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DE2523869A1 - Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium - Google Patents

Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium

Info

Publication number
DE2523869A1
DE2523869A1 DE19752523869 DE2523869A DE2523869A1 DE 2523869 A1 DE2523869 A1 DE 2523869A1 DE 19752523869 DE19752523869 DE 19752523869 DE 2523869 A DE2523869 A DE 2523869A DE 2523869 A1 DE2523869 A1 DE 2523869A1
Authority
DE
Germany
Prior art keywords
pressure
pressure transducer
press
pressure sensor
transducer 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.)
Withdrawn
Application number
DE19752523869
Other languages
German (de)
Inventor
Erich Brosa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19752523869 priority Critical patent/DE2523869A1/en
Publication of DE2523869A1 publication Critical patent/DE2523869A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0007—Fluidic connecting means
    • G01L19/0046—Fluidic connecting means using isolation membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0681—Protection against excessive heat

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The press. sensor acts as a pressure transfer line from a hot surface where a pressure is to be measured to the electronic part of the transducer, having a shaft (1) terminated by a measuring membrane (3) above which is a small volume (5) and capillaries (6, 6') filled with a transfer fluid such as mercury, and leading to a compensation space (7) and chamber (8) to an output membrane (9'). The compensation space (7) consists of a plug of low temp. expansion coefficient, such as quartz glass, with a screw plug (20) for exact adjustment of its volume content, and it has an annular gap (23) between its outer surface and the surrounding case (17).

Description

DruckauInehmer für heiße Massen Es sind Druckaufnehmer bekannt, die als Druckübertragungsmedium von der heißen Meßstelle zum elektronischen Wandlerteil eine Flüssigkeit, insbesondere Quecksilber, besitzen.Pressure transducers for hot masses Pressure transducers are known which as a pressure transmission medium from the hot measuring point to the electronic converter part have a liquid, especially mercury.

Diese Flüssigkeit wird meist in Kapillaren und kleinsten Druckräumen gehalten. Ihr Ausdehnungskoeffizient ist jedoch sehr groß, so daß eine Volumenkompensation erforderlich ist, um größere Meßfehler zu vermeiden.This liquid is mostly found in capillaries and the smallest pressure spaces held. However, their expansion coefficient is very large, so that a volume compensation is necessary to avoid major measurement errors.

In Abb. 1 ist 1 der Schaft des Druckaufnehmers mit dem Einschraubgewinde 2 und der Meßmembrane 3, die mit dem festen Einsatz 4 einen flachen Hohlraum 5 bildet, der mit der Druckübertragungsflüssigkeit ausgefüllt ist, die über die Kapillaren 6 und 6' mit dem Kompensationsraum 7 und der Kammer 8 verbunden ist, welche durch die Membrane 9' eines kompletten, austauschbaren Druckfühlers 9 gebildet wird.In Fig. 1, 1 is the shaft of the pressure transducer with the screw-in thread 2 and the measuring membrane 3, which forms a flat cavity 5 with the fixed insert 4, which is filled with the pressure transmission fluid that flows through the capillaries 6 and 6 'is connected to the compensation space 7 and the chamber 8, which through the membrane 9 'of a complete, replaceable pressure sensor 9 is formed.

Bei der 1. Montage des Druckaufnehmers preßt der Druckfühler 9 das Zwischenstück io über den Konus 11, womit das Kapillarrohr 6 abgedichtet ist. Der Stift 12 ist eine Drehsicherung. 13 ist eine Füll-und Dichtschraube. Der 0-Ring 14 ermöglicht, vor dem eigentlichen Festsitz des Druckfühlers 9, einen geringen Vordruck in diesem hydraulischen System zu erzeugen (Abb. 3).During the 1st assembly of the pressure transducer, the pressure sensor 9 presses it Intermediate piece io over the cone 11, with which the capillary tube 6 is sealed. Of the Pin 12 is a rotation lock. 13 is a filling and sealing screw. The 0-ring 14 allows, before the actual tight fit of the pressure sensor 9, a slight Generate pre-pressure in this hydraulic system (Fig. 3).

15 ist ein Steckanschluß für die elektrischen Zuleitungen.15 is a plug connection for the electrical leads.

Der Kompensationsraum 7 ist durch ein loses Füllstück 16 mit geringerem Temperatur-Koeffizienten, z.B. Quarzglas, als die es umgebende Hülse 17, fast ausgefüllt. Das Füllstück 16 kann eine Bohrung 18 oder einen seitlichen Anschliff 19 besitzen.The compensation space 7 is by a loose filler piece 16 with less Temperature coefficients, e.g. quartz glass, as the sleeve 17 surrounding it, almost filled. The filler piece 16 can have a bore 18 or a bevel 19 on the side.

(Abb. 2, vergrößert dargestellt) Das Schraubteil 20 dient zur Feinjustierung des Inhaltes des Kompensationsraumes 7.(Fig. 2, shown enlarged) The screw part 20 is used for fine adjustment the content of the compensation space 7.

Der Einsatz 4 dient zur Versteifung des konischen Teiles 22, damit es sich beim Festziehen des Schaftes 1 nicht nach innen verformt, sowie zur Bildung des Hohlraumes 5 und als Uberlastanschlag für die Meßmembrane 3. Der Konus 21 dient zur Verkürzung der Einspannlänge von Teil 22.The insert 4 is used to stiffen the conical part 22, so it does not deform inward when tightening the shaft 1, as well as for formation of the cavity 5 and as an overload stop for the measuring membrane 3. The cone 21 is used to shorten the clamping length of part 22.

Dehnt sich bei Erwärmung des Druckaufnehmers die Druckübertragungsflüssigkeit aus, so dehnt sich auch gleichzeitig der Kompensationsraum 7. Durch seine Volumenvergrößerung gegenüber dem Füllstück 16 kann die durch Erwärmung vergrößerte Flüssigkeitsmenge, hauptsächlich in dem sich vergrößernden Ringspalt 23 und z.T. an den Stirnseiten 24 des Füllstückes 16, aufgenommen werden, Je kleiner der Durchmesser der Membran 9t des Druckfühlers 9 (Wandler) ist, desto geringer kann der Hub der Meßmembran S sein, womit die Sicherheit gegen Bruch derselben erheblich steigt.If the pressure transducer heats up, the pressure transmission fluid expands then the compensation space 7 also expands at the same time. Due to its volume increase compared to the filler piece 16, the increased amount of liquid due to heating, mainly in the enlarging annular gap 23 and partly on the front sides 24 of the filler piece 16, the smaller the diameter of the membrane 9t of the pressure sensor 9 (transducer), the lower the stroke of the measuring diaphragm can be S, which increases the security against breakage of the same considerably.

Der Druckfühler oder Wandler 9 im oberen Teil des Schaftes 1 ist leicht austauschbar, beispielsweise für die Anpassung an andere Meßbereiche.The pressure sensor or transducer 9 in the upper part of the shaft 1 is light exchangeable, for example for adaptation to other measuring ranges.

Claims (7)

PatentansprücheClaims W Druckaufnehmer, dadurch gekennzeichnet, daß im Hydrauliksystem eines Druckaufnehmers für heiße Massen, im Bereich der hohen Temperatur sich ein druckfester Ausgleichsraum mit einem Füllstück von geringerem Temperatur-Koeffizienten befindet, in dessen, mit steigender Temperatur sich bildenden Ringspalt, die Volumenvergrößerung der DruckübertragungsfltlssigkeitAufnahme findet.W pressure transducer, characterized in that one in the hydraulic system Pressure transducer for hot masses, a pressure-resistant one in the high temperature range Compensating space with a filler piece with a lower temperature coefficient is located, in its annular gap, which forms with increasing temperature, the increase in volume the pressure transfer fluid is absorbed. 2 Druckaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß das Füllsttlck eine Kapillarbohrung und/oder einen seitlichen Flächenanschliff bzw. einen Kanal besitzt. 2 pressure transducer according to claim 1, characterized in that the Filler a capillary bore and / or a side surface bevel or owns a channel. 3 Druckaufnehmer nach Anspruch 1-2, dadurch gekennzeichnet, daß das stirnseitige Spiel gegenüber dem Füllstück durch einen Gewindeeinsatz justierbar ist. 3 pressure transducer according to claim 1-2, characterized in that the Frontal play in relation to the filler piece can be adjusted by means of a threaded insert is. 4 Druckaufnehmer nach Anspruch 1-3, dadurch gekennzeichnet, daß der Nembranraum durch eine gegenüber dem äußeren Diehtkonus fest eingepresste Versteifungsbuchse gebildet wird, die auch als Uberlastanschlag dient. 4 pressure transducer according to claim 1-3, characterized in that the Membrane space through a stiffening bushing firmly pressed in opposite to the outer Dieht cone is formed, which also serves as an overload stop. 5 Druckaufnehmer nach Anspruch 1-4, dadurch gekennzeichnet, daß der komplette Druckfühler oder Wandler im oberen Teil des Schaftes als komplettes Einbauteil austauschbar ist. 5 pressure transducer according to claim 1-4, characterized in that the Complete pressure sensors or transducers in the upper part of the shaft as a complete built-in part is interchangeable. 6 Druckaufnehmer nach Anspruch 1-5, dadurch gekennzeichnet, daß das Kapillarrohr durch Konus und Hülse dicht eingeklemmt ist. 6 pressure transducer according to claims 1-5, characterized in that the The capillary tube is tightly clamped by the cone and sleeve. 7 Druckaufnehmer nach Anspruch 1-6, dadurch gekennzeichnet, daß zwischen Druckfühler und Zwischenstück ein 0-Ring sowie im Hydrauliksystem eine Ventilschraube vorhanden sind, mit denen sich ein bestimmter Grunddruck einstellen läßt. 7 pressure transducer according to claim 1-6, characterized in that between Pressure sensor and intermediate piece an O-ring as well as a valve screw in the hydraulic system are available, with which a certain basic pressure can be set. Druckaufnehmer nach Anspruch 1-7, dadurch gekennzeichnet, daß die wirksame Fläche der oberen Druckwandlermembran praktisch gleich, kleiner oder höchstens 2 x größer als die der unteren Meßmembrane ist.Pressure sensor according to claims 1-7, characterized in that the effective area of the upper pressure transducer membrane practically the same, smaller or at most 2 times larger than that of the lower measuring membrane. Druckaufnehmer nach Anspruch 1-8, dadurch gekennzeichnet, daß die Berührungsfläche zwischen Teil 2 und Teil 22 konisch ausgebildet ist.Pressure sensor according to Claims 1-8, characterized in that the Contact surface between part 2 and part 22 is conical. Druckaufnehmer nach Anspruch 1-9, dadurch gekennzeichnet, daß das Zwischenstück 1o durch eine Drehsicherung gehalten ist.Pressure sensor according to claims 1-9, characterized in that the Intermediate piece 1o is held by a rotation lock. Druckaufnehmer nach Anspruch 1-1o, dadurch gekennzeichnet, daß die Kapillare 6 in gewundener Form eingebaut ist.Pressure sensor according to claims 1-1o, characterized in that the Capillary 6 is installed in a spiral form.
DE19752523869 1975-05-30 1975-05-30 Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium Withdrawn DE2523869A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752523869 DE2523869A1 (en) 1975-05-30 1975-05-30 Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752523869 DE2523869A1 (en) 1975-05-30 1975-05-30 Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium

Publications (1)

Publication Number Publication Date
DE2523869A1 true DE2523869A1 (en) 1976-12-16

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DE19752523869 Withdrawn DE2523869A1 (en) 1975-05-30 1975-05-30 Press transducer for hot surfaces - provides compensation by annular expansion chamber for press transfer medium

Country Status (1)

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DE (1) DE2523869A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004053672A1 (en) * 2004-11-03 2006-05-04 Endress + Hauser Gmbh + Co. Kg Pressure transfer device for e.g. differential pressure sensor, has fluid buffers with filling material chambers that communicate with hydraulic path, where materials have negative volume expansion coefficients
DE102004052950A1 (en) * 2004-10-29 2006-05-04 Endress + Hauser Gmbh + Co. Kg Pressure transducer with hydraulic pressure transmission
US7377174B2 (en) 2004-03-18 2008-05-27 Rosemount Inc. Capillary weld extension with thermal isolation
US20160223420A1 (en) * 2015-01-30 2016-08-04 Omega Engineering, Inc. Differential Pressure Sensing Device with Overload Protection
US9752946B2 (en) 2014-09-23 2017-09-05 Rosemount Inc. Cooling for industrial process variable transmitters
US9752947B2 (en) 2014-09-23 2017-09-05 P I Components Corp. Thermoelectric heating, cooling and power generation for direct mount and dual compartment fill remote seal systems
US9772246B2 (en) 2014-09-30 2017-09-26 Rosemount Inc. Fill fluid thermal management

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7377174B2 (en) 2004-03-18 2008-05-27 Rosemount Inc. Capillary weld extension with thermal isolation
DE102005012437B4 (en) * 2004-03-18 2011-06-01 Rosemount Inc., Eden Prairie Diaphragm seal unit with an extension piece and method for producing the same
DE102004052950A1 (en) * 2004-10-29 2006-05-04 Endress + Hauser Gmbh + Co. Kg Pressure transducer with hydraulic pressure transmission
US7866214B2 (en) 2004-10-29 2011-01-11 Endress + Hauser Gmbh + Co. Kg Pressure gauge with hydraulic pressure transmission
DE102004053672A1 (en) * 2004-11-03 2006-05-04 Endress + Hauser Gmbh + Co. Kg Pressure transfer device for e.g. differential pressure sensor, has fluid buffers with filling material chambers that communicate with hydraulic path, where materials have negative volume expansion coefficients
US9752946B2 (en) 2014-09-23 2017-09-05 Rosemount Inc. Cooling for industrial process variable transmitters
US9752947B2 (en) 2014-09-23 2017-09-05 P I Components Corp. Thermoelectric heating, cooling and power generation for direct mount and dual compartment fill remote seal systems
US9772246B2 (en) 2014-09-30 2017-09-26 Rosemount Inc. Fill fluid thermal management
US11313747B2 (en) 2014-09-30 2022-04-26 Rosemount Inc. Fill fluid thermal management
US20160223420A1 (en) * 2015-01-30 2016-08-04 Omega Engineering, Inc. Differential Pressure Sensing Device with Overload Protection
US9816889B2 (en) * 2015-01-30 2017-11-14 Omega Engineering, Inc. Differential pressure sensing device with overload protection

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