Self-adaptive adjusting device for flow field of double-track ultrasonic gas flowmeter

Abstract

The invention relates to the technical field of flow field adjustment, in particular to a double-track ultrasonic gas flowmeter flow field self-adaptive adjusting device which comprises a first round pipe section, a second round pipe section and a square pipe section connecting the first round pipe section and the second round pipe section, and the square pipe section is provided with a first downstream transducer and a second downstream transducer which are arranged side by side. According to the ultrasonic flowmeter, the first upstream transducer and the second upstream transducer are arranged side by side, the correction calculation of the flow velocity is simplified through the design of the square pipeline at the ultrasonic flowmeter, the flow field in the section of the pipeline is adjusted through the flow equalizing device, and the measurement precision of the ultrasonic flowmeter is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of flow field regulation, and specifically to a flow field adaptive regulation device for a dual-channel ultrasonic gas flowmeter. Background Art

[0002] Dual-channel ultrasonic flowmeters are based on the Time-of-Flight (TOF) principle. The flow velocity is calculated by measuring the time difference between the ultrasonic waves propagating downstream and upstream in the fluid. Its core structure is to symmetrically install two pairs of transducers (transmitters / receivers) on both sides of the pipeline, forming two independent acoustic paths. When the fluid flows, the propagation speed of the ultrasonic wave in the downstream direction will increase (sound speed + flow velocity), while in the upstream direction it will decrease (sound speed - flow velocity). The time difference between the two paths is proportional to the fluid flow velocity. By measuring the two groups of time differences and taking the average value, the error caused by the asymmetric flow field or installation deviation in a single channel can be significantly reduced, improving the measurement accuracy (typical error ±0.5% - 1%). The dual-channel design can also exclude local eddy currents or impurity interference through cross-validation, and is applicable to various media such as gases and liquids. It is more reliable than a single channel, especially when the pipeline flow field is uneven.

[0003] Traditional ultrasonic flowmeters use a circular pipeline design. However, in the case of low flow velocity or laminar flow, the right-angle structure of a square pipeline can suppress the secondary flow commonly found in a circular pipeline. Moreover, a square pipeline is convenient for arranging multiple pairs of ultrasonic transducers (such as 4 channels or 8 channels). By measuring through multiple paths, the flow field information can be captured more comprehensively, reducing the error caused by the asymmetric velocity distribution. In addition, the square pipeline design makes the flow field change in the pipeline smoother, and the square cross-section simplifies the correction calculation method when calculating the flow velocity. However, when the fluid enters the square pipeline from the circular pipeline, disturbances will occur, and corresponding devices need to be set up to regulate the flow field. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a flow field adaptive regulation device for a dual-channel ultrasonic gas flowmeter. The square pipeline design at the ultrasonic flowmeter simplifies the correction calculation of the flow velocity, and the flow equalizing device regulates the flow field within the pipeline cross-section, ensuring the measurement accuracy of the ultrasonic flowmeter.

[0005] To achieve the above object, the present invention provides the following technical solutions: A flow field adaptive adjustment device for a two-channel ultrasonic gas flowmeter, comprising a first circular pipe section, a second circular pipe section, and a square pipe section connecting the first circular pipe section and the second circular pipe section. The square pipe section is provided with a first downstream transducer and a second downstream transducer arranged side by side, and a first upstream transducer and a second upstream transducer arranged side by side; a flow equalizing device and an inlet device are arranged in the square pipe section; the fluid enters the flow equalizing device from the inlet device, and the fluid enters the square pipe section from the first circular pipe section through the flow equalizing device to stabilize the flow field; a rectifying device is arranged at the upstream positions of the first upstream transducer and the second upstream transducer in the square pipe section; an actuating component is further arranged on one side of the first upstream transducer and the second upstream transducer on the square pipe section; the actuating component can cover the concave area on one side of the first upstream transducer and the second upstream transducer.

[0006] Further, the inlet device includes a support ring located upstream and an inlet pipe facing downstream; the flow equalizing device includes an outlet pipe facing upstream and a drainage ring located downstream; the inner wall of the inlet pipe forms a conical surface, and the inner diameter of the inlet pipe is larger than the outer diameter of the outlet pipe.

[0007] Further, the support ring, the inlet pipe and the inner wall of the first circular pipe section enclose a second cavity; the drainage ring, the outlet pipe and the inner wall of the first circular pipe section enclose a first cavity; the first cavity and the second cavity are arranged opposite to each other; after being guided by the conical surface of the inlet pipe, part of the fluid can enter the first cavity, and after being reflected by the drainage ring, it can enter the second cavity and generate a circulating flow.

[0008] Further, a plurality of diversion holes are uniformly arranged on the drainage ring of the flow equalizing device; the diversion holes are composed of round holes and hemispherical plates arranged on the round holes; after the fluid passes through the round holes of the diversion holes, it is acted on by the hemispherical plates and changes direction; and the drainage ring is divided into multiple intervals, and the diversion directions of the diversion holes in different intervals are different.

[0009] Further, the cross-sectional area of the outlet pipe of the flow equalizing device is a first area; the cross-sectional area of the square pipe section is a second area; the area outside the projection of the first area in the second area is a drainage area; the diversion holes in different intervals of the drainage ring evenly guide the fluid into the drainage areas at different positions in the second area.

[0010] Further, the direction extending from the center of the square pipe section to a right-angled vertex is a third direction; the vertical direction adjacent to the third direction is a first direction; the horizontal direction adjacent to the third direction is a second direction; the diversion holes in the interval between the first direction and the third direction on the drainage ring of the flow equalizing device are arranged facing the third direction; the diversion holes in the interval between the second direction and the third direction on the drainage ring of the flow equalizing device are arranged facing the third direction.

[0011] Further, the opening of the hemispherical plate on the round hole of the diversion hole in the interval between the first direction and the third direction faces the third direction; the opening of the hemispherical plate on the round hole of the diversion hole in the interval between the second direction and the third direction faces the third direction; no hemispherical plate is provided on the round hole of the diversion hole distributed along the third direction.

[0012] Further, the first downstream transducer, the second downstream transducer, the first upstream transducer and the second upstream transducer are inclined; after the ultrasonic waves depart from the first upstream transducer and the second upstream transducer, they are received by the first downstream transducer and the second downstream transducer along a straight path; the straight path of the ultrasonic waves is perpendicular to the transmitting / receiving end face of the transducer; a concave area is formed between the transmitting / receiving end face of the transducer and the pipe wall of the square pipe section; a slider of the actuating assembly is arranged in the concave area.

[0013] Further, the slider of the actuating assembly is connected to the sealing plate through an elastomer; an electromagnetic coil is installed outside the sealing plate, and the slider is driven to move and reset through the electromagnetic coil and the elastomer.

[0014] Further, the slider slides along the channel in the square pipe section, and limiting grooves are arranged on both sides of the channel; limiting parts are arranged on both sides of the slider, and the limiting parts cooperate with the limiting grooves; a groove is also arranged on the slider.

[0015] Compared with the prior art, the present invention provides a flow field adaptive adjustment device for a dual-channel ultrasonic gas flowmeter, which has the following beneficial effects: the square pipe design at the ultrasonic flowmeter of the present invention makes the change of the flow field in the pipe smoother, and the square cross-section simplifies the correction calculation method during the flow velocity calculation. The flow field in the square pipe can be adjusted through the flow equalizing device to ensure that the fluid in each area of the square cross-section passes through the rectifying device at a uniform speed. At the same time, the inlet device and the flow equalizing device can reduce the liquid water and solid impurities in the natural gas; an actuating device is arranged at the ultrasonic transducer to clean the deposited liquid water and impurities, which can prevent the ultrasonic waves from being interfered by refraction and occlusion, and ensure the measurement accuracy. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the flow field adaptive adjustment device for the dual-channel ultrasonic gas flowmeter of the present invention; Figure 2 It is a sectional view of the flow field adaptive adjustment device for the gas flowmeter of the present invention; Figure 3 It is a cross-sectional view of the flow field adaptive adjustment device for the gas flowmeter of the present invention; Figure 4 It is a schematic diagram of the flow field at the flow equalizing device of the present invention; Figure 5 Structural schematic diagram of the entry device and the flow equalizing device of the present invention; Figure 6 Structural schematic diagram of the flow equalizing device of the present invention; Figure 7 Structural schematic diagram of the diversion holes on the flow equalizing device of the present invention; Figure 8 Structural schematic diagram at the upstream transducer of the present invention; Figure 9 Structural schematic diagram at the upstream transducer after the slider is ejected of the present invention; Figure 10 Exploded structural schematic diagram of the actuating assembly of the present invention; Figure 11 Structural schematic diagram of the flowmeter tube body of the present invention; Figure 12 Structural schematic diagram of the slider of the actuating assembly of the present invention; In the figure: First circular pipe section 1, first direction 11, second direction 12, third direction 13, second circular pipe section 10; Square pipe section 2, first area 21, second area 22, drainage area 20; First downstream transducer 3, second downstream transducer 30; First upstream transducer 4, second upstream transducer 40, recessed area 400, limiting groove 41, channel 42; Actuating assembly 5, slider 51, limiting part 511, groove 512, elastic body 52, sealing plate 53, electromagnetic coil 54; Flow equalizing device 6, outlet pipe 61, drainage ring 62, first cavity 63, diversion holes 60, first diversion area 601, second diversion area 602, round holes 621, hemispherical plate 622; Entry device 7, inlet pipe 71, conical surface 710, support ring 72, second cavity 73; Rectifying device 8. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Next, according to the attached Figures 1-12A detailed description of the present invention is provided. The flow field adaptive adjustment device of the dual-channel ultrasonic gas flowmeter of the present invention includes a first circular pipe section 1 and a second circular pipe section 10, as well as a square pipe section 2 connecting the first circular pipe section 1 and the second circular pipe section 10. The square pipe section 2 is provided with a first downstream transducer 3 and a second downstream transducer 30 arranged side by side, and a first upstream transducer 4 and a second upstream transducer 40 arranged side by side. A flow straightening device 6 and an inlet device 7 are arranged in the square pipe section 2. The fluid enters the flow straightening device 6 from the inlet device 7, and the fluid enters the square pipe section 2 from the first circular pipe section 1 through the flow straightening device 6 to stabilize the flow field. A rectifying device 8 is arranged at the upstream position of the first upstream transducer 4 and the second upstream transducer 40 in the square pipe section 2. An actuating assembly 5 is also arranged on one side of the first upstream transducer 4 and the second upstream transducer 40 on the square pipe section 2. The actuating assembly 5 can cover the recessed area 400 on one side of the first upstream transducer 4 and the second upstream transducer 40.

[0019] Specifically, the flow straightening device 6 of the present invention is arranged at a position close to where the fluid enters the square pipe section 2 from the first circular pipe section 1. Due to the sudden change in the cross-sectional shape of the first circular pipe section 1 and the square pipe section 2, that is, from circular to square, the fluid is prone to separation and vortex formation at the corner, and the flow velocity in the corner area of the square pipe is low while the flow velocity in the center is high, which will lead to uneven velocity distribution. The rectifying device 8 in the present invention is a honeycomb structure, composed of a plurality of densely arranged long straight holes. Refer to the appendix Figure 2 and 3 . By setting the rectifying device 8, the vortices and secondary flows in the flow field can be reduced, but the problem that the flow velocity in the central area of the square pipe section 2 is high while the flow velocity in the corner area is low cannot be changed. In the present invention, a flow straightening device 6 is arranged upstream of the rectifying device 8 and at a position close to where the fluid enters the square pipe section 2 from the first circular pipe section 1, which can guide the flow field in the cross-sectional area of the first circular pipe section 1 outside the cross-section of the square pipe section 2 to the corner area of the cross-section of the square pipe section 2. Refer to the appendix Figure 7 , so that the flow velocities in each area of the flow field in the square pipe section 2 are evenly distributed, improving the measurement accuracy of the ultrasonic gas flowmeter.

[0020] In addition, due to factors such as the original water content in the formation, residual mining, transportation condensation, and external intrusion, natural gas contains liquid water. Solid impurities (such as dust) or liquid water in natural gas are deposited on the inner wall of the flowmeter, such as deposited on Figures 8-11In the sunken area 400, it will interfere with the reflection path of ultrasonic waves, resulting in signal attenuation or refraction, and reducing the measurement accuracy. When the liquid water covers the probes of the first upstream transducer 4 and the second upstream transducer 40, the ultrasonic waves are refracted when entering and exiting the water layer, and the sensor cannot effectively receive the signals, resulting in measurement errors or signal loss. The actuating assembly 5 in the present invention can cover the sunken area 400 on one side of the first upstream transducer 4 and the second upstream transducer 40, eject the deposited liquid water therein and be carried away by the fluid. See the appendix Figure 9 , which can prevent the probes of the first upstream transducer 4 and the second upstream transducer 40 from being covered by liquid water, and ensure the measurement accuracy of the ultrasonic gas flowmeter.

[0021] The inlet device 7 includes a support ring 72 located upstream and an inlet pipe 71 facing downstream; the flow equalizing device 6 includes an outlet pipe 61 facing upstream and a diversion ring 62 located downstream; a conical surface 710 is formed on the inner wall of the inlet pipe 71, and the inner diameter of the inlet pipe 71 is larger than the outer diameter of the outlet pipe 61.

[0022] The support ring 72, the inlet pipe 71 and the inner wall of the first circular pipe section 1 enclose a second cavity 73; the diversion ring 62, the outlet pipe 61 and the inner wall of the first circular pipe section 1 enclose a first cavity 63; the first cavity 63 and the second cavity 73 are arranged facing each other; after being guided by the conical surface 710 of the inlet pipe 71, part of the fluid can enter the first cavity 63, and after being reflected by the diversion ring 62, it can enter the second cavity 73 and generate a circulating flow.

[0023] Specifically, see Figures 2-4 , the inlet pipe 71 of the inlet device 7 and the outlet pipe 61 of the flow equalizing device 6 are arranged facing each other, so that after the fluid enters the first cavity 63 and the second cavity 73, it can circulate between the first cavity 63 and the second cavity 73, causing a small amount of impurities such as liquid water and solid particles in the fluid to deposit, and reducing the interference of impurities in the natural gas on the downstream flowmeter. The inlet pipe 71 is of a cylindrical structure, one end of the support ring 72 is connected to the upstream end of the inlet pipe, and the other end is connected to the pipe wall of the first circular pipe section 1; the outlet pipe 61 is also of a cylindrical structure with a smaller diameter, one end of the diversion ring 62 is connected to the downstream end of the outlet pipe 61, and the other end is connected to the pipe wall of the first circular pipe section 1.

[0024] A plurality of diversion holes 60 are uniformly arranged on the diversion ring 62 of the flow equalizing device 6; the diversion holes 60 are composed of circular holes 621 and hemispherical plates 622 arranged on the circular holes 621; after the fluid passes through the circular holes 621 of the diversion holes 60, it is acted on by the hemispherical plates 622 and changes direction; and the diversion ring 62 is divided into a plurality of intervals, and the diversion directions of the diversion holes 60 in different intervals are different.

[0025] Specifically, the diversion holes 60 on the flow equalizing device 6 in the present invention can change the flow direction of the passing fluid, thereby playing a role in diversion and velocity equalization. The cross-sectional area of the inlet pipe 71 of the device 7 is larger than that of the square pipe section 2. To increase the flow velocity in the corner area of the square pipe section 2, the fluid passing through the outlet pipe 61 of the flow equalizing device 6 enters the central area of the square pipe section 2, and the fluid passing through the diversion ring 62 of the flow equalizing device 6 enters the corner area of the square pipe section 2. Refer to Figure 7 , and the diversion holes 60 with different orientations in different areas of the diversion ring 62 guide the passing fluid to flow towards the four corner areas of the square pipe section 2, thereby reducing the velocity difference between the central area and the corner area of the rectifying device 8.

[0026] The cross-sectional area of the outlet pipe 61 of the flow equalizing device 6 is the first area 21; the cross-sectional area of the square pipe section 2 is the second area 22; the area outside the projection of the first area 21 in the second area 22 is the diversion area 20; the diversion holes 60 in different intervals of the diversion ring 62 evenly guide the fluid into the diversion areas 20 at different positions in the second area 22.

[0027] Specifically, as Figure 7 shown, the first area 21 is the circular cross-section of the outlet pipe 61 of the flow equalizing device 6, the second area 22 is the square cross-section of the square pipe section 2, and the areas at the four corners outside the first area 21 in the second area 22 are the diversion areas 20, that is, the corner areas of the square pipe section 2. When the fluid enters the square pipe section 2 from the first circular pipe section 1, the flow velocity in the first area 21 in the square pipe section 2 will be greater than that in the diversion area 20. The diversion holes 60 guide more fluid into the diversion area 20, thereby increasing the flow velocity in the diversion area 20 and balancing the velocity difference between the central area and the corner area of the square pipe section 2.

[0028] The direction extending from the center of the square pipe section 2 to a right-angle vertex is the third direction 13; the vertical direction adjacent to the third direction 13 is the first direction 11; the horizontal direction adjacent to the third direction 13 is the second direction 12; the diversion holes 60 in the interval between the first direction 11 and the third direction 13 on the diversion ring 62 of the flow equalizing device 6 are arranged towards the third direction 13; the diversion holes 60 in the interval between the second direction 12 and the third direction 13 on the diversion ring 62 of the flow equalizing device 6 are arranged towards the third direction 13.

[0029] Specifically, as Figure 7As shown, the first direction 11 is the vertically upward direction, the second direction 12 is the horizontally rightward direction, and the third direction 13 is the direction that coincides with the vertex of the right angle in the upper right of the square pipe section 2. The diversion holes 60 in the interval between the first direction 11 and the third direction 13 guide the fluid into the diversion area 20 corresponding to the third direction 13. The diversion holes 60 in the interval between the second direction 12 and the third direction 13 guide the fluid into the diversion area 20 corresponding to the third direction 13. Similarly, there are the same number of diversion holes 60 in the diversion areas 20 in other directions to introduce the fluid into them, so that the fluid passing through the diversion ring 62 of the flow equalizing device 6 can be evenly guided into the diversion areas 20 in four different directions, thereby increasing the flow velocity in the diversion area 20 and balancing the velocity difference between the central area and the corner area of the square pipe section 2.

[0030] The opening of the hemispherical plate 622 on the round hole 621 of the diversion hole 60 in the interval between the first direction 11 and the third direction 13 faces the third direction 13; the opening of the hemispherical plate 622 on the round hole 621 of the diversion hole 60 in the interval between the second direction 12 and the third direction 13 faces the third direction 13; no hemispherical plate 622 is provided on the round hole 621 of the diversion hole 60 distributed along the third direction 13.

[0031] Specifically, referring to Figure 7 , the third direction 13 is the four directions towards the four right angles of the cross-section of the square pipe section 2, and no hemispherical plate 622 is provided on the round holes 621 of the diversion holes 60 distributed in these directions. The hemispherical plate 622 can be formed by punching the excess material into the hemispherical plate 622 by the punch when punching the round hole 621, and the manufacturing process is simple and practical.

[0032] The first downstream transducer 3, the second downstream transducer 30, the first upstream transducer 4, and the second upstream transducer 40 are inclined; the ultrasonic waves are received by the first downstream transducer 3 and the second downstream transducer 30 along a straight path after departing from the first upstream transducer 4 and the second upstream transducer 40; the straight path of the ultrasonic waves is perpendicular to the transmitting / receiving end face of the transducer; the transmitting / receiving end face of the transducer forms a recessed area 400 with the pipe wall of the square pipe section 2; a slider 51 of the actuating assembly 5 is provided in the recessed area 400.

[0033] The inclined transducers can obtain a longer measurement path in a smaller volume, thereby improving the measurement accuracy of the ultrasonic flowmeter. In order to reduce the refraction of the ultrasonic waves, it is necessary to make the moving path of the ultrasonic waves perpendicular to the transmitting / receiving end face of the transducer. Therefore, an inevitable recessed area 400 is formed at the transmitting / receiving end face of the transducer and the pipe wall of the square pipe section 2. When liquid water or other natural gas impurities are deposited in the recessed area 400, the passing ultrasonic waves will be refracted or blocked, affecting the measurement of the ultrasonic flowmeter.

[0034] The slider 51 of the actuating assembly 5 is connected to the sealing plate 53 through an elastomer 52; an electromagnetic coil 54 is installed on the outer side of the sealing plate 53, and the slider 51 is driven to move and reset through the electromagnetic coil 54 and the elastomer 52.

[0035] Specifically, the pipe wall of the square pipe section 2 and the sealing plate 53 in the present invention are made of non-magnetic materials, the slider 51 is made of magnetic materials, and after the electromagnetic coil 54 is energized, a thrust is generated on the slider 51. The slider 51 covers the concave area 400 and pushes out the deposited liquid water / other impurities. At this time, the slider 51 will temporarily block the ultrasonic waves emitted by the transducer. Refer to the appendix Figure 9 , and the pushed liquid water / impurities are removed by using a fluid. After the electromagnetic coil 54 is de-energized, the elastomer 52 is used to restore the slider 51 to its initial position. The braking assembly 5 of the present invention uses the electromagnetic coil 54 for non-contact driving, and can use the sealing plate 53 to achieve better sealing and prevent natural gas leakage at the actuating mechanism.

[0036] The slider 51 slides along the channel 42 in the square pipe section 2, and limiting grooves 41 are arranged on both sides of the channel 42; limiting portions 511 are arranged on both sides of the slider 51, and the limiting portions 511 cooperate with the limiting grooves 41; a groove 512 is further arranged on the slider 51.

[0037] Specifically, the channel 42 is perpendicular to the ultrasonic wave path generated by the first upstream transducer 4. Refer to the appendix Figure 10 , the limiting grooves 41 and the limiting portions 511 on both sides of the channel 42 limit the pushing position of the slider 51 and the original position after reset. When the slider 51 is in the original position, the groove 512 on it forms an ultrasonic wave emission channel for the transducer.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-channel ultrasonic gas flow meter flow field adaptive adjustment device, comprising a first circular pipe segment (1), a second circular pipe segment (10), and a square pipe segment (2) connecting the first circular pipe segment (1) and the second circular pipe segment (10), characterized in that: The square tube section (2) is provided with a first downstream transducer (3) and a second downstream transducer (30) arranged side by side, and a first upstream transducer (4) and a second upstream transducer (40) arranged side by side; The square tube section (2) is provided with a flow equalizing device (6) and an inlet device (7); The fluid enters the flow balancing device (6) from the inlet device (7), and the fluid enters the square tube segment (2) from the first circular tube segment (1) through the flow balancing device (6) to stabilize the flow field; A rectifying device (8) is provided at an upstream position of the first upstream transducer (4) and the second upstream transducer (40) in the square tube section (2); An actuating assembly (5) is also provided on one side of the first upstream transducer (4) and the second upstream transducer (40) on the square tube section (2); The actuating assembly (5) is capable of covering the recessed area (400) on one side of the first upstream transducer (4) and the second upstream transducer (40).

2. The flow meter flow field adaptive adjustment device according to claim 1 is characterized in that: The inlet device (7) comprises a support ring (72) located upstream and an inlet pipe (71) facing downstream; The flow balancing device (6) comprises an outlet pipe (61) facing upstream and a flow guide ring (62) located downstream; The inner wall of the inlet pipe (71) forms a conical surface (710), and the inner diameter of the inlet pipe (71) is greater than the outer diameter of the outlet pipe (61).

3. The flow meter flow field adaptive adjustment device according to claim 2 is characterized in that: The support ring (72), the inlet pipe (71) and the inner wall of the first circular pipe section (1) form a second cavity (73); The drainage ring (62), the outlet pipe (61) and the inner wall of the first circular pipe section (1) form a first cavity (63); The first cavity (63) and the second cavity (73) are arranged facing each other; The fluid can partially enter the first cavity (63) after being guided by the conical surface (710) of the inlet pipe (71), and can enter the second cavity (73) after being reflected by the drainage ring (62) to generate a circulating flow.

4. The flow meter flow field adaptive adjustment device according to claim 3 is characterized in that: A plurality of flow guide holes (60) are evenly arranged on the flow guide ring (62) of the flow balancing device (6); The guide hole (60) is composed of a circular hole (621) and a hemispherical plate (622) arranged on the circular hole (621); After the fluid passes through the circular hole (621) of the flow guide hole (60), it is acted upon by the hemispherical plate (622) and changes direction; Furthermore, the guide ring (62) is divided into a plurality of sections, and the guide holes (60) in different sections have different guide directions.

5. The flow meter flow field adaptive adjustment device according to claim 4 is characterized in that: The cross-sectional area of ​​the outlet pipe (61) of the flow balancing device (6) is the first area (21); The cross-sectional area of ​​the square tube section (2) is the second area (22); The area of ​​the first area (21) outside the projection of the second area (22) is the drainage area (20); The guide holes (60) in different sections of the guide ring (62) guide the fluid evenly into the guide areas (20) at different positions of the second area (22).

6. The flow meter flow field adaptive adjustment device according to claim 5, characterized in that: A direction extending from the center of the square tube section (2) to a right-angle vertex is a third direction (13); A vertical direction adjacent to the third direction (13) is a first direction (11); A horizontal direction adjacent to the third direction (13) is a second direction (12); The flow guide holes (60) in the interval between the first direction (11) and the third direction (13) on the flow guide ring (62) of the flow equalizing device (6) are arranged toward the third direction (13); The flow guide holes (60) in the interval between the second direction (12) and the third direction (13) on the flow guide ring (62) of the flow equalizing device (6) are arranged toward the third direction (13).

7. The flow meter flow field adaptive adjustment device according to claim 6, characterized in that: The opening of the hemispherical plate (622) on the circular hole (621) of the guide hole (60) in the interval between the first direction (11) and the third direction (13) faces the third direction (13); The opening of the hemispherical plate (622) on the circular hole (621) of the guide hole (60) in the interval between the second direction (12) and the third direction (13) faces the third direction (13); No hemispherical plate (622) is provided on the circular holes (621) of the guide holes (60) distributed along the third direction (13).

8. The flow meter flow field adaptive adjustment device according to claim 7, characterized in that: The first downstream transducer (3), the second downstream transducer (30), the first upstream transducer (4) and the second upstream transducer (40) are arranged at an angle; The ultrasonic wave is received by the first downstream transducer (3) and the second downstream transducer (30) along a straight path after starting from the first upstream transducer (4) and the second upstream transducer (40); The straight path of the ultrasonic wave is perpendicular to the transmitting / receiving end surface of the transducer; The transmitting / receiving end surface of the transducer and the tube wall of the square tube section (2) form a recessed area (400); A slider (51) of the actuating assembly (5) is arranged in the recessed area (400).

9. The flow meter flow field adaptive adjustment device according to claim 8, characterized in that: The slider (51) of the actuating assembly (5) is connected to the sealing plate (53) via an elastic body (52); An electromagnetic coil (54) is installed on the outer side of the sealing plate (53), and the sliding block (51) is driven to move and reset via the electromagnetic coil (54) and the elastic body (52).

10. The flow meter flow field adaptive adjustment device according to claim 9, characterized in that: The sliding block (51) slides along the channel (42) in the square tube section (2), and limiting grooves (41) are provided on both sides of the channel (42); Limiting portions (511) are provided on both sides of the sliding block (51), and the limiting portions (511) cooperate with the limiting grooves (41); The sliding block (51) is also provided with a groove (512).

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