EP0994250A2 - High-pressure sensor - Google Patents
High-pressure sensor Download PDFInfo
- Publication number
- EP0994250A2 EP0994250A2 EP99810565A EP99810565A EP0994250A2 EP 0994250 A2 EP0994250 A2 EP 0994250A2 EP 99810565 A EP99810565 A EP 99810565A EP 99810565 A EP99810565 A EP 99810565A EP 0994250 A2 EP0994250 A2 EP 0994250A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- welding
- threaded body
- pressure sensor
- sensor according
- measuring head
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
Definitions
- the invention relates to high pressure sensors, e.g. in Injection systems for internal combustion engines or liquid jet cutting machines etc., especially where pulsating hydraulic Pressures to measure or peak at thousands of bar are control.
- the invention relates to surveillance systems of diesel engines, where peak values from 2000 to 3000 bar are to be measured.
- Fig. 1 represents a commercially available piezoresistive high pressure sensor consists of the four main parts: threaded body 1, Measuring head 2, membrane part 3, on which the measuring bridge 4 is applied is.
- Fig. 2 is the threaded body 5, the sealing section 6 and the membrane part 7, on which the capacitive measuring part 8 is mounted, in one piece executed.
- the membrane part 11 with the sealing section 10 is in one piece executed and welded to the sealing body 10 with the threaded body 9.
- the measuring bridge 12 consists of a silicone element that is blown onto the membrane part 11.
- the Prior Art pressure sensors are currently for max. Designed for pressures of 1500 bar and in use.
- the main idea of the invention relates to the overall view of the hydraulic and mechanical part to make it permanently reliable Find a solution suitable for monitoring purposes.
- the pressure sensor consists of the 6 main parts: Threaded body 16 Measuring head 14 Membrane section 21 Measuring bridge 22 Sealing section 20th Welding section 15 all of which are coordinated with one another with regard to mechanically permissible material tensions.
- the membrane section 21 is determined by the parameters ⁇ D 1 , ⁇ D 3 and thickness t.
- Minimum diameters d of the feed line are also of great importance 19 and the sealing section 20 in order to minimize material stresses to reach.
- the further part of the invention is directed to the design of the Welding section 15, the execution of which is decisive for safe Continuous operation of the pressure sensor. Long series of tests have shown that welding gaps from the inside, i.e. from the pressure side, below must be prevented in all circumstances.
- Fig. 5 shows the welding process by means of internal welding in Sweat start moment.
- the dimensions are according to known regulations of electrical butt welding technology, where the measuring head 14 held by the electrode 32 and electrically connected is.
- the fusion begins along the Welding cone surface 30, with pressure neck part 24 and welding cone 30 flow into one another, the welding path S being used up.
- Fig. 6 shows the state after the internal welding, the Welding path S through the pressure welding to the external welding gap 36 was reduced.
- the welding zone 34 has a transition radius 35, which is free of internal gaps. So that the pressure impulses find no attack surfaces from the inside due to the notch effect can lead to tears.
- the remaining outer welding gap 36 is in another Operation with laser, gas or electron beam welding closed.
- the design of the balloon-like pressure measuring space according to the invention with print head part 23 and print neck part 24, with the combined Internal welding to prevent tearing from the inside, and the external welding, to ensure the mechanical strength the connection of the measuring head 14 with the threaded body 16 and the smallest possible diameter d of the feed line 19 is Basis for a high pressure sensor for continuous operation with peak pressures created up to 2500 bar.
- the design of the membrane section 21 applied measuring bridge 22 can be based on various known technologies.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
- Glass Compositions (AREA)
Abstract
Description
Die Erfindung bezieht sich auf Hochdruck-Sensoren, wie sie z.B. in Einspritzsystemen von Verbrennungsmotoren oder Flüssigkeitsstrahl-Schneidemaschinen usw., insbesondere wo pulsierende hydraulische Drücke mit Spitzenwerten von tausenden von bar zu messen oder zu kontrollieren sind.The invention relates to high pressure sensors, e.g. in Injection systems for internal combustion engines or liquid jet cutting machines etc., especially where pulsating hydraulic Pressures to measure or peak at thousands of bar are control.
Im besonderen bezieht sich die Erfindung auf Überwachungssysteme von Dieselmotoren, wo im Dauerbetrieb Spitzenwerte von 2000 bis 3000 bar zu messen sind.In particular, the invention relates to surveillance systems of diesel engines, where peak values from 2000 to 3000 bar are to be measured.
Durch die Leistungssteigerung, die fast ausnahmslos mit Turboaufladung gekoppelt ist, sind immer grössere Brennstoffmengen in immer kürzerer Zeit zu verbrennen, wodurch in den letzten Jahren die Einspritzdrücke kontinuierlich gesteigert werden mussten. So sind heute Hochleistungsmotoren mit 3000 bar Einspritzdruck bekannt.Through the increase in performance, almost without exception with turbocharging coupled, there are always larger amounts of fuel in ever burn less time, causing the in recent years Injection pressures had to be increased continuously. So are known today as high-performance engines with 3000 bar injection pressure.
In den sogenannten Common Rail Systemen von Personenwagen Dieselmotoren, werden z.Z. Spitzendrücke von max. 1500 bar verwendet. Für die Überwachung solcher Anlagen sind eine Reihe von Hochdruck-Sensoren bekannt geworden, die in Fig. 1 bis 3 als Prior Art dargestellt sind.In the so-called common rail systems of passenger car diesel engines, are currently Peak pressures of max. 1500 bar used. A number of high-pressure sensors are used to monitor such systems become known, which is shown in Fig. 1 to 3 as Prior Art are.
In den folgenden Fig. 4 bis 7 ist der Gedanke der Erfindung dargestellt.The concept of the invention is shown in the following FIGS. 4 to 7.
Fig. 1 stellt einen handelsüblichen piezoresistiven-Hochdruck-Sensor
dar, bestehend aus den vier Hauptteilen: Gewindekörper 1,
Messkopf 2, Membranteil 3, auf dem die Messbrücke 4 aufgebracht
ist.Fig. 1 represents a commercially available piezoresistive high pressure sensor
consists of the four main parts: threaded body 1,
Measuring
In Fig. 2 ist der Gewindekörper 5, die Dichtpartie 6 und der Membranteil
7, auf dem das kapazitive Messteil 8 gelagert ist, einstückig
ausgeführt.In Fig. 2 is the threaded
In Fig. 3 ist das Membranteil 11 mit der Dichtpartie 10 einstückig
ausgeführt und an der Dichtpartie 10 mit dem Gewindekörper 9 verschweisst.
Die Messbrücke 12 besteht aus einem Silikonelement, das
auf dem Membranteil 11 aufgeglast ist. Die Prior Art Drucksensoren
sind z.Z. für max. Drücke von 1500 bar ausgelegt und im Einsatz.In Fig. 3, the
Die Erfindung befasst sich jedoch mit Hochdruck-Sensoren für Dauerbetrieb mit Spitzenwerten über 2000 bar, wo wesentliche härtere Anforderungen an Dichtpartie-Zuleitung und Membranteil gestellt werden. Alle drei Konstruktionen der Prior Art konnten solchen Anforderungen nicht genügen. Die Erfindungsgedanken sind in den Fig. 4 bis 7 als Beispiel dargestellt.
- Fig. 4
- zeigt schematisch den erfindungsgemässen Druckgeber im Schnitt,
- Fig. 5
- zeigt den Messkopf vor dem Innenschweissvorgang,
- Fig. 6
- zeigt denselben Messkopf nach dem Innenschweissvorgang und vor dem Aussenschweissvorgang,
- Fig. 7
- zeigt die fertige Verbindung zwischen Messkopf und Gewindeteil.
- Fig. 4
- schematically shows the pressure transmitter according to the invention in section,
- Fig. 5
- shows the measuring head before the internal welding process,
- Fig. 6
- shows the same measuring head after the internal welding process and before the external welding process,
- Fig. 7
- shows the finished connection between the measuring head and the threaded part.
Der Hauptgedanke der Erfindung bezieht sich auf die Gesamtbetrachtung des hydraulischen und mechanischen Teils, um eine dauerbetriebssichere Lösung, geeignet für Überwachungszwecke, zu finden.The main idea of the invention relates to the overall view of the hydraulic and mechanical part to make it permanently reliable Find a solution suitable for monitoring purposes.
Druckspitzen in der Grössenordnung von 3500 bar müssen als Prüfwerte
bei der Abnahmeprüfung der Sensoren vorgesehen werden, um
Dauerbetriebswerte von 2500 bar für zwei Service-Jahre zu garantieren.
Solche Prüfwerte liegen jedoch an der Elastizitätsgrenze
von rostfreien Hochleistungsstählen, die noch schweissbar sind.
Die Gesamtheit der Probleme:
In Fig. 4 sind die Ziele der Erfindung schematisch dargestellt.
Der Drucksensor besteht aus den 6 Hauptteilen:
Von überragender Bedeutung im Gesamtsystem ist die Gestaltung des
Messkopfes 14. Um befriedigende Signale der Messbrücke 22 zu gewährleisten,
ist die Membranpartie 21 durch die Parameter ⊘ D1, ⊘
D3 und Dicke t bestimmt.The design of the
Um die hochgefährdete Schweisspartie 15 im zulässigen Materialfestigkeitsbereich zu halten, ist der Druckkopf 23 mit dem Ø D1 grösser als der Druckhals 24 mit Ø D2. Damit wird erreicht, dass für
- das optimale Messsignal ⊘ D1 wirkt
- die minimale Materialspannung Ø D2 wirkt
- the optimal measurement signal ⊘ D 1 is effective
- the minimum material tension Ø D 2 is effective
Von grosser Bedeutung sind auch minimale Durchmesser d der Zuleitung
19 und der Dichtpartie 20, um minimale Materialspannungen zu
erreichen.Minimum diameters d of the feed line are also of
Von Bedeutung ist auch die Herstellungsmöglichkeit eines ballonartigen
Druckraumes, bestehend aus dem Druckkopfteil 23 und dem
Druckhalsteil 24. Die Durchmesser derselben, deren Tiefe T und der
Öffnungswinkel α sind wiederum so aufeinander abgestimmt, dass
sie mit modernen Bearbeitungsmethoden wirtschaftlich herstellbar
sind. Dazu kommen Zerspanungs- oder Elektroerosionsmethoden oder
beide kombiniert in Frage.Also important is the possibility of manufacturing a balloon-like one
Print room, consisting of the
Der weitere Teil der Erfindung richtet sich auf die Gestaltung der
Schweisspartie 15, deren Ausführung massgebend ist für sicheren
Dauerbetrieb des Drucksensors. Lange Versuchsreihen haben gezeigt,
dass Schweissspalte von innen, also von der Druckseite her, unter
allen Umständen verhindert werden müssen.The further part of the invention is directed to the design of the
Fig. 5 zeigt den Aufschweissvorgang mittels Innenschweissung im
Moment des Schweissbeginns. Dazu ist der Gewindekörper 16 mit einem
Schweisskonus 30 versehen, auf dem der Messkopf 14 mit der
Halskante 31 aufsitzt. Die Dimensionen sind nach bekannten Vorschriften
der elektrischen Stumpfschweisstechnik ausgebildet, wobei
der Messkopf 14 von der Elektrode 32 gehaltert und elektrisch
verbunden ist.Fig. 5 shows the welding process by means of internal welding in
Sweat start moment. For this purpose, the threaded
Während des Schweissvorgangs beginnt die Verschmelzung entlang der
Schweisskonusfläche 30, wobei Druckhalsteil 24 und Schweisskonus
30 ineinanderfliessen, wobei der Schweissweg S verbraucht wird.During the welding process, the fusion begins along the
Welding
Fig. 6 zeigt den Zustand nach der Innenschweissung, wobei der
Schweissweg S durch die Pressschweissung zum Aussen-Schweissspalt
36 reduziert wurde. Die Schweisszone 34 weist einen Übergangsradius
35 auf, der frei von Innenspalten ist. Damit finden die Druckimpulse
von Innen keine Angriffsflächen, die infolge Kerbwirkung
zu Wanderrissen führen können.Fig. 6 shows the state after the internal welding, the
Welding path S through the pressure welding to the
Der verbliebene Aussen-Schweissspalt 36 wird in einer weiteren
Operation mit einer Laser-, Gas- oder Elektronen-Strahlschweissung
geschlossen.The remaining
Dieser Endzustand ist in Fig. 7 dargestellt, nach Durchführung der
Aussenschweissung, welche die Aussen-Schweisszone 37 ausbildet,
die auf die Innen-Schweisszone 34 übergreifen kann.This final state is shown in FIG. 7 after the outer welding has been carried out, which forms the
Mit der erfindungsgemässen Innen- und Aussenschweissung wird von
innen die Wanderrissgefahr und von aussen die mechanische Festigkeit
der hochbelasteten Verbindung des Messkopfes 14 mit dem Gewindekörper
16 erreicht.With the internal and external welding according to the invention,
risk of tearing inside and mechanical strength from the outside
the highly loaded connection of the measuring
Die erfindungsgemässe Gestaltung des ballonartigen Druckmessraumes
mit Druckkopfteil 23 und Druckhalsteil 24, mit der kombinierten
Innenschweissung zur Verhinderung von Wanderrissen von innen, und
der Aussen-Schweissung, zur Gewährleistung der mechanischen Festigkeit
der Verbindung Messkopf 14 mit dem Gewindekörper 16 sowie
dem kleinstmöglichen Durchmesser d der Zuleitung 19, ist die
Grundlage für einen Hochdruck-Sensor für Dauerbetrieb mit Spitzendrücken
bis 2500 bar geschaffen. Die Gestaltung der auf der Membranpartie
21 aufgebrachten Messbrücke 22 kann auf der Basis verschiedener
bekannter Technologien ausgeführt werden. The design of the balloon-like pressure measuring space according to the invention
with
- 1
- Gewindekörper
- 2
- Messkopf
- 3
- Membranteil
- 4
- Messbrücke
- 1
- Threaded body
- 2nd
- Measuring head
- 3rd
- Membrane part
- 4th
- Measuring bridge
- 5
- Gewindekörper
- 6
- Dichtpartie
- 7
- Membranteil
- 8
- Messteil
- 5
- Threaded body
- 6
- Sealing section
- 7
- Membrane part
- 8th
- Measuring part
- 9
- Gewindekörper
- 10
- Dichtpartie
- 11
- Membranteil
- 12
- Messbrücke
- 9
- Threaded body
- 10th
- Sealing section
- 11
- Membrane part
- 12th
- Measuring bridge
- 14
- Messkopf
- 15
- Schweisspartie
- 16
- Gewindekörper
- 17
- Schlüsselfläche
- 18
- Gewinde
- 19
- Zuleitung
- 20
- Dichtpartie
- 21
- Membranpartie
- 22
- Messbrücke
- 23
- Druckkopfteil
- ⊘ D1, ⊘ D3, t
- Membranparameter
- 24
- Druckhalsteil
- ⊘d
- Zuleitungs-Durchmesser
- α
- Öffnungswinkel des Ballons
- 14
- Measuring head
- 15
- Welding section
- 16
- Threaded body
- 17th
- Key surface
- 18th
- thread
- 19th
- Supply
- 20th
- Sealing section
- 21
- Membrane section
- 22
- Measuring bridge
- 23
- Printhead part
- ⊘ D 1 , ⊘ D 3 , t
- Membrane parameters
- 24th
- Pressure neck part
- ⊘d
- Lead diameter
- α
- Opening angle of the balloon
- 30
- Schweisskonus
- 31
- Halskante
- 32
- Elektrode
- S
- Schweissweg
- 30th
- Welding cone
- 31
- Neck edge
- 32
- electrode
- S
- Welding path
- 34
- Innen-Schweisszone
- 35
- Übergangsradius
- 36
- Aussen-Schweissspalt
- 34
- Inside welding zone
- 35
- Transition radius
- 36
- Outside welding gap
- 37
- Aussen-Schweisszone
- 37
- Outside welding zone
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01500/98A CH693490A5 (en) | 1998-07-14 | 1998-07-14 | High pressure sensor. |
CH150098 | 1998-07-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0994250A2 true EP0994250A2 (en) | 2000-04-19 |
EP0994250A3 EP0994250A3 (en) | 2000-08-09 |
EP0994250B1 EP0994250B1 (en) | 2003-04-23 |
Family
ID=4211909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99810565A Expired - Lifetime EP0994250B1 (en) | 1998-07-14 | 1999-07-01 | High-pressure sensor |
Country Status (5)
Country | Link |
---|---|
US (1) | US6092426A (en) |
EP (1) | EP0994250B1 (en) |
AT (1) | ATE238536T1 (en) |
CH (1) | CH693490A5 (en) |
DE (1) | DE59905161D1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011072911A1 (en) * | 2009-12-15 | 2011-06-23 | Robert Bosch Gmbh | Method for producing a pressure sensor assembly and pressure sensor assembly |
ITBO20100309A1 (en) * | 2010-05-17 | 2011-11-18 | Magneti Marelli Spa | FUEL PUMP FOR A DIRECT INJECTION SYSTEM |
WO2013159962A1 (en) * | 2012-04-27 | 2013-10-31 | Robert Bosch Gmbh | Sensor arrangement for detecting at least one property of a fluid medium and method for producing such a sensor arrangement |
EP2918820A1 (en) * | 2014-03-14 | 2015-09-16 | Robert Bosch Gmbh | Fuel injector, in particular a common-rail injector |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10034460A1 (en) * | 2000-07-15 | 2002-01-31 | Bosch Gmbh Robert | High pressure sensor, method and tool for its manufacture |
US6923068B2 (en) * | 2003-06-19 | 2005-08-02 | Dynisco, Inc. | Pressure transducer |
JP2010249061A (en) * | 2009-04-17 | 2010-11-04 | Denso Corp | Fuel injection valve |
DE102011078048A1 (en) * | 2011-06-24 | 2012-12-27 | Robert Bosch Gmbh | Sensor for detecting at least one property of a fluid medium |
DE102016113209B4 (en) * | 2016-07-18 | 2024-07-18 | Sensata Germany GmbH | PRESSURE SENSOR |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5542300A (en) * | 1994-01-24 | 1996-08-06 | Setra Systems, Inc. | Low cost, center-mounted capacitive pressure sensor |
US5587601A (en) * | 1995-06-05 | 1996-12-24 | Kulite Semiconductor Products, Inc. | Support structure for a semiconductor pressure transducer |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4164938A (en) * | 1977-11-25 | 1979-08-21 | Patton William F | Medical pressure gauge and indicator device |
US5186055A (en) * | 1991-06-03 | 1993-02-16 | Eaton Corporation | Hermetic mounting system for a pressure transducer |
DE29501112U1 (en) * | 1995-01-25 | 1995-03-23 | Heinrich Baumgarten KG, Spezialfabrik für Beschlagteile, 57290 Neunkirchen | Pressure indicator |
-
1998
- 1998-07-14 CH CH01500/98A patent/CH693490A5/en not_active IP Right Cessation
-
1999
- 1999-06-28 US US09/340,202 patent/US6092426A/en not_active Expired - Lifetime
- 1999-07-01 EP EP99810565A patent/EP0994250B1/en not_active Expired - Lifetime
- 1999-07-01 AT AT99810565T patent/ATE238536T1/en active
- 1999-07-01 DE DE59905161T patent/DE59905161D1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5542300A (en) * | 1994-01-24 | 1996-08-06 | Setra Systems, Inc. | Low cost, center-mounted capacitive pressure sensor |
US5587601A (en) * | 1995-06-05 | 1996-12-24 | Kulite Semiconductor Products, Inc. | Support structure for a semiconductor pressure transducer |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011072911A1 (en) * | 2009-12-15 | 2011-06-23 | Robert Bosch Gmbh | Method for producing a pressure sensor assembly and pressure sensor assembly |
US8763465B2 (en) | 2009-12-15 | 2014-07-01 | Robert Bosch Gmbh | Method for producing a pressure sensor assembly and pressure sensor assembly |
ITBO20100309A1 (en) * | 2010-05-17 | 2011-11-18 | Magneti Marelli Spa | FUEL PUMP FOR A DIRECT INJECTION SYSTEM |
EP2388470A1 (en) * | 2010-05-17 | 2011-11-23 | Magneti Marelli S.p.A. | Fuel pump for a direct injection system |
US9127631B2 (en) | 2010-05-17 | 2015-09-08 | MAGNETI MARELLI S.p.A. | Fuel pump for a direct injection system |
WO2013159962A1 (en) * | 2012-04-27 | 2013-10-31 | Robert Bosch Gmbh | Sensor arrangement for detecting at least one property of a fluid medium and method for producing such a sensor arrangement |
EP2918820A1 (en) * | 2014-03-14 | 2015-09-16 | Robert Bosch Gmbh | Fuel injector, in particular a common-rail injector |
Also Published As
Publication number | Publication date |
---|---|
EP0994250A3 (en) | 2000-08-09 |
EP0994250B1 (en) | 2003-04-23 |
CH693490A5 (en) | 2003-08-29 |
US6092426A (en) | 2000-07-25 |
ATE238536T1 (en) | 2003-05-15 |
DE59905161D1 (en) | 2003-05-28 |
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