Ultrasonic gas meter and ultrasonic measuring pipe section

Abstract

The utility model discloses an ultrasonic gas meter and an ultrasonic measuring pipe section, and relates to the technical field of ultrasonic measurement, the ultrasonic measuring pipe section comprises a measuring pipe, the measuring pipe comprises a first straight pipe section, a bent pipe section and a second straight pipe section which are connected in sequence, one end of the first straight pipe section is a gas outlet, and the other end of the first straight pipe section is fixedly connected with the bent pipe section; according to the ultrasonic gas meter and the ultrasonic measuring pipe section, the problem that pressure is unstable due to the fact that a user at the rear end frequently adjusts the air flow can be solved, the influence of pressure fluctuation is small when small flow is measured, and the measuring accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic measurement, in particular to an ultrasonic gas meter and an ultrasonic measurement pipe section. Background Technique

[0002] The ultrasonic measurement technology is based on the propagation speed of ultrasonic waves in a medium to measure the distance between the emission point and the reception point of an ultrasonic sensor, and people apply it to the measurement of gas or liquid. Ultrasonic flow measurement can use the time difference method principle to measure the flow velocity of the medium, and reflect the flow velocity of the fluid by measuring the difference in the velocities of ultrasonic signals propagating downstream and upstream in the fluid. Because the error caused by the change of the sound speed with the fluid temperature in the time difference method is small and the accuracy is high, it is currently widely used. However, when the medium fluid appears turbulent or eddy current phenomena in the ultrasonic measurement pipeline, there will be certain errors or fluctuations in the difference between the downstream time and the upstream time measured by the ultrasonic sensor, which will lead to inaccurate measurement data of ultrasonic measurement and reduced measurement accuracy.

[0003] After retrieval, the patent number is CN219551594U, which discloses an ultrasonic sensor and an ultrasonic measurement pipe section, including a housing. A piezoelectric wafer is fixed in the housing. The housing includes a mounting bracket. A fixing ring is connected to the periphery of the mounting bracket through a connecting arm. A conical flow guiding cover is buckled on the mounting bracket. The piezoelectric wafer is fixed in the space surrounded by the mounting bracket and the flow guiding cover. The wire of the piezoelectric wafer passes out between the mounting bracket and the flow guiding cover. This ultrasonic sensor and ultrasonic measurement pipe section have high measurement accuracy, can measure tiny flow rates, have good repeatability, and a wide measurement range. However, this ultrasonic sensor and ultrasonic measurement pipe section are installed in the fluid pipeline. During the use of natural gas, due to the instantaneous opening of the gas stove, the pressure in the pipeline will be unbalanced, and the flow field of the gas in the measurement pipe will change suddenly, and it is greatly affected by pressure fluctuations, and the measurement accuracy of small flow rates is low. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an ultrasonic gas meter and an ultrasonic measurement pipe section to overcome the defects of being greatly affected by pressure fluctuations and low measurement accuracy of small flow rates in the existing ones; and achieve the purpose of being less affected by pressure fluctuations and having high measurement accuracy of small flow rates.

[0005] To solve the above technical problems, the technical solution of the utility model is: an ultrasonic measurement pipe section, characterized in that: it includes a measurement pipe, and the measurement pipe includes a first straight pipe section, a bent pipe section and a second straight pipe section connected in sequence. One end of the first straight pipe section is a gas outlet, and the other end is fixedly connected to the bent pipe section. One end of the second straight pipe section is a gas inlet, and the other end is fixedly connected to the bent pipe section.

[0006] Further, an ultrasonic sensor is provided on both sides of the second straight pipe section, and the ultrasonic sensor is inclined.

[0007] Further, the axes of the two ultrasonic sensors are on the same straight line, and the included angle between the axis of the ultrasonic sensor and the axis of the second straight pipe section is 55°.

[0008] An ultrasonic gas meter, characterized in that: it includes a housing, a first buffer gas chamber is provided inside the housing, and an inlet pipe section and a measuring pipe are provided on the housing;

[0009] The top of the inlet pipe section and the gas outlet are arranged outside the housing, the bottom of the inlet pipe section and the gas inlet are arranged inside the housing, and a flow deflecting member is provided at the bottom end of the inlet pipe section.

[0010] Further, the flow deflecting member includes a first flow deflecting component and a second flow deflecting component arranged at the bottom of the first flow deflecting component. The first flow deflecting component includes a first pipe body and a plurality of first flow deflecting vanes vertically arranged uniformly. The first flow deflecting vanes are fixedly arranged inside the first pipe body, and are arranged in parallel between adjacent first flow deflecting vanes;

[0011] The second flow deflecting component includes a second pipe body and a plurality of second flow deflecting vanes arranged obliquely uniformly. The second pipe body is obliquely arranged at the bottom of the first pipe body. The second flow deflecting vanes are fixedly arranged inside the second pipe body, and are arranged in parallel between adjacent second flow deflecting vanes. The included angle between the second flow deflecting vane and the axis is 30°, and the inclination direction of the second flow deflecting vane is away from the measuring pipe. The number of the first flow deflecting vanes is the same as that of the second flow deflecting vanes and they are correspondingly arranged. The top end of the second flow deflecting vane is fixedly arranged at the bottom end of the first flow deflecting vane.

[0012] Further, the space inside the first buffer gas chamber is larger than the spaces inside the inlet pipe section and the flow deflecting member.

[0013] Further, a flow guiding member is provided on the outer periphery of the second straight pipe section. The flow guiding member and the measuring pipe are fixedly arranged inside the housing. A second buffer gas chamber is provided between the flow guiding member and the second straight pipe section. The flow guiding member is a tubular structure with one end closed and one end open. The open end is trumpet-shaped, and the closed end is arc-shaped. Spikes are provided at the closed end inside the flow guiding member. The spikes are conical and are densely and uniformly distributed. The height of the spikes is 5 mm.

[0014] Further, the axis of the inlet pipe section is parallel to the axis of the first straight pipe section;

[0015] The cross-section of the inlet pipe section is circular, and the cross-section of the flow deflecting member is circular.

[0016] Further, the distance between the closed end of the flow guiding member and the gas inlet is 12 mm.

[0017] Further, the bent pipe section faces the inlet pipe section.

[0018] The utility model adopts the above technical solutions and has the following advantages compared with the prior art: When in use, gas enters the gas meter housing through the inlet pipe section. The vertically arranged first deflector and the inclined second deflector in the deflector disperse the gas into multiple strands. The multiple strands of gas enter the first buffer chamber and direct the gas away from the measuring pipe. The space in the first buffer chamber is relatively large, which has a good effect of stabilizing the flow and pressure, and can buffer the sudden drop and increase of gas.

[0019] The gas in the first buffer chamber enters the second buffer chamber along the flow guide. The gas passing through the second buffer chamber will rectify the gas, making the gas flow field stable and the air flow direction consistent. Then the gas passes through the spikes at the bottom of the flow guide. The spikes evenly distribute the gas and at the same time have the function of buffering the air flow and reducing noise. The bottom of the flow guide is arc-shaped, which plays a role in stabilizing the flow. Finally, the gas enters the measuring pipe through the gas inlet, measures the speed of the gas flowing through by the ultrasonic sensor, and calculates the volume of the gas flowing through by the flow rate. The gas is discharged through the gas outlet.

[0020] The gas changes the direction of the original air flow through the deflector, causing the air flow to diffuse locally. Then, through the flow stabilizing effect of the first buffer chamber, the rectifying effect of the flow guide and the flow stabilizing effect of the spikes, the rectifying and pressure stabilizing effects are prominent. At the same time, the included angle between the axis of the ultrasonic sensor and the axis of the second straight pipe section is 55°. The sound path of the ultrasonic sensor increases and the resolution improves, which can cope with the problem of unstable pressure caused by the frequent adjustment of the air flow size by the backend users. It makes the measurement less affected by pressure fluctuations when measuring small flow rates and has high measurement accuracy. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of an ultrasonic gas meter in an embodiment of the utility model;

[0022] Figure 2 It is a schematic structural diagram of the deflector in an embodiment of the utility model;

[0023] Figure 3 It is a side view of the flow guide in an embodiment of the utility model;

[0024] Figure 4 It is a schematic structural diagram of the ultrasonic measuring pipe section in an embodiment of the utility model;

[0025] Figure 5 It is a top view of the ultrasonic measuring pipe section in an embodiment of the utility model.

[0026] In the figure: 1 - housing, 2 - flow deflecting member, 21 - first flow deflecting component, 211 - first flow deflecting plate, 212 - first pipe body, 22 - second flow deflecting component, 221 - second flow deflecting plate, 222 - second pipe body, 3 - flow guiding member, 4 - measuring pipe, 41 - first straight pipe section, 42 - second straight pipe section, 43 - bent pipe section, 44 - gas outlet, 45 - gas inlet, 5 - inlet pipe section, 7 - first buffer air chamber, 8 - second buffer air chamber, 9 - spike, 10 - ultrasonic sensor. Specific embodiments

[0027] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Embodiment 1, as Figures 1-5 shown, an ultrasonic measurement pipe section includes a measuring pipe 4. The measuring pipe 4 includes a first straight pipe section 41, a bent pipe section 43, and a second straight pipe section 42 that are connected in sequence. One end of the first straight pipe section 41 is a gas outlet 44, and the other end is fixedly connected to the bent pipe section 43. One end of the second straight pipe section 42 is a gas inlet 45, and the other end is fixedly connected to the bent pipe section 43.

[0029] On both sides of the second straight pipe section 42, there is one ultrasonic sensor 10 each. One is used as a transmitting end and the other is used as a receiving end. The ultrasonic sensors 10 are inclined. The axes of the two ultrasonic sensors 10 are on the same straight line, and the included angle between the axis of the ultrasonic sensor 10 and the axis of the second straight pipe section 42 is 55°.

[0030] Embodiment 2, as Figures 1-5 shown, an ultrasonic gas meter includes a housing 1. A first buffer air chamber 7 is provided inside the housing 1. An inlet pipe section 5 and the measuring pipe 4 described in Embodiment 1 are provided on the housing 1. The top of the inlet pipe section 5 and the gas outlet 44 are arranged outside the housing 1, and the bottom of the inlet pipe section 5 and the gas inlet 45 are arranged inside the housing 1. A flow deflecting member 2 is provided at the bottom end of the inlet pipe section 5.

[0031] The bias flow component 2 includes a first bias flow part 21 and a second bias flow part 22 arranged at the bottom of the first bias flow part 21. The first bias flow part 21 includes a first pipe body 212 and a number of first bias flow vanes 211 vertically arranged evenly. The first bias flow vanes 211 are fixedly arranged inside the first pipe body 212, and the adjacent first bias flow vanes 211 are arranged in parallel; the second bias flow part 22 includes a second pipe body 222 and a number of second bias flow vanes 221 arranged obliquely evenly. The second pipe body 222 is obliquely arranged at the bottom of the first pipe body 212. The second bias flow vanes 221 are fixedly arranged inside the second pipe body 222, and the adjacent second bias flow vanes 221 are arranged in parallel. The included angle between the second bias flow vanes 221 and the axis is 30°, and the inclination direction of the second bias flow vanes 221 is away from the measuring pipe 4. The number of the first bias flow vanes 211 is the same as that of the second bias flow vanes 221 and they are arranged correspondingly. The top end of the second bias flow vane 221 is fixedly arranged at the bottom end of the first bias flow vane 211.

[0032] The space in the first buffer air chamber 7 is larger than the spaces in the inlet pipe section 5 and the bias flow component 2.

[0033] A flow guide member 3 is arranged on the outer periphery of the second straight pipe section 42. The flow guide member 3 and the measuring pipe 4 are fixedly arranged in the housing 1. A second buffer air chamber 8 is arranged between the flow guide member 3 and the second straight pipe section 42. The flow guide member 3 is a tubular structure with one end closed and one end open. The open end is in a horn shape, and the closed end is in an arc shape. A spike 9 is arranged at the closed end inside the flow guide member 3. The spike 9 is conical and is densely and evenly distributed. The spike 9 is 5 mm high, and the spike 9 has the function of buffering the gas flow and reducing the noise.

[0034] The axis of the inlet pipe section 5 is parallel to the axis of the first straight pipe section 41.

[0035] The cross-section of the inlet pipe section 5 is circular, and the cross-section of the bias flow component 2 is circular.

[0036] The distance between the closed end of the flow guide member 3 and the gas inlet 45 is 12 mm.

[0037] The bent pipe section 43 faces the inlet pipe section 5.

[0038] Working principle: When in use, the gas enters the gas meter housing 1 through the inlet pipe section 5. The vertically arranged first bias flow vanes 211 and the obliquely arranged second bias flow vanes 221 in the bias flow component 2 disperse the gas into multiple strands. The multiple strands of gas enter the first buffer air chamber 7 and direct the gas away from the measuring pipe 4. The space in the first buffer air chamber 7 is relatively large, which has a good effect of stabilizing the flow and pressure, and can buffer the sudden drop and increase of the gas.

[0039] The gas in the first buffer chamber 7 enters the second buffer chamber 8 along the flow guide 3. The gas passing through the second buffer chamber 8 rectifies the gas, making the gas flow field stable and the airflow direction consistent. Then the gas passes through the spikes 9 at the bottom of the flow guide 3. The spikes 9 evenly distribute the gas and at the same time have the function of buffering the airflow and reducing noise. The bottom of the flow guide 3 is arc-shaped, playing a role in stabilizing the flow. Finally, the gas enters the measuring tube 4 through the gas inlet 45, and the ultrasonic sensor 10 measures the velocity of the gas flowing through. The volume of the gas flowing through is calculated by the flow rate, and the gas is discharged through the gas outlet 44.

[0040] The gas changes the direction of the original airflow through the flow deflection member 2, causing the airflow to diffuse locally. Then, through the flow stabilization of the first buffer chamber 7, the rectification of the flow guide 3, and the flow stabilization of the spikes 9, the rectification and voltage stabilization effects are prominent. At the same time, the included angle between the axis of the ultrasonic sensor 10 and the axis of the second straight pipe section 42 is 55°. The sound path of the ultrasonic sensor 10 increases, and the resolution is improved, which can cope with the problem of pressure instability caused by the frequent adjustment of the airflow size by the backend users, so that the influence of pressure fluctuation on the measurement of small flow rates is small and the measurement accuracy is high.

[0041] The above has described the embodiments of the present invention in detail in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. Ultrasonic measuring pipe section, characterized by: The measuring tube (4) comprises a first straight tube section (41), a curved tube section (43) and a second straight tube section (42) which are connected in sequence; one end of the first straight tube section (41) is a gas outlet (44) and the other end is fixedly connected to the curved tube section (43); one end of the second straight tube section (42) is a gas inlet (45) and the other end is fixedly connected to the curved tube section (43).

2. The ultrasonic measuring pipe section according to claim 1, characterized in that: An ultrasonic sensor (10) is provided on both sides of the second straight pipe section (42), and the ultrasonic sensor (10) is arranged at an angle.

3. The ultrasonic measuring pipe section according to claim 2, characterized in that: The axes of the two ultrasonic sensors (10) are on the same straight line, and the angle between the axes of the ultrasonic sensors (10) and the axis of the second straight pipe section (42) is 55°.

4. An ultrasonic gas meter, characterized in that: It comprises a shell (1), a first buffer air chamber (7) is arranged in the shell (1), and an inlet pipe section (5) and a measuring tube (4) according to any one of claims 1 to 3 are arranged on the shell (1); The top of the inlet pipe section (5) and the gas outlet (44) are arranged outside the shell (1), the bottom of the inlet pipe section (5) and the gas inlet (45) are arranged inside the shell (1), and a flow deflector (2) is provided at the bottom end of the inlet pipe section (5).

5. The ultrasonic gas meter according to claim 4, characterized in that: The flow deflector (2) comprises a first flow deflector (21) and a second flow deflector (22) arranged at the bottom of the first flow deflector (21), the first flow deflector (21) comprising a first tube (212) and a plurality of first flow deflector plates (211) uniformly and vertically arranged, the first flow deflector plates (211) being fixedly arranged inside the first tube (212), and adjacent first flow deflector plates (211) being arranged in parallel; The second deflector component (22) comprises a second tube body (222) and a plurality of second deflector plates (221) arranged uniformly and tilted, the second tube body (222) being tilted at the bottom of the first tube body (212), the second deflector plates (221) being fixedly arranged inside the second tube body (222), adjacent second deflector plates (221) being arranged in parallel, the angle between the second deflector plates (221) and the axial direction being 30°, the tilting direction of the second deflector plates (221) being a direction away from the measuring tube (4), the first deflector plates (211) and the second deflector plates (221) being the same in number and being arranged correspondingly, and the top end of the second deflector plates (221) being fixedly arranged at the bottom end of the first deflector plates (211).

6. The ultrasonic gas meter according to claim 5, characterized in that: The space in the first buffer air chamber (7) is larger than the space in the inlet pipe section (5) and the flow deflector (2).

7. The ultrasonic gas meter according to claim 4, characterized in that: A flow guide (3) is provided on the outer periphery of the second straight pipe section (42); the flow guide (3) and the measuring tube (4) are fixedly arranged in the housing (1); a second buffer air chamber (8) is provided between the flow guide (3) and the second straight pipe section (42); the flow guide (3) is a tubular structure with one end closed and the other end open, the open end is trumpet-shaped, and the closed end is arc-shaped; spikes (9) are provided at the closed end inside the flow guide (3); the spikes (9) are conical, densely and evenly distributed, and the height of the spikes (9) is 5 mm.

8. The ultrasonic gas meter according to claim 4, characterized in that: The axis of the inlet pipe section (5) is parallel to the axis of the first straight pipe section (41); The cross section of the inlet pipe section (5) is circular, and the cross section of the flow deflector (2) is circular.

9. The ultrasonic gas meter according to claim 7, characterized in that: The distance between the closed end of the flow guide (3) and the gas inlet (45) is 12 mm.

10. The ultrasonic gas meter according to claim 4, characterized in that: The curved pipe section (43) faces the inlet pipe section (5).

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