EP0284948A2 - Pressure switch - Google Patents

Pressure switch Download PDF

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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)
French (fr)
Other versions
EP0284948A3 (en
EP0284948B1 (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/en
Publication of EP0284948A2 publication Critical patent/EP0284948A2/en
Publication of EP0284948A3 publication Critical patent/EP0284948A3/en
Application granted granted Critical
Publication of EP0284948B1 publication Critical patent/EP0284948B1/en
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.

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  • 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)

Abstract

A pressure switch has a plunger, axially displaceable by the pressure being measured, which enables a contact pin of a microswitch to be actuated. Between the plunger and the contact pin there is arranged a rocker. The microswitch is fastened to the housing of the pressure switch so as to be displaceable in the main extension direction of the rocker. This provides a way to vary the step-up ratio between the plunger motion and the contact-pin motion, whereby the magnitude of the hysteresis of the pressure switch can be varied.

Description

Die Erfindung bezieht sich auf einen Druckschalter mit einer vom zu messenden Druckmedium beaufschlagten Druck­kammer und einem einen Schaltstift eines Mikroschalters betätigenden Stößel. Solche Druckschalter sind allgemein bekannt und gebräuchlich.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. Such pressure switches are generally known and used.

Der Schaltpunkt von Druckschaltern dieser Art liegt kon­struktionsbedingt bei einem Druckaufbau höher als bei einem Druckabbau, da der Schaltstift nach Erreichen des Schaltpunktes bei Druckaufbau und anschließendem Druckab­bau zunächst einen Differenzweg zurücklegen muß, bevor der sogenannte Rückschaltpunkt erreicht ist. Diese Hyste­rese kann man sich beispielsweise bei einer Drucksteue­rung mit einem solchen Druckschalter zunutze machen. Wenn zum Beispiel in einem Behälter ein Druck zwischen 130 und 160 bar aufrechterhalten werden soll, dann kann man einen Druckschalter wählen, dessen Mikroschalter bei steigendem Druck bei 160 bar eine den Druck erzeugende Pumpe abschaltet und bei fallendem Druck bei 130 bar zurückschaltet, so daß die Pumpe wieder zu arbeiten beginnt.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.

Wenn man bei Mikroschaltern eine hohe Genauigkeit der Schaltpunkte für steigenden und fallenden Druck ver­langt, dann müssen die Mikroschalter mit den jeweils gewünschten, genauen Schaltpunkten aus einer größeren Anzahl von gefertigten Mikroschaltern aussortiert wer­den. Zusätzlich muß nach dem Zusammenbau des Druckschal­ters auf dem Prüfstand der für eine bestimmte Hysterese des Druckschalters erforderliche Mikroschalter ausge­sucht werden. Deshalb sind Druckschalter mit festgeleg­tem Ein- und Ausschaltpunkt wesentlich teurer als Druck­ schalter mit nur einem festgelegten Schaltpunkt.If a high degree of accuracy of the switching points for rising and falling pressure is required for microswitches, then the microswitches with the respectively desired, precise switching points must be sorted out from a larger number of manufactured microswitches. In addition, after assembling the pressure switch on the test bench, 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.

Das Aussortieren geeigneter Mikroschalter für die Druck­schalter kann man auch nicht dadurch vermeiden, daß man durch Verändern der Federkraft ihrer ihren Stößel entge­gen der Schaltrichtung vorspannenden Stellfeder den Be­reich der Schaltpunkte nach oben oder unten verschiebt, weil diese Einstellmöglichkeit für viele Anwendungsfälle nicht ausreicht, denn oftmals ist infolge von Toleranzen der Bereich zwischen Einschaltpunkt und Rückschaltpunkt größer oder kleiner als erforderlich.The sorting out of suitable microswitches for the pressure switches cannot be avoided by moving the range of the switching points up or down by changing the spring force of their actuating spring counter to the switching direction, because this setting option is not sufficient for many applications, because it is often necessary due to tolerances, the area between switch-on point and switch-back point is larger or smaller than required.

Der Erfindung liegt die Aufgabe zugrunde, einen Druck­schalter der eingangs genannten Art derart zu gestalten, daß nicht nur der Bereich zwischen Einschaltpunkt und Rückschaltpunkt als Ganzes verschoben, sondern auch der gegenseitige Abstand dieser Punkte veränderbar ist.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.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen dem Schaltstift und dem Stößel ein Kipphebel angeordnet ist, gegen den von einer Seite der Stößel und von der gegenüberliegenden Seite der Schaltstift anlie­gen und daß der Mikroschalter mit seinem Schaltstift quer zu dem Stößel in Längserstreckungsrichtung des Kipp­hebels verschiebbar angeordnet ist.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.

Durch diese Zwischenschaltung eines Kipphebels zwischen dem Stößel des Druckschalters und dem Schaltstift des Mikroschalters wird die druckabhängige, axiale Verschie­bung des Schaltstiftes entsprechend den Hebelverhält­nissen des Kipphebels übersetzt. Durch die Verschiebbar­keit des Mikroschalters läßt sich dieses Übersetzungs­verhältnis verändern. Dadurch wird es möglich, den Abstand des Einschaltpunktes des Mikroschalters vom Rück­schaltpunkt zu verändern, so daß sich der Differenzweg zwischen den Schaltstiftstellungen beim Schalten nicht nur durch die Stellfeder verschieben, sondern verklei­ nern oder vergrößern läßt. Dadurch kann man für den erfindungsgemäßen Druckschalter Mikroschalter mit groben Toleranzen verwenden und die genauen Schaltpunkte je­weils einstellen.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. As a result, microswitches with rough tolerances can be used for the pressure switch according to the invention and the exact switching points set in each case.

Um beim Verschieben des Mikroschalters nicht zwangsläu­fig zugleich den Stößel und den Schaltstift axial zu verschieben, ist es zweckmäßig, wenn der Kipphebel quer zum Stößel in Verschieberichtung des Mikroschalters aus­gerichtet ist.In order not to necessarily simultaneously move the plunger and the switching pin axially when the microswitch is moved, it is expedient if the rocker arm is aligned transversely to the plunger in the direction of displacement of the microswitch.

Eine besonders große Veränderung des Übersetzungsverhält­nisses zwischen der Verschiebung des Stößels und des Schaltstiftes läßt sich erreichen, wenn der Kipphebel an einer in Verschieberichtung des Kipphebels liegenden Seite des Gehäuses des Mikroschalters angelenkt ist. Diese große Veränderungsmöglichkeit des Übersetzungs­verhältnisses resuliert daraus, daß durch Verschieben des Mikroschalters die Schwenkachse des Kipphebels bis nahe über den Stößel geschoben werden kann, so daß ge­ringe Stößelverschiebungen zu einer starken Verschwen­kung des Kipphebels führen.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.

Die axiale Verschiebung des Stößels läßt sich wahlweise übersetzen oder untersetzen, wenn der Mikroschalter aus einer mit seinem Schaltstift zum Stößel fluchtenden Stel­lung in zwei entgegengesetzte Richtungen verschiebbar ausgebildet ist.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.

Die Verschiebbarkeit des Mikroschalters kann auf sehr unterschiedliche Weise erreicht werden. Ein besonders feinfühliges Verschieben des Mikroschalters ist möglich, wenn der Mikroschalter mit seiner Rückseite gegen eine Wandfläche anliegt und mittels zumindest einer durch ein Langloch in der Wandfläche führenden Befestigungsschrau­be mit einem in einer in Verschieberichtung verlaufenden Bohrung hinter der Wandfläche angeordneten Gleitstück verbunden ist und wenn ferner Mittel zum feinfühligen Verschieben des Gleitstückes bei gelockerter Befesti­gungsschraube vorgesehen sind.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.

Auch die Mittel zur Verstellung des Gleitstückes können sehr unterschiedlich gestaltet sein. Man könnte zum Beispiel das Gleitstück als Zahnstange ausbilden und zum Verschieben des Gleitstückes ein in diese Zahnstange greifendes Ritzel vorsehen. Besonders einfach läßt sich das Gleitstück verschieben, wenn es gemäß einer anderen Ausgestaltung der Erfindung mit einem Teil seiner Mantel­fläche in eine quer zur Verschieberichtung verlaufenden Bohrung zum Einsetzen eines Verstellwerkzeuges greift.The means for adjusting the slider can also be designed very differently. For example, 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.

Auf eine Verzahnung am Gleitstück kann gänzlich verzich­tet werden, wenn das Gleitstück aus einem im Vergleich zum Verstellwerkzeug weichen Werkstoff besteht und das Verstellwerkzeug ein Schrauber mit einer Mehrfachver­zahnung ist.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.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist in der Zeichnung dargestellt und wird nach­folgend beschrieben. In ihr zeigen die

  • Fig. 1 einen Längsschnitt durch einen erfindungs­gemäßen Druckschalter,
  • Fig. 2 eine Vorderansicht des Druckschalters,
  • Fig. 3 eine gegenüber den vorangegangenen Figuren vergrößerte Schnittdarstellung durch den Druckschalter im Bereich der Befestigung seines Mikroschalters.
The invention allows numerous embodiments. One of them is shown in the drawing and is described below. They show in her
  • 1 shows a longitudinal section through a pressure switch according to the invention,
  • 2 is a front view of the pressure switch,
  • Fig. 3 is an enlarged sectional view compared to the previous figures through the pressure switch in the area of the attachment of its microswitch.

Wie die Figur 1 erkennen läßt, hat der erfindungsgemäße Druckschalter ein Gehäuse 1 mit einem Gewindestutzen 2 zum Einschrauben in eine nicht dargestellte Gewinde­bohrung des Bauteils, an dem er angebracht werden soll. Im Gewindestutzen 2 ist eine koaxiale Bohrung 3 vorge­sehen, durch die das zu messende Druckmedium in einen Druckraum 4 bis vor die Stirnfläche eines Stempels 5 gelangen kann. Dieser Stempel 5 ist mittels einer Dich­tung 6 zum Gehäuse 1 hin abgedichtet, so daß eine Druck­beaufschlagung des Druckraumes 4 zu einer Verschiebung des Stempels 5 in der Zeichnung gesehen nach rechts führt. Der Stempel 5 legt sich dabei gegen einen Stößel 7, der mit seiner gegenüberliegenden Seite gegen einen um eine Achse 8 schwenkbaren, quer zum Stößel 7 ausge­richteten Kipphebel 9 anliegt.As can be seen in FIG. 1, 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.

Eine Stellfeder 10 spannt den Stößel in Richtung des Stempels 5 vor, wozu sie gegen ein Schraubstück 11 abge­stützt ist, welches zur Veränderung der Spannkraft der Stellfeder 10 mehr oder weniger weit in das Gehäuse 1 eingeschraubt werden kann.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.

Der Kipphebel 9 ist mit seiner Achse 8 am Gehäuse eines Mikroschalters 12 befestigt. Dieser Mikroschalter 12 hat einen Schaltstift 13, welcher auf der dem Mikroschalter 12 zugewandten Seite gegen den Kipphebel 9 anliegt und in der dargestellten Stellung mit dem Stößel 7 fluchtet. Für die Erfindung wesentlich ist, daß der Mikroschalter 12 quer zum Stößel 7 verschiebbar auf dem Gehäuse 1 befestigt ist. Zu diesem Zweck ist er mittels zweier Befestigungsschrauben 14, 15 auf noch zu erläuternde Weise gegen eine Wandfläche 16 des Gehäuses 1 gehalten. Löst man diese Befestigungsschrauben 14, 15 und schiebt den Mikroschalter 12 in der Zeichnung gesehen nach unten, dann drückt der Stößel 7 näher zur Achse 8 gegen den Kipphebel 9 als in der dargestellten Mittelstellung. Eine geringe axiale Verschiebung des Stößels 7 führt dadurch zu einer relativ starken Schwenkbewegung des Kipphebels 9 und damit zu einer entsprechend großen Ver­schiebung des Schaltstiftes 13, so daß es früher zu einem Schalten kommt.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. If you loosen these fastening screws 14, 15 and slide the microswitch 12 as seen in the drawing downward, then the plunger 7 presses closer to the axis 8 against the rocker arm 9 than in the middle position shown. A slight axial displacement of the plunger 7 leads thereby to a relatively strong pivoting movement of the rocker arm 9 and thus to a correspondingly large displacement of the switching pin 13, so that switching occurs earlier.

Verschiebt man den Mikroschalter 12 in der Zeichnung gesehen nach oben, so tritt eine Weguntersetzung ein. Der Stößel 7 muß sich relativ weit axial verschieben, um eine geringe Verschiebung des Schaltstiftes 13 zu be­wirken.Moving the microswitch 12 as seen in the drawing upwards, a step-down ratio occurs. The plunger 7 has to move axially relatively far in order to cause a slight displacement of the switching pin 13.

Die Figur 2 verdeutlicht die Gestaltung des Druckschal­ters. Zu erkennen ist, wie der Mikroschalter 12 mit den Befestigungsschrauben 14, 15 gegen die Wandfläche 16 anliegt. Weiterhin ist eine stirnseitige Bohrung 17 zu sehen, in der man einen Teil der Mantelfläche eines zylindrischen Gleitstückes 18 erkennt.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.

Die Figur 3 zeigt, daß dieses Gleitstück 18 in einer Bohrung 19 verschieblich angeordnet ist und die Befesti­gungsschrauben 14, 15 durch den Mikroschalter 12 hin­durch in dieses Gleitstück 18 geschraubt sind. Ein nicht dargestelltes Langloch in der Wandfläche 16 ermöglicht eine Verschiebung des Mikroschalters 12 zusammen mit dem Gleitstück 18, sofern die Befestigungsschrauben 14, 15 nicht festgezogen sind.Figure 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.

Zur feinfühligen Verschiebung des Gleitstückes 18 dient ein Schrauber 20, der an seinem unteren Ende einen Kegel 21 mit einer Mehrfachverzahnung 22 aufweist. Diesen Schrauber 20 steckt man in die Bohrung 17, so daß sich seine Mehrfachverzahnung 22 auf die Mantelfläche des Gleitstückes 18 setzt. Da das Gleitstück 18 aus einem weicheren Werkstoff bestehen soll als die Mehrfachver­zahnung 22, drückt sich diese in die Mantelfläche des Gleitstückes 18 ein, so daß dieses durch Drehen des Schraubers 20 so verschoben werden kann, als ob es eine zahnstangenartige Verzahnung hätte. Man verschiebt in der Praxis das Gleitstück 18 und damit den Mikroschalter 12 so weit und in eine solche Richtung, bis daß der Differenzweg des Druckschalters die erforderliche Größe aufweist.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.

Auflistung der verwendeten BezugszeichenList of the reference symbols used

1 Gehäuse
2 Gewindestutzen
3 Bohrung
4 Druckraum
5 Stempel

6 Dichtung
7 Stößel
8 Achse
9 Kipphebel
10 Stellfeder

11 Schraubstück
12 Mikroschalter
13 Schaltstift
14 Befestigungsschraube
15 Befestigungsschraube

16 Wandfläche
17 Bohrung
18 Gleitstück
19 Bohrung
20 Schraube

21 Kegel
22 Mehrfachverzahnung
1 housing
2 threaded connectors
3 hole
4 pressure room
5 stamps

6 seal
7 pestles
8 axis
9 rocker arms
10 spring

11 screw
12 microswitches
13 switching pin
14 fastening screw
15 fastening screw

16 wall surface
17 hole
18 slider
19 hole
20 screw

21 cones
22 Multiple teeth

Claims (7)

1. Druckschalter mit einer vom zu messenden Druckmedium beaufschlagten Druckkammer und einem einen Schaltstift eines Mikroschalters betätigenden Stößel, dadurch ge­kennzeichnet, daß zwischen dem Schaltstift (13) und dem Stößel (7) ein Kipphebel (9) angeordnet ist, gegen den von einer Seite der Stößel (7) und von der gegenüber­liegenden Seite der Schaltstift (13) anliegen und daß der Mikroschalter (12) mit seinem Schaltstift (13) quer zu dem Stößel (7) in Längserstreckungsrichtung des Kipp­hebels (9) verschiebbar angeordnet ist.1. 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, characterized in that a rocker arm (9) is arranged between the switching pin (13) and the plunger (7), against which one side of the Tappet (7) and from the opposite side of the switching pin (13) and that the microswitch (12) with its switching pin (13) is arranged transversely to the plunger (7) in the longitudinal direction of the rocker arm (9). 2. Druckschalter nach Anspruch 1, dadurch gekennzeich­net, daß der Kipphebel (9) quer zum Stößel (7) in Ver­schieberichtung des Mikroschalters (12) ausgerichtet ist.2. Pressure switch according to claim 1, characterized in that the rocker arm (9) is aligned transversely to the plunger (7) in the direction of displacement of the microswitch (12). 3. Druckschalter nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Kipphebel (9) an einer in Ver­schieberichtung des Kipphebels (9) liegenden Seite des Gehäuses (1) des Mikroschalters (12) angelenkt ist.3. Pressure switch according to claims 1 or 2, characterized in that the rocker arm (9) on a in the displacement direction of the rocker arm (9) lying side of the housing (1) of the microswitch (12) is articulated. 4. Druckschalter nach einem oder mehreren der vorangehen­den Ansprüche, dadurch gekennzeichnet, daß der Mikro­schalter (12) aus einer mit seinem Schaltstift (13) zum Stößel (7) fluchtenden Stellung in zwei entgegengesetzte Richtungen verschiebbar ausgebildet ist.4. Pressure switch according to one or more of the preceding claims, characterized in that the microswitch (12) from one with its switching pin (13) to the plunger (7) aligned position is designed to be displaceable in two opposite directions. 5. Druckschalter nach einem oder mehreren der vorangehen­den Ansprüche, dadurch gekennzeichnet, daß der Mikro­schalterm (12) mit seiner Rückseite gegen eine Wandfläche (16) anliegt und mittels zumindest einer durch ein Lang­loch in der Wandfläche (16) führenden Befestigungs­schraube (14, 15) mit einem in einer in Verschieberich­tung verlaufenden Bohrung (19) hinter der Wandfläche (16) angeordneten Gleitstück (18) verbunden ist und daß ferner Mittel zum feinfühligen Verschieben des Gleit­stückes (18) bei gelockerter Befestigungsschraube (14, 15) vorgesehen sind.5. Pressure switch according to one or more of the preceding claims, characterized in that the microswitch (12) rests with its rear side against a wall surface (16) and by means of at least one fastening screw (14, 15) leading through an elongated hole in the wall surface (16). is connected to a slide (18) arranged in a bore (19) running in the direction of displacement behind the wall surface (16) and that furthermore, means are provided for the sensitive displacement of the slide (18) when the fastening screw (14, 15) is loosened. 6. Druckschalter nach Anspruch 4, dadurch gekennzeich­net, daß das Gleitstück (18) mit einem Teil seiner Man­telfläche in eine quer zur Verschieberichtung verlaufen­den Bohrung (17) zum Einsetzen eines Verstellwerkzeuges (Schrauber 20) greift.6. Pressure switch according to claim 4, characterized in that the slider (18) engages with a part of its lateral surface in a transverse to the displacement direction bore (17) for inserting an adjusting tool (screwdriver 20). 7. Druckschalter nach einem oder mehreren der vorangehen­den Ansprüche, dadurch gekennzeichnet, daß das Gleit­stück (18) aus einem im Vergleich zum Verstellwerkzeug (20) weichen Werkstoff besteht und das Verstellwerkzeug ein Schrauber (20) mit einer Mehrfachverzahnung (22) ist.7. Pressure switch according to one or more of the preceding claims, characterized in that the slider (18) consists of a soft material in comparison to the adjusting tool (20) and the adjusting tool is a screwdriver (20) with multiple teeth (22).
EP88104525A 1987-03-31 1988-03-22 Pressure switch Expired - Lifetime EP0284948B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104525T ATE84909T1 (en) 1987-03-31 1988-03-22 PRESSURE SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3710645 1987-03-31
DE19873710645 DE3710645A1 (en) 1987-03-31 1987-03-31 PRESSURE SWITCH

Publications (3)

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

Family

ID=6324437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104525A Expired - Lifetime EP0284948B1 (en) 1987-03-31 1988-03-22 Pressure switch

Country Status (4)

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

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DE3819459A1 (en) * 1988-06-08 1989-12-14 Festo Kg Pressure-controlled electrical switching unit
FR2638888A1 (en) * 1988-11-09 1990-05-11 Crouzet Sa IMPROVED ELECTRICAL SWITCHING DEVICE
DE3910837A1 (en) * 1989-04-04 1990-10-11 Imo Ind Gmbh ELECTRICAL SWITCHING DEVICE
JP2857173B2 (en) * 1989-08-11 1999-02-10 自動車機器株式会社 Temperature dependent pressure detection switch and hydraulic control system using the pressure detection switch
US5136128A (en) * 1991-01-11 1992-08-04 Teledyne Industries, Inc. Hydraulically-piloted switch
JP3916684B2 (en) * 1995-12-27 2007-05-16 カヤバ工業株式会社 Hydraulic pump pressure switch
US6722736B2 (en) * 2002-02-21 2004-04-20 Hickory Springs Manufacturing Company Movable switch for a motorized recliner
EP1362722A1 (en) * 2002-05-14 2003-11-19 Ford Global Technologies, Inc., A subsidiary of Ford Motor Company Connection system for an automotive air condition device
JP3722287B2 (en) * 2002-06-11 2005-11-30 アサ電子工業株式会社 Limit switch
ITRE20030092A1 (en) * 2003-09-30 2005-04-01 Arrow Line Srl DAMPENED PRESSURE SWITCH.
US7605336B2 (en) * 2007-08-30 2009-10-20 Honeywell International Inc. Pressure switch with adjustable differental setting
EP2528429B1 (en) 2010-01-29 2017-11-08 GEA Houle Inc. Rotary milking station, kit for assembling the same, and method of assembling associated thereto
CN106783262B (en) * 2015-11-24 2018-07-06 西安航空动力控制科技有限公司 A kind of microswitch controlling device
EP4123678B1 (en) 2021-07-22 2024-05-15 Eaton Intelligent Power Limited Pressure switch with a piston

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US2268340A (en) * 1940-10-18 1941-12-30 Evarts G Loomis Fluid pressure control device
FR1250613A (en) * 1959-12-02 1961-01-13 Olaer Patent Co Improvements to devices for controlling electrical equipment by the pressure of a fluid
DE1448292B1 (en) * 1961-10-26 1970-08-27 Otto Dold Control device
DE1640360B1 (en) * 1966-12-14 1972-01-20 Herion Werke Kg Electrical differential pressure switch
DE3311083A1 (en) * 1983-03-26 1984-09-27 Alfred Teves Gmbh, 6000 Frankfurt Device for switching a circuit as a function of a hydraulic pressure

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US3449535A (en) * 1966-08-01 1969-06-10 Essex Mfg Co Inc Fluid operated switch
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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 (en) * 1979-05-05 1979-09-20 Robert Scheuffele & Co Armaturen U. Apparate, 7120 Bissingen Pressure switch in explosion-proof design
DE3202512C2 (en) * 1982-01-27 1985-02-28 Willi 7120 Bietigheim-Bissingen Quitoschinger Pressure controlled electrical switch
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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 (en) * 1959-12-02 1961-01-13 Olaer Patent Co Improvements to devices for controlling electrical equipment by the pressure of a fluid
DE1448292B1 (en) * 1961-10-26 1970-08-27 Otto Dold Control device
DE1640360B1 (en) * 1966-12-14 1972-01-20 Herion Werke Kg Electrical differential pressure switch
DE3311083A1 (en) * 1983-03-26 1984-09-27 Alfred Teves Gmbh, 6000 Frankfurt Device for switching a circuit as a function of a hydraulic pressure

Also Published As

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

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