WO2025141006A1 - Fluid conduit system, and measuring transducer or measuring device formed therewith - Google Patents

Abstract

The invention relates to a fluid conduit system comprising fluid conduits (100, 200, 300, 400), of which both fluid conduit (100) and fluid conduit (400) each have a lumen which is enclosed by a wall and which in each case extends from a first flow opening located in a first conduit end to both a second flow opening located in a second conduit end and to a third flow opening located in the second conduit end and spaced apart from said second flow opening, and of which both fluid conduit (200) and fluid conduit (300) each have a lumen which is enclosed by a wall and which in each case extends from a first flow opening located in a first conduit end to a second flow opening (200b) located in a second conduit end. Fluid conduit (200) and fluid conduit (300) are each connected with their respective conduit ends to one of the second conduit ends of fluid conduit (100) or fluid conduit (400) in order to form fluidically parallel-connected flow paths. The fluid conduit system also comprises a support frame (1000) which is at least in sections tubular, namely in the form of a hollow body having a greater extent in a longitudinal direction compared to a largest calibre (internal diameter), and which has a (frame) internal space which is enclosed at least in part by a wall and which extends from a frame opening (1000a) located in an (end-face) frame end (1000+) to a second, in particular circular, frame opening (1000b) located in an (end-face) second frame end (1000#) of said support frame (1000). The walls of fluid conduit (100) and of fluid conduit (400) each form, on an outer side, an external cone that tapers towards their respective first conduit ends, whilst the wall of the support frame forms, on an inner side, both in the region of frame end (1000+) and in the region of frame end (1000#), an internal cone that tapers towards the adjacent frame end. Fluid conduit (100) and fluid conduit (400) are each inserted into the support frame (1000) in such a way that their respective external cones are in surface contact with one of the internal cones.

Description

Fluid line system and the measuring transducer or measuring device formed thereby

The invention relates to a fluid line system formed by four fluid lines and a holding frame, as well as a measuring transducer or a corresponding measuring device formed thereby.

Fluid line systems of the type in question as well as the use of such fluid line systems in a measuring transducer used to measure at least one measured variable of a fluid medium conveyed in a pipeline or in a (vibronic) measuring device formed therewith, such as a Coriolis mass flow meter, are described, inter alia, in US-A 57 96 011,

US-A 2015/0082916, US-B 1 07 05 055, US-B 1 08 09 109, WO-A 2015/162617, WO-A 2017/048235, WO-A 2022/100836 or WO-A 2023/131475. Each of the aforementioned fluid line systems comprises a first fluid line (constructed as a line branch, occasionally also referred to as a distributor, collector or Y-piece or also as a flow divider) with a lumen encased in a (metal) wall and extending from a circular first flow opening located in an associated first line end, in particular one enclosed by a connecting flange, both to a second flow opening located in a second line end of the same first fluid line, in particular a circular, semicircular or oval-shaped second flow opening, as well as to a third flow opening spaced from the same second flow opening, also located in the second line end, in particular a circular, semicircular or oval-shaped third flow opening, a second fluid line constructed as a rigid, at least partially (circular) cylindrical tube with a lumen encased in a (metal) wall and extending from a second flow opening located in an associated first line end, in particular circular, semicircular or oval-shaped, first flow opening to a lumen located in an associated second line end, in particular circular, semicircular or oval-shaped, second flow opening extending lumen, at least one third fluid line designed as a rigid, at least partially (circular) cylindrical tube and structurally identical to the second fluid line, with a lumen surrounded by a (metal) wall and extending from a lumen located in an associated first line end, in particular circular, semicircular or oval-shaped, first flow opening to a lumen located in an associated second line end, in particular circular, semicircular or oval-shaped, second flow opening, and a fourth fluid line (structurally identical to the first fluid line and serving as a line union) with a lumen surrounded by a (metal) wall and extending from a lumen located in an associated, in particular connecting flange, first pipe end, in particular circular, first flow opening both up to a second flow opening located in an associated second pipe end, in particular circular, semicircular or oval-shaped, as well as up to a second flow opening spaced from the same second flow opening a third flow opening, in particular a circular, semicircular, or oval-shaped lumen, also located in the second line end. The walls of the first and fourth fluid lines and/or the second and third fluid lines are typically made, at least in pairs, of the same material, for example, namely a stainless steel, for example a stainless steel, a duplex steel, or a super duplex steel. Furthermore, the second and third flow openings of the first and fourth fluid lines can each be circular, but also, as shown, for example, in WO-A 2017/048235 or WO-A 2017/198440, oval-shaped, or even, as shown, for example, in WO-A 2017/105493, semicircular or circular segment-shaped. The second and third fluid lines of fluid line systems of the type in question are also typically of identical construction and/or are designed in sections in a (circular) arc shape, for example in such a way that the second and third fluid lines, as shown, inter alia, in the figure, each have at least one (circular) arc-shaped central sub-segment, to which a straight sub-segment is connected on the inlet and outlet sides, so that the second and third fluid lines are designed essentially in a U- or V-shape, respectively.

In order to form flow paths that are connected in parallel in terms of flow technology, in the aforementioned fluid line systems, both the second fluid line and the third fluid line are each connected with their respective first line end to the second line end of the first fluid line, such that each of the lumens of the second and third fluid lines communicates with the lumen of the first fluid line and that the first flow opening of the second fluid line opens into the second flow opening of the first fluid line and the first flow opening of the third fluid line opens into the third flow opening of the first fluid line, and moreover, both the second fluid line and the third fluid line are each connected with their respective second line end to the second line end of the fourth fluid line, such that each of the lumens of the second and third fluid lines communicates with the lumen of the fourth fluid line and that the second flow opening of the second fluid line opens into the second flow opening of the fourth fluid line and the second flow opening of the third fluid line opens into the third flow opening of the fourth fluid line. Advantageously, the second and third fluid lines are also usually arranged such that the same fluid line or its lumens run parallel to each other at least in sections, in particular predominantly or continuously. Each of the aforementioned fluid line systems is also particularly intended or configured to be inserted into the course of the aforementioned pipeline in such a way that a fluid flow supplied to the fluid line system or the measuring transducer formed thereby is divided into two separate fluid flows by means of the first fluid line, thus within the fluid line system or measuring transducer, and that the same fluid flows are recombined into a single fluid flow by means of the fourth fluid line, thus also within the fluid line system, so that the The fluid line system acts as a single pipe in terms of flow and externally and can also be connected to the corresponding segments of the pipeline very easily and without any further technical effort using (standard) flange connections.

In addition to the aforementioned fluid lines, the fluid line systems shown in US-B 1 07 05 055, US-B 1 08 09 109, WO-A 2015/162617, WO-A 2022/100836 or WO-A 2023/131475 each also comprise a holding frame, in particular designed as a protective housing or designed as a component of a protective housing, with a (frame) interior that is at least partially enclosed by a (metal) wall and extends from a (circular) first frame opening located in a (front-side) first frame end of the holding frame to a (circular) second frame opening located (diametrically) away from the first frame end in the longitudinal direction. As shown, inter alia, in US-B 1 07 05 055, WO-A 2022/100836 or WO-A 2023/131475, the holding frame of a fluid line system of the type in question can be at least partially, in particular predominantly, tubular, namely as a (cylindrical or prismatic) hollow body with a larger extension in a longitudinal direction compared to a largest caliber (inner diameter), for example by means of a substantially circular first and second frame openings and/or monolithic (support) tube. Not least for the aforementioned case that the second and third fluid lines are arcuate in sections, the respective holding frame can, for example, also have first and second (wall) openings formed in the respective wall and both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the first fluid line (at least in sections straight) and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the first fluid line (at least in sections straight) can be guided through the first (wall) opening and both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the fourth fluid line (at least in sections straight) and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the fourth fluid line (at least in sections straight) can be guided through the second (wall) opening. Not least in the aforementioned case that the fluid line system is a component of a measuring transducer or a (vibronic) measuring device formed therewith, the holding frame is typically an (integral) component of a protective housing of the fluid line system or is developed into such a protective housing; this is typically such that a first housing end of the protective housing is formed by means of the first fluid line, a second housing end of the protective housing is formed by means of the fourth fluid line, and a side wall of the protective housing laterally delimiting the (frame) interior is formed by means of the (metal) wall, wherein the (metal) wall is laterally connected both to the first Fluid line, in particular namely its first line end, as well as on the fourth fluid line, in particular namely its first line end, or is connected thereto in a materially bonded manner, and that a cavity of the protective housing is formed by means of the (frame) interior, and that the second and third fluid lines are placed within the cavity of the protective housing in such a way that each of the second and third fluid lines is spaced from the side wall of the protective housing.

Fluid line systems of the type in question can, as already mentioned and inter alia in the above-mentioned US-A 57 96 011, US-A 2015/0082916, US-A 2019/0277683, US-B 10 809 109, US-B 10 705 055, WO-A 2006/107297, WO-A 2015/162617, WO-A 2017/048235,

WO-A 2017/105493, WO-A 2020/023056, WO-A 2022/100836 or WO-A 2023/131475, respectively, can also be designed as a component of a, for example vibronic, measuring transducer, which serves or is designed to generate at least one measuring signal corresponding to at least one measured variable - for example a mass flow (mass flow rate), a density or a viscosity - of the fluid flowing through, namely at least one signal parameter dependent on the same measured variable - for example a signal level dependent on the same measured variable and/or a signal frequency dependent on the same measured variable and/or a phase angle dependent on the same measured variable. This measuring transducer, in turn, can be connected to corresponding measuring device electronics to form a (vibronic) measuring device, for example, a Coriolis mass flow meter, a vibronic density meter, and/or a vibronic viscosity meter. Accordingly, in fluid line systems of the type in question, the respective second and third fluid lines can also be configured, in particular, to allow the medium to be measured to flow through them and, during this time, to be vibrated to generate the at least one measurement signal. Typically, the measurement signal used is at least one vibration measurement signal representing vibrational movements of the second and/or third fluid lines, with at least one signal frequency dependent on a density of the medium conveyed in the fluid lines and/or a phase angle dependent on a mass flow rate. To excite or maintain mechanical vibrations of the fluid lines, for example, namely, opposite bending vibrations of the second and third fluid lines, such a fluid line system or the measuring transducer formed thereby further comprises at least one electromechanical, for example, electrodynamic, vibration exciter. Furthermore, such a fluid line system or the measuring transducer formed thereby has at least one vibration sensor, for example, attached at least to the second and/or the third fluid line and/or at least placed in their vicinity, for generating the at least one measurement signal corresponding to the measured variable. Not least for the aforementioned case that the measuring transducer or the measuring device formed thereby is intended to measure a mass flow or a To measure the mass flow of the fluid flowing through, such a fluid line system can also comprise at least two vibration sensors which are mounted at a distance from one another on the second and/or third fluid line and/or at least placed in the vicinity thereof, and which may also be of identical construction, and which are each configured to generate a measurement signal corresponding to the measured variable, in particular in such a way that a phase difference which is dependent on the mass flow rate is established between the two measurement signals. In order to determine the measured variable, the second and third fluid lines of such vibronic measuring transducers are typically actively excited to opposite bending vibrations in a drive or useful mode, namely to vibrations at at least one vibration frequency that serves as a useful frequency for the measurement, for example at one or more instantaneous resonance frequencies of natural vibration modes inherent in the fluid line system and/or by means of an electronic driver circuit provided in the aforementioned measuring device electronics, electrically coupled to the at least one vibration exciter and also to the at least one vibration sensor, possibly designed as a phase-locked control loop (PLL). Such fluid line systems or vibronic measuring transducers formed therewith, for example those used to generate Coriolis forces dependent on a mass flow of the flowing fluid, are also manufactured by the applicant itself or in conjunction with suitably configured measuring electronics as Coriolis mass flow meters or as Coriolis mass flow density meters, for example under the trade names "PROMASS F 200", "PROMASS G 100", "PROMASS O 100", "PROMASS 83E", "PROMASS 84F", "CNGmass", "LPGmass" or "Dosimass".

As discussed, among other things, in WO-A 2015/162617, fluid line systems of the type in question can be comparatively cost-intensive due to the high material input required. Furthermore, the comparatively complicated assembly of the components can represent a significant cost factor in manufacturing; this is especially true when the fluid line system to be manufactured is intended for use in a (vibronic) measuring device, and accordingly, in order to avoid misalignments that reduce the measuring accuracy of the measuring device, extremely high demands are placed on the precision of the components and their assembly. Based on the aforementioned prior art, one object of the invention is to improve the mechanical structure of fluid line systems of the type in question, in particular to the extent that their assembly is simplified or that increased precision can be achieved during their manufacture (with reasonable effort).

To achieve the object, the invention consists in a fluid line system comprising:

• a first fluid line, for example designed as a line branch, with a lumen surrounded by a wall, for example made of a metal, and extending from a first flow opening, for example circular, located in a first line end of the first fluid line, for example held by a connecting flange, both to a second flow opening, for example circular, semicircular or oval, located in a second line end of the same first fluid line and to a third flow opening, for example circular, semicircular or oval, located at a distance from the second flow opening in the second line end of the same first fluid line;

• a second fluid line, for example designed as a rigid and/or at least partially circular-cylindrical tube and/or monolithic, with a lumen surrounded by a wall, for example made of a metal, and extending from a first flow opening, for example circular, semicircular or oval-shaped, located in a first line end of the second fluid line, to a second flow opening, for example circular, semicircular or oval-shaped, located in a second line end of the same second fluid line;

• at least one third fluid line, for example designed as a rigid and/or at least partially circular-cylindrical tube and/or monolithic and/or structurally identical to the second fluid line, with a lumen surrounded by a wall, for example made of a metal, and extending from a first flow opening, for example circular, semicircular or oval-shaped, located in a first line end of the third fluid line to a second flow opening, for example circular, semicircular or oval-shaped, located in a second line end of the same third fluid line; • a fourth fluid line, for example identical in construction to the first fluid line and/or serving as a line connection, with a lumen surrounded by a wall, for example made of a metal, and extending from a first flow opening, for example circular, located in a first line end of the fourth fluid line, for example held by a connecting flange, both to a second flow opening, for example circular, semicircular or oval, located in a second line end of the same fourth fluid line and to a third flow opening, for example circular, semicircular or oval, located at a distance from the second flow opening in the second line end of the same fourth fluid line;

• and a holding frame, for example designed as a protective housing or as a component of a protective housing, at least in sections, for example predominantly, tubular, namely designed as a hollow body with a larger extension in a longitudinal direction compared to a largest caliber (inner diameter), with a (frame) interior space which is at least partially enclosed by a wall, for example made of a metal, which has (wall) openings, for example, and which extends from a first frame opening, for example circular, located in a (frontal) first frame end of the holding frame to a second frame opening, for example circular, located in a (frontal) second frame end of the same holding frame which is diametrically distant from the first frame end in the longitudinal direction;

• wherein both the second fluid line with its first line end and the third fluid line with its first line end are each connected to the second line end of the first fluid line, for example in such a way that both the lumen of the second fluid line and the lumen of the third fluid line communicate with the lumen of the first fluid line and/or in such a way that the first flow opening of the second fluid line opens into the second flow opening of the first fluid line and the first flow opening of the third fluid line opens into the third flow opening of the first fluid line; • wherein both the second fluid line with its second line end and the third fluid line with its second line end are each connected to the second line end of the fourth fluid line, for example in such a way that both the lumen of the second fluid line and the lumen of the third fluid line communicate with the lumen of the fourth fluid line and/or in such a way that the second flow opening of the second fluid line opens into the second flow opening of the fourth fluid line and the second flow opening of the third fluid line opens into the third flow opening of the fourth fluid line;

• wherein the wall of the first fluid line forms, on an outer side facing away from its lumen, an outer cone which tapers towards the first line end of the same fluid line, for example which is at least partially conical;

• wherein the wall of the fourth fluid line forms, on an outer side facing away from its lumen, an outer cone which tapers towards the first line end of the same fluid line, for example which is at least partially conical;

• wherein the wall of the holding frame forms, on an inner side facing the (frame) interior, in the region of the first stand, a first inner cone (of the holding frame) which tapers towards the first stand, for example, is at least partially conical, and in the region of the second stand, a second inner cone (of the holding frame) which tapers towards the second stand, for example, is at least partially conical;

• wherein the first fluid line is inserted into the holding frame in such a way that the outer cone (of the first fluid line) and the first inner cone (of the holding frame) contact each other flatly, for example forming a force-fitting and/or material-fitting and/or form-fitting connection between the first fluid line and the holding frame;

• and wherein the fourth fluid line is inserted into the holding frame in such a way that the outer cone (of the fourth fluid line) and the second inner cone (of the holding frame) contact one another over a large area, for example to form a force-fitting and/or material-fitting and/or form-fitting connection between the fourth fluid line and the holding frame. Furthermore, the invention also consists in a measuring transducer formed by means of such a fluid line system, for example a vibronic measuring transducer, for detecting at least one measured variable of a flowing medium and for generating at least one measuring signal corresponding to the at least one measured variable, for example a vibration signal.

Furthermore, the invention also consists in a measuring device formed by means of such a measuring transducer and measuring device electronics electrically connected to the measuring transducer and used to process the at least one measurement signal. The measuring device can be used in particular to determine measured values for at least one measured variable - for example, a mass flow rate, a mass flow, a volume flow rate, a volume flow, a density, a viscosity, or a temperature - of a fluid medium conveyed in a pipeline, for example a gas, a liquid, or a dispersion, for example in such a way that the first fluid line is arranged on the inlet side with respect to a flow direction of the medium flowing through the measuring transducer and/or in such a way that the medium flowing in a predetermined flow direction through the pipeline and the measuring transducer integrated into the same pipeline.

According to a first embodiment of the fluid line system of the invention, it is further provided that the holding frame is formed by means of at least two materially connected, for example tubular, (frame) sub-segments, for example in such a way that the first frame end is formed by means of a first sub-segment and the second frame end is formed by means of a second sub-segment.

According to a second embodiment of the fluid conduit system of the invention, it is further provided that the first frame end is formed by a first sub-segment, for example, a tubular and/or monolithic, and the second frame end is formed by a second sub-segment, for example, a tubular and/or monolithic and/or structurally identical to the first sub-segment, for example, such that a central region of the holding frame is formed by a (tubular) third sub-segment that is integrally connected to the first and second sub-segments. Further developing this embodiment of the invention, it is further provided that the wall of each of the first and second sub-segments each has at least one recess, for example, such that at least one (wall) opening in the wall of the holding frame is formed by at least one of the recesses. Alternatively or additionally, a central region of the holding frame can be formed by a third sub-segment that is integrally connected to the first and second sub-segments, for example, a tubular and/or monolithic.

According to a third embodiment of the fluid line system of the invention, it is further provided that the first fluid line and the holding frame are connected to one another in a materially bonded manner, for example by means of a welded connection and/or by means of a (hard) soldered connection.

According to a fourth embodiment of the fluid line system of the invention, it is further provided that the fourth fluid line and the holding frame are connected to each other in a materially bonded manner, for example by means of a welded connection and/or by means of a (hard) solder connection

According to a fifth embodiment of the fluid line system of the invention, it is further provided that the first fluid line and the holding frame are connected to one another in a force-fitting manner, for example by means of shrinking and/or stretching.

According to a sixth embodiment of the fluid line system of the invention, it is further provided that the fourth fluid line and the holding frame are connected to one another in a force-fitting manner, for example by means of shrinking and/or stretching.

According to a seventh embodiment of the fluid line system of the invention, it is further provided that the first fluid line and the holding frame are positively connected to one another, for example by means of one or more tongue and groove connections.

According to an eighth embodiment of the fluid line system of the invention, it is further provided that the fourth fluid line and the holding frame are positively connected to one another, for example by means of one or more tongue and groove connections. According to a ninth embodiment of the fluid line system of the invention, it is further provided that the first fluid line and the holding frame are connected to one another in a materially bonded manner by means of a welded connection produced in the region of the first end of the holding frame and the (corresponding) first line end of the first fluid line, for example a welded connection running all the way around (on the front side), for example in such a way that by means of the welded connection formed (between the first fluid line and the holding frame) a mechanical (compressive) stress is established in the first fluid line, which holds the outer cone of the wall of the first fluid line and the first inner cone of the wall of the holding frame pressed against one another (with formation of a force connection) and/or enforces a (holding) force acting (axially) in the direction of the first line end of the first fluid line or the first end of the holding frame, and/or (tensile) stress is established in the holding frame, which acts in the direction of the second line end of the first fluid line or the second end of the holding frame, for example in such a way that the (Holding) force is not less than 100 N and/or a joint pressure acting on the first fluid line and the first standing is more than 0.1 N/mm ² .

According to a tenth embodiment of the fluid line system of the invention, it is further provided that the fourth fluid line and the holding frame are connected to one another in a materially bonded manner by means of a welded connection produced in the region of the second end of the holding frame and the (corresponding) first line end of the fourth fluid line, for example, a welded connection running all the way around (on the front side), for example in such a way that by means of the welded connection formed (between the fourth fluid line and the holding frame), a mechanical (compressive) stress is established in the fourth fluid line, which holds the outer cone of the wall of the fourth fluid line and the second inner cone of the wall of the holding frame pressed against one another (forming a frictional connection) and/or enforces a (holding) force acting (axially) in the direction of the first line end of the fourth fluid line or the second end of the holding frame, and/or (tensile) stress is established in the holding frame, which acts in the direction of the second line end of the fourth fluid line or the first end of the holding frame, for example in such a way that the (Holding) force is not less than 100 N and/or a joint pressure acting on the fourth fluid line and the second standing is more than 0.1 N/mm ² .

According to an eleventh embodiment of the fluid line system of the invention, it is further provided that the outer cone of the first fluid line corresponds to a (straight) truncated cone.

According to a twelfth embodiment of the fluid line system of the invention, it is further provided that the outer cone of the fourth fluid line corresponds to a (straight) truncated cone. According to a thirteenth embodiment of the fluid line system of the invention, it is further provided that the first inner cone (of the holding frame) corresponds to a (straight) truncated cone.

According to a fourteenth embodiment of the fluid line system of the invention, it is further provided that the second inner cone (of the holding frame) corresponds to a (straight) truncated cone.

According to a fifteenth embodiment of the fluid line system of the invention, it is further provided that the outer cone of the first fluid line has a (cone) opening angle, for example corresponding to twice an arctangent of a conicity of the outer cone, which is not less than 5° and/or not greater than 30°, for example less than 20°.

According to a sixteenth embodiment of the fluid line system of the invention, it is further provided that the outer cone of the fourth fluid line has a (cone) opening angle, for example corresponding to twice an arctangent of a conicity of the outer cone, which is not less than 5° and/or not greater than 30°, for example less than 20°.

According to a seventeenth embodiment of the fluid line system of the invention, it is further provided that the first inner cone (of the holding frame) has a (cone) opening angle which is not less than 5° and/or not greater than 30°, for example less than 20°, and/or equal to a (cone) opening angle of the outer cone of the first fluid line.

According to an eighteenth embodiment of the fluid line system of the invention, it is further provided that the second inner cone (of the holding frame) has a (cone) opening angle which is not less than 5° and/or not greater than 30°, for example less than 20°, and/or equal to a (cone) opening angle of the outer cone of the fourth fluid line.

According to a nineteenth embodiment of the fluid line system of the invention, it is further provided that the outer cone of the first fluid line has a (cone) length, for example, more than 10 mm and/or less than 150 mm ^{2 ,} a smallest (cone) cross-section, for example, circular and/or more than 500 mm ² , and a largest (cone) cross-section, for example, circular and/or more than 600 mm ² , for example such that a conicity of the outer cone of the first fluid line is not less than 0.10 (1:10) and/or not greater than 0.50 (1:2). Further developing this embodiment of the invention, it is further provided that the conicity of the outer cone of the first fluid line is greater than 0.13 and less than 0.35. According to a twentieth embodiment of the fluid line system of the invention, it is further provided that the outer cone of the fourth fluid line has a (cone) length, for example, more than 10 mm and/or less than 150 mm ^{2 ,} a smallest (cone) cross-section, for example, circular and/or more than 500 mm ² , and a largest (cone) cross-section, for example, circular and/or more than 600 mm ² , for example such that a conicity of the outer cone of the fourth fluid line is not less than 0.10 (1:10) and/or not greater than 0.50 (1:2). Further developing this embodiment of the invention, it is further provided that the conicity of the outer cone of the fourth fluid line is greater than 0.13 and less than 0.35.

According to a twenty-first embodiment of the fluid line system of the invention, it is further provided that the wall of the holding frame consists of a (stainless) steel, for example a stainless steel, a duplex steel or a super duplex steel, for example a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. 1 .4301 , UNS S30400, UNS 31603, WNo. 1.0037, WNo. 1.0038, WNo. 1.0050, WNo. 1.0352, WNo. 1.0460 or WNo. 1.4116.

According to a twenty-second embodiment of the fluid line system of the invention, it is further provided that the wall of the holding frame consists of a different material than the wall of the first fluid line.

According to a twenty-third embodiment of the fluid line system of the invention, it is further provided that the wall of the holding frame consists of a different material than the wall of the fourth fluid line.

According to a twenty-fourth embodiment of the fluid line system of the invention, it is further provided that the wall of the first fluid line is made of the same material as the wall of the fourth fluid line.

According to a twenty-fifth embodiment of the fluid line system of the invention, it is further provided that the wall of the first fluid line consists of a (stainless) steel, for example a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, for example a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. (material number) 1.4404, WNo. 1 .4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602. According to a twenty-sixth embodiment of the fluid line system of the invention, it is further provided that the wall of the fourth fluid line consists of a (stainless) steel, for example a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, for example a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. (material number) 1.4404, WNo. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602.

According to a twenty-seventh embodiment of the fluid line system of the invention, it is further provided that the wall of the second fluid line consists of the same material as the wall of the third fluid line.

According to a twenty-eighth embodiment of the fluid line system of the invention, it is further provided that the wall of the second fluid line consists of a (stainless) steel, for example a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, for example a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. (material number) 1.4404, WNo. 1 .4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602.

According to a twenty-ninth embodiment of the fluid line system of the invention, it is further provided that the wall of the third fluid line consists of a (stainless) steel, for example a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, for example a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. (material number) 1.4404, WNo. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602.

According to a thirtieth embodiment of the fluid line system of the invention, it is further provided that the wall of the holding frame is made of a steel according to

AISI (American Iron and Steel Institute) 316L or WNo. 1.4301, and the wall of each of the first and fourth fluid lines is made of a steel according to

AISI (American Iron and Steel Institute) AISI 316L or WNo. 1.4410. According to a thirty-first embodiment of the fluid line system of the invention, it is further provided that the second and third fluid lines each have at least one (circular) arc-shaped, for example, central, sub-segment. Further developing this embodiment of the invention, it is further provided that the wall of the holding frame has a first (wall) opening and at least one second (wall) opening, wherein both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the first fluid line and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the first fluid line are guided through the first (wall) opening, and wherein both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the fourth fluid line and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the fourth fluid line are guided through the second (wall) opening.

According to a thirty-second embodiment of the fluid line system of the invention, it is further provided that the holding frame is a component of a protective housing of the fluid line system. Further developing this embodiment of the invention, it is further provided that a cavity of the protective housing is formed by the (frame) interior. Furthermore, a first housing end of the protective housing can be formed by the first fluid line, and a second housing end of the (converter) protective housing can be formed by the fourth fluid line, such that the protective housing has a side wall that at least partially laterally delimits the cavity and is laterally fixed to both the first fluid line, for example, namely its first line end, and the fourth fluid line, for example, namely its first line end, or is integrally connected thereto. The second and third fluid lines can be placed within the cavity of the protective housing such that each of the second and third fluid lines is spaced from the side wall of the protective housing.

According to a first embodiment of the measuring transducer of the invention, it is further provided that the second and third fluid lines are arranged to be flowed through by the measuring substance and to be vibrated during this process.

According to a first development of the measuring transducer of the invention, it further comprises: an electromechanical excitation arrangement which is designed to convert electrical power into mechanical power causing mechanical (useful) vibrations of the second and third fluid lines. According to a second development of the measuring transducer of the invention, it further comprises: a sensor arrangement which is designed to detect mechanical vibrations of the second and third fluid lines and to provide at least one vibration signal, for example electrical, representing vibrations of at least one of the second and third fluid lines, for example namely at least two vibration signals.

According to a first embodiment of the measuring device of the invention, it is further provided that the measuring device electronics are configured to feed an electrical drive signal into the measuring transducer. Further developing this embodiment of the invention, it is further provided that the measuring device electronics are electrically coupled to an electromechanical excitation arrangement of the measuring transducer, for example, in order to feed electrical power into the excitation arrangement by means of an electrical drive signal, wherein the excitation arrangement is configured to convert electrical power into mechanical power causing (useful) vibrations of the second and third fluid lines, and/or that the measuring device electronics are electrically coupled to a sensor arrangement of the measuring transducer, for example, in order to process at least one vibration signal provided by the sensor arrangement.

According to a second embodiment of the measuring device of the invention, the measuring transducer has an electromechanical excitation arrangement which is designed to convert electrical power fed in by the measuring device electronics, for example by means of an electrical driver signal, into mechanical power causing mechanical oscillations of at least the first fluid line, for example both the first fluid line and a second fluid line.

According to a third embodiment of the measuring device of the invention, the measuring transducer has a sensor arrangement which is designed to detect mechanical vibrations of the second and third fluid lines and to provide at least one vibration signal, for example electrical, representing vibrations of at least one of the second and third fluid lines, for example namely at least two vibration signals, and the measuring device electronics are electrically coupled to the sensor arrangement and designed to process the at least one vibration signal, for example namely to determine measured values for the at least one measured variable by means of the at least one vibration signal. A basic idea of the invention is to simplify the assembly of fluid line systems of the type in question and to improve the precision that can be achieved thereby by the contact surfaces of the fluid lines to be connected to the holding frame and the corresponding contact surfaces of the holding frame being conical (complementary to one another). One advantage of the fluid line system according to the invention is, in addition to the simple, yet precise assembly, that the fluid lines, which are typically made of high-priced materials, can be optimized in terms of their volume and material usage, namely they can be reduced compared to a circular cylindrical shape that equally meets all requirements. A further advantage is that the mechanical connection between the holding frame and the fluid lines is intrinsically more stable.

The invention and advantageous embodiments thereof are explained in more detail below with reference to exemplary embodiments illustrated in the figures of the drawing. Identical or similarly acting or functioning parts are provided with the same reference numerals in all figures; where clarity requires it or it otherwise seems expedient, previously mentioned reference numerals have been omitted in subsequent figures. Further advantageous embodiments or developments, for example, combinations of partial aspects of the invention initially explained only individually, will become apparent from the figures of the drawing and/or from the claims themselves.

In detail:

Fig. 1 shows a schematic sectional (side) view of an embodiment of a fluid line system according to the invention;

Fig. 2 schematically shows a fluid line system according to Fig. 1 in a partially sectioned perspective (exploded) view;

Fig. 3, 4 schematically show, in a sectional side view, details of a fluid line system according to Fig. 1 and 2 respectively;

Fig. 5 schematically shows a side view of a variant of a measuring transducer formed by means of a fluid line system according to Fig. 1 for a measuring device or a corresponding measuring device for measuring at least one physical measured variable of a fluid flowing in a pipeline; and Fig. 6 schematically shows in a side view a further variant of a measuring transducer formed by means of a fluid line system according to Fig. 1 for a measuring device or a corresponding measuring device for measuring at least one physical measured variable of a fluid flowing in a pipeline.

In Figs. 1, 2, 3 and 4, respectively, exemplary embodiments and details of a fluid line system serving to guide a fluid, for example a fluid measuring substance, and/or to form a measuring transducer or measuring device are shown schematically. The fluid line system can, as also schematically shown in Fig. 5 and 6, for example, be a component of a measuring transducer used to measure at least one measured variable of a fluid medium conveyed in a pipeline, in particular a gas, a liquid or a dispersion, for example a vibronic measuring transducer, for example according to one of the publications mentioned at the beginning US-A 57 96 011, US-A 2015/0082916, US-B 1 07 05 055, US-B 1 08 09 109, WO-A 2015/162617, WO-A 2017/048235, WO-A 2022/100836 or WO-A 2023/131475, or of a measuring device formed by means of such a measuring transducer, for example a A Coriolis mass flow meter, a density meter, or a viscosity meter. Alternatively or additionally, the fluid line system can also be part of a transfer point for custody transfer, such as a fuel dispensing station or a transfer point for a fluid medium. Accordingly, the at least one measured variable can be, for example, a density or viscosity of the fluid. However, the measured variable can also be, for example, a temperature or a flow parameter of the fluid or medium, such as a mass flow, a volume flow, or a flow velocity.

The fluid line system according to the invention comprises a first fluid line 100, for example designed as a line branch, with a first flow opening 100a, for example circular, surrounded by a wall, for example made of a metal, and extending from a first line end 100+ of the first fluid line 100, for example held by a connecting flange, both to a second flow opening 100b, for example circular, semicircular or oval, located in a second line end 100# of the same first fluid line 100 and to a second flow opening 100b, for example circular, semicircular or oval, spaced from the same second flow opening 100b in the second line end 100# of the same first

Fluid line 100, for example circular, semicircular or oval-shaped, third flow opening 100c extending lumen 100*, a second fluid line 200, for example designed as a rigid and/or at least partially circular-cylindrical tube, with a wall, for example made of a metal, encased in a wall, for example made of a metal, extending from a first flow opening 200a located in a first line end 200+ of the second fluid line, for example circular, semicircular or oval-shaped, to a second line end 200# of the same second fluid line 200, for example circular, semicircular or oval-shaped, second flow opening 200b extending lumen 200*, at least one third fluid line 300, for example designed as a rigid and/or at least partially circular-cylindrical tube and/or structurally identical to the second fluid line, with a lumen 300 which is surrounded by a wall, for example made of a metal, and extends from a first flow opening 300a located in a first line end 300+ of the third fluid line, for example circular, semicircular or oval-shaped, to a second flow opening 300b located in a second line end 300# of the same third fluid line 300, for example circular, semicircular or oval-shaped, and a fourth fluid line 400, for example identical to the first fluid line and/or serving as a line union, with a lumen 300 which is surrounded by a wall, for example made of a metal, and extends from a first flow opening 300a located in a first line end 300+ of the third fluid line, for example circular, semicircular or oval-shaped, to a second flow opening 300b located in a second line end 300# of the same third fluid line 300, for example circular, semicircular or oval-shaped, and a fourth fluid line 400 which is designed, for example, as the first fluid line and/or serving as a line union, with a lumen 300 which is surrounded by a wall, for example made of a metal, and extends from a a connecting flange, located in the first line end 400+ of the fourth fluid line 400, for example circular, first flow opening 400a, both up to a second flow opening 400b, located in a second line end 400# of the same fourth fluid line 400, for example circular, semicircular or oval-shaped, as well as up to a lumen 400* extending from the same second flow opening, located in the second line end 400# of the same fourth fluid line 400, for example circular, semicircular or oval-shaped. According to a further embodiment of the invention, the second and third fluid lines are each monolithic, namely formed in one piece, for example, namely a welded (metal) pipe having a single (longitudinal) weld seam or a (continuously cast or extruded) seamless (metal) pipe or are made from such a (metal) pipe.

As can also be seen from Fig. 1 or a synopsis of Figs. 1, 2 and 3, both the second fluid line 200 and the third fluid line 300 are connected with their respective first line end to the second line end 100# of the first fluid line 100 and with their respective second line end to the second line end 400# of the fourth fluid line 400; this in particular in such a way that both the lumen of the second fluid line 200 and the lumen of the third fluid line 300 communicate with the lumen of the first fluid line 100 and the lumen of the fourth fluid line 400 and/or in such a way that the first flow opening 200a of the second fluid line 200 opens into the second flow opening 100b of the first fluid line 100, the first flow opening 300a of the third fluid line 300 opens into the third flow opening 100c of the first fluid line 100, the second flow opening 200b of the second fluid line 200 opens into the second flow opening 400b of the fourth fluid line 400 and the second flow opening 300b of the third fluid line opens into the third flow opening 400c of the fourth fluid line 400. The fluid line system can then, for example, be integrated into the aforementioned pipeline in such a way that the fluid line 100, as also schematically shown in Fig. 1, is arranged on the inlet side with respect to a flow direction of the fluid allowed to flow through the fluid line system or a measuring transducer formed therewith, and the fluid line 400 is arranged on the outlet side with respect to the flow direction and/or that the fluid is allowed to flow in a predetermined flow direction through the pipeline and the fluid line system integrated into the same pipeline.

Each of the second and third fluid lines can be designed to be straight, in particular hollow-cylindrical, at least in sections, and/or, as also indicated in Fig. 2, curved, at least in sections, in particular V-shaped and/or U-shaped and/or circular-arc-shaped, for example also in such a way that each of the second and third fluid lines each has at least one (circular) arc-shaped, in particular central, sub-segment and straight sub-segments connecting said (circular) arc-shaped sub-segment to the first and fourth fluid lines, respectively.

Both the walls of the first and fourth fluid lines 100, 400 and the walls of the second and third fluid lines 200, 300 can each be made of metal, for example, at least partially, in particular entirely, from a stainless steel, such as a stainless steel, a (super) duplex steel, a nickel-molybdenum alloy, or a nickel-molybdenum-chromium alloy. Alternatively or additionally, the walls of the first and fourth fluid lines 100, 400 and/or the walls of the second and third fluid lines 200, 300 can each be made of the same material, for example, such that the walls of the first and fourth fluid lines 100, 400 are made of the same material as the walls of the second and third fluid lines 200, 300. According to a further embodiment of the invention, it is further provided that the wall of the second and third fluid lines 200, 300 is each made of a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNo. (material number) 1.4404, WNo. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750,

UNS 32760, WNo. 2.4617 or WNo. 2.4602. Alternatively or additionally, the wall of the first and fourth fluid lines 100, 400 can each be made of or consist of a steel according to AISI 304, AISI 304L, AISI 316L, WNo. 1.4404, WNo. 1.4435, UNS S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602.

The fluid line system according to the invention further comprises a (torsion- and bending-resistant) holding frame 1000, which is designed, for example, as a protective housing or serves as a component of a protective housing, with a (torsion- and bending-resistant) holding frame 1000, which is at least partially enclosed by a (metal) wall and extends from a first frame opening 1000a, for example circular, located in a frontal first frame end 1000+ of the holding frame to a first frame opening 1000a in a first frame end 1000+ in the longitudinal direction diametrically distant frontal second frame end 1000# of the same holding frame 1000, for example circular, extending (frame) interior. The holding frame 1000 of the fluid line system according to the invention is, for example, at least in sections, for example also predominantly, tubular, namely designed as a hollow body with a greater extension in a longitudinal direction compared to a largest caliber (inner diameter). The wall of the holding frame can advantageously be made of or consist of (stainless) steel, for example a stainless steel, a duplex steel or a super duplex steel. According to a further embodiment of the invention, the wall of the holding frame consists of a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNr. 1 .4301, UNS S30400, UNS 31603, WNo. 1 .0037, WNo. 1 .0038, WNo. 1 .0050, WNo. 1 .0352, WNo. 1 .0460 or WNo. 1 .4116. Advantageously, the wall of the holding frame can be made or consist, for example, of a steel according to AISI 316L or WNo. 1 .4301 and the wall of each of the first and fourth fluid lines can each be made or consist of a steel according to AISI AISI 316L or WNo. 1.4410.

Not least for the aforementioned case in which the second and third fluid lines 200, 300 are curved pipes, corresponding (wall) openings (1000c, 1000b) for passing the two fluid lines 200, 300 can be provided in the wall of the support frame 1000. Accordingly, according to a further embodiment of the invention, as also schematically illustrated in Fig. 5 or readily apparent from a synopsis of Figs. 5 and 2, the wall of the support frame 1000 has a first (wall) opening 1000c and at least one second (wall) opening 1000d. Furthermore, the second and third fluid lines are positioned in the holding frame such that both a (straight) sub-segment of the fluid line 200 connecting the aforementioned (circular) arc-shaped sub-segment of the fluid line 200 to the fluid line 100 and a (straight) sub-segment of the fluid line 300 connecting the aforementioned (circular) arc-shaped sub-segment of the fluid line 300 to the fluid line 100 are guided through the (wall) opening 1000c and that both a (straight) sub-segment of the fluid line 200 connecting the aforementioned (circular) arc-shaped sub-segment of the fluid line 200 to the fluid line 400 and a (straight) sub-segment of the fluid line 300 connecting the aforementioned (circular) arc-shaped sub-segment of the fluid line 400 are guided through the (wall) opening 1000d.

According to a further embodiment of the invention, the holding frame 1000 is formed by at least two, in particular identical and/or tubular and/or monolithic, (frame) sub-segments, for example such that the first frame end 1000+ is formed by a (tubular and/or monolithic) first sub-segment and the second frame end 1000# is formed by a (tubular and/or monolithic) second sub-segment. The two (frame) sub-segments can for example, be directly connected to one another in a materially bonded manner. Alternatively, the two (frame) sub-segments can also be connected to one another only indirectly, for example by forming a central region of the holding frame by means of a (tubular and/or monolithic) third sub-segment that is respectively materially bonded to the first and second sub-segments. Last but not least, for the aforementioned case in which 1000 (wall) openings are provided in the wall of the holding frame, the wall of each of the first and second sub-segments can each have at least one recess, for example in such a way that at least one (wall) opening in the wall of the holding frame is formed by means of at least one of the recesses.

A very simple, yet very precise assembly of the fluid line system can be achieved in the case of a holding frame that is to be assembled or composed of at least two sub-segments, for example by first connecting the second and third fluid lines to the first and fourth fluid lines (in a material-to-material manner), for example by means of a welded connection, or by producing an assembly comprising the first and fourth fluid lines and the second and third fluid lines connected thereto, and then connecting the first sub-segment (of the holding frame) to the first fluid line 100 (already connected to the second and third fluid lines) and the second sub-segment (of the holding frame) to the fourth fluid line 400 (already connected to the second and third fluid lines), for example in such a way that the first and second sub-segments are subsequently connected to one another by means of a welded connection (in a material-to-material manner). In the aforementioned case that the holding frame (final) further comprises a third sub-segment which connects the first and second sub-segments in a material-to-material manner, the third sub-segment can advantageously be connected (material-to-material) to the first and second sub-segments which have already been connected to the first and fourth fluid lines, respectively, for example by means of a welded connection.

As schematically illustrated in Fig. 5 and 6, the fluid line system can further comprise, not least when used in a measuring transducer or measuring device, a (shock- and/or pressure-resistant) protective housing for the fluid lines 300, 200. According to a further embodiment of the invention, the holding frame 1000 is designed as a component of the same protective housing; this is particularly the case in such a way that a cavity of the protective housing is formed by means of the (frame) interior, and that a first housing end 1000+ of the protective housing is formed by means of the first fluid line 100 and a second housing end 1000# of the transducer protective housing is formed by means of the fourth fluid line 400. The protective housing also has a side wall which at least partially delimits the cavity laterally, for example formed by the aforementioned sub-segments or their walls, which side wall (spaced from the second and third fluid lines) is fixed laterally both to the fluid line 100, for example namely its line end 100+, and to the fluid line 400, for example namely its line end 400+, or is connected thereto in a materially bonded manner, in particular in such a way that the first and fourth fluid lines 100, 400 each are an integral part of the protective housing and/or that the second and third fluid lines are placed within the cavity of the protective housing, although each of the second and third fluid lines is spaced from the side wall of the protective housing.

entsprechende Konizität K100 auf, die vorteilhaft nicht kleiner als 0,10 (1 :10) und/oder nicht größer als 0,50 (1 :2) ist, insb. nämlich größer als 0,13 und kleiner als 0,35 ist, und/oder weist, wie auch in Fig. 4 angedeutet, der Außenkonus der Fluidleitung 400, eine durch dessen vorbezeichnete (Konus-)Länge L400, dessen kleinsten (Konus-)Querschnitt A400+ sowie dessen größten (Konus-)Querschnitt A400# bestimmte bzw. einer Berechnungsvorschrift:

entsprechende Konizität K400 auf, die vorteilhaft nicht kleiner als 0,10 (1 :10) und/oder nicht größer als 0,50 (1 :2) ist, insb. nämlich größer als 0,13 und kleiner als 0,35 ist, und/oder die gleich der Konizität K100 ist. Nach einer weiteren Ausgestaltung der Erfindung weist, wie auch in Fig. 4 schematisch dargestellt, der Außenkonus der ersten Fluidleitung einen In order to enable a (highly) precise, yet simple installation and connection of the first and fourth fluid lines to the holding frame 1000 and/or to provide a (highly) strong (long-term) stable mechanical connection of the first and fourth fluid lines to the holding frame 1000, in the fluid line system according to the invention, as also shown schematically in Fig. 1, 2, 3 and 4 or as can be seen from their combination, the wall of the fluid line 100 on an outer side facing away from the lumen 100* forms an outer cone tapering in the direction of the line end 100+ and the wall of the fluid line 400 on an outer side facing away from the lumen 400* forms an outer cone tapering in the direction of the line end 400+. In addition, the wall of the holding frame forms, on an inner side facing the (frame) interior, a first inner cone (of the holding frame) in the area of the standing frame 1000+ which tapers towards the standing frame 1000+ and is complementary in particular to the outer cone of the fluid line 100, and a second inner cone (of the holding frame) in the area of the standing frame 1000# which tapers towards the standing frame 1000# and is complementary in particular to the outer cone of the fluid line 400, wherein the first and fourth fluid lines are each inserted into the holding frame in such a way that the outer cone of the fluid line 100 and the first inner cone (of the holding frame) are in surface contact with one another and that the outer cone of the fluid line 400 and the second inner cone (of the holding frame) are in surface contact with one another. Due to the aforementioned tapers, as also indicated in Fig. 3, the outer cone of the fluid line 100 has a smallest, in particular circular, (cone) cross-section A100+ and a largest, in particular circular, (cone) cross-section A100# and the outer cone of the fluid line 400 has a smallest, in particular circular, (cone) cross-section A100+ and a largest, in particular circular, (cone) cross-section A100#, wherein the smallest (cone) cross-sections of the first and fourth fluid lines are advantageously more than 500 mm ² and the largest (cone) cross-sections of the first and fourth fluid lines are advantageously more than 600 mm ² . In addition, the outer cone of the fluid line 100 has a (cone) length L100 and/or the outer cone of the fluid line 400 has a (cone) length L400, in particular the same as the (cone) length L100, wherein the (cone) lengths of the first and fourth fluid lines are advantageously more than 10 mm and/or less than 150 mm ² . The outer cone of the first and/or fourth fluid line as well as the first and/or second inner cones (of the holding frame) can also each correspond, for example, to a (straight) truncated cone. According to a further embodiment of the invention, as also indicated in Fig. 4, the outer cone of the fluid line 100 has a length L100, the smallest (cone) cross-section A100+ and the largest (cone) cross-section A100#, which is determined by a calculation rule:

corresponding conicity K100, which is advantageously not less than 0.10 (1:10) and/or not greater than 0.50 (1:2), in particular greater than 0.13 and less than 0.35, and/or, as also indicated in Fig. 4, the outer cone of the fluid line 400, a determined by its previously designated (cone) length L400, its smallest (cone) cross-section A400+ and its largest (cone) cross-section A400# or a calculation rule:

corresponding conicity K400, which is advantageously not less than 0.10 (1:10) and/or not greater than 0.50 (1:2), in particular greater than 0.13 and less than 0.35, and/or which is equal to the conicity K100. According to a further embodiment of the invention, as also schematically shown in Fig. 4, the outer cone of the first fluid line has a

während der (Konus-)Öffnungswinkel a.400 einem Zweifachen eines Arcustangens der vorbezeichneten Konizität K400 entspricht bzw. die Berechnungsvorschrift: a400 = 2 ■ arctan

erfüllt. Vorteilhaft weist zudem der erste Innenkonus (des Haltegestells) einen (Konus-)Öffnungswinkel a1000+ auf, der gleich groß wie ein (Konus-)Öffnungswinkel des Außenkonus der Fluidleitung 100 ist und/oder weist der zweite Innenkonus (des Haltegestells) einen (Konus-)Öffnungswinkel a.1000# auf, der gleich groß wie ein (Konus-)Öffnungswinkel des Außenkonus der Fluidleitung 400 ist. Entsprechend kann der (Konus-)Öffnungswinkel a1000+ und/oder der (Konus-)Öffnungswinkel oc1000# vorteilhaft nicht kleiner als 5° und/oder nicht größer als 30°, insb. kleiner als 20°, gewählt sein. (Cone) opening angle a.100 and/or the outer cone of the fluid line has a (cone) opening angle a.400, which is advantageously not less than 5° and/or not greater than 30°, in particular less than 20°. The (cone) opening angle a.100 corresponds to twice the arctangent of the previously specified conicity K100 or satisfies the calculation rule: al 00 = 2 ■ arctan

while the (cone) opening angle a.400 corresponds to twice an arctangent of the previously designated conicity K400 or the calculation rule: a400 = 2 ■ arctan

Advantageously, the first inner cone (of the support frame) also has a (cone) opening angle a1000+ that is equal to a (cone) opening angle of the outer cone of the fluid line 100 and/or the second inner cone (of the support frame) has a (cone) opening angle a.1000# that is equal to a (cone) opening angle of the outer cone of the fluid line 400. Accordingly, the (cone) opening angle a1000+ and/or the (cone) opening angle oc1000# should advantageously be selected to be not less than 5° and/or not greater than 30°, in particular less than 20°.

To create a permanent mechanical connection, a further embodiment of the invention provides that the fluid line 100 and the holding frame 1000 and/or the fluid line 400 and the holding frame 1000 are connected to one another in a force-fitting manner, for example by shrinking and/or stretching. Alternatively or additionally, the fluid line 100 and the holding frame 1000 and/or the fluid line 400 and the holding frame 1000 can be connected to one another in a material-fitting manner and/or, for example, by means of one or more tongue-and-groove connections, for example by means of a welded connection and/or by means of a (hard) solder connection. According to a further embodiment of the invention, the fluid line 100 and the holding frame 1000 are integrally connected to one another by means of a welded connection produced in the region of the frame end 1000+ and the corresponding line end 100+, in particular a welded connection running all the way around (on the front side) and/or the fluid line 400 and the holding frame 1000 are integrally connected to one another by means of a welded connection (S) produced in the region of the frame end 1000# and the corresponding line end 400+, in particular a welded connection running all the way around (on the front side); This is advantageous in such a way that, by means of the welded connection formed between the fluid line 100 and the holding frame 1000, additional mechanical (compressive) stresses are established in the fluid line 100 and/or in the direction of the line end 100# or the standing frame 1000, which hold the outer cone of the wall of the fluid line 100 and the first inner cone of the wall of the holding frame 1000 pressed against each other (forming a force connection) or enforce (holding) forces acting in the direction of the line end 100+ or the standing frame 1000+ and/or (tensile) stresses are established in the holding frame 1000 in the direction of the line end 100# or the standing frame 1000#, and/or that, by means of the welded connection formed between the fluid line 400 and the holding frame 1000, additional mechanical (compressive) stresses are established in the outer cone of the wall of the fluid line 400 and the second inner cone of the wall of the holding frame 1000 (forming a Force connection) against each other or in the direction of the line end 400+ or the supporting structure 1000# forcing (holding) forces acting in the direction of the line end 400+ or the supporting structure 1000+, mechanical (compressive) stresses are established in the fluid line 400 and/or (tensile) stresses acting in the direction of the line end 400# or the supporting structure 1000+ in the holding frame 1000. According to a further embodiment of the invention, it is further provided that the aforementioned (holding) force acting between the fluid line 100 and the holding frame 1000 is not less than 100 N and/or the aforementioned joint pressure (FP) acting on the fluid line 100 and the supporting structure 1000+ is more than 0.1 N/mm ² . Alternatively or additionally, the aforementioned (holding) force acting between the fluid line 400 and the holding frame 1000 can advantageously be not less than 100 N and/or the aforementioned joint pressure acting on the fluid line 400 and the supporting frame 1000# can advantageously be more than 0.1 N/mm ² . Not least for the aforementioned case in which the fluid line system is a component of a vibronic measuring transducer or a vibronic measuring device formed therewith, according to a further embodiment of the invention, the second and third fluid lines 200, 300 are additionally configured to have fluid flow through them and to be vibrated during this time; this can be done, for example, by having fluid flow through the two fluid lines 200, 300 simultaneously and vibrating simultaneously, in particular in opposite directions. Furthermore, according to a further embodiment of the invention, the fluid line system further comprises a sensor arrangement configured to detect oscillatory movements of the second and third fluid lines 200, 300 (dependent on or correlated with the at least one measured variable) and to provide at least one measurement signal s1, for example, an electrical and/or analogue signal, representing the oscillations of the second and third fluid lines 200, 300 and thus also the at least one measured variable. This is particularly achieved in such a way that the measurement signal s1 has at least one signal parameter that is dependent on the measured variable, namely, changes in the measured variable are followed by a corresponding change. A signal parameter that is dependent on the measured variable can, in turn, be, for example, a signal level that is dependent on the at least one measured variable, a signal frequency that is dependent on the same measured variable, and/or a phase angle of the measurement signal s1 that is dependent on the same measured variable. The sensor arrangement can be placed outside the fluid lines 300, 200, yet in their vicinity, for example, such that the sensor arrangement is attached to at least one of the fluid lines 300, 200. According to a further embodiment of the invention, the sensor arrangement is further configured to detect mechanical vibrations of at least one of the two aforementioned fluid lines 200, 300, for example, namely, bending vibrations of the fluid line 300 and/or the fluid line 200 at one or more resonant frequencies inherent in the fluid line system, and to provide at least one vibration signal representing vibrations of at least one of the fluid lines or serving as a measurement signal. For this purpose, the sensor arrangement can, for example, comprise a vibration sensor 51 (which differentially detects electrodynamic and/or vibrational movements of the two fluid lines 300, 200). According to a further embodiment of the invention, the fluid line system or the measuring transducer formed thereby additionally comprises an electromechanical excitation arrangement configured to convert electrical power into mechanical power causing vibrations of the fluid lines, for example, namely, the aforementioned bending vibrations of the fluid line 300 and/or the fluid line 200. The excitation arrangement can be controlled, for example, by means of at least one electrodynamic and/or differential excitation device on the two

Fluid lines 300, 200 acting vibration exciter 41. Not least for the mentioned case that the fluid line system is intended to measure a mass flow based on Coriolis forces generated in the flowing fluid, the sensor arrangement or the fluid line system formed thereby, as also indicated in Fig. 5 and 6, in addition to the vibration sensor 51, also at least one second vibration sensor 52 for Generate at least one second vibration measurement signal corresponding to the measured variable—in particular, electrical and/or analog—serving as the second measurement signal s2. Said vibration sensor 52 can be identical in construction to the vibration sensor 51 and/or positioned at the same distance as the vibration sensor 51 from the fluid line 300 or the fluid lines 300, 200. Alternatively or additionally, the vibration sensors 51, 52 can be positioned symmetrically with respect to the aforementioned vibration exciter 41. For the purpose of processing or evaluating the at least one measurement signal s1 or the measurement signals s1, s2, a measuring device formed by means of the aforementioned fluid line system can further comprise measuring device electronics electrically coupled to the sensor arrangement, for example formed by at least one microprocessor and/or a digital signal processor (DSP), which can advantageously be housed in an electronics housing that is sufficiently dust- and watertight or impact- and explosion-proof, for example also mounted on the holding frame or the protective housing formed thereby. In particular, such measuring device electronics can further be configured to process the at least one measurement signal s1 or the measurement signals s1, s2, for example to determine measured values for the at least one measured variable using the measurement signal s1 and/or the measurement signal s2. In the aforementioned case that the fluid line system is equipped with at least one vibration exciter 41, the measuring device electronics can also be electrically coupled to the aforementioned vibration exciter 41 and can also be configured to feed an electrical excitation signal e1 into the aforementioned vibration exciter 41, and the vibration exciter 41 can also be configured to convert electrical power fed in by means of the excitation signal e1 into mechanical power causing (useful) vibrations of both the fluid line 300 and the fluid line 200.

Claims

PATENT CLAIMS 1. A fluid line system comprising: - a first fluid line (100), in particular designed as a line branch, with a lumen (100*) surrounded by a wall, in particular made of a metal, and extending from a first flow opening (100a), in particular a circular one, located in a first line end (100+) of the first fluid line (100), in particular a connecting flange, both to a second flow opening (100b), in particular a circular, semicircular or oval-shaped one, located in a second line end (100#) of the same first fluid line (100), and to a third flow opening (100c), in particular a circular, semicircular or oval-shaped one, located in the second line end (100#) of the same first fluid line (100) at a distance from the second flow opening (100b); - a second fluid line (200), in particular designed as a rigid and/or at least partially circular-cylindrical tube and/or monolithic, with a lumen (200*) surrounded by a wall, in particular made of a metal, and extending from a first flow opening (200a), in particular a circular, semicircular or oval-shaped, located in a first line end (200+) of the second fluid line, to a second flow opening (200b), in particular a circular, semicircular or oval-shaped, located in a second line end (200#) of the same second fluid line (200); - at least one third fluid line (300), in particular designed as a rigid and/or at least partially circular-cylindrical tube and/or monolithic and/or structurally identical to the second fluid line, with a wall, in particular made of a metal, encased in a wall, in particular made of a metal, extending from a first flow opening (300a) located in a first line end (300+) of the third fluid line, in particular circular, semicircular or oval-shaped, to a second flow opening (300b) located in a second line end (300#) of the same third fluid line (300), in particular circular, semicircular or oval-shaped Lumens (300*); - a fourth fluid line (400), in particular identical in construction to the first fluid line and/or serving as a line connection, with a first flow opening (400a) surrounded by a wall, in particular made of a metal, extending from a first line end (400+) of the fourth fluid line (400), in particular a connecting flange, located, in particular, a first flow opening (400a), in particular a circular one, both to a second flow opening (400b) located in a second line end (400#) of the same fourth fluid line (400), in particular a circular, semicircular or oval-shaped one, as well as to a second flow opening (400b) spaced from the same second flow opening in the second lumen (400*) extending from the third flow opening (400c) located at the line end (400#) of the fourth fluid line (400), in particular circular, semicircular or oval-shaped; - and a holding frame (1000), in particular designed as a protective housing or as a component of a protective housing, at least partially, in particular predominantly, tubular, namely designed as a hollow body with a larger extension in a longitudinal direction compared to a largest caliber (inner diameter), with a wall, in particular made of a metal, at least partially enclosed by a wall, in particular having (wall) openings, and extending from a first frame opening (1000a), in particular a circular one, located in a (frontal) first frame end (1000+) of the holding frame to a second frame opening (1000b), in particular a circular one, located in a (frontal) second frame end (1000#) of the same holding frame (1000) which is longitudinally (diametrically) distant from the first frame end (1000+) (Frame) interior; - wherein both the second fluid line (200) with its first line end (200+) and the third fluid line (300) with its first line end (300+) are each connected to the second line end (100#) of the first fluid line (100), in particular in such a way that both the lumen of the second fluid line (200) and the lumen of the third fluid line (300) communicate with the lumen of the first fluid line (100) and/or in such a way that the first flow opening (200a) of the second fluid line (200) opens into the second flow opening (100b) of the first fluid line (100) and the first flow opening (300a) of the third fluid line (300) opens into the third flow opening (100c) of the first fluid line (100); - wherein both the second fluid line (200) with its second line end (200#) and the third fluid line (300) with its second line end (300#) are each connected to the second line end (400#) of the fourth fluid line (400), in particular in such a way that both the lumen (200*) of the second fluid line (200) and the lumen (300*) of the third fluid line (300) communicate with the lumen of the fourth fluid line (400) and/or in such a way that the second flow opening (200b) of the second fluid line (200) opens into the second flow opening (400b) of the fourth fluid line (400) and the second flow opening (300b) of the third fluid line opens into the third flow opening (400c) of the fourth fluid line (400); - wherein the wall of the first fluid line (100) forms, on an outer side facing away from its lumen, an outer cone which tapers towards the first line end (100+) of the same fluid line (100), in particular which is conical at least in sections; - wherein the wall of the fourth fluid line (400) forms, on an outer side facing away from its lumen, an outer cone which tapers towards the first line end (400+) of the same fluid line (400), in particular which is conical at least in sections; - wherein the wall of the support frame on an inner side facing the (frame) interior in the region of the first support (1000+) has a groove extending in the direction of the first A first inner cone (of the holding frame) which tapers towards the second standing frame (1000+), in particular which is conical in section at least, and in the region of the second standing frame (1000#) forms a second inner cone (of the holding frame) which tapers towards the second standing frame (1000#), in particular which is conical in section at least; - wherein the first fluid line is inserted into the holding frame in such a way that the outer cone (of the first fluid line) and the first inner cone (of the holding frame) contact each other in a planar manner, in particular forming a force-fitting and/or material-fitting and/or form-fitting connection between the first fluid line and the holding frame; - and wherein the fourth fluid line is inserted into the holding frame in such a way that the outer cone (of the fourth fluid line) and the second inner cone (of the holding frame) contact each other in a planar manner, in particular forming a force-fitting and/or material-fitting and/or form-fitting connection between the fourth fluid line and the holding frame. 2. Fluid line system according to one of the preceding claims, wherein the holding frame is formed by means of at least two materially connected, in particular tubular, (frame) sub-segments, in particular such that the first frame end (1000+) is formed by means of a first sub-segment (1000-1) and the second frame end (1000#) is formed by means of a second sub-segment (1000-2). 3. Fluid line system according to one of the preceding claims, wherein the first frame end (1000+) is formed by means of a, in particular tubular and/or monolithic, first sub-segment (1000-1) and the second frame end (1000#) is formed by means of a, in particular tubular and/or monolithic and/or structurally identical to the first sub-segment, second sub-segment (1000-2), in particular such that a central region of the holding frame is formed by means of a (tubular) third sub-segment (1000-3) which is integrally connected to the first and second sub-segments. 4. Fluid line system according to the preceding claim, - wherein the wall of each of the first and second sub-segments each has at least one recess, in particular such that at least one (wall) opening of the wall of the holding frame is formed by at least one of the recesses; and/or - wherein a central region of the holding frame is formed by means of a third sub-segment (1000-3) which is integrally connected to the first and second sub-segments, in particular a tubular and/or monolithic sub-segment. 5. Fluid line system according to one of the preceding claims, - wherein the first fluid line and the support frame are integrally connected to one another, in particular by means of a welded connection and/or by means of a (hard) solder connection; and/or - wherein the fourth fluid line and the support frame are integrally connected to one another, in particular by means of a welded connection and/or by means of a (hard) soldered connection; and/or - wherein the first fluid line and the holding frame are connected to each other in a force-locking manner, in particular by means of shrinking and/or stretching; and/or - wherein the fourth fluid line and the support frame are connected to each other in a force-locking manner, in particular by means of shrinking and/or stretching; and/or - wherein the first fluid line and the support frame are positively connected to one another, in particular by means of one or more tongue and groove connections; and/or - wherein the fourth fluid line and the holding frame are positively connected to one another, in particular by means of one or more tongue and groove connections. 6. Fluid line system according to one of the preceding claims, - wherein the first fluid line (100) and the holding frame (1000) are connected to one another in a materially bonded manner by means of a welded connection produced in the region of the first upright (1000+) of the holding frame (1000) and the (corresponding) first line end (100+) of the first fluid line, in particular a welded connection running all the way around (on the front side), in particular in such a way that by means of the welded connection formed (between the first fluid line and the holding frame) a mechanical (compressive) stress is generated in the first fluid line (100) and/or in the region of the first upright (1000+) of the holding frame and which holds the outer cone of the wall of the first fluid line (100) and the first inner cone of the wall of the holding frame pressed against one another (with formation of a frictional connection) and/or which forces a (holding) force acting (axially) in the direction of the first line end (100+) of the first fluid line or the first upright (1000+) of the holding frame Tensile stresses acting in the direction of the second line end (100#) of the first fluid line (100) or the second support (1000#) of the support frame are established in the support frame (1000), in particular such that the (holding) force is not less than 100 N and/or a joint pressure acting on the first fluid line and the first support (1000+) is more than 0.1 N/mm ² ; and/or - wherein the fourth fluid line (400) and the holding frame (1000) are connected to one another in a materially bonded manner by means of a welded connection produced in the region of the second upright (1000#) of the holding frame (1000) and the (corresponding) first line end (400+) of the fourth fluid line, in particular a welded connection running all the way around (on the front side), in particular in such a way that by means of the welded connection formed (between the fourth fluid line and the holding frame), a mechanical (compressive) stress is generated in the fourth fluid line (400) and/or in the region of the second upright (1000#) of the holding frame, which holds the outer cone of the wall of the fourth fluid line (400) and the second inner cone of the wall of the holding frame pressed against one another (forming a frictional connection) and/or forces a (holding) force acting (axially) in the direction of the first line end (400+) of the fourth fluid line or the second upright (1000#) of the holding frame. (Tensile) stresses acting in the direction of the second line end (400#) of the fourth fluid line (400) or the first support (1000+) of the support frame are established in the support frame (1000), in particular such that the (holding) force is not less than 100 N and/or a joint pressure acting on the fourth fluid line and the second support (1000+) is more than 0.1 N/mm ² . 7. Fluid line system according to one of the preceding claims, - wherein the outer cone of the first fluid line corresponds to a (straight) truncated cone; and/or - wherein the outer cone of the fourth fluid line corresponds to a (straight) truncated cone; and/or - wherein the first inner cone (of the support frame) corresponds to a (straight) truncated cone; and/or - whereby the second inner cone (of the holding frame) corresponds to a (straight) truncated cone. 8. Fluid line system according to one of the preceding claims, - wherein the outer cone of the first fluid line has a (cone) opening angle a.100 which is not less than 5° and/or not greater than 30°, in particular less than 20°; and/or - wherein the outer cone of the fourth fluid line has a (cone) opening angle a.400 which is not less than 5° and/or not greater than 30°, in particular less than 20°; and/or - wherein the first inner cone (of the support frame) has a (cone) opening angle a1000+ that is not less than 5° and/or not greater than 30°, in particular less than 20°, and/or equal to a (cone) opening angle of the outer cone of the first fluid line; and/or - wherein the second inner cone (of the holding frame) has a (cone) opening angle a.1000# which is not less than 5° and/or not greater than 30°, in particular less than 20°, and/or equal to a (cone) opening angle of the outer cone of the fourth fluid line. 9. Fluid line system according to one of the preceding claims, wherein the outer cone of the first fluid line (100) has a (cone) length L100, in particular more than 10 mm and/or less than 150 mm ² , a smallest (cone) cross-section A100+, in particular circular and/or more than 500 mm ² , and a largest (cone) cross-section A100#, in particular circular and/or more than 600 mm ² , in particular such that one of a calculation rule:

corresponding conicity K100 of the outer cone of the first fluid line (100) is not less than 0.10 (1:10) and/or not greater than 0.50 (1:2). 10. Fluid line system according to the preceding claim, wherein the outer cone of the first fluid line (100) has a calculation rule:

has a corresponding conicity K100 which is not less than 0.10 (1:10) and/or not greater than 0.50 (1:2), in particular greater than 0.13 and less than 0.35. 11. Fluid line system according to the preceding claim, wherein the outer cone of the first fluid line (100) has a (cone) opening angle a.100, which corresponds to twice an arctangent of the conicity K100 of the same outer cone or the calculation rule: al 00 = 2 ■ arctan

fulfilled. 12. Fluid line system according to one of the preceding claims, wherein the outer cone of the fourth fluid line (400) has a (cone) length L400, in particular more than 10 mm and/or less than 150 mm ² , a smallest (cone) cross-section A400+, in particular circular and/or more than 500 mm ² , and a largest (cone) cross-section A400#, in particular circular and/or more than 600 mm ² , in particular such that one of a calculation rule: 2 (A400# - VA400 +) K400 = - ■ - — - u L400 corresponding conicity K400 of the outer cone of the fourth fluid line (400) is not less than 0.10 (1 :10) and/or not greater than 0.50 (1 :2). 13. Fluid line system according to the preceding claim, wherein the outer cone of the fourth fluid line (400) has a calculation rule: 2 (A400# - VA100 +) K400 = - ■ - — - u L400 has a corresponding conicity K400 which is not less than 0.10 (1 :10) and/or not greater than 0.50 (1 :2), in particular greater than 0.13 and less than 0.35. 14. Fluid line system according to the preceding claim, wherein the outer cone of the fourth fluid line (400) has a (cone) opening angle a.400, which corresponds to twice an arctangent of the conicity K400 of the same outer cone or the calculation rule: a400 = 2 ■ arctan

fulfilled. 15. Fluid line system according to one of the preceding claims, - wherein the wall of the support frame is made of a (stainless) steel, in particular a stainless steel, a duplex steel or a super duplex steel, in particular a steel according to AISI (American Iran and Steel Institute) 304, AISI 304L, AISI 316L, WNo. 1.4301, UNS S30400, UNS 31603, WNo. 1.0037, WNo. 1.0038, WNo. 1.0050, WNo. 1.0352, WNo. 1.0460 or WNo. 1.4116; and/or - wherein the wall of the support frame is made of a different material than the wall of the first fluid line (100); and/or - wherein the wall of the support frame is made of a different material than the wall of the fourth fluid line (400); and/or - wherein the wall of the first fluid line (100) consists of the same material as the wall of the fourth fluid line (400); and/or - wherein the wall of the first fluid line consists of a (stainless) steel, in particular a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, in particular a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNr. (Material number) 1.4404, WNr. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602; and/or - wherein the wall of the fourth fluid line consists of a (stainless) steel, in particular a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, in particular a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNr. (Material number) 1.4404, WNr. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602; and/or - wherein the wall of the second fluid line (200) consists of the same material as the wall of the third fluid line (300); and/or - wherein the wall of the second fluid line consists of a (stainless) steel, in particular a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, in particular a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNr. (Material number) 1.4404, WNr. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNo. 1.4410, WNo. 1.4501, UNS 32750, UNS 32760, WNo. 2.4617 or WNo. 2.4602; and/or - wherein the wall of the third fluid line consists of a (stainless) steel, in particular a stainless steel, a duplex steel, a super duplex steel, a nickel-molybdenum alloy or a nickel-molybdenum-chromium alloy, in particular a steel according to AISI (American Iron and Steel Institute) 304, AISI 304L, AISI 316L, WNr. (Material number) 1.4404, WNr. 1.4435, UNS (Unified Numbering System for Metals and Alloys) S31603, S32750, WNr. 1.4410, WNr. 1.4501, UNS 32750, UNS 32760, WNr. 2.4617 or WNr. 2.4602. 16. Fluid line system according to one of the preceding claims, - the wall of the support frame being made of a steel according to AISI (American Iron and Steel Institute) 316L or WNo. 1.4301, - and wherein the wall of each of the first and fourth fluid lines is made of a steel according to AISI (American Iron and Steel Institute) AISI 316L or WNo. 1.4410. 17. Fluid line system according to one of the preceding claims, wherein the second and third fluid lines each have at least one (circular) arc-shaped, in particular central, sub-segment. 18. Fluid line system according to the preceding claim, - wherein the wall of the holding frame has a first (wall) opening and at least one second (wall) opening; - wherein both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the first fluid line and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the first fluid line are guided through the first (wall) opening; - and wherein both a sub-segment of the second fluid line connecting the (circular) arc-shaped sub-segment of the second fluid line to the fourth fluid line and a sub-segment of the third fluid line connecting the (circular) arc-shaped sub-segment of the third fluid line to the fourth fluid line are guided through the second (wall) opening. 19. Fluid line system according to one of the preceding claims, wherein the holding frame (1000) is part of a protective housing of the fluid line system. 20. Fluid line system according to the preceding claim, wherein a cavity of the protective housing is formed by means of the (frame) interior. 21 . Fluid line system according to the preceding claim, - wherein a first housing end (1000+) of the protective housing (1000) is formed by means of the first fluid line (100) and a second housing end (1000#) of the (converter) protective housing (1000) is formed by means of the fourth fluid line (400), such that the protective housing (1000) has a side wall which at least partially laterally delimits the cavity and which is laterally fixed to both the first fluid line (100), in particular its first line end (100+), and the fourth fluid line (400), in particular its first line end (400+), or is integrally connected thereto, - and wherein the second and third fluid lines are placed within the cavity of the protective housing such that each of the second and third fluid lines is spaced from the side wall of the protective housing (1000). 22. A measuring transducer, in particular a vibronic measuring transducer, for detecting at least one measured variable of a flowing medium and for generating at least one measuring signal (s1, s2) corresponding to the at least one measured variable, which measuring transducer comprises: a fluid line system according to one of the preceding claims. 23. A measuring transducer according to any one of the preceding claims, wherein the second and third fluid lines (200, 300) are arranged to be flowed through by the measuring substance and to be vibrated during this flow. 24. A measuring transducer according to any one of the preceding claims, further comprising: an electromechanical excitation arrangement configured to convert electrical power into mechanical power causing (useful) vibrations of the second and third fluid lines. 25. A measuring transducer according to any one of the preceding claims, further comprising: a sensor arrangement configured to detect mechanical vibrations of the second and third fluid lines and to provide at least one vibration signal, in particular electrical, representing vibrations of at least one of the second and third fluid lines, in particular at least two vibration signals. 26. Measuring instrument, comprising: - a transducer according to one of the preceding claims, - and a measuring device electronics electrically connected to the measuring transducer and used to process the at least one measuring signal (s1, s2). 27. A measuring device according to any one of the preceding claims, wherein the measuring device electronics are arranged to feed an electrical drive signal into the measuring transducer. 28. Measuring device according to the preceding claim, comprising a transducer according to claim 12, - wherein the measuring device electronics (20) is electrically coupled to the excitation arrangement, in particular in order to feed electrical power into the excitation arrangement by means of an electrical drive signal; and/or - wherein the excitation arrangement is configured to convert electrical power supplied by the measuring device electronics, in particular by means of an electrical driver signal (e1), into mechanical power causing mechanical vibrations of at least the second fluid line, in particular both the second fluid line and a third fluid line. 29. Measuring device according to one of the preceding claims, comprising a measuring transducer according to Claim 13, wherein the measuring device electronics (20) are electrically coupled to the sensor arrangement and is configured to process the at least one vibration signal, in particular to determine measured values for the at least one measured variable by means of the at least one vibration signal. 30. Using a measuring device according to any one of the preceding claims for determining Measured values for at least one measured variable - in particular a mass flow rate, a mass flow, a volume flow rate, a volume flow, a density, a viscosity or a temperature - of a fluid medium conveyed in a pipeline, in particular a gas, a liquid or a dispersion, in particular in such a way that the first fluid line is arranged on the inlet side with respect to a flow direction of the medium allowed to flow through the measuring transducer and/or that the medium is allowed to flow in a predetermined flow direction through the pipeline and the measuring transducer integrated in the same pipeline.