Method and device for measuring dynamic flow of nuclear reactor fluid

Abstract

The invention relates to a nuclear reactor fluid dynamic flow measuring method and device, in the nuclear reactor fluid dynamic flow measuring method, a dynamic pressure sensor is directly arranged at a throttling position in a pipeline, and a pressure measuring point is built in to replace a traditional pressure guide pipe transmission structure; the fluid pressure measuring point and the space distance of the primary instrument are shortened, real-time conversion from a fluid pressure signal to an electric signal is achieved, the phenomena of pressure signal hysteresis, oscillation and attenuation caused by the too long pressure guiding pipe and the cavity effect of the pressure transmitting cavity are avoided, and therefore the pressure response speed, the measurement real-time performance and the accuracy of a dynamic measurement value are remarkably improved. Besides, through the direct built-in layout of the sensors and the pressure measuring points, an external pressure guide pipe and an auxiliary installation space are omitted, the overall structure of the flowmeter is compact, and therefore the adaptability and deployment flexibility of measurement in narrow spaces in the fields of nuclear power and the like are improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor fluid flow measurement, and more particularly to a method and apparatus for measuring dynamic flow of nuclear reactor fluids. Background Technology

[0002] In nuclear reactors, throttling flow meters are widely used due to their high reliability. Throttling flow meters typically rely on pressure taps (usually long, thin, flexible tubes) to transmit fluid pressure to a differential pressure sensor. Current thermal hydraulic research has raised the need for dynamic flow measurement for fluctuating flows. However, existing throttling flow meters suffer from excessively long pressure taps and cavity effects in the sensor's pressure transmission chamber, leading to pressure transmission hysteresis, oscillations, and attenuation, thus failing to meet the requirements of dynamic flow measurement. Furthermore, excessively long pressure taps also result in the flow meter occupying additional space, leading to poor adaptability to compact spaces. Summary of the Invention

[0003] This invention provides a method and device for measuring the dynamic flow rate of fluids in a nuclear reactor, which can solve the above-mentioned technical problems.

[0004] This invention provides a method for measuring the dynamic flow rate of fluids in a nuclear reactor, comprising: Set a throttling position inside the pipe to be tested; The dynamic pressure sensor is directly placed at the throttling position inside the pipe to be tested; The dynamic pressure sensor measures the pressure value before the throttling position in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value before throttling. The dynamic pressure sensor measures the pressure value after throttling in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value after throttling. The dynamic flow rate is calculated based on the real-time pressure value before throttling and the real-time pressure value after throttling.

[0005] Preferably, the dynamic pressure sensor includes a dynamic differential pressure sensor.

[0006] Preferably, the method for measuring the dynamic flow rate of nuclear reactor fluids further includes: A flow guiding channel is provided inside the pipeline to be tested, the dynamic pressure sensor is installed inside the flow guiding channel, and the throttling position is located inside the flow guiding channel; The test pipe is used to allow the fluid to flow in and out after being measured at the throttling position.

[0007] The present invention also provides a measuring device, which is applied to the nuclear reactor fluid dynamic flow measurement method described in any of the above technical solutions, the measuring device comprising: A throttling component is disposed within the pipe to be tested, the throttling component dividing the pipe to be tested into a pre-throttling channel and a post-throttling channel; and The measuring component includes a body and a dynamic pressure sensor. The body has a mounting cavity, a first pressure tap, and a second pressure tap. The mounting cavity is connected to the first pressure tap and the second pressure tap, respectively. The throttling component passes through the body. The first pressure tap is connected to the pre-throttling channel, and the second pressure tap is connected to the post-throttling channel. The dynamic pressure sensor is disposed in the mounting cavity.

[0008] Preferably, the measuring device further includes a flow guide shell, which has a flow guide channel for fluid flow; Preferably, the flow guide shell includes an upstream shell and a downstream shell, the upstream shell, the throttling component and the downstream shell are connected in sequence, and the upstream shell and the downstream shell together define the flow guide channel.

[0009] Preferably, the upstream housing is provided with an upstream flange face at one end, and the downstream housing is provided with a downstream flange face at one end; The throttling assembly includes a flange and a throttling ring. The flange is fitted over the throttling ring, and the throttling ring is fitted over the body. The throttling ring has multiple throttling holes. One surface of the flange is connected to the upstream flange face, and the other surface of the flange is connected to the downstream flange face. Thus, the throttling ring divides the flow guiding channel into a pre-throttling channel and a post-throttling channel.

[0010] Preferably, the throttling assembly includes a venturi tube, one end of which is aligned with and connected to the upstream housing, and the other end of which is aligned with and connected to the downstream housing; or The throttling assembly includes a throttling nozzle disposed between the upstream housing and the downstream housing; or The throttling assembly includes an orifice plate disposed within the flow guiding channel, and the periphery of the orifice plate is connected to the inner wall surface of the flow guiding channel.

[0011] Preferably, the central axis of the first pressure tap is perpendicular to the central axis of the body; and / or The central axis of the second pressure tap is perpendicular to the central axis of the body.

[0012] Preferably, the rear end of the body is provided with a potting hole, which is exposed in the throttling channel and communicates with the mounting cavity. The potting hole is for the signal line of the dynamic pressure sensor to pass through.

[0013] Preferably, each end of the body is provided with a rectifier structure, which includes a hemispherical structure, a rounded corner structure, or a rectifier grid structure.

[0014] The implementation of this invention has the following beneficial effects: This invention relates to a method and device for measuring the dynamic flow rate of nuclear reactor fluids. In this method, a dynamic pressure sensor is directly placed at the throttling position inside the pipeline, and the pressure measuring point is built-in, replacing the traditional pressure-feeding pipe transmission structure. This shortens the spatial distance between the fluid pressure measuring point and the primary instrument, and realizes real-time conversion of fluid pressure signal to electrical signal. It avoids pressure signal hysteresis, oscillation and attenuation caused by excessively long pressure-feeding pipes and the cavity effect of pressure transmission chamber, thereby significantly improving the pressure response speed, measurement real-time performance and accuracy of dynamic measurement values.

[0015] Furthermore, the direct built-in layout of sensors and pressure measuring points eliminates the need for external pressure taps and auxiliary installation space, making the overall structure of the flow meter more compact and thus improving its adaptability and deployment flexibility in narrow spaces such as nuclear power plants.

[0016] In this measuring device, the throttling component can directly create a pressure difference before and after the measuring component. Pressure measuring points are set upstream and downstream of the measuring component body. Through the first and second pressure taps, the pressure before and after the throttling component is transmitted to the dynamic pressure sensor, thus achieving pressure measurement. Based on the high-frequency response characteristics of the dynamic pressure sensor, the pressure signal is directly processed, converted, and output (to the secondary instrument). In application, the measuring device of this invention, through the built-in pressure measuring points and dynamic flow meter, can directly measure the pressure difference before and after throttling without a pressure tapping pipe. This avoids the pressure transmission lag, oscillation, and attenuation phenomena caused by pressure tapping pipes, improving the flow meter's instantaneous flow capture capability, measurement real-time performance, and the accuracy of dynamic measurement values. Furthermore, it eliminates the need for the flow meter to occupy space outside the measured pipeline, improving its adaptability to compact spaces. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0018] Figure 1 These are schematic diagrams of the measuring device in some embodiments of the present invention; Figure 2 From another perspective Figure 1 A schematic diagram of the measuring device shown; Figure 3 These are exploded views of the measuring device in some embodiments of the present invention; Figure 4 From another perspective Figure 3 Exploded view of the measuring device shown; Figure 5 These are schematic diagrams of the throttling component and the measuring component in some embodiments of the present invention; Figure 6 These are schematic diagrams of the internal structure of the measuring device in some embodiments of the present invention; Figure 7 This is a flowchart of a method for measuring the dynamic flow rate of nuclear reactor fluids in some embodiments of the present invention. Detailed Implementation

[0019] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be more thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0020] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Figure 7 The present invention illustrates a method for measuring the dynamic flow rate of fluids in a nuclear reactor in some embodiments. It is mainly used in nuclear reactor thermal-hydraulic experimental equipment to measure the dynamic flow rate of fluids, and can also be applied to the measurement of dynamic flow rate of fluids in other equipment of a nuclear reactor.

[0024] Methods for measuring the dynamic flow rate of fluids in nuclear reactors include: Set a throttling position inside the pipe to be tested; The dynamic pressure sensor is directly placed at the throttling position inside the pipe to be tested; The dynamic pressure sensor measures the pressure value before the throttling position in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value before throttling. The dynamic pressure sensor measures the pressure value after throttling in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value after throttling. The dynamic flow rate is calculated based on the real-time pressure value before throttling and the real-time pressure value after throttling.

[0025] Direct placement of the dynamic pressure sensor allows for its integration into the throttling position within the pipe under test, or it can be placed within a structure that allows the fluid to flow, with that structure then positioned within the throttling position of the pipe. This shortens the transmission path from the pressure measurement point to the sensor's sensing element, minimizing the physical contact path between the sensor's sensitive element and the fluid. This mitigates pressure transmission hysteresis and avoids signal attenuation and phase delay caused by traditional pressure taps. Furthermore, by placing the dynamic pressure sensor directly within the flow field, chamber resonance is avoided, minimizing signal distortion caused by bubble accumulation.

[0026] Real-time pre-throttling pressure measurement refers to capturing fluid pressure data upstream of the throttling element, before it is affected by throttling, while real-time post-throttling pressure measurement refers to collecting pressure data downstream of the throttling zone. Both the pre-throttling and post-throttling pressure values ​​are transmitted in real time, allowing for the derivation of the real-time flow rate from these two pressure values. Simultaneous dual-channel measurement of data before and after throttling minimizes the signal time difference, ensuring the consistency of the differential pressure calculation timeline.

[0027] Preferably, the dynamic pressure sensor is a dynamic differential pressure sensor.

[0028] It should be noted that configuring the dynamic pressure sensor as a dynamic differential pressure sensor can simultaneously measure the dynamic differential pressure fluctuation between two points before and after the throttling position, output the instantaneous differential pressure signal, and convert the instantaneous differential pressure value into an electrical signal.

[0029] Preferably, the method for measuring the dynamic flow rate of nuclear reactor fluids further includes: A flow guide channel is set inside the pipe to be tested, and a dynamic pressure sensor is set inside the flow guide channel. The throttling position is located inside the flow guide channel. The pipe to be tested allows the fluid to flow in and out after passing through the throttling position.

[0030] The setting of a flow channel refers to constructing a flow channel structure with a constant cross-section inside the pipe to be tested, constraining the flow direction of the fluid, so that the fluid maintains an axisymmetric flow stability state as much as possible before throttling (approximately a vortex-free and fully developed pipe flow).

[0031] Figures 1 to 4 A measuring device 10 according to some embodiments of the present invention is shown, which includes a throttling component 2 and a measuring component 3.

[0032] like Figures 1 to 6 As shown, the throttling component 2 is disposed inside the pipe to be tested, and the throttling component 2 divides the pipe to be tested into a pre-throttling channel 131 and a post-throttling channel 132.

[0033] The measuring component 3 includes a body 31 and a dynamic pressure sensor 32. The body 31 has a mounting cavity 311, a first pressure tapping hole 312 and a second pressure tapping hole 313. The mounting cavity 311 is connected to the first pressure tapping hole 312 and the second pressure tapping hole 313 respectively. The throttling component 2 passes through the body 31. The first pressure tapping hole 312 is connected to the pre-throttling channel 131 and the second pressure tapping hole 313 is connected to the post-throttling channel 132. The dynamic pressure sensor 32 is disposed in the mounting cavity 311.

[0034] Understandably, the throttling component 2 is disposed in the flow guiding channel 13, and its function is to generate a throttling effect when the fluid flows, dividing the flow guiding channel 13 into a pre-throttling channel 131 and a post-throttling channel 132, thereby forming a pressure difference before and after the measuring component 3, providing a basis for flow measurement.

[0035] The mounting cavity 311 on the main body 31 provides a space for the dynamic pressure sensor 32 and ensures that it is connected to the pressure measuring point on the main body through the first pressure tap 312 and the second pressure tap 313, thus realizing pressure transmission before and after throttling. The function of the first pressure tap 312 is to allow the fluid in the channel 131 before throttling to directly transmit pressure to the dynamic pressure sensor 32 through the pressure measuring point. The function of the second pressure tap 313 is to allow the fluid in the channel 132 after throttling to directly transmit pressure to the dynamic pressure sensor 32 through the pressure measuring point. The dynamic pressure sensor 32 receives the pressure signal / pressure difference signal transmitted from the first pressure tap 312 and the second pressure tap 313, and based on its high-frequency response characteristics, directly processes, converts, and outputs the pressure signal (to the secondary instrument) to obtain the instantaneous flow rate value. Both the first pressure tap 312 and the second pressure tap 313 can acquire pressure signals in real time, which avoids hysteresis, oscillation, and attenuation caused by excessively long pressure transmission paths, and also achieves integration within a small space.

[0036] In summary, this embodiment, through the integrated design of the throttling component 2 and the measuring component 3, enables direct measurement of pressure difference without the need for a pressure tapping pipe. This effectively avoids pressure transmission lag, oscillation, and attenuation, improving the response speed, real-time measurement, and accuracy of dynamic measurement values ​​of the measuring device. Furthermore, all components are built into the pipe under test, significantly reducing external space occupation and enhancing adaptability in compact spaces.

[0037] like Figures 1 to 6 As shown, the measuring device also includes a flow guide shell 1, which has a flow guide channel 13 for fluid flow, and a throttling component 2 is disposed in the flow guide channel 13.

[0038] Understandably, the flow guide shell 1 can be configured to directly replace a portion of the pipe under test.

[0039] like Figures 1 to 6 As shown, in some embodiments of the measuring device 10, the flow guide shell 1 includes an upstream shell 11 and a downstream shell 12. The upstream shell 11, the throttling component 2, and the downstream shell 12 are connected in sequence, and the upstream shell 11 and the downstream shell 12 together define the flow guide channel 13.

[0040] Understandably, the upstream shell 11 serves as a guide structure for the fluid inlet, and the downstream shell 12 serves as a guide structure for the fluid outlet. The two are connected in sequence to the throttling assembly 2 to form a stable flow channel 13, thereby simplifying the assembly process of the flow guide shell 1, reducing manufacturing and maintenance costs, and ensuring the continuity of fluid flow.

[0041] It should be noted that the content of this embodiment facilitates the precise installation and maintenance of the throttling component 2, while ensuring the structural integrity of the flow guiding channel 13 and improving the adaptability and long-term stability of the measuring device 10 in complex pipeline environments.

[0042] like Figures 3 to 6 As shown, in some embodiments of the measuring device 10, the end of the upstream housing 11 is provided with an upstream flange face 111, and the end of the downstream housing 12 is provided with a downstream flange face 121. The throttling assembly 2 includes a flange 21 and a throttling ring 22. The flange 21 is fitted over the throttling ring 22, and the throttling ring 22 is fitted over the body 31. The throttling ring 22 has multiple throttling holes 221. One surface of the flange 21 is connected to the upstream flange face 111, and the other surface of the flange 21 is connected to the downstream flange face 121. Thus, the throttling ring 22 divides the flow guiding channel 13 into a pre-throttling channel 131 and a post-throttling channel 132.

[0043] Understandably, the upstream flange face 111 is located at the end of the upstream housing 11, and the downstream flange face 121 is located at the end of the downstream housing 12. The two flange faces provide a standardized connection interface for the flange 21, ensuring axial alignment and sealing compression between the upstream housing 11, the downstream housing 12, and the throttling assembly 2. The throttling ring 22 uniformly disperses the fluid through the throttling orifice 221, forming a stable pressure difference between the pre-throttling channel 131 and the post-throttling channel 132, while avoiding eddy current interference caused by single-point throttling.

[0044] Specifically, in some embodiments, the throttling component 2 may be configured to include a venturi tube, one end of which is aligned with and connected to the upstream housing 11, and the other end of which is aligned with and connected to the downstream housing 12. Understandably, in these embodiments, the tapered-expanding structure of the venturi tube can guide the fluid through a smooth transition, significantly reducing turbulence and pressure energy loss generated during the throttling process, and improving measurement efficiency.

[0045] Specifically, in some embodiments, the throttling assembly 2 may be configured to include a throttling nozzle disposed between the upstream housing 11 and the downstream housing 12. It is understood that the short-channel structure of the throttling nozzle enables rapid response to high-speed fluids and is suitable for operating conditions with large instantaneous flow fluctuations.

[0046] Specifically, in some embodiments, the throttling component 2 may be configured to include an orifice plate disposed within the flow channel 13, with the periphery of the orifice plate connected to the inner wall of the flow channel 13.

[0047] Understandably, orifice plates have the advantages of simple structure and mature technology, which can significantly reduce manufacturing costs while ensuring basic throttling function.

[0048] like Figure 6 As shown, in some embodiments of the measuring device 10, the central axis L2 of the first pressure tap 312 is perpendicular to the central axis L1 of the body 31.

[0049] Understandably, the central axis of the first pressure tapping hole 312 is perpendicular to the central axis of the body 31. Its function is to shorten the pressure transmission path, so that the fluid pressure in the pre-throttling channel 131 is transmitted vertically to the dynamic pressure sensor 32 with the shortest distance, avoiding flow resistance interference caused by oblique pressure tapping.

[0050] like Figure 6 As shown, in some embodiments of the measuring device 10, the central axis L3 of the second pressure tap 313 is perpendicular to the central axis LA of the body 31.

[0051] Understandably, the central axis of the second pressure tap 313 is perpendicular to the central axis of the body 31. Its function is to directly capture the axial static pressure of the channel 132 after throttling, so as to avoid pressure transmission distortion caused by turbulence after throttling.

[0052] like Figure 5 and Figure 6 As shown, in some embodiments of the measuring device 10, the end of the body 31 is provided with a glue-filling hole 314, which is exposed in the throttling channel 132 and is connected to the mounting cavity 311. The glue-filling hole 314 is used for the signal line of the dynamic pressure sensor 32 to pass through.

[0053] Understandably, the potting hole 314 serves two purposes: firstly, it provides a sealed passage for the signal line of the dynamic pressure sensor 32; secondly, it acts as a potting inlet for filling with sealant to prevent fluid penetration.

[0054] It should be noted that after the glue has cured, the potting hole 314 can fill the gap between the signal line and the hole wall, preventing fluid from entering the mounting cavity 311, thereby protecting the dynamic pressure (differential pressure sensor).

[0055] like Figures 3 to 6As shown, in some embodiments of the measuring device 10, a rectifier structure 315 is provided at each end of the body 31; wherein, the rectifier structure 315 includes a hemispherical structure, a rounded corner structure, or a rectifier grid structure. It can be understood that the rectifier structure 315 provided at both ends of the body 31 can improve the flow stability of the fluid, avoid the formation of turbulence, and ensure the reliability of the pressure tapping orifice, thereby ensuring the reliability of the measurement results.

[0056] It should be noted that the rectifier structures set on both ends of the main body 31 can be the same or different. That is, the same type of rectifier structure can be set on both ends of the main body 31, or different types of rectifier structures can be set on both ends of the main body 31. The specific adjustment can be made according to the design and usage requirements of the product.

[0057] like Figure 7 As shown, the measuring device also includes a line protection structure; wherein the line protection structure includes at least two configuration methods: Firstly, the outgoing line protection structure is installed on the signal line. Thus, the outgoing line protection structure is installed on the signal line to directly cover the exposed signal line.

[0058] Secondly, the cable protection structure is located at the opening of the potting hole; this can prevent the opening from damaging the signal cable.

[0059] Thirdly, bevels, protective plugs, spring tubes, and plastic sleeves can be installed at the signal line exit point and in easily worn locations along the routing path to protect the signal line until it exits the conduit.

[0060] Furthermore, the lead wires can be thickened to protect the internal wiring.

[0061] Furthermore, a plastic sheath, such as Teflon (polytetrafluoroethylene), can be fitted over the signal cable. Alternatively, a wire mesh can be placed over the plastic sheath.

[0062] Specifically, the dynamic pressure sensor 32 is a dynamic differential pressure sensor.

[0063] Understandably, the dynamic pressure sensor 32 is configured as a dynamic differential pressure sensor, whose function is to capture instantaneous high-frequency fluctuations in fluid pressure / differential pressure and convert the dynamic pressure signal into an electrical signal output.

[0064] It should be noted that dynamic pressure sensors directly analyze changes in pressure amplitude, making them suitable for dynamic operating conditions such as pumping fluids. Dynamic differential pressure sensors synchronously track pressure difference fluctuations before and after throttling, eliminating cumulative errors caused by signal phase differences.

[0065] In some embodiments of the measuring device 10, the body 31 and the throttling component 2 are integrally formed.

[0066] It should be noted that the body 31 and the throttling component 2 are integrally formed, which can eliminate the assembly gap and make the measuring component 3 and the throttling component 2 form a rigid whole without interface integration, preventing the fluid from flowing through the gap between the body 31 and the throttling component 2, and ensuring the throttling effect of the throttling component 2.

[0067] In some embodiments of the measuring device 10, the throttling assembly 2 is welded to the body 31.

[0068] Understandably, the throttling component 2 and the body 31 are connected by welding, which can form a stable and reliable sealing fit at the mating position of the two.

[0069] Specifically, the measuring component 3 also includes a sealing ring, which is disposed between the inner wall surface of the mounting cavity 311 and the dynamic pressure sensor 32. The sealing ring is used to seal the mating gap between the inner wall surface of the mounting cavity 311 and the dynamic pressure sensor 32.

[0070] Understandably, the function of the sealing ring is to elastically fill the fitting gap, form a reliable pressure isolation, and prevent the first pressure tap 312 and the second pressure tap 313, the second pressure tap 313 and the glue potting hole from communicating within the mounting cavity 311, thus ensuring stable and reliable measurement results.

[0071] The implementation of this invention has the following beneficial effects: This invention relates to a method and device for measuring the dynamic flow rate of nuclear reactor fluids. In this method, a dynamic pressure sensor is directly placed at the throttling position inside the pipeline, and the pressure measuring point is built-in, replacing the traditional pressure-feeding pipe transmission structure. This shortens the spatial distance between the fluid pressure measuring point and the primary instrument, and realizes real-time conversion of fluid pressure signal to electrical signal. It avoids pressure signal hysteresis, oscillation and attenuation caused by excessively long pressure-feeding pipes and the cavity effect of pressure transmission chamber, thereby significantly improving the pressure response speed, measurement real-time performance and accuracy of dynamic measurement values.

[0072] Furthermore, the direct built-in layout of sensors and pressure measuring points eliminates the need for external pressure taps and auxiliary installation space, making the overall structure of the flow meter more compact and thus improving its adaptability and deployment flexibility in narrow spaces such as nuclear power plants.

[0073] In this measuring device, the throttling component can directly create a pressure difference before and after the measuring component. Pressure measuring points are set upstream and downstream of the measuring component body. Through the first and second pressure taps, the pressure before and after the throttling component is transmitted to the dynamic pressure sensor, thus achieving pressure measurement. Based on the high-frequency response characteristics of the dynamic pressure sensor, the pressure signal is directly processed, converted, and output (to the secondary instrument). In application, the measuring device of this invention, through the built-in pressure measuring points and dynamic flow meter, can directly measure the pressure difference before and after throttling without a pressure tapping pipe. This avoids the pressure transmission lag, oscillation, and attenuation phenomena caused by pressure tapping pipes, improving the flow meter's instantaneous flow capture capability, measurement real-time performance, and the accuracy of dynamic measurement values. Furthermore, it eliminates the need for the flow meter to occupy space outside the measured pipeline, improving its adaptability to compact spaces.

[0074] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the embodiments of the present invention can be adjusted in order, combined, and deleted according to actual needs, and the modules in the device of the embodiments of the present invention can be combined, divided, and deleted according to actual needs.

[0075] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A measuring device, characterized in that, include: A throttling component is disposed inside the pipe to be tested, and the throttling component divides the pipe to be tested into a pre-throttling channel and a post-throttling channel; and The measuring component includes a body and a dynamic pressure sensor. The body has a mounting cavity, a first pressure tap, and a second pressure tap. The mounting cavity is connected to the first pressure tap and the second pressure tap, respectively. The throttling component passes through the body. The first pressure tap is connected to the pre-throttling channel, and the second pressure tap is connected to the post-throttling channel. The dynamic pressure sensor is disposed in the mounting cavity.

2. The measuring device according to claim 1, characterized in that, The measuring device also includes a flow guide shell, which has a flow guide channel for fluid flow.

3. The measuring device according to claim 2, characterized in that, The flow guide shell includes an upstream shell and a downstream shell, the upstream shell, the throttling component and the downstream shell are connected in sequence, and the upstream shell and the downstream shell together define the flow guide channel.

4. The measuring device according to claim 3, characterized in that, The upstream shell is provided with an upstream flange face at its end, and the downstream shell is provided with a downstream flange face at its end; The throttling assembly includes a flange and a throttling ring. The flange is fitted over the throttling ring, and the throttling ring is fitted over the body. The throttling ring has multiple throttling holes. One surface of the flange is connected to the upstream flange face, and the other surface of the flange is connected to the downstream flange face. Thus, the throttling ring divides the flow guiding channel into a pre-throttling channel and a post-throttling channel.

5. The measuring device according to claim 3, characterized in that, The throttling assembly includes a venturi tube, one end of which is aligned with and connected to the upstream housing, and the other end of which is aligned with and connected to the downstream housing; or The throttling assembly includes a throttling nozzle disposed between the upstream housing and the downstream housing; or The throttling assembly includes an orifice plate disposed within the flow guiding channel, and the periphery of the orifice plate is connected to the inner wall surface of the flow guiding channel.

6. The measuring device according to any one of claims 1 to 5, characterized in that, The central axis of the first pressure tap is perpendicular to the central axis of the body; and / or The central axis of the second pressure tap is perpendicular to the central axis of the body.

7. The measuring device according to any one of claims 1 to 5, characterized in that, The main body is provided with a rectifier structure at each end, and the rectifier structure includes a hemispherical structure, a rounded corner structure, or a rectifier grid structure.

8. A method for measuring the dynamic flow rate of a nuclear reactor fluid, applied to the measuring device described in any one of claims 1 to 7, characterized in that, The method for measuring the dynamic flow rate of nuclear reactor fluids includes: Set a throttling position inside the pipe to be tested; The dynamic pressure sensor is directly placed at the throttling position inside the pipe to be tested; The dynamic pressure sensor measures the pressure value before the throttling position in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value before throttling. The dynamic pressure sensor measures the pressure value after throttling in real time through a pressure measuring point built into the pipeline, thereby obtaining the real-time pressure value after throttling. The dynamic flow rate is calculated based on the real-time pressure value before throttling and the real-time pressure value after throttling.

9. The method for measuring dynamic flow rate of nuclear reactor fluids according to claim 8, characterized in that, The dynamic pressure sensor includes a dynamic differential pressure sensor.

10. The method for measuring dynamic flow rate of nuclear reactor fluids according to claim 8, characterized in that, The method for measuring the dynamic flow rate of nuclear reactor fluids also includes: A flow guiding channel is provided inside the pipeline to be tested, the dynamic pressure sensor is installed inside the flow guiding channel, and the throttling position is located inside the flow guiding channel; The test pipe is used to allow the fluid to flow in and out after being measured at the throttling position.

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