EP4385292A1 - Boîtier émetteur de dispositif de terrain - Google Patents

Boîtier émetteur de dispositif de terrain

Info

Publication number
EP4385292A1
EP4385292A1 EP22757231.0A EP22757231A EP4385292A1 EP 4385292 A1 EP4385292 A1 EP 4385292A1 EP 22757231 A EP22757231 A EP 22757231A EP 4385292 A1 EP4385292 A1 EP 4385292A1
Authority
EP
European Patent Office
Prior art keywords
section
rigid
circuit board
transmitter housing
flexible
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.)
Pending
Application number
EP22757231.0A
Other languages
German (de)
English (en)
Inventor
Robert Lalla
Werner Tanner
Martin Arnold
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
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 Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP4385292A1 publication Critical patent/EP4385292A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1462—Mounting supporting structure in casing or on frame or rack for programmable logic controllers [PLC] for automation or industrial process control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/0278—Rigid circuit boards or rigid supports of circuit boards locally made bendable, e.g. by removal or replacement of material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
    • H05K2201/0999—Circuit printed on or in housing, e.g. housing as PCB; Circuit printed on the case of a component; PCB affixed to housing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/13—Moulding and encapsulation; Deposition techniques; Protective layers
    • H05K2203/1305—Moulding and encapsulation
    • H05K2203/1327—Moulding over PCB locally or completely

Definitions

  • the invention relates to a transmitter housing of a field device used in automation technology.
  • field devices are often used that are used to determine, monitor, optimize and/or influence, in particular, variable process variables.
  • Sensors that record process variables such as fill level, flow rate, pressure, temperature and conductivity are used to record the process variables.
  • Actuators such as valves or pumps, are used to influence process variables, by means of which the flow of a liquid in a pipeline section or the fill level in a container can be changed.
  • field devices are also understood to mean remote I/Os, radio adapters or devices in general that are arranged at the field level. A large number of such field devices are manufactured and sold by the applicant.
  • Field devices often have a sensor unit that is in particular at least temporarily and/or at least partially in contact with a process medium, which is used to generate a signal that is dependent on the process variable.
  • field devices often have a connection/electronic unit arranged in a transmitter housing.
  • the transmitter housing is, for example, permanently connected to the sensor unit.
  • the connection-ZEIelectronic unit serves to process and/or forward the signals, especially electronic signals, generated by the sensor unit.
  • the connection cell electronic unit comprises at least one printed circuit board with components arranged thereon. Cables can be connected to the connecting ZEIktronics unit for transmitting the forwarded signals to a superordinate unit and/or for supplying the field device with the electrical energy required for its operation.
  • connection ZEI electronics unit Spatial separation of different areas of the connection ZEI electronics unit is often desired, into an accessible connection area and an inaccessible electronics area. In this way, the electronics area is protected when working on the connection area.
  • this spatial separation is achieved, for example, by using a multi-chamber housing in which the electronics area and the connection area are accommodated in chambers that are spatially separate from one another and have separate openings are.
  • This is not always possible for some field devices, or in certain cases it is preferable to use a single-chamber housing. This is more cost-effective and only one opening with a cover may have to be used. This is advantageous, for example, for use in areas with strict hygiene requirements.
  • the invention is therefore based on the object of specifying a simple way of spatially separating different areas of the connection ZEI electronic unit for a single-chamber housing.
  • a transmitter housing of a field device used in automation technology the transmitter housing being a single-chamber housing with an opening
  • the field device comprising a printed circuit board arranged in the transmitter housing, which printed circuit board has: a first rigid and flat section and a second rigid and planar section; at least one flexible and curved section; wherein the two rigid sections are only connected to one another via the at least one flexible, curved section, the first rigid section being accessible from the opening and forming a connection area which has at least one connection element for connecting at least one cable, and the first rigid Section and the second rigid section are arranged at a first angle between 60 ° and 120 °, in particular between 80 ° and 100 ° to each other.
  • the two rigid sections are perpendicularly similar or even substantially perpendicular to each other.
  • the field device of automation technology includes the circuit board arranged in the transmitter housing of the field device.
  • the second section of the circuit board forms an electronics area. Due to the angled arrangement in relation to the first section, it is inaccessible from the opening and is protected against access when the opening is open.
  • the at least one cable is used, for example, to supply the field device with electrical energy and/or to transmit information between the field device and/or a higher-level unit connected to it.
  • Printed circuit boards that have a plurality of rigid printed circuit board areas that are connected via a flexible printed circuit board area are known from the prior art. A distinction is made between rigid-flex and semi-flex printed circuit boards. Rigid-flex printed circuit boards have rigid sections that are connected to one another via a flexible section and that can essentially be arranged in any way with respect to one another.
  • a semi-flexible area is produced by defined depth milling of an intermediate area from a uniform starting circuit board.
  • the rigid sections lying in the plane of the starting printed circuit board can then be arranged at virtually any desired angle to one another by bending the semi-flexible area.
  • Semiflex printed circuit boards offer significant cost advantages in production compared to the classic rigid-flex printed circuit board based on polyimide. For example, the Semiflex printed circuit board no longer requires any special thermal pre-treatment due to its usually polyimide-free structure.
  • the Semiflex technology is particularly suitable for applications where there is no dynamic load on the curved, flexible section. This is the case here because the bent, flexible section of the printed circuit board is generally bent only once, namely before the printed circuit board is installed in the transmitter housing.
  • the printed circuit board is therefore preferably a semiflex printed circuit board of this type.
  • the transmitter housing has a removable cover, by means of which the opening can be closed.
  • the cover can be screwed to a housing part that corresponds to the cover.
  • the single-chamber housing has exactly one opening.
  • the plane of the opening is substantially parallel to the plane of the first rigid portion.
  • the first section is optimally accessible via the opening
  • the transmitter housing has at least two flexible, curved sections.
  • the at least two curved, flexible sections are arranged essentially parallel to one another.
  • the flexible sections point in a transverse direction, which transverse direction is essentially perpendicular to a connection direction, along which connection direction the sections of the printed circuit board, namely the first rigid section, the flexible sections and the second rigid section, are connected to one another , has a width smaller than the width of the first rigid section and/or the second rigid section, and in particular in the transverse direction is at most 0.5, preferably at most 0.3 times as wide as the first rigid section and/or the second rigid section.
  • the printed circuit board has exactly two flexible sections, each of which connects two outer edge regions of the two rigid sections to one another.
  • the printed circuit board has a cutout, which cutout extends
  • circuit board has at least two flexible sections, between mutually unconnected areas of the first rigid section and the second rigid section.
  • the recess is, for example, milled into the printed circuit board.
  • the milling of the recess in the printed circuit board is preferably carried out as part of the depth milling to produce the flexible section in the case of the semiflex printed circuit board mentioned above.
  • the recess only extends between the flexible section and the second section.
  • the second rigid section has a projection delimited by the recess, the projection having at its first end a front edge facing the first section which closes off the projection, at its second end opposite the first end a base having, at which base the projection connects to the remaining portion of the second rigid section without projection, the base being adjacent to the junction between the second rigid section and the at least one flexible section, and the leading edge outside of the Contour of the flexible portion is located and facing the opening so that the projection is accessible from the opening.
  • front edge refers only to the front end of the projection, which faces the first section. It does not imply that this degree must necessarily be straight; the leading edge can also be curved, for example.
  • the protrusion lies outside the contour of the flexible termination and therefore extends in a space above the curved surface of positive curvature of the arcuate flexible portion.
  • the projection protrudes in such a way that it is accessible from the opening.
  • additional components accessible from there, such as further connection elements, can also be accommodated on the projection of the second section.
  • the at least one flexible curved section is bent essentially with a constant curvature that can be described using a radius of curvature, so that it is in the shape of a segment of a circle in relation to an imaginary center point of a circle.
  • the angle swept by the segment of a circle, flexible curved section corresponds to the aforementioned first angle between the first and second rigid section. It is therefore also between 60° and 120°, in particular between 80° and 100°.
  • the length of the projection from the base to the front edge is dimensioned as a function of the radius of curvature in such a way that a second angle between a vector pointing from the center of the circle to the base and a vector pointing from the center of the circle to the front edge is between 10° and 80°, in particular between 15° and 50°.
  • connection element is arranged on the projection.
  • At least one operable switching element is arranged on the first section and/or the projection of the second section.
  • the transmitter housing is at least partially electrically conductive and has an electrically conductive web extending into the interior of the housing, with a connecting element comprising an electrically conductive fastening means being arranged on the first section, for fastening the printed circuit board to the web, wherein to the connecting element, a grounding cable can be connected to the transmitter housing in such a way that the grounding cable is connected by means of the Fastening means is electrically conductively connected to the web when being fastened to the web, for shielding the transmitter housing.
  • the fastening means is designed, for example, as a metal screw or clamp. It is used for the simultaneous attachment of the printed circuit board to the bridge and the electrical shielding of the transmitter housing; the latter using a ground wire connected by means of the fastener.
  • At least one area of the circuit board is essentially completely encapsulated, which completely encapsulated area comprises the second rigid section of the circuit board without the protrusion.
  • the encapsulated area is encapsulated, for example, by means of a housing body and possibly also with an additional encapsulation.
  • the printed circuit board is essentially completely encapsulated, except for the connection element(s) and, if present, for the switching element(s).
  • 1a, 1b, 1c A plan view of the printed circuit board before the bending of the flexible, bent section, in different configurations of the printed circuit board in each case;
  • 3a, 3b A perspective view of the printed circuit board and a side view of the printed circuit board in an embodiment of the invention.
  • FIGS. 1a to 1c show top views of a printed circuit board 2 in different configurations that are used in the solution according to the invention.
  • the circuit boards 2 are shown in the plan views from FIGS. 1a to 1c with a flexible section 20a; 20b that has not yet been bent, so that all sections 21, 22, 20a; 20b of the circuit board 2 lie in one plane.
  • the printed circuit board 2 with the at least one flexible bendable (or then bent within the scope of the invention) sections 20a; 20b is preferably configured as a semiflex printed circuit board.
  • a flexible section 20a; 20b,... is obtained by depth milling the section 20a; 20b from a unitary starting circuit board.
  • the two rigid sections 21, 22 are exclusively connected to one another via the flexible section 20a; 20b, . . .
  • the printed circuit board 2 includes exactly one flexible section 20a.
  • the printed circuit board 2 comprises exactly two flexible sections 20a, 20b, which connect edge regions of the two rigid sections 21, 22 to one another.
  • a recess 6 is arranged between the two rigid sections 21 , 22 .
  • the recess 6 extends between unconnected areas of the two rigid sections 21, 22 and between the flexible sections 20a, 20a, respectively.
  • the flexible sections 20a, 20b are preferably narrower than the rigid sections 21, 22 in the transverse direction QR, which is perpendicular to a connection direction VR of the sections 21, 20a, 20b, 22 of the circuit board 2.
  • the flexible section is only 0.3 times as wide in the transverse direction QR as each of the rigid sections 21,22.
  • the rigid sections 21, 22 are here each the same width in the transverse direction QR. If there are several flexible sections 20a, 20b, . . . , the flexible sections 20a, 20b, . . . are preferably arranged essentially parallel to one another.
  • the printed circuit board 2 essentially corresponds to the design of the printed circuit board shown in FIG.
  • the recess 6 therefore extends in FIG. 1c between the second rigid section 22 and the two flexible sections 20a, 20b.
  • the projection merges at a base 72 with the remaining area of the second rigid section 22 and terminates at an end facing the first rigid section 21 with a front edge 71 .
  • the front edge 71 does not necessarily have to be straight as shown here.
  • the recess 6 is essentially C-shaped here.
  • FIG. 3a shows a perspective view of such a printed circuit board 2 with a projection 71 of the second rigid section 22, delimited by a cutout 6, in which the flexible sections 20a, 20b are bent.
  • the first rigid section 21 and the second rigid section 22 are arranged substantially perpendicular to one another, ie at a first angle alpha of 90° to one another.
  • Different connection elements 4, 42, 43, 44 are arranged on the first section 21, including, for example, a four-pole connection element 43.
  • One of the connection elements 42 includes a fastening means 9 (here a metal screw) for connecting a grounding cable.
  • a further connection element 41 is arranged on the projection 7 .
  • Fig. 2 shows an arrangement of an embodiment of a printed circuit board 2 according to the invention within a single-chamber transmitter housing 1.
  • the printed circuit board 2 does not include a projection 7 for the sake of clarity that the first rigid section 21 with the connection elements 4, 42, 43, 44 is easily accessible from an opening 3 of the transmitter housing 1, e.g. by the plane of the opening 3 being parallel to the plane of the first rigid section 21. If the cover 5 of the transmitter housing 1 is unscrewed, connection work can be carried out on the connection elements 4, 42, 43, 44, the components arranged on the second rigid section 22 being protected from access by the essentially right-angled arrangement.
  • connection element 42 also shows the attachment of the attachment means 9 of the connection element 42 to an electrically conductive web 12 of the transmitter housing 1, which extends into the interior of the housing.
  • connection element 42 When a grounding cable is connected to the connection element 42 and an at least partially electrically conductive transmitter housing 1, the transmitter housing 1 is shielded. Shielding and additional attachment of the printed circuit board 2 to the web 12 are preferably made possible at the same time--whereby, of course, further attachment means serving only the mechanical attachment of the printed circuit board 2 in the transmitter housing 1 can be provided for safety.
  • the second rigid section 22 also includes the projection 7, as shown in FIG. 3a, the components arranged thereon continue to be accessible. Since the front edge 71 lies outside the contour of the flexible section 20a, the space can be optimally utilized as a result.
  • an additional connector plug element 41 is arranged on the projection 7, which is itself angled.
  • Such connection plug elements can be arranged excellently on the projection 7 . Irrespective of the respective configuration, in the solution according to the invention all components arranged on the further area of the second section 22 (i.e. outside of the projection 7) are still protected against access during connection work on the connection area.
  • 3b again shows a side view of the printed circuit board 2 with the bent, flexible sections 20a, 20b.
  • the flexible section is in the form of a segment of a circle, its shape being able to be described using a radius of curvature KR of a constant curvature in relation to an imaginary center point MP.
  • the swept angle of the Circle segment corresponds to the first angle alpha mentioned above.
  • the front edge 71 of the projection 7 can protrude from the contour in such a way that it penetrates the plane of the first rigid section 21, as is the case in FIG. 3a.
  • a shorter projection 7 can also terminate with its front edge 71 in front of the plane of the second rigid portion 21.
  • the length of the projection 7 from the base 72 to the front edge 71 can be described using a second angle beta, which lies between the vector from the center point MP to the front edge 71 and the vector from the center point MP to the base 72 .
  • the second angle beta is preferably between 15° and 50° and is, for example, 30°.
  • the length of the vector center point MP -basis 72 corresponds to the radius of curvature KR of the specified, constant curvature of the flexible sections 20a, 20b, with the curvature always being the same if there are several flexible sections 20a, 20b which are parallel to one another. With a given radius of curvature KR and center point MP, the length of the projection 7 can therefore be described using the second angle beta.
  • the substantially right-angled arrangement of the two rigid sections 21, 22 relative to one another shown in FIGS. 2, 3a, 3b is particularly suitable within the scope of the invention for the type of transmitter housing 1 shown in FIG.
  • transmitter housings 1 are also used which are themselves angled, in which e.g. the plane of the opening 3 runs slightly obliquely in relation to an otherwise cylindrical transmitter housing 1.
  • an arrangement of the two rigid sections 21, 22 is also adapted to the shape of the transmitter housing 1 and the first angle alpha is correspondingly larger and is 100°, for example.
  • Fig. 4 shows the encapsulation of the printed circuit board 2 in a housing body 13.
  • the second rigid section 22 again has no projection 7 for the sake of clarity, the invention also comprising the combination of the embodiment with the projection 7 and the housing body 13 .
  • the first section 21 includes a switching element 8.
  • a switching element can also be arranged on the projection.
  • the circuit board 2 is essentially completely encapsulated by the housing body 13 . Only the connection elements 4,42,43,44 and the switching element 8 on the first section 21 remain free of the encapsulation.
  • the housing body 13 can also be filled with casting compound.
  • the housing body 13 is then arranged completely in the single-chamber transmitter housing 1 in such a way that the first section 21 of the circuit board 2 is accessible from the opening 3 of the transmitter housing 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Automation & Control Theory (AREA)
  • Casings For Electric Apparatus (AREA)

Abstract

L'invention concerne un boîtier émetteur (1) d'un dispositif de terrain d'automatisation, le boîtier émetteur (1) étant un boîtier à chambre unique ayant une ouverture (3). Le dispositif de terrain comprend une carte de circuit imprimé (2) disposée dans le boîtier émetteur (1), la carte de circuit imprimé comprenant : - une première section rigide et plate (21) et une seconde section rigide et plate (22) ; - au moins une section flexible et courbée (20a, …) ; les deux sections rigides (21, 22) étant reliées l'une à l'autre uniquement via ladite au moins une section courbée flexible (20a, …), la première section rigide (21) étant accessible depuis l'ouverture (3) et formant une région de liaison comprenant au moins un élément de liaison (4) pour relier au moins un câble, et la première section rigide (21) et la seconde section rigide (22) étant disposées l'une par rapport à l'autre selon un premier angle (alpha) compris entre 60° et 120°, en particulier entre 80° et 100°.
EP22757231.0A 2021-08-11 2022-07-22 Boîtier émetteur de dispositif de terrain Pending EP4385292A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021120971.4A DE102021120971A1 (de) 2021-08-11 2021-08-11 Transmittergehäuse eines Feldgeräts
PCT/EP2022/070613 WO2023016777A1 (fr) 2021-08-11 2022-07-22 Boîtier émetteur de dispositif de terrain

Publications (1)

Publication Number Publication Date
EP4385292A1 true EP4385292A1 (fr) 2024-06-19

Family

ID=82942696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22757231.0A Pending EP4385292A1 (fr) 2021-08-11 2022-07-22 Boîtier émetteur de dispositif de terrain

Country Status (4)

Country Link
EP (1) EP4385292A1 (fr)
CN (1) CN117813922A (fr)
DE (1) DE102021120971A1 (fr)
WO (1) WO2023016777A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4569376B2 (ja) * 2005-05-12 2010-10-27 日立電線株式会社 光トランシーバ
DE102009007270A1 (de) * 2009-02-03 2010-08-05 Wabco Gmbh Schaltungsmodul, insbesondere Steuerungsmodul für ein Fahrdynamikregelsystem
DE102012207599B4 (de) 2012-05-08 2022-03-17 Vitesco Technologies GmbH Steuergerät, insbesondere für ein Kraftfahrzeug
JP6930685B2 (ja) 2016-12-27 2021-09-01 イー インク コーポレイション 表示装置用回路基板、表示装置および電子機器
DE102017115260A1 (de) * 2017-07-07 2019-01-10 Krohne Messtechnik Gmbh Messgerät und Verfahren zur Herstellung eines Messgeräts
DE102019107750A1 (de) 2019-03-26 2020-10-01 Küster Holding GmbH Verstellantrieb für die motorische Verstellung eines Verstellelements sowie Verfahren zur Montage eines Verstellantriebs
EP4025874B1 (fr) * 2019-09-05 2023-11-01 Fraba B.V. Dispositif de mesure d'angle de rotation, système de mesure d'angle de rotation et moteur électrique

Also Published As

Publication number Publication date
CN117813922A (zh) 2024-04-02
DE102021120971A1 (de) 2023-02-16
WO2023016777A1 (fr) 2023-02-16

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