CN111623838A - Measuring section structure and method of ultrasonic measuring device - Google Patents
Measuring section structure and method of ultrasonic measuring device Download PDFInfo
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- CN111623838A CN111623838A CN202010661478.4A CN202010661478A CN111623838A CN 111623838 A CN111623838 A CN 111623838A CN 202010661478 A CN202010661478 A CN 202010661478A CN 111623838 A CN111623838 A CN 111623838A
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- measuring
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- measuring section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/10—Preventing damage by freezing or excess pressure or insufficient pressure
- G01F15/105—Preventing damage by hydraulic shocks
Abstract
The invention relates to a measuring section structure and a measuring method of an ultrasonic measuring device, which are used for measuring a flowing medium, in particular to an ultrasonic measuring structure of liquid or gas, and belong to the technical field of acoustics and sensing. The technical scheme is as follows: the ultrasonic measuring device is arranged in the middle of the ultrasonic measuring device, and comprises shells at two ends and a measuring section in the middle; the cross section of the inner hole of the measuring section is elliptical or elliptical-like, and an elliptical or elliptical-like flow passage is formed. The invention has the beneficial effects that: the technical bias in the field is overcome, and the shape of the inner hole of the measuring section is changed, and the reflector adopts the shape matched with the inner hole, so that the vortex disturbance flow interference is reduced and eliminated, and the measuring accuracy is improved.
Description
Technical Field
The invention relates to a measuring section structure and a measuring method of an ultrasonic measuring device, which are used for measuring a flowing medium, in particular to an ultrasonic measuring structure of liquid or gas, and belong to the technical field of acoustics and sensing.
Background
At present, the existing ultrasonic flow sensor structure, especially the small-caliber ultrasonic flow sensor (the inner diameter is less than 40 mm), usually adopts the mode of reflecting ultrasonic waves by a reflector to measure, the reflector reflects the ultrasonic waves to penetrate through the fluid to be measured, and the time difference of forward and backward strokes is calculated so as to calculate the flow velocity information. The ultrasonic flow sensor structure in the prior art is generally composed of a measuring section in the middle and shells at two ends, an inner hole of the measuring section in the middle is round, a round overflowing channel is formed, reflectors are arranged in the shells at two ends of the measuring section, sensors are arranged on the shells, and the two sensors, the two reflectors and the middle round overflowing channel form a U-shaped measuring path to realize the metering of fluid. The prior art has the following problems: because the measuring section hole all is the orthocircular form, receives vortex disturbance easily, when the fluid that is surveyed receives certain disturbance, can lead to the velocity of flow center to take place the skew, for example the vortex or the velocity profile type vortex stipulated in the water gauge standard, if the ultrasonic wave route of reflector reflection does not pass fluid velocity of flow center, the distortion will take place for the measured data to arouse the measuring error of water gauge. The usual practice facing this problem is: 1. install fairing additional in water gauge upper reaches, for example straightener to make on fluid earlier stabilizes the ultrasonic measurement route at velocity of flow center before getting into the water gauge, because ultrasonic measurement device's rectification structure all need set up alone in addition, the structure is more complicated, and the processing equipment is also very loaded down with trivial details. 2. The reflector is enlarged so that the reflected ultrasonic area covers all of the measured fluid, but this greatly increases the pressure loss of the meter.
Disclosure of Invention
The invention aims to provide a measuring section structure and a measuring section method of an ultrasonic measuring device.
The technical scheme of the invention is as follows:
a measuring section structure of an ultrasonic measuring device is arranged in the middle of the ultrasonic measuring device, and the ultrasonic measuring device comprises shells at two ends and a measuring section in the middle; the cross section of the inner hole of the measuring section is elliptical or elliptical-like, and an elliptical or elliptical-like flow passage is formed.
The shell and the measuring section are both in a cylindrical shape, and a combined structure or an integrated structure is arranged between the shell at two ends and the measuring section in the middle.
A reflector is arranged in the shell, and the shape of the reflector is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; for example: rectangular mirrors, elliptical or elliptical-like mirrors, right circular shaped mirrors, etc. are used. The sensor is arranged on the shell and corresponds to the reflector in a matching mode, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path.
Two side edges of the reflector are connected with the shell and are integrally formed with the shell.
The reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined with each other, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel.
The measuring section is a reduced part positioned between the two shells, and the sectional area of an inner hole of the measuring section is smaller than that of the inner hole of the shell; the water passing part in the measuring section is an elliptical hole or a similar ellipse, the measuring section is an independent part, and two ends of the measuring section are combined with the two shells to form an ultrasonic measuring structure; the combination mode comprises the following steps: fastening, bonding, inserting, buckling and the like.
The shell is provided with a rectifying structure and is integrally formed with the shell.
The integral molding is injection molding integral molding.
A measuring method of an ultrasonic measuring device is characterized in that the cross section of an inner hole of a measuring section in the middle of the ultrasonic measuring device is elliptical or similar to elliptical to form an elliptical or similar elliptical flow passage; the shape of a reflector of the ultrasonic measuring device is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; the reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined together, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel; the sensor is arranged on the shell, the sensor is matched and corresponds to the reflectors, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path to realize fluid measurement.
The invention has the main innovation points that: the cross section of the inner hole of the measuring section in the prior art is round, and the cross section of the inner hole of the measuring section is oval or similar oval, so that vortex turbulence interference is reduced and eliminated, and the measuring accuracy is improved.
There has been a long-standing technical prejudice in the art (ultrasonic meters): the accurate measurement can be realized only if the inner hole of the measuring section is of a perfect circle and the generated flow passage is of a perfect circle, so that the inner holes of the measuring sections of all the ultrasonic measuring instruments are of the perfect circle, and a technical bias is formed. However, in practice, it is found that the flow passage formed by the inner hole of the right circular measuring section can generate vortex disturbance, and the measurement accuracy is influenced. According to the principle of rotational flow, in the flow passage formed by the inner hole of the circular measuring section, because the circular flow passage is circumferentially symmetrical, vortex disturbance can freely develop and diffuse in the circular flow passage, because the flow disturbing piece is arranged at the upstream of the measuring section, secondary flow superposed on the axial main flow can be generated, and the secondary flow flows perpendicular to the axial flow, so that the metering of the ultrasonic instrument can be influenced. The overflowing channel formed by the oval or quasi-oval hole is in a non-circular symmetrical shape, so that vortex disturbance can be inhibited by the circumference of the oval or quasi-oval overflowing channel; the oval or quasi-oval flow passage compresses the height of the flow passage under the condition of the same flow area, so that secondary flow is inhibited, and the flow can be recovered to the main flow direction more quickly than that of a perfect circle flow passage.
The invention has the beneficial effects that: the technical bias in the field is overcome, and the shape of the inner hole of the measuring section is changed, and the reflector adopts the shape matched with the inner hole, so that the vortex disturbance flow interference is reduced and eliminated, and the measuring accuracy is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic view of a reflector structure according to an embodiment of the present invention;
FIG. 4 is a schematic, partially reduced cross-sectional view of an embodiment of the present invention;
FIG. 5 is a schematic diagram of the inner hole of the reduced portion of the reflector according to the embodiment of the present invention;
FIG. 6 is a flow diagram of a flow passage in a prior art measurement section;
FIG. 7 is a flow diagram of a flow passage in a measurement section according to the present invention;
FIG. 8 is a comparison of an elliptical hole measuring section of the present invention and a circular hole measuring section of the prior art;
in the figure: the device comprises a first rectifying structure 1, a first shell 2, a first sensor mounting hole 3, a measuring section 4, a second shell 5, a second sensor mounting hole 6, a second sensor mounting hole 7, a second reflector 8, an inner hole 9 and a first reflector 10.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A measuring section structure of an ultrasonic measuring device is arranged in the middle of the ultrasonic measuring device, and the ultrasonic measuring device comprises shells at two ends and a measuring section 4 in the middle; the cross section of the inner hole 9 of the measuring section is elliptical or elliptical-like, and an elliptical or elliptical-like flow passage is formed.
The shell and the measuring section are both in a cylindrical shape, and a combined structure or an integrated structure is arranged between the shell at two ends and the measuring section in the middle.
A reflector is arranged in the shell, and the shape of the reflector is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; for example: rectangular mirrors, elliptical or elliptical-like mirrors, right circular shaped mirrors, etc. are used. The sensor is arranged on the shell and corresponds to the reflector in a matching mode, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path.
Two side edges of the reflector are connected with the shell and are integrally formed with the shell.
The reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined with each other, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel.
The measuring section is a reduced part positioned between the two shells, and the sectional area of an inner hole of the measuring section is smaller than that of the inner hole of the shell; the water passing part in the measuring section is an elliptical hole or a similar ellipse, the measuring section is an independent part, and two ends of the measuring section are combined with the two shells to form an ultrasonic measuring structure; the combination mode comprises the following steps: fastening, bonding, inserting, buckling and the like.
The shell is provided with a rectifying structure and is integrally formed with the shell.
The integral molding is injection molding integral molding.
A measuring method of an ultrasonic measuring device is characterized in that the cross section of an inner hole of a measuring section in the middle of the ultrasonic measuring device is elliptical or similar to elliptical to form an elliptical or similar elliptical flow passage; the shape of a reflector of the ultrasonic measuring device is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; the reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined together, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel; the sensor is arranged on the shell, the sensor is matched and corresponds to the reflectors, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path to realize fluid measurement.
The casing is provided with a rectifying structure, the rectifying structure comprises a notch 1 and a convex edge 7, the notch 1 is arranged at the end part of the casing, the convex edge 7 is longitudinally arranged on the inner wall of the end part of the casing, the notch 1 and the convex edge 7 are arranged in a staggered manner on the circumference of the end part of the casing, and the casing, the notch 1 and the convex edge 7 are integrally formed; the shape of the notch is arbitrary, and comprises a strip-shaped groove, a U-shaped groove, a V-shaped opening, a semicircular opening and the like. The quantity of notch is arbitrary, and a plurality of notches all set up the tip at the casing, and the shape of a plurality of notches can be the same, also can be different. The cross-sectional shape of the convex edge is arbitrary, including rectangular, square, trapezoidal, semicircular, and the like. Protruding stupefied and casing integrated into one piece, protruding stupefied quantity is arbitrary, and a plurality of protruding stupefied all sets up on the tip inner wall of casing, and a plurality of protruding stupefied shapes can be the same, also can be different.
In the embodiment, the number of the shells is two, namely a shell I2 and a shell II 5; the number of the rectification structures is two, and the rectification structures are a rectification structure I and a rectification structure II respectively; the number of the reflectors is two, namely a reflector I10 and a reflector II 8; the first shell 2 is provided with a sensor mounting hole 3, a first rectifying structure and a first reflector 10, and the second shell 5 is provided with a sensor mounting hole 6, a second rectifying structure and a second reflector 8.
The cross section of the inner hole 9 of the measuring section is elliptical or elliptical-like, and an elliptical or elliptical-like flow passage is formed. The reflector is arranged in the shell, the shape of the reflector is consistent with that of an ellipse or a similar ellipse of an inner hole of the measuring section, and the ellipse or the similar ellipse reflector is adopted.
The technical effect of the invention is verified by experimental comparison.
The sensor with the inner hole of the measuring section being the elliptical hole is arranged in the pipe body of the measuring pipe section, and compared with the sensor with the inner hole of the measuring section being the perfect circular hole in the prior art. The following flow verification is carried out through the flow verification standard device test: 10L/h, 16L/h, 25L/h, 32L/h, 50L/h, 80L/h, 120L/h, 160L/h, 320L/h, 450L/h, 880L/h, 1300L/h, 2000L/h, 2500L/h and 4000L/h, and the original flow error trend is obtained, and specific test data are shown in the attached figure 8.
FIG. 8 is a comparison of an elliptical hole measuring section of the present invention and a circular hole measuring section of the prior art; the original flow error curve before correction needs polynomial fitting on the curve, so that the linearity of the curve corresponding to the elliptical hole measuring section is superior to that of the circular hole measuring section in the prior art, and the accuracy is higher than that of the circular hole measuring section after fitting correction.
The sensor with the inner hole of the measuring section being the elliptical hole is arranged in the pipe body of the measuring pipe section, and compared with the sensor with the inner hole of the measuring section being the perfect circular hole in the prior art. The flow is set to 4m through the test of a flow verification standard device3And h, setting vortex turbulence or speed profile type turbulence specified in a water meter standard at different straight pipe section distances in front of the meter, such as 10D, 5D, 3D and 0D, wherein D is the pipe diameter, and testing the turbulence resistance of the invention and the prior art. Specific test data are shown in the following table:
test data show that the anti-turbulence performance of the elliptical hole measuring section is superior to that of a normal circular hole in the prior art, the accuracy requirement of level 1 can be still met after a disturbance test, and the accuracy requirement of level 2 can only be met by the normal circular hole in the prior art.
The invention overcomes the technical prejudice in the field and has the advantages of novel structure, low pressure loss, convenient assembly process, strong anti-interference flow function, high measurement precision and the like.
Claims (5)
1. The utility model provides an ultrasonic measuring device's measurement section structure which characterized in that: the ultrasonic measuring device is arranged in the middle of the ultrasonic measuring device, and comprises shells at two ends and a measuring section in the middle; the cross section of the inner hole of the measuring section is elliptical or elliptical-like, and an elliptical or elliptical-like flow passage is formed.
2. The measurement section structure of an ultrasonic measurement apparatus according to claim 1, wherein: the shell and the measuring section are both in a cylindrical shape, and a combined structure or an integrated structure is arranged between the shell at two ends and the measuring section in the middle.
3. The measurement section structure of an ultrasonic measurement apparatus according to claim 1 or 2, wherein: a reflector is arranged in the shell, and the shape of the reflector is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; the sensor is arranged on the shell and corresponds to the reflector in a matching mode, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path.
4. The measurement section structure of an ultrasonic measurement apparatus according to claim 3, wherein: the reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined with each other, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel.
5. A measuring method of an ultrasonic measuring apparatus, characterized in that: the cross section of an inner hole of a measuring section in the middle of the ultrasonic measuring device is elliptical or similar to elliptical, so that an elliptical or similar elliptical flow passage is formed; the shape of a reflector of the ultrasonic measuring device is matched with the ellipse or the similar ellipse of the inner hole of the measuring section; the reflector is in an oval or rectangular shape with a long axis and a short axis, and two side edges of the reflector are connected with the shell and integrally formed with the shell; the cross section of the inner hole of the measuring section is in an ellipse or similar ellipse with a long axis and a short axis, two shells and one measuring section are combined together, the reflecting direction of a reflector in the shell is consistent with the central line direction of the inner hole of the measuring section, and the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged in parallel; the sensor is arranged on the shell, the sensor is matched and corresponds to the reflectors, and the two sensors, the two reflectors and the middle elliptical or similar elliptical flow passage form a U-shaped measuring path to realize fluid measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661478.4A CN111623838A (en) | 2020-07-10 | 2020-07-10 | Measuring section structure and method of ultrasonic measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661478.4A CN111623838A (en) | 2020-07-10 | 2020-07-10 | Measuring section structure and method of ultrasonic measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN111623838A true CN111623838A (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010661478.4A Pending CN111623838A (en) | 2020-07-10 | 2020-07-10 | Measuring section structure and method of ultrasonic measuring device |
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| CN (1) | CN111623838A (en) |
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2020
- 2020-07-10 CN CN202010661478.4A patent/CN111623838A/en active Pending
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