Plug-in type gas ultrasonic flowmeter

Abstract

The utility model relates to the technical field of flow meters, in particular to a plug-in type gas ultrasonic flow meter, which comprises a meter head assembly, a gas flow meter and a gas flow meter, the fixed support is located in the pipeline, and one end of the fixed support is fixedly connected with the meter head assembly; the probe assembly is fixedly arranged on the fixed support and is positioned at one end far away from the meter head assembly; wherein the fixed support is fusiform, and the fusiform is parallel to the flowing direction of gas in the pipeline. According to the utility model, the fixed support is designed to be fusiform, and the shape characteristic of the fusiform fixed support enables the fusiform fixed support to be parallel to the flowing direction of gas in the pipeline. The design is helpful for reducing flow field interference and improving the accuracy of flow velocity measurement, especially in the face of complex flow. The fusiform fixed support can optimize airflow distribution and reduce the influence on ultrasonic propagation, so that the interference of non-ideal flow on the measurement precision is reduced, and a high-precision flow measurement result can be provided under a complex working condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to flowmeter technical field especially relates to a plug-in type gas ultrasonic flowmeter. BACKGROUND

[0002] With the rapid development of domestic natural gas market, in its gas measurement, survey, trade, ultrasonic flowmeter compared with other types of flowmeter, due to have high precision, wide measuring range, good repeatability, no movable parts, suitable for high pressure large pipe diameter, large flow characteristics, has gradually become the preferred flowmeter type in natural gas industry.

[0003] According to the principle of signal detection, ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam offset method, Doppler method, cross correlation method, space filter method and noise method etc. Among them, the most widely used is the ultrasonic flowmeter based on time difference method, the working principle of time difference method ultrasonic flowmeter is to obtain the flow velocity according to the relationship between the transit time difference of ultrasonic beam in the gas and the measured fluid flow, and then the volume flow of the measured gas is converted according to the cross section area of the pipeline.

[0004] And ultrasonic flowmeter is very sensitive to non ideal flow interference in principle, in the actual pipeline, due to the existence of various types of flow resistance, the non ideal flow environment disturbance, the flow appears various flow pattern changes, such as secondary flow disturbance. The radial component of the flow velocity perpendicular to the axis direction in the disturbance is the main factor affecting the accuracy of ultrasonic flowmeter, the asymmetric flow field distribution and the radial component of the flow velocity change the direction and speed of ultrasonic propagation, and then affect the measurement of transit time and thus affect the measurement accuracy.

[0005] In the prior art, ultrasonic flowmeter installs ultrasonic probe through support, and the support usually adopts circular or approximately rectangular structure, the above structure will have great influence on the flow field near the probe, and the generated turbulence will affect the measurement performance of ultrasonic flowmeter.

[0006] The information disclosed in this background section is intended only to enhance understanding of the general background of the present utility model, and should not be construed as acknowledging or implying in any form that this information constitutes prior art to the present utility model known to those skilled in the art. UTILITY MODEL CONTENT

[0007] The utility model provides a kind of plug-in type gas ultrasonic flowmeter, to effectively solve the problems in background art.

[0008] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0009] A table head assembly is fixedly arranged on the outer wall of the pipeline;

[0010] A fixed support is arranged in the pipeline, and one end of the fixed support is fixedly connected with the table head assembly;

[0011] A probe assembly is fixedly arranged on the fixed support and located at an end away from the table head assembly;

[0012] The fixed support is in the shape of a shuttle, and the shuttle is parallel to the direction of gas flow in the pipeline.

[0013] Further, the probe assembly comprises:

[0014] Two ultrasonic transducers are fixedly arranged on the fixed support, and the two ultrasonic transducers are symmetrically arranged and are at a set angle with respect to the axis of the pipeline.

[0015] A reflecting plate is fixedly arranged on the fixed support, and the reflecting plate comprises a reflecting surface, the reflecting surface is parallel to the axis of the pipeline, and the reflecting surface and the two ultrasonic transducers comprise a flow-through space therebetween.

[0016] Further, the reflecting plate is in the shape of a U and comprises two fixed ends, the two fixed ends are fixedly connected with the fixed support and are perpendicular to the reflecting surface, and the flow-through space is formed between the two fixed ends and the reflecting surface.

[0017] Further, the fixed support is provided with two accommodating holes, and the two ultrasonic transducers are fixedly arranged in the accommodating holes.

[0018] Further, the fixed support is provided with two grooves at two ends perpendicular to the axis of the pipeline, and the two fixed ends are fixedly arranged in the two grooves, respectively.

[0019] Further, the fixed support and the table head assembly further comprise a plurality of shuttle-shaped gaskets, the shuttle-shaped gaskets have the same shape as the fixed support, and by arranging different numbers of the shuttle-shaped gaskets, the position of the probe assembly in the pipeline is adjusted.

[0020] Further, the shuttle-shaped gaskets are provided with annular sealing grooves, and the annular sealing grooves are provided with sealing rings.

[0021] Further, two groups of temperature sensors and pressure sensors are arranged on the pipeline and are arranged along the axis of the pipeline, and the two groups of temperature sensors and pressure sensors are symmetrically arranged with respect to the probe assembly.

[0022] The utility model discloses a beneficial effect is: through the fixed support is designed to shuttle shape, its shape feature makes it can with pipeline internal gas flow direction parallel. Such design helps to reduce flow field interference, improves the accuracy of flow speed measurement, especially when facing complex flow. The fixed support of shuttle shape can optimize airflow distribution, reduce the influence to ultrasonic wave propagation, thereby reduce the interference of non-ideal flow to the measurement accuracy, and can ensure that under complex working condition provides high-precision flow measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to be used in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments in the utility model are recorded, for the ordinary skilled person in the art comes, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0024] Figure 1 It is the structural schematic diagram of the utility model;

[0025] Figure 2 It is the structural schematic diagram of fixed support and probe assembly;

[0026] Figure 3 It is the structural schematic diagram of fixed support and ultrasonic transducer;

[0027] Figure 4 It is Figure 3 the sectional view of;

[0028] Figure 5 It is the structural schematic diagram of fixed support and shuttle-shaped gasket. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment.

[0030] As Figures 1 to 5 shown: a plug-in type gas ultrasonic flowmeter, comprising the following steps:

[0031] Meter head assembly 1, meter head assembly 1 is fixedly arranged on the pipeline outer wall;

[0032] Fixed support 2, fixed support 2 is located in the pipeline, and one end is fixedly connected with meter head assembly 1;

[0033] Probe assembly 3, probe assembly 3 is fixedly arranged on fixed support 2, and is located at the end away from meter head assembly 1;

[0034] The fixed support 2 is in the shape of a shuttle, and the shuttle is parallel to the direction of gas flow in the pipeline.

[0035] By designing the fixed support 2 in the shape of a shuttle, the shape feature makes it parallel to the direction of gas flow in the pipeline. Such design helps to reduce flow field interference and improve the accuracy of flow rate measurement, especially in the face of complex flow. The shuttle-shaped fixed support 2 can optimize the airflow distribution, reduce the influence on ultrasonic wave propagation, thereby reducing the interference of non-ideal flow on measurement accuracy, and can ensure to provide high-precision flow measurement results under complex working conditions.

[0036] In this embodiment, the probe assembly 3 comprises:

[0037] Two ultrasonic transducers 31 are fixedly arranged on the fixed support 2, and the two ultrasonic transducers 31 are symmetrically arranged, and the two ultrasonic transducers 31 are at a set angle with respect to the axis perpendicular to the pipeline.

[0038] A reflecting plate 32 is fixedly arranged on the fixed support 2, and the reflecting plate 32 comprises a reflecting surface 321, which is parallel to the pipeline axis, and the reflecting surface 321 and the two ultrasonic transducers 31 comprise a flow-through space therebetween.

[0039] The two transducers emit ultrasonic signals at a set angle, and the signals are reflected by the reflecting plate 32 back to the other transducer during propagation. This design makes the ultrasonic wave path longer in the fluid, thereby increasing the time resolution of the measurement and helping to improve the accuracy of flow rate calculation. The flow-through space between the reflecting plate 32 and the transducer ensures uniform flow of the fluid in the measurement area, minimizing the influence of flow field interference. Based on the difference in transit time of ultrasonic waves in the downstream and upstream directions, the flow rate of the fluid is calculated, and then the volumetric flow rate is obtained by combining the pipeline cross-sectional area.

[0040] The reflecting plate 32 is in a U-shaped structure, comprising two fixed ends 322, which are fixedly connected to the fixed support 2 and are perpendicular to the reflecting surface 321, and the flow-through space is formed between the two fixed ends 322 and the reflecting surface 321.

[0041] The ultrasonic transducers 31 emit signals at a set angle, and the signals pass through the fluid, reach the reflecting surface 321 and are reflected by the reflecting plate 32. The reflected signals pass through the flow-through space and return to the other transducer, completing the reception of the signals. The two ultrasonic wave propagation paths are downstream and upstream, respectively, and the flow rate is calculated using the difference in transit time. The U-shaped reflecting plate 32 is firmly connected to the fixed support 2 by the two fixed ends 322, avoiding displacement or deformation due to vibration or fluid impact during long-term use. The flow-through space design can effectively guide the gas flow, making the airflow distribution more uniform in the area of the reflecting surface 321, reducing the interference of turbulent flow and radial components on the ultrasonic signals.

[0042] As a preferred embodiment of the above-mentioned embodiment, two accommodating holes 21 are arranged on the fixed support 2, and the two ultrasonic transducers 31 are fixedly arranged in the accommodating holes 21.

[0043] The accurate positioning of the ultrasonic transducers 31 through the accommodating holes 21 ensures that the ultrasonic signal path emitted and received by the ultrasonic transducers 31 meets the design requirements, and the stable installation of the accommodating holes 21 avoids the deviation of the transducers due to vibration or airflow impact, thereby improving the repeatability of the signal.

[0044] In the embodiment, the fixed support 2 is provided with two grooves 22 at two ends perpendicular to the pipeline axis, and the two fixed ends 322 are fixed at the two grooves 22, respectively.

[0045] The reflection plate 32 is embedded in the groove 22 of the fixed support 2, so that the entire probe assembly 3 is more streamlined, and the interference with the gas flow in the pipeline is reduced.

[0046] In the embodiment, the fixed support 2 and the meter assembly 1 further include a plurality of shuttle-shaped gaskets 4, the shuttle-shaped gaskets 4 have the same shape as the fixed support 2, and by arranging different numbers of shuttle-shaped gaskets 4, the position of the probe assembly 3 in the pipeline can be adjusted.

[0047] The shuttle-shaped gaskets 4 have the same shape as the fixed support 2 and are designed to be streamlined, which can reduce airflow interference. By adjusting the thickness and number of the gaskets, the probe assembly 3 (including the ultrasonic transducers 31 and the reflection plate 32) can be accurately positioned at the best measurement position in the pipeline, ensuring that the signal receiving and transmission effect is optimal. By adjusting the number of the shuttle-shaped gaskets 4, the position of the probe assembly 3 can be flexibly adjusted, so that the same type of flowmeter can be adapted to pipelines with different diameters or flow rates. The shuttle-shaped gaskets 4 have the same shape as the fixed support 2 and are parallel to the airflow direction, which reduces the resistance of the fluid in the pipeline and reduces the interference with the measurement environment.

[0048] In the embodiment, the shuttle-shaped gaskets 4 are provided with annular sealing grooves 41, and sealing rings are arranged in the annular sealing grooves 41. The design of the annular sealing grooves 41 on the shuttle-shaped gaskets 4 and the embedded sealing rings significantly enhances the sealing performance and environmental adaptability of the plug-in gas ultrasonic flowmeter.

[0049] In the embodiment, two groups of temperature sensors 11 and pressure sensors 12 are further included, the two groups of temperature sensors 11 and pressure sensors 12 are arranged on the pipeline and arranged along the pipeline axis direction, and the two groups of temperature sensors 11 and pressure sensors 12 are symmetrically arranged about the probe assembly 3.

[0050] The data collected by the two groups of sensors are transmitted to the meter head assembly 1 of the ultrasonic flowmeter in real time, the temperature and pressure data are analyzed by the built-in processing module and used for flow calculation correction, the density of the gas is dynamically corrected by acquiring the temperature and pressure data, so as to compensate the influence of working condition change on ultrasonic wave propagation time and measurement result, based on the joint calculation of the temperature, pressure data and ultrasonic flowmeter detection result, more accurate volume flow or flow value under standard state is output.

[0051] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. The meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0054] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the ordinary skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An insertion-type ultrasonic gas flow meter, characterized in that, include: Meter head assembly, the meter head assembly being fixedly mounted on the outer wall of the pipe; A fixed support is located inside the pipe, and one end of the fixed support is fixedly connected to the meter assembly; A probe assembly, which is fixedly mounted on the fixed support and located at the end away from the meter head assembly; The fixed support is spindle-shaped and parallel to the gas flow direction inside the pipe.

2. The insertion-type ultrasonic gas flow meter according to claim 1, characterized in that, The probe assembly includes: Two ultrasonic transducers are fixedly mounted on the fixed support and are symmetrically arranged. The two ultrasonic transducers are at a set angle about the axis of the pipe. A reflector plate is fixedly mounted on the fixed support. The reflector plate includes a reflective surface that is parallel to the pipe axis, and a flow space is provided between the reflective surface and the two ultrasonic transducers.

3. The insertion-type ultrasonic gas flow meter according to claim 2, characterized in that, The reflector has a U-shaped structure, including two fixed ends. The two fixed ends are fixedly connected to the fixed support and are perpendicular to the reflective surface. The two fixed ends and the reflective surface form the flow space.

4. The insertion-type ultrasonic gas flow meter according to claim 3, characterized in that, The fixed support is provided with two receiving holes, and the two ultrasonic transducers are fixedly installed in the receiving holes.

5. The insertion-type ultrasonic gas flow meter according to claim 3, characterized in that, The fixed support has two grooves at both ends perpendicular to the pipe axis, and the two fixed ends are respectively fixed to the two grooves.

6. The insertion-type ultrasonic gas flow meter according to claim 1, characterized in that, The fixed support and the meter assembly also include several shuttle-shaped gaskets. The shuttle-shaped gaskets have the same shape as the fixed support. By setting different numbers of the shuttle-shaped gaskets, the position of the probe assembly in the pipeline can be adjusted.

7. The insertion-type ultrasonic gas flow meter according to claim 6, characterized in that, The spindle-shaped gasket is provided with an annular sealing groove, and a sealing ring is provided inside the annular sealing groove.

8. The insertion-type ultrasonic gas flow meter according to claim 1, characterized in that, It also includes two sets of temperature sensors and pressure sensors, which are installed on the pipeline and arranged along the pipeline axis. The two sets of temperature sensors and pressure sensors are symmetrically arranged about the probe assembly.

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