adjusting tool is a screwdriver with multiple teeth.
  • the pressure switch according to the invention has a housing 1 with a threaded connector 2 for screwing into a threaded bore (not shown) of the component to which it is to be attached.
  • a coaxial bore 3 is provided in the threaded connector 2, through which the pressure medium to be measured can get into a pressure chamber 4 up to the end face of a stamp 5.
  • This stamp 5 is sealed by means of a seal 6 to the housing 1, so that pressurization of the pressure chamber 4 leads to a displacement of the stamp 5 as seen in the drawing to the right.
  • the stamp 5 lies against a plunger 7, which rests with its opposite side against a pivotable about an axis 8, transverse to the plunger 7 rocker arm 9.
  • An actuating spring 10 biases the plunger in the direction of the plunger 5, for which purpose it is supported against a screw piece 11 which can be screwed into the housing 1 to a greater or lesser extent in order to change the clamping force of the actuating spring 10.
  • the rocker arm 9 is fastened with its axis 8 to the housing of a microswitch 12.
  • This microswitch 12 has a switching pin 13 which bears on the side facing the microswitch 12 against the rocker arm 9 and is aligned with the plunger 7 in the position shown. It is essential for the invention that the microswitch 12 is attached to the housing 1 such that it can be moved transversely to the plunger 7. For this purpose, it is held against a wall surface 16 of the housing 1 by means of two fastening screws 14, 15 in a manner still to be explained.
  • Figure 2 illustrates the design of the pressure switch. It can be seen how the microswitch 12 bears against the wall surface 16 with the fastening screws 14, 15. Furthermore, an end-side bore 17 can be seen, in which part of the outer surface of a cylindrical slide 18 can be seen.
  • FIG 3 shows that this slider 18 is slidably disposed in a bore 19 and the mounting screws 14, 15 are screwed through the microswitch 12 into this slider 18.
  • An elongated hole (not shown) in the wall surface 16 enables the microswitch 12 to be moved together with the slider 18, provided that the fastening screws 14, 15 are not tightened.
  • a screwdriver 20 which has a cone 21 with multiple toothing 22 at its lower end, is used for the sensitive displacement of the sliding piece 18.
  • This screwdriver 20 is inserted into the bore 17 so that its multiple toothing 22 sits on the outer surface of the slider 18. Since the slider 18 should consist of a softer material than the multiple toothing 22, this presses into the outer surface of the slider 18, so that it can be moved by turning the screwdriver 20 as if it were a rack-like teeth. In practice, one moves the slider 18 and thus the microswitch 12 so far and in such a direction that the differential path of the pressure switch is of the required size.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Press Drives And Press Lines (AREA)
  • Braking Systems And Boosters (AREA)
EP88104525A 1987-03-31 1988-03-22 Pressostat Expired - Lifetime EP0284948B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104525T ATE84909T1 (de) 1987-03-31 1988-03-22 Druckschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3710645 1987-03-31
DE19873710645 DE3710645A1 (de) 1987-03-31 1987-03-31 Druckschalter

Publications (3)

Publication Number Publication Date
EP0284948A2 true EP0284948A2 (fr) 1988-10-05
EP0284948A3 EP0284948A3 (en) 1989-07-26
EP0284948B1 EP0284948B1 (fr) 1993-01-20

Family

ID=6324437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104525A Expired - Lifetime EP0284948B1 (fr) 1987-03-31 1988-03-22 Pressostat

Country Status (4)

Country Link
US (1) US4827093A (fr)
EP (1) EP0284948B1 (fr)
AT (1) ATE84909T1 (fr)
DE (2) DE3710645A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3819459A1 (de) * 1988-06-08 1989-12-14 Festo Kg Druckgesteuerte elektrische schalteinheit
FR2638888A1 (fr) * 1988-11-09 1990-05-11 Crouzet Sa Dispositif perfectionne de commutation electrique
DE3910837A1 (de) * 1989-04-04 1990-10-11 Imo Ind Gmbh Elektrische schalteinrichtung
JP2857173B2 (ja) * 1989-08-11 1999-02-10 自動車機器株式会社 温度依存性圧力検出スイッチ及びその圧力検出スイッチを用いた液圧制御システム
US5136128A (en) * 1991-01-11 1992-08-04 Teledyne Industries, Inc. Hydraulically-piloted switch
JP3916684B2 (ja) * 1995-12-27 2007-05-16 カヤバ工業株式会社 油圧ポンプの圧力スイッチ
US6722736B2 (en) * 2002-02-21 2004-04-20 Hickory Springs Manufacturing Company Movable switch for a motorized recliner
EP1362722A1 (fr) * 2002-05-14 2003-11-19 Ford Global Technologies, Inc., A subsidiary of Ford Motor Company Système de connection pour appareil de climatisation de véhicule
JP3722287B2 (ja) * 2002-06-11 2005-11-30 アサ電子工業株式会社 リミットスイッチ
ITRE20030092A1 (it) * 2003-09-30 2005-04-01 Arrow Line Srl Pressostato a corsa smorzata.
US7605336B2 (en) * 2007-08-30 2009-10-20 Honeywell International Inc. Pressure switch with adjustable differental setting
EP2528429B1 (fr) 2010-01-29 2017-11-08 GEA Houle Inc. Station de traite rotative, kit permettant d'assembler cette dernière et procédé d'assemblage associé
CN106783262B (zh) * 2015-11-24 2018-07-06 西安航空动力控制科技有限公司 一种微动开关控制装置
US11915896B2 (en) 2021-07-22 2024-02-27 Eaton Intelligent Power Limited Pressure switch piston

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268340A (en) * 1940-10-18 1941-12-30 Evarts G Loomis Fluid pressure control device
FR1250613A (fr) * 1959-12-02 1961-01-13 Olaer Patent Co Perfectionnements aux appareils permettant de contrôler un appareillage électriquepar la pression d'un fluide
DE1448292B1 (de) * 1961-10-26 1970-08-27 Otto Dold Regelvorrichtung
DE1640360B1 (de) * 1966-12-14 1972-01-20 Herion Werke Kg Elektrischer Druckdifferenzschalter
DE3311083A1 (de) * 1983-03-26 1984-09-27 Alfred Teves Gmbh, 6000 Frankfurt Vorrichtung zum schalten eines stromkreises in abhaengigkeit eines hydraulischen drucks

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE216131C (fr) *
FR882291A (fr) * 1941-05-31 1943-05-28 Stotz Kontakt Gmbh Interrupteur de feu d'arrêt d'automobile
US3449535A (en) * 1966-08-01 1969-06-10 Essex Mfg Co Inc Fluid operated switch
DE2201973C3 (de) * 1972-01-17 1978-05-24 Teves Gmbh Alfred Totganggetriebe'für einen elektrischen Schalter
US3937912A (en) * 1974-09-30 1976-02-10 Martin Industries, Inc. Pressure responsive circuit control unit having adjustable, interchangeable actuator components and cam-operated switch
DE7913018U1 (de) * 1979-05-05 1979-09-20 Robert Scheuffele & Co Armaturen U. Apparate, 7120 Bissingen Druckschalter in explosionssicherer Ausführung
DE3202512C2 (de) * 1982-01-27 1985-02-28 Willi 7120 Bietigheim-Bissingen Quitoschinger Druckgesteuerter elektrischer Schalter
DD216131A1 (de) * 1983-06-14 1984-11-28 Pirna Fahrzeugelektrik Kontaktwippenanordnung in hydraulisch betaetigten schaltern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268340A (en) * 1940-10-18 1941-12-30 Evarts G Loomis Fluid pressure control device
FR1250613A (fr) * 1959-12-02 1961-01-13 Olaer Patent Co Perfectionnements aux appareils permettant de contrôler un appareillage électriquepar la pression d'un fluide
DE1448292B1 (de) * 1961-10-26 1970-08-27 Otto Dold Regelvorrichtung
DE1640360B1 (de) * 1966-12-14 1972-01-20 Herion Werke Kg Elektrischer Druckdifferenzschalter
DE3311083A1 (de) * 1983-03-26 1984-09-27 Alfred Teves Gmbh, 6000 Frankfurt Vorrichtung zum schalten eines stromkreises in abhaengigkeit eines hydraulischen drucks

Also Published As

Publication number Publication date
DE3877603D1 (de) 1993-03-04
EP0284948B1 (fr) 1993-01-20
ATE84909T1 (de) 1993-02-15
US4827093A (en) 1989-05-02
EP0284948A3 (en) 1989-07-26
DE3710645A1 (de) 1988-10-20

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