EP0328926B1 - Pressure switch - Google Patents

Pressure switch Download PDF

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Publication number
EP0328926B1
EP0328926B1 EP89101594A EP89101594A EP0328926B1 EP 0328926 B1 EP0328926 B1 EP 0328926B1 EP 89101594 A EP89101594 A EP 89101594A EP 89101594 A EP89101594 A EP 89101594A EP 0328926 B1 EP0328926 B1 EP 0328926B1
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EP
European Patent Office
Prior art keywords
switching
spring
switch housing
pressure
screwed
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.)
Expired - Lifetime
Application number
EP89101594A
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German (de)
French (fr)
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EP0328926A3 (en
EP0328926A2 (en
Inventor
Kuno Skach
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Knorr Bremse AG
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Knorr Bremse AG
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Publication date
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Publication of EP0328926A2 publication Critical patent/EP0328926A2/en
Publication of EP0328926A3 publication Critical patent/EP0328926A3/en
Application granted granted Critical
Publication of EP0328926B1 publication Critical patent/EP0328926B1/en
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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
    • H01H35/2635—Means for adjustment of "ON" or "OFF" operating pressure by adjustment of a motion transmitting system
    • 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
    • H01H35/2614—Means for adjustment of "ON" or "OFF" operating pressure by varying the bias on the pressure sensitive element

Definitions

  • the invention relates to a pressure switch according to the preamble of claim 1.
  • two clutch plates carrying individual stops are provided, of which at least one is positively connected by means of a driver element with a hysteresis adjusting element rotatably mounted in the pressure switch housing, such that the axial distance between the two single stops
  • the purpose of adjusting the hysteresis is changeable.
  • An adjusting screw for the first adjustment screw connection is rotatably mounted in the hysteresis adjusting element, i.e. that a twisting of the adjusting screw can inadvertently lead to a twisting of the hysteresis adjusting element and thus to an actuation of the second adjusting screw.
  • a jamming of the control element when turning is also not excluded.
  • the object of the invention is to design a pressure switch of the type in question so that incorrect settings caused by the double function of the hysteresis adjusting element can be avoided; also Incorrect settings caused by jams should be excluded.
  • the pressure switch has two structurally completely separate adjusting screw connections for separately adjusting the preload of the control spring and thus the switching pressure on the one hand and the axial distance between the individual stops and thus the switching hysteresis on the other hand, the adjustment of the axial distance of the individual stops being limited by the stroke limitation of the threaded sleeve without jamming .
  • the pressure switch has a switch housing 1, which contains a cylinder section 2, in which a switching piston 3 is displaceably guided in a sealed manner.
  • the switching piston 3 On the other hand, the switching piston 3 is adjoined by a spring chamber 6 which is subjected to atmospheric pressure and in which there is a control spring 7 which may be composed of a plurality of individual springs.
  • the control spring 7, which is coaxial with the switching piston 3, rests on the switching piston side on a spring plate 8 which is supported against the switching piston 3 via a ball 9 to compensate for spring irregularities.
  • the control spring 7 is supported against a spring plate 10, which engages in a longitudinal slot 12 of the switch housing 1 by means of a radially projecting nose 11 and is thus guided in a non-rotatable manner axially.
  • the spring plate 10 is screwed centrically to a threaded spindle 13 which is axially immovable and rotatably supported against the switch housing 1 in the effective direction of the control spring 7 by means of an annular flange 14.
  • the threaded spindle 13 passes through a wall of the switch housing 1 with a cylindrical section and ends outdoors with a hexagon section 15.
  • the hexagon section 15 is penetrated by transverse bores 16, through which a sealing wire 17 is guided, which is fixed to the switch housing 1 by means of a holder 18 .
  • the switching piston 3 carries a plunger 20 which extends through the pressurizing chamber 4 and, with a cylindrical section 21, slidably penetrates a wall 22 of the switch housing 1 delimiting the pressurizing chamber 4.
  • the section 23 is connected to the individual stop 24 for screwing it into the section 21 with a profile surface section 25, which is followed by a threaded section 26 which forms the end of the plunger 20.
  • a nut 27 is adjustably screwed to the threaded section 26, one end face of which forms a second individual stop 28 which is spaced apart from the individual stop 24.
  • the outer circumferential surface of the nut 27 is formed to form axially parallel profile surfaces, with which the nut 27 is guided on corresponding inner profile surfaces 29 in a recess 30 of a threaded sleeve 31 surrounding the nut 27 so as to be non-rotatable but axially displaceable.
  • the profile surface section 25 of the plunger 20 can be partially immersed in a recess in the nut 27 that surrounds it with play and enables relative rotations between the section 23 and the nut 27.
  • the threaded sleeve 31 has a threaded section 32 with an external thread, which is separated by an annular flange 33 from a hexagonal section 34 projecting into the open.
  • the threaded section 32 is adjustably screwed to the switch housing 1.
  • the ring flange 33 is sealed against contamination by means of a sealing ring 35 on the switch housing 1; on the one hand he has a shoulder surface 36 of the switch housing 1 and on the other hand one through one into the Switch housing 1 inserted locking ring 37 formed shoulder surface 38 opposite.
  • the distance between the two shoulder surfaces 36 and 38 is greater than the thickness of the ring flange 33, it determines the maximum displacement stroke of the ring flange 33 and thus limits the screw stroke for the threaded sleeve 31 relative to the switch housing 1.
  • the hexagon section 34 located outdoors is penetrated by transverse bores 39 , one of which is penetrated by a sealing wire 41 held on the switch housing 1 by means of a holder 40.
  • a rotary lever 43 engages, which is rotatably mounted on the switch housing 1 in its central region.
  • the end 42 forms, together with the two individual stops 24 and 28, a stop device 24, 28, 42.
  • the microswitch 46 has a normal switching behavior: for switching, the switching plunger 45 must be pressed in against a certain spring force; after a certain pushing-in stroke, the microswitch 46 snaps into its switched position, the spring force loading the switching plunger 45 in its pushing-out direction being suddenly reduced significantly; when the switching plunger is released, the reduced spring force pushes it out of the microswitch 46, the microswitch 46 snapping back into its unswitched switching position and increasing the spring load of the switching plunger 45 to the initial value during this snap operation.
  • a lever arm 47 projects from the rotary lever 43 and has a plurality of holding bores 48 arranged in a row and passing through it.
  • a tension spring 49 is suspended, which on the other hand is held on the switch housing 1 and acts as a torsion spring acting on the rotary lever 43 such a torque that its end 44 is present with a force on the switching plunger 45 which is less than that in the unswitched state , but larger than the one in the switched state of the microswitch 46 acting on the switching plunger 45 Is spring force.
  • the microswitch 46 By dimensioning the strength of the tension spring 49, together with the microswitch 46 and the rotary lever 43, it forms a bistable switching device, that is to say, in the absence of further forces, the microswitch 46 maintains the unswitched switching position under the predominant spring load of its switching plunger 45, but in the switched state, under the predominant load by the tension spring 49 in the switched state.
  • the microswitch 46 can be single or multi-pole, the cable connections are made through a housing part 50.
  • the spring plate 10 is in its uppermost screw position on the threaded spindle 13, the control spring 7 being set to the lowest pretension.
  • the threaded sleeve 31 is also in its uppermost screw position in the switch housing 1, with its ring flange 33 abutting the shoulder surface 36.
  • the nut 27 is also in its uppermost screw position on the threaded section 26, the distance between the individual stops 24 and 28 being only slightly larger than the thickness of the lever end 42; the pressure switch is thus set to the lowest switching hysteresis.
  • the control fields 7 hold the switching piston 3 in its lowest position, in which it is intercepted by contact with the switch housing 1.
  • the rotary lever 43 is located by engaging its end 42 between the two individual stops 24 and 28 in its left rotational position, in which it holds the microswitch 46 under the force of the tension spring 49 when the switching plunger 45 is pressed in the switched position.
  • the switching piston 3 begins to rise against the force of the control spring 7 when a certain pressure level is exceeded, taking the plunger 20 with it.
  • the lower individual stop 28 immediately runs against the lever end 42 and takes it by turning the lever 43 to the right With.
  • the switching plunger 45 is hereby released and expressed under its spring load from the microswitch 46 until the microswitch 36 snaps into its unswitched switching position, the suddenly increased spring load of the switching plunger 45 turning the rotary lever 43 into one of the rest positions of the switching plunger 45, lifting it off the individual stop 28 Position rotates.
  • the individual stop 28 can come to rest against the rotary lever 43 and rotate it counterclockwise against the force of the tension spring 49 while lifting off the switching plunger 45; the uppermost stroke position of the switching piston 3 is limited by its contact with the lower end of the threaded spindle 13.
  • the switching piston 3 When the pressure in the pressurizing chamber 4 is subsequently reduced, the switching piston 3 lowers again under the force of the control spring 7, the rotary lever 43 rotating to the left under the force of the tension spring 49 until its lever end 44 abuts the switching plunger 45.
  • the switching piston 3 When the switching piston 3 is lowered further, the rotary lever 43 remains in its position until the upper individual stop 24 comes to rest on the lever end 42 and via this rotates the rotary lever 43 further to the left.
  • the switching plunger 45 is pressed into the microswitch 46 until it snaps into its switched position, whereupon the tension spring 49 overcomes the pushing-out force of the switching plunger 45 and fully presses it in.
  • the switching piston 3 returns to its lowest position shown, determined by resting on the switch housing 1.
  • the stroke position difference of the switching piston 3 corresponds to an application pressure difference for the switching piston 3 that represents a switching hysteresis.
  • the spring plate 10 can be screwed downward on the threaded spindle 13, for example by means of a wrench, by turning the hexagonal section 15, whereby the pretension of the control spring 7 is increased and the switching pressure of the pressure switch is increased. After setting the desired switching pressure, a new sealing wire 17 can be attached to secure. Since the distance between the individual stops 24 and 28 does not change when the switching pressure is set, the switching hysteresis remains constant in this setting process.
  • the threaded sleeve 31 To change the switching hysteresis, after loosening the sealing wire 41, the threaded sleeve 31 must be unscrewed from the switch housing 1, for example by means of a wrench to be attached to the hexagonal section 34. When screwing the threaded sleeve 31, this takes the nut 27 with it via its inner profile surfaces 29, as a result of which it is screwed downward onto the threaded section 26 of the plunger 20 and the single stop 28 thus moves away from the single stop 24. The distance between the two individual stops 24 and 28 is thus increased; this increased distance corresponds to an increased stroke position difference of the switching piston 3 during the switching operations of the microswitch 46 and a correspondingly increased pressure difference and thus switching hysteresis. The threaded sleeve 31 can be unscrewed until its ring flange 33 strikes the lower shoulder surface 38; the greatest possible distance between the two individual stops 24 and 28 and thus the maximum switching hysteresis is then set
  • the stroke limitation for the screwing of the threaded sleeve 31 by means of abutment of the ring flange 33 thereof on the switch surfaces 36 and 38 also limits the rotation and thus the screwing stroke of the nut 27 on the threaded section 26. Even when large rotational forces are applied to the threaded sleeve 31, jamming, for example jamming of the lever end 42, is thus between the individual stops 24 and 28 by setting a too small distance, safely excluded.
  • the plunger 20 can be integrally formed with the section 21, the individual stop 24 and the threaded spindle 26 without a profile surface section 25, the individual stop 24 is expediently formed by the lower end of the section 21 to be reinforced.
  • the single stop 24 can also be formed by a cross pin to be inserted into the plunger 20.
  • the axially displaceable, non-rotatable guidance of the nut 27 on the threaded sleeve 31 can, of course, also be achieved by designing the inner profile surfaces 29, which are widely understood in their wording, as the prism-like guide device with square, hexagonal or other polygonal surface cross section described and shown above.
  • this also includes a tongue and groove guide with a cross pin engaging in at least one axial groove of one part on the other part, a tongue and groove guide or the like.
  • a vent valve 51 of conventional design is provided for the atmospheric connection of the interior of the pressure switch which also surrounds the spring chamber 6.

Abstract

The pressure switch has a switching piston (3) which can be acted on by a control spring (7) against a switching pressure. To adjust the switching pressure, the control spring is supported via a spring plate (10) against the switch housing (1), which spring plate is arranged such that it can be screwed on a threaded spindle (13). The threaded spindle (13) is supported on the switch housing (1), in an axially unmovable manner, and can be turned at random by means of a hexagonal section (15) projecting into free space. A ram (20), connected to the switching piston (3), has two individual stops (24 and 28) between which there engages the end (42) of a rotating lever (43). On the other hand, the switching ram (45) of a microswitch (46) rests on the rotating lever (43), the rotating lever (43) being spring-loaded in the switching direction of the microswitch (46). In order to adjust the switching hysteresis, the one individual stop (28) is formed by a nut (27) which can be screwed on the ram (20). The nut (27) cannot rotate and is coupled in an axially moving manner to a threaded sleeve (31) which is screwed to the switch housing (1). The screwing lifting movement of the threaded sleeve (31) is limited by stops. The threaded sleeve (31) can be rotated at random by means of a hexagonal section (34) projecting into free space. The two hexagonal sections (15 and 34) are located on opposite sides of the switch housing (1). The arrangement ensures separate adjustment, without sticking, of the switching pressure and of the switching hysteresis. <IMAGE>

Description

Die Erfindung betrifft einen Druckschalter nach dem Gattungsbegriff des Patentanspruches 1.The invention relates to a pressure switch according to the preamble of claim 1.

Bei Druckschaltern der gattungsgemäßen Art (DE-A-3 337 530) sind zwei Einzelanschläge tragende Kupplungsscheiben vorgesehen, von welchen mindestens eine mittels eines Mitnehmerelements mit einem im Druckschaltergehäuse drehbar gelagerten Hysterese-Stellelement in Zwangsverbindung ist, derart, daß der Axialabstand der beiden Einzelanschläge zum Zwecke der Verstellung der Hysterese veränderbar ist. Im Hysterese-Stellelement ist drehbar eine Stellschraube für die erste Justierverschraubung gelagert, d.h. daß ein Verdrehen der Stellschraube ungewollt zu einem Verdrehen des Hysterese-Stellelements und damit zu einer Betätigung der zweiten Justierverschraubung führen kann. Auch ist ein Verklemmen des Stellelements bei Drehbetätigung nicht auszuschließen.In pressure switches of the generic type (DE-A-3 337 530) two clutch plates carrying individual stops are provided, of which at least one is positively connected by means of a driver element with a hysteresis adjusting element rotatably mounted in the pressure switch housing, such that the axial distance between the two single stops The purpose of adjusting the hysteresis is changeable. An adjusting screw for the first adjustment screw connection is rotatably mounted in the hysteresis adjusting element, i.e. that a twisting of the adjusting screw can inadvertently lead to a twisting of the hysteresis adjusting element and thus to an actuation of the second adjusting screw. A jamming of the control element when turning is also not excluded.

Davon ausgehend besteht die Aufgabe der Erfindung darin, einen Druckschalter der in Rede stehenden Art so auszugestalten, daß durch Doppelfunktion des Hysterese-Stellelements verursachte Fehleinstellungen vermeidbar sind; auch durch Verklemmungen verursachte Fehleinstellungen sollen ausgeschlossen werden.Based on this, the object of the invention is to design a pressure switch of the type in question so that incorrect settings caused by the double function of the hysteresis adjusting element can be avoided; also Incorrect settings caused by jams should be excluded.

Zur Lösung dieser Aufgabe dienen die Merkmale nach dem Kennzeichnungsteil des Patentanspruches 1.The features according to the characterizing part of claim 1 serve to solve this problem.

Der Druckschalter weist zwei baulich völlig voneinander getrennte Justierverschraubungen zum getrennten Einstellen der Vorspannung der Regelfeder und damit des Schaltdruckes einerseits und des axialen Abstandes der Einzelanschläge und damit der Schalthysterese andererseits auf, wobei die Verstellung des axialen Abstandes der Einzelanschläge durch die Hubbegrenzung der Gewindehülse verklemmungsfrei begrenzt ist.The pressure switch has two structurally completely separate adjusting screw connections for separately adjusting the preload of the control spring and thus the switching pressure on the one hand and the axial distance between the individual stops and thus the switching hysteresis on the other hand, the adjustment of the axial distance of the individual stops being limited by the stroke limitation of the threaded sleeve without jamming .

Vorteilhafte Ausgestaltungen und Weiterbildungen sind in weiteren Patentansprüchen aufgeführt.Advantageous refinements and developments are listed in further patent claims.

In der Zeichung ist ein Ausführungsbeispiel für einen nach der Erfindung ausgebildeten Druckschalter dargestellt, und zwar zeigt

  • Figur 1 ein Schnittbild und
  • Figur 2 einen Ausschnitt aus Figur 1 in vergrößertem Maßstab.
In the drawing, an embodiment of a pressure switch designed according to the invention is shown, namely shows
  • Figure 1 is a sectional view and
  • Figure 2 shows a detail of Figure 1 on an enlarged scale.

Der Druckschalter weist ein Schaltergehäuse 1 auf, welches einen Zylinderabschnitt 2 beinhaltet, in welchem ein Schaltkolben 3 abgedichtet verschieblich geführt ist. Zur einen Seite des Schaltkolbens 3 befindet sich ein Beaufschlagungsraum 4, der mit einem Leitungsanschluß 5 zum Zuführen eines Schaltdruckes verbunden ist. Andererseits grenzt an den Schaltkolben 3 ein mit Atmosphärendruck beaufschlagter Federraum 6 an, in welchem sich eine gegebenenfalls aus mehreren Einzelfedern zusammengesetzte Regelfeder 7 befindet. Die zum Schaltkolben 3 gleichachsige Regelfeder 7 liegt schaltkolbenseitig auf einem Federteller 8 auf, welcher zum Ausgleich von Federunregelmäßigkeiten über eine Kugel 9 gegen den Schaltkolben 3 abgestützt ist. Andererseits, schaltkolbenabgewandt, stützt sich die Regelfeder 7 gegen einen Federteller 10 ab, welcher mittels einer radial vorspringenden Nase 11 in einen Längsschlitz 12 des Schaltergehäuses 1 eingreift und so undrehbar axialverschieblich geführt ist. Der Federteller 10 ist zentrisch mit einer Gewindespindel 13 verschraubt, welche in Wirkrichtung der Regelfeder 7 mittels eines Ringflansches 14 axial unverschieblich und drehbar gegen das Schaltergehäuse 1 abgestützt ist. Die Gewindespindel 13 durchsetzt mit einem zylindrischen Abschnitt eine Wandung des Schaltergehäuses 1 und endet im Freien mit einem Sechskantabschnitt 15. Der Sechskantabschnitt 15 ist von Querbohrungen 16 durchsetzt, durch deren eine ein Plombierdraht 17 geführt ist, der vermittels einer Halterung 18 am Schaltergehäuse 1 festgelegt ist.The pressure switch has a switch housing 1, which contains a cylinder section 2, in which a switching piston 3 is displaceably guided in a sealed manner. On one side of the switching piston 3 there is an application chamber 4 which is connected to a line connection 5 for supplying a switching pressure. On the other hand, the switching piston 3 is adjoined by a spring chamber 6 which is subjected to atmospheric pressure and in which there is a control spring 7 which may be composed of a plurality of individual springs. The control spring 7, which is coaxial with the switching piston 3, rests on the switching piston side on a spring plate 8 which is supported against the switching piston 3 via a ball 9 to compensate for spring irregularities. On the other hand, facing away from the switching piston, the control spring 7 is supported against a spring plate 10, which engages in a longitudinal slot 12 of the switch housing 1 by means of a radially projecting nose 11 and is thus guided in a non-rotatable manner axially. The spring plate 10 is screwed centrically to a threaded spindle 13 which is axially immovable and rotatably supported against the switch housing 1 in the effective direction of the control spring 7 by means of an annular flange 14. The threaded spindle 13 passes through a wall of the switch housing 1 with a cylindrical section and ends outdoors with a hexagon section 15. The hexagon section 15 is penetrated by transverse bores 16, through which a sealing wire 17 is guided, which is fixed to the switch housing 1 by means of a holder 18 .

Ein zwischen den Ringflansch 14 und die Wandung des Schaltergehäuses 1 eingelegter Dichtring 19 hindert Fremdkörper bzw. Schmutz am Eindringen in den Federraum 6.A sealing ring 19 inserted between the ring flange 14 and the wall of the switch housing 1 prevents foreign bodies or dirt from entering the spring chamber 6.

Der Schaltkolben 3 trägt einen Stößel 20, der den Beaufschlagungsraum 4 durchragt und mit einem zylindrischen Abschnitt 21 eine den Beaufschlagungsraum 4 begrenzende Wandung 22 des Schaltergehäuses 1 abgedichtet verschieblich durchsetzt. In den Abschnitt 21 ist ein ebenfalls dem Stößel 20 zugehörender, als Gewindestift ausgebildeter Abschnitt 23 eingeschraubt, wobei zwischen die beiden Abschnitte 21 und 23 eine radial überstehende Ringscheibe als Einzelanschlag 24 eingespannt ist. Der Abschnitt 23 ist im Anschluß an den Einzelanschlag 24 zu seinem Einschrauben in den Abschnitt 21 mit einem Profilflächenabschnitt 25 versehen, an welchen sich ein Gewindeabschnitt 26 anschließt, welcher das Ende des Stößels 20 bildet. Mit dem Gewindeabschnitt 26 ist verstellbar eine Mutter 27 verschraubt, deren eine Stirnfläche einen dem Einzelanschlag 24 mit Abstand gegenüberstehenden, zweiten Einzelanschlag 28 bildet. Die äußere Mantelfläche der Mutter 27 ist zu achsparallel verlaufenden Profilflächen ausgebildet, mit welchen die Mutter 27 an korrespondierenden Innenprofilflächen 29 in einer Ausnehmung 30 einer die Mutter 27 umschließenden Gewindehülse 31 zu dieser undrehbar, aber axialverschieblich geführt ist. Der Profilflächenabschnitt 25 des Stößels 20 kann teilweise in eine ihn mit Spiel umgebende, Relativdrehungen zwischen dem Abschnitt 23 und der Mutter 27 ermöglichende Ausnehmung der Mutter 27 eintauchen.The switching piston 3 carries a plunger 20 which extends through the pressurizing chamber 4 and, with a cylindrical section 21, slidably penetrates a wall 22 of the switch housing 1 delimiting the pressurizing chamber 4. A section 23, which also belongs to the plunger 20 and is designed as a threaded pin, is screwed into section 21, a radially projecting annular disk being clamped as a single stop 24 between the two sections 21 and 23. The section 23 is connected to the individual stop 24 for screwing it into the section 21 with a profile surface section 25, which is followed by a threaded section 26 which forms the end of the plunger 20. A nut 27 is adjustably screwed to the threaded section 26, one end face of which forms a second individual stop 28 which is spaced apart from the individual stop 24. The outer circumferential surface of the nut 27 is formed to form axially parallel profile surfaces, with which the nut 27 is guided on corresponding inner profile surfaces 29 in a recess 30 of a threaded sleeve 31 surrounding the nut 27 so as to be non-rotatable but axially displaceable. The profile surface section 25 of the plunger 20 can be partially immersed in a recess in the nut 27 that surrounds it with play and enables relative rotations between the section 23 and the nut 27.

Die Gewindehülse 31 weist einen Gewindeabschnitt 32 mit einem Außengewinde auf, welcher durch einen Ringflansch 33 von einem ins Freie ragenden Sechskantabschnitt 34 abgetrennt ist. Der Gewindeabschnitt 32 ist verstellbar mit dem Schaltergehäuse 1 verschraubt. Der Ringflansch 33 ist zum Verschmutzungsschutz mittels eines Dichtringes 35 abgedichtet verschieblich am Schaltergehäuse 1 geführt; einerseits steht ihm eine Schulterfläche 36 des Schaltergehäuses 1 und andererseits eine durch einen in das Schaltergehäuse 1 eingesetzten Sicherungsring 37 gebildete Schulterfläche 38 gegenüber. Der Abstand der beiden Schulterflächen 36 und 38 ist größer als die Stärke des Ringflansches 33, er bestimmt den maximalen Verschiebehub des Ringflansches 33 und begrenzt damit den Verschraubungshub für die Gewindehülse 31 relativ zum Schaltergehäuse 1. Der im Freien befindliche Sechskantabschnitt 34 ist von Querbohrungen 39 durchsetzt, deren eine von einem mittels einer Halterung 40 am Schaltergehäuse 1 festgehaltenen Plombierdraht 41 durchsetzt ist.The threaded sleeve 31 has a threaded section 32 with an external thread, which is separated by an annular flange 33 from a hexagonal section 34 projecting into the open. The threaded section 32 is adjustably screwed to the switch housing 1. The ring flange 33 is sealed against contamination by means of a sealing ring 35 on the switch housing 1; on the one hand he has a shoulder surface 36 of the switch housing 1 and on the other hand one through one into the Switch housing 1 inserted locking ring 37 formed shoulder surface 38 opposite. The distance between the two shoulder surfaces 36 and 38 is greater than the thickness of the ring flange 33, it determines the maximum displacement stroke of the ring flange 33 and thus limits the screw stroke for the threaded sleeve 31 relative to the switch housing 1. The hexagon section 34 located outdoors is penetrated by transverse bores 39 , one of which is penetrated by a sealing wire 41 held on the switch housing 1 by means of a holder 40.

Zwischen die beiden Einzelanschläge 24 und 28 greift ein Ende 42 eines Drehhebels 43 ein, der in seinem mittleren Bereich drehbar am Schaltergehäuse 1 gelagert ist. Das Ende 42 bildet zusammen mit den beiden Einzelanschlägen 24 und 28 eine Anschlagvorrichtung 24, 28, 42. Am anderen Ende 44 des Drehhebels 43 liegt ein Schaltstößel 45 eines üblichen Mikroschalters 46 an. Der Mikroschalter 46 weist ein übliches Schaltverhalten auf: Zum Schalten ist der Schaltstößel 45 gegen eine bestimmte Federkraft einzudrücken, nach einem bestimmten Eindrückhub schnappt der Mikroschalter 46 in seine geschaltete Stellung um, wobei die den Schaltstößel 45 in dessen Ausdrückrichtung belastende Federkraft sprungartig wesentlich reduziert wird; bei Freigabe des Schaltstößels drückt die reduzierte Federkraft diesen aus dem Mikroschalter 46 heraus, wobei der Mikroschalter 46 in seine ungeschaltete Schaltstellung zurückschnappt und während dieses Schnappvorganges die Federbelastung des Schaltstößels 45 wieder auf den Ausgangswert erhöht. Vom Drehhebel 43 ragt ein Hebelarm 47 aus, der mehrere, in einer Reihe angeordnete, ihn durchsetzende Haltebohrungen 48 aufweist. In eine der Haltebohrungen 48 ist eine Zugfeder 49 eingehängt, welche andererseits am Schaltergehäuse 1 gehalten ist und als Drehfeder wirkend auf den Drehhebel 43 ein derartiges Drehmoment ausübt, daß dessen Ende 44 mit einer Kraft am Schaltstößel 45 anliegt, die geringer als die im ungeschalteten Zustand, aber größer als die im geschalteten Zustand des Mikroschalters 46 von diesem auf den Schaltstößel 45 einwirkende Federkraft ist. Durch diese Bemessung der Stärke der Zugfeder 49 bildet diese zusammen mit dem Mikroschalter 46 und dem Drehhebel 43 eine bistabile Schaltvorrichtung, das heißt, bei Fehlen weiterer Kräfte behält der Mikroschalter 46 unter der überwiegenden Federbelastung seines Schaltstößels 45 die ungeschaltete Schaltstellung, im geschalteten Zustand dagegen unter der überwiegenden Belastung durch die Zugfeder 49 den geschalteten Zustand bei. Der Mikroschalter 46 kann ein- oder mehrpolig ausgebildet sein, die Kabelanschlüsse erfolgen durch einen Gehäuseteil 50.Between the two individual stops 24 and 28, one end 42 of a rotary lever 43 engages, which is rotatably mounted on the switch housing 1 in its central region. The end 42 forms, together with the two individual stops 24 and 28, a stop device 24, 28, 42. At the other end 44 of the rotary lever 43 there is a switching plunger 45 of a conventional microswitch 46. The microswitch 46 has a normal switching behavior: for switching, the switching plunger 45 must be pressed in against a certain spring force; after a certain pushing-in stroke, the microswitch 46 snaps into its switched position, the spring force loading the switching plunger 45 in its pushing-out direction being suddenly reduced significantly; when the switching plunger is released, the reduced spring force pushes it out of the microswitch 46, the microswitch 46 snapping back into its unswitched switching position and increasing the spring load of the switching plunger 45 to the initial value during this snap operation. A lever arm 47 projects from the rotary lever 43 and has a plurality of holding bores 48 arranged in a row and passing through it. In one of the holding holes 48, a tension spring 49 is suspended, which on the other hand is held on the switch housing 1 and acts as a torsion spring acting on the rotary lever 43 such a torque that its end 44 is present with a force on the switching plunger 45 which is less than that in the unswitched state , but larger than the one in the switched state of the microswitch 46 acting on the switching plunger 45 Is spring force. By dimensioning the strength of the tension spring 49, together with the microswitch 46 and the rotary lever 43, it forms a bistable switching device, that is to say, in the absence of further forces, the microswitch 46 maintains the unswitched switching position under the predominant spring load of its switching plunger 45, but in the switched state, under the predominant load by the tension spring 49 in the switched state. The microswitch 46 can be single or multi-pole, the cable connections are made through a housing part 50.

Im Einstellzustand nach der Zeichnung befindet sich der Federteller 10 in seiner obersten Schraubstellung auf der Gewindespindel 13, wobei die Regelfeder 7 auf geringste Vorspannung eingestellt ist. Auch die Gewindehülse 31 befindet sich in ihrer obersten Schraubstellung im Schaltergehäuse 1, wobei ihr Ringflansch 33 an der Schulterfläche 36 anliegt. Die Mutter 27 befindet sich dabei ebenfalls in ihrer obersten Schraubstellung auf dem Gewindeabschnitt 26, wobei der Abstand zwischen den Einzelanschlägen 24 und 28 nur geringfügig größer als die Stärke des Hebelendes 42 ist; der Druckschalter ist damit auf geringste Schalthysterese eingestellt. Im dargestellten, drucklosen Zustand hält die Regelfelder 7 den Schaltkolben 3 in dessen unterster Stellung, in welcher er durch Anlage am Schaltergehäuse 1 abgefangen ist. Der Drehhebel 43 befindet sich dabei durch Eingriffe seines Endes 42 zwischen die beiden Einzelanschläge 24 und 28 in seiner linken Drehlage, in welcher er unter der Kraft der Zugfeder 49 den Mikroschalter 46 bei eingedrücktem Schaltstößel 45 in der geschalteten Lage hält.In the setting state according to the drawing, the spring plate 10 is in its uppermost screw position on the threaded spindle 13, the control spring 7 being set to the lowest pretension. The threaded sleeve 31 is also in its uppermost screw position in the switch housing 1, with its ring flange 33 abutting the shoulder surface 36. The nut 27 is also in its uppermost screw position on the threaded section 26, the distance between the individual stops 24 and 28 being only slightly larger than the thickness of the lever end 42; the pressure switch is thus set to the lowest switching hysteresis. In the depressurized state shown, the control fields 7 hold the switching piston 3 in its lowest position, in which it is intercepted by contact with the switch housing 1. The rotary lever 43 is located by engaging its end 42 between the two individual stops 24 and 28 in its left rotational position, in which it holds the microswitch 46 under the force of the tension spring 49 when the switching plunger 45 is pressed in the switched position.

Wird durch den Leitungsanschluß 5 dem Beaufschlagungsraum 4 Druckmittel zugeführt, so beginnt sich bei Überschreiten einer bestimmten Druckhöhe der Schaltkolben 3 entgegen der Kraft der Regelfeder 7 anzuheben, wobei er den Stößel 20 mitnimmt. Bei dieser Hubbewegung läuft alsbald der untere Einzelanschlag 28 gegen das Hebelende 42 an und nimmt dieses unter Rechtsdrehen des Hebels 43 mit. Der Schaltstößel 45 wird hierdurch freigegeben und unter seiner Federbelastung aus dem Mikroschalter 46 ausgedrückt, bis der Mikroschalter 36 in seine ungeschaltete Schaltstellung schnappt, wobei die plötzlich verstärkte Federbelastung des Schaltstößels 45 den Drehhebel 43 unter Abheben vom Einzelanschlag 28 in eine der Ruhelage des Schaltstößels 45 entsprechende Stellung dreht. Bei weiterem Druckanstieg im Beaufschlagsraum 4 kann der Einzelanschlag 28 wieder zur Anlage am Drehhebel 43 gelangen und diesen entgegen der Kraft der Zugfeder 49 unter Abheben vom Schaltstößel 45 nach rechts drehen; die oberste Hubstellung des Schaltkolbens 3 ist durch dessen Anlage am unteren Ende der Gewindespindel 13 begrenzt.If pressure medium is supplied to the pressurizing chamber 4 through the line connection 5, the switching piston 3 begins to rise against the force of the control spring 7 when a certain pressure level is exceeded, taking the plunger 20 with it. During this lifting movement, the lower individual stop 28 immediately runs against the lever end 42 and takes it by turning the lever 43 to the right With. The switching plunger 45 is hereby released and expressed under its spring load from the microswitch 46 until the microswitch 36 snaps into its unswitched switching position, the suddenly increased spring load of the switching plunger 45 turning the rotary lever 43 into one of the rest positions of the switching plunger 45, lifting it off the individual stop 28 Position rotates. If the pressure in the pressurizing space 4 increases further, the individual stop 28 can come to rest against the rotary lever 43 and rotate it counterclockwise against the force of the tension spring 49 while lifting off the switching plunger 45; the uppermost stroke position of the switching piston 3 is limited by its contact with the lower end of the threaded spindle 13.

Bei nachfolgender Druckabsenkung im Beaufschlagsraum 4 senkt sich der Schaltkolben 3 unter der Kraft der Regelfeder 7 wieder ab, wobei sich der Drehhebel 43 unter der Kraft der Zugfeder 49 bis zur Anlage seines Hebelendes 44 am Schaltstößel 45 nach links dreht. Bei weiterer Absenkung des Schaltkolbens 3 verharrt der Drehhebel 43 in seiner Stellung, bis der obere Einzelanschlag 24 zur Anlage am Hebelende 42 gelangt und über dieses den Drehhebel 43 weiter nach links dreht. Hierbei wird der Schaltstößel 45 in den Mikroschalter 46 eingedrückt, bis dieser in seine geschaltete Stellung schnappt, woraufhin die Zugfeder 49 die Ausdrückkraft des Schaltstößels 45 überwindet und diesen völlig eindrückt. Unmittelbar nachfolgend gelangt der Schaltkolben 3 wieder in seine unterste, durch Auflage am Schaltergehäuse 1 bestimmte, dargestellte Stellung.When the pressure in the pressurizing chamber 4 is subsequently reduced, the switching piston 3 lowers again under the force of the control spring 7, the rotary lever 43 rotating to the left under the force of the tension spring 49 until its lever end 44 abuts the switching plunger 45. When the switching piston 3 is lowered further, the rotary lever 43 remains in its position until the upper individual stop 24 comes to rest on the lever end 42 and via this rotates the rotary lever 43 further to the left. Here, the switching plunger 45 is pressed into the microswitch 46 until it snaps into its switched position, whereupon the tension spring 49 overcomes the pushing-out force of the switching plunger 45 and fully presses it in. Immediately afterwards, the switching piston 3 returns to its lowest position shown, determined by resting on the switch housing 1.

Es ist wesentlich, daß bei ansteigendem Druck im Beaufschlagungsraum 4 das Schalten des Mikroschalters 46 durch Anlage des Hebelendes 42 am unteren Einzelanschlag 25, also bei höherer Hubstellung des Schaltkolbens 3 erfolgt als bei absinkendem Druck im Beaufschlagungsraum 4, wobei das Schalten des Mikroschalters 46 durch Anlage des Hebelendes 42 am oberen Einzelanschlag 24 und damit bei niedrigerer Hubstellung des Schaltkolbens 3 erfolgt. Der Hubstellungsdifferenz des Schaltkolbens 3 entspricht eine eine Schalthysterese darstellende Beaufschlagungsdruckdifferenz für den Schaltkolben 3.It is essential that when the pressure in the pressurizing chamber 4 rises, the switching of the microswitch 46 takes place by the lever end 42 being in contact with the lower individual stop 25, that is to say when the switching piston 3 is in a higher stroke position than when the pressure in the pressurizing chamber 4 drops, the microswitch 46 being switched by the system of the lever end 42 at the upper individual stop 24 and thus at a lower stroke position of the switching piston 3. The stroke position difference of the switching piston 3 corresponds to an application pressure difference for the switching piston 3 that represents a switching hysteresis.

Nach Lösen des Plombierdrahtes 17 kann durch Drehen des Sechskantabschnittes 15 beispielsweise mittels eines Schraubenschlüssels der Federteller 10 auf der Gewindespindel 13 nach abwärts verschraubt werden, wodurch die Vorspannung der Regelfeder 7 gesteigert und damit der Schaltdruck des Druckschalters erhöht wird. Nach Einstellung des gewünschten Schaltdruckes kann zur Sicherung ein neuer Plombierdraht 17 angebracht werden. Da sich beim Einstellen des Schaltdruckes der Abstand der Einzelanschläge 24 und 28 nicht ändert, bleibt bei diesem Einstellvorgang die Schalthysterese konstant.After loosening the sealing wire 17, the spring plate 10 can be screwed downward on the threaded spindle 13, for example by means of a wrench, by turning the hexagonal section 15, whereby the pretension of the control spring 7 is increased and the switching pressure of the pressure switch is increased. After setting the desired switching pressure, a new sealing wire 17 can be attached to secure. Since the distance between the individual stops 24 and 28 does not change when the switching pressure is set, the switching hysteresis remains constant in this setting process.

Zum Verändern der Schalthysterese ist nach Lösen des Plombierdrahtes 41 die Gewindehülse 31 beispielsweise vermittels eines an den Sechskantabschnitt 34 anzusetzenden Schraubenschlüssels aus dem Schaltergehäuse 1 herauszuschrauben. Beim Verschrauben der Gewindehülse 31 nimmt diese über ihre Innenprofilflächen 29 die Mutter 27 mit, wodurch diese sich auf dem Gewindeabschnitt 26 des Stößels 20 abwärts verschraubt und sich somit der Einzelanschlag 28 vom Einzelanschlag 24 entfernt. Der Abstand zwischen den beiden Einzelanschlägen 24 und 28 wird somit vergrößert; diesem vergrößerten Abstand entspricht eine vergrößerte Hubstellungsdifferenz des Schaltkolbens 3 bei den Schaltvorgängen des Mikroschalters 46 und eine dementsprechend vergrößerte Druckdifferenz und somit Schalthysterese. Das Ausschrauben der Gewindehülse 31 kann bis zum Anschlagen ihres Ringflansches 33 an der unteren Schulterfläche 38 erfolgen, es ist dann der größtmögliche Abstand der beiden Einzelanschläge 24 und 28 und damit die maximale Schalthysterese eingestellt.To change the switching hysteresis, after loosening the sealing wire 41, the threaded sleeve 31 must be unscrewed from the switch housing 1, for example by means of a wrench to be attached to the hexagonal section 34. When screwing the threaded sleeve 31, this takes the nut 27 with it via its inner profile surfaces 29, as a result of which it is screwed downward onto the threaded section 26 of the plunger 20 and the single stop 28 thus moves away from the single stop 24. The distance between the two individual stops 24 and 28 is thus increased; this increased distance corresponds to an increased stroke position difference of the switching piston 3 during the switching operations of the microswitch 46 and a correspondingly increased pressure difference and thus switching hysteresis. The threaded sleeve 31 can be unscrewed until its ring flange 33 strikes the lower shoulder surface 38; the greatest possible distance between the two individual stops 24 and 28 and thus the maximum switching hysteresis is then set.

Durch die Hubbegrenzung für die Verschraubung der Gewindehülse 31 vermittels Anschlagen deren Ringflansches 33 an den Schalterflächen 36 und 38 wird zugleich die Drehung und damit der Verschraubungshub der Mutter 27 auf dem Gewindeabschnitt 26 begrenzt. Auch bei Aufbringen großer Drehkräfte auf die Gewindehülse 31 wird somit ein Verklemmen, beispielsweise ein Einklemmen des Hebelendes 42 zwischen die Einzelanschläge 24 und 28 durch Einstellen eines zu kleinen Abstandes, sicher ausgeschlossen.The stroke limitation for the screwing of the threaded sleeve 31 by means of abutment of the ring flange 33 thereof on the switch surfaces 36 and 38 also limits the rotation and thus the screwing stroke of the nut 27 on the threaded section 26. Even when large rotational forces are applied to the threaded sleeve 31, jamming, for example jamming of the lever end 42, is thus between the individual stops 24 and 28 by setting a too small distance, safely excluded.

Es kann zweckmäßig sein, beim Justieren des Druckschalters zuerst dessen Schalthysterese und dann den Schaltdruck einzustellen, da beim Einstellen der Schalthysterese sich der Abstand des unteren Einzelanschlages 28 vom Schaltkolben 3 ändert. Andererseits ist es jedoch auch möglich, erst den durch Anlage des Hebelendes 42 am oberen Einzelanschlag 24 bestimmten Einschaltdruck für den Mikroschalter 46 und sodann die Schalthysterese mit dem durch Anlage des Hebelendes 42 am unteren Einzelanschlag 28 bestimmten Ausschaltdruck zu justieren.It may be expedient to first set the switching hysteresis and then the switching pressure when adjusting the pressure switch, since the distance of the lower individual stop 28 from the switching piston 3 changes when the switching hysteresis is set. On the other hand, however, it is also possible to first adjust the switch-on pressure for the microswitch 46 determined by the lever end 42 at the upper individual stop 24 and then the switching hysteresis with the switch-off pressure determined by the lever end 42 at the lower individual stop 28.

In Abänderung vom dargestellten und vorstehend beschriebenen Ausführungsbeispiel ist es selbstverständlich auch möglich, anstelle des monostabilen Mikroschalters 46, der zusammen mit der Zugfeder 49 die bistabile Schnappschaltvorrichtung bildet, einen von vorneherein selbst bistabil ausgebildeten Schnappschalter zu verwenden, die Zugfeder 49 kann dabei entfallen. Durch bezogen auf das Hebelende 44 nach unten versetzte, umgekehrte Anordnung des Mikroschalters 46 und nach oben versetzte Anordnung der Zugfeder 49 ist die Zuordnung von Schaltdruckbeaufschlagung des Schaltkolbens 3 und Schaltzustand des Mikroschalters 46 vertauschbar. Weiterhin ist es möglich, die Länge der Gewindespindel 13 derart zu bemessen, daß der Schaltkolben 3 an deren unterem Ende unmittelbar nach dem Schalten des Mikroschalters 46, vor einem Abheben des Hebelendes 44 vom Schaltstößel 45, erfolgt. Schließlich kann der Stößel 20 mit dem Abschnitt 21, dem Einzelanschlag 24 und der Gewindespindel 26 einstückig ohne Profilflächenabschnitt 25 ausgebildet werden, der Einzelanschlag 24 wird dabei zweckmäßig durch das untere Ende des verstärkt auszubildenden Abschnittes 21 gebildet. Andererseits kann der Einzelanschlag 24 auch durch einen in den Stößel 20 einzusetzenden Querstift ausgebildet werden.In a modification of the exemplary embodiment shown and described above, it is of course also possible to use a snap switch which is itself bistable from the outset instead of the monostable microswitch 46, which forms the bistable snap-action switching device together with the tension spring 49, the tension spring 49 can be omitted. Due to the reverse arrangement of the microswitch 46 offset downward relative to the lever end 44 and the arrangement of the tension spring 49 offset upwards, the assignment of the switching pressurization of the switching piston 3 and the switching state of the microswitch 46 can be interchanged. It is also possible to dimension the length of the threaded spindle 13 in such a way that the switching piston 3 takes place at its lower end immediately after the microswitch 46 has been switched, before the lever end 44 is lifted off the switching plunger 45. Finally, the plunger 20 can be integrally formed with the section 21, the individual stop 24 and the threaded spindle 26 without a profile surface section 25, the individual stop 24 is expediently formed by the lower end of the section 21 to be reinforced. On the other hand, the single stop 24 can also be formed by a cross pin to be inserted into the plunger 20.

Die axialverschiebliche, undrehbare Führung der Mutter 27 an der Gewindehülse 31 kann natürlich auch durch andersartige Ausbildung der in ihrem Wortlaut weit zu verstehenden Innenprofilflächen 29 als der vorbeschriebenen und gezeigten, prismenähnlichen Führungsvorrichtung mit Vierkant-, Sechskant- oder sonstigen Vielkantflächenquerschnitt erfolgen. Insbesondere ist hierunter auch eine Nut-Stift-Führung mit in wenigstens eine Axialnut des einen Teiles eingreifendem Querstift am anderen Teil, eine Nut-Feder-Führung oder ergleichen zu verstehen.The axially displaceable, non-rotatable guidance of the nut 27 on the threaded sleeve 31 can, of course, also be achieved by designing the inner profile surfaces 29, which are widely understood in their wording, as the prism-like guide device with square, hexagonal or other polygonal surface cross section described and shown above. In particular, this also includes a tongue and groove guide with a cross pin engaging in at least one axial groove of one part on the other part, a tongue and groove guide or the like.

Zur Atmosphärenverbindung des den Federraum 6 mitumfassenden Innenraumes des Druckschalters ist ein Entlüftungsventil 51 üblicher Bauart vorgesehen.A vent valve 51 of conventional design is provided for the atmospheric connection of the interior of the pressure switch which also surrounds the spring chamber 6.

BezugszeichenlisteReference list

11
SchaltergehäuseSwitch housing
22nd
ZylinderabschnitCylinder section
33rd
SchaltkolbenShift piston
44th
BeaufschlagungsraumPressurization room
55
LeitungsanschlußLine connection
66
FederraumSpring chamber
77
RegelfederRule spring
88th
FedertellerSpring plate
99
KugelBullet
1010th
FedertellerSpring plate
1111
Nasenose
1212th
LängsschlitzLongitudinal slot
1313
GewindespindelThreaded spindle
1414
RingflanschRing flange
1515
SechskantabschnittHexagon section
1616
QuerbohrungCross hole
1717th
PlombierdrahtSealing wire
1818th
Halterungbracket
1919th
Dichtungpoetry
2020th
StößelPestle
2121
Abschnittsection
2222
WandungWall
2323
Abschnittsection
2424th
EinzelanschlagSingle stop
2525th
ProfilflächenabschnittProfile surface section
2626
GewindeabschnittThread section
2727
Muttermother
2828
EinzelanschlagSingle stop
2929
InnenprofilflächenInner profile surfaces
3030th
AusnhemungException
3131
GewindehülseThreaded sleeve
3232
GewindeabschnittThread section
3333
RingflanschRing flange
3434
SechskantabschnittHexagon section
3535
DichtringSealing ring
3636
Schaltflächebutton
3737
SicherungsringCirclip
3838
SchalterflächeSwitch area
3939
QuerbohrungCross hole
4040
Halterungbracket
4141
PlombierdrahtSealing wire
4242
EndeThe End
24, 28, 4224, 28, 42
AnschlagvorrichtungStop device
4343
DrehhebelRotary lever
4444
EndeThe End
4545
SchaltstößelSwitch plunger
4646
MikroschalterMicroswitch
4747
HebelarmLever arm
4848
HaltebohrungHolding hole
4949
ZugfederTension spring
5050
GehäuseteilHousing part
5151
EntlüftungsventilVent valve

Claims (10)

  1. Pressure switch with adjustable switching pressure and adjustable switching hysteresis, having a switching piston (3) acted on by the switching pressure against the force of a governing spring (7), having a stop device (24, 28, 42) with an idling stroke which is movable away from this switching piston, effective in both directions of movement, and having two individual stops (24, 28) axially offset with respect to each other, and having a bistable snap switch device which can be switched by the stop device, the force of the governing spring (7) being adjustable by a first screw adjuster coupling (10, 13) and the axial distance of the individual stops (24, 28) being adjustable by a second screw adjuster coupling (26, 27), and in addition the end of the governing spring (7) remote from the switching piston (3) being supported adjustably by means of the first screw adjuster coupling (10, 13) against the switch housing (1), and the switching piston (3) carrying on its side remote from the governing spring (7) the two individual stops (24, 28), characterised in that a rotatable portion (27) of the second screw adjuster coupling (26, 27) is coupled axially displaceably and non-rotatably to a threaded sleeve (31) adjustably screwed to the switch housing (1), and by means of two axial stops (36, 38) the manually rotatable threaded sleeve (31) can be screwed to the switch housing (1) by only a limited stroke.
  2. Pressure switch according to claim 1, characterised in that the threaded sleeve (31) has a threaded portion (32) screwed to the switch housing (1), an annular flange (33) guided displaceably on the switch housing (1) and possibly sealed, and a profiled, possibly hexagonal portion (34) projecting into the open, and in that a shoulder surface (36, 38) of the switch housing (1) is opposite each side of the annular flange (33), the axial spacing of the shoulder surfaces (36, 38) exceeding the thickness of the annular flange (33) by the maximum screw stroke of the threaded sleeve (31).
  3. Pressure switch according to claim 1 and 2, characterised in that one individual stop (24) is a radial projection connected fixedly to the push rod (20), and the second individual stop (28) is formed by the end face of a nut (27) screwed adjustably to the push rod (20), and in that the nut (27) engaging into an axial recess (30) of the threaded sleeve (31) is guided non-rotatably and longitudinally displaceably for instance by means of profiled surfaces (29) in the recess (30).
  4. Pressure switch according to claim 3, characterised in that the push rod (20) ends with a threaded portion (26) onto which the nut (27) is screwed.
  5. Pressure switch according to claim 4, characterised in that between the switching piston (3) and the individual stop (24) forming the radial projection the push rod (20) has a cylindrical portion (21) which, in an axially movable and sealed fashion, passes through a wall (22) of the switch housing (1) defining a pressure chamber (4) for the switching piston (3).
  6. Pressure switch acccording to claim 3, characterised in that the radial projection forming the individual stop (24) is formed by a cross pin passing through the push rod (20), an annular shoulder located on the push rod, or the like.
  7. Pressure switch according to claim 1, characterised in that the governing spring (7) is supported against a spring washer (10) guided non-rotatably and axially movably on the switch housing (1), this washer being screwed adjustably to a threaded spindle (13) passing through it, and in that the threaded spindle (13) is supported, rotatably and axially non-movably at least in the operating direction of the governing spring, against the switch housing (1), passes through its wall and ends in the open with a profiled, possibly hexagonal, portion (15).
  8. Pressure switch according to claims 2 and 7, characterised in that the profiled, possibly hexagonal, sections (34, 15) of the threaded sleeve (31) and the threaded spindle (13) project out of the switch housing (1) at least approximately coaxially on opposite sides of this switch housing, and have transverse bores (39, 16) through which can be guided sealing wires (41, 17) which can be fixed to the switch housing (1).
  9. Pressure switch according to one or more of the preceding claims, characterised in that the end (42) of a rotary lever (43) engages between the individual stops (24, 28), with the switching push rod (45) of a monostable microswitch (46) abutting against this lever, and in that the rotary lever (43) is loaded by a rotary spring in the switching direction of the microswitch (46), the strength of this spring being less than the force necessary for switching the microswitch (46) but greater than the restoring force effective on the switching push rod (45) when the microswitch (46) is switched on.
  10. Pressure switch according to claim 9, characterised in that the rotary lever (43) has a lever arm (47) engaged by the rotary spring designed as a tension spring (49), adjustable if necessary by hooking into one of several holding bores (48) passing through the lever arm (47) and arranged in a row.
EP89101594A 1988-02-15 1989-01-31 Pressure switch Expired - Lifetime EP0328926B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804685 1988-02-15
DE3804685A DE3804685A1 (en) 1988-02-15 1988-02-15 PRESSURE SWITCH

Publications (3)

Publication Number Publication Date
EP0328926A2 EP0328926A2 (en) 1989-08-23
EP0328926A3 EP0328926A3 (en) 1990-09-26
EP0328926B1 true EP0328926B1 (en) 1995-03-29

Family

ID=6347458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101594A Expired - Lifetime EP0328926B1 (en) 1988-02-15 1989-01-31 Pressure switch

Country Status (4)

Country Link
EP (1) EP0328926B1 (en)
AT (1) ATE120582T1 (en)
DE (2) DE3804685A1 (en)
HU (1) HUT51026A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102623239A (en) * 2012-03-31 2012-08-01 潍坊金丝达环境工程股份有限公司 Non-contact type pressure relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006034637B4 (en) * 2006-07-24 2016-07-21 Robert Bosch Gmbh Hydraulic pressure switch

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1185900A (en) * 1957-11-08 1959-08-07 Control device sensitive to pressure variations of a fluid
FR1224907A (en) * 1959-02-03 1960-06-28 Telemecanique Electrique Improvements to so-called <<manostats>> switches controlled by the pressure of a fluid
US4037317A (en) * 1973-12-27 1977-07-26 Robertshaw Controls Company Method of making fluid operated electrical switch construction
FR2518310A1 (en) * 1981-12-15 1983-06-17 Telemecanique Electrique MANUFACTURER OF VOLUME REDUCED, IMPLEMENTED AND MOUNTED
HU187035B (en) * 1983-04-12 1985-10-28 Human Oltoanyagtermelo Process for production of liofilated absorbed combined vaccines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102623239A (en) * 2012-03-31 2012-08-01 潍坊金丝达环境工程股份有限公司 Non-contact type pressure relay
CN102623239B (en) * 2012-03-31 2014-04-09 潍坊金丝达环境工程股份有限公司 Non-contact type pressure relay

Also Published As

Publication number Publication date
EP0328926A3 (en) 1990-09-26
EP0328926A2 (en) 1989-08-23
ATE120582T1 (en) 1995-04-15
HUT51026A (en) 1990-03-28
DE58909137D1 (en) 1995-05-04
DE3804685A1 (en) 1989-08-24

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