EP4204783A1 - Hydraulischer druckmittler und druckaufnehmer mit hydraulischem druckmittler - Google Patents
Hydraulischer druckmittler und druckaufnehmer mit hydraulischem druckmittlerInfo
- Publication number
- EP4204783A1 EP4204783A1 EP21748841.0A EP21748841A EP4204783A1 EP 4204783 A1 EP4204783 A1 EP 4204783A1 EP 21748841 A EP21748841 A EP 21748841A EP 4204783 A1 EP4204783 A1 EP 4204783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- holder
- separating membrane
- pressure transmitter
- temperature sensor
- 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- Withdrawn
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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0627—Protection against aggressive medium in general
- G01L19/0645—Protection against aggressive medium in general using isolation membranes, specially adapted for protection
-
- 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
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
-
- 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
- G01L19/0618—Overload protection
-
- 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
- G01L2019/0053—Pressure sensors associated with other sensors, e.g. for measuring acceleration, temperature
Definitions
- the present invention relates to a hydraulic pressure transmitter and a pressure sensor with a hydraulic pressure transmitter.
- Hydraulic diaphragm seals usually comprise a base body having a surface on which a separating membrane is fastened in a pressure-tight manner with at least two weld seams, so that a pressure chamber is formed between the separating membrane and the surface, which is connected to a hydraulic path via an opening in the surface of the base body communicates.
- the pressure chamber and the hydraulic path are filled with a transmission fluid.
- Knowing the process temperature is usually essential for controlling an industrial process.
- the process temperature is usually recorded in two different ways. In the first option, a change in resistance of a resistor in the pressure converter is used to determine the process temperature, whereas in the second option, a temperature converter designed separately from the pressure converter is used to determine the process temperature.
- a temperature sensor arranged next to the separating membrane which may come into contact with the media, requires either an additional opening in the media container or the media-carrying line through which the temperature sensor can be inserted, or with a given separating membrane surface, the radius of the base body must be increased by one be increased to such an extent that there is still space on the edge of the base body for installing a temperature sensor next to the separating membrane.
- the object is achieved according to the invention by the pressure transmitter according to independent claim 1 and the pressure converter according to independent claim 13.
- the pressure transmitter according to the invention for transmitting a pressure of a process medium comprises: a base body having a surface; and an isolating membrane attached to the surface, a pressure chamber being formed between the isolating membrane and the surface, which pressure chamber communicates with a hydraulic path via an opening in the surface, the isolating membrane can be acted upon by the process medium from a first isolating membrane side, the pressure chamber and the hydraulic path is filled with a transmission fluid to transmit the pressure of the process medium;
- the separating membrane is a plate-shaped membrane with a peripheral edge and the plate-shaped membrane is connected to the surface of the base body in a pressure-tight manner via a weld seam, preferably a single peripheral weld seam, and the separating membrane has a central middle area
- the pressure transmitter also having a temperature sensor for determining a measured temperature variable of the process medium and a holder for the temperature sensor for better heat transfer between the process medium and the temperature sensor, the temperature sensor being at least partially incorporated into or attached to the
- the introduction of a thermally conductive temperature sensor holder, for example made of copper or a similar material, into the base body behind the process diaphragm is proposed.
- the temperature sensor attaches to the bracket attached or at least partially introduced into it. This can also be done in support of a thermally conductive adhesive.
- the holder is designed in such a way that the process diaphragm also has a stop surface on the holder against which it can be supported or applied, so that an undesired embossing of the separating diaphragm, for example due to high pressure on the process side, is prevented.
- An advantageous embodiment of the pressure transmitter according to the invention provides that the central recess and the holder are matched to one another in such a way that a contact surface with which the holder is in direct contact with the base body is smaller than the surface of the holder that is in a plane to of the separating membrane is in the central area.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder is made of a material with a thermal conductivity of greater than 200 W/(m*K), preferably greater than 300 W/(m*K), very particularly preferably greater than 400 W/(m *K) is trained.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder is made of copper.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder is fixed with the surface facing towards the separating membrane on the separating membrane, preferably by means of a thermally conductive adhesive layer.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder comprises a preferably rotationally symmetrical plate-shaped base and a preferably rotationally symmetrical cylindrical part adjoining the base with a recess for receiving the temperature sensor, with the holder being introduced and arranged in the base body in this way that the plate-shaped base is oriented in the direction of the separating membrane.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder is also designed in such a way that a diameter of the plate-shaped base is larger than a diameter of the cylindrical part, so that an overhang is created which serves as a stop surface for the holder and the base body is further formed such that the central recess has a stepped opening on the side facing the separating membrane, which is formed such that a tread surface of the stepped opening serves as a counter-abutment surface for the abutment surface of the holder.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder also has a ventilation opening which is designed in the holder in such a way that air which is between the separating membrane and the surface of the holder which serves as a stop surface can preferably escape through the central recess .
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the base body and the separating membrane each have a metallic material.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the holder is connected to the surface on the separating membrane facing the separating membrane by means of a thermally conductive connecting layer, preferably a thermally conductive adhesive layer, a soft-soldered connecting layer or a thermally conductive paste layer.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that the central recess is realized by several bores with different diameters and preferably extends through the entire base body.
- a further advantageous embodiment of the pressure transmitter according to the invention provides that an intermediate space between the holder and a wall of the central recess is at least partially filled with a thermal insulation material, preferably a thermal insulation material other than air.
- the invention further relates to a pressure converter, comprising: a pressure transmitter according to one of the configurations described above and a pressure measuring cell, to which the pressure of the process medium can be applied via the hydraulic path of the pressure transmitter, as well as an electronic circuit for converting a primary signal of the pressure measuring cell into a processed pressure-dependent generate signal.
- the electronic circuit includes means for processing the signals of the temperature sensor for the measured temperature variable.
- a signal from the temperature sensor is present at the input of a correction circuit for correcting a temperature error in the pressure-dependent signal.
- Fig. 3 a detailed representation of the holder
- Fig. 4 Data obtained by simulation to illustrate the effect of the bracket on heat transfer.
- the pressure transducer shown in Figure 1 comprises a preferably metallic base body 1, in particular a stainless steel base body 1 with a surface 2 to which a disc-shaped separating membrane 3 is attached with a single peripheral outer weld seam 36 at its peripheral outer edge 32, whereby between the base body and the separating membrane 3 forms a pressure chamber 4 .
- the separating membrane 3 of this embodiment example is shown as a flat disc.
- the separating membrane can just as well have a wavy profile, i.e. have circumferential beads.
- a bore extends from the pressure chamber 4 through the body 1 to form a hydraulic path and transmit the pressure to a pressure receiver. So that the pressure can also be transmitted accordingly, the pressure chamber is filled with a transmission liquid 7, for example an oil.
- the components described so far relate to a pressure transmitter module which is combined with a pressure measuring cell in order to form the pressure converter according to the invention.
- the pressure measuring cell 110 can, for example, comprise a carrier body 111 to which a piezoresistive pressure measuring element 113 is attached.
- the pressure-measuring element 113 is preferably designed as a measuring diaphragm, which is deflected by the action of a pressure difference.
- the pressure measuring cell 110 can be designed as a relative pressure, differential pressure or absolute pressure measuring cell. In the embodiment shown in FIG. 1, the pressure measuring cell is designed as a relative pressure measuring cell. In this case, the pressure to be measured is applied to the pressure measuring cell via a channel 112 integrated in the carrier body 111 .
- the pressure measuring cell 11 serves as a pressure receiver of the hydraulic path realized through the channel 112 and a bore 5 connecting the channel 112 to the pressure chamber 4 .
- the primary signal of the pressure measuring cell 110 is first pre-processed by a circuit on a circuit board 14 before it is processed further and processed for communication using the standard protocols, for example 4-20 mA or digital field bus protocols.
- the pressure converter according to the invention also includes a temperature sensor 20, which is inserted in a central recess 80, 82 through the base body 1 of the pressure transmitter module to the back 34, i.e. the side of the separating membrane facing away from the process, in order to record the temperature of the process medium.
- a central recess here means a recess that extends along an axis of rotation related to an outer contour of the base body.
- the central recess can be realized, for example, by one or more bores. In the exemplary embodiment illustrated in FIGS. 1 and 2, the central recess is realized by a plurality of bores along the central axis of the base body.
- the primary signal of the temperature sensor 20, for example a PT1.000 sensor, is fed to the circuit board 14 via electrical lines 17 in order to be processed as a measurement signal and, if necessary, to be used to compensate for the primary signal of the pressure sensor.
- the temperature sensor 20 is inserted through the base body 1 of the diaphragm seal module up to the back and is therefore not in direct contact with the process medium, contamination of the medium by the temperature sensor 20, corrosion of the temperature sensor and interaction between the medium and the temperature sensor can occur 20 are excluded.
- Such a structure is particularly suitable for hygienic applications and/or with aggressive chemicals.
- the temperature sensor 20 is introduced according to the invention via a holder 130 which at least partially accommodates or encloses the temperature sensor 20 on the back of the separating membrane 3 .
- the holder 130 is made of a particularly good thermally conductive material.
- the holder 130 can be made of a material with a thermal conductivity greater than 200 [W/(m*K)], preferably greater than 300 [W/(m*K)], very particularly preferably greater than 400 [W/(m*K)]. be trained. Copper has proven to be a particularly preferred material for the holder 130 due to its good thermal conductivity.
- the holder 130 with the surface 133 directed towards the separating membrane can be connected to the back of the separating membrane 34 via a thermally conductive connecting layer 15 .
- the holder 130 can be rotationally symmetrical.
- the holder 130 can comprise an essentially rotationally symmetrical, plate-shaped base 131 and a cylindrical part 132 .
- the cylindrical part 132 preferably adjoins the plate-shaped base 131 in the middle.
- the holder can have a largely T-shaped outer contour in cross section.
- the cylindrical part of the holder 132 has a recess 136 for receiving the temperature sensor.
- the recess 136 extends from the end of the holder opposite the plate-shaped base to a defined depth T.
- the recess 136 can extend to the plate-shaped base.
- the recess 136 can be realized, for example, by a bore.
- the temperature sensor 20 can be fixed in the recess by means of a thermally conductive adhesive.
- the bracket 130 is formed such that a diameter of the plate-shaped base D1 is larger than a diameter of the cylindrical part D2.
- a stop surface 134 can be defined by the overhang of the plate-shaped base 131, with which the holder 130 can be inserted into the base body up to a counter-stop surface 11 formed in the base body.
- the counter-stop surface 11 can be implemented, for example, by a stepped opening 83 in the central recess on the side facing the separating membrane, with a tread surface serving as a counter-stop surface. In Fig. 3 the stepped opening is indicated by a circle.
- the central recess 80, 82 and the holder 130 are also matched to one another in such a way that a contact surface with which the holder is in direct contact with the base body is smaller than the surface of the holder which is in a plane with the separating membrane in the middle re I lies.
- the contact surface thus includes the counter-stop surface 11 and the side surface 12 of the stepped opening running perpendicular thereto.
- the holder 130 can have a ventilation opening 135, for example in the form of a bore.
- the ventilation opening 135 is designed in the holder 130 in such a way that air can escape through the ventilation opening 135 from an air gap resulting between the separating membrane and the plate-shaped base during the filling process of the pressure transmitter, which usually takes place in a vacuum.
- the separating membrane 3 preferably has a very small thickness in the range of approx Real-time fluctuations in the temperature of the process medium can be detected.
- the separating membrane 3 is joined to the base body around a central area 12 . This can be done, for example, by a circumferential weld. In FIGS. 1 and 2, the circumferential weld seam is indicated by two triangles and the reference number 35. Alternatively, the peripheral joining can also be effected by a peripheral adhesive connection 13 .
- thermal insulation material 9 in a space between the wall of the central recess 81 and the temperature sensor 20.
- the thermal insulation material can be air.
- a heat-insulating gel can be introduced.
- the heat-insulating gel can be, for example, a silicone gel, e.g. SilGel 612 from Wacker Chemie AG.
- Figure 4 shows data obtained by simulation to illustrate the effect of the mount on thermal conduction between the process medium and the temperature sensor.
- the temperature profile of the temperature sensor of a pressure transmitter designed according to the invention with the temperature profile of a temperature sensor of a pressure transmitter in which the temperature sensor is fixed to the separating membrane without a holder.
- the temperature sensor that is placed in the diaphragm seal with the bracket reaches the temperature setpoint (indicated by the line with unfilled circles in the measurement curve) more quickly than a temperature sensor that is installed in the diaphragm seal (indicated by the line with filled circles in the measurement curve) without a holder.
- Thermal insulation material e.g. air
- Pressure measuring element e.g. in the form of one that can be deflected by pressure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020122193.2A DE102020122193A1 (de) | 2020-08-25 | 2020-08-25 | Hydraulischer Druckmittler und Druckaufnehmer mit hydraulischem Druckmittler |
| PCT/EP2021/070512 WO2022042959A1 (de) | 2020-08-25 | 2021-07-22 | Hydraulischer druckmittler und druckaufnehmer mit hydraulischem druckmittler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4204783A1 true EP4204783A1 (de) | 2023-07-05 |
Family
ID=77155768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21748841.0A Withdrawn EP4204783A1 (de) | 2020-08-25 | 2021-07-22 | Hydraulischer druckmittler und druckaufnehmer mit hydraulischem druckmittler |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12359996B2 (de) |
| EP (1) | EP4204783A1 (de) |
| CN (1) | CN115943297A (de) |
| DE (1) | DE102020122193A1 (de) |
| WO (1) | WO2022042959A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10319417A1 (de) | 2003-04-29 | 2004-11-18 | Endress + Hauser Gmbh + Co. Kg | Druckaufnehmer mit Temperaturkompensation |
| DE102004052950A1 (de) * | 2004-10-29 | 2006-05-04 | Endress + Hauser Gmbh + Co. Kg | Druckaufnehmer mit hydraulischer Druckübertragung |
| DE102005035931B4 (de) * | 2005-07-28 | 2013-05-29 | Endress + Hauser Gmbh + Co. Kg | Hydraulischer Druckmittler und Druckwandler mit hydraulischem Druckmittler |
| US8047643B2 (en) * | 2008-09-03 | 2011-11-01 | Xerox Corporation | Temperature sensor mount for melt plate |
| DE102015110351A1 (de) * | 2015-06-26 | 2016-12-29 | Endress + Hauser Gmbh + Co. Kg | Druckübertragungsmodul und Druckmessaufnehmer mit einem Druckübertragungsmodul |
| DE102018123433A1 (de) * | 2018-09-24 | 2020-03-26 | Endress+Hauser SE+Co. KG | Hydraulischer Druckmittler und Druckaufnehmer mithydraulischem Druckmittler |
-
2020
- 2020-08-25 DE DE102020122193.2A patent/DE102020122193A1/de active Pending
-
2021
- 2021-07-22 US US18/042,938 patent/US12359996B2/en active Active
- 2021-07-22 EP EP21748841.0A patent/EP4204783A1/de not_active Withdrawn
- 2021-07-22 WO PCT/EP2021/070512 patent/WO2022042959A1/de not_active Ceased
- 2021-07-22 CN CN202180051736.XA patent/CN115943297A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20230314252A1 (en) | 2023-10-05 |
| CN115943297A (zh) | 2023-04-07 |
| DE102020122193A1 (de) | 2022-03-03 |
| WO2022042959A1 (de) | 2022-03-03 |
| US12359996B2 (en) | 2025-07-15 |
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