Gas ultrasonic flowmeter

Abstract

The utility model provides a gas ultrasonic flowmeter which comprises a companion flange, a first front straight pipe section and a rectifier. The companion flange is connected with a first front straight pipe section, the first front straight pipe section is connected with a second front straight pipe section through a rectifier, the second front straight pipe section is connected with a rear straight pipe section through a flowmeter, and an integrated honeycomb rectification flow guide assembly is arranged in a pipeline of the flowmeter. The integrated honeycomb rectification flow guide assembly is composed of a honeycomb rectification flow guide pipe, rectification honeycomb holes and a micropore rectification grid multilayer structure, vortex and velocity distortion can be efficiently eliminated, and the stability of a flow field is remarkably improved. Ultrasonic transducer probes are arranged in the front straight pipe section and the rear straight pipe section, and high-precision temperature and pressure compensation metering is achieved in combination with a flow totalizer, a pressure transmitter and a temperature transmitter. According to the utility model, the dependence on the length of an upstream straight pipe section is effectively reduced, and the measurement accuracy under a low-flow-speed working condition is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to flowmeter field, specifically, relate to a kind of gas ultrasonic flowmeter. BACKGROUND

[0002] As a kind of non-invasive, high-precision flow measuring instrument without moving parts, gas ultrasonic flowmeter has been widely used in natural gas trade settlement, industrial process control and energy management.

[0003] The utility model discloses a kind of gas ultrasonic flowmeters of Chinese utility model patent application number: CN210862799U, including pipe body, mounting structure, rectifier structure, filter structure and connecting structure, pipe body is stainless steel pipe body, two symmetrical distribution installation holes are cooperatively arranged on the wall of pipe body, mounting structure is cooperatively arranged in the installation hole of pipe body wall body corresponding place, ultrasonic transducer group is cooperatively installed in the inside of mounting structure, two ultrasonic transducer groups are cooperatively distributed symmetrically, rectifier structure is cooperatively arranged in the inside two sides of pipe body, the gas ultrasonic flowmeter, realize the quick installation of equipment accessory Fixed, it is convenient to disassemble and maintain simultaneously, two sides do not divide into gas end, ensure the convenience of installation, can be quickly and closely connected with external pipeline installation.

[0004] Gas ultrasonic flowmeter is mainly based on the characteristics of ultrasonic wave propagation in gas medium to measure flow. Its core principle is to use the time difference of ultrasonic wave propagation in the direction of flow and counter flow to calculate the flow rate of gas, and then get the flow rate; But there are still some deficiencies in the use of existing gas ultrasonic flowmeter, which still needs to be improved. In actual engineering application, the measurement accuracy of gas ultrasonic flowmeter is highly dependent on the stability of flow field in pipeline. The measured gas is required to be fully developed axisymmetric laminar flow or turbulent flow, and the velocity distribution is uniform. But the field conditions are often complex and changeable, there are often elbow, valve, tee, variable diameter pipe disturbance elements in the upstream, which leads to vortex, deflection or velocity profile distortion of gas flow. It will significantly affect the accuracy of ultrasonic wave propagation path and time difference, thereby introducing a non-negligible measurement error, especially under low flow rate or small flow rate conditions. Therefore, this paper makes improvement and puts forward a kind of gas ultrasonic flowmeter. UTILITY MODEL CONTENTS

[0005] The utility model aims at: the problem existing in the background art at present. In order to realize the above-mentioned utility model purpose, the utility model provides the following technical scheme: a kind of gas ultrasonic flowmeter, including matching flange, the matching flange is connected with first front straight pipe section, the first front straight pipe section is connected with second front straight pipe section by rectifier, the second front straight pipe section is connected with rear straight pipe section by flowmeter, integrated honeycomb rectifier flow guide assembly is arranged in the pipeline of flowmeter.

[0006] The integrated honeycomb rectification flow guide assembly comprises a honeycomb rectification flow guide pipe, a rectification honeycomb hole, a honeycomb channel inner wall hole, a honeycomb structure support ring, a micropore rectification grille and a rectification cavity inner bushing.

[0007] The rectification honeycomb hole is internally provided with the honeycomb channel inner wall hole, the inner side of the honeycomb channel inner wall hole is internally provided with the honeycomb structure support ring, the inner side of the honeycomb structure support ring is internally provided with the micropore rectification grille, and the micropore rectification grille is internally provided with the rectification cavity inner bushing.

[0008] The flow meter is connected with the cabinet through an electric wire.

[0009] The cabinet is connected with the pressure transmitter through a circuit.

[0010] The second valve group is connected with the rear straight pipe section.

[0011] The cabinet is connected with the temperature transmitter.

[0012] The temperature transmitter is connected with the rear straight pipe section.

[0013] The first front straight pipe section, the second front straight pipe section and the rear straight pipe section are internally provided with an ultrasonic transducer probe.

[0014] The measurement range of the pressure transmitter is 0-4 MPa.

[0015] Compared with the prior art, the utility model has the advantages that: the utility model discloses an integrated honeycomb rectification flow guide assembly is arranged in the flow meter, and in combination with an upstream rectifier, a rectification structure is formed.

[0016] The utility model discloses a built-in high-efficiency rectification system can actively improve the flow field quality, and the dependence of the utility model on the length of the upstream straight pipe section is significantly reduced.

[0017] The utility model provides a structure schematic drawing, which is matched with a pressure transmitter and a temperature transmitter, and carries out temperature and pressure compensation in real time through a flow totalizer in a cabinet, can accurately calculate gas density, and outputs volume flow or mass flow under standard state, satisfies trade settlement, energy management high requirement application scene. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure schematic drawing is provided for the utility model.

[0019] Figure 2 A rectifier honeycomb hole structure schematic drawing is provided for the utility model.

[0020] Figure 3 An integrated honeycomb rectifier flow guide assembly schematic drawing is provided for the utility model.

[0021] Figure 4 A front view structure schematic drawing is provided for the utility model.

[0022] Figure 5 A rectifier honeycomb hole local structure schematic drawing is provided for the utility model.

[0023] Indicated in the drawing:

[0024] 1, matching flange;2, first front straight pipe section;3, rectifier;4, second front straight pipe section;5, rear straight pipe section;6, flowmeter;7, cabinet;8, flow totalizer;9, pressure transmitter;10, two valve groups;11, temperature transmitter;12, integrated honeycomb rectifier flow guide assembly;1201, honeycomb rectifier flow guide pipe;1202, rectifier honeycomb hole;1203, honeycomb passage inner wall hole;1204, honeycomb structure support ring;1205, micropore rectifier grille;1206, rectifier cavity inner bushing;13, ultrasonic transducer probe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment.

[0026] Therefore, the following detailed description of embodiments of the present application is not intended to limit the scope of the claimed application, but merely to indicate some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict, and attention should be paid to: similar reference numerals and letters represent similar items in the following drawings, so that once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] Embodiment 1: A gas ultrasonic flowmeter, comprising a pair of flanges 1, the pair of flanges 1 is connected with a first front straight pipe section 2, the first front straight pipe section 2 is connected with a second front straight pipe section 4 through a rectifier 3, the second front straight pipe section 4 is connected with a rear straight pipe section 5 through a flowmeter 6, and an integrated honeycomb rectifier flow guide assembly 12 is arranged in a pipeline of the flowmeter 6.

[0028] The integrated honeycomb rectifier flow guide assembly 12 comprises a honeycomb rectifier flow guide pipe 1201, a rectifier honeycomb hole 1202, a honeycomb channel inner wall hole 1203, a honeycomb structure support ring 1204, a microporous rectifier grid 1205 and a rectifier cavity inner sleeve 1206. The rectifier honeycomb hole 1202 is arranged in the honeycomb rectifier flow guide pipe 1201, the inner side of the rectifier honeycomb hole 1202 is provided with the honeycomb channel inner wall hole 1203, the inner side of the honeycomb channel inner wall hole 1203 is provided with the honeycomb structure support ring 1204, the inner side of the honeycomb structure support ring 1204 is provided with the microporous rectifier grid 1205, and the microporous rectifier grid 1205 is provided with the rectifier cavity inner sleeve 1206.

[0029] The flowmeter 6 is connected with a cabinet 7 through wires, and a flow totalizer 8 is arranged in the cabinet 7. The cabinet 7 is connected with a pressure transmitter 9 through a line, the pressure transmitter 9 is connected with a two-valve group 10. The two-valve group 10 is connected with the rear straight pipe section 5. The cabinet 7 is connected with a temperature transmitter 11. The temperature transmitter 11 is connected with the pipeline of the rear straight pipe section 5. Ultrasonic transducer probes 13 are arranged in the first front straight pipe section 2, the second front straight pipe section 4 and the rear straight pipe section 5. The measurement range of the pressure transmitter 9 is 0-4 MPa.

[0030] The working principle of the gas ultrasonic flowmeter is as follows: the measured gas enters the first front straight pipe section 2 from the upstream pipeline through the pair of flanges 1. Since there are often elbows, valve disturbance elements in the field working condition, the gas flow often has vortex, deflection or velocity profile distortion when entering the measurement section, which seriously affects the measurement accuracy. Therefore, the rectifier 3 is arranged between the first front straight pipe section 2 and the second front straight pipe section 4, which is used to preliminarily eliminate large-scale flow disturbance.

[0031] Subsequently, the gas enters the second front straight pipe section 4 and flows through the measuring chamber of the flowmeter 6. At the core of the flowmeter 6, an integrated honeycomb rectifying and guiding assembly 12 is installed, which is a key structure for improving flow field stability. The integrated honeycomb rectifying and guiding assembly 12 consists of multiple layers of synergistic rectifying units: the outermost layer is a honeycomb rectifying and guiding pipe 1201, inside which are regularly arranged rectifying honeycomb holes 1202, which can divide the main flow into multiple parallel sub-channels, effectively suppressing lateral flow and vortices; the inner side of the rectifying honeycomb holes 1202 is provided with honeycomb channel inner wall holes 1203, further refining the flow channel and enhancing the rectification effect; further inwards, a honeycomb structure support ring 1204, a microporous rectifying grid 1205, and a rectifying cavity inner bushing 1206 are sequentially arranged. Among them, the microporous rectifier grid 1205 finely homogenizes the airflow through a high-density microporous structure, while the rectifier cavity bushing 1206 provides a smooth, low-disturbance inner wall surface, together ensuring that the airflow entering the ultrasonic measurement area reaches an ideal state of full development, axisymmetry and uniform velocity distribution.

[0032] Under highly stable flow field conditions, ultrasonic transducer probes 13 installed in the first front straight pipe section 2, the second front straight pipe section 4, and the rear straight pipe section 5 emit and receive ultrasonic signals. The ultrasonic waves propagate in both the forward and reverse directions, creating a time difference due to gas flow; this time difference is linearly related to the gas velocity. Flowmeter 6 collects the time difference signals from each channel and transmits them via wires to the flow totalizer 8 inside the cabinet 7. The flow totalizer 8 calculates the volumetric flow rate in real time based on a multi-channel data fusion algorithm and, combined with temperature and pressure compensation, achieves high-precision mass flow rate output.

[0033] To achieve temperature and pressure compensation, the system also integrates a pressure transmitter 9 and a temperature transmitter 11. The pressure transmitter 9 is connected to the downstream straight pipe section 5 via a two-valve manifold 10, and can accurately measure the gas pressure in the pipeline within the range of 0–4 MPa; the temperature transmitter 11 is directly connected to the downstream straight pipe section 5 to obtain the gas temperature in real time. Both signals are transmitted to the cabinet 7 via lines for the flow totalizer 8 to perform real-time density correction and flow compensation.

[0034] The working process of the ultrasonic gas flow meter: The gas to be measured enters the first upstream straight pipe section 2 from the upstream pipeline through the mating flange 1. Due to the presence of bends, valves, and variable diameter disturbance elements in the pipeline, the airflow usually exhibits vortices, flow deviation, or uneven velocity distribution, resulting in a non-ideal flow state. To improve the flow field, the gas then flows through the rectifier 3, which initially suppresses large-scale flow disturbances, making the airflow tend to be stable.

[0035] After initial rectification, the gas enters the second upstream straight pipe section 4 and flows into the measuring pipe section of the flow meter 6. Inside the flow meter 6, the gas undergoes further rectification through the integrated honeycomb rectifier and guide assembly 12. This assembly consists of a multi-layered structure working synergistically.

[0036] The gas first enters the honeycomb rectifying flow guide pipe 1201 and is divided into multiple parallel sub-paths; the flow direction is further constrained through the rectifying honeycomb holes 1202; the honeycomb path inner wall holes 1203 refine the flow path boundary and reduce edge disturbance; the honeycomb structure support ring 1204 provides mechanical strength and maintains the consistency of the path geometry; the micro-hole rectifying grid 1205 homogenizes the airflow with high precision and eliminates micro eddies; finally, the rectifying cavity inner sleeve 1206 provides a smooth inner wall to ensure that the airflow enters the ultrasonic measurement area in a fully developed, axisymmetric and uniformly distributed state.

[0037] Under the condition of high stability of the flow field, the ultrasonic transducer probes 13 arranged in the first front straight pipe section 2, the second front straight pipe section 4 and the rear straight pipe section 5 start to work. Each probe is arranged in pairs and alternately emits and receives ultrasonic signals along different sound channels. The ultrasonic wave propagates in the downstream direction for a short time, and in the upstream direction for a long time, and the time difference between the two is proportional to the gas flow rate.

[0038] The ultrasonic transducer probes 13 transmit the collected time difference signals to the flow totalizer 8 in the cabinet 7 through the cable. The flow totalizer 8 calculates the linear average flow rate of the gas in real time based on the multi-channel time difference method and in combination with the sound channel geometric parameters, and integrates to obtain the volume flow.

[0039] In order to improve the measurement accuracy, the system synchronously collects temperature and pressure parameters: the pressure transmitter 9 is connected to the rear straight pipe section 5 through the two-valve group 10, and measures the gas pressure in the pipeline in real time, with a measurement range of 0-4 MPa; the temperature transmitter 11 is directly installed on the rear straight pipe section 5 to obtain the real-time temperature of the gas; the signals of the two are transmitted into the cabinet 7 through the line, for the flow totalizer 8 to calculate the gas density and perform temperature and pressure compensation, and finally output the mass flow or energy flow under standard conditions.

[0040] The above embodiments are only used to illustrate the technical solutions described in the present application and do not limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments, and therefore any modification or replacement of the present application; all technical solutions and improvements that do not deviate from the spirit and scope of the application are included in the scope of the claims of the present application.

Claims

1. A gas ultrasonic flow meter comprising a pair of flanges (1), characterized in that, The matching flange (1) is connected with the first front straight pipe section (2), the first front straight pipe section (2) is connected with the second front straight pipe section (4) through the rectifier (3), the second front straight pipe section (4) is connected with the rear straight pipe section (5) through the flow meter (6), and the pipeline of the flow meter (6) is provided with an integrated honeycomb rectifier flow guide assembly (12).

2. A gas ultrasonic flow meter according to claim 1, wherein The integrated honeycomb rectifier flow guide assembly (12) comprises a honeycomb rectifier flow guide pipe (1201), a rectifier honeycomb hole (1202), a honeycomb channel inner wall hole (1203), a honeycomb structure support ring (1204), a microporous rectifier grille (1205) and a rectifier cavity inner bushing (1206).

3. A gas ultrasonic flow meter according to claim 2, wherein The honeycomb rectifier flow guide pipe (1201) is provided with the rectifier honeycomb hole (1202), the inner side of the rectifier honeycomb hole (1202) is provided with the honeycomb channel inner wall hole (1203), the inner side of the honeycomb channel inner wall hole (1203) is provided with the honeycomb structure support ring (1204), the inner side of the honeycomb structure support ring (1204) is provided with the microporous rectifier grille (1205), and the microporous rectifier grille (1205) is provided with the rectifier cavity inner bushing (1206).

4. A gas ultrasonic flow meter according to claim 3, wherein The flow meter (6) is connected with the cabinet (7) through wires, and the cabinet (7) is provided with a flow totalizer (8).

5. A gas ultrasonic flow meter according to claim 4, wherein The cabinet (7) is connected with the pressure transmitter (9) through a line, and the pressure transmitter (9) is connected with the two valve groups (10).

6. A gas ultrasonic flow meter according to claim 5, wherein The two valve groups (10) are connected with the rear straight pipe section (5).

7. A gas ultrasonic flow meter according to claim 6, wherein The cabinet (7) is connected with the temperature transmitter (11).

8. A gas ultrasonic flow meter according to claim 7, wherein The temperature transmitter (11) is connected with the pipeline of the rear straight pipe section (5).

9. A gas ultrasonic flow meter according to claim 8, wherein, The first front straight pipe section (2), the second front straight pipe section (4) and the rear straight pipe section (5) are provided with ultrasonic transducer probes (13).

10. A gas ultrasonic flow meter according to claim 9, wherein The measurement range of the pressure transmitter (9) is 0-4MPa.

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