CN115265689B

CN115265689B - Ultrasonic reflection structure, measurement pipeline section and ultrasonic flowmeter

Info

Publication number: CN115265689B
Application number: CN202211209706.XA
Authority: CN
Inventors: 袁方方; 李长城; 魏庆明; 侯波; 王昊桢
Original assignee: Jinan Peihua Information Technology Co ltd
Current assignee: Jinan Peihua Information Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-31
Anticipated expiration: 2042-09-30
Also published as: CN115265689A

Abstract

The application relates to the technical field of flow monitoring and forecasting, and provides an ultrasonic reflection structure, a metering pipe section and an ultrasonic flowmeter. The ultrasonic reflection structure includes a tube structure, an ultrasonic reflection sheet assembly, first and second dome structures. The upper and lower half pipes of the pipe body structure are spliced to form a flow passage. The first arch structure is arranged at the inlet of the flow passage, the surface of the first arch structure is provided with a slope-shaped flow guide surface, and the extension of the first arch structure along the circumferential direction of the pipe body structure is not more than one half of the whole circumference. The second arch structure is arranged at the outlet of the flow passage, the surface of the second arch structure is provided with a slope-shaped flow guide surface, and the extension of the second arch structure along the circumferential direction of the pipe body structure is not more than one half of the whole circumference. The ultrasonic reflector assembly is arranged in the flow channel, so that ultrasonic waves form a W-shaped reflection track in the flow channel. The fluid is accelerated by the gentle reducing structure, incoming flow is combed, the difference of axial distribution of the flow velocity along the flow passage is reduced, the uniformity of axial distribution of the flow velocity along the flow passage is improved, and the measurement accuracy and stability of the flowmeter are improved.

Description

Ultrasonic reflection structure, measurement pipeline section and ultrasonic flowmeter

Technical Field

The application relates to the technical field of flow monitoring and forecasting, in particular to an ultrasonic reflection structure, a metering pipe section and an ultrasonic flowmeter.

Background

Ultrasonic flow meters are meters that measure flow by detecting the effect of fluid flow on an ultrasonic beam (or pulse). The ultrasonic flowmeter has wide application fields, such as raw water flow measurement, seawater flow measurement, marine environment monitoring and forecasting of rivers and reservoirs and the like; municipal sewage measurement, tap water flow measurement and the like; measuring the flow of the original production of the oil field, measuring the flow of well cementation slurry and the like; petrochemical and petrochemical product process flow detection, industrial circulating water flow measurement and the like; measuring water consumption in the production process, measuring and controlling process flow, and the like. For the ultrasonic flowmeter, the flow state of a medium flowing through the inner metering pipe section is an important factor influencing the measurement accuracy of the ultrasonic flowmeter.

For example, ultrasonic water meters and ultrasonic heat meters all belong to ultrasonic flow meters. In the conventional structure of ultrasonic water meter and ultrasonic heat meter, the reflector plate for ultrasonic transmission is generally erected in the flow channel of a metering pipe section through a column type, support type or insertion type structure, when fluid flows through, the column type, support type or insertion type structure and the reflector plate can generate large disturbance to the fluid, the fluid entering the metering pipe section is unstable, the flow velocity along the axial direction is not uniform, errors occur in metering of the ultrasonic water meter and the ultrasonic heat meter easily, and the measurement accuracy and stability of the ultrasonic water meter and the ultrasonic heat meter are influenced.

Furthermore, some ultrasonic flow meters reduce the diameter of the flow channel of the metering pipe section from the whole circumference, so that the diameter of the flow channel is reduced in a sudden change manner, and although the fluid can be accelerated, when the fluid flows through the sudden change type reducing position, the flow velocity of the fluid is increased rapidly due to the sudden reduction of the cross section area of the flow channel, the change of the flow state is large, the velocity difference of the fluid distributed along the axial direction is likely to be increased continuously, and meanwhile, the sudden change type reducing also brings large pressure loss, and the measurement accuracy and stability of the ultrasonic flow meter are affected.

Disclosure of Invention

An object of the embodiment of the present application is to provide an ultrasonic reflection structure, which accelerates a fluid flow rate with a gentle diameter reduction structure, reduces a distribution difference of the fluid flow rate along an axial direction of a flow channel, improves uniformity of the fluid flow rate along the axial direction of the flow channel, and improves stability and measurement accuracy of an ultrasonic flow meter.

It is also a second object of embodiments of the present application to provide a metering tube segment that uses the ultrasonic reflecting structure described above.

It is a further object of embodiments of the present application to provide an ultrasonic flow meter using the above-described metering pipe section.

In a first aspect, an ultrasonic reflection structure for installation in a metering tube segment of an ultrasonic flow meter is provided, comprising a tube body structure, a first dome, a second dome, and an ultrasonic reflection assembly.

The pipe body structure comprises an upper half pipe and a lower half pipe, a flow channel for fluid to pass through is constructed by splicing the upper half pipe and the lower half pipe, and the flow channel comprises an inlet end and an outlet end. The first arched structure is arranged at the inlet end of the flow channel, the first arched structure is provided with a slope-shaped flow guide surface, the side length of the bottom of the slope-shaped flow guide surface is larger than the width of the top of the slope-shaped flow guide surface, the top of the slope-shaped flow guide surface is connected with the inlet end of the flow channel and is in smooth transition, and the extension of the first arched structure in the circumferential direction of the pipe body structure is not more than one half of the whole circumference. The second arch structure is arranged at the outlet end of the flow channel, the second arch structure is provided with a slope-shaped flow guide surface, the side length of the bottom of the slope-shaped flow guide surface is larger than the width of the top of the slope-shaped flow guide surface, the top of the slope-shaped flow guide surface is connected with the outlet end of the flow channel and is in smooth transition, and the extension of the second arch structure in the circumferential direction of the pipe body structure is not more than one half of the whole circumference. The ultrasonic reflector assembly comprises an inlet reflector, an outlet reflector and an upper reflector, and the upper reflector is embedded in the inner wall of the upper half pipe; the inlet reflector plate is embedded in the inlet end of the flow channel and is lower than the highest point of the first arch structure; the outlet reflector plate is embedded in the outlet end of the flow channel and is lower than the highest point of the second arch structure; the entrance reflector plate, the exit reflector plate and the upper reflector plate are used for enabling the ultrasonic beams to form W-shaped reflection tracks in the flow channel.

In an implementation scheme, the ultrasonic reflection structure further comprises a first carding structure and a second carding structure, the first carding structure is arranged on the slope-shaped flow guide surface of the first arch-shaped structure and comprises a plurality of grooves, each groove extends from the bottom of the slope-shaped flow guide surface to the inlet end of the flow channel, and the width of each groove decreases progressively along the water flow direction. The second carding structure is arranged on the slope-shaped flow guide surface of the second arch structure and comprises a plurality of grooves, each groove extends from the bottom of the slope-shaped flow guide surface to the outlet end of the flow channel, and the width of each groove increases progressively along the water flow direction.

In one embodiment, the flow channel formed by the pipe body structure comprises an upper channel part with a quadrangular cross section and a lower channel part with a semicircular cross section; the height of the highest point of the lower channel portion does not exceed the height of the highest point of the first arch.

In one embodiment, the upper tube half defines an upper channel portion and the lower tube half intermediate the first and second arches defines a lower channel portion.

In an implementation scheme, the upper half tube of the tube body structure comprises a top wall, the top wall is used for installing the upper reflection sheet, and the ratio of the sum of the thicknesses of the top wall and the upper reflection sheet to the diameter of the circumference where the tube body structure is located is 0.05-0.20.

In one practical scheme, the splicing seam of the upper half pipe and the lower half pipe is positioned below the middle part of the flow passage; the splicing seams of the upper half pipe and the lower half pipe comprise middle section splicing seams, and the middle section splicing seams extend from the inlet end to the outlet end of the flow channel; the height of the middle section split seam is lower than the highest point of the first arch structure and the second arch structure.

In one embodiment, the height of the lowest part of the entrance reflector and the exit reflector is higher than the height of the inner bottom of the lower tube half between the entrance reflector and the exit reflector.

According to a second aspect of the present application, there is also provided a meter spool piece for an ultrasonic flow meter, comprising a mounting tube and the ultrasonic reflection structure of the above aspect. The upper half pipe and/or the lower half pipe are/is provided with a guide groove facing to the water outlet direction, a guide strip is arranged in the installation pipe, and the guide groove and the guide strip are matched in place after the ultrasonic reflection structure is inserted into the installation pipe along the water flow direction. A first transducer groove for mounting a first transducer is formed in the outer wall of the mounting pipe, and a second transducer groove for mounting a second transducer is formed in the outer wall of the mounting pipe at a position away from the first transducer groove by a preset distance. The first transducer in the first transducer slot is used for transmitting ultrasonic waves to the inlet of the flow channel of the pipe body structure or receiving ultrasonic waves emitted from the inlet. The second transducer in the second transducer slot is used for transmitting ultrasonic waves to the outlet of the flow channel of the pipe body structure or receiving the ultrasonic waves emitted from the outlet.

In an implementable scheme, an elastic buckle is arranged at the position where the upper half pipe and/or the lower half pipe is/are attached to the inner wall of the installation pipe, and a rebound space is arranged below the elastic buckle; a clamping groove matched with the elastic buckle is formed in the mounting pipe; the ultrasonic reflection structure is inserted into the installation pipe along the water flow direction, and before the guide groove is matched with the guide strip in place, the elastic buckle is compressed into a rebound space by the inner wall of the installation pipe; after the guide groove and the guide strip are matched in place, the elastic buckle rebounds from the rebounding space to the initial state and is clamped with the clamping groove.

According to a third aspect of the present application, there is also provided an ultrasonic flow meter comprising the metering pipe section of the above aspect.

Compared with the prior art, the beneficial effect of this application is: the utility model provides an ultrasonic wave reflecting structure is when using, with ultrasonic reflecting structure along rivers direction insert the back in the measurement pipeline section, on the one hand, first half pipe and second half pipe construct the undergauge pipeline section with first domes and second domes jointly, the area of overflowing reduces, the streamline becomes intensive, the shearing force increase between the fluid micelle for fluid flow is more stable, and the fluid speed that gets into in the runner of measurement pipeline section is improved along axial distribution difference. Meanwhile, the extension of the first arch structure and the second arch structure along the circumferential direction of the pipe body structure is not more than one half of the whole circumference, namely, an arch reducing structure in a non-circumferential form is formed at the inlet and the outlet of the flow channel, the flow channel above the first arch structure and the second arch structure in the non-circumferential form keeps the original structural state, the sectional area of the flow channel is reduced gently, the fluid is accelerated gently, the change of the flowing state of the fluid is not too violent, the distribution difference of the flow velocity of the fluid along the axial direction is reduced, and the measurement precision of the ultrasonic flowmeter is improved.

On the other hand, the structure formed by the upper half pipe, the lower half pipe, the first arch structure and the second arch structure is matched with the metering pipe section, so that the pressure loss of the flowmeter is within about delta p25, the measurement precision and the stability of the ultrasonic flowmeter are improved, meanwhile, the power consumption of a pump station can be reduced, and the water delivery cost of a water department is reduced.

Furthermore, the inlet reflector plate is embedded in the inlet end of the flow channel and is lower than the highest point of the first arch structure, the outlet reflector plate is embedded in the outlet end of the flow channel and is lower than the highest point of the second arch structure, and therefore the fluid after rectification and acceleration is basically not disturbed, the disturbance effect of the reflector plate and a column type, support type or insertion type structure on the fluid is basically eliminated, the flowing state of the fluid in the flow channel is further improved, the uniformity of the fluid flow speed in the axial direction of the flow channel is improved, and the measuring accuracy of the flow meter is further improved.

Furthermore, the washing capacity of the accelerated water flow is utilized to prevent the deposition and adhesion of dirt as much as possible, so that the metering cannot be influenced by excessive dirt deposition in long-term use.

Furthermore, the ultrasonic reflection structure of the application is also provided with a first carding structure, when fluid contacts the slope-shaped flow guide surface of the first arched structure, the fluid can be accelerated by the first arched structure, meanwhile, the first carding structure formed by the grooves on the surface of the first arched structure can comb incoming flow, so that turbulent flow in the fluid in flow states such as turbulent flow, vortex flow and the like can be combed as far as possible into flow along the axial direction of the pipeline, forced alignment and straightening of the flow track of the fluid are realized, when the fluid enters the flow channel of the pipe body structure, the fluid is in a state of flowing along the axial direction, the loss of ultrasonic energy is reduced, and the measurement accuracy is improved.

In addition, the runner that this application's body structure constructed includes that the cross-section is tetragonal last passageway part and cross-section be semicircular lower channel part, the cross-section is tetragonal last passageway part and constitutes direct current channel, the passageway cross-section is kept unchanged basically by the size and the shape of entry to export, and go up passageway part by the middle no bending of entry to export, unobstructed, go up passageway part and follow rivers direction straight line extension, consequently the pressure loss is little, fluid velocity and flow state are all more stable, do benefit to the transmission of ultrasonic energy more, reduce energy loss.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram illustrating an ultrasonic reflective structure according to an embodiment of the present application;

FIG. 2 is an axial cross-sectional structural view of an ultrasonic reflecting structure according to an embodiment of the present application;

FIG. 3 is a schematic view of a first dome of an ultrasonic reflecting structure according to an embodiment of the present application;

FIG. 4 is a schematic illustration of a front view of an access opening of an ultrasonic reflecting structure according to an embodiment of the present application;

FIG. 5 is a schematic illustration of an ultrasound transmission of an ultrasound wave reflecting structure according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a radial cross-sectional configuration of an ultrasonic reflecting structure according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a transducer-externally positioned metrology pipe segment according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating a configuration of a meter spool piece with a transducer in direct contact with a liquid according to an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating positioning and installation of an ultrasonic reflecting structure in a metering tube segment according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram illustrating a snap groove, an elastic buckle, and the like in a metering pipe segment according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram illustrating the structure of an inlet, an outlet and an upper reflector according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural view of the upper and lower half-pipes provided herein, shown unassembled;

fig. 13 is a schematic cross-sectional structure of the upper and lower half pipes provided in the present application when not spliced.

In the figure: 10. a pipe body structure; 11. an upper half pipe; 111. an upper channel portion; 112. a rib structure; 113. a top wall; 12. a lower half pipe; 121. a lower channel portion; 122. a slot structure; 13. splicing and sewing the middle sections; 14. a guide groove; 15. elastic buckle; 16. a rebound space; 20. a first dome; 30. a second dome; 40. an ultrasonic reflector assembly; 41. an entrance reflector sheet; 42. an exit reflector sheet; 43. an upper reflective sheet; 51. a trench; 100. installing a pipe; 101. a guide strip; 200. A first transducer; 201. a first transducer slot; 300. a second transducer; 301. a second transducer slot.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

According to a first aspect of the present application, as shown in fig. 1-5, there is first provided an ultrasonic reflective structure for installation in a metering tube section of an ultrasonic flow meter, the ultrasonic reflective structure comprising a tube body structure 10, first and

second arches

20, 30, and an ultrasonic reflective sheet assembly 40.

The pipe body structure 10 includes an upper half pipe 11 and a lower half pipe 12, the upper half pipe 11 and the lower half pipe 12 are assembled to form a flow channel for fluid to pass through, and the flow channel includes an inlet end and an outlet end. The first arch structure 20 is disposed at the inlet end of the flow channel, the first arch structure 20 is provided with a slope-shaped flow guiding surface, the bottom side length of the slope-shaped flow guiding surface is greater than the top width, the top of the slope-shaped flow guiding surface is connected with the inlet end of the flow channel and is in smooth transition, and the extension of the first arch structure 20 along the circumferential direction of the pipe body structure 10 is not more than one half of the whole circumference, i.e. not more than 1/2 of the circumference as shown in fig. 4. The second arch structure 30 is disposed at the outlet end of the flow channel, the second arch structure 30 is provided with a slope-shaped flow guiding surface, the bottom side length of the slope-shaped flow guiding surface is greater than the top width, the top of the slope-shaped flow guiding surface is connected with the outlet end of the flow channel and is in smooth transition, and the extension of the second arch structure 30 along the circumferential direction of the pipe body structure 10 is not more than one half of the whole circumference, i.e. not more than 1/2 circumference as shown in fig. 4. The ultrasonic reflection sheet assembly 40 includes an entrance reflection sheet 41, an exit reflection sheet 42, and an upper reflection sheet 43, and the upper reflection sheet 43 is embedded in and mounted on the inner wall of the upper half pipe 11; the inlet reflector 41 is embedded in the inlet end of the flow passage and is lower than the highest point of the first arch structure 20; the exit reflector 42 is embedded in the exit end of the flow path and is lower than the highest point of the second dome 30; the entrance reflection sheet 41, the exit reflection sheet 42, and the upper reflection sheet 43 are used to form an ultrasonic beam into a W-shaped reflection trajectory in the flow channel.

When the ultrasonic reflection structure of the above embodiment is used, after the ultrasonic reflection structure is inserted into the metering pipe section along the water flow direction, on one hand, the diameter-reduced pipe sections are constructed by the upper half pipe 11 and the lower half pipe 12 together with the first arch structure 20 and the second arch structure 30, the flow area is reduced, the flow lines are dense, the shearing force among fluid micelles is increased, the fluid flow is more stable, and the distribution difference of the fluid velocity entering the flow channel of the metering pipe section along the axial direction is improved. Particularly, for the commonly used time difference method ultrasonic measurement, the fluid speed is increased, the corresponding time difference is increased, and the measurement accuracy is more stable. Meanwhile, the extension of the first arch structure 20 and the second arch structure 30 along the circumferential direction of the pipe body structure is not more than one half of the whole circumference, namely, non-circumferential arch reducing structures are formed at the inlet and the outlet of the flow channel, the flow channel above the non-circumferential arch structure 20 and the non-circumferential arch structure 30 keeps the original structural state, the sectional area of the flow channel is reduced smoothly, the smooth acceleration of the fluid is realized, the change of the flow state of the fluid is not too violent, the distribution difference of the flow velocity of the fluid along the axial direction is reduced, and the measurement precision of the ultrasonic flowmeter is improved.

On the other hand, the structure and the metering pipe section formed by the upper half pipe 11 and the lower half pipe 12 and the first arched structure 20 and the second arched structure 30 are matched, so that the pressure loss of the flowmeter is within about delta p25, the measurement accuracy and the stability of the ultrasonic flowmeter are improved, meanwhile, the power consumption of a pump station can be reduced, and the water delivery cost of a water department is reduced.

Furthermore, the inlet reflector 41 is embedded in the inlet end of the flow channel and is lower than the highest point of the first arch structure 20, and the outlet reflector 42 is embedded in the outlet end of the flow channel and is lower than the highest point of the second arch structure 30, so that the fluid after being rectified and accelerated is basically not disturbed, the disturbance effect of the reflector and a column type, bracket type or insertion piece type structure for supporting the reflector on the fluid is basically eliminated, the flowing state of the fluid in the flow channel is further improved, the uniformity of the fluid flow speed in the axial direction of the flow channel is improved, and the measuring accuracy of the flowmeter is further improved.

Meanwhile, after the ultrasonic reflection structure is installed in the metering pipe section, the first arch structure 20 and the slope-shaped flow guide surface narrow the flow section of the fluid, so that a reducing effect is generated, the fluid entering the flow channel of the pipe body structure 10 is accelerated, especially for the fluid with small flow, the fluid with small flow can be accelerated by the structure after the reducing to be full of the metering pipe section, and the measurement of the fluid with small flow can be well realized.

In one embodiment, as shown in FIG. 4, the first dome 20 extends about 2/5 of the entire circumference in the circumferential direction of the tubular body structure 10. The second dome 30 extends in the circumferential direction of the tubular body structure 10 over 2/5 of the entire circumference.

The inventor simultaneously performs a simulation experiment, in the simulation experiment, a left-handed vortex generator, a right-handed vortex generator and a velocity cross-section flow generator are added at the upstream of the tube structure 10 to generate a vortex, after the vortex passes through the first arch structure 20, the fluid track entering the flow passage of the tube structure 10 is basically combed into the flow track along the axial direction of the flow passage, and the difference of the velocity along the axial direction is reduced, which indicates that the first arch structure 20 and the second arch structure 30 of the embodiment better achieve the combing effect on the fluid and achieve the expected purpose.

It should be noted that the second dome 30 may be substantially identical to the first dome 20, or may be identical to the first dome, so that the ultrasound reflecting structure may be used in either side of the first dome.

In one embodiment, as shown in FIG. 2, the slope of the apex of the sloped deflector surface of the first dome 20 is preferably set to zero to provide a smooth transition between the apex and the inlet end of the flow passage. The slope of the root of the sloping flow-directing surface of the first dome-shaped structure 20 is

Wherein the angle is less than or equal to 10 degrees

Less than or equal to 60 degrees, and the section profile from the root of the slope-shaped flow guide surface to the highest point is smoothly and smoothly transited, and the slope of the section profile from the root to the highest point is from

Gradually decreasing to zero.

In a preferred embodiment of the present invention,

preferably in the range of 10 DEG-C

Is less than or equal to 45 degrees so that the transition of the first arch structure 20 is smoother, the flow passage sectional area at the flow passage inlet end of the pipe body structure 10 is gradually reduced, and the flow disorder caused by the sudden change of the flow passage sectional area is greatly reduced. Further, the air conditioner is provided with a fan,

in practice, the angle may be selected from a plurality of values such as 10 °, 15 °, 18 °, 20 °, 30 °, and the like, and a smaller value such as 10 °, 15 °, 18 °, 20 ° is preferable to make the arch structure more gentle when the condition for accelerating the flow rectification is satisfied.

It should be noted that, the edges of the inlet and the outlet of the upper half pipe 11 may be provided with a chamfer or a micro-arch structure, so that after the ultrasonic reflection structure is installed in the metering pipe section, the inlet and the outlet of the upper half pipe 11 are closely attached to the inner wall of the metering pipe section and transition is smooth, so as to reduce the obstruction to the fluid.

The inventor finds in engineering practice that if the fluid medium before entering the metering pipe section has poor flow state, such as uneven speed and turbulent flow along the radial direction of the pipe, the fluid presents uneven flow velocity distribution in the axial direction after entering the metering pipe section, and the flow track of the fluid is disordered, so that more serious energy loss is generated in the ultrasonic reflection transmission process. Although the diameter reduction in the prior art can comb the incoming flow to a certain extent, the phenomena of uneven flow velocity distribution and disordered flow track of the fluid flowing along the axis under severe conditions cannot be effectively relieved, so that the inevitable loss of ultrasonic energy is caused, and the measurement accuracy of the ultrasonic flowmeter is seriously influenced. Therefore, the inventors have further proposed the following.

In one embodiment, as shown in fig. 1, the ultrasonic reflection structure further includes a first comb structure disposed on the sloped guide surface of the first dome-shaped structure 20, and including a plurality of grooves 51, each groove 51 extending from the bottom of the sloped guide surface to the inlet end of the flow channel, and the width of each groove 51 decreases in the water flow direction.

When the fluid contacts the slope-shaped flow guide surface of the first arch-shaped structure 20, the fluid is accelerated by the first arch-shaped structure 20, and meanwhile, the first carding structure formed by the grooves 51 on the surface of the first arch-shaped structure 20 combs the incoming flow, so that the turbulent flow in the fluid in the flow states of turbulent flow, vortex flow and the like is carded into the flow along the axial direction of the pipeline as much as possible, the forced alignment and straightening of the flow track of the fluid are realized, and when the fluid enters the flow channel of the pipe body structure 10, the fluid is in the state of flowing along the axial direction, the loss of ultrasonic energy is reduced, and the measurement accuracy is improved.

In one embodiment, the trough 51 transitions smoothly, without sharp corners, at the highest point of the ramp surface of the first dome 20 to avoid secondary turbulence or swirling flow as much as possible. In addition, the molded line radian of the groove bottom and the molded line radian of the groove edge of the groove 51 are consistent with the radian of the slope-shaped diversion surface of the first arched structure 20. This means that the grooves 51 not only can comb the incoming flow but also accelerate the incoming flow as part of the first dome 20, while the grooves 51, which are aligned with the curvature of the first dome 20 in the direction of fluid flow, can reduce the secondary influence on the fluid to prevent secondary turbulence, swirling flow, etc.

In one embodiment, the groove 51 may open directly into the surface of the sloped flow guide surface of the first dome 20. Or a plurality of strip-shaped stop strips along the fluid flowing direction are arranged on the surface of the slope-shaped flow guide surface of the first arch structure 20, the strip-shaped stop strips extend from the root of the slope-shaped flow guide surface and are converged to the highest position of the slope-shaped flow guide surface, a groove 51 is formed by two adjacent strip-shaped stop strips, and the strip-shaped stop strips are smoothly connected at the highest position of the first arch structure 20.

In a preferred embodiment, a second comb structure is also provided on the ramp surface of the second dome 30, the second comb structure including a plurality of grooves 51, each groove 51 extending from the bottom of the ramp surface to the outlet end of the flow path and each groove 51 having a width that increases in the direction of the water flow.

As can be seen from the foregoing, the second dome structures 30 and the second comb structures are identical to the first dome structures 20 and the first comb structures, and are symmetrically distributed about the center of the flow path of the tube structure 10. The second arched structure 30 and the second carding structure are arranged at the outlet end of the flow channel, and the first carding structure can be used for carding and guiding the fluid discharged from the flow channel and carding the fluid in advance for monitoring a water meter and a flow meter on a downstream pipeline; secondly, because the second carding structure on the surface of the second arch structure 30 is completely the same as the first carding structure on the surface of the first arch structure 20, on one hand, the ultrasonic reflection structure can be assembled and used without dividing the positive and negative directions, on the other hand, if the direction of the fluid in the flow channel changes from the original positive flow to the reverse flow, the ultrasonic wave reflection structure can be directly used without disassembling and reversely assembling, the acceleration and carding effect of the fluid can be still ensured, the loss of ultrasonic energy is reduced, and the accurate metering is ensured.

In one embodiment, as shown in fig. 6, the flow path formed by the pipe body structure 10 includes an upper channel portion 111 having a quadrangular cross section and a lower channel portion 121 having a semicircular cross section, and the upper channel portion 111 has a width equal to the diameter of the lower channel portion 121; and the height of the highest point of the lower channel portion 121 does not exceed the height of the highest point of the first dome 20. As can be seen from the structure herein, in the flow channel of the tubular body structure 10, the upper channel portion 111 with a rectangular cross section is the main component of the flow channel, and the lower channel portion 121 occupies a small portion, which helps the fluid accelerated and combed by the first arch structure 20 and the first combing structure to mostly fill the upper channel portion 111 of the flow channel, and to a small portion fill the lower channel portion 121. The upper channel part 111 with the quadrangular cross section forms a direct current channel, the size and the shape of the channel cross section from the inlet to the outlet are basically kept unchanged, the upper channel part 111 is not bent or blocked from the inlet to the outlet, and the upper channel part 111 extends linearly along the water flow direction, so that the pressure loss is small, the fluid speed and the fluid state are more stable, the ultrasonic energy transmission is facilitated, and the energy loss is reduced.

It should be noted that the upper channel portion 111 has a chamfer structure at the corner, but can still be regarded as having a substantially quadrangular cross section, so the upper channel portion 111 having a quadrangular cross section includes the upper channel portion 111 having a substantially quadrangular cross section. The cross-sectional shape of the upper passage portion 111 is preferably rectangular or square, and may be other quadrangles such as trapezoidal.

In a preferred embodiment, as shown in fig. 2, the lower channel portion 121 is located at a lower portion of the flow path constructed by the pipe body structure 10, and the flow path sectional area of the lower channel portion 121 is not more than a half of the flow path sectional area of the upper channel portion 111, or not more than a third of the flow path sectional area, and the sectional area of the lower channel portion 121 is compressed as much as possible. Because the accelerated and combed fluid enters the upper channel portion 111 until it exits the outlet end of the flow channel at a relatively constant flow rate, but the fluid entering the lower channel portion 121, which first passes over the first arches 20 and then enters the lower channel portion 121, has a certain back flow effect when passing over the first arches 20, a slight swirling flow may be generated, and the fluid velocity in the lower channel portion 121 is less constant than the fluid velocity in the upper channel portion 111, thereby allowing the upper channel portion 111 to occupy as much of the flow channel as possible.

In a preferred embodiment, the first and

second arches

20 and 30 are integrally formed with the lower tube half 12. The upper tube half 11 defines an upper channel portion 111 and the lower tube half 12 intermediate the first arch 20 and the second arch 30 defines a lower channel portion 121.

In the foregoing, the ultrasonic reflection sheet assembly 40 includes an entrance reflection sheet 41, an exit reflection sheet 42, and an upper reflection sheet 43; the upper reflection sheet 43 is mounted on the inner wall of the upper half pipe 11 and faces the lower half pipe 12; the inlet reflector 41 is obliquely arranged at the inlet end of the lower half-pipe 12, is positioned at the downstream of the first arch structure 20 and is lower than the highest position of the first arch structure 20, and faces the upper reflector 43; the exit reflector 42 is mounted obliquely at the exit end of the lower tube half 12, upstream of the second dome 30 and below the highest point of the second dome 30, and faces the upper reflector 43. It should be noted that the inlet reflector 41 is smoothly connected to the downstream surface of the first dome 20 and the outlet reflector 42 is smoothly connected to the upstream surface of the second dome 30 to minimize the effect of the corners of the structure on the flow conditions. As shown in fig. 4, the ultrasonic beam emitted by the first transducer 200 is emitted to the entrance reflector 41, reflected to the upper reflector 43, reflected by the upper reflector 43 to the exit reflector 42, and finally reflected by the exit reflector 42 and received by the second transducer 300.

As shown in fig. 4, the entrance reflector 41, the exit reflector 42 and the upper reflector 43 form a W-shaped ultrasonic reflection path, and in combination with the upper channel portion 111 with a rectangular cross section and the lower channel portion 121 with a semicircular cross section configured in the foregoing embodiment, the ultrasonic beam passing through the lower channel portion 121 is less, and most of the ultrasonic beam passes through the upper channel portion 111 with a rectangular cross section, so that most of the ultrasonic beam is in the upper channel portion 111 with a stable flow state and a stable flow velocity, which is beneficial to improving the ultrasonic transmission quality, reducing the energy loss, and improving the measurement accuracy of the ultrasonic flowmeter.

In one embodiment, as shown in fig. 2 and 13, the upper half tube 11 of the tube body structure 10 includes a top wall 113, the top wall 113 is used for mounting the upper reflection sheet 43, the sum of the thicknesses of the top wall 113 and the upper reflection sheet 43 is H, and the ratio of the diameter of the circumference where the tube body structure 10 is located to the diameter is 0.05 to 0.20, preferably 0.08 to 0.15. It can be seen that the sum of the thicknesses of the top wall 113 of the upper half-tube 11 and the upper reflection sheet 43 is very small compared to the diameter of the entire tube section, and in practice the sum of the thicknesses of the top wall 113 and the upper reflection sheet 43 is configured to be 2mm. When the fluid flows through the upper half pipe 11, since the thicknesses of the top wall 113 and the upper reflecting plate 43 are small, the fluid is hardly blocked, and the generated turbulent flow is very slight, so that the fluid can form a relatively stable flow velocity in the extending direction of the top wall 113 of the upper half pipe 11.

Further, as shown in fig. 7, if the transducers for ultrasonic transmission and reception are not in direct contact with the fluid, due to the small thickness of the top wall 113 and the upper reflector 43, the accelerated fluid forms a relatively stable flow velocity in the extension direction of the top wall 113 in the upper half pipe 11, so as to flush the inner wall position of the corresponding metering pipe section of the transducer and the surface of the upper reflector 43, so as to prevent dirt deposition and adhesion as much as possible, so that the wall surface through which the ultrasonic beam passes is kept clean, thereby reducing the ultrasonic energy transmission loss and improving the metering accuracy.

Further, as shown in fig. 8, if the transducer for ultrasonic transmission and reception is in direct contact with the fluid, due to the small thickness of the top wall 113 and the upper reflector 43, the accelerated fluid forms a relatively stable flow velocity in the extending direction of the top wall 113 in the upper half pipe 11, so as to flush the surface of the transducer and the surface of the upper reflector 43, and prevent dirt from depositing and adhering to the surface of the transducer as much as possible, so that the surface of the transducer for transmitting and receiving ultrasonic beams and the surface of the upper reflector 43 are kept clean, thereby reducing the ultrasonic energy transmission loss and improving the metering accuracy.

In one embodiment, as shown in fig. 2, the splice seam of the upper and

lower half pipes

11 and 12 is located below the middle of the flow channel to reduce the effect of changes in fluid flow conditions caused by the splice seam on the transmission of ultrasonic waves.

It should be noted that, in one embodiment, as shown in fig. 12, the upper half pipe 11 may be provided with a protruding rib structure 112, the lower half pipe 12 may be provided with a groove structure 122, and when the upper half pipe and the lower half pipe are combined, the rib is clamped into the groove, so as to achieve the split connection of the upper half pipe 11 and the lower half pipe 12. After the upper half pipe 11 and the lower half pipe 12 are combined, ribs of the upper half pipe 11 are clamped into grooves of the lower half pipe to form a concave-convex structure, so that the splicing seams in the metering flow channel are positioned at positions below the middle part of the flow channel, the integrity of the upper flow channel is ensured as much as possible, the adverse effect of the splicing seams on fluid is reduced, and on the other hand, the structure can also better prevent the fluid from leaking through the splicing seams to influence metering.

In one embodiment, as shown in fig. 2, the split seam of the upper half-pipe 11 and the lower half-pipe 12 comprises a middle section split seam 13, the middle section split seam 13 extending from the inlet end to the outlet end of the flow passage; the mid-section split seam 13 is at a lower elevation than the uppermost of the first and

second arches

20, 30. Because the ultrasonic reflection path of the "W" shape passes through the upper channel portion 111 twice, the middle section joint 13 is lower than the highest position of the first and

second arches

20 and 30, which is equivalent to the position that the middle section joint 13 is basically located at the middle lower part of the "W" shape without the ultrasonic transmission path, so that even if the fluid flow state change is caused at the middle section joint 13, the ultrasonic transmission is not greatly influenced.

In addition, the joints of the first arch structure 20 and the upper half pipe 11 and the joints of the second arch structure 30 and the upper half pipe 11 are provided with joints, but because the joints are short and the ultrasonic waves are transmitted in the vertical direction, the joints do not affect the ultrasonic waves greatly due to the disturbance of the joints on the fluid, and therefore, the joints do not need to be configured specially.

In one embodiment, as shown in fig. 2, the height of the lowest point of the entrance and

exit reflection sheets

41 and 42 is higher than the height of the inner bottom of the lower half pipe 12 between the entrance and

exit reflection sheets

41 and 42, so that even if impurities are deposited, they are deposited in the region of the inner bottom of the lower half pipe 12 between the entrance and

exit reflection sheets

41 and 42, and are deposited on the entrance and

exit reflection sheets

41 and 42 substantially less, thereby reducing the influence of the impurities deposition on the transmission of the ultrasonic waves. Even with a small amount of deposition on the entrance and exit

reflectors

41 and 42, the accelerated fluid from the first dome 20 will substantially flush it clean.

In one embodiment, the surface of the inlet reflector 41 is flush and smoothly transitioning with the surface of the lower tube half 12 in its installed position, and the surface of the outlet reflector 42 is flush and smoothly transitioning with the surface of the lower tube half 12 in its installed position.

In one embodiment, as shown in fig. 7 and 8, the ratio of the height of the first arch 20 to the diameter of the mounting tube 100 of the metering tube segment is in the range of 0.25 to 0.5 to achieve a relatively good reduction acceleration effect.

The upper half pipe 11 and the lower half pipe 12 may be formed by integral injection molding. In the injection molding, the reflector plate is simultaneously fixed at the predetermined positions of the upper half tube 11 and the lower half tube 12 by injection molding, and then the integral injection molding is performed. As shown in fig. 11, the edges of the entrance reflector 41, the exit reflector 42 and the upper reflector 43 may be processed to have an insert structure, or have a slope structure, or have a bent edge structure, when the reflector is injection-molded with the upper half pipe 11 and the lower half pipe 12, a portion of the material wraps the insert, the bevel edge or the bent edge of the reflector, so as to ensure tight embedding. The embodiment adopts the structure as shown in fig. 11, that is, the edge of the reflector is provided with an insert structure similar to a small ear to ensure the tight inlay during injection molding. In addition, all be equipped with the locating hole on reflector plate and the pipe that corresponds thereof, the reflector plate of being convenient for is accurate positioning when moulding plastics.

According to a second aspect of the present application, as shown in fig. 7, 8 and 9, there is also provided a meter spool piece for an ultrasonic flow meter, comprising a mounting tube 100 and an ultrasonic reflection structure of the above aspects.

The upper half pipe 11, the lower half pipe 12 or both bodies are provided with guide grooves 14 facing the water outlet direction, the installation pipe 100 is internally provided with guide strips 101, and after the ultrasonic reflection structure is inserted into the installation pipe 100 along the water flow direction, the guide grooves 14 and the guide strips 101 are matched in place, so that the ultrasonic reflection structure is ensured not to rotate in the radial direction after being installed into the pipe section, and the corresponding relation between the reflection sheet and the transducer is ensured.

Meanwhile, a first transducer slot 201 for mounting the first transducer 200 is formed on the outer wall of the mounting pipe 100, and a second transducer slot 301 for mounting the second transducer 300 is formed on the outer wall of the mounting pipe 100 at a predetermined distance from the first transducer slot 201; the first transducer 200 in the first transducer slot 201 is used for transmitting ultrasonic waves to the inlet of the flow channel of the pipe body structure 10 or receiving ultrasonic waves emitted from the inlet; the second transducer 300 in the second transducer slot 301 is used for transmitting ultrasonic waves to the outlet of the fluid channel of the pipe body structure 10 or receiving ultrasonic waves emitted from the outlet.

As can be seen from the above embodiments, since the first arch structure 20 at the inlet and the second arch structure 30 at the outlet do not extend over the entire circumference of the installation tube 100, it is convenient to arrange the transducer on the outer wall of the installation tube 100, but the wall thickness of the installation transducer slot needs to be reasonably configured according to the performance and working principle of the transducer so as not to affect the transmission of the ultrasonic waves.

In one embodiment, as shown in FIG. 7, first transducer slot 201 and second transducer slot 301 may not extend through mounting tube 100 by simply controlling the wall thickness of mounting tube 100 at the slot bottom of first transducer slot 201 and second transducer slot 301. The reducing structure that first domes 20 and second domes 30 formed accelerates the fluid, guarantees that the fluid that has certain velocity of flow can wash away the surface of reflector plate and the inner wall of the installation pipe 100 that first transducer groove 201 and second transducer groove 301 correspond, effectively reduces the dirt of above-mentioned position and adheres to and deposit, and then reduces the energy loss in the ultrasonic transmission process, corresponding improvement measurement accuracy.

In one embodiment, as shown in FIG. 8, a first transducer slot 201 and a second transducer slot 301 extend through the mounting tube 100, a first transducer 200 and a second transducer 300 are mounted in the first transducer slot 201 and the second transducer slot 301, respectively, and the receiving and transmitting surfaces of the first transducer 200 and the second transducer 300 are in direct contact with the fluid inside the mounting tube 100 and the receiving and transmitting surfaces are substantially flush with the inner wall of the mounting tube 100. The reducing fluid formed by the first arched structure 20 and the second arched structure 30 is accelerated, the fluid with a certain flow velocity can flush the surface of the reflector plate and the receiving and transmitting surfaces of the first transducer 200 and the second transducer 300, dirt adhesion and deposition of the receiving and transmitting surfaces of the surface area transducer of the reflector plate are effectively reduced, further energy loss in the ultrasonic transmission process is reduced, and the measurement precision is correspondingly improved.

It should be noted that the outer walls of the first arch 20 and the second arch 30 are adapted to fit the inner wall of the mounting tube 100 of the metering tube segment, and the outer diameter of the tubular body structure 10 formed by the upper tube half 11 and the lower tube half 12 is substantially identical to the outer diameter of the mounting tube 100, and the fitting positions of the first arch 20 and the second arch 30 with the mounting tube 100 should be relatively tightly fitted.

In one embodiment, as shown in fig. 8 to 10, an elastic clip 15 is provided at a position where the upper half pipe 11 and/or the lower half pipe 12 is attached to the inner wall of the installation pipe 100, and a rebound space 16 is provided below the elastic clip 15. A clamping groove for matching with the elastic buckle 15 is arranged on the mounting tube 100. The elastic catch 15 is compressed into the rebound space 16 by the inner wall of the mounting pipe 100 before the ultrasonic reflection structure is inserted into the mounting pipe 100 in the water flow direction and before the guide groove 14 is fitted in place with the guide strip 101. After the guide groove 14 and the guide strip 101 are matched in place, the elastic buckle 15 rebounds from the rebounding space 16 to an initial state and is clamped with the clamping groove, so that the phenomenon that the ultrasonic reflection structure is retreated due to reverse fluid impact can be prevented.

Note that a first transducer slot 201 and a second transducer slot 301 are provided on the outer wall of the mounting tube 100, the first transducer slot 201 is used for mounting the first transducer 200, and the second transducer slot 301 is used for mounting the second transducer 300.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultrasonic reflection structure for installation in a metering tube segment of an ultrasonic flow meter, comprising:

a pipe body structure (10) comprising an upper half pipe (11) and a lower half pipe (12), wherein the upper half pipe (11) and the lower half pipe (12) are combined to form a flow passage for fluid to pass through, and the flow passage comprises an inlet end and an outlet end;

the first arched structure (20) is arranged at the inlet end of the flow channel, the first arched structure (20) is provided with a slope-shaped flow guide surface, the bottom side length of the slope-shaped flow guide surface is larger than the top width, the top of the slope-shaped flow guide surface is connected with the inlet end of the flow channel and is in smooth transition, and the extension of the first arched structure (20) along the circumferential direction of the pipe body structure (10) is not more than one half of the whole circumference;

the second arched structure (30) is arranged at the outlet end of the flow channel, the second arched structure (30) is provided with a slope-shaped flow guide surface, the side length of the bottom of the slope-shaped flow guide surface is larger than the width of the top of the slope-shaped flow guide surface, the top of the slope-shaped flow guide surface is connected with the outlet end of the flow channel and is in smooth transition, and the extension of the second arched structure (30) along the circumferential direction of the pipe body structure (10) is not more than one half of the whole circumference;

an ultrasonic reflection sheet assembly (40) including an entrance reflection sheet (41), an exit reflection sheet (42), and an upper reflection sheet (43), the upper reflection sheet (43) being embedded in and mounted on an inner wall of the upper half pipe (11); the inlet reflector plate (41) is embedded in the inlet end of the flow channel and is lower than the highest point of the first arch structure (20); the outlet reflector plate (42) is embedded in the outlet end of the flow passage and is lower than the highest point of the second arch structure (30); the entrance reflector (41), the exit reflector (42) and the upper reflector (43) are used for enabling the ultrasonic beam to form a W-shaped reflecting track in the flow channel;

the first carding structure is arranged on the slope-shaped flow guide surface of the first arched structure (20) and comprises a plurality of grooves (51), each groove (51) extends from the bottom of the slope-shaped flow guide surface to the inlet end of the flow channel, and the width of each groove (51) is gradually reduced along the water flow direction;

the second carding structure is arranged on the slope-shaped flow guide surface of the second arched structure (30) and comprises a plurality of grooves (51), each groove (51) extends from the bottom of the slope-shaped flow guide surface to the outlet end of the flow channel, and the width of each groove (51) increases progressively along the water flow direction.

2. An ultrasound reflecting structure according to claim 1, wherein the flow path constituted by the tube structure (10) comprises an upper channel portion (111) having a quadrangular cross section and a lower channel portion (121) having a semicircular cross section; the height of the highest point of the lower channel portion (121) does not exceed the height of the highest point of the first arch (20).

3. An ultrasound reflection structure according to claim 2, characterized in that the upper half-tube (11) constitutes the upper channel portion (111) and the lower half-tube (12) intermediate the first arch (20) and the second arch (30) constitutes the lower channel portion (121).

4. An ultrasound wave reflecting structure according to claim 3, wherein the upper half pipe (11) of the pipe body structure (10) comprises a top wall (113), the top wall (113) is used for mounting the upper reflecting sheet (43), and the ratio of the sum of the thicknesses of the top wall (113) and the upper reflecting sheet (43) to the diameter of the circumference of the pipe body structure (10) is 0.05 to 0.20.

5. An ultrasound reflecting structure according to any of claims 1-4, wherein the joint of the upper half-tube (11) and the lower half-tube (12) is at a position below the middle of the flow channel;

the splicing seams of the upper half pipe (11) and the lower half pipe (12) comprise middle section splicing seams (13), and the middle section splicing seams (13) extend from the inlet end to the outlet end of the flow channel;

the height of the middle section split seam (13) is lower than the highest of the first arch structure (20) and the second arch structure (30).

6. An ultrasound wave reflecting structure according to claim 4, characterized in that the height of the lowest of the entrance reflector sheet (41) and the exit reflector sheet (42) is higher than the height of the inside bottom of the lower half pipe (12) between the entrance reflector sheet (41) and the exit reflector sheet (42).

7. A meter spool piece for an ultrasonic flow meter, comprising a mounting tube (100) and the ultrasonic reflection structure of any of claims 1-6;

a guide groove (14) facing the water outlet direction is formed in the upper half pipe (11) and/or the lower half pipe (12), a guide strip (101) is arranged in the installation pipe (100), and after the ultrasonic reflection structure is inserted into the installation pipe (100) along the water flow direction, the guide groove (14) and the guide strip (101) are matched in place;

a first transducer groove (201) for mounting a first transducer (200) is formed in the outer wall of the mounting pipe (100), and a second transducer groove (301) for mounting a second transducer (300) is formed in the outer wall of the mounting pipe (100) at a preset distance from the first transducer groove (201);

the first transducer (200) in the first transducer slot (201) is used for transmitting ultrasonic waves to the inlet of the flow channel of the pipe body structure (10) or receiving ultrasonic waves emitted from the inlet;

the second transducer (300) in the second transducer slot (301) is used for transmitting ultrasonic waves to the outlet of the flow channel of the pipe body structure (10) or receiving ultrasonic waves emitted by the outlet.

8. The metering pipe section according to claim 7, characterized in that an elastic snap (15) is arranged at the position where the upper half pipe (11) and/or the lower half pipe (12) is attached to the inner wall of the mounting pipe (100), and a rebound space (16) is arranged below the elastic snap (15);

a clamping groove used for being matched with the elastic buckle (15) is formed in the mounting pipe (100);

the elastic buckle (15) is compressed into a rebound space (16) by the inner wall of the installation pipe (100) before the ultrasonic wave reflection structure is inserted into the installation pipe (100) along the water flow direction and the guide groove (14) is matched with the guide strip (101) in place;

after the guide groove (14) and the guide strip (101) are matched in place, the elastic buckle (15) rebounds from the rebounding space (16) to an initial state and is clamped with the clamping groove.

9. An ultrasonic flow meter comprising a meter section according to claim 7 or 8.