EP2493705A1 - Vorrichtung zur sensortechnischen ermittlung einer druckdifferenz in einer druckluftdurchströmten arbeitsleitung - Google Patents
Vorrichtung zur sensortechnischen ermittlung einer druckdifferenz in einer druckluftdurchströmten arbeitsleitungInfo
- Publication number
- EP2493705A1 EP2493705A1 EP10795920A EP10795920A EP2493705A1 EP 2493705 A1 EP2493705 A1 EP 2493705A1 EP 10795920 A EP10795920 A EP 10795920A EP 10795920 A EP10795920 A EP 10795920A EP 2493705 A1 EP2493705 A1 EP 2493705A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pressure difference
- throttle
- switch unit
- unit
- 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
- 238000001514 detection method Methods 0.000 title abstract 2
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 8
- 230000001939 inductive effect Effects 0.000 claims description 4
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 2
- 238000005273 aeration Methods 0.000 abstract 1
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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
- H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
-
- 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
- H01H35/247—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow the switch being of the reed switch type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
-
- 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
- H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
Definitions
- the present invention relates to a device for sensor-related determination of a pressure difference occurring between a first point and a second point arranged spaced therefrom in the flow direction in the region of a throttle inserted in a compressed-air-flowed working line.
- the field of application of the present invention extends to fluid-technical applications in which the presence of a flow of pressure medium in a line and the direction thereof are to be detected in order to signal-process this information in a superordinate control unit.
- Possible applications are, for example, tire pressure monitoring devices in which the pressurization of at least one air-sprung tire of a motor vehicle is controlled. In this case, the higher-level control needs information about the current pressure of the connected air-sprung tires to be determined by sensor technology.
- other applications are conceivable, for example in pneumatic door actuation systems or in the field of internal combustion engine technology.
- EP 0 003 188 A1 discloses a technical solution for determining a pressure difference in the region of a throttle inserted in a working fluid line leading to a pressure medium.
- the working line leads here combustion air whose supply is to be controlled.
- the presence of an air flow through the working line is by their tapping at two - -
- DE 2 318 973 AI discloses another device for sensor-related determination of a pressure difference, in which this pressure difference is used on both sides of a piston in size and sign to obtain switching signals for a higher-level control.
- the piston is arranged to be axially displaceable in a housing which forms a pressure chamber provided with a pressure medium connection on both sides of the piston displaceably mounted longitudinally against spring forces.
- the piston is assigned for its two Verschiebraumen two spring arrangements, which are supported with their abutting first ends permanently on stops on the housing and with their second ends on the component mounted stop discs.
- the end faces facing away from the abutment discs of the respective spring are associated, depending on the abutment on the piston and on the housing, in such a way that, in a neutral position of the piston deviating from the end positions, both abutment discs rest on the associated abutments on the piston and housing, while in the case of displacements the piston in the direction of the respective displacement existing stop plate only on the associated system on the piston, on the other hand, in the direction of the respective displacement rear stop disc rests only on the associated system on the housing.
- the piston is provided with means for the position-dependent actuation of electrical switching means. As electrical switching means two oppositely arranged tip switch are provided, the mutual actuation takes place via a driver arm, which is mechanically connected to the piston of the differential pressure sensor.
- a disadvantage of this prior art is the rather high number of components caused by the stop discs, compression springs, seals and the like. - -
- the invention includes the technical teaching that the pressure at the first point in the flow direction before and at the second point in the flow direction - not at-but-branched off after the throttle to the pressure difference across the integrated throttle in the working line on both sides of a parallel thereto fed switched pressure balance unit.
- the pressure compensator unit reports in cooperation with an electrical switch unit , ,
- a binary ventilation signal if the pressure compensator unit detects a significant positive or negative pressure difference across the throttle, which serves within the scope of the device according to the invention in this respect as a kind of measuring throttle.
- the advantage of the solution according to the invention is, in particular, that the special juxtaposition of measuring throttle to pressure compensator unit to electrical switch unit with few components can be easily implemented.
- the existing pressure difference is converted into a position with the first pairing of metering restrictor to pressure compensating unit. With the pairing pressure compensator unit to electrical switch unit of the position thus generated is used as an actuating force for the electrical switch unit.
- the electrical signal generated in this way on the basis of a pressure difference can be used to initiate and terminate applications based on compressed air flows in working lines.
- the pressure compensator which is used to implement the measured pressure difference in a travel, preferably consists of a cylindrical housing with end pressure connections for connection to the first and second position before / after the throttle and contains a by the pressure difference axially and bidirectionally adjustable balance piston, which is dynamically sealed against the wall of the housing.
- the balance piston For positioning the balance piston in a center differential position defined as differential pressure-free starting position, the balance piston is arranged on both sides of two spring elements, which come into abutment with the end respectively applied to the balance piston on the front sides of the housing.
- two opposite the balance piston and acted upon by spring forces pressure chambers are created.
- Such a pressure balance unit is simple and robust and consists of the above-mentioned few individual components.
- magnetic coupling means are used.
- a magnetic coupling agent preferably acts in the Waa- - -
- the balance piston can also consist entirely of permanent magnet material.
- the Druckwaa- ge unit interacts via mechanical coupling means with the electrical switch unit.
- the balance piston connecting to the switch unit actuating tappet can be provided, which extends transversely to the axis of movement of the balance piston in the direction of electrical switch unit.
- the actuating plunger can either be part of the balance piston or part of the switch unit.
- the electrical switch unit can be formed as a conventional multi-pole toggle switch, which is available as a standard component.
- the balance piston is disposed between two elastomeric membranes, each delimiting a pressure chamber, which is connected to the first and second position of the throttle.
- the distal end of the actuating plunger acts together with a radial recess on the balance piston for switch actuation. Thanks to the two elastomeric diaphragms enclosing the balance piston, the transition area cooperating with the actuating plunger and the electrical switch is not under pressure, so that no further sealing measures have to be taken.
- the elastomeric material of the elastomeric membranes is made so thick that, in the case of a pressure equilibrium, ie in the absence of pressure difference, the neutral center position is established without the need for additional spring elements.
- the electrical switch unit is preferably equipped with three switch positions and signals the superordinate-preferably electronic-control unit in the said center position of the balance piston no pressure requirement. - -
- the working line equipped with the device according to the invention for sensor-related determination of a differential pressure can be acted upon by an electropneumatic valve with compressed air on the input side in order to fill a preferably closed container at the end.
- the device according to the invention determines whether compressed air flows into the container and when a flow compensation occurs and reports a corresponding electrical signal to the higher-order control unit, which in turn controls the control valve.
- the electronic control unit can receive a desired pressure level manually or automatically. This example of application can be used when filling air-sprung tires of a motor vehicle, the filling of boiler-like compressed air storage tanks and the like.
- Figure 1 is a circuit-diagram-like representation of a device for determining a differential pressure in a first embodiment
- FIG. 2 shows a device for determining a differential pressure in a second embodiment.
- electro-pneumatic control valve 1 flows a compressed air flow through a working line 2 in a - also indicated only schematically - closed container 3, which is to be filled with compressed air.
- working line 2 is an effective flow cross-section narrowing - -
- Throttle 4 inserted. At a first point 5a in front of the throttle 4 and a second point 5b after the throttle 4 is at the flow through the working line 2 with compressed air to a different high pressure.
- a parallel to the throttle 4 connected pressure compensating unit 6 determines the pressure difference resulting from the different pressures at the first point 5a and the second point 5b, in which the said pressures are diverted from the working line 2.
- the pressure compensator 6 consists essentially of a cylindrical housing 7 with each end face side pressure connections for connection to the first and second points 5a and 5b of the working line 2.
- an axially bidirectionally adjustable balance piston 8 is integrated within the housing 7, an axially bidirectionally adjustable balance piston 8 is integrated.
- the balance piston 8 is by applying two oppositely acting thereon spring elements 9a and 9b in the differential pressure initial state in the middle position shown.
- the pressure compensator unit 6 cooperates via this embodiment via magnetic coupling means with an electrical switch unit 10 positioned close to it.
- a magnetic coupling means of the balance piston 8 here consists of a permanent magnet, whereas the hereby cooperating electrical switch unit 10 is formed as an inductive reed switch.
- the pressure compensating unit 6 detects a significant positive or negative pressure difference across the throttle 4, depending on the direction of flow of the working line 2, then this sensor-related detected event can be reported via the electrical switch unit 10 to a higher-level control unit 11, which operates as a function of predetermined control values and determined pressure difference value, the electro-pneumatic control valve 1 drives. If after opening the electro-pneumatic control valve 1 compressed air as long as flows into the connected container 3 until it is completely filled, finally no pressure difference can be determined via the throttle 4, so that the electronic control unit 11 then the electropneumatic valve 1 from the open in the can bring closed position.
- a balance piston 8 'between two elastomeric membranes 12a and 12b is arranged, each having a pressure chamber 13a and 13b - -
- actuating a balance piston 8 'associated electrical switch unit 10' is a mechanical coupling means which comes as an actuating plunger 14 with a corresponding radial recess 15 on the balance piston 8 'for engagement.
- the axial movement of the balance piston 8 'generated due to the pressure difference thus leads to a tilting switching of the actuating plunger 14 of the electrical switching unit 10' to the purpose already mentioned in connection with the above description of the first embodiment.
- the invention is not limited to the two preferred embodiments described above. On the contrary, modifications are conceivable which are included in the scope of protection of the following claims.
- the device according to the invention for sensor-related determination of a pressure difference for a purpose other than for pressurizing a closed container.
- Particularly advantageous is the use in connection with a tire pressure monitoring device for air-sprung tires of a motor vehicle.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009051406A DE102009051406A1 (de) | 2009-10-30 | 2009-10-30 | Vorrichtung zur sensortechnischen Ermittlung einer Druckdifferenz in einer druckluftdurchströmten Arbeitsleitung |
| PCT/EP2010/006629 WO2011050983A1 (de) | 2009-10-30 | 2010-10-29 | Vorrichtung zur sensortechnischen ermittlung einer druckdifferenz in einer druckluftdurchströmten arbeitsleitung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2493705A1 true EP2493705A1 (de) | 2012-09-05 |
| EP2493705B1 EP2493705B1 (de) | 2015-07-15 |
Family
ID=43734315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10795920.7A Not-in-force EP2493705B1 (de) | 2009-10-30 | 2010-10-29 | Vorrichtung zur sensortechnischen ermittlung einer druckdifferenz in einer druckluftdurchströmten arbeitsleitung |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2493705B1 (de) |
| CN (1) | CN102596598B (de) |
| DE (1) | DE102009051406A1 (de) |
| RU (1) | RU2545177C2 (de) |
| WO (1) | WO2011050983A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018208755A1 (de) * | 2018-06-04 | 2019-12-05 | Zf Friedrichshafen Ag | Druckregelventil |
| CN108730245A (zh) * | 2018-07-02 | 2018-11-02 | 尹财富 | 一种液压循环系统 |
| WO2020219344A1 (en) * | 2019-04-23 | 2020-10-29 | Hendrickson Usa, L.L.C. | Tire inflation system with parallel flow path |
| CN111504397B (zh) * | 2020-04-09 | 2025-05-02 | 华电电力科学研究院有限公司 | 一种褐煤掺烧磨煤机一次风量防堵测量装置及其控制方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2117149A5 (de) * | 1970-12-03 | 1972-07-21 | Facem Fabbrica Apparecch | |
| DE2318973A1 (de) | 1973-04-14 | 1974-10-24 | Volkswagenwerk Ag | Differenzdruckschalter |
| EP0003188A1 (de) | 1978-01-11 | 1979-07-25 | SAUNIER DUVAL - Société Anonyme | Einstellbarer luftdruckempfindlicher Schalter eines Sicherheitsverfahrens für die Überwachung der Luftabgabe benötigt für die Verbrennung eines Gasbrenners |
| DE2928802C2 (de) * | 1979-07-17 | 1985-05-30 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Druckmittelbetätigter Differenzdruckschalter |
| GB2239076A (en) * | 1989-12-14 | 1991-06-19 | Lawrence Patrick Lonergan | Building services water supply programmable isolation and malfunction indication system |
| SU1809661A1 (ru) * | 1991-01-03 | 1996-04-27 | Научно-исследовательский технологический институт | Дифманометр-расходомер жидкости |
| RU2052674C1 (ru) * | 1991-12-09 | 1996-01-20 | Евгений Алексеевич Шутков | Способ индикации отказа на контролируемом участке последовательной гидравлической цепи |
| DE4226941A1 (de) | 1992-08-14 | 1994-02-17 | Teves Gmbh Alfred | Differenzdruckschalter |
| JP2003510535A (ja) * | 1999-09-20 | 2003-03-18 | ウォン バー リー | ガス安全弁 |
| US6363963B1 (en) * | 2000-08-25 | 2002-04-02 | William C. White | Excess flow shutoff valve |
| JP2008189463A (ja) * | 2007-01-11 | 2008-08-21 | Mitsubishi Electric Corp | 油圧エレベータ装置 |
-
2009
- 2009-10-30 DE DE102009051406A patent/DE102009051406A1/de not_active Ceased
-
2010
- 2010-10-29 RU RU2012122165/06A patent/RU2545177C2/ru not_active IP Right Cessation
- 2010-10-29 CN CN201080048953.5A patent/CN102596598B/zh not_active Expired - Fee Related
- 2010-10-29 WO PCT/EP2010/006629 patent/WO2011050983A1/de not_active Ceased
- 2010-10-29 EP EP10795920.7A patent/EP2493705B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011050983A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2012122165A (ru) | 2013-12-10 |
| DE102009051406A1 (de) | 2011-05-05 |
| CN102596598B (zh) | 2015-04-29 |
| CN102596598A (zh) | 2012-07-18 |
| EP2493705B1 (de) | 2015-07-15 |
| RU2545177C2 (ru) | 2015-03-27 |
| WO2011050983A1 (de) | 2011-05-05 |
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