Front flow adjusting device of gas ultrasonic flowmeter

Abstract

The utility model discloses a front flow adjusting device of a gas ultrasonic flowmeter, and relates to the technical field of measurement and control instruments. Connecting flanges are respectively arranged at a gas inlet and a gas outlet of a shell; a rectifying module is arranged on the inner side of one end of the gas inlet of the shell, a shunting module is arranged on the inner side of the rectifying module, a plurality of shunting ports are formed in the circumferential direction of the shunting module, a first adjusting module is arranged on the inner side of one end of the gas outlet of the shell, and a plurality of first gas outlets are formed in the first adjusting module. The distribution and the flow velocity of the airflow before entering the gas ultrasonic flowmeter are readjusted, the possibility that the airflow fluctuates and vortexes is greatly reduced, the flow velocity of the airflow after passing through the flow adjusting device is uniform and stable, and the defect that the measurement of the gas ultrasonic flowmeter is inaccurate or the gas ultrasonic flowmeter stops working due to noise interference is overcome. The ultrasonic flowmeter is high in measurement precision, small in error and high in anti-interference capability.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring and controlling instruments, in particular to a pre-flow regulating device for a gas ultrasonic flow meter. Background Art

[0002] The application of ultrasonic flowmeters is no longer unfamiliar after decades of development, especially in the field of natural gas measurement. Based on the accumulation of actual operating experience and big data analysis, different types of flow adjustment devices have emerged in an endless stream. The ultimate goal is to reduce the noise and turbulence caused by different environmental factors, thereby improving the measurement accuracy of ultrasonic flowmeters.

[0003] According to the current application of natural gas market, the ultrasonic flow meter and the flow adjustment device equipped have the following shortcomings:

[0004] 1. In practical applications, gas ultrasonic flowmeters and the flow adjustment devices they are equipped with are often used at the position of medium and low pressure conversion, that is, they are used after pressure regulation. The pressure regulating device is a pressure reducing valve. When the pressure reducing valve reduces the pressure, it will generate mechanical vibration and a certain mechanical frequency. The mechanical frequency will affect the normal measurement of the ultrasonic flowmeter and cause deviations in its accuracy, resulting in inaccurate measurement.

[0005] 2. In addition, the upstream valves (half-open or different degrees of gate valves, butterfly valves), 90° elbows, 90° elbows in different planes, etc. will have different degrees of influence on the flowing airflow, resulting in inaccurate measurement.

[0006] 3. The existing flow adjustment device can reduce noise and stabilize airflow to a certain extent. However, impurities or dust in the natural gas medium will accumulate over time and gradually adhere to the inner wall of the flow adjustment device, causing the flow inlets to shrink, thereby reducing the flow rate, and ultimately leading to inaccurate metering or, in severe cases, the inability to measure normally. Summary of the invention

[0007] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a pre-flow adjustment device for a gas ultrasonic flowmeter is provided, so that the gas flow rate entering the ultrasonic flowmeter is uniform and stable, and the ultrasonic flowmeter has high measurement accuracy, small error and strong anti-interference ability.

[0008] In order to solve the above technical problems, the technical solution of the utility model is:

[0009] A gas ultrasonic flow meter front flow adjustment device comprises a shell, two ends of the shell are respectively provided with a gas inlet and a gas outlet, and the shell is respectively provided with connecting flanges at the gas inlet and the gas outlet;

[0010] The shell is provided with a rectifier module on the inner side of one end of the gas inlet, a diverter module is provided on the inner side of the rectifier module, a plurality of diverter ports are provided in the circumference of the diverter module, and the shell is provided with a first adjustment module on the inner side of one end of the gas outlet, and the first adjustment module is provided with a plurality of first gas outlet holes.

[0011] As an improved technical solution, the two connecting flanges are connected to the shell through threads.

[0012] As an improved technical solution, a conical flow guide module is provided at one inner end of the diversion module.

[0013] As an improved technical solution, a second adjustment module is provided inside the first adjustment module, and the second adjustment module is provided with a plurality of second air outlet holes.

[0014] As an improved technical solution, a plurality of the first air outlet holes and the second air outlet holes are staggered along the axial direction of the shell.

[0015] As an improved technical solution, an airflow buffer channel is provided between an outer end of the rectifier module and an outer wall of the connecting flange.

[0016] As a preferred technical solution, a first buffer air chamber is provided between the rectifying module and the diverting module.

[0017] As a preferred technical solution, a second buffer air chamber is provided between the diversion module and the second adjustment module.

[0018] As a preferred technical solution, a third buffer air chamber is provided between the first adjustment module and the second adjustment module.

[0019] As a preferred technical solution, a plurality of partitions are provided in the rectifier module, and the plurality of partitions divide the rectifier module into a plurality of honeycomb-shaped rectifier cavities.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] The utility model discloses a pre-flow adjustment device for a gas ultrasonic flowmeter, comprising a shell, wherein the two ends of the shell are respectively provided with a gas inlet and a gas outlet, and the shell is respectively provided with connecting flanges at the gas inlet and the gas outlet; the shell is provided with a rectifier module on the inner side of one end of the gas inlet, and a diverter module is provided on the inner side of the rectifier module, and the diverter module is provided with a plurality of diverter ports in the circumference, and the shell is provided with a first adjustment module on the inner side of one end of the gas outlet, and the first adjustment module is provided with a plurality of first air outlets. Through the joint action of the rectifier module, the diverter module and the first adjustment module, the distribution and flow velocity of the airflow before entering the gas ultrasonic flowmeter are readjusted, which greatly reduces the possibility of fluctuation and vortex of the airflow, and the flow velocity of the airflow after passing through the flow adjustment device is uniform and stable, which overcomes the defect that the gas ultrasonic flowmeter is inaccurately measured or stops working due to noise interference, and the ultrasonic flowmeter has high measurement accuracy, small error and strong anti-interference ability.

[0022] The two connecting flanges of the utility model are connected to the shell through threads, which is convenient for disassembly and assembly, and is convenient for replacing damaged connecting flanges, thereby reducing maintenance and use costs.

[0023] A conical flow guide module is provided at one inner end of the flow diversion module to adjust the direction of the airflow so that the airflow can enter the first adjustment module more smoothly and stably.

[0024] A second adjustment module is provided inside the first adjustment module, and the second adjustment module is provided with a plurality of second air outlets. The airflow reaches the second adjustment module after passing through the flow guide module, flows out from the second air outlets and reaches the first adjustment module, and finally flows out from the first air outlets and enters the flow meter. After two adjustments, the gas flow rate entering the flow meter is more uniform and stable, which helps to improve the measurement accuracy of the flow meter.

[0025] The first air outlet holes and the second air outlet holes are staggered along the axial direction of the shell, so that the buffering effect of the airflow at the first adjustment module and the second adjustment module is better, and the flow rate of the gas is more stable.

[0026] An airflow buffer channel is provided between the outer end of the rectifier module and the outer wall of the connecting flange to reduce the vortex and turbulence of the airflow and help improve the stability of the gas.

[0027] A first buffer air chamber is provided between the rectifying module and the diverting module, a second buffer air chamber is provided between the diverting module and the second adjusting module, and a third buffer air chamber is provided between the first adjusting module and the second adjusting module. The gas passes through the first buffer air chamber, the second buffer air chamber and the third buffer air chamber, and the flow velocity is more stable, which helps to improve the measurement accuracy of the flow meter.

[0028] A plurality of partitions are arranged in the rectifier module, and the plurality of partitions divide the rectifier module into honeycomb-shaped rectifier chambers, which have a good gas diversion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0031] Figure 2 yes Figure 1 The structural diagram of the rectifier module;

[0032] Figure 3 yes Figure 1 The structural diagram of the middle diversion module;

[0033] Figure 4 yes Figure 1 A structural diagram of the first adjustment module;

[0034] Among them: 1. Shell; 2. Gas inlet; 3. Gas outlet; 4. Connecting flange; 5. Rectification module; 6. Diversion module; 7. Diversion port; 8. First adjustment module; 9. First air outlet; 10. Guide module; 11. Second adjustment module; 12. Second air outlet; 13. Air flow buffer channel; 14. First buffer air chamber; 15. Second buffer air chamber; 16. Third buffer air chamber; 17. Partition; 18. Rectification cavity. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] like Figure 1-4 As shown, a pre-flow adjustment device for a gas ultrasonic flowmeter comprises a shell 1, wherein a gas inlet 2 and a gas outlet 3 are respectively arranged at both ends of the shell 1, and a connecting flange 4 is respectively arranged at the gas inlet 2 and the gas outlet 3; the shell 1 is provided with a rectifier module 5 on the inner side of one end of the gas inlet 2, and a flow splitter module 6 is arranged on the inner side of the rectifier module 5, and a plurality of flow splitters 7 are arranged in the circumferential direction of the flow splitter module 6; the shell 1 is provided with a first adjustment module 8 on the inner side of one end of the gas outlet 3, and the first adjustment module 8 is provided with a plurality of first air outlets 9. Through the joint action of the rectifier module 5, the flow splitter module 6 and the first adjustment module 8, the distribution and flow velocity of the airflow before entering the gas ultrasonic flowmeter are readjusted, which greatly reduces the possibility of fluctuation and vortex of the airflow, and the flow velocity of the airflow after passing through the flow adjustment device is uniform and stable, which overcomes the defect that the gas ultrasonic flowmeter is inaccurately measured or stops working due to noise interference, and the ultrasonic flowmeter has high measurement accuracy, small error and strong anti-interference ability.

[0037] The two connecting flanges 4 are connected to the housing 1 by threads, which is convenient for assembly and disassembly, and it is convenient to replace the damaged connecting flanges 4, thereby reducing the maintenance and use costs.

[0038] A conical flow guiding module 10 is disposed at one inner end of the flow dividing module 6 to adjust the direction of the airflow so that the airflow can enter the first adjusting module 8 more smoothly and stably.

[0039] The second adjustment module 11 is provided inside the first adjustment module 8, and the second adjustment module 11 is provided with a plurality of second air outlets 12. The airflow reaches the second adjustment module 11 after passing through the flow guide module 10, flows out from the second air outlets 12 and reaches the first adjustment module 8, and finally flows out from the first air outlet 9 and enters the flow meter. After two adjustments, the gas flow rate entering the flow meter is more uniform and stable, which helps to improve the measurement accuracy of the flow meter.

[0040] The first air outlet holes 9 and the second air outlet holes 12 are staggered along the axial direction of the housing 1, so that the airflow has a better buffering effect at the first adjustment module 8 and the second adjustment module 11, and the flow rate of the gas is more stable. Figure 4 As shown, in this embodiment, the structures of the first adjustment module 8 and the second adjustment module 11 are exactly the same, wherein the first air outlet 9 at A in the first adjustment module 8 is directly opposite to the second air outlet 12 at B in the second adjustment module 11, that is, the positions of the plurality of second air outlets 12 in the second adjustment module 11 are distributed such that the first adjustment module 8 rotates clockwise to rotate the first air outlet 9 from A to B.

[0041] An airflow buffer channel 13 is provided between the outer end of the rectifier module 5 and the outer wall of the connecting flange 4 to reduce the vortex and turbulence of the airflow and help improve the stability of the gas.

[0042] A first buffer air chamber 14 is provided between the rectifying module 5 and the diverting module 6, a second buffer air chamber 15 is provided between the diverting module 6 and the second adjusting module 11, and a third buffer air chamber 16 is provided between the first adjusting module 8 and the second adjusting module 11. The gas flows through the first buffer air chamber 14, the second buffer air chamber 15 and the third buffer air chamber 16, and the flow velocity is more stable, which helps to improve the measurement accuracy of the flow meter.

[0043] A plurality of partitions 17 are provided in the rectifier module 5, and the plurality of partitions 17 divide the rectifier module 5 into honeycomb-shaped rectifier chambers 18, which have a good gas diversion effect. The rectifier chamber 18 in this embodiment is a hexagonal rectifier chamber 18, and may also be other shapes.

[0044] Six TDS-100 pipe-type ultrasonic flow meters produced by Zibo Watson Measurement and Control Technology Co., Ltd. were selected and numbered 1-6#, and 1-3# were used without the front flow adjustment device of the utility model for the experiment, and 4-6# were used with the front flow adjustment device of the utility model for the experiment, and the following test data were obtained:

[0045] Test data of ultrasonic flowmeter without pre-flow adjustment device - 1# ultrasonic flowmeter:

[0046]

[0047] Test data of ultrasonic flowmeter without pre-flow adjustment device - 2# ultrasonic flowmeter:

[0048]

[0049] Test data of ultrasonic flowmeter without pre-flow adjustment device - 3# ultrasonic flowmeter:

[0050]

[0051] Test data of ultrasonic flowmeter using the pre-flow adjustment device of the embodiment—4# ultrasonic flowmeter:

[0052]

[0053] Test data of ultrasonic flowmeter using the front flow adjustment device of the embodiment - 5# ultrasonic flowmeter:

[0054]

[0055] Test data of ultrasonic flowmeter using the pre-flow adjustment device of the embodiment—6# ultrasonic flowmeter:

[0056]

[0057] The following conclusions can be drawn from the above test data:

[0058] The closer this error value is to the origin (0), the higher the accuracy of the ultrasonic flowmeter and the smaller the measurement error. From the above test data, it can be concluded that the use of the pre-flow adjustment device of the utility model greatly improves the anti-interference ability and measurement accuracy of the ultrasonic flowmeter, which effectively solves the technical problem that the ultrasonic flowmeter in the prior art is affected by the installation conditions and the surrounding environment, resulting in excessive measurement errors and cannot meet the national standard requirements for the measurement error of the ultrasonic flowmeter.

[0059] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A gas ultrasonic flow meter pre-flow adjustment device, comprising a housing, characterized in that: A gas inlet and a gas outlet are respectively provided at both ends of the shell, and the shell is provided with connecting flanges at the gas inlet and the gas outlet respectively; The shell is provided with a rectifier module on the inner side of one end of the gas inlet, a diverter module is provided on the inner side of the rectifier module, a plurality of diverter ports are provided in the circumference of the diverter module, and the shell is provided with a first adjustment module on the inner side of one end of the gas outlet, and the first adjustment module is provided with a plurality of first gas outlet holes.

2. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: The two connecting flanges are connected to the housing via threads.

3. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: A conical flow guiding module is provided at one inner end of the flow diversion module.

4. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: A second adjustment module is disposed inside the first adjustment module, and the second adjustment module is provided with a plurality of second air outlet holes.

5. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 4, characterized in that: A plurality of the first air outlet holes and the second air outlet holes are staggeredly arranged along the axial direction of the shell.

6. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: An airflow buffer channel is provided between an outer end of the rectifier module and an outer wall of the connecting flange.

7. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: A first buffer air chamber is provided between the rectifying module and the diverting module.

8. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 4, characterized in that: A second buffer air chamber is provided between the diversion module and the second adjustment module.

9. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 4, characterized in that: A third buffer air chamber is provided between the first adjustment module and the second adjustment module.

10. A gas ultrasonic flow meter pre-flow adjustment device as claimed in claim 1, characterized in that: A plurality of partitions are arranged in the rectifier module, and the plurality of partitions divide the rectifier module into a plurality of honeycomb-shaped rectifier cavities.

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