EP2810292B1 - Flow switch - Google Patents

Flow switch Download PDF

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Publication number
EP2810292B1
EP2810292B1 EP12702812.4A EP12702812A EP2810292B1 EP 2810292 B1 EP2810292 B1 EP 2810292B1 EP 12702812 A EP12702812 A EP 12702812A EP 2810292 B1 EP2810292 B1 EP 2810292B1
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EP
European Patent Office
Prior art keywords
flow
flow switch
switch according
liquid
outflow
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EP12702812.4A
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German (de)
French (fr)
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EP2810292A1 (en
Inventor
Michael Böhm
Sebastian TRAUT
Stefan EHRHARDT
Rolf Friedrich
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Alfred Kaercher SE and Co KG
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Alfred Kaercher SE and Co KG
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Publication of EP2810292A1 publication Critical patent/EP2810292A1/en
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    • 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
    • H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane
    • H01H35/405—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane the switch being of the reed switch type

Definitions

  • the invention relates to a flow switch with a flow channel through which a liquid can flow, which has a liquid inlet and a liquid outlet and in which a liquid-dependent displaceable, permanently magnetized switch body is arranged, and with a magnetically actuated depending on the position of the switch body switching element.
  • Such flow switches are used, for example, in heatable high-pressure cleaning devices in which a liquid, preferably water, can be pressurized by a pump and then heated by means of a heat exchanger.
  • a flow switch of the type mentioned is connected in the flow connection between the pump and the heat exchanger.
  • This has a flow channel through which the fluid pressurized by the pump can flow.
  • a permanently magnetized switch body is arranged, which can be moved from the liquid, provided that the flow rate exceeds a limit, starting from a rest position into a switching position. In the switching position can be magnetically actuated by means of the switch body, preferably arranged outside the flow channel switching element.
  • Flow switch of the type mentioned are from the DE 90 11 336 U1 known. They are subject during operation of a considerable mechanical load, since the liquid flowing through the flow channel in many cases has a pressure of over 200 bar, for example, a pressure of 250 bar and often carries dirt particles with it.
  • the entrained dirt particles can lead to an impairment of the flow switch, in particular can lead from the liquid entrained dirt particles to an impairment of the mobility of the switch body.
  • the flow switch has a liquid flow-through flow channel with a liquid inlet and a liquid outlet.
  • a flow-dependent displaceable, permanently magnetized switching body is arranged by the liquid.
  • the flow switch on a function of the position of the switch body magnetically actuated switching element.
  • An inner tube is arranged in the flow channel, which accommodates the displaceable switching body and has a feed opening in fluid communication with the liquid inlet and also has a first and a second outflow opening.
  • the inner tube is surrounded by an annular space which is in fluid communication with the liquid outlet, and the second discharge opening is arranged axially offset from the first discharge opening.
  • the first drain opens into the annulus. It is in the form of a longitudinal slot which extends in the wall of the inner tube along its longitudinal axis. By the Through the longitudinal slot, liquid can flow out of the inner tube and liquid can also flow into the inner tube.
  • Object of the present invention is to develop a flow switch of the type mentioned in such a way that it is less sensitive to dirt particles that are carried by the liquid.
  • an inner tube is arranged, which is the fluid-dependent displaced by the liquid Switch body receives and is surrounded by an annulus.
  • the inner tube is in fluid communication with the liquid inlet of the flow switch via an inflow opening, so that liquid can flow into the inner tube via the inflow opening.
  • the first and second outflow openings arranged axially offset with respect to the longitudinal axis of the inner tube, the liquid can flow out of the inner tube into the annular space, which is in flow connection with the liquid outlet. It has surprisingly been found that its susceptibility to dirt particles can be significantly reduced by such a design of the flow switch.
  • the switch body in the inner tube is displaced from its rest position into its switching position.
  • a part of the liquid entering the inner tube flows out of the inner tube via the at least one first outflow opening and the remaining part of the liquid flows through the inner tube in the direction of its longitudinal axis up to the at least one second outflow opening, whereby this part of the liquid flows along the switching element.
  • the liquid passes via the at least one first outflow opening and the at least one second outflow opening into the annular space which surrounds the inner tube in the circumferential direction and which is in flow connection with the liquid outlet.
  • the inflow opening of the inner tube is arranged on a first, the liquid inlet facing inner tube end face.
  • the liquid enters into the inner tube in the axial direction relative to the longitudinal axis of the inner tube and can flow through it in the axial direction at least until it reaches the at least one first outflow opening.
  • the liquid can impinge on an end face of the switch body and move it in the axial direction.
  • the at least one first outlet opening and the at least one second outlet opening are arranged on a jacket of the inner tube.
  • the liquid thus leaves the inner tube via the first and second outflow openings in the radial direction.
  • a second, the liquid inlet facing away from the inner tube side is closed and the at least one second discharge opening is axially offset from the second inner tube end face.
  • Such a configuration has the consequence that in the area between the at least one second drain opening and the second inner tube end side fluid collects, which slows down the switch body in its movement toward the second inner tube end face and thereby prevents the switch body abruptly abuts against a stop surface.
  • the liquid between the at least one second outflow opening and the second inner tube end face thus forms a damping for the switch body. The risk that this is demagnetized by impact load, this is very low.
  • the flow channel is formed by an outer tube which is aligned coaxially with the inner tube, wherein the liquid outlet is arranged in the region of a tubular jacket of the outer tube and wherein the at least one first discharge opening is positioned at the level of the liquid outlet.
  • the part of the liquid flowing through the at least one first discharge opening can flow in the radial direction through the annulus adjoining the first discharge opening, in order then to reach the liquid outlet of the flow switch.
  • the flow resistance that the flow switch opposes to the liquid can be kept low.
  • the liquid inlet is arranged in an advantageous embodiment of the invention on a first outer tube end face.
  • the first outer tube end face is connected to an inlet line.
  • the outer tube and the inlet line preferably form a one-piece line arrangement. It is favorable if the outer tube is aligned perpendicular to the inlet line.
  • a second, the liquid inlet facing away from the outer tube end side is closed in an advantageous embodiment by means of a plug, wherein a closing element of the inner tube is disposed within the outer tube to the plug.
  • the plug can thus form a support for the closing element.
  • the plug is releasably connectable in a preferred embodiment of the invention with the outer tube.
  • the plug can be screwed into the outer tube.
  • the axial distance between the at least one first outlet opening and the at least one second outlet opening corresponds in a particularly preferred embodiment of the invention at least the length of the switch body. If the flow switch flows through such a configuration of pressurized liquid, it automatically assumes a switching position between the at least one first drain opening and the at least one second drain opening, if the flow rate of the liquid exceeds a limit. A part of the liquid can be deflected from one end face of the switch body in the direction of the at least one first discharge opening, and the remaining part of the liquid can flow around the switch body in the inner tube in the longitudinal direction and reach the at least one second discharge opening downstream of the switch body.
  • the Position of the first and second outflow openings are in such an embodiment, the switching position of the switch body, since this assumes a position between the at least one first drain opening and the at least one second drain opening, provided that its axial extent is not greater than the axial distance between the at least one first drain opening and the at least one second drain opening.
  • the sum of the flow cross sections of the first outflow openings is smaller than the sum of the flow cross sections of the second outflow openings. This ensures that a larger part of the liquid flows through the inner tube along the switch body as far as the at least one second discharge opening and only a smaller part of the liquid flows out of the inner tube via the at least one first discharge opening.
  • the sum of the flow cross sections of the first outflow openings is half as large as the sum of the flow cross sections of the second outflow openings.
  • the flow switch has a single first outlet opening.
  • the single first discharge opening is arranged at the level of the liquid outlet with respect to the longitudinal axis of the inner pipe. It is advantageous if the single first outlet opening is positioned offset in the circumferential direction of the inner tube to the liquid outlet. It is particularly favorable if the single first outflow opening is arranged in the circumferential direction of the inner tube offset by an angle between 10 ° and 45 ° to the liquid outlet.
  • the inner tube has two second outflow openings, which are arranged at the same height relative to the longitudinal axis of the inner tube.
  • the two second outflow openings are arranged offset in an advantageous embodiment of the invention by less than 180 ° to each other, for example, at an angle of 60 ° to 120 °.
  • the flow cross section of the two second outflow openings is favorably identical to the flow cross section of the single first outflow opening.
  • the switch body in the inner tube is surrounded by an annular gap whose radial extent is at least 0.5 mm.
  • the radial extent of the annular gap surrounding the switching body is at least 0.8 mm. The risk that the mobility is affected by entrained by the liquid dirt particles can be kept very low.
  • the radial extent of the annular space surrounding the inner tube is preferably at least 0.5 mm, in particular at least 0.8 mm.
  • a preferred embodiment of a flow switch according to the invention is shown schematically in its position of use, which is generally occupied by the reference numeral 10. It comprises an input line 12 designed as a horizontally oriented tube piece, to which a vertically aligned outer tube 14 adjoins, whose longitudinal axis 15 is aligned perpendicular to the longitudinal axis 16 of the input line.
  • an input line 12 designed as a horizontally oriented tube piece, to which a vertically aligned outer tube 14 adjoins, whose longitudinal axis 15 is aligned perpendicular to the longitudinal axis 16 of the input line.
  • a first outer tube end face 18 which has a liquid inlet 20, via which a liquid which has been pressurized by the pump of a high-pressure cleaning device, for example, can flow into the outer tube 14.
  • One of the input line 12 facing away from the second outer tube end face 22 is closed by a plug 24 which can be screwed into the outer tube 14.
  • Extending between the first outer tube end face 18 and the second outer tube end face 22 is a cylindrical outer tube jacket 26 which, in the direction of the longitudinal axis 15 of the outer tube 14 offset from the longitudinal axis 16 of the input line 12, has a liquid outlet 28 to which an outlet nozzle 30 is integrally formed.
  • outlet pipe 32 To the outlet port 30 a in the drawing only partially shown outlet pipe 32 is connected, via which the liquid can be supplied to a water heater of a high-pressure cleaner.
  • the outer tube 14 defines a flow channel 34 in which an inner tube 36 is arranged.
  • the inner tube 36 is surrounded in the flow channel 34 by an annular space 38 and has a first inner tube end face 40 an inflow opening 42, whereas a liquid inlet 20 facing away from the second réellerohrstirnseite 44 is closed by a closing body 46 which is supported on the plug 24 in the axial direction.
  • a cylindrical inner tube jacket 47 extends between the first inner tube end face 40 and the second inner tube end face 44. Approximately at the level of the liquid outlet 28, the inner tube jacket 47 has a single first discharge opening 48 which is at an angle of approximately 45 ° to the liquid outlet 28 in the circumferential direction of the inner tube 36 is positioned offset.
  • the inner tube jacket 47 has two second outflow openings 50, 51, which, based on the Longitudinal axis 15 at the same height and in the circumferential direction of the inner tube 36 by an angle of less than 180 °, are offset in the illustrated embodiment by an angle of about 90 ° to each other.
  • the first outflow opening 48 opens as well as the two second outflow openings 50, 51 in the annular space 48 which surrounds the inner tube 36 in the circumferential direction.
  • a permanently magnetized switch body in the form of a permanent magnet 54 is slidably disposed in the inner tube 36.
  • the permanent magnet 54 is cylindrical and surrounded over its entire length by an annular gap 56 which extends between the permanent magnet 54 and the inner tube 36.
  • the permanent magnet 54 cooperates with a magnetically actuated switching element in the form of a reed contact arranged on the outside of the outer tube 14. With the help of the reed contact 58, depending on the position of the permanent magnet 54 of a control device of a high-pressure cleaning device, an electrical signal can be provided.
  • the liquid inlet 20 and the inflow opening 42 pressurized liquid, preferably water, can flow upward into the inner tube 36 in a vertical direction. If the flow rate of the inflowing liquid reaches a predetermined limit value, the permanent magnet 54, contrary to its weight, is released from its in FIG. 1 illustrated rest position vertically upwards in his in FIG. 2 shifted switching position shown. In the switching position, the permanent magnet 54 assumes a position between the first outflow opening 48 and the two second outflow openings 50, 51 and the reed contact is closed by the permanent magnet. The length of the permanent magnet 54 is less than the axial distance occupied by the center of the first drain opening 48 to the centers of the second drain openings 50 and 51.
  • a portion of the liquid flowing into the inner tube 36 can flow via the first outflow opening 48 arranged immediately below the permanent magnet 54 located in the switching position and the annular space 38 to the liquid outlet 28 flow, and the remaining part of the flowing into the inner tube 36 liquid flows in a vertical direction through the annular gap 56 along the permanent magnet 54 up to its closing body 56 facing upper end side, and then via the second discharge openings 50, 51 in the radial direction flow out of the inner tube 36 and then to flow through the inner tube 36 surrounding annular space 38 in the vertical direction to the liquid outlet 28.
  • Liquid collects between the two drainage openings 50, 51 and the closing body 46, which prevents the permanent magnet 54 from striking the closing body 46 when it is displaced from the rest position. Rather, the permanent magnet 54 of the liquid flowing through the flow switch 10 reliably in its in FIG. 2 illustrated switch position by occupying a position between the first drain opening 48 and the two second drain openings 50, 51 in a reproducible manner.
  • the annular gap 56 surrounding the permanent magnets 54 in the circumferential direction has an extent of more than 0.5 mm, in particular at least 0.8 mm, in the radial direction.
  • the radial extent of the annular space 38 is also at least 0.5 mm, in particular at least 0.8 mm. This ensures that accumulate in the annular gap 56 and the annular space 38 virtually no dirt particles that are carried by the pressurized fluid.
  • the flow switch 10 provides the liquid relatively large annular gaps and annular spaces available and is characterized by a reproducible switching point of the reed contact 58 at a by the dimensioning of the flow switch 10 predetermined flow rate of the liquid. Occurs for the first time under pressure fluid in the flow switch 10, so the permanent magnet 34 goes from its rest position to its switching position without the risk that the permanent magnet 54 abuts against the closing body 46 and thereby subject to a strong mechanical stress, which is a Demagnetization of the permanent magnet 54 could lead. Due to the relatively large annular gaps and annular spaces, the flow switch 10 only has a relatively low flow resistance, so that the liquid flowing through the flow switch 10 is subject to only a small pressure drop.
  • the flow switch 10 is particularly suitable for use in a heatable high-pressure cleaning device, wherein it is switched into the flow connection between the pump and the water heater.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Description

Die Erfindung betrifft einen Strömungsschalter mit einem von einer Flüssigkeit durchströmbaren Strömungskanal, der einen Flüssigkeitseinlass und einen Flüssigkeitsauslass aufweist und in dem ein von der Flüssigkeit strömungsabhängig verschiebbarer, permanent magnetisierter Schaltkörper angeordnet ist, und mit einem in Abhängigkeit von der Stellung des Schaltkörpers magnetisch betätigbaren Schaltelement.The invention relates to a flow switch with a flow channel through which a liquid can flow, which has a liquid inlet and a liquid outlet and in which a liquid-dependent displaceable, permanently magnetized switch body is arranged, and with a magnetically actuated depending on the position of the switch body switching element.

Derartige Strömungsschalter kommen beispielsweise bei beheizbaren Hochdruckreinigungsgeräten zum Einsatz, bei denen eine Flüssigkeit, vorzugsweise Wasser, von einer Pumpe unter Druck gesetzt und anschließend mit Hilfe eines Wärmetauschers erwärmt werden kann. Um sicherzustellen, dass der Wärmetauscher nur dann in Betrieb gesetzt wird, wenn ihm von der Pumpe Flüssigkeit zugeführt wird, ist in die Strömungsverbindung zwischen der Pumpe und dem Wärmetauscher ein Strömungsschalter der eingangs genannten Art geschaltet. Dieser weist einen Strömungskanal auf, durch den die von der Pumpe unter Druck gesetzte Flüssigkeit hindurchströmen kann. Im Strömungskanal ist ein permanent magnetisierter Schaltkörper angeordnet, der von der Flüssigkeit, sofern deren Strömungsrate einen Grenzwert überschreitet, ausgehend von einer Ruhestellung in eine Schaltstellung verschoben werden kann. In der Schaltstellung kann mittels des Schaltkörpers ein vorzugsweise außerhalb des Strömungskanals angeordnetes Schaltelement magnetisch betätigt werden. Auf diese Weise kann ein elektrischer Kontakt geschlossen und einer Steuerung des Hochdruckreinigungsgerätes ein Schaltsignal zugeführt werden, so dass die Steuerung den Wärmetauscher in Gang setzt. Verringert sich die Strömungsrate der unter Druck gesetzten Flüssigkeit bis unter den vorgegebenen Grenzwert, so geht der Schaltkörper selbsttätig in seine Ruhestellung über. Dies hat zur Folge, dass das magnetisch betätigbare Schaltelement den elektrischen Kontakt öffnet und dadurch die Steuereinrichtung des Hochdruckreinigungsgerätes die Information erhält, dass nur eine unzureichende Strömungsrate vorliegt und deshalb der Wärmetauscher abgeschaltet werden muss. Ansonsten besteht die Gefahr, dass die vom Wärmetauscher bereitgestellte thermische Energie nur unzureichend oder überhaupt nicht abgeführt wird. Dies kann zu einer Überhitzung des Wärmetauschers führen.Such flow switches are used, for example, in heatable high-pressure cleaning devices in which a liquid, preferably water, can be pressurized by a pump and then heated by means of a heat exchanger. To ensure that the heat exchanger is only put into operation when it is supplied by the pump liquid, a flow switch of the type mentioned is connected in the flow connection between the pump and the heat exchanger. This has a flow channel through which the fluid pressurized by the pump can flow. In the flow channel a permanently magnetized switch body is arranged, which can be moved from the liquid, provided that the flow rate exceeds a limit, starting from a rest position into a switching position. In the switching position can be magnetically actuated by means of the switch body, preferably arranged outside the flow channel switching element. In this way, an electrical contact can be closed and a control signal of the high-pressure cleaning device is supplied to a switching signal, so that the controller sets the heat exchanger in motion. Decreases the flow rate of the pressurized liquid to below the predetermined limit, the switching body is automatically in its rest position on. This has the consequence that the magnetically actuated Switching element opens the electrical contact and thereby the control device of the high-pressure cleaning device receives the information that there is only an insufficient flow rate and therefore the heat exchanger must be turned off. Otherwise, there is a risk that the thermal energy provided by the heat exchanger is dissipated only insufficiently or not at all. This can lead to overheating of the heat exchanger.

Strömungsschalter der eingangs genannten Art sind aus der DE 90 11 336 U1 bekannt. Sie unterliegen während des Betriebes einer beträchtlichen mechanischen Belastung, da die den Strömungskanal durchströmende Flüssigkeit in vielen Fällen einen Druck von über 200 bar, beispielsweise einen Druck von 250 bar aufweist und häufig Schmutzpartikel mit sich führt. Die mitgeführten Schmutzpartikel können zu einer Beeinträchtigung des Strömungsschalters führen, insbesondere können von der Flüssigkeit mitgeführte Schmutzpartikel zu einer Beeinträchtigung der Beweglichkeit des Schaltkörpers führen.Flow switch of the type mentioned are from the DE 90 11 336 U1 known. They are subject during operation of a considerable mechanical load, since the liquid flowing through the flow channel in many cases has a pressure of over 200 bar, for example, a pressure of 250 bar and often carries dirt particles with it. The entrained dirt particles can lead to an impairment of the flow switch, in particular can lead from the liquid entrained dirt particles to an impairment of the mobility of the switch body.

Aus dem Dokument DE 39 41 981 A1 ist ein Strömungsschalter mit den Merkmalen des Oberbegriffes von Patentanspruch 1 bekannt. Der Strömungsschalter weist einen von einer Flüssigkeit durchströmbaren Strömungskanal mit einem Flüssigkeitseinlass und einem Flüssigkeitsauslass auf. Im Strömungskanal ist ein von der Flüssigkeit strömungsabhängig verschiebbarer, permanent magnetisierter Schaltkörper angeordnet. Außerdem weist der Strömungsschalter ein in Abhängigkeit von der Stellung des Schaltkörpers magnetisch betätigbares Schaltelement auf. Im Strömungskanal ist ein Innenrohr angeordnet, das den verschiebbaren Schaltkörper aufnimmt und eine mit dem Flüssigkeitseinlass in Strömungsverbindung stehende Zuflussöffnung sowie eine erste und eine zweite Abflussöffnung aufweist. Das Innenrohr ist von einem Ringraum umgeben, der mit dem Flüssigkeitsauslass in Strömungsverbindung steht, und die zweite Abflussöffnung ist axial versetzt zu der ersten Abflussöffnung angeordnet. Die erste Abflussöffnung mündet in den Ringraum. Sie ist in Form eines Längsschlitzes ausgebildet, der sich in der Wandung des Innenrohrs entlang von dessen Längsachse erstreckt. Durch den Längsschlitz hindurch kann Flüssigkeit aus dem Innenrohr herausströmen und es kann auch Flüssigkeit in das Innenrohr hineinströmen.From the document DE 39 41 981 A1 a flow switch with the features of the preamble of claim 1 is known. The flow switch has a liquid flow-through flow channel with a liquid inlet and a liquid outlet. In the flow channel, a flow-dependent displaceable, permanently magnetized switching body is arranged by the liquid. In addition, the flow switch on a function of the position of the switch body magnetically actuated switching element. An inner tube is arranged in the flow channel, which accommodates the displaceable switching body and has a feed opening in fluid communication with the liquid inlet and also has a first and a second outflow opening. The inner tube is surrounded by an annular space which is in fluid communication with the liquid outlet, and the second discharge opening is arranged axially offset from the first discharge opening. The first drain opens into the annulus. It is in the form of a longitudinal slot which extends in the wall of the inner tube along its longitudinal axis. By the Through the longitudinal slot, liquid can flow out of the inner tube and liquid can also flow into the inner tube.

Aufgabe der vorliegenden Erfindung ist es, einen Strömungsschalter der eingangs genannten Art derart weiterzubilden, dass er unempfindlicher ist gegenüber Schmutzpartikel, die von der Flüssigkeit mitgeführt werden.Object of the present invention is to develop a flow switch of the type mentioned in such a way that it is less sensitive to dirt particles that are carried by the liquid.

Diese Aufgabe wird durch einen Strömungsschalter mit den Merkmalen von Patentanspruch 1 gelöst.This object is achieved by a flow switch with the features of claim 1.

Im Strömungskanal des erfindungsgemäßen Strömungsschalters ist ein Innenrohr angeordnet, das den von der Flüssigkeit strömungsabhängig verschiebbaren Schaltkörper aufnimmt und das von einem Ringraum umgeben ist. Über eine Zuflussöffnung steht das Innenrohr mit dem Flüssigkeitseinlass des Strömungsschalters in Strömungsverbindung, so dass Flüssigkeit über die Zuflussöffnung in das Innenrohr einströmen kann. Über in Bezug auf die Längsachse des Innenrohrs axial versetzt zueinander angeordnete erste und zweite Abflussöffnungen kann die Flüssigkeit aus dem Innenrohr in den Ringraum strömen, der mit dem Flüssigkeitsauslass in Strömungsverbindung steht. Es hat sich überraschenderweise gezeigt, dass durch eine derartige Ausgestaltung des Strömungsschalters dessen Anfälligkeit gegenüber Schmutzpartikel deutlich verringert werden kann. Weist die Flüssigkeit eine einen Grenzwert überschreitende Strömungsrate auf, so wird der Schaltkörper im Innenrohr aus seiner Ruhestellung in seine Schaltstellung verschoben. Ein Teil der in das Innenrohr eintretenden Flüssigkeit strömt über die mindestens eine erste Abflussöffnung aus dem Innenrohr heraus und der restliche Teil der Flüssigkeit durchströmt das Innenrohr in Richtung seiner Längsachse bis zu der mindestens einen zweiten Abflussöffnung, wobei dieser Teil der Flüssigkeit am Schaltkörper entlangströmt. Die Flüssigkeit gelangt über die mindestens eine erste Abflussöffnung und die mindestens eine zweite Abflussöffnung in den Ringraum, der das Innenrohr in Umfangsrichtung umgibt und der mit dem Flüssigkeitsauslass in Strömungsverbindung steht. Die Aufteilung der Flüssigkeit im Innenrohr in erste und zweite Teilströme, die das Innenrohr über unterschiedliche Strömungswege durchströmen und dann über die ersten und zweiten Abflussöffnungen in den Ringraum gelangen, verringert die Gefahr von Schmutzpartikelablagerungen im Bereich des Schaltkörpers, so dass dessen Beweglichkeit von Schmutzpartikeln weniger beeinträchtigt wird.In the flow channel of the flow switch according to the invention, an inner tube is arranged, which is the fluid-dependent displaced by the liquid Switch body receives and is surrounded by an annulus. The inner tube is in fluid communication with the liquid inlet of the flow switch via an inflow opening, so that liquid can flow into the inner tube via the inflow opening. By way of the first and second outflow openings arranged axially offset with respect to the longitudinal axis of the inner tube, the liquid can flow out of the inner tube into the annular space, which is in flow connection with the liquid outlet. It has surprisingly been found that its susceptibility to dirt particles can be significantly reduced by such a design of the flow switch. If the liquid has a flow rate exceeding a limit value, the switch body in the inner tube is displaced from its rest position into its switching position. A part of the liquid entering the inner tube flows out of the inner tube via the at least one first outflow opening and the remaining part of the liquid flows through the inner tube in the direction of its longitudinal axis up to the at least one second outflow opening, whereby this part of the liquid flows along the switching element. The liquid passes via the at least one first outflow opening and the at least one second outflow opening into the annular space which surrounds the inner tube in the circumferential direction and which is in flow connection with the liquid outlet. The division of the liquid in the inner tube into first and second partial flows, which flow through the inner tube via different flow paths and then pass through the first and second discharge openings in the annular space, reduces the risk of dirt particles deposits in the switch body, so that its mobility less affected by dirt particles becomes.

Günstig ist es, wenn die Zuflussöffnung des Innenrohrs an einer ersten, dem Flüssigkeitseinlass zugewandten Innenrohrstirnseite angeordnet ist. Bei einer derartigen Ausgestaltung tritt die Flüssigkeit bezogen auf die Längsachse des Innenrohrs in axialer Richtung in das Innenrohr ein und kann dieses zumindest bis zum Erreichen der mindestens einen ersten Abflussöffnung in axialer Richtung durchströmen. Die Flüssigkeit kann hierbei auf eine Stirnseite des Schaltkörpers auftreffen und diesen in axialer Richtung verschieben.It is advantageous if the inflow opening of the inner tube is arranged on a first, the liquid inlet facing inner tube end face. In such an embodiment, the liquid enters into the inner tube in the axial direction relative to the longitudinal axis of the inner tube and can flow through it in the axial direction at least until it reaches the at least one first outflow opening. The liquid can impinge on an end face of the switch body and move it in the axial direction.

Bei einer vorteilhaften Ausführungsform sind die mindestens eine erste Abflussöffnung und die mindestens eine zweite Abflussöffnung an einem Mantel des Innenrohrs angeordnet. Die Flüssigkeit verlässt somit das Innenrohr über die ersten und zweiten Abflussöffnungen in radialer Richtung.In an advantageous embodiment, the at least one first outlet opening and the at least one second outlet opening are arranged on a jacket of the inner tube. The liquid thus leaves the inner tube via the first and second outflow openings in the radial direction.

Der permanent magnetisierte Schaltkörper wird beim Einströmen von unter Druck stehender Flüssigkeit schlagartig von seiner Ruhestellung in seine Schaltstellung verschoben. Hierbei besteht die Gefahr, dass er von der Flüssigkeit gegen eine mechanische Anschlagfläche gedrückt wird und dadurch einer erheblichen Stoßbelastung unterliegt. Dies könnte zur Folge haben, dass sich der Schaltkörper entmagnetisiert. Um dieser Gefahr entgegenzuwirken, ist bei einer besonders bevorzugten Ausgestaltung der Erfindung eine zweite, dem Flüssigkeitseinlass abgewandte Innenrohrseite geschlossen und die mindestens eine zweite Abflussöffnung ist axial versetzt zur zweiten Innenrohrstirnseite angeordnet. Eine derartige Ausgestaltung hat zur Folge, dass sich im Bereich zwischen der mindestens einen zweiten Abflussöffnung und der zweiten Innenrohrstirnseite Flüssigkeit sammelt, die den Schaltkörper bei seiner Bewegung in Richtung auf die zweite Innenrohrstirnseite abbremst und dadurch verhindert, dass der Schaltkörper schlagartig gegen eine Anschlagfläche stößt. Die Flüssigkeit zwischen der mindestens einen zweiten Abflussöffnung und der zweiten Innenrohrstirnseite bildet somit eine Dämpfung für den Schaltkörper. Die Gefahr, dass dieser durch Stoßbelastung entmagnetisiert wird, ist dadurch sehr gering.The permanently magnetized switch body is abruptly moved from its rest position into its switching position when flowing liquid under pressure. In this case, there is a risk that he is pressed by the liquid against a mechanical stop surface and thereby subject to considerable shock load. This could result in the switch body becoming demagnetized. To counteract this danger, in a particularly preferred embodiment of the invention, a second, the liquid inlet facing away from the inner tube side is closed and the at least one second discharge opening is axially offset from the second inner tube end face. Such a configuration has the consequence that in the area between the at least one second drain opening and the second inner tube end side fluid collects, which slows down the switch body in its movement toward the second inner tube end face and thereby prevents the switch body abruptly abuts against a stop surface. The liquid between the at least one second outflow opening and the second inner tube end face thus forms a damping for the switch body. The risk that this is demagnetized by impact load, this is very low.

Von Vorteil ist es, wenn der Strömungskanal von einem Außenrohr gebildet wird, das koaxial zum Innenrohr ausgerichtet ist, wobei der Flüssigkeitsauslass im Bereich eines Rohrmantels des Außenrohrs angeordnet ist und wobei die mindestens eine erste Abflussöffnung in Höhe des Flüssigkeitsauslasses positioniert ist. Bei einer derartigen Ausgestaltung kann der die mindestens eine erste Abflussöffnung durchströmende Teil der Flüssigkeit den sich an die erste Abflussöffnung anschießenden Ringraum in radialer Richtung durchströmen, um dann zum Flüssigkeitsauslass des Strömungsschalters zu gelangen. Dadurch kann der Strömungswiderstand, den der Strömungsschalter der Flüssigkeit entgegensetzt, gering gehalten werden.It is advantageous if the flow channel is formed by an outer tube which is aligned coaxially with the inner tube, wherein the liquid outlet is arranged in the region of a tubular jacket of the outer tube and wherein the at least one first discharge opening is positioned at the level of the liquid outlet. In such a configuration, the part of the liquid flowing through the at least one first discharge opening can flow in the radial direction through the annulus adjoining the first discharge opening, in order then to reach the liquid outlet of the flow switch. Thereby For example, the flow resistance that the flow switch opposes to the liquid can be kept low.

Der Flüssigkeitseinlass ist bei einer vorteilhaften Ausführungsform der Erfindung an einer ersten Außenrohrstirnseite angeordnet.The liquid inlet is arranged in an advantageous embodiment of the invention on a first outer tube end face.

Günstigerweise ist die erste Außenrohrstirnseite mit einer Einlassleitung verbunden. Das Außenrohr und die Einlassleitung bilden vorzugsweise eine einteilige Leitungsanordnung aus. Günstig ist es, wenn das Außenrohr senkrecht zur Einlassleitung ausgerichtet ist.Conveniently, the first outer tube end face is connected to an inlet line. The outer tube and the inlet line preferably form a one-piece line arrangement. It is favorable if the outer tube is aligned perpendicular to the inlet line.

Eine zweite, dem Flüssigkeitseinlass abgewandte Außenrohrstirnseite ist bei einer vorteilhaften Ausführungsform mittels eines Stopfens geschlossen, wobei innerhalb des Außenrohrs am Stopfen ein Schließelement des Innenrohrs angeordnet ist. Der Stopfen kann somit eine Stütze für das Schließelement bilden.A second, the liquid inlet facing away from the outer tube end side is closed in an advantageous embodiment by means of a plug, wherein a closing element of the inner tube is disposed within the outer tube to the plug. The plug can thus form a support for the closing element.

Der Stopfen ist bei einer bevorzugten Ausgestaltung der Erfindung mit dem Außenrohr lösbar verbindbar. Insbesondere kann vorgesehen sein, dass der Stopfen in das Außenrohr eingeschraubt werden kann.The plug is releasably connectable in a preferred embodiment of the invention with the outer tube. In particular, it can be provided that the plug can be screwed into the outer tube.

Der axiale Abstand zwischen der mindestens einen ersten Abflussöffnung und der mindestens einen zweiten Abflussöffnung entspricht bei einer besonders bevorzugten Ausgestaltung der Erfindung zumindest der Länge des Schaltkörpers. Wird der Strömungsschalter bei einer derartigen Ausgestaltung von unter Druck stehender Flüssigkeit durchströmt, so nimmt er selbsttätig eine Schaltstellung zwischen der mindestens einen ersten Abflussöffnung und der mindestens einen zweiten Abflussöffnung ein, sofern die Strömungsrate der Flüssigkeit einen Grenzwert überschreitet. Ein Teil der Flüssigkeit kann von einer Stirnseite des Schaltkörpers in Richtung auf die mindestens eine erste Abflussöffnung umgelenkt werden, und der restliche Teil der Flüssigkeit kann den Schaltkörper im Innenrohr in Längsrichtung umströmen und stromabwärts des Schaltkörpers zur mindestens einen zweiten Abflussöffnung gelangen. Die Lage der ersten und zweiten Abflussöffnungen gibt bei einer derartigen Ausgestaltung die Schaltstellung des Schaltkörpers vor, da dieser eine Position zwischen der mindestens einen ersten Abflussöffnung und der mindestens einen zweiten Abflussöffnung einnimmt, sofern seine axiale Erstreckung nicht größer ist als der axiale Abstand zwischen der mindestens einen ersten Abflussöffnung und der mindestens einen zweiten Abflussöffnung.The axial distance between the at least one first outlet opening and the at least one second outlet opening corresponds in a particularly preferred embodiment of the invention at least the length of the switch body. If the flow switch flows through such a configuration of pressurized liquid, it automatically assumes a switching position between the at least one first drain opening and the at least one second drain opening, if the flow rate of the liquid exceeds a limit. A part of the liquid can be deflected from one end face of the switch body in the direction of the at least one first discharge opening, and the remaining part of the liquid can flow around the switch body in the inner tube in the longitudinal direction and reach the at least one second discharge opening downstream of the switch body. The Position of the first and second outflow openings are in such an embodiment, the switching position of the switch body, since this assumes a position between the at least one first drain opening and the at least one second drain opening, provided that its axial extent is not greater than the axial distance between the at least one first drain opening and the at least one second drain opening.

Bevorzugt ist die Summe der Strömungsquerschnitte der ersten Abflussöffnungen kleiner als die Summe der Strömungsquerschnitte der zweiten Abflussöffnungen. Dies stellt sicher, dass ein größerer Teil der Flüssigkeit das Innenrohr entlang des Schaltkörpers bis zu der mindestens einen zweiten Abflussöffnung durchströmt und lediglich ein kleinerer Teil der Flüssigkeit aus dem Innenrohr über die mindestens eine erste Abflussöffnung herausströmt.Preferably, the sum of the flow cross sections of the first outflow openings is smaller than the sum of the flow cross sections of the second outflow openings. This ensures that a larger part of the liquid flows through the inner tube along the switch body as far as the at least one second discharge opening and only a smaller part of the liquid flows out of the inner tube via the at least one first discharge opening.

Es kann beispielsweise vorgesehen sein, dass die Summe der Strömungsquerschnitte der ersten Abflussöffnungen halb so groß ist wie die Summe der Strömungsquerschnitte der zweiten Abflussöffnungen.It can be provided, for example, that the sum of the flow cross sections of the first outflow openings is half as large as the sum of the flow cross sections of the second outflow openings.

Bei einer vorteilhaften Ausführungsform weist der Strömungsschalter eine einzige erste Abflussöffnung auf. Bevorzugt ist die einzige erste Abflussöffnung bezogen auf die Längsachse des Innenrohrs in Höhe des Flüssigkeitsauslasses angeordnet. Von Vorteil ist es, wenn die einzige erste Abflussöffnung in Umfangsrichtung des Innenrohrs versetzt zum Flüssigkeitsauslass positioniert ist. Besonders günstig ist es, wenn die einzige erste Abflussöffnung in Umfangsrichtung des Innenrohrs um einen Winkel zwischen 10° und 45° versetzt zum Flüssigkeitsauslass angeordnet ist.In an advantageous embodiment, the flow switch has a single first outlet opening. Preferably, the single first discharge opening is arranged at the level of the liquid outlet with respect to the longitudinal axis of the inner pipe. It is advantageous if the single first outlet opening is positioned offset in the circumferential direction of the inner tube to the liquid outlet. It is particularly favorable if the single first outflow opening is arranged in the circumferential direction of the inner tube offset by an angle between 10 ° and 45 ° to the liquid outlet.

Bei einer vorteilhaften Ausgestaltung weist das Innenrohr zwei zweite Abflussöffnungen auf, die bezogen auf die Längsachse des Innenrohrs auf gleicher Höhe angeordnet sind. In Umfangsrichtung sind die beiden zweiten Abflussöffnungen bei einer vorteilhaften Ausgestaltung der Erfindung um weniger als 180° zueinander versetzt angeordnet, beispielsweise um einen Winkel von 60° bis 120°.In an advantageous embodiment, the inner tube has two second outflow openings, which are arranged at the same height relative to the longitudinal axis of the inner tube. In the circumferential direction, the two second outflow openings are arranged offset in an advantageous embodiment of the invention by less than 180 ° to each other, for example, at an angle of 60 ° to 120 °.

Der Strömungsquerschnitt der beiden zweiten Abflussöffnungen ist günstigerweise jeweils identisch mit dem Strömungsquerschnitt der einzigen ersten Abflussöffnung.The flow cross section of the two second outflow openings is favorably identical to the flow cross section of the single first outflow opening.

Von Vorteil ist es, wenn der Schaltkörper im Innenrohr von einem Ringspalt umgeben ist, dessen radiale Ausdehnung mindestens 0,5 mm beträgt. Vorzugsweise beträgt die radiale Ausdehnung des den Schaltkörper umgebenden Ringspaltes mindestens 0,8 mm. Die Gefahr, dass die Beweglichkeit durch von der Flüssigkeit mitgeführte Schmutzpartikel beeinträchtigt wird, kann dadurch besonders gering gehalten werden.It is advantageous if the switch body in the inner tube is surrounded by an annular gap whose radial extent is at least 0.5 mm. Preferably, the radial extent of the annular gap surrounding the switching body is at least 0.8 mm. The risk that the mobility is affected by entrained by the liquid dirt particles can be kept very low.

Die radiale Ausdehnung des das Innenrohr umgebenden Ringraumes beträgt bevorzugt mindestens 0,5 mm, insbesondere mindestens 0,8 mm.The radial extent of the annular space surrounding the inner tube is preferably at least 0.5 mm, in particular at least 0.8 mm.

Die nachfolgende Beschreibung einer vorteilhaften Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine schematische Schnittansicht einer vorteilhaften Ausführungsform eines erfindungsgemäßen Strömungsschalters, wobei dessen Schaltkörper eine Ruhestellung einnimmt, und
Figur 2:
eine schematische Schnittansicht des Strömungsschalters aus Figur 1, wobei der Schaltkörper eine Schaltstellung einnimmt.
The following description of an advantageous embodiment of the invention is used in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a schematic sectional view of an advantageous embodiment of a flow switch according to the invention, wherein the switching body assumes a rest position, and
FIG. 2:
a schematic sectional view of the flow switch FIG. 1 , wherein the switch body assumes a switching position.

In der Zeichnung ist schematisch eine bevorzugte Ausführungsform eines erfindungsgemäßen Strömungsschalters in seiner Gebrauchslage dargestellt, der insgesamt mit dem Bezugszeichen 10 belegt ist. Er umfasst eine als horizontal ausgerichtetes Rohrstück ausgebildete Eingangsleitung 12, an die sich ein vertikal ausgerichtetes Außenrohr 14 anschließt, dessen Längsachse 15 senkrecht zur Längsachse 16 der Eingangsleitung ausgerichtet ist. Im Übergangsbereich zwischen der Eingangsleitung 12 und dem Außenrohr 14 definiert das Außenrohr 14 eine erste Außenrohrstirnseite 18, die einen Flüssigkeitseinlass 20 aufweist, über die eine Flüssigkeit, die beispielsweise von der Pumpe eines Hochdruckreinigungsgerätes unter Druck gesetzt wurde, in das Außenrohr 14 einströmen kann. Eine der Eingangsleitung 12 abgewandte zweite Außenrohrstirnseite 22 ist von einem Stopfen 24 verschlossen, der in das Außenrohr 14 eingeschraubt werden kann.In the drawing, a preferred embodiment of a flow switch according to the invention is shown schematically in its position of use, which is generally occupied by the reference numeral 10. It comprises an input line 12 designed as a horizontally oriented tube piece, to which a vertically aligned outer tube 14 adjoins, whose longitudinal axis 15 is aligned perpendicular to the longitudinal axis 16 of the input line. In the transition region between the input line 12 and the outer tube 14 defines the outer tube 14 a first outer tube end face 18, which has a liquid inlet 20, via which a liquid which has been pressurized by the pump of a high-pressure cleaning device, for example, can flow into the outer tube 14. One of the input line 12 facing away from the second outer tube end face 22 is closed by a plug 24 which can be screwed into the outer tube 14.

Zwischen der ersten Außenrohrstirnseite 18 und der zweiten Außenrohrstirnseite 22 erstreckt sich ein zylindrischer Außenrohrmantel 26, der in Richtung der Längsachse 15 des Außenrohrs 14 versetzt zur Längsachse 16 der Eingangsleitung 12 einen Flüssigkeitsauslass 28 aufweist, an den ein Auslassstutzen 30 angeformt ist. An den Auslassstutzen 30 ist ein in der Zeichnung nur teilweise dargestelltes Auslassrohr 32 angeschlossen, über das die Flüssigkeit einem Durchlauferhitzer eines Hochdruckreinigungsgerätes zugeführt werden kann.Extending between the first outer tube end face 18 and the second outer tube end face 22 is a cylindrical outer tube jacket 26 which, in the direction of the longitudinal axis 15 of the outer tube 14 offset from the longitudinal axis 16 of the input line 12, has a liquid outlet 28 to which an outlet nozzle 30 is integrally formed. To the outlet port 30 a in the drawing only partially shown outlet pipe 32 is connected, via which the liquid can be supplied to a water heater of a high-pressure cleaner.

Zwischen dem Flüssigkeitseinlass 20 und dem Stopfen 24 definiert das Außenrohr 14 einen Strömungskanal 34, in dem ein Innenrohr 36 angeordnet ist. Das Innenrohr 36 ist im Strömungskanal 34 von einem Ringraum 38 umgeben und weist an einer ersten Innenrohrstirnseite 40 eine Zuflussöffnung 42 auf, wohingegen eine dem Flüssigkeitseinlass 20 abgewandte zweite Innenrohrstirnseite 44 mittels eines Schließkörpers 46 verschlossen ist, der sich am Stopfen 24 in axialer Richtung abstützt.Between the liquid inlet 20 and the plug 24, the outer tube 14 defines a flow channel 34 in which an inner tube 36 is arranged. The inner tube 36 is surrounded in the flow channel 34 by an annular space 38 and has a first inner tube end face 40 an inflow opening 42, whereas a liquid inlet 20 facing away from the second Innenrohrstirnseite 44 is closed by a closing body 46 which is supported on the plug 24 in the axial direction.

Zwischen der ersten Innenrohrstirnseite 40 und der zweiten Innenrohrstirnseite 44 erstreckt sich ein zylindrischer Innenrohrmantel 47. Ungefähr in Höhe des Flüssigkeitsauslasses 28 weist der Innenrohrmantel 47 eine einzige erste Abflussöffnung 48 auf, die in Umfangsrichtung des Innenrohrs 36 um einen Winkel von etwa 45° zum Flüssigkeitsauslass 28 versetzt positioniert ist.Between the first inner tube end face 40 and the second inner tube end face 44, a cylindrical inner tube jacket 47 extends. Approximately at the level of the liquid outlet 28, the inner tube jacket 47 has a single first discharge opening 48 which is at an angle of approximately 45 ° to the liquid outlet 28 in the circumferential direction of the inner tube 36 is positioned offset.

Bezogen auf die Längsachse 15 des Außenrohrs 14 in Richtung auf den Schließkörper 46 versetzt zur ersten Abflussöffnung 28 weist der Innenrohrmantel 47 zwei zweite Abflussöffnungen 50, 51 auf, die bezogen auf die Längsachse 15 auf gleicher Höhe und in Umfangsrichtung des Innenrohrs 36 um einen Winkel von weniger als 180°, im dargestellten Ausführungsbeispiel um einen Winkel von etwa 90° zueinander versetzt angeordnet sind. Die erste Abflussöffnung 48 mündet ebenso wie die beiden zweiten Abflussöffnungen 50, 51 in den Ringraum 48, der das Innenrohr 36 in Umfangsrichtung umgibt.Relative to the longitudinal axis 15 of the outer tube 14 in the direction of the closing body 46 offset from the first outflow opening 28, the inner tube jacket 47 has two second outflow openings 50, 51, which, based on the Longitudinal axis 15 at the same height and in the circumferential direction of the inner tube 36 by an angle of less than 180 °, are offset in the illustrated embodiment by an angle of about 90 ° to each other. The first outflow opening 48 opens as well as the two second outflow openings 50, 51 in the annular space 48 which surrounds the inner tube 36 in the circumferential direction.

Im Innenrohr 36 ist ein permanent magnetisierter Schaltkörper in Form eines Permanentmagneten 54 verschiebbar angeordnet. Der Permanentmagnet 54 ist zylindrisch ausgestaltet und über seine gesamte Länge von einem Ringspalt 56 umgeben, der sich zwischen dem Permanentmagneten 54 und dem Innenrohr 36 erstreckt.In the inner tube 36, a permanently magnetized switch body in the form of a permanent magnet 54 is slidably disposed. The permanent magnet 54 is cylindrical and surrounded over its entire length by an annular gap 56 which extends between the permanent magnet 54 and the inner tube 36.

Der Permanentmagnet 54 wirkt mit einem an der Außenseite des Außenrohrs 14 angeordneten, magnetisch betätigbaren Schaltelement in Form eines Reedkontaktes zusammen. Mit Hilfe des Reedkontaktes 58 kann in Abhängigkeit von der Stellung des Permanentmagneten 54 einer Steuereinrichtung eines Hochdruckreinigungsgerätes ein elektrisches Signal bereitgestellt werden.The permanent magnet 54 cooperates with a magnetically actuated switching element in the form of a reed contact arranged on the outside of the outer tube 14. With the help of the reed contact 58, depending on the position of the permanent magnet 54 of a control device of a high-pressure cleaning device, an electrical signal can be provided.

Über die Eingangsleitung 12, den Flüssigkeitseinlass 20 und die Zuflussöffnung 42 kann unter Druck stehende Flüssigkeit, vorzugsweise Wasser, in vertikaler Richtung nach oben in das Innenrohr 36 einströmen. Erreicht die Strömungsrate der einströmenden Flüssigkeit einen vorgegebenen Grenzwert, so wird der Permanentmagnet 54 entgegen seiner Gewichtskraft aus seiner in Figur 1 dargestellten Ruhestellung vertikal nach oben in seine in Figur 2 dargestellte Schaltstellung verschoben. In der Schaltstellung nimmt der Permanentmagnet 54 eine Position zwischen der ersten Abflussöffnung 48 und den beiden zweiten Abflussöffnungen 50, 51 ein und der Reedkontakt wird vom Permanentmagneten geschlossen. Die Länge des Permanentmagneten 54 ist geringer als der axiale Abstand, den der Mittelpunkt der ersten Abflussöffnung 48 zu den Mittelpunkten der zweiten Abflussöffnungen 50 und 51 einnimmt. Ein Teil der in das Innenrohr 36 einströmenden Flüssigkeit kann über die unmittelbar unterhalb des in der Schaltstellung befindlichen Permanentmagneten 54 angeordnete erste Abflussöffnung 48 und den Ringraum 38 zum Flüssigkeitsauslass 28 strömen, und der restliche Teil der in das Innenrohr 36 einströmenden Flüssigkeit strömt in vertikaler Richtung durch den Ringspalt 56 entlang des Permanentmagneten 54 nach oben bis zu dessen dem Schließkörper 56 zugewandter oberer Stirnseite, um dann über die zweiten Abflussöffnungen 50, 51 in radialer Richtung aus dem Innenrohr 36 herauszuströmen und anschließend den das Innenrohr 36 umgebenden Ringraum 38 in vertikaler Richtung bis zum Flüssigkeitsauslass 28 zu durchströmen.Via the input line 12, the liquid inlet 20 and the inflow opening 42, pressurized liquid, preferably water, can flow upward into the inner tube 36 in a vertical direction. If the flow rate of the inflowing liquid reaches a predetermined limit value, the permanent magnet 54, contrary to its weight, is released from its in FIG. 1 illustrated rest position vertically upwards in his in FIG. 2 shifted switching position shown. In the switching position, the permanent magnet 54 assumes a position between the first outflow opening 48 and the two second outflow openings 50, 51 and the reed contact is closed by the permanent magnet. The length of the permanent magnet 54 is less than the axial distance occupied by the center of the first drain opening 48 to the centers of the second drain openings 50 and 51. A portion of the liquid flowing into the inner tube 36 can flow via the first outflow opening 48 arranged immediately below the permanent magnet 54 located in the switching position and the annular space 38 to the liquid outlet 28 flow, and the remaining part of the flowing into the inner tube 36 liquid flows in a vertical direction through the annular gap 56 along the permanent magnet 54 up to its closing body 56 facing upper end side, and then via the second discharge openings 50, 51 in the radial direction flow out of the inner tube 36 and then to flow through the inner tube 36 surrounding annular space 38 in the vertical direction to the liquid outlet 28.

Zwischen den beiden Abflussöffnungen 50, 51 und dem Schließkörper 46 sammelt sich Flüssigkeit, die verhindert, dass der Permanentmagnet 54 beim Verschieben aus der Ruhestellung auf den Schließkörper 46 aufprallt. Vielmehr wird der Permanentmagnet 54 von der den Strömungsschalter 10 durchströmenden Flüssigkeit zuverlässig in seiner in Figur 2 dargestellten Schaltstellung gehalten, indem er in reproduzierbarer Weise eine Position zwischen der ersten Abflussöffnung 48 und den beiden zweiten Abflussöffnungen 50, 51 einnimmt.Liquid collects between the two drainage openings 50, 51 and the closing body 46, which prevents the permanent magnet 54 from striking the closing body 46 when it is displaced from the rest position. Rather, the permanent magnet 54 of the liquid flowing through the flow switch 10 reliably in its in FIG. 2 illustrated switch position by occupying a position between the first drain opening 48 and the two second drain openings 50, 51 in a reproducible manner.

Der den Permanentmagneten 54 in Umfangsrichtung umgebende Ringspalt 56 weist in radialer Richtung eine Ausdehnung von mehr als 0,5 mm, insbesondere mindestens 0,8 mm auf. Die radiale Ausdehnung des Ringraumes 38 beträgt ebenfalls mindestens 0,5 mm, insbesondere mindestens 0,8 mm. Dies stellt sicher, dass sich im Ringspalt 56 und im Ringraum 38 praktisch keine Schmutzpartikel ansammeln, die von der unter Druck stehenden Flüssigkeit mitgeführt werden.The annular gap 56 surrounding the permanent magnets 54 in the circumferential direction has an extent of more than 0.5 mm, in particular at least 0.8 mm, in the radial direction. The radial extent of the annular space 38 is also at least 0.5 mm, in particular at least 0.8 mm. This ensures that accumulate in the annular gap 56 and the annular space 38 virtually no dirt particles that are carried by the pressurized fluid.

Wird der Flüssigkeitsstrom unterbrochen, so geht der Permanentmagnet 54 aufgrund seiner Gewichtskraft selbsttätig in seine in Figur 1 dargestellte Ruhestellung über, so dass der Reedkontakt 58 selbsttätig seine Offenstellung einnimmt.If the liquid flow is interrupted, then the permanent magnet 54 goes into its own due to its weight FIG. 1 shown rest position, so that the reed contact 58 automatically assumes its open position.

Der Strömungsschalter 10 stellt der Flüssigkeit verhältnismäßig große Ringspalte und Ringräume zur Verfügung und zeichnet sich durch einen reproduzierbaren Schaltpunkt des Reedkontaktes 58 bei einer durch die Dimensionierung des Strömungsschalters 10 vorgebbaren Strömungsrate der Flüssigkeit aus. Tritt erstmalig unter Druck stehende Flüssigkeit in den Strömungsschalter 10 ein, so geht der Permanentmagnet 34 von seiner Ruhestellung in seine Schaltstellung über ohne dass die Gefahr besteht, dass der Permanentmagnet 54 gegen den Schließkörper 46 stößt und dadurch einer starken mechanischen Belastung unterliegt, die zu einer Entmagnetisierung des Permanentmagneten 54 führen könnte. Aufgrund der verhältnismäßig großen Ringspalte und Ringräume weist der Strömungsschalter 10 nur einen verhältnismäßig geringen Strömungswiderstand auf, so dass die den Strömungsschalter 10 durchströmende Flüssigkeit nur einem geringen Druckabfall unterliegt.The flow switch 10 provides the liquid relatively large annular gaps and annular spaces available and is characterized by a reproducible switching point of the reed contact 58 at a by the dimensioning of the flow switch 10 predetermined flow rate of the liquid. Occurs for the first time under pressure fluid in the flow switch 10, so the permanent magnet 34 goes from its rest position to its switching position without the risk that the permanent magnet 54 abuts against the closing body 46 and thereby subject to a strong mechanical stress, which is a Demagnetization of the permanent magnet 54 could lead. Due to the relatively large annular gaps and annular spaces, the flow switch 10 only has a relatively low flow resistance, so that the liquid flowing through the flow switch 10 is subject to only a small pressure drop.

Wie bereits erwähnt, eignet sich der Strömungsschalter 10 insbesondere zur Verwendung in einem beheizbaren Hochdruckreinigungsgerät, wobei er in die Strömungsverbindung zwischen dessen Pumpe und dessen Durchlauferhitzer geschaltet wird.As already mentioned, the flow switch 10 is particularly suitable for use in a heatable high-pressure cleaning device, wherein it is switched into the flow connection between the pump and the water heater.

Claims (14)

  1. A flow switch having a flow channel (34), able to be flowed through by a fluid, which has a fluid inlet (20) and a fluid outlet (28) and in which there is arranged a permanently magnetized switching body (54) displaceable by the fluid in a flow-dependent manner, and having a switching element (58) magnetically actuatable dependent on the position of the switching body (54), wherein an inner pipe (36) surrounded by an annular space (38) is arranged in the flow channel (34), which inner pipe (36) receives the displaceable switching body (54) and has an inflow opening (42), in a flow connection with the flow inlet (20), and at least one first and at least one second outflow opening (48, 50, 51), wherein the at least one second outflow opening (50, 51) is arranged axially offset in relation to the at least one first outflow opening (48) and the at least one first outflow opening (48) opens into the annular space, and wherein the annular space (38) is in a flow connection with the fluid outlet (28), characterized in that the at least one second outflow opening (50, 51) also opens into the annular space (38).
  2. A flow switch according to claim 1, characterized in that the inflow opening (42) is arranged at a first inner pipe end face (40) facing the fluid inlet (20).
  3. A flow switch according to claim 1 or 2, characterized in that the first and second outflow openings (48, 50, 51) are arranged at an inner pipe shell (47).
  4. A flow switch according to any one of the preceding claims, characterized in that a second inner pipe end face (44) remote from the fluid inlet (20) is closed and the at least one second outflow opening (50, 51) is arranged axially offset in relation to the second inner pipe end face (44).
  5. A flow switch according to any one of the preceding claims, characterized in that the flow channel (34) is formed by an outer pipe (14) oriented coaxially with the inner pipe (36), wherein the fluid outlet (38) is arranged in the region of an outer pipe shell (26) and the at least one first outflow opening (48) is positioned level with the fluid outlet (28).
  6. A flow switch according to claim 5, characterized in that the fluid inlet (20) is arranged at a first outer pipe end face (18).
  7. A flow switch according to claim 6, characterized in that the first outer pipe end face (18) is connected to an inlet line (12).
  8. A flow switch according to claim 5, 6 or 7, characterized in that a second outer pipe end face (22) remote from the fluid inlet (20) is closed by means of a plug (24), wherein within the outer pipe (14), a closing element (46) of the inner pipe (36) is arranged against the plug (24).
  9. A flow switch according to any one of the preceding claims, characterized in that the axial distance between the at least one first outflow opening (48) and the at least one second outflow opening (50, 51) corresponds at least to the length of the switching body (54).
  10. A flow switch according to any one of the preceding claims, characterized in that the sum of the flow cross-sections of the first outflow openings (48) is smaller than the sum of the flow cross-sections of the second outflow openings (50, 51).
  11. A flow switch according to claim 10, characterized in that the sum of the flow cross-sections of the first outflow openings (48) is half as great as the sum of the flow cross-sections of the second outflow openings (50, 51).
  12. A flow switch according to any one of the preceding claims, characterized in that the inner pipe (36) has a single first outflow opening (48).
  13. A flow switch according to any one of the preceding claims, characterized in that the inner pipe (36) has two second outflow openings (50, 51).
  14. A flow switch according to any one of the preceding claims, characterized in that the inner pipe (36) has a plurality of second outflow openings (50, 51), which are arranged at the same level in an axial direction.
EP12702812.4A 2012-02-01 2012-02-01 Flow switch Active EP2810292B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/051706 WO2013113385A1 (en) 2012-02-01 2012-02-01 Flow switch

Publications (2)

Publication Number Publication Date
EP2810292A1 EP2810292A1 (en) 2014-12-10
EP2810292B1 true EP2810292B1 (en) 2015-11-25

Family

ID=45567004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12702812.4A Active EP2810292B1 (en) 2012-02-01 2012-02-01 Flow switch

Country Status (4)

Country Link
EP (1) EP2810292B1 (en)
CN (1) CN104040667B (en)
DK (1) DK2810292T3 (en)
WO (1) WO2013113385A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405628A (en) * 2014-12-09 2015-03-11 合肥新沪屏蔽泵有限公司 Buoyancy sensing type flow switch
DE102018117140A1 (en) * 2018-07-16 2020-01-16 Schaeffler Technologies AG & Co. KG Tire valve and method for filling and emptying a motor vehicle tire

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1088427A (en) * 1964-12-23 1967-10-25 Allen West Automation Ltd Fluid flow switch
DE7424102U (en) * 1974-07-16 1974-10-10 Vdo Schindling A Ag Pressure medium-operated electrical switching device
US4763114A (en) * 1987-07-09 1988-08-09 Eidsmore Paul G Fluid flow indicator
DE3941981A1 (en) * 1989-12-20 1991-06-27 Kuebler Heinrich Flowmeter for vertical measurement flows - has float permanently magnetic coaxial to cylindrical symmetry axis and magnetic field sensitive elements along tube exterior
JPH08235983A (en) * 1995-03-01 1996-09-13 Nobuyuki Chigira Flow switch and water container with flow switch
CN2791850Y (en) * 2005-04-18 2006-06-28 谭文胜 Water-controlled switch
CN2833859Y (en) * 2005-05-26 2006-11-01 湖南五江轻化集团有限公司 Magnetic controlled water flow switch with hollow magnetic float

Also Published As

Publication number Publication date
WO2013113385A1 (en) 2013-08-08
DK2810292T3 (en) 2016-02-29
CN104040667B (en) 2016-09-21
EP2810292A1 (en) 2014-12-10
CN104040667A (en) 2014-09-10

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