EP2810292A1 - Strömungsschalter - Google Patents
StrömungsschalterInfo
- Publication number
- EP2810292A1 EP2810292A1 EP12702812.4A EP12702812A EP2810292A1 EP 2810292 A1 EP2810292 A1 EP 2810292A1 EP 12702812 A EP12702812 A EP 12702812A EP 2810292 A1 EP2810292 A1 EP 2810292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- inner tube
- liquid
- flow switch
- switch according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- H01H35/40—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 known from DE 90 11 336 Ul. 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.
- 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.
- a flow switch of the generic type according to the invention that in the flow channel an inner tube surrounded by an annular tube is arranged, which accommodates the displaceable switch body and having a liquid inlet in flow connecting inlet port and at least a first and at least a second outlet opening wherein the at least one second outflow opening is arranged offset axially relative to the at least one first outflow opening and the outflow openings open into the annular space, and wherein the annular space is in flow connection with the liquid outlet.
- an inner tube is arranged, which fluidly depending on the liquid slidable 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 pipe, the liquid can flow out of the inner pipe 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.
- 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.
- a second, the liquid inlet facing away from the inner tube side is closed and the at least one second drain opening is axially offset from the second réellerohr- front page.
- 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 towards 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.
- There- by the flow resistance, which opposes the flow switch of 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 on 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.
- Figure 1 is 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
- Figure 2 a schematic sectional view of the flow switch of FIG.
- 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.
- the outer 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.
- Outer tube 14 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 shell 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 is displaced vertically against its weight from its rest position shown in FIG. 1 into its switching position shown in FIG. 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 is reliably held by the fluid flowing through the flow switch 10 in its switching position shown in Figure 2 by occupying a position between the first outlet opening 48 and the two second outflow 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 with relatively large annular gaps and annular spaces and is characterized by a reproducible switching point of the reed contact 58 at a temperature which is tion 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.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2012/051706 WO2013113385A1 (de) | 2012-02-01 | 2012-02-01 | Strömungsschalter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2810292A1 true EP2810292A1 (de) | 2014-12-10 |
| EP2810292B1 EP2810292B1 (de) | 2015-11-25 |
Family
ID=45567004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12702812.4A Active EP2810292B1 (de) | 2012-02-01 | 2012-02-01 | Strömungsschalter |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2810292B1 (de) |
| CN (1) | CN104040667B (de) |
| DK (1) | DK2810292T3 (de) |
| WO (1) | WO2013113385A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405628A (zh) * | 2014-12-09 | 2015-03-11 | 合肥新沪屏蔽泵有限公司 | 浮力感应式流量开关 |
| DE102018117140A1 (de) * | 2018-07-16 | 2020-01-16 | Schaeffler Technologies AG & Co. KG | Reifenventil und Verfahren zum Befüllen und Entleeren eines Kraftfahrzeugreifens |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1088427A (en) * | 1964-12-23 | 1967-10-25 | Allen West Automation Ltd | Fluid flow switch |
| DE7424102U (de) * | 1974-07-16 | 1974-10-10 | Vdo Schindling A Ag | Druckmittelbetätigte elektrische Schalteinrichtung |
| US4763114A (en) * | 1987-07-09 | 1988-08-09 | Eidsmore Paul G | Fluid flow indicator |
| DE3941981A1 (de) * | 1989-12-20 | 1991-06-27 | Kuebler Heinrich | Durchflussmesser fuer vertikale messstroemungen |
| JPH08235983A (ja) * | 1995-03-01 | 1996-09-13 | Nobuyuki Chigira | フロースイッチ及びフロースイッチ付整水器 |
| CN2791850Y (zh) * | 2005-04-18 | 2006-06-28 | 谭文胜 | 水控开关 |
| CN2833859Y (zh) * | 2005-05-26 | 2006-11-01 | 湖南五江轻化集团有限公司 | 具有空心磁浮子的磁控水流开关 |
-
2012
- 2012-02-01 CN CN201280067141.4A patent/CN104040667B/zh active Active
- 2012-02-01 DK DK12702812.4T patent/DK2810292T3/da active
- 2012-02-01 WO PCT/EP2012/051706 patent/WO2013113385A1/de not_active Ceased
- 2012-02-01 EP EP12702812.4A patent/EP2810292B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013113385A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104040667A (zh) | 2014-09-10 |
| DK2810292T3 (da) | 2016-02-29 |
| CN104040667B (zh) | 2016-09-21 |
| WO2013113385A1 (de) | 2013-08-08 |
| EP2810292B1 (de) | 2015-11-25 |
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