Devices for placement on fluid guiding lines and for attaching flow meters, and methods for measuring variables of fluid guided by the lines.

Abstract

This application relates to a device (10) for arrangement on a fluid guiding line and for attachment of a flow meter (21), specifically, the flow meter is an ultrasonic flow meter. The device (10) is used to detect a measured variable of fluid guided by the line. The device (10) has: a first connecting part (12) and a second connecting part (14), through which the device (10) can be connected to the fluid guiding line; a measuring area (16) arranged between the first connecting part (12) and the second connecting part (14), and capable of being connected to the flow meter to detect the measured variable, wherein the first connecting part (12), the measuring area (16), and the second connecting part (14) are limited. A flow path (A) is defined for the fluid passing through the device (10); and a flow influencing element (22) is arranged in and / or on the flow path (A) and is arranged in front of the measuring area (16) and at a distance from the measuring area (16) in the flow direction along the flow path (A), wherein the flow influencing element (22) is integrally formed with the first connection (12) or the second connection (14), and wherein the flow influencing element (22) is designed such that the fluid flowing into the device (10) via the first connection (12) has a generally turbulent flow in the measuring area (16), and the fluid flows into the device (10) in a generally laminar flow.

Description

Technical Field

[0001] This application relates to an apparatus for placement on a fluid guiding line and for attaching a flow meter, and a method for detecting a measurement variable of fluid guided by the line. Background Technology

[0002] In the automation of industrial or laboratory processes, flow measurement is performed in piping, pipe, and hose systems to monitor the process. Among these, online flow measurement devices and clamp-on flow measurement devices are used for flow measurement. Online flow measurement devices have a measuring sensor installed in the flow distribution of the fluid or medium to be measured, while clamp-on flow measurement devices are externally placed and clamped onto the pipeline, pipe, or hose that guides the fluid or medium.

[0003] Clamp-on flow measurement devices are also known, wherein the device is mounted in a plastic hose through which the fluid or medium is guided. The flow measurement device is fastened to the device, which inputs an appropriate signal, such as an ultrasonic signal, to the device embedded in the plastic hose, and performs flow measurement using the output signal received via the device. Summary of the Invention

[0004] The purpose of this application is to provide a device for attaching a flow meter to a fluid guiding pipeline, which improves the accuracy of flow measurement. Additionally, the purpose of this application is to propose a method for detecting a measured variable of fluid guided by a pipeline, which enables the detection of the measured variable with the highest possible accuracy.

[0005] This objective is achieved through the subject matter of the independent claim. Preferred embodiments are implemented in the dependent claims.

[0006] The first aspect relates to a device for arrangement on a fluid guiding line and for attachment of a flow meter, particularly an ultrasonic flow meter, for detecting a measured variable of fluid guided by said line, wherein said device has:

[0007] - A first connecting part and a second connecting part, through which the device can be connected to the fluid guiding line.

[0008] A measuring area, arranged between the first connecting portion and the second connecting portion, and connectable to the flow meter, is provided for detecting the measured variable, wherein the first connecting portion, the measuring area, and the second connecting portion define a flow path for the fluid through the device.

[0009] - A flow-influencing element, arranged in and / or on the flow path, and positioned in front of the measurement area at a certain distance from the measurement area, along the established flow direction of the fluid along the flow path.

[0010] Wherein, the flow-influencing element is integrally formed with the first connecting portion or the second connecting portion, and

[0011] The flow-influencing element is designed such that the fluid flowing into the device via the first connection has a generally turbulent flow in the measurement area, wherein the fluid has a generally laminar flow in the device.

[0012] Advantageously, the arrangement of the flow-influencing element enables improved measurement accuracy of the detected variables, even at low fluid velocities and / or low volumetric flow rates along the flow path. Preferably, the bandwidth of the fluid velocity and / or the bandwidth of the fluid volumetric flow rate can be increased, allowing for more precise detection of the measured variables. Bandwidth can be understood as a region limited by lower values ​​at the bottom and higher values ​​at the top. For example, the bandwidth of velocity can be limited downwards by lower velocity values ​​and upwards by higher velocity values. The bandwidth of volumetric flow rate can also be limited downwards by lower volumetric flow rates and upwards by higher volumetric flow rates. In particular, it has been recognized that the presence of substantially turbulent rather than laminar flow in the measurement region can improve measurement accuracy. Without explicitly committing to a particular theory, it is assumed that due to the presence of turbulence, the various layers of fluid or medium have similar velocities in the direction of the flow path when viewed across a cross-section, thereby improving measurement accuracy. In other words, the fluid or medium has substantially similar or constant velocities across the cross-section of the flow path. Conversely, in laminar flow, the velocity decreases from the center of the flow path cross-section toward the outer regions of the flow path cross-section, such that the corresponding velocity distribution across the cross-section is approximately parabolic. The cross-section of the flow path can specifically correspond to the planar portion of the device that passes through it at an angle of 90° to the longitudinal axis or (main)flow direction of the fluid, and can refer to the region enclosed by the device, particularly the internal cross-section of the device.

[0013] Specifically, the Reynolds number can be used to distinguish between laminar and turbulent flow. Assuming ideal pipe flow, the critical Reynolds number for the expected transition from laminar to turbulent flow is assumed to be approximately 2300. Since the Reynolds number is affected by the fluid density, the average velocity of the fluid relative to the apparatus, the characteristic length of the apparatus or flow path, and the dynamic viscosity of the fluid, the location and size of the flow influencing element must be appropriate for the application, for example, the expected viscosity or velocity of the fluid. The corresponding location and size relationships of the flow influencing element can be determined through computer-aided simulation. Preferably, the location and design of the flow influencing element achieve a Reynolds number of at least 2300 before reaching the measurement region.

[0014] Advantageously, the one-piece design of the flow-influencing element with a first or second connection allows the flow-influencing element to be arranged at a fixed distance relative to the measuring area. Surprisingly, it has been found that the fixed positioning of the flow-influencing element relative to the measuring area results in a reliable formation of a suitable flow distribution or turbulence within the measuring area, particularly over large velocity regions and / or large temperature ranges and / or varying fluid viscosities. In particular, it has been recognized that turbulent distributions exist in the measuring area even with increasing fluid velocity and varying viscosities. This makes the device easy to use because the distance of the flow-influencing element relative to the measuring area does not need to be adjusted, while ensuring a suitable flow distribution within the measuring area. Specifically, "one-piece" means that the flow-influencing element is integrally formed with the first or second connection and / or the flow-influencing element is securely or integrally connected to the first or second connection. The one-piece design also facilitates easy calibration of the flow meter.

[0015] Preferably, the device can be provided with an available bandwidth for the flow rate and / or an available bandwidth for the volumetric flow rate, at which the measured variable is detected. Specifically, the measured variable can be detected specifically within the available bandwidth. Preferably, the flow-influencing element is designed such that the fluid in the measurement region has turbulence starting at approximately 10% to 20% of the volumetric flow rate from the upper limit of the available bandwidth, for example, the maximum volumetric flow rate of the available bandwidth that limits the upward volumetric flow rate.

[0016] Preferably, the available bandwidth of the volumetric flow rate can be from about >0 ml / min to 4000 ml / min, and particularly preferably from about >0 ml / min to 5000 ml / min.

[0017] Preferably, the device can be used for fluids with a (dynamic) viscosity of 0.6 mPa·s(cP) to 4.2 mPa·s(cP), more preferably 0.8 mPa·s(cP) to 4.0 mPa·s(cP).

[0018] Specifically, the first and second connecting portions, as well as the measuring area disposed between the first and second connecting portions, may have channels or flow channels that define a flow path through which fluid or media flows. As a fluid guiding line connectable to the first and second connecting portions, a pipe or hose, for example made of plastic, may be provided. For example, to attach the device to the line, the line may be disconnected such that a first open end of the line is connected to the first connecting portion, and a second open end of the line is connected to the second connecting portion, such that the device connects the first and second open ends of the line.

[0019] Preferably, the flow path or channel is formed in an elongated manner and extends in a generally straight line. In particular, it may be configured such that the flow path is not curved or tortuous, for example, does not have a 90° bend, so that the main flow direction of the fluid or medium through the device is generally constant.

[0020] In particular, the fluid or medium may be a liquid, and may also have solid components, such as particulate or cellular components. However, this application is not limited to fluids in liquid form.

[0021] Preferably, the flow-influencing element is designed such that, when viewed from the flow direction, the transition point from laminar to turbulent flow is ahead of the measurement area. Advantageously, turbulence can thus be present throughout the entire measurement area.

[0022] Preferably, the flow meter can connect an input signal, such as an ultrasonic signal, to the measurement area and receive an output signal based on the input signal via the measurement area. Using the input and output signals, the flow meter can detect measurement variables related to flow measurement, such as volumetric flow rate or mass flow rate. In particular, the flow meter can be a clamp-on flow meter.

[0023] Preferably, the first and second connecting portions may have at least a generally circular (inner) cross-section along the flow path in the cross-section. Additionally, the measuring area may have at least a generally rectangular, particularly square (inner) cross-section in the cross-section, or preferably a hexagonal (inner) cross-section along the flow path.

[0024] Preferably, the flow influencing element can be designed as a cross-sectional contraction of the flow path, wherein the cross-sectional area of ​​the flow path immediately before and after the flow influencing element is larger than the (minimum) cross-sectional area of ​​the flow path of the flow influencing element. Preferably, the cross-sectional area of ​​the flow path of the flow influencing element can be about 6% to 20% smaller than the cross-sectional area of ​​the flow path immediately before and after the flow influencing element, preferably about 8% to 15% smaller, and particularly about 8.5% to 12% smaller. Additionally, the flow path may be characterized by a sharp transition to and from the flow influencing element.

[0025] Advantageously, the change from laminar to turbulent flow can be achieved by correspondingly reducing the cross-sectional area of ​​the flow path through the flow-influencing element.

[0026] Preferably, the flow-influencing element can be designed as a protrusion extending into the flow path from the wall surrounding the flow path, the protrusion being formed by a first connection, a second connection, and a measurement area.

[0027] Specifically, the flow-influencing element can be designed as a generally annular constriction, which is preferably constructed in this manner. For example, the flow-influencing element can be formed entirely on the inner side of the wall surrounding the flow path and aligned laterally with the longitudinal direction of the device or the flow direction. The constriction can also be constructed in the shape of a crown plug. Furthermore, the dimension of the flow-influencing element in the flow direction can be less than or equal to the dimension by which the flow-influencing element protrudes from the wall into the flow path.

[0028] Preferably, the cross-sectional area of ​​the flow path of the flow-influencing element is at least about 30% smaller than the cross-sectional area of ​​the flow path at the first connection at the beginning of the flow path, and preferably at least about 40% smaller. Additionally, the cross-sectional area of ​​the flow path of the flow-influencing element is at most about 70% smaller than the cross-sectional area of ​​the flow path at the first connection at the beginning of the flow path, and preferably at most about 65% smaller.

[0029] Preferably, the first connection and / or the second connection may each have a channel forming at least a portion of a flow path, wherein fluid may flow into or out of the device at a first end of the channel, and the measuring area is arranged at a second end of the channel. Preferably, the first connection through which the fluid or medium flows into the device has a flow-influencing element. Additionally, the second connection may also have another flow-influencing element. Advantageously, this eliminates the need to consider the direction of fluid flow when the device is installed in a pipeline. Preferably, the other flow-influencing element may be integrally formed with the second connection.

[0030] Specifically, the channels of the first and second connecting portions may have a generally circular (inner) cross-section, wherein the cross-section gradually tapers from the first end of the channel in the direction of the flow-influencing element, and wherein, preferably, the cross-section of the channel widens from the flow-influencing element in the direction of the second end of the channel.

[0031] Furthermore, the first and / or second connecting portions can be detachably connected to the measuring area to achieve a modular design of the device. Specifically, the first and second connecting portions, as well as the measuring area, can each be designed as an elongated hollow body capable of being detachably connected to each other. Additionally, the first and second connecting portions can be designed to be rotationally symmetrical with respect to their respective longitudinal axes, which extend approximately parallel to the main flow direction of the medium through the device.

[0032] Preferably, the channel of the first or second connection portion can taper gradually in a conical shape from its first end in the direction of the flow-influencing element. Advantageously, the conical design of the channel allows the fluid velocity to increase in front of the flow-influencing element, which enhances the effect of the flow-influencing element. Furthermore, the cross-sectional area of ​​the flow path at the first end of the channel can be larger than the cross-sectional area of ​​the flow path of the flow-influencing element.

[0033] Furthermore, the channel of the first or second connection may taper gradually in a conical shape from the second end of the channel along the direction of the flow-influencing element. Therefore, the channel tapers in a conical shape towards the flow-influencing element from both directions. Additionally, the cross-sectional area of ​​the flow path at the first and / or second end of the channel may be larger than the cross-sectional area of ​​the flow path of the flow-influencing element. Advantageously, the conical design of the channel allows for easy production of the first or second connection, especially if the first or second connection is produced by injection molding.

[0034] Additionally, the first and / or second connecting portions and the measuring area can be manufactured using injection molding and are made of plastic material. Advantageously, due to the tapered shape of the first and / or second connecting portions from their respective ends toward the flow-influencing element, the first and / or second connecting portions can be easily produced using injection molding. Alternatively, the first and / or second connecting portions and / or the measuring area can be produced using 3D printing methods.

[0035] Preferably, the first connection and / or the second connection can be designed such that the fluid guiding line can be arranged on the first connection and / or the second connection in a self-locking manner, wherein the first connection and / or the second connection can be specifically designed as a flexible olive-shaped portion or a flexible needle.

[0036] Additionally, the measuring area may have a channel that at least partially forms a flow path. In this case, the channel may extend between two openings, wherein a first connection receiver for the first connection portion is disposed at the first opening of the two openings, and a second connection receiver for the second connection portion is disposed at the second opening of the two openings. Thus, the device has a modular structure and can be assembled by connecting the first connection portion to, preferably detachably to, the first connection receiver and connecting the second connection portion to, preferably detachably to, the second connection receiver, such that the measuring area is located between the first and second connection portions.

[0037] Specifically, the first and second connection receivers may be designed to be conical in the longitudinal direction of the device or measuring area, and may be further configured such that the first and second connections have complementary conical shapes and are inserted into the respective connection receivers for connection to the measuring area.

[0038] Preferably, the first connecting portion and / or the second connecting portion can each be fixed to the measuring area by a fixing element. The fixing element, such as a coupling nut or lock, is used to removably fasten the first connecting portion and / or the second connecting portion to the measuring area.

[0039] Advantageously, the modular design allows the device to be adapted to specific applications. Thus, depending on the application, the device can be configured with connections that incorporate desired flow-influencing elements.

[0040] Preferably, the measurement area may have at least two contact surfaces that extend at least partially along the flow path, wherein the contact surfaces are connectable to a flow meter, preferably designed as a clamp-on flow meter. Specifically, the contact surfaces may be arranged outside the measurement area, wherein the normal vector of the contact surfaces is preferably substantially perpendicular to the longitudinal axis of the device or the flow direction. For connecting the flow meter and performing flow measurement, a corresponding signal converter or sensor of the flow meter may be arranged to contact the contact surfaces, preferably over a large area, to input a signal, such as an ultrasonic signal, into the device, wherein the signal is detected by the flow meter after passing through the flow path. The measured variable can be determined by comparing the input signal with the detected signal. Preferably, the at least two contact surfaces are arranged opposite each other relative to the flow path. Preferably, the measurement area has six contact surfaces arranged in a substantially hexagonal configuration when viewed from the flow direction.

[0041] Preferably, the measuring area is spaced from the flow-influencing element by 5 to 60 times the diameter of the flow-influencing element in the direction of fluid flow through the device. This diameter is understood as the minimum diameter of the flow-influencing element transverse to the longitudinal direction of the device or the flow direction. Additionally, this distance refers to the distance between the end of the flow-influencing element located in the main flow direction and the beginning of the measuring area or the contact surface positioned relative to the main flow direction.

[0042] Additionally, the flow meter may have two housing halves that are movable relative to each other, allowing the flow meter to be opened and closed. When the flow meter is open, it is coupled to a measurement area, which is arranged on a measurement area receiver of the flow meter. By closing the flow meter, the measurement area is fixed within the flow meter, particularly within the measurement area receiver, allowing the flow meter's sensor system to contact the measurement area, specifically the contact surface. In particular, flow measurement can be performed when the flow meter is closed.

[0043] The second aspect relates to a system having the apparatus and flow meter according to the first aspect. Furthermore, the flow meter can be designed as described above.

[0044] The third aspect relates to a method for detecting a measurement variable of fluid guided by a pipeline, comprising:

[0045] The device according to the first aspect will be arranged on the fluid guiding line;

[0046] Flow meters are placed in the measurement area;

[0047] To allow fluid to flow through the flow path; and

[0048] Perform flow measurement.

[0049] Alternatively, the flow meter can be designed as described above.

[0050] In addition, the method can provide the flow characteristics of the fluid flowing into the device through the first connection, which are affected by the flow-influencing element, so that the fluid or medium has turbulence in the measurement area.

[0051] The fourth aspect relates to the use of the apparatus according to the first aspect for measuring fluid flow rate. Attached Figure Description

[0052] Other features, details, and advantages of this application will become apparent from the following description and accompanying drawings, which illustrate exemplary embodiments of this application. In all the drawings, corresponding objects or elements have the same reference numerals. In the drawings:

[0053] Figure 1 A perspective view is shown of a device for arrangement on a fluid guide line and for attaching a flow meter;

[0054] Figure 2 A cross-sectional view of the device is shown;

[0055] Figure 3 The measurement area of ​​the device is shown;

[0056] Figure 4 A cross-sectional view of the measurement area is shown;

[0057] Figure 5 The connection part of the device is shown;

[0058] Figure 6A and Figure 6B The measurement results of a conventional device are shown;

[0059] Figures 7A to 7C The first design and related measurement results of the flow-affecting element are shown;

[0060] Figures 8A to 8C The second design and related measurement results of the flow-affecting element are shown;

[0061] Figures 9A to 9CThe third design and related measurement results of the flow-affecting element are shown;

[0062] Figures 10A to 10C The fourth design and related measurement results of the flow-affecting element are shown; and

[0063] Figures 11A to 11C The fifth design and related measurement results of the flow-affecting element are shown. Detailed Implementation

[0064] Figure 1 A perspective view of device 10 is shown. Device 10 is for mounting on a fluid guide line (not shown) and for attaching a flow meter (not shown). Device 10 has a first connection 12 and a second connection 14, by means of which device 10 can be mounted on a fluid guide line or between two fluid guide lines. A measuring area 16 is disposed between the first connection 12 and the second connection 14, and the flow meter can be mounted in the measuring area 16.

[0065] The first connection 12, the measuring area 16, and the second connection 14 define a flow path A through which a fluid or medium can flow through the device 10. For example, the first connection 12 may be connected to a fluid guide line, such as a plastic hose, through which fluid or media can be supplied to the device 10. Additionally, the second connection 14 may also be connected to a fluid guide line through which fluid or media flows from the device 10 into the fluid guide line. Specifically, the fluid may be in liquid form, and solid particles such as cellular components may also be present in the fluid.

[0066] Specifically, the first connecting portion 12, the second connecting portion 14, and the measuring area 16 can form a channel 24 / 30 defining a flow path A, through which fluid or medium can flow. In particular, the flow path A or the channel can be formed in an elongated manner. Preferably, the flow path A is substantially straight, such that the main flow direction A of the fluid or medium passing through the device 10 is substantially constant.

[0067] exist Figure 1 In the illustrated embodiment, the device 10 has a modular structure, wherein the first connecting portion 12 and the second connecting portion 14 are each detachably connected to the measuring area 16. A fixing element 18 is configured to fasten or secure the first connecting portion 12 and the second connecting portion 14 to the measuring area 16. In the illustrated embodiment, the fixing element 18 is designed as a coupling nut, by which the first connecting portion 12 and the second connecting portion 14 can be fastened to the measuring area 16.

[0068] The measuring region 16 has at least two contact surfaces 20, which extend at least partially along the flow path A or the main flow direction A on the outer side of the measuring region 16. Preferably, the contact surfaces 20 are arranged opposite to each other relative to the flow path A, and in particular, extend parallel to each other. Figure 1 In the illustrated embodiment, the measurement region 16 has six contact surfaces 20 arranged in a hexagonal pattern. Specifically, two opposing contact surfaces 20 form a contact surface pair, such that the measurement region 16 has three contact surface pairs.

[0069] like Figure 2 As shown in the cross-sectional view of the device 10, the device 10 has a flow influencing element 22 arranged in or on a flow path A. The flow influencing element 22 is arranged in front of the measurement region 16 along the main flow direction A and is designed such that the fluid or medium flowing into the device 10 has a substantially turbulent flow in the measurement region 16, the fluid or medium flowing into the device 10 in a substantially laminar flow. By influencing the flow of the fluid or medium towards turbulence, the measurement accuracy of the flow rate measurement can be improved. In the illustrated embodiment, the flow influencing element 22 is formed on the inner side of the channel 30 of the first connection 12 and, in particular, can extend into the flow path A, where the flow influencing element 22 causes the cross-section of the flow path A to narrow. In particular, the flow influencing element 22 can be integrally formed with the first connection 12. It is also conceivable that the flow influencing element 22 can be integrally formed with the second connection 14.

[0070] By arranging a flow meter 21 at the measurement area 16, the contact surface 20 can be connected to the flow meter 21. Additionally, the flow meter 21 may have a corresponding sensor system 23, through which the flow meter 21 inputs an input signal, such as an ultrasonic signal, to the measurement area 16 via the contact surface 20, and receives an output signal based on the input signal. Based on the comparison of the input and output signals, the measured variable of the fluid or medium flowing through the measurement area 16 can be determined.

[0071] Figure 3 An example of an embodiment of the measuring region 16 is shown. The measuring region 16 is designed as an elongated hollow body and has a channel 24 that defines a flow path. Connecting receivers 28 are provided at each of the longitudinal ends 26 of the measuring region 16, and each of the connecting receivers 28 can receive a connecting portion 12 / 14, such as a first connecting portion 12 or a second connecting portion 14. Contact surfaces 20 of the measuring region 16 are arranged between the connecting receivers 28.

[0072] like Figure 4 As shown in the figure, the route along the path is... Figure 3The cross-section of the measurement area 16 shown, taken by the CC line, reveals six contact surfaces 20 arranged in a hexagonal pattern. The contact surfaces 20 are preferably rectangular, wherein their longitudinal direction extends approximately parallel to or parallel to the main flow direction A of the fluid or medium through the device 10. Furthermore, the internal cross-sectional shape of the measurement area 16 surrounded by the contact surfaces 20 is also hexagonal.

[0073] in addition, Figure 5 Examples of connectors that can be used, for example, as a first connector 12 and / or a second connector 14, are shown. Connectors 12 / 14 are designed as elongated hollow bodies with channels 24 defining a partial flow path. Specifically, connectors 12 / 14 may be rotationally symmetrical about their longitudinal axis. A first end 32 (the end on the measuring area side) located in the longitudinal direction of connector 12 / 14 may be designed to be received by a connector receiver 28. A second end 34 (the pipeline side end) of connector 12 / 14, opposite the first end 32 in the longitudinal direction, may be designed to connect to a pipeline. Specifically, the second end 34 may have a hose olive-shaped portion 36 or a hose spike 36 through which the pipeline can be secured to connector 12 / 14 or device 10.

[0074] Furthermore, the connecting portion 12 / 14 has a flow influencing element 22, which, when viewed from the longitudinal direction A, is arranged approximately centrally within the connecting portion 12 / 14 and extends from the wall 38 surrounding the connecting portion 12 / 14 into the flow path A. Additionally, the connecting portion 12 / 14 has a generally circular internal cross-section, wherein the cross-section of the flow path A gradually tapers from the first end 32 along the direction of the flow influencing element 22 and from the second end 34 along the direction of the flow influencing element 22. Furthermore, the cross-sectional area of ​​the flow path A immediately before and after the flow influencing element 22 is larger than the cross-sectional area of ​​the region containing the flow influencing element 22. Specifically, starting from each first end 32 and second end 34, the flow path A can be designed to gradually taper in the direction of the flow influencing element 22.

[0075] Reference Figures 6A to 11C The effects of the flow-influencing element 22 and its various implementations will be discussed below.

[0076] Here, Figure 6A and Figure 6B The standard deviation of the measurement signal of a conventional device without the flow-influencing element 22 according to this application is shown. Figure 6A The measurement signal for the positive flow direction is shown, i.e., when the fluid or medium flows along... Figure 1 When the main flow direction A shown flows through device 10, and Figure 6B The measurement signal for the opposite flow direction is shown. Here, the nonlinear behavior of the flow meter can be observed at a volumetric flow rate of 400 to 450 ml / min. Additionally, the standard deviation of the measurement signal of 40 indicates strong signal noise at a volumetric flow rate of 400 to 450 ml / min.

[0077] Figures 7A to 7C The first embodiment involves the flow-affecting element 22. For example... Figure 7A As shown, the flow-influencing element 22 is completely formed as an annular contraction on the inner side of the channel 30.

[0078] and Figure 6A and Figure 6B compared to, Figure 7A The implementation shown demonstrates a significant improvement in flow measurement. Figure 7B and Figure 7C This shows that the transition point from laminar to turbulent flow has shifted towards lower volumetric flow rates. Now, in the forward flow direction ( Figure 7B ) and negative or reverse flow direction ( Figure 7C Of the two, the transition point is 100-150 ml / min. In addition, the linearity in the transition point region has been improved, and the signal noise has been reduced by an order of magnitude.

[0079] Specifically, if the dimension of the flow-influencing element 22 in the longitudinal direction of the connection portion 12 / 14 is less than or approximately equal to the dimension of the flow-influencing element 22 extending from the interior of the channel 30 into the flow path A, then the flow-influencing element 22 can be considered a contraction. Preferably, the cross-sectional area of ​​the flow path A of the flow-influencing element 22 can be about 6% to 20% smaller than the cross-sectional area of ​​the flow path A immediately before and after the flow-influencing element 22, preferably about 8% to 15% smaller, and particularly about 8.5% to 12% smaller. Furthermore, the flow path A may be characterized by a sharp transition to and from the flow-influencing element 22.

[0080] Preferably, the flow-influencing element 22 is arranged substantially centrally in the longitudinal extension of the connection portion 12 / 14. In the context of this disclosure, the arrangement of the flow-influencing element 22 around the longitudinal center point of the connection portion 12 / 14 in a region of at most ±15%, preferably at most ±10%, of the length of the connection portion 12 / 14 is considered substantially central.

[0081] Furthermore, compared to the cross-sectional area of ​​the flow path at the first end 32 and / or the second end 34 of the connecting portion 12 / 14, the cross-sectional area of ​​the flow path A in the region of the flow-influencing element 22 can be reduced by at least approximately 40%, preferably by at least approximately 45%. In particular, the first end and the second end 32 / 34 are respectively regarded as the starting end and the ending end of the longitudinal positioning of the connecting portion 12 / 14.

[0082] Figures 8A to 8C A second embodiment involving the flow-affecting element 22, wherein the contraction shown in the first embodiment is more pronounced. For example... Figure 8A As shown, the flow-influencing element 22 is entirely formed as an annular constriction on the inner side of the channel 30. Specifically, if the dimension of the flow-influencing element 22 in the longitudinal direction of the connecting portion 12 / 14 is less than or approximately equal to the dimension of the flow-influencing element 22 extending from the interior of the channel 30 into the flow path A, then the flow-influencing element 22 can be considered a constriction. Figure 7A Compared to the flow-affecting element 22 shown, Figure 8A The flow-influencing element 22 shown has a reduced cross-sectional area. In other words, the flow-influencing element 22 extends further from the inside of the channel 39 into the flow path A.

[0083] and Figure 6A and Figure 6B compared to, Figure 8A The implementation shown demonstrates a significant improvement in flow measurement. Figure 8B and Figure 8C This shows that the transition point from laminar to turbulent flow has shifted towards lower volumetric flow rates. Now, in the forward flow direction ( Figure 8B ) and negative or reverse flow direction ( Figure 8C The transition point for both is 100-150 ml / min. Furthermore, the linearity in the transition region has been improved, and the signal-to-noise ratio has been reduced by an order of magnitude.

[0084] In addition, compared with the cross-sectional area of ​​the flow path at the first end 32 and / or the second end 34 of the connection portion 12, the cross-sectional area of ​​the flow path in the region of the flow-influencing element 22 can be reduced by at least about 50%.

[0085] Figures 9A to 9C A third embodiment involving the flow-affecting element 22. For example... Figure 9AAs shown, the flow-influencing elements 22 are formed entirely in a ring-shaped distribution on the inner side of the channel 30. Preferably, the flow-influencing elements 22 are arranged substantially centrally in the longitudinal extension of the connecting portion 12 / 14. In the context of this disclosure, the arrangement of the flow-influencing elements 22 around the center of the longitudinal extension of the connecting portion 12 / 14 in a region of at most + / - 15%, preferably at most + / - 10%, of the length of the connecting portion 12 / 14 is considered substantially central.

[0086] Specifically, if the dimension of the flow-influencing element 22 in the longitudinal direction of the connection portion 12 / 14 is greater than the dimension of the flow-influencing element 22 extending into the flow path from the interior of the channel 30, then the flow-influencing element 22 can be considered as distributed. Preferably, the dimension of the flow-influencing element 22 in the longitudinal direction of the connection portion 12 / 14 is at least twice the dimension of the flow-influencing element 22 extending into the flow path A from the interior of the channel 30.

[0087] and Figure 6A and Figure 6B compared to, Figure 9A The implementation shown demonstrates a significant improvement in flow measurement. Figure 9B and Figure 9C This shows that the transition point from laminar to turbulent flow has shifted towards lower volumetric flow rates. Now, in the forward flow direction ( Figure 9B ) and negative or reverse flow direction ( Figure 9C The transition point for both is 100-150 ml / min. Furthermore, the linearity in the transition point region has been improved, and the signal-to-noise ratio has been reduced by an order of magnitude.

[0088] Furthermore, compared to the cross-sectional area of ​​flow path A at the first end 32 and / or the second end 34 of the connection portion 12, the cross-sectional area of ​​flow path A in the region of flow influencing element 22 can be reduced by at least about 40%, preferably by at least about 45%. In particular, the first end and the second end 32 / 34 are respectively regarded as the starting end and the ending end of the longitudinal positioning of the connection portion 12 / 14.

[0089] Figures 10A to 10C A fourth embodiment relates to the flow-influencing element 22. Similar to the first embodiment, the flow-influencing element 22 is entirely formed as a constriction within the channel 30, wherein the flow-influencing element 22 is additionally constructed and has grooves, so that the inner diameter of the flow path A in the region of the flow-influencing element 22 is unequal at different angles around the longitudinal axis of the connecting portion 12 / 14. From Figure 10A As can be seen, when viewed along the longitudinal direction, the structure of the flow-influencing element 22 is shaped to resemble a crown cork.

[0090] and Figure 6A and Figure 6B compared to, Figure 10A The implementation shown demonstrates a significant improvement in flow measurement. Figure 10B and Figure 10C This shows that the transition point from laminar to turbulent flow has shifted towards lower volumetric flow rates. Now, in the forward flow direction ( Figure 10B ) and negative or reverse flow direction ( Figure 10C The transition point for both is 100-150 ml / min. Furthermore, the linearity in the transition region has been improved, and the signal-to-noise ratio has been reduced by an order of magnitude.

[0091] Furthermore, compared to the cross-sectional area of ​​the flow path A at the first end 32 and / or the second end 34 of the connecting portion 12 / 14, the cross-sectional area of ​​the flow path A in the region of the flow influencing element 22 can be reduced by at least approximately 45%.

[0092] Figures 11A to 11C A fifth embodiment relates to the flow-influencing element 22. Similar to the fourth embodiment, the flow-influencing element 22 is configured in the shape of a coronal plug. The structure in the longitudinal direction of the connecting portion 12 / 14 is longer than that in the fourth embodiment. Specifically, the dimension of the flow-influencing element 22 in the longitudinal direction of the connecting portion 12 / 14 may be at least three times larger than the dimension of the flow-influencing element 22 protruding from the interior of the channel 30 into the flow path A.

[0093] and Figure 6A and Figure 6B compared to, Figure 11A The implementation shown demonstrates a significant improvement in flow measurement. Figure 11B and Figure 11C This shows that the transition point from laminar to turbulent flow has shifted towards lower volumetric flow rates. Now, in the forward flow direction ( Figure 11B ) and negative or reverse flow direction ( Figure 11C On the other hand, the transition point is 100-150 ml / min. In addition, the linearity in the transition point region has been improved, and the signal noise has been reduced by an order of magnitude.

[0094] In addition, compared with the cross-sectional area of ​​the flow path at the first end 32 and / or the second end 34 of the connection portion 12, the cross-sectional area of ​​the flow path A in the region of the flow influencing element 22 can be reduced by at least about 45%.

[0095] Reference Figures 3 to 5 The implementation of device 10 will be described in more detail. For example, Figure 3The measurement area 16 shown has a length L1 of 30 mm to 40 mm, preferably about 35 mm. Viewed in the longitudinal direction A, the contact surface 20 is centrally located on the measurement area 16 and has a length L2 between 10 mm and 14 mm. Additionally, the connector receiver 28 may have a length of 6 mm to 10 mm, allowing the first connector 12 and the second connector 14 to be inserted into the connector receiver 28 to a corresponding depth along the longitudinal direction A. Furthermore, the opposite sides of the hexagonal internal cross-section (see...) Figure 4 They may be spaced apart by a distance A1, which is between 3 mm and 3.4 mm, preferably about 3.18 mm. Alternatively, embodiments with a distance A1 of up to 9 mm are conceivable.

[0096] Figure 5 The connecting portion 12 / 14 shown may have a length L3 of 25 mm to 33 mm, preferably approximately 28.8 mm. The diameter D1 of the flow path A at the first end 32 on the measuring area side may be between 2.87 mm and 3.27 mm, preferably 3.07 mm. The diameter D2 of the flow path A at the second end 34 on the pipeline side may be between 3.17 mm and 3.57 mm, preferably 3.37 mm. In particular, the flow influencing element 22 may be designed as a constriction (as described above).

[0097] The flow-influencing element 22 can protrude completely from the interior of the channel 30 into the flow path A by a distance between 0.1 mm and 0.3 mm, preferably 0.2 mm. Specifically, the diameter D3 of the flow path A in the region of the flow-influencing element 22 can be between 2.0 mm and 2.4 mm, preferably approximately 2.2 mm. Additionally, the flow-influencing element 22 can be spaced from the first end 32 on the measuring area side by a length L4 of 11.9 mm to 15.9 mm, preferably 13.9 mm.

[0098] Explanation of reference numerals in the attached figures

[0099] 10. Devices for placement on fluid guiding lines

[0100] 12 First connecting part

[0101] 14 Second connecting part

[0102] 16 Measurement Area

[0103] 18 Fixing elements

[0104] 20 Contact Surface

[0105] 21 Flowmeter

[0106] 22 Flow-affecting elements

[0107] 23 Sensor Systems

[0108] 24. Channels in the measurement area

[0109] 26. End of the measurement area

[0110] 28 Connector receiver

[0111] 30. Connecting section channel

[0112] 32. First end of the connector (measurement area side)

[0113] 34. The second end of the connection (pipeline side)

[0114] 36. Olive-shaped part of the flexible tube or flexible needle.

[0115] 38. Wall of the self-connecting part

[0116] 40 Standard deviation of the measured signal

[0117] A. The flow path or main flow direction / longitudinal direction of the device

[0118] Other features, characteristics, and advantages of this application will be described with reference to the following points:

[0119] 1. An apparatus for being disposed on a fluid guiding line and for attaching a flow meter, particularly an ultrasonic flow meter, for detecting a measured variable of fluid guided by said line, wherein said apparatus comprises:

[0120] - A first connecting part and a second connecting part, through which the device can be connected to the fluid guiding line.

[0121] A measuring area, arranged between the first connecting portion and the second connecting portion, and connectable to the flow meter to detect the measured variable, wherein the first connecting portion, the measuring area, and the second connecting portion define a flow path for the fluid through the device.

[0122] - A flow-influencing element, arranged in and / or on the flow path, and positioned in front of the measurement area at a certain distance from the measurement area, along the established flow direction of the fluid along the flow path.

[0123] The flow-influencing element is designed such that fluid flowing into the device via the first connection has a substantially turbulent flow in the measurement region, wherein the fluid flows into the device in a substantially laminar flow.

[0124] 2. The apparatus according to point 1, wherein the flow path along the first connection portion has at least a generally circular cross-section in cross-section, and / or

[0125] Wherein, the flow path along the second connection portion has at least a generally circular cross-section in the cross-section, and / or

[0126] The flow path along the measurement area has at least a generally rectangular, particularly square, or generally hexagonal cross-section in the cross-section.

[0127] 3. The apparatus according to point 1 or 2, wherein the cross-sectional area of ​​the flow path of the flow influencing element is about 6% to 20% smaller than the cross-sectional area of ​​the flow path immediately before and preferably immediately after the flow influencing element, preferably about 8% to 15% smaller, and particularly about 8.5% to 12% smaller.

[0128] 4. The apparatus according to any one of the preceding points, wherein the measuring area is spaced from the flow influencing element in the flow direction by a distance between 5 and 60 times the diameter of the flow influencing element.

[0129] 5. The apparatus according to any one of the preceding points, wherein the flow-influencing element is designed to extend from a wall surrounding the flow path to a protrusion in the flow path.

[0130] 6. The apparatus according to any one of the preceding points, wherein the flow-influencing element is designed as a generally annular contraction, and wherein, preferably, the contraction is constructed.

[0131] 7. The apparatus according to any one of the foregoing points, wherein the cross-sectional area of ​​the flow path before and after the flow influencing element, particularly before and after the flow influencing element, is greater than the cross-sectional area of ​​the flow path in the region of the flow influencing element.

[0132] 8. The apparatus according to any of the preceding points, wherein the first connection has a channel forming at least a portion of the flow path, wherein the fluid flows in at a first end of the channel, and the measuring area is arranged at a second end of the channel, and

[0133] The first connecting part has a flow-influencing element.

[0134] 9. The apparatus according to point 8, wherein the channel has at least a generally circular cross-section in its cross-section, wherein the cross-section gradually tapers from the first end of the channel in the direction of the flow-influencing element, and wherein, preferably, the cross-section of the channel widens from the flow-influencing element in the direction of the second end of the channel.

[0135] 10. The apparatus according to any one of the preceding points, wherein the first connection and / or the second connection is designed such that the fluid guide line can be arranged in a self-locking manner on the first connection and / or the second connection, wherein the first connection and / or the second connection is particularly designed as a flexible olive-shaped portion.

[0136] 11. The apparatus according to any one of the preceding points, wherein the measuring region has at least two contact surfaces that extend at least partially along the flow path, wherein the contact surfaces are connectable to the flow meter.

[0137] 12. The apparatus according to any one of the preceding points, wherein the first connecting portion is detachably connected to the measuring area, and / or wherein the second connecting portion is detachably connected to the measuring area.

[0138] 13. The apparatus according to any one of the foregoing points, wherein the first connecting portion and / or the second connecting portion are each fixed to the measuring area by a fixing element.

[0139] 14. A method for detecting a measured variable of fluid guided by a pipeline, comprising:

[0140] The device according to any one of points 1 to 13 is arranged on the fluid guiding line;

[0141] Flow meters are placed in the measurement area;

[0142] To allow fluid to flow through the flow path; and

[0143] Perform flow measurement.

[0144] 15. The apparatus according to any one of points 1 to 13 above is used for measuring fluid flow rate.

Claims

1. A device (10) for arrangement on a fluid guiding line and for attachment of a flow meter (21), said device (10) for detecting a measured variable of fluid guided by said line, wherein, The device (10) has: The device (10) can be connected to the fluid guiding pipeline through the first connecting part (12) and the second connecting part (14); A measuring area (16) is arranged between the first connecting portion (12) and the second connecting portion (14) and is connectable to the flow meter to detect the measured variable, wherein the first connecting portion (12), the measuring area (16), and the second connecting portion (14) define a flow path (A) for the fluid to pass through the device (10); and A flow-influencing element (22) is arranged in and / or on the flow path (A), and is positioned in front of the measurement area (16) and at a certain distance from the measurement area (16) in the flow direction of the fluid along the flow path (A). The flow-influencing element (22) is integrally formed with the first connecting portion (12) or the second connecting portion (14), and The flow-influencing element (22) is designed such that the fluid flowing into the device (10) via the first connection (12) has turbulence in the measurement area (16), and the fluid flows into the device (10) in a laminar flow.

2. The apparatus (10) according to claim 1, wherein, The flow meter (21) is an ultrasonic flow meter.

3. The apparatus (10) according to claim 1 or 2, wherein, The flow path (A) along the first connection (12) has at least a circular cross-section in the cross-section, and / or Wherein, the flow path (A) along the second connection (14) has at least a circular cross-section in the cross-section, and / or The flow path (A) along the measurement area (16) has at least a rectangular or hexagonal cross section in the cross section.

4. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 6% to 20% smaller than the cross-sectional area of ​​the flow path (A) immediately preceding the flow influencing element (22).

5. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 8% to 15% smaller than the cross-sectional area of ​​the flow path (A) immediately preceding the flow influencing element (22).

6. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 8.5% to 12% smaller than the cross-sectional area of ​​the flow path (A) immediately preceding the flow influencing element (22).

7. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 6% to 20% smaller than the cross-sectional area of ​​the flow path (A) immediately before and immediately after the flow influencing element (22).

8. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 8% to 15% smaller than the cross-sectional area of ​​the flow path (A) immediately before and immediately after the flow influencing element (22).

9. The apparatus (10) according to claim 1 or 2, wherein, The cross-sectional area of ​​the flow path (A) of the flow influencing element (22) is 8.5% to 12% smaller than the cross-sectional area of ​​the flow path (A) immediately before and immediately after the flow influencing element (22).

10. The apparatus (10) according to claim 1 or 2, wherein, The measurement area (16) is separated from the flow influencing element (22) in the flow direction (A) by a distance between 5 and 60 times the diameter of the flow influencing element (22).

11. The apparatus (10) according to claim 1 or 2, wherein, The flow-influencing element (22) is designed to extend from the wall surrounding the flow path (A) to a protrusion in the flow path (A).

12. The apparatus (10) according to claim 1 or 2, wherein, The flow-influencing element (22) is designed as an annular contraction.

13. The apparatus (10) according to claim 1 or 2, wherein, The flow-influencing element (22) is designed as an annular contraction, wherein the contraction is configured in the shape of a coronal plug.

14. The apparatus (10) according to claim 1 or 2, wherein, Before and after the flow-influencing element (22), the cross-sectional area of ​​the flow path (A) is greater than the cross-sectional area of ​​the flow path in the region of the flow-influencing element (22).

15. The apparatus (10) according to claim 1 or 2, wherein, Immediately before and after the flow-influencing element (22), the cross-sectional area of ​​the flow path (A) is greater than the cross-sectional area of ​​the flow path in the region of the flow-influencing element (22).

16. The apparatus (10) according to claim 1 or 2, wherein, The first connection (12) has a channel (30) forming at least a portion of the flow path (A), wherein the fluid flows in at a first end of the channel (30), and the measuring area (16) is arranged at a second end of the channel (30), and wherein the first connection (12) has the flow influencing element (22).

17. The apparatus (10) according to claim 16, wherein, The channel (30) has at least a circular cross-section in its cross-section, wherein the cross-section gradually tapers from a first end of the channel (30) in the direction of the flow-influencing element (22), and / or The channel (30) of the first connecting part (12) tapers tapering in a conical shape from the first end of the channel (30) in the direction of the flow-influencing element (22).

18. The apparatus (10) according to claim 16, wherein, The channel (30) has at least a circular cross-section in its cross-section, wherein the cross-section gradually tapers from a first end of the channel (30) in the direction of the flow-influencing element (22), and wherein the cross-section of the channel (30) widens from the flow-influencing element (22) in the direction of a second end of the channel (30), and / or The channel (30) of the first connecting part (12) tapers tapering in a conical shape from the first end of the channel (30) in the direction of the flow-influencing element (22).

19. The apparatus (10) according to claim 16, wherein, The channel (30) has at least a circular cross-section in its cross-section, wherein the cross-section gradually tapers from a first end of the channel (30) in the direction of the flow-influencing element (22), and / or Wherein, the channel (30) of the first connecting part (12) tapers tapering in a conical shape from the first end of the channel (30) in the direction of the flow influencing element (22), and wherein, the channel (30) of the first connecting part (12) tapers tapering tapering in a conical shape from the second end of the channel (30) in the direction of the flow influencing element (22).

20. The apparatus (10) according to claim 16, wherein, The channel (30) has at least a circular cross-section in its cross-section, wherein the cross-section gradually tapers from a first end of the channel (30) in the direction of the flow-influencing element (22), and wherein the cross-section of the channel (30) widens from the flow-influencing element (22) in the direction of a second end of the channel (30), and / or Wherein, the channel (30) of the first connecting part (12) tapers tapering in a conical shape from the first end of the channel (30) in the direction of the flow influencing element (22), and wherein, the channel (30) of the first connecting part (12) tapers tapering tapering in a conical shape from the second end of the channel (30) in the direction of the flow influencing element (22).

21. The apparatus (10) according to claim 1 or 2, wherein, The first connection (12) and / or the second connection (14) are designed such that the fluid guide line can be arranged on the first connection (12) and / or the second connection (14) in a self-locking manner.

22. The apparatus (10) according to claim 1 or 2, wherein, The first connection (12) and / or the second connection (14) are designed such that the fluid guide line can be arranged on the first connection (12) and / or the second connection (14) in a self-locking manner, wherein the first connection (12) and / or the second connection (14) are designed as a flexible olive-shaped portion (36).

23. The apparatus (10) according to claim 1 or 2, wherein, The measuring area (16) has at least two contact surfaces (20) that extend at least partially along the flow path (A), wherein the contact surfaces (20) are connectable to the flow meter.

24. The apparatus (10) according to claim 1 or 2, wherein, The first connecting part (12) can be detachably connected to the measuring area (16), and / or, wherein the second connecting part (14) can be detachably connected to the measuring area (16).

25. The apparatus (10) according to claim 1 or 2, wherein, The first connecting part (12) and / or the second connecting part (14) can each be fixed to the measuring area (16) by a fixing element (18).

26. A method for detecting a measured variable of fluid guided by a pipeline, comprising: The device (10) according to any one of claims 1 to 25 is arranged on the fluid guiding line; A flow meter (21) is installed in the measurement area (16); Allow the fluid to flow through the flow path (A); and Perform the flow measurement.

27. The use of the apparatus (10) according to any one of claims 1 to 25 for measuring fluid flow rate.

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