Connecting sleeves for pipeline systems used to guide fluids

Abstract

The present invention relates to a connecting sleeve (1) for guiding fluid in a pipeline system, the connecting sleeve having a fluid channel (2) extending along a fluid channel axis (X), wherein the fluid channel (2) can be connected to the pipeline channel of the pipeline system at at least a first connecting end (4) and a second connecting end (6) of the connecting sleeve (1). A measuring section (10) is formed between the first connecting end (4) and the second connecting end (6), wherein a sensor system for measuring the pressure of a medium flowing in the fluid channel (2) is arranged. The sensor system has a connection interface by which it can be connected to a control unit for measuring the pressure in the fluid channel (2), and for measuring the pressure, at least two strain gauge sensors are provided, which are offset on the outer wall (14) of the measuring section (10) around the periphery of the fluid channel axis (X). The present invention also relates to a control unit for connecting to a sensor system for measuring the fluid pressure of the connecting sleeve (1), the control unit having a connection means for data connection with the sensor system of the connecting sleeve (1) and a calculation means for calculating the fluid pressure in the connecting sleeve (1) based on received data and based on line and / or medium-specific parameters stored in the control unit.

Description

Technical Field

[0001] This invention relates to a connecting sleeve for guiding fluid in a pipeline system. The connecting sleeve has a fluid channel extending along the axis of a fluid passage, wherein the fluid channel is connectable to the pipeline channel of the pipeline system at least at a first connecting end and a second connecting end of the connecting sleeve. A measurement section is formed between the first and second connecting ends, wherein a sensor system for measuring the pressure of a medium flowing in the fluid channel is arranged. The sensor system has a connection interface through which it can be connected to a control unit for measuring the pressure in the fluid channel. Furthermore, the invention includes a control unit for connecting to the sensor system for pressure measurement of the fluid pressure in the connecting sleeve. Background Technology

[0002] In pipeline systems that guide fluids, especially hydraulic systems, the maximum pressure can reach as high as 3200 bar, but it can also exceed 3200 bar. Conventional pressure sensors for hydraulic systems are screwed into the hydraulic block at a T-connection sleeve or a specially designed hole. This requires significant construction costs and a large space. The sensor itself typically uses a diaphragm made of a sensitive material that comes into contact with the medium located in the fluid channel. Due to the sensitive diaphragm, media compatibility is limited to such a extent that the entire pipeline system is only suitable for a specific medium, or the pipeline system only allows pressure monitoring for selected media. In particular, hydrogen is a highly corrosive medium. Therefore, for example, pipeline systems transporting hydrogen have a known shortened sensor lifespan.

[0003] Another drawback is the impact on flow rate through the T-junction branch. On one hand, turbulence (leading to flow losses) and cavitation occur at the branch point. In cavitation, air segregation occurs due to shearing motion in the medium. Air segregation results in temperature-dependent combustion, which, according to the diesel effect, leads to aging of the medium, particularly the oil, and the collection of deposits or combustion residues. Therefore, cavitation and the diesel effect mean that the pipeline system requires more frequent maintenance and has a shorter service life. Summary of the Invention

[0004] The purpose of this invention is to provide a connecting sleeve that solves the problems known in the prior art, particularly optimizing service life and maintenance intervals and preferably optimizing media-related availability, thereby advantageously reducing flow losses.

[0005] According to the present invention, this objective is achieved by the feature of the connecting sleeve according to claim 1, wherein the sensor system for measuring pressure has at least two strain gauge sensors that are staggered on the outer wall of the measuring section around the periphery of the fluid channel axis.

[0006] High pressure within a pipeline system causes related components, particularly connecting sleeves, to slightly expand their elastic range. The material of the connecting sleeves stretches accordingly in various directions under pressure. This invisible stretching is recorded by strain gauge sensors arranged on the connecting sleeves and output as a physical change, particularly as a change in resistance or voltage, or forwarded to the control unit via the connection interface. This invention is based on the discovery that pressure in a pipeline system can be inferred by measuring and elucidating the strain or length changes occurring at the connecting sleeves. The change in the length of the connecting sleeve is directly related to the pressure recorded in the pipeline system, thus ensuring that the strain gauges used as pressure sensors do not come into contact with the medium flowing through the pipeline system.

[0007] The connecting sleeve according to the invention also enables a measurement method that can be easily and space-savingly retrofitted into existing pipeline systems and is applicable to virtually any medium, provided that the connecting sleeve itself, i.e., its material, is suitable for that medium. This means that the sensor system can also be used for corrosive media, such as hydrogen, for which suitable sensors are currently difficult to find or are very expensive.

[0008] Preferably, strain gauge sensors are arranged at 90° or 180° intervals around the fluid channel axis on the periphery. Specifically, the strain gauge sensors are arranged staggered from each other along the fluid channel axis. Thus, external influences, such as strain or stress on the pipeline system caused by external forces, can be compensated for through the arrangement and interconnection of the strain gauge sensors. It is advantageous to distinguish between externally induced strain and internally induced strain, which allows for conclusions regarding the pressure in the pipeline system.

[0009] Of particular advantage is that the strain gauge sensor is designed as a strain gauge with at least one strain measurement sensor.

[0010] Advantageously, each strain gauge has a strain measuring sensor on a carrier membrane. Preferably, each strain gauge has two strain measuring sensors on the carrier membrane, wherein the first strain measuring sensor measures the longitudinal strain in the longitudinal direction, and the second strain measuring sensor measures the transverse strain in the transverse direction. Advantageously, the two strain measuring sensors on the respective carrier foils are rotated 90° relative to each other and arranged sequentially in the longitudinal direction relative to the axis of the fluid channel.

[0011] In an advantageous embodiment of the invention, the strain gauges in the sensor system are electrically connected to form a full Wheatstone bridge. This special circuit arrangement offers the advantage of compensating for temperature and vibration. In particular, the connecting sleeve has four active strain gauges.

[0012] Advantageously, at least one strain measurement sensor is electrically connected in the sensor system for resistance lookup. This circuit is preferably arranged in parallel with the circuit for measuring pressure or strain. Advantageously, multiple strain measurement sensors can also be individually switched in a switching arrangement for resistance lookup to improve measurement quality. The parallel extension of resistance lookup by the individual strain measurement sensors can yield conclusions about vibration. The resulting advantage is that the sensor system can perform vibration detection simultaneously with pressure measurement.

[0013] Advantageously, a receiving slot extending circumferentially, particularly fully circumferentially, around the outer wall of the measuring section is designed within the measuring section. This receiving slot is used to integrate the electronic circuitry of the sensor system and / or strain gauge sensor. The receiving slot improves protection and reduces the installation space required for the sensor system.

[0014] Preferably, strain gauge sensors are arranged in measuring grooves formed in the outer wall of the measuring section and extending parallel to the fluid channel axis. In another embodiment, the measuring grooves extend along the fluid channel axis over the entire axial extension of the measuring section. By introducing two measuring grooves, it is also advantageous to record a higher degree of strain in the measuring section.

[0015] Regarding the application of the connecting sleeve, external influences, and consequent service life, according to a preferred embodiment, the connecting sleeve has a coating, particularly an anti-corrosion coating, on at least its outer surface facing away from the fluid conduit. An advantage of combining it with a strain gauge is that the strain gauge is advantageously arranged on the coating, especially the anti-corrosion coating. Advantageously, the anti-corrosion coating is designed in the form of a zinc-nickel layer. In particular, the advantage of arranging the strain gauge on the coating is that the manufacturing and coating of the connecting sleeve can be easier, and the sensor system is not damaged during the coating process.

[0016] Of particular advantage, the sensor system's connection interface is designed as an inductive connection interface. Specifically, this interface allows the transmission of a power supply voltage to the sensor system or strain gauge. In this case, the induced power supply voltage can be transmitted via a clamp, which holds the connecting sleeve, particularly in a force-form fit manner.

[0017] Preferably, the connection interface of the sensor system is designed as a cableless or wireless connection interface, through which data can be transmitted from and / or to the sensor system. For example, the wireless or cableless connection interface is designed as an inductive, radio, Bluetooth, or WiFi connection interface.

[0018] Advantageously, the inductive connection interface is disposed in the receiving slot. In an advantageous embodiment, data can be transmitted from and / or to the sensor system via the connection interface. Particularly advantageously, both voltage input and measurement signal output are performed through the same connection interface.

[0019] To connect the sensor system to the control unit via inductive transmission, the clip is preferably connected to the control unit via a cable. The clip surrounds the receiving slot and the sensor system or its connection interface disposed therein. The clip can be designed to be manually fitted onto the connection interface, particularly the receiving slot, by an assembler. Preferably, the clip is widened in a resilient region by hand or with tools, and then clamped, locked, or secured to the connecting sleeve by means of elastic rebound. Alternatively, the clip can be plastically deformed, especially under the influence of temperature, and pressed or shaped onto the connecting sleeve by hand and / or with tools.

[0020] According to an alternative embodiment, the voltage source is located on the connecting sleeve itself. The power supply voltage can be applied to the sensor system via the voltage source. Advantageously, the voltage source is a battery, particularly arranged in the receiving slot. This voltage source eliminates the need for an external voltage supply. This improvement is particularly advantageous in remote or hard-to-reach locations.

[0021] The preferred embodiment has proven particularly advantageous for challenging usage locations. According to this embodiment, the sensor system's connection interface is designed as a transmitter element and / or receiver element for generating or receiving radio, Bluetooth, or WiFi signals. Specifically, the control unit has a transmitter element or receiver element designed or configured corresponding to the aforementioned transmitter or receiver element. In particular, no wired connection is required between the sensor system and the control unit, which expands the versatility of the connection sleeve's application locations and the control unit's retrieval locations. Furthermore, by laying separate wiring, the risk of accidents and assembly costs are reduced.

[0022] In particular, in advantageous applications, the control unit is designed as a mobile device that receives measurement signals directly or indirectly from the connection interface of the connecting sleeve using a receiver element. Mobile devices include mobile phones, tablets, laptops, etc. Direct connections are particularly common, for example, via Bluetooth, where the control unit and sensor system communicate directly with each other. Indirect connections are particularly common, where a device, such as a network device, is connected to make the measurement signals available to the network, for example, via a WiFi-based connection. Specifically, indirect connections enable both protected, network-restricted access to the measurement signals and remote access to the measurement signals via the internet.

[0023] Furthermore, the objective of the present invention is achieved by a control unit according to claim 22, which is connected to the aforementioned sensor system for measuring the fluid pressure of the connecting sleeve.

[0024] According to the present invention, the control unit has a connection device for data technology connection with a sensor system of a connecting sleeve and a calculation device for calculating the fluid pressure in the connecting sleeve based on received data and based on line and / or medium-specific parameters stored in the control unit.

[0025] Particularly advantageously, in addition to pure pressure measurement and optional vibration measurement, the invention is preferably capable of determining the temperature of the medium located in the fluid channel. Advantageously, the computing device of the control unit is designed to calculate the temperature of the medium located in the fluid channel based on the measurement data and parameters. Advantageously, the reference point of the initial position is determined by at least the known temperature of the medium and the known strain in the measurement section, thereby allowing conclusions about the medium temperature to be drawn from the relative strain and including pipeline and / or specific medium parameters. Attached Figure Description

[0026] Further advantageous designs of the invention are derived from the following description of the accompanying drawings and dependent claims.

[0027] In the attached image:

[0028] Figure 1 A perspective view of a first embodiment of the connecting sleeve is shown.

[0029] Figure 2 It shows that according to Figure 1 The connecting sleeve is according to Figure 1 A top view along the axial direction of the fluid axis.

[0030] Figure 3 A schematic diagram of a carrier membrane with two strain gauges is shown.

[0031] Figure 4 It shows the following according to Figure 1The longitudinal section of the fluid axis X,

[0032] Figure 5 A perspective view of a second embodiment of a connecting sleeve having a cast (vergossen) measuring groove and a receiving groove is shown.

[0033] Figure 6 A perspective view of a third embodiment of a connecting sleeve having partially cast measuring and receiving grooves is shown.

[0034] Figure 7 and Figure 8 It shows that according to Figure 6 A perspective view of the connection sequence of the third embodiment of the connecting sleeve having a control unit.

[0035] Figure 9 A perspective view of a fourth embodiment of a connecting sleeve with a receiving slot is shown.

[0036] Figure 10 A perspective view of a fifth embodiment of a connecting sleeve having a partially cast receiving groove is shown.

[0037] In all the figures in the accompanying drawings, the same parts are always given the same reference numerals. Detailed Implementation

[0038] It is to be claimed in the following description that the invention is not limited to the embodiments and is not limited to all or some of the features described herein. Rather, each individual partial feature of each embodiment may also be separated from all other partial features described therewith, and its combination with any feature of another embodiment is also of great importance to the subject matter of the invention.

[0039] exist Figure 1 , 5 Figures 6, 9, and 10 show a connecting sleeve 1 for guiding fluid in a pipeline system. This connecting sleeve 1 has a fluid passage 2 extending along the fluid axis X, wherein the fluid passage 2 can be connected to the pipeline passage of the pipeline system at at least a first connecting end 4 and a second connecting end 6 of the connecting sleeve 1. The pipeline passage of the pipeline system is not shown in the figures.

[0040] The connecting ends 4 and 6 of the connecting sleeve 1 can be designed to allow the connecting sleeve 1 to be connected to a pipe or unit. Specifically, at least one connecting end 4 or 6 has an external thread 8 pointing outward from the fluid passage 2 for mounting a pipe or screwing into a unit. Alternatively, at least one connecting end 4 or 6 has an internal thread pointing towards the fluid passage 2 for screwing into an adapter element of the unit or a pipe. At least one connecting end 4 or 6 is advantageously designed as a spindle and / or sleeve and / or plug. At least one connecting end 4 or 6 is advantageously connected to the unit or pipe by a material fit, particularly by welding, brazing, or gluing. According to a particularly preferred embodiment, external threads 8 are formed on both connecting ends 4 or 6 for screwing onto a pipe or unit, such as... Figure 1 and Figures 5 to 10 As shown schematically.

[0041] like Figure 1 As shown, a measurement section 10 is formed between the first connecting end 4 and the second connecting end 6. A sensor system for measuring the pressure of the medium flowing in the fluid channel is arranged in this measurement section 10. The sensor system has a connection interface through which it can be connected to a control unit for measuring the pressure in the fluid channel 2. For simplicity, the connection interface and the control unit are not shown in the diagram. Figure 1 As shown in the image.

[0042] According to the present invention, a sensor system for pressure measurement has at least two strain gauge sensors. For example... Figure 2 As shown, the strain gauge sensors are arranged staggered around the fluid channel axis X on the outer wall 14 of the measurement section 10.

[0043] Figure 2 The connecting sleeve 1 shown corresponds to a preferred embodiment, in which the strain gauge sensor is arranged peripherally offset by 180° around the fluid channel axis X. According to another embodiment (not shown), the strain gauge sensor is arranged peripherally offset by 90° around the fluid channel axis X.

[0044] Particularly preferred, according to Figure 4 In the embodiment shown, the strain gauge sensors are arranged offset from each other along the fluid channel axis X.

[0045] The strain gauge sensor records the strain in the measurement section 10, especially the strain invisible to the human eye, and outputs these as measurement signals, particularly in the form of resistance changes or voltage changes.

[0046] By measuring the strain or length change generated at the connecting sleeve 1 and interpreting the measurement signal, particularly with the aid of a control unit, the pressure in the pipeline system can be determined. The length change of the connecting sleeve 1 is directly related to the pressure recorded in the pipeline system. According to... Figure 1 The arrangement of the strain gauges 12, used as sensors for pressure measurement, ensures that the strain gauge sensors do not come into contact with the medium guided in the pipeline system. In particular, this makes the connecting sleeve 1 according to the invention suitable for almost any medium in the pipeline system, with the only requirement being that the connecting sleeve 1 itself, i.e., its material, is suitable for that medium. This means that the sensor system can also be used for corrosive media, such as hydrogen, for which only a few or more expensive suitable pressure sensors exist.

[0047] like Figure 1 , 5 As shown in 6, 9 and 10, the sensor system with the connecting sleeve 1 according to the invention saves space and can be easily retrofitted into existing pipeline systems.

[0048] In particular, such as Figure 2 and 4 As shown, the arrangement of the strain gauge sensors on the connecting sleeve 1, offset by 180° around the fluid channel axis X, allows externally applied influences, such as strain or tension caused by assembly forces, to be compensated for through the arrangement and interconnection of the strain gauge sensors. Advantageously, externally induced strain and internally induced strain can be distinguished, thus allowing conclusions to be drawn regarding the pressure in the pipeline system.

[0049] The strain gauge sensor is particularly advantageously designed as strain gauge 12, such as Figure 1 and Figure 3 As illustrated, each strain gauge has at least one strain measurement sensor 13.

[0050] In particular, such as Figure 1 As shown, strain gauge 12 extends along the fluid channel axis X in its longitudinal direction.

[0051] Advantageously, at least one strain measurement sensor 13 is arranged on the carrier membrane 16. For example... Figure 1 and Figure 3 As shown, the strain gauge 12 preferably has two strain measurement sensors 13 on the carrier membrane 16. Specifically, the first strain measurement sensor 13 measures the strain in the longitudinal direction, and the second strain measurement sensor 13 measures the strain in the transverse direction. The carrier membrane 16 is particularly preferably connected to the connecting sleeve 1 in a material that mates with it. Figure 1 and Figure 3 As shown, the strain measurement sensor 13 is advantageously connected to the carrier membrane 16 in a material-fit manner.

[0052] Figure 1 The connecting sleeve 1 shown corresponds to a preferred embodiment having two strain gauges 12 and four strain measurement sensors 13, wherein every two strain measurement sensors 13 are arranged adjacent to each other on a common carrier membrane 16, as shown. Figure 3 As shown.

[0053] In an advantageous embodiment of the invention, the strain measurement sensors 13 in the sensor system are electrically connected to form a full Wheatstone bridge. Since the full Wheatstone bridge circuit itself is known, it is not shown in the figures for better overview. Specifically, the connecting sleeve 1 here has four active strain measurement sensors 13, preferably two strain measurement sensors 13 on each carrier membrane 16, wherein one strain measurement sensor 13 on each carrier membrane 16 measures the longitudinal strain along the fluid channel axis X, and a strain gauge 12 measures the transverse or circumferential strain of the connecting sleeve 1. For example, the connecting sleeve 1… Figure 1 The illustrated embodiment has at least one such strain gauge 12. An embodiment of the strain gauge 12 having a carrier membrane 16 and two strain measurement sensors 13 is... Figure 3 This is illustrated schematically. Advantageously, as shown below... Figure 3 As shown, two strain measurement sensors 13 on the carrier membrane 16 are rotated 90° relative to each other and arranged one after the other in the longitudinal direction relative to the fluid channel axis X.

[0054] Interconnection with a full Wheatstone bridge advantageously allows for compensation of the effects of bending, vibration, and temperature in the measurement, and normal strain, i.e., the axial strain relative to the fluid channel axis X, can be measured independently of bending strain. Another advantage is that interconnection with a full Wheatstone bridge results in a high output signal or measurement signal and excellent common-mode rejection (CMR).

[0055] Advantageously, at least one individual strain gauge 13 is electrically connected in the sensor system for resistance lookup. A diagram illustrating the circuit arrangement for resistance lookup of each strain gauge 12, corresponding to a full Wheatstone bridge circuit, is omitted. This circuit is preferably connected in parallel with the pressure or strain measurement circuit, particularly with the full Wheatstone bridge circuit. Advantageously, multiple strain gauges 13 can also be individually connected in the sensor system for resistance lookup, in order to improve measurement quality by means of data comparison, such as forming an average value. Parallel resistance lookup of each strain gauge 13 enables the measurement of vibrations within the connecting sleeve 1.

[0056] In particular, strain gauge 12 is a highly sensitive strain gauge 12, which can advantageously transmit strain at a rate of at least 10 -4 The precision is output to the control unit at a rate of mm.

[0057] According to one embodiment, strain gauge 12 is designed as a membrane strain gauge. In this case, a piezoresistive strain gauge, typically a resistance wire, is preferably applied to the carrier membrane 16. The membrane is advantageously used as a device that can be assembled, and in particular glued, onto the connecting sleeve 1.

[0058] According to another embodiment, strain gauge 12 is designed as a silicon strain gauge. Advantageously, silicon strain gauges offer very high sensitivity while maintaining a small size. The silicon strain gauge is preferably mounted to the connecting sleeve 1 by bonding or glass welding. Advantageously, alternative, potentially more cost-effective mounting methods are obtained by selecting vitrification.

[0059] Advantageously, the strain gauge 12, particularly the silicon strain gauge 12, is assembled onto the connecting sleeve 1 by a combination of adhesive bonding and glass welding methods. Preferably, the silicon strain gauge 12 is first vitrified onto the carrier membrane 16. Then, the carrier membrane 16 is glued to the connecting sleeve 1. This combination of material-fitted connections has the advantage that, by increasing the surface area created by the carrier membrane 16, creep effects can be reduced compared to direct gluing of the silicon strain gauge. Simultaneously, simple assembly onto the connecting sleeve 1 can be performed by gluing. This simplifies the complex process of direct vitrification. When directly vitrified onto the component, the entire component is heated and continuously cooled by liquid glass solder, thus preventing stress cracking. Furthermore, vitrification onto the carrier membrane 16 can be reliably performed without relying on the component, and especially without relying on the connecting sleeve 1.

[0060] According to another embodiment, strain gauge 12 is designed as a thin-film strain gauge. Similar to a membrane strain gauge, a thin-film strain gauge is advantageously a technique that applies a piezoresistive strain gauge to a carrier membrane 16. The thin-film strain gauge is advantageously manufactured in a thin-film printing method.

[0061] According to another embodiment, strain gauge 12 is designed as a thick-film strain gauge. Advantageously, piezoresistive paste is applied directly to the connecting sleeve 1 during a printing method.

[0062] As an alternative to strain gauge 12, the strain sensor is designed as a piezoelectric ceramic sensor. Once mechanical pressure is applied to the connecting sleeve 1, the piezoelectric ceramic sensor advantageously generates a voltage. The generated voltage can then be evaluated as a measurement signal.

[0063] According to an alternative to strain gauge 12 and piezoelectric ceramic sensor, a capacitance measurement method can be used. Specifically, the strain of connecting sleeve 1 represents the displacement of the capacitor's plates towards the fixed plates. The change in capacitance is advantageously derived from the change in distance. This change in capacitance can then be evaluated as a measurement signal.

[0064] In another alternative to the aforementioned strain gauge sensor, an inductive measurement method is used. To detect the strain of the connecting sleeve, a measuring inductor is used. The measuring inductor is preferably excited by an AC voltage. Advantageously, the change in measuring inductance due to the distance change is detected by downstream electronics.

[0065] Specifically, strain gauge sensors are arranged in measuring channels 24. These measuring channels 24 are formed in the outer wall 14 of the measuring section 10 and extend parallel to the fluid channel axis X. Figure 1 , 2 and Figures 4 to 8 In this design, the measuring groove 24 is formed such that the measuring groove 24 of the connecting sleeve 1 extends over the entire axial range of the measuring section 10. Advantageously, according to an example not shown, more than one strain gauge sensor can also be arranged in a common measuring groove 24. Particularly advantageously, the measuring groove 24 is formed symmetrically about the fluid channel axis X and / or has a flat measuring groove bottom 28 extending parallel to the fluid channel axis X. The introduction of two measuring grooves 24, through the removal of material from the connecting sleeve 1, further advantageously results in a higher degree of strain in the measuring section 10.

[0066] like Figure 2 As shown, the measuring groove 24 has a measuring groove depth 26 formed radially toward the bottom 28 of the measuring groove relative to the fluid channel axis X, wherein the wall of the connecting sleeve 1 is held between the bottom 28 of the measuring groove and the fluid channel 2 with the remaining wall thickness. Advantageously, the measuring groove depth 26 of the bottom 28 of the measuring groove 24 corresponds at most to the minimum outer perimeter of the connecting sleeve 1 outside the measuring section 10.

[0067] The depth of the measuring groove 26 and the remaining wall thickness are designed such that the maximum internal pressure present in at least the functional piping system does not cause plastic deformation of the connecting sleeve 1. Specifically, the depth of the measuring groove 26 and the remaining wall thickness of the connecting sleeve 1 are designed to adapt to the internal pressure in the fluid channel 2, such that the connecting sleeve 1 can preferably be loaded with a maximum internal pressure, particularly 3200 bar, advantageously exceeding 3200 bar, in the fluid channel 2 without plastic deformation. Advantageously, the depth of the measuring groove 26 and the remaining wall thickness are designed to adapt to the internal pressure in the fluid channel 2, such that the connecting sleeve 1 can be loaded with a safety pressure without plastic deformation. The safety pressure is formed, in particular, by multiplying the maximum internal pressure in the fluid channel 2 by a safety factor. The safety factor is particularly 1.5 to 6.5, preferably 2 to 6, preferably 3 to 5, and particularly preferably 4.

[0068] like Figure 1 , 6 As shown in Figures 7, 9, and 10, in an advantageous embodiment, a receiving groove 18 extending circumferentially around the outer wall 14 of the measuring section 10 is formed in the outer wall 14. Advantageously, this surrounding receiving groove 18 is used for integrating the circuitry of a sensor system and / or, particularly, for a connection interface of a sensor system for a strain gauge sensor and / or is especially preferably used for integrating a strain gauge sensor. For example, Figure 9 and 10The strain gauge sensor is integrated into the surrounding receiving slot 18. The receiving slot 18 in the connecting sleeve 1 prevents the sensor system from being randomly arranged on the connecting sleeve 1. The sensor system is not located in... Figure 1 , 6 As shown in Figures 7, 9, and 10. Specifically, the circuit may include electrical conductors and / or printed circuit boards and / or voltage sources and / or other circuit elements. Connection interfaces are particularly designed as transmitters and / or receivers and / or plugs and / or sockets and / or connecting cables. The arrangement of the strain gauge sensor in the receiving slot 18 offers both manufacturing advantages, as the surrounding receiving slot 18 is easier to manufacture, and the advantage of avoiding damage caused by assembly tools such as open-end wrenches.

[0069] Particularly advantageously, the strain gauge sensors are arranged in the flat portion 42 within the receiving slot 18, such as... Figure 9 As shown, the flat portion 42 is arranged either in the measuring groove 24 or in the transition area between the measuring groove 24 and the receiving groove 18. The flat portion 42 provides additional protection. The flat portion 42 is particularly easier to manufacture in the surrounding receiving groove 18 than in the axial measuring groove 24.

[0070] like Figure 1 and Figures 5 to 10 As shown, the receiving groove 18 is preferably located in the middle of the connecting sleeve 1. The receiving groove 18 preferably has a receiving groove depth 20 formed radially toward the bottom 22 of the receiving groove relative to the fluid channel axis X, wherein the wall of the connecting sleeve 1 is held between the bottom 22 of the receiving groove and the fluid channel 2 with its remaining wall thickness. The receiving groove depth 20 and the remaining wall thickness are designed such that the maximum internal pressure occurring at least in the functional piping system will not cause plastic deformation of the connecting sleeve 1. In particular, the receiving groove depth 20 and the remaining wall thickness of the connecting sleeve 1 are designed according to the same pressure design requirements as the measuring groove 24 regarding the measuring groove depth 26 and the remaining wall thickness of the connecting sleeve 1.

[0071] The receiving slot 18 and the measuring slot 24 provide protection for the sensor system, particularly for the strain gauge sensor and / or circuitry and / or connection interfaces.

[0072] The connecting sleeve 1 is designed with an outer surface 30 facing away from the fluid channel 2. This outer surface 30 preferably has a coating, particularly an anti-corrosion coating. This coating has the particular advantage of making the connecting sleeve 1 more resistant to external influences and improving the service life of the connecting sleeve 1.

[0073] Particularly preferably, the strain gauge 12 is advantageously arranged on a coating, particularly an anti-corrosion coating. The anti-corrosion coating is particularly preferably designed as a zinc-nickel layer. Advantageously, a zinc-nickel layer with a transparent or black passivation is used. Specifically, the passivation is an inorganic conversion layer formed on the zinc-nickel layer, which is formed by immersion in a chemical solution suitable for this purpose. Here, the solution is advantageously a trivalent chromium compound. In particular, the advantage of placing the strain gauge 12 on the coating is that the manufacture and coating of the connecting sleeve 1 are easier, and the strain gauge 12 is not damaged during the coating of the connecting sleeve 1.

[0074] According to an advantageous embodiment (not shown), a voltage source is disposed on the connecting sleeve 1 itself. A power supply voltage can be applied to the sensor system via this voltage source. The voltage source is advantageously a battery and is particularly disposed in the receiving slot 18. The voltage source eliminates the need for an external voltage supply and increases the independence of the connecting sleeve 1, especially when combined with cableless or wireless data transmission. This configuration is particularly advantageous in remote or hard-to-reach locations.

[0075] Particularly advantageously, the sensor system's connection interface is designed as an inductive connection interface. Specifically, such as... Figure 8 As shown, the power supply voltage can be transmitted to the sensor system via the connection interface. In this case, the power supply voltage can be inductively transmitted via... Figure 7 and Figure 8 The clip 32 shown is used for transmission. According to... Figure 8 The clamp 32 is specifically designed to fit within the measuring section 10, particularly within the receiving slot 18.

[0076] The connection interface of the sensor system is advantageously designed as a cable-free or wireless connection interface, through which data can be transmitted from and / or to the sensor system. For example, the wireless or cable-free connection interface can be designed as an inductive, radio, Bluetooth, or WiFi connection interface.

[0077] In particular, Figure 8 In the illustrated embodiment, the sensor system is connected to the control unit via an inductive connection interface. Specifically, the control unit is connected to clip 32 via a cable. Figure 7 and Figure 8 In the image, only the plug 34 for connecting to the cable is shown on the clip 32. Preferably, as... Figure 8 As shown, the clamp 32 for connecting the cable surrounds the receiving groove 18 and the connection interface disposed therein. In particular, the sidewall 36 of the receiving groove 18, which points axially toward the fluid channel axis X, prevents the clamp 32 from shifting axially.

[0078] In an advantageous embodiment, the connection interface of the sensor system is designed as an inductive connection interface, through which data can be transmitted from and / or to the sensor system. Specifically, the supply voltage is inductively transmitted from the control unit to the sensor system, and preferably, the measurement signal, strain output as a change in resistance or a change in voltage, is transmitted to the control unit. Particularly advantageously, both the voltage input and the measurement signal output are transmitted through the same connection interface, particularly as... Figure 8 The connection interface shown is surrounded by clip 32.

[0079] The clip 32 is preferably designed so that it can be manually fitted onto the connecting interface by an assembler, particularly onto the receiving slot 18. Preferably, the clip 32 is widened manually or with tools in the elastic region and then clamped, locked, or secured onto the connecting sleeve 1 by means of elastic rebound. Alternatively, the clip 32 can be plastically deformed, especially under the influence of temperature, and pressed or shaped onto the connecting sleeve 1 by hand and / or with tools. The clip 32 is advantageously disposed on the connecting sleeve 1 using a force- and form-fitting arrangement.

[0080] To broaden the application range of the connecting sleeve 1, the connection interface of the sensor system, in an advantageous embodiment not shown, is designed as a transmitter element and / or receiver element for generating and / or receiving radio, Bluetooth, or WiFi signals. Here, the control unit has transmitter and / or receiver elements designed and configured corresponding to the aforementioned transmitter and / or receiver elements. In particular, the wired connection from the control unit to the sensor system can be eliminated, expanding the versatility of the application locations of the connecting sleeve 1 and the retrieval locations of the control unit. Furthermore, by laying separate wiring, the risk of accidents and assembly costs are reduced. In this sense, the connecting sleeve 1 particularly advantageously includes transmitter and / or receiver elements and a voltage source arranged on the connecting sleeve 1.

[0081] Particularly advantageously, the control unit is a mobile device that receives measurement signals directly or indirectly via a receiver element from the connection interface of the connecting sleeve 1. Mobile devices include, in particular, mobile phones, tablets, and laptops. Direct connection is particularly, for example, via Bluetooth, where the control unit and the sensor system communicate directly with each other. Indirect connection is particularly a connection where a device, such as a network device, is connected to make the measurement signals available to the network, for example, via a WiFi-based connection. In particular, indirect connection enables both protected, network-restricted access to the measurement signals and remote access to the measurement signals via the Internet.

[0082] according to Figures 5 to 8In the advantageous embodiment of 10, the measuring section 10, at least in part, is cast in plastic 38 along with the strain gauge sensor, particularly the sensor system, especially the connection interface and / or voltage source. Specifically, if the connection interface is connected to the control unit via a cable, at least one connection point for connecting the cable is preferably formed.

[0083] Especially Figure 5 In particular, the entire measuring groove 24 and receiving groove 18 are cast with plastic 38 over the entire measuring groove depth 26 and / or receiving groove depth 20, thereby creating a smooth or uniform outer wall 14 of the measuring section 10 of the connecting sleeve 1. According to Figure 9 In an exemplary embodiment having only the receiving slot 18, according to an embodiment not shown, the receiving slot 18 may advantageously be cast with plastic 38 over the entire depth 20 of the receiving slot.

[0084] exist Figures 6 to 8 and Figure 10 In the exemplary embodiment shown, the measuring groove 24 and / or the receiving groove 18 are advantageously cast partially on the measuring groove depth 26 and the receiving groove depth 20. According to... Figure 10 In the exemplary embodiment having only the receiving groove 18, the receiving groove 18 is advantageously partially cast with plastic 38 at the receiving groove depth 20. In particular, the remaining sidewall 40 of the receiving groove 18 is retained so that clips 32 or other connecting elements for contacting the casting connection points can be arranged in the remaining receiving groove 18.

[0085] In one particular embodiment, the sensor system has at least one temperature sensor for determining the ambient temperature and / or the temperature of the connecting sleeve 1. The temperature sensor can improve the measurement quality of the pressure measurement by counteracting the thermal strain effect of the medium flowing in the fluid pipeline.

[0086] Specifically, the connecting sleeve 1 is made of steel with a zinc-nickel coating. Alternatively, the connecting sleeve 1 may also be made of other materials with variations, provided that the internal pressure in the fluid channel 2 causes the connecting sleeve 1 to strain or deform within an elastic range, and the deformation behavior is known in such a way that the control unit can determine the internal pressure. In particular, the deformation behavior can be determined by testing. The connecting sleeve 1 is advantageously made at least in part of stainless steel, brass, or plastic 38.

[0087] According to the present invention, the control unit for connecting to the sensor system for measuring the fluid pressure of the connecting sleeve 1 of the above type has a connection device for data technology connection with the sensor system of the connecting sleeve 1 and a calculation device for calculating the fluid pressure in the connecting sleeve 1 based on the received data and based on the line and / or medium-specific parameters stored in the control unit.

[0088] According to an advantageous embodiment of the control unit, the computing device is designed to calculate the temperature of the medium located in the fluid channel based on measurement data and parameters. Specifically, the control unit can determine the temperature of the medium located in the fluid channel 2 by measuring the pressure in the fluid channel 2. Advantageously, a reference point for the initial position can be determined if at least the temperature of the medium and the strain in the measurement section 10 are known. From this reference point, conclusions about the medium temperature can be drawn by relative strain, including pipeline and / or specific medium parameters.

[0089] according to Figure 7 and Figure 8 In the illustrated embodiment, the control unit preferably has a clip 32 for a connecting cable designed as an inductive connection interface. This clip is specifically designed to surround the receiving slot 18 and the connection interface disposed therein, such as the connecting sleeve 1. The clip 32 preferably has one or more of the features described above and is fitted onto the connecting sleeve 1, as... Figure 7 and Figure 8 The explanation given.

[0090] This invention is not limited to the illustrated and described embodiments, but also includes embodiments that have the same function in the sense of the invention. It is emphasized that the embodiments are not limited to all features in combination; more precisely, each individual sub-feature may also have inventive significance independently of all other sub-features. Furthermore, the invention is not limited to the combination of features defined in claim 1, but may also be defined by any other combination of specific features of all the individual features disclosed in the whole. This means that, in principle, each individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in this application.

[0091] List of reference numerals

[0092] 1. Connecting sleeve

[0093] 2. Fluid Channel

[0094] 4 First connection end

[0095] 6 Second connection end

[0096] 8 External threads

[0097] 10 Measurement Sections

[0098] 12 Strain Gauges

[0099] 13 Strain Measurement Sensor

[0100] 14. Outer wall of the measurement section

[0101] 16. Carrier membrane

[0102] 18 receiving slots

[0103] 20 Receiving slot depth

[0104] 22 Bottom of the receiving slot

[0105] 24 Measuring groove

[0106] 26 Measuring groove depth

[0107] 28 Bottom of measuring groove

[0108] 30 Outer surface of the connecting sleeve

[0109] 32 clips

[0110] 34 plugs

[0111] 36. Side wall of the receiving slot

[0112] 38 Plastics

[0113] 40 Remaining sidewalls

[0114] 42 Flat section

[0115] X Fluid Channel Axis

Claims

1. A connecting sleeve (1) for guiding fluid in a pipeline system, the connecting sleeve having a fluid channel (2) extending along a fluid channel axis (X), wherein, The fluid channel (2) is connected to the pipeline channel of the pipeline system at at least a first connection end (4) and a second connection end (6) of the connecting sleeve (1), wherein a measuring section (10) is formed between the first connection end (4) and the second connection end (6), and a sensor system for measuring the pressure of the medium flowing in the fluid channel (2) is provided in the measuring section, wherein the sensor system has a connection interface, and the sensor system can be connected to a control unit for measuring the pressure in the fluid channel (2) via the connection interface. The sensor system for measuring pressure has at least two strain gauge sensors, which are offset from each other on the outer wall (14) of the measuring section (10) around the fluid channel axis (X). The strain gauge sensors are respectively arranged in measuring grooves (24), which are formed in the outer wall (14) of the measuring section (10) and extend parallel to the fluid channel axis (X). The corresponding measuring groove (24) has a flat measuring groove bottom (28) extending parallel to the fluid channel axis (X), wherein a receiving groove (18) extending circumferentially around the outer wall (14) of the measuring section (10) is designed in the outer wall (14) of the measuring section (10), the receiving groove being used to integrate the electronic circuitry of the sensor system and / or strain gauge sensor.

2. The connecting sleeve (1) according to claim 1, characterized in that, The strain gauge sensor is offset by 90° or 180° around the fluid channel axis (X) on the periphery.

3. The connecting sleeve (1) according to claim 1, characterized in that, The strain gauge sensors are arranged offset from each other along the fluid channel axis (X).

4. The connecting sleeve (1) according to claim 1, characterized in that, The strain gauge sensor is designed as a strain gauge (12) having at least one strain measurement sensor (13).

5. The connecting sleeve (1) according to claim 4, characterized in that, The strain gauges (12) extend along the axis (X) of the fluid channel in their longitudinal direction.

6. The connecting sleeve (1) according to claim 4, characterized in that, The strain gauge (12) has two strain measurement sensors (13) on the carrier membrane (16), wherein the first strain measurement sensor (13) measures the strain in the longitudinal direction and the second strain measurement sensor (13) measures the strain in the transverse direction.

7. The connecting sleeve (1) according to claim 4, characterized in that, The strain measurement sensor (13) is electrically connected in the sensor system to form a full Wheatstone bridge.

8. The connecting sleeve (1) according to claim 4, characterized in that, At least one strain measurement sensor (13) is electrically connected in the sensor system for resistance lookup.

9. The connecting sleeve (1) according to claim 4, characterized in that, The strain gauge (12) is a highly sensitive strain gauge (12) that is advantageously capable of at least 10 -4 Strain can be measured with an accuracy of mm.

10. The connecting sleeve (1) according to claim 4, characterized in that, The strain gauge (12) is assembled onto the connecting sleeve (1) by a combination of bonding and glass welding methods.

11. The connecting sleeve (1) according to claim 10, characterized in that, The strain gauge (12) is designed as a silicon strain gauge (12).

12. The connecting sleeve (1) according to claim 1, characterized in that, The corresponding measuring groove (24) is formed symmetrically with respect to the fluid channel axis (X).

13. The connecting sleeve (1) according to claim 1, characterized in that, The depth (26) of the measuring groove bottom (28) of the measuring groove (24) corresponds at most to the minimum outer perimeter of the connecting sleeve (1) outside the measuring section (10).

14. The connecting sleeve (1) according to claim 1, characterized in that, The connecting sleeve (1) has an anti-corrosion coating on at least the outer surface (30) opposite to the fluid channel (2), wherein the strain gauge sensor is disposed on the anti-corrosion coating.

15. The connecting sleeve (1) according to claim 1, characterized in that, A voltage source is provided on the connecting sleeve (1) and can be used to apply a power supply voltage to the sensor system.

16. The connecting sleeve (1) according to claim 15, characterized in that, The voltage source is a battery, which is disposed in the receiving slot (18) of the connecting sleeve (1).

17. The connecting sleeve (1) according to claim 1, characterized in that, The connection interface of the sensor system is designed as an inductive connection interface, through which the power supply voltage for the sensor system can be transmitted.

18. The connecting sleeve (1) according to claim 1, characterized in that, The sensor system's connection interface is designed as a wireless connection interface, through which data can be transmitted from or to the sensor system.

19. The connecting sleeve (1) according to claim 1, characterized in that, The sensor system's connection interface is designed as a wireless connection interface, which enables data to be transmitted from and to the sensor system.

20. The connecting sleeve (1) according to claim 18, characterized in that, The connection interface of the sensor system is designed as an inductive connection interface, through which data can be transmitted from or to the sensor system.

21. The connecting sleeve (1) according to claim 19, characterized in that, The connection interface of the sensor system is designed as an inductive connection interface, through which data can be transmitted from and to the sensor system.

22. The connecting sleeve (1) according to claim 18, characterized in that, The connection interface of the sensor system is designed as a transmitter or receiver element for generating or receiving radio, Bluetooth, or WiFi signals.

23. The connecting sleeve (1) according to claim 19, characterized in that, The sensor system's connection interface is designed as a transmitter element and a receiver element for generating and receiving radio, Bluetooth, or WiFi signals.

24. The connecting sleeve (1) according to claim 1, characterized in that, The measuring section (10) is cast in plastic (38) at least in part together with the strain gauge (12).

25. The connecting sleeve (1) according to claim 24, characterized in that, The measurement section (10) is cast in plastic (38) at least in part together with the sensor system.

26. The connecting sleeve (1) according to claim 24, characterized in that, The measuring groove (24) and the receiving groove (18), together with the strain gauge (12), are cast in plastic (38).

27. The connecting sleeve (1) according to claim 24, characterized in that, The entire outer surface (30) of the connecting sleeve (1), together with the strain gauge (12), is cast in plastic (38).

28. The connecting sleeve (1) according to claim 1, characterized in that, The sensor system has a temperature sensor for determining the ambient temperature or the temperature of the connecting sleeve.

29. The connecting sleeve (1) according to claim 1, characterized in that, The sensor system has a temperature sensor for determining the ambient temperature and the temperature of the connecting sleeve.

30. A control unit for connection to a sensor system for measuring the fluid pressure of the connecting sleeve (1) according to claim 1, characterized in that... A connection device for data connection with the sensor system of the connecting sleeve (1) and a calculation device for calculating the fluid pressure in the connecting sleeve (1) based on the received data and based on line or medium-specific parameters stored in the control unit.

31. A control unit for connection to a sensor system for measuring the fluid pressure of the connecting sleeve (1) according to claim 1, characterized in that... A connection device for data connection with the sensor system of the connecting sleeve (1) and a calculation device for calculating the fluid pressure in the connecting sleeve (1) based on the received data and based on the line and medium-specific parameters stored in the control unit.

32. The control unit according to claim 30 or 31, characterized in that, The computing device is designed to calculate the temperature of the medium located in the fluid channel (2) based on measurement data and parameters.

33. The control unit according to claim 30 or 31, characterized in that... A clip (32) for connecting cables designed as an inductive connection interface, the clip being designed to surround the receiving slot (18) of the connecting sleeve (1) and the connection interface disposed therein.

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