CN116222675A - Large-caliber multichannel ultrasonic water meter with flange transducer layout - Google Patents

Abstract

The invention belongs to the technical field of flow metering equipment, in particular relates to a large-caliber multichannel ultrasonic water meter with a flange transducer layout, and aims to solve the problem that the effective sound range maximization, namely the range ratio maximization of a flowmeter, cannot be realized by installing a pair of opposite transducers in the oblique insertion mode of the transducers of the conventional various ultrasonic large-caliber water meters; the technical scheme of the invention is that an L-shaped transducer is provided, the sealing fixed end of the L-shaped transducer is arranged in a flange, the functional end of the L-shaped transducer is arranged in a transducer pair perforation on a lining, a novel lining structure is constructed, and a multichannel ultrasonic transducer layout structure is adopted in two flanges, so that an ultrasonic water meter with a complete structure is formed, the structure is simple, the cost is low, the performance is high, the safety and the reliability are realized, and the measurement of the ultrasonic water meter with maximized range ratio, minimized starting flow and high precision under the given pipe diameter of a given length is realized.

Description

Large-caliber multichannel ultrasonic water meter with flange transducer layout

Technical Field

The invention belongs to the technical field of flow metering equipment, and particularly relates to a large-caliber multichannel ultrasonic water meter with a flange transducer layout.

Background

In the era of big data of the internet of things, artificial intelligence and industrial automatic control, the full-electronic mode flowmeter gradually replaces a mechanical or electromechanical combined mode flowmeter for the field of raw water, heat and gas supply metering of industry and people, and the full-electronic mode flowmeter has become an irreversible big trend.

According to the requirements of practical application, the fluid metering industry or occasion expects to be compatible with standard flow metering devices with various caliber specification ranges, low pressure loss, high precision, high reliability, no abrasion devices, durability and economy. Currently, the most widely used all-electronic flow meters worldwide are electromagnetic flow meters and later-appearing ultrasonic flow meters.

The ultrasonic flowmeter is raised by technological breakthroughs of time difference timing chips (2012-2017, international companies such as AMS, D-FLOW and TI, etc.) which are advanced in sequence, and at present, the resolution of the ultrasonic flowmeter is up to 5-10 ps, so that the water metering application requirements are completely met. In contrast to electromagnetic flowmeters, ultrasonic flowmeters are sampled by time lapse digital signals (whereas electromagnetic flowmeters are sampled by analog signals). Taking an ultrasonic water meter as an example, the ultrasonic water meter has outstanding technical advantages: smaller initial flow (such as liquid with a measurable flow rate of 0.8-1 mm/s), wider measuring range ratio, capacity of actively measuring process time difference by sound waves, conversion into fluid flow rate and temperature and synchronously compensating the measured volume change (for which, a thermometer needs to be installed on an electromagnetic flowmeter), higher precision and safety of large-caliber multichannel measurement (the electromagnetic flowmeter only has a pair of coils and corresponding electrodes, and is scrapped after coil faults), capability of measuring various low-viscosity liquids (the electromagnetic flowmeter cannot measure low-conductivity liquid such as purified water), and capability of measuring/measuring gases such as fuel gas (the electromagnetic flowmeter cannot measure gas flow).

The technical development direction and principle of the upgrading and improvement of the ultrasonic water meter need to be clearly defined. In general, the performance index of the flowmeter is metering precision and measuring range ratio, the metering precision is the ratio of the flowmeter value of the flowmeter to the actual value of the flow, and the improvement of the fluid flow stability and the consistency of mass production are important conditions for determining the metering precision; the range ratio is the ratio of the common flow to the minimum flow under the guarantee of the metering precision of the flowmeter, the range capable of being precisely metered is embodied, and the increase of the effective distance between the ultrasonic transducers is a necessary condition for improving the range ratio. Obviously, the higher the metering accuracy and the larger the measuring range ratio, the better the metering performance of the flowmeter.

In recent years, the metering industry has greatly improved the practical application of ultrasonic flow meters. In addition to the time difference integrating circuit, the ultrasonic flowmeter has transducer, transducer layout mode, flow channel structure, etc. the former has performance determining the minimum flow rate, and the latter has overall structure determining the comprehensive performance and quality of the ultrasonic flowmeter. Taking a water meter as an example, particularly according to the constraint of a new water meter standard, the technical development direction of the ultrasonic water meter is defined in the industry, and the technical guidelines are summarized as follows:

(1) Sound path maximization principle: in order to make the ultrasonic water meter have a large measuring range ratio, for large caliber flow meters, especially ultrasonic water meters, an acoustic path maximization mode between ultrasonic transducers should be adopted. Because for water meters, the wide scale ratio is an extremely important index for trade settlement, and is also the most important technical index for water meters, this is quite different from industrial flow meters. For example, at a production facility, the water usage at day time is 500 times the water usage at night, if the meter turndown ratio is low (e.g., turndown ratio

200), then the metering of the night time small flow water usage segment must be omitted to balance the metering of the daytime large flow segment. In other words, the flowmeter may not meter or have a large metering error (the metering accuracy value is biased to be negative, such as the current rotary-wing mechanical water meter) under the condition of small flow, which inevitably causes metering loss of the water supply party. In order to make the ultrasonic water meter have a large range ratio and achieve fair trade settlement, the projection distance of the two transducer spacing connecting lines of the ultrasonic water meter in the water flow direction in the main pipe should be maximized so as to obtain a larger range ratio and smaller starting flow.

The relationship between the range ratio and the transducer spacing of the ultrasonic flowmeter is deduced as follows:

In the field of water metering, the range ratio

Defined as->

Wherein->

The flow is a given value corresponding to the common flow under a certain pipe diameter; />

To meet the minimum flow rate required by a certain metering accuracy (for example, the metering accuracy of the secondary flowmeter is +/-5%).

An important conclusion is reached by the following in-depth analysis and deduction: for fluids passing through the flow meter conduit, the measured pick-up flow (i.e., the minimum flow that the flow meter perceives to be measured)

The lower (corresponding to its flow rate +.>

The lower and +.>

Related to the resolution of the time difference chip of the ultrasonic flowmeter and the pipeline structure of the flowmeter), corresponding to the resolution of the time difference chip and the pipeline structure of the ultrasonic flowmeter, the ultrasonic flowmeter is +.>

Is also proportionally lower (i.e. the corresponding minimum flow rate +.>

It becomes lower). Typically, in practice, the empirical values are

（/>

The total zero drift generated by the ultrasonic flowmeter circuit and the transducer and the water resistance design of the flowmeter pipeline are different). Thus, it is possible to derive a flow rate at a certain caliber (flow through the flow meter line +.>

And->

The time intervals used are equal), the measuring range ratio +.>

Distance from two transducers->

The relation between the two is:

in the above-mentioned method, the step of,

is the common flow of a certain caliber flowmeter>

Is->

Flow rate of fluid in corresponding flow meter line, +. >

To meet the minimum flow rate required by a certain metering accuracy, < > for>

Is->

The corresponding flow rate of the fluid in the flow meter pipeline is +.>

And->

Is constant (selected value),>

is of circumference rate>

Is the inner radius of the flow meter conduit,

for metering, add>

For the distance between the opposite surfaces of two transducers in the pipeline of the ultrasonic flowmeter->

Is the included angle (++) between two transducers connected with the water flow direction of the flowmeter pipeline>

Acute angle, when->

When the water flows, the connecting line of the two transducers is consistent with the water flow direction,

,/>

for a known quantity related to the measurement time difference, the speed of sound of the flowmeter>

For a known quantity related to the measurement time difference, the sound velocity of the flowmeter, let +.>

=/>

Is constant and ∈>

Calculating +.>

Derived, i.e

Thus, in the concrete calculation, +.>

According to->

Substitution. From above->

The relation of (2) can be concluded as follows:

increasing the projected distance between two transducers in the flow direction of the flowmeter pipeline

The measuring range ratio of the flowmeter can be effectively improved>

(for water meter, china national standard increased the maximum value of the measuring range ratio or the flow ratio to +.>

=1000）。

(2) The opposite-emission type installation principle between transducers: the opposite-emission type acoustic wave signals are directly transmitted and received by a pair of transducers, so that the effective signal amplitude is strongest. The large-caliber flowmeter has larger size, and in order to ensure the signal receiving intensity, the transducer should be in a correlation type installation mode. In the case of the acoustic wave reflection type installation mode of the transducer, the energy loss is transmitted by the acoustic wave reflection due to one or a plurality of reflecting surfaces (when the reflecting surfaces are large enough, the acoustic energy loss of the reflecting surfaces in an ideal state is 10-20 percent, and the measurement is not affected generally), and particularly when the reflecting surfaces have angle deviation or scale is formed after the use, the energy loss can reach 40-60 percent, which seriously affects the normal measurement. Therefore, in recent years, the large-caliber flowmeter basically eliminates the sound wave reflection receiving and transmitting modes among transducers.

(3) Multi-channel principle: in order to make the large-caliber ultrasonic water meter have high metering accuracy and reliability, the large-caliber ultrasonic water meter should adopt a multichannel mode (i.e. a plurality of groups of transducers). This is because, in the correlation multichannel transducer mode, not only can the fluid be calculated separately at different levels in the pipeline, but also the measurement accuracy and accuracy can be improved, and the multichannel is an important guarantee for the measurement reliability (if the exciting coil of the electromagnetic flowmeter is disconnected, the flowmeter will be scrapped, and the multichannel ultrasonic flowmeter can perform flow measurement even if one or more pairs of transducers are damaged, so long as a pair of work is reserved).

(4) Inner tube wall integrity principles: to improve the metering accuracy of an ultrasonic flow meter and reduce the fluid resistance in the flow path of the flow meter, the inner tube wall of the flow path of the flow meter should have integrity. The surface of the flow channel of the flowmeter has a concave-convex structure due to the installation of the transducer, so that fluid turbulence can be generated, and the measurement accuracy deviation of small flow is larger (the fluid turbulence flows are large for the flowmeter and the measurement of the small flow is influenced, and the small flow is influenced more), so that the measuring range ratio of the flowmeter is low and the consistency of the flowmeter is poor.

(5) Advanced manufacturing process principle: in order to reduce the manufacturing cost and facilitate the manufacturing, an excellent manufacturing process is adopted, so that the large-caliber ultrasonic water meter has high metering precision, consistency and reliability. The pipe section of the flowmeter is manufactured by adopting a casting process with high cost, complex manufacturing flow and low precision, and the finished pipe section formed by stretching or forging is welded, processed and manufactured as far as possible. Because the pipe section manufactured by the casting process has the advantages of high cost, relatively thick pipe wall (thin pipe wall is not easy to cast and easy to have sand holes), relatively large difference of consistency of the inner diameter of the pipe (when the pipe is contracted, the inner hole is difficult to process), and the large-caliber flow calibration is labor-consuming and time-consuming, and each flowmeter base table needs to be independently corrected and compensated.

(6) Low pressure loss principle: the flow meter channel is not reduced as much as possible, so that the fluid pressure loss in the flow meter channel is avoided. In order to overcome the disadvantages of short sound path, i.e. low range ratio, many current oblique plug-in flow meters are reduced in diameter, and some flow meters are even made into flat cavities, such as patent grant publication number CN 202083425U, so as to increase the relative flow rate (because the minimum effective time difference calculated by a time difference chip is a fixed value, in order to obtain effective calculation, when the minimum value is not reached, the flow rate is increased, and the time difference can be increased), so that besides the pressure loss of the flow meter is increased, the flow rate in common use is brought about

Or overload flow->

When the flow rate of the fluid is too high due to excessive diameter reduction, water whitening phenomenon (that is, a small part of water is vaporized by the flow passage) is generated, and as a result, the flow meter stops metering (the sound velocity of the gas-containing water is greatly reduced, and the time difference value is disturbed), which is why many large-caliber ultrasonic water meters cannot meter under the condition of large flow rate.

(7) Consistency principles; the large-caliber flowmeter tube body and the transducer are installed, namely the flow channel machining and the transducer assembly installation process have higher precision and consistency (the cast tube body cannot achieve high consistency), the quality of mass production of the flowmeter is determined, and the level of the flow meter grade and whether time and labor are saved during calibration are determined.

(8) Tube sealing safety principle: when the large-caliber ultrasonic flowmeter is used for solving the problem of sealing a pipe body, the sealing ring with the same large size as the pipe diameter is adopted, so that the installation difficulty is high, and hidden danger exists in the sealing effect. Therefore, the sealing ring with smaller size is adopted as much as possible, so that the reliability and durability of the sealing are ensured.

(9) Suitability principle: the pressure sensor and the temperature sensor are conveniently configured (adapt to different applications such as heat supply metering and gas metering) so as to be suitable for metering of mass flow or metering of heat supply and natural gas delivery and distribution.

(10) Simple structure, convenient assembly principle: the structure is simplified, and the unique certainty is installed, so that the whole flowmeter is easy to assemble, and the flowmeter can be ensured to be stable and reliable and has high consistency.

The prior art still has defects or shortcomings in comparison with ten technical guidelines of the ultrasonic water meter.

The technical performance of the ultrasonic water meter is metering precision and measuring range ratio, and the determining factors of the metering precision and the measuring range ratio are the placement mode of the ultrasonic transducer and the integrity of a flow passage of the flowmeter.

The oblique insertion type transducer of the ultrasonic water meter is arranged, the sound path is short, the sound channels are few, and the requirements on the processing precision of the oblique holes are high: if the patent grant publication number CN 201993129U is obliquely inserted, the projection distance of the connecting line of the two transducers in the water flow direction in the pipe section is very short and is not in accordance with the technical guideline (1); in addition, when the caliber is smaller, the outer end of the pipe is provided with no space for arranging more sound channels, which is not in accordance with the technical guideline (3); the flow channel is internally provided with a convex part of the transducer, which is not in accordance with the technical guideline (4), has high requirements on the angle of the inclined hole for installing the transducer, deviates from a tiny angle, and greatly reduces the receiving intensity of the sound wave, thus having great processing difficulty.

Compared with oblique insertion type, the column type transducer of the ultrasonic water meter has the advantages that the sound path is prolonged, the sound channel number is more than that of the oblique insertion type transducer, and the installation is convenient, such as patent grant publication number CN 208921195U. However, the columnar transducer mounting structure arranges the columns at two sides of the pipeline, and because the correlation mode of the connecting lines between the transducers also has an included angle with the water flow direction, in order to ensure the smoothness of the channels of the pair of opposite transducers, the inner wall of the pipe body channel with larger width has to be cut off, so that the internal flow channel is damaged (as shown in the figure 3 of the patent); as another example, patent publication number CN 202770480U, fig. 2, which will The transducer mounting column protrudes from the surface of the flow channel (the transducer column protrudes, but the flow channel at the transducer position still has larger concave), the concave-convex of the flow channel generates turbulent flow when the flow velocity is low, the result is unstable flow of small flow, low measurement precision of the flowmeter, and minimum flow of the flowmeter meeting certain measurement precision requirement

The effect is greater, thereby reducing the turndown ratio of the flowmeter, which is inconsistent with technical guideline (4). The column type installation mode is more serious than the oblique insertion type installation mode in terms of the damage degree of the inner wall of the corresponding runner; in addition, the mode can only be cast and formed at present, and has low efficiency, poor consistency and higher cost, which is not in compliance with the technical guideline (5).

The arrangement of the lining oblique insertion type transducer of the ultrasonic water meter is a newer mode, and compared with the former two modes, the application publication number CN 111121895A is improved in the number of sound channels, sound path, channel integrity and shell manufacturing convenience (the lining oblique insertion type transducer can be directly welded and formed by a finished pipe without casting). However, this mode also has drawbacks: because the transducer is arranged on the lining, the two sides of the transducer are annularly arranged, if the transducer is directly packaged on the lining, the hole sites of the transducer are distributed in a large bevel angle and in an annular shape, so that the packaging difficulty is high, and if individual packaging fails, the whole tube is scrapped (the transducer packaging process has the advantages of more technical steps, high difficulty and high requirement, and the packaging in a large-volume part is difficult to realize); if the independent transducers are used for discrete installation, the thickness of the lining is limited, the inclination of the holes is large, the space is narrow, and the sealing and fixing are difficult. And because the thickness of the mounting lining of the transducer is limited, the inclination of the mounting hole of the correlation transducer is larger, the hole edge is thinner and the mounting space is more limited along with the pulling of the distance between the transducers, so that the distance between a pair of transducers cannot be pulled to the maximum under the condition of limited pipe length, and the opposite sound path cannot be maximized. The mode shown in the patent adopts a large sealing ring with the same inner diameter as the pipe to seal the inner side of the inner liner and the inner side of the metal pipe, so that the durability and the safety cannot be ensured, and the mode is not in accordance with the technical guideline (9). The solution is to seal the integral lining with the inner side of the tube sleeve, so that if a temperature or pressure sensor is to be installed on the tube, a certain difficulty exists, which is contrary to the technical guideline (10).

From the analysis, it can be seen that, among the three placement modes of the oblique insertion type transducer placement mode, the upright type transducer placement mode and the lining oblique insertion type transducer placement mode, the lining oblique insertion type transducer placement mode has better performance, and has the remarkable advantages that: (1) The metal fixing part of the transducer is not required to be arranged (cast or welded) on the outer side of the tube sleeve of the flowmeter like the inclined insertion type transducer arranging mode or the upright column type transducer arranging mode; (2) More transducers are conveniently distributed as much as possible to form more sound channels, so that the metering precision is improved; (3) Different from the column type transducer arrangement mode, the inner wall of the flowmeter tube is complete, which is beneficial to improving the metering precision of small flow, namely improving the range ratio; (4) The flowmeter base meter is formed by welding pipe sections without using a casting method or the like with high cost.

But the liner tilt-plug transducer placement mode also has a fatal disadvantage: namely, as described in patent publication CN 111121895A, when the transducers are mounted on the inner liner and the two sides are arranged in a ring shape, and independent transducers are separately mounted, because the thickness of the inner liner is limited (limited by the positions of the mounting holes of the flange bolts), if the distance between the pair of opposite transducers is pulled, the inclination of the holes becomes large, the hole wall is thin, the space is narrow, and the sealing, positioning and fixing of the transducers are difficult. Therefore, due to the thickness limitation of the inner liner, when the distance between the transducers is pulled along with the increase of the sound path, the inclination of the mounting holes of the correlation transducers becomes larger, the edges of the holes are thinner, and the space for arranging the transducers is almost eliminated, so that the problem of fixing and sealing is solved, and therefore, in the mode of arranging the transducers, the distance between a pair of transducers cannot be pulled to the maximum under the condition of limited pipe length. In fact, for practical applications, the transducer spacing, i.e., the turndown ratio, is very limited. In addition, the liner of the patent adopts a mode of integrally sealing a large sealing ring, which is not beneficial to installing a temperature/pressure sensor, and the integral sealing has durability problem.

For large-caliber ultrasonic water meters, the prior art cannot meet ten technical guidelines of the ultrasonic water meters, and has a plurality of defects, and although the performance of the lining oblique-insertion type transducer arranging mode is better in the three arranging modes of the oblique-insertion type transducer arranging mode, the upright-column type transducer arranging mode and the lining oblique-insertion type transducer arranging mode, the lining oblique-insertion type transducer arranging mode has fatal defects. Aiming at the lining oblique insertion type transducer arrangement mode, if the four advantages of the lining oblique insertion type transducer arrangement mode can be reserved to overcome the fatal defect that the spacing is limited when a pair of transducers are installed in the lining, and solve the problems of transducer fixing and sealing, the performance of the large-caliber multichannel ultrasonic flowmeter can be broken through to reach a new height; in addition, the problems of converting the integral seal of the lining into the partial seal and facilitating installation of the temperature/pressure sensor and the like are solved, and therefore, the invention provides a flange transducer type large-caliber multichannel ultrasonic water meter according to ten technical guidelines of the ultrasonic water meter.

Disclosure of Invention

According to ten technical guidelines of the ultrasonic water meter, the application provides a large-caliber multichannel ultrasonic water meter with a flange transducer layout, reserves four advantages of a lining oblique insertion type transducer arrangement mode, overcomes the fatal defects of the lining oblique insertion type transducer arrangement mode, and provides a novel L-shaped transducer and adaptive arrangement structure and a brand-new large-caliber multichannel ultrasonic water meter structure.

The technical scheme of the invention is as follows: (1) First, an innovation is made on the transducer structure, namely an L-shaped small-size ultrasonic transducer is provided. The L-shaped small-size ultrasonic transducer is divided into an upper part and a lower part, the column body at the upper end part of the L-shaped small-size ultrasonic transducer has the sealing and fixing functions, and the lower end part of the L-shaped small-size ultrasonic transducer emits ultrasonic waves to play a role in directional positioning; (2) Secondly, the layout position of the transducer is innovated, namely the L-shaped transducer is laid between the bottom of the flange inner ring and the lining, namely a column body with the upper end having sealing and fixing functions is arranged in the flange to play a role in positioning and sealing, and a part with the lower end sending out ultrasonic wave functions is laid in a correlation channel of the transducer in the lining, so that the positioning of the direction of the transducer is skillfully solved and sealing is not needed. The two measures skillfully solve the practical application problems that the fixing and sealing occupied space of the transducer is large, the functional part which actually emits ultrasonic waves is small in size and not easy to position and seal. Because the transducers are arranged in the flanges, and the distance between the pair of flanges is the length of the flowmeter base table, the effective distance between the pair of transducers reaches the maximum value under the specified flowmeter pipe section length condition, thereby perfectly realizing the principle of maximizing the ultrasonic flow path, namely the range ratio maximizing, and improving the technical level and the product performance of the large-caliber ultrasonic flow meter to a new height level; (3) The multi-channel transducer layout mode is adopted in the flange, so that the metering accuracy of the ultrasonic water meter is improved; (4) The fluid pipeline of the ultrasonic flowmeter is arranged into a straight-through smooth flow passage, so that the pressure loss of the fluid formed in the fluid pipeline of the flowmeter and the influence on the metering precision are avoided; (5) The ultrasonic flowmeter body adopts a manufacturing mode formed by processing and welding finished stretched pipe sections instead of a casting mode, so that standardized production can be facilitated, the consistency of the ultrasonic flowmeter is good, and the manufacturing cost can be effectively reduced.

The technical scheme is that the transducer is distributed according to the maximization of the ultrasonic transducer sound path (namely the maximization of the range ratio), the inner surface of a complete and nondestructive straight-through low-pressure loss runner, the multi-channel transducer distribution mode and the manufacturing mode (non-casting) that a pipe body is formed by welding pipe sections in a machining mode are realized; a local sealing mode; the simple layout structure of the temperature and pressure sensors is convenient to install in the flange, so that the processing and installation of the flowmeter are highly consistent, and the metering performance breakthrough of the large-caliber ultrasonic flowmeter is achieved.

The invention relates to a large-caliber multichannel ultrasonic water meter with a flange transducer layout, which is characterized in that: the device comprises a flange formed by welding two parts, a pipe body metal sleeve, an L-shaped transducer, a lining sleeve formed by embedding and butting the two parts, an inner lining pipe fixing column, an outgoing line fixing head, a transducer outgoing line pipe, a temperature sensor, a pressure sensor, an instrument circuit box and the like.

As shown in fig. 1 and 3, the flowmeter base table consists of flanges on two sides, a metal sleeve and a lining. Each side flange is formed by two symmetrical half post-welding; the thickness of the flange close to the outer ring of the flange hole is a standard flange, so that the conventional mounting of bolts is facilitated; for the placement of the transducer and the pressure/temperature sensor, the inner section of the flange is thickened. The flange inner ring is provided with a lining mounting positioning hole, a transducer mounting hole, a pressure sensor and a temperature sensor mounting hole; the center line of the mounting hole is coaxial with the radius of the flange; the positioning holes are used for combining with the convex positioning columns on the outer side of the lining to position the lining and the flange; further, a sealing surface is arranged on the outer side of the flange, and a part of the sealing surface plays a role in protecting two ends of a lining arranged in the pipe body from being exposed; the inner side of the flange is provided with an embedded notch for abutting against the metal sleeve, and when the metal sleeve is installed, after the metal sleeve is embedded into the notch, the flange and the metal sleeve can be fixedly connected by laser welding; the inner side of the flange is widened by about 6-8 mm towards the lower end, so that the diameter of an inner hole of the flange can meet the requirement of installing a temperature and pressure sensor. The metal sleeve is embedded into a corresponding notch at the inner side of the flange, and the depth of the notch is about 6-10 mm; the base surface tube body of the flowmeter is formed by adopting a laser welding method in the later period between the two symmetrical half flanges and between the flange and the metal sleeve;

As shown in fig. 2, the metal sleeve is internally provided with a lining, unlike the lining in patent publication number CN 111121895A, the lining and the metal sleeve do not need to be sealed, and the lining and the flange are inserted into corresponding holes on the inner side of the flange through convex columns on the lining to achieve positioning; after the positioning and fixing between the lining and the flange are finished, the joint between the flange and the metal sleeve (a gap is reserved between the metal sleeve and the flange and the positioning is not performed); the length of the flowmeter base table is determined by the length of the liner and the flanges after positioning, and the inner sides of the sealing surfaces of the two flanges are abutted against the two end surfaces of the liner; the inner lining can be provided with a plurality of channel holes of the opposite-type energy converter to form a plurality of channels, the diameter of the channel holes of the opposite-type energy converter is 10mm, and the integrity of the inner wall of the flow channel is not affected because the diameter of the channel holes is small; the lining is also symmetrically provided with mounting holes of the pressure sensor and the temperature sensor, and the holes correspond to the mounting holes of the pressure sensor and the temperature sensor on the flange; the cylindrical lining is formed by combining two symmetrical parts, and the butt joint surface is butt-jointed by a convex structure and a concave structure; the cylindrical lining is provided with a transducer direction positioning hole and a pressure/temperature sensor mounting position hole; the cylindrical lining is formed by injection molding of engineering plastics such as PPO, PPS, PA66 and the like and is formed by combining two halves, so that the mold and the injection molding process are convenient; in addition, the correlation positions of the corresponding transducer holes are completely determined by the die at one time, so that the correlation surface angles of a group of correlation transducers are not permanently deviated, and the long-term stability of ultrasonic signals sent by the transducers is effectively ensured.

As shown in FIG. 2, in order to more accurately measure the fluid, the invention arranges a plurality of groups of transducers on the layers of different heights in the lining pipe so as to measure and calculate the fluid flow velocity in the pipe at different layers to obtain more accurate measurement values. Fig. 2 shows a layout arrangement of the channels of transducer 4, a, b, c, d being layered on 4 different height levels.

As shown in fig. 5 and 6, the L-shaped transducer with an innovative structure consists of a sealing fixed column and a functional column, wherein the sealing fixed column and the functional column are positioned and butted, and then are welded into a whole by laser; the angle between the two parts of the transducer is formed by the transducer sealing fixed column and the transducer sound wave pair perforation on the lining

Definite, the->

The angle is the included angle between the radius of the flange and the opposite ray; an ultrasonic ceramic component, namely a ceramic chip, a PCB and a signal wire, is arranged in the functional column; two sealing rings are arranged on the sealing fixing column, and an elastic rubber ring is arranged at the top of the sealing fixing column; the sealing fixing column is arranged in a fixing hole at the bottom of the flange inner ring and is sealed with the fixing hole (in the direction coaxial with the radius of the flange); the functional column is obliquely inserted into the lining hole, so that tight fit and directional positioning are realized without sealing; the transducer signal wire is formed by the outer side of a metal sleeve The inner side of the flange is led out into the instrument fixing column and is led to the PCB of the instrument box; further, the frequency of the ceramic vibrator of the L-shaped transducer is 2MHz or 4MHz, and the dimension phi is 8mm; the sealing column of the L-shaped transducer is arranged in a mounting straight hole at the bottom of the flange inner ring, the size of the mounting straight hole with a sealing ring is phi 14mm, and the mounting straight hole only occupies the space of the flange; the diameter of the functional column of the L-shaped transducer is phi 10mm, and the functional column is arranged in the transducer mounting hole corresponding to the inner bushing pipe, so that the aperture is smaller, and the influence on the inner cavity of the flow rate is negligible.

As shown in fig. 5 and 6, the transducer is made by: 1) The sealing column and the functional column of the L-shaped transducer are respectively injection molded, and injection molding materials can be PPS or PEEK; 2) Welding a ceramic chip, a PCB package and a signal lead of the transducer assembly into the blind hole of the functional column; 3) The transducer signal wire of the functional column passes through the central hole of the sealing column, then the sealing column is in butt joint with the functional column, and the butt joint opening has a unique butt joint azimuth to form an L shape; 4) The L-shaped transducer was placed in a mechanical jig for fixation, and laser automatic welding was completed (note: laser welding has been widely used for metal and non-metal welding);

As shown in fig. 2 and 10, the pressure sensor is installed in a pressure sensor hole at the bottom of the water inlet end flange of the base meter, and is sealed by screw connection and compression copper washers. The outer end of the pressure sensor is arranged in the lining hole, the pressure sensor is not exposed, and the flowing state of the fluid to be measured at the water inlet end is not influenced.

As shown in fig. 1 and 11, the temperature sensor is installed in a temperature sensor hole at the bottom of the water outlet end flange of the base table, and is sealed by screw connection and compression copper washers. The outer end of the temperature sensor extends out of the lining hole to the center of the flow channel, and the temperature is measured. The temperature sensor is arranged at the water outlet end, so that the flowing state of the fluid to be measured is not influenced.

As shown in fig. 1 and 2, all signal lines are led out from the inner side of the flange near the outer side of the metal sleeve. As further shown in fig. 9, in the lead-out wire hole, the gasket is compressed and sealed between the outer side of the metal sleeve and the hole wall by pressing the gasket through the threaded post screwing hole of the lead-out wire fixing head of the metal lead-out tube.

As shown in fig. 1 and 2, the instrument circuit box is fixed on the instrument fixing column through screws, and an integrating circuit board, a display screen and a battery are arranged in the instrument circuit box. If IP68 protection is required, waterproof glue can be filled in the instrument circuit box.

The assembly process of the flowmeter base table comprises the following steps: 1) Combining and butt-mounting flange liners in a metal sleeve: as shown in fig. 7 and 8, two semi-cylindrical inner liners are inserted into the metal sleeve from both ends of the metal sleeve, respectively, and simultaneously inserted, the embedded convex grooves between the inner liners of the two semi-cylindrical inner liners are butted. Note that: because one side of the outer side of each semi-cylindrical lining shell is provided with a lining positioning column, and the contact side embedded convex-concave grooves of the two semi-cylindrical lining shells are provided with unique directions (one side is convex and the other side is concave), only unique selection is adopted during butt joint, and the false assembly is avoided; 2) Mounting pressure or temperature sensors on the flange halves: firstly, penetrating a signal wire, then aligning threads of a pressure sensor and a temperature sensor with corresponding mounting holes of a flange, installing a copper gasket, and tightly fixing by screwing the threads; 3) The half flange is butted with an inner hole on the half flange and an ultrasonic transducer sealing fixing column on the lining as well as a lining positioning column: two ends of the lining are provided with transducer pair perforations, one end of a transducer function column is inserted into the pair perforations to be tightly matched, as shown in figure 8, for the arrangement of four-channel transducers, two transducers are inserted into one side of a half flange, the half flange is buckled after finishing, namely, a signal wire is penetrated firstly, and then a transducer sealing fixing column is inserted into a corresponding hole at the lower side of the flange; meanwhile, if the lining positioning column is arranged, the lining positioning column is also inserted together, so that the installation is completed; if a pressure or temperature sensor is mounted on the flange, a pressure sensor hex bolt head or a temperature sensor hex bolt head is inserted into a corresponding hole in the liner. Note that two rubber rings are sleeved on the transducer sealing and fixing column in advance, and an elastic rubber cushion (the rubber cushion is slightly larger than the hole in size and cannot fall off) can be placed in the flange hole in advance; 4) Installing a pressure or temperature sensor according to the arrow direction outside the metal sleeve: when operating according to 3), because the outside of the metal sleeve is provided with a flow meter fluid flowing direction arrow, when installing a half flange, the flange with the pressure sensor is installed at the water inlet end, the flange with the temperature sensor is installed at the water outlet end; 5) Positioning the two half flanges by using a clamp, and fixing by spot welding: after the steps are finished, the two half flanges on one side are clamped by the clamp, namely the flange sections are flat and are closely butted, and then the spot welding seam is temporarily fixed by a manual laser gun. The butt joint fixing of the two half flanges on the other side is completed in the same way, and fig. 4 shows the positions of the transducer, the lining fixing column and the temperature sensor inside the flanges; 6) Positioning the flange and the instrument box: the welding lines of the flanges formed by the two half edges in the two flange directions are automatically aligned due to the limitation of the positioning column at the outer side of the lining, and then the welding lines are fixed by a clamp; adjusting the middle metal sleeve, aligning the central line of the mounting column of the instrument box with the welding joints of the flanges at the two sides (the mounting column of the instrument box is welded on the metal sleeve in advance), namely, correcting the direction of the gauge outfit (the positioning of the left flange hole and the right flange hole on the clamp is adopted), and adjusting the horizontal positioning and the vertical positioning between the flange surface and the metal sleeve through the clamp; 7) Welding the flange and the metal sleeve: the laser mechanical arm is used for automatically completing welding the 4 half flanges and the metal sleeve which are fixed by the clamp in the 6 th step, so that a complete flowmeter base table is formed, and supporting ribs can be added at the joint of the flange and the metal sleeve according to actual requirements so as to increase the strength; 8) Installing a signal wire metal tube: as shown in fig. 1 and 9, at the output hole of the signal wire at the inner side of the flange, a metal pipe fixing head screw column is used for extruding a gasket to seal a compression sealing ring between the outer side of the metal sleeve and the hole wall, fixing the outgoing wire metal pipe, leading out the signal wire of the transducer or the pressure and temperature sensor, and leading the signal wire into the fixing column of the instrument box. Similarly, a metal tube fixing head is used for fixing the sealing and fixing between the metal tube and the fixing column of the instrument box; 9) Installing an instrument circuit meter box: leading the signal outgoing line into the instrument box and welding the signal outgoing line with the PCB, fixing the instrument box on the instrument box fixing column by using a screw, and finishing assembly.

Compared with the large-caliber transducer oblique insertion type ultrasonic flowmeter in the prior art, the invention has outstanding substantive characteristics and remarkable progress, and is characterized in that:

firstly, compared with the large-caliber ultrasonic water meter with given straight-through pipe length of the flowmeter and inclined insertion type mounting structure of transducers with various calibers, the invention adopts the method of firstly arranging, setting and assembling opposite-type ultrasonic transducers on the thick wall of the inner diameter of the flange of the base meter, and arranging the opposite-type ultrasonic transducers in the two flanges to ensure that the projection distance of the opposite-type ultrasonic transducers in the water flow direction is longest, namely

The maximum value is equal to the length of the tube section of the flowmeter, so according to +.>

It can be seen that the effective sound path maximization of the large-caliber ultrasonic water meter measurement is realized, namely the range ratio maximization and the initial flow minimization are realized.

Secondly, the invention adopts a multichannel transducer layout mode in the flange, thereby remarkably improving the metering precision of the ultrasonic water meter and realizing the high-precision metering of the large-caliber ultrasonic water meter. In the invention, a plurality of groups of transducers are distributed in two flanges and are arranged on layers with different heights in an inner liner tube so as to calculate the fluid flow velocity in the tube body with different layers, thereby obtaining high-precision metering values, and FIG. 2 shows that the transducers with 4 channels are arranged and a, b, c, d are distributed on the layers with 4 different heights.

Thirdly, the invention innovatively provides the transducer with the L-shaped structure, and the problem that the common convex transducer is difficult to position and seal in the lining is successfully solved. The energy converter with the L-shaped structure consists of a sealing fixed column and a functional column, and the sealing fixed column and the functional column are welded into a whole by laser after being positioned and butted; the transducer with the L-shaped structure is characterized in that a large-size positioning and sealing part, namely a transducer sealing fixing column, is arranged in the flange, and a small-size functional column part which is not required to be sealed and is positioned is obliquely inserted into the opposite perforation of the lining, so that the purposes of reliable sealing, fixing and positioning and mounting of the transducer are achieved; the angle between the two parts of the transducer is formed by the transducer sealing fixed column and the transducer sound wave pair perforation on the lining

And (5) determining. An ultrasonic ceramic component, namely a ceramic chip, a PCB and a signal wire, is arranged in the functional column; two sealing rings are arranged on the sealing fixing column, and an elastic rubber ring is arranged at the top of the sealing fixing column. The sealing fixing column is arranged in a fixing hole at the bottom of the flange inner ring and is sealed with the fixing hole (in the direction coaxial with the radius of the flange); the functional column is obliquely inserted into the lining hole to realize tight fit and directional positioning without sealing.

Fourth, the invention innovatively provides a water meter flange with a built-in energy converter, which realizes that the energy converter sealing fixing column part, the pressure sensor, the temperature sensor and the lining positioning column structure are conveniently arranged in the water meter flange. The water meter flange provided by the invention is formed by two symmetrical half post-welding, and the thickness of the outer ring of the hole of the flange is a standard flange, so that the conventional mounting of bolts is facilitated; for the placement of the transducer and the pressure/temperature sensor, the inner section of the flange is thickened. The flange inner ring is provided with a lining mounting positioning hole, a transducer mounting hole, a pressure sensor and a temperature sensor mounting hole; the center line of the mounting hole is coaxial with the radius of the flange; the positioning holes are used for combining with the bulges at the outer side of the lining to position the lining and the flange; further, a sealing surface is arranged on the outer side of the flange, and a part of the sealing surface plays a role in protecting two ends of a lining arranged in the pipe body from being exposed; the flange is provided with an embedded notch for abutting against the metal sleeve, and when the flange is installed, after the metal sleeve is embedded into the notch, the flange and the metal sleeve can be connected and fixed by laser welding.

Fifthly, the invention provides a novel lining structure, wherein the lining is positioned in the metal sleeve, sealing is not needed between the lining and the metal sleeve, and the lining and the flange are inserted into corresponding holes on the inner side of the flange through convex columns on the lining to achieve positioning; after the positioning and fixing between the lining and the flange are finished, the joint between the flange and the metal sleeve (a gap is reserved between the metal sleeve and the flange and the positioning is not performed); the length of the flowmeter base table is determined by the length of the lining and the thickness of the flange after positioning, namely the end surfaces of the two linings are abutted against the inner end surface of the sealing surface of the flange; the inner lining is provided with a plurality of channel holes of the opposite-type transducer; the lining is also symmetrically provided with a pressure sensor and a temperature sensor hole, and the hole corresponds to the mounting hole of the pressure sensor and the temperature sensor on the flange; the cylindrical lining is formed by combining two symmetrical parts, and the butt joint surface is butt-jointed by a convex structure and a concave structure; the cylindrical lining is provided with a transducer direction positioning hole and a pressure/temperature sensor extending hole, and the two half-sides of the cylindrical lining form the mold and the injection molding are convenient to process; the correlation positions of the corresponding transducer holes are completely determined by the die at one time, so that the correlation surface angles of a group of correlation transducers are permanently prevented from deviating, and the long-term stability of ultrasonic signals of the transducers is effectively ensured.

Sixth, the present invention proposes a method of mounting a transducer and pressure and temperature sensors on the inner diameter and thick wall using a flange and its width, which can avoid the problem of difficulty in mounting the pressure and temperature sensors due to the need of integral sealing as described in patent publication CN 111121895A, and skillfully performing only partial sealing, so that the lead wires of the transducer and pressure and temperature sensors are led out from the outside of the metal sleeve and the inside of the flange through lead wire fixing heads. The method comprises the following steps: the invention skillfully installs and installs the pressure sensor (without outcrop) on the inner diameter thick wall of the front flange through the lining, installs the temperature sensor (with outcrop but without affecting the measurement) on the inner diameter thick wall of the rear flange, and can conveniently measure the pressure and the temperature of the fluid.

Seventh, all signal wires are led out from the inner side of the flange close to the outer side of the metal sleeve, as shown in fig. 1 and 2; as also shown in fig. 9, in the lead-out wire hole, the gasket is compressed between the outer side of the metal sleeve and the hole wall for sealing by passing through the lead-out wire fixing head threaded column of the metal lead-out tube.

Eighth, the base meter of the flowmeter does not need to be cast, but adopts a finished pipe section in a stretching mode to be welded and molded, the pipe wall is thin compared with the casting process, the cost is saved, and the processing and the manufacturing are convenient.

And ninth, the transducer is mounted between the flange and the lining by adopting a mode of directly inserting the transducer into the lining hole in an inclined way after packaging, so that the concave-convex damage to the wall of the lining is hardly caused, turbulence, vortex and the like can not be generated to the flow (especially small flow) of the fluid, and the stability of the flow of the fluid to be measured is ensured.

Tenth, the invention is that the flow channel of the flowmeter tube body is a straight pipeline, and the pressure loss is low.

Eleventh, all plastic devices in the pipe body are injection molded by using the mold, so that the consistency and interchangeability are high, the fluid characteristics in the flow channel of the flow meter pipe body are very close, and the later detection and calibration of the mass production flow meter are convenient.

In summary, compared with the existing large-caliber ultrasonic water meter, the invention not only provides an L-shaped transducer, but also provides a correlation L-shaped transducer and a new lining structure which are distributed on the inner diameter and the thick wall of the flange, and the ultrasonic water meter with a complete structure is formed by adopting a multichannel ultrasonic transducer distribution structure in the flange, so that the ultrasonic water meter with a simple structure, low cost, high performance, safety and reliability are realized, and the measurement with maximized range ratio, minimized starting flow and high precision of the ultrasonic water meter under the given pipe diameter of a given length is realized.

Drawings

FIG. 1 is a schematic diagram of the appearance of a large-caliber multichannel ultrasonic water meter with a flange transducer layout;

FIG. 2 is a cross-sectional view of a large-caliber multi-channel ultrasonic water meter with a flange transducer layout;

FIG. 3 is a schematic diagram of a flange of a large-caliber multi-channel ultrasonic water meter with a flange transducer layout;

FIG. 4 is a cross-sectional view of a flange-mounted transducer, temperature sensor, and liner positioning post;

FIG. 5 is a schematic diagram of the components of an L-shaped transducer;

FIG. 6 is a cross-sectional view of an L-shaped transducer;

FIG. 7 is a schematic diagram of liner installation;

FIG. 8 is a schematic view of flange, metal sleeve, liner, and sensor installation;

FIG. 9 is a schematic view of a lead wire fixture and an accessory;

FIG. 10 is a schematic diagram of a pressure sensor;

FIG. 11 is a schematic diagram of a temperature sensor;

in the figure:

11. a water inlet pipe body flange; 12. a water outlet pipe body flange; 11a, a half flange with a lining fixed column hole; 11b, half flange with pressure/temperature sensor hole; 21, a tube sleeve; 211. the welding position between the metal sleeve and the flange; 13. a flange sealing surface; 14. a flange notch for mounting and fixing the metal sleeve; 15. a pressure/temperature sensor mounting hole; 17. sealing and fixing the column hole by the transducer; 16. lining the fixed column holes; 18. a thickened part at the lower end of the inner side of the flange; 32. a transducer; a transducer functional portion; 32b, sealing and fixing the column by the transducer; 321. a seal ring; 322. an elastic rubber ring; 313. a signal line; 323. a laser welding line; 32a1, a ceramic sheet; 32a2.Pcb;61. a lining; 61a, 61b. Half liner; 64. the transducer pairs perforation; 62. a pressure sensor; 63. a temperature sensor; 65. the two half side linings are inlaid with convex grooves; 66. lining a positioning column; 67. the pressure/temperature sensor extends out of the hole; 42. a lead-out wire fixing head; 421. a gasket; 422. a seal ring; 41. a lead-out wire metal tube; 51. an instrument circuit box; 512. integrating a circuit PCB;511. a display screen; 513. a battery; 52. and fixing the column of the instrument box circuit.

Detailed Description

The invention will now be described in further detail with reference to the drawings and examples.

Examples:

the embodiment is a DN150 caliber multichannel ultrasonic water meter with a flange transducer layout.

As shown in fig. 1, the present embodiment includes flanges 11 and 12 formed by welding two parts 11a, 11b, a pipe body metal sleeve 21, an L-shaped transducer 32, an inner liner tube 61 formed by inlay butt joint of two parts 61a, 61b, an inner liner tube fixing post 66, an outlet wire fixing head 42, a transducer outlet wire tube 41, a temperature sensor 63, a pressure sensor 62, an instrument circuit box 51, and the like.

As shown in fig. 2 and 3, the flowmeter base table is composed of two side flanges 11 and 12, a metal sleeve 21 and an inner liner 61. Each side flange is formed by post-welding symmetrical two halves 11a and 11 b; the thicknesses of the outer rings of the flange leaning holes of the half flanges 11a and 12b are standard flanges, so that the conventional mounting bolts are convenient; for the placement of the transducer and the pressure/temperature sensor, the flange inner section 18 is thickened. The inner ring of the flange is provided with a lining mounting positioning hole 16, a transducer mounting hole 17 and a pressure sensor or temperature sensor mounting hole 15; the center line of the mounting hole is coaxial with the radius of the flange; the positioning holes 16 are used for combining with the protruding positioning posts 66 on the outer side of the lining to position the lining and the flange; further, a sealing surface 13 is arranged on the outer side of the flange, and a part of the sealing surface plays a role in protecting the two ends of the lining arranged in the pipe body from being exposed; the inner side of the flange is provided with an embedded notch 14 for abutting the metal sleeve, and when the metal sleeve is embedded into the notch, the flange and the metal sleeve can be fixedly connected by laser welding; the inner side of the flange is widened by about 6-8 mm towards the lower end, so that the diameter of an inner hole of the flange can meet the requirement of installing a temperature and pressure sensor. The metal sleeve 21 is embedded into the corresponding notch 14 at the inner side of the flange, and the depth of the notch is about 6-10 mm; the base surface tube body of the flowmeter is formed by adopting a laser welding method in the later period between the two symmetrical half flanges and between the flange and the metal sleeve;

As shown in fig. 2, the metal sleeve 21 is provided with a liner 61, unlike the liner described in patent publication CN 111121895A, the liner and the metal sleeve of the present invention do not need to be sealed, and the liner and the flange are inserted into the corresponding hole 16 inside the flange to achieve positioning through the boss 66 on the liner; after the positioning and fixing between the lining and the flange are finished, the joint between the flange and the metal sleeve (a gap is reserved between the metal sleeve and the flange and the positioning is not performed); the length of the flowmeter base table is determined by the length of the liner and the flanges after positioning, and the inner sides of the sealing surfaces 13 of the two flanges are abutted against the two end surfaces of the liner; the inner lining is provided with a plurality of pairs of channel holes 64 of the correlation transducer, the diameter of the channel holes is 10mm, and the channel holes are small and do not affect the integrity of the inner wall of the flow channel; the lining is symmetrically provided with a pressure sensor and a temperature sensor outlet hole 67 which corresponds to the mounting holes 15 of the pressure sensor 62 and the temperature sensor 63 on the flange; the cylindrical lining 61 is formed by combining two symmetrical parts 61a and 61b, and the butt joint surface is provided with a convex structure 65 which is inlaid and butt-jointed; the cylindrical lining is provided with a transducer direction positioning 64 hole and a pressure/temperature sensor hole 67; the cylindrical lining is formed by injection molding of engineering plastics such as PPO, PPS, PA66 and the like and is formed by combining two halves, so that the mold and the injection molding process are convenient; in addition, the correlation positions of the corresponding transducer holes are completely determined by the die at one time, so that the correlation surface angles of a group of correlation transducers can not deviate forever, and the long-term stability of the rate signals is effectively ensured.

As shown in FIG. 2, in order to more accurately meter the fluid, the present invention places groups of transducer arrangements at different levels within the liner 61 pipe to calculate the fluid flow rate within the pipe at different levels to obtain more accurate metering values. Fig. 2 shows an arrangement of 4 channels, a, b, c, d, distributed over 4 different height levels.

As shown in fig. 5 and 6, an L-shaped transducer 32 with an innovative structure is composed of a sealing fixed column 32b and a functional column 32a, which are positioned and butted, and then welded into a whole at a joint 323 by laser; the angle between the two parts of the transducer is formed by the transducer sealing fixed column and the transducer sound wave pair perforation on the lining

Determined (i.e., the angle between the flange radius and the correlation line). The functional column is internally provided with an ultrasonic ceramic component, namely a ceramic chip 32a1, a PCB 32a2 and a signal wire 313; the sealing fixing column is provided with two sealing rings 321, and the top of the sealing fixing column is provided with an elastic rubber ring 322. The sealing fixing column 32b is arranged in the fixing hole 17 at the bottom of the flange inner ring and is sealed with the fixing hole (the direction coaxial with the radius of the flange); the functional post 32a is inserted into the liner hole 64 in an oblique manner to provide a tight fit and orientation without sealing. The transducer signal wire 313 is led out from the outer side of the metal sleeve and the inner side of the flange into the instrument fixing column and is led to the PCB 512 of the instrument box 51; further, the frequency of the ceramic vibrator of the L-shaped transducer is 2MHz or 4MHz, and the dimension phi is 8mm; the sealing column of the L-shaped transducer is arranged in the mounting straight hole 17 at the bottom of the flange inner ring, the diameter of the sealing ring is phi 14mm, and the sealing ring only occupies the space of the flange; while the functional column diameter of the L-shaped transducer is phi 10mm and is arranged corresponding to the inner bushing pipe The transducer mounting hole 64 is smaller and has a negligible effect on the flowmeter bore.

As shown in fig. 5 and 6, the transducer is manufactured by:

1) The sealing column and the functional column of the L-shaped transducer are respectively injection molded, and injection molding materials can be PPS or PEEK;

2) Welding a ceramic chip, a PCB package and a signal lead of the transducer assembly into the blind hole of the functional column;

3) The transducer signal wire of the functional column passes through the central hole of the sealing column, then the sealing column is in butt joint with the functional column, and the butt joint opening has a unique butt joint azimuth to form an L shape;

4) The L-shaped transducer is placed in a mechanical fixture to be fixed, and is finished with a laser automatic welding joint 323 (note: laser welding has been widely used for metal and non-metal welding);

as shown in fig. 2 and 10, the pressure sensor 62 is installed in the pressure sensor hole 15 at the bottom of the water inlet end flange of the base meter, and is sealed by screwing and pressing a copper gasket. The outer end of the pressure sensor is arranged in the lining hole 67, the pressure sensor is not exposed, and the flowing state of the measured fluid at the water inlet end cannot be influenced.

As shown in fig. 1 and 11, the temperature sensor 63 is installed in the temperature sensor hole 15 at the bottom of the water outlet end flange of the base table, and is sealed by screwing and pressing a copper gasket. The outer end of the temperature sensor extends out of the lining hole 67 to the center of the flow channel to measure the temperature. The temperature sensor is arranged at the water outlet end, so that the flowing state of the fluid to be measured is not influenced.

As shown in fig. 1 and 2, all signal lines are led out from the inner side of the flange near the outer side of the metal sleeve. As further shown in fig. 9, in the lead wire hole, the gasket 421 is pressed by screwing the screw of the lead wire fixing head 42 of the metal lead wire tube 41 into the hole to compress the sealing ring 422 between the outside of the metal sleeve and the hole wall.

As shown in fig. 1 and 2, the meter circuit box 51 is fixed to the meter fixing column 52 by a screw 521, and the meter circuit box 51 has an integrating circuit board 512, a display 511 and a battery 513. If IP68 protection is required, waterproof glue can be filled in the instrument circuit box.

The assembly process of the flowmeter base table comprises the following steps:

1) The flange liners 61a and 61b are combined and butt-mounted within the metal sleeve 21: as shown in fig. 7 and 8, two semi-cylindrical liner cases are inserted into the metal sleeve from both ends of the metal sleeve, respectively, and simultaneously inserted, the insert convex-concave grooves 65 between the two semi-cylindrical liner cases are abutted. Note that: since the lining positioning column 66 is arranged on one side of the outer side of each semi-cylindrical lining shell, and the embedded convex-concave grooves of the contact edges of the two semi-cylindrical lining shells have a unique direction (one side is convex and the other side is concave), only a unique choice is adopted during butt joint, and the false assembly is avoided; the method comprises the steps of carrying out a first treatment on the surface of the

2) The pressure sensor 62 or the temperature sensor 63 is mounted on the flange half: the pressure sensor and the temperature sensor are threaded through the signal wire, the mounting holes 15 corresponding to the flange are aligned, copper gaskets are arranged, and the pressure sensor and the temperature sensor can be sealed and fixed by screwing the threads. The method comprises the steps of carrying out a first treatment on the surface of the

3) The half flange is abutted with the inner hole on the half flange and the ultrasonic sensor sealing and fixing column 32b on the lining and the lining positioning column 66: two ends of the lining are provided with transducer pair perforations 64, one end 32a of a transducer function column is inserted into the pair perforations to be tightly matched, as shown in fig. 8, if the transducer function column is four channels, two transducers are inserted into one side of a half flange, the half flange is buckled after completion, namely, a signal wire is penetrated firstly, and then a transducer sealing fixing column 32b is inserted into a corresponding hole at the lower side of the flange; meanwhile, if the lining positioning column 66 is arranged, the lining positioning column is also inserted together, so that the installation is completed; if a pressure or temperature sensor is mounted on the flange, a pressure sensor hex bolt head or a temperature sensor hex bolt head is inserted into a corresponding hole 67 in the liner. Note that two rubber rings are sleeved on the transducer sealing and fixing column in advance, and an elastic rubber cushion (the rubber cushion is slightly larger than the hole in size and cannot fall off) can be placed in the flange hole in advance;

4) Installing a pressure or temperature sensor according to the arrow direction outside the metal sleeve: when operating according to 3), because the outside of the metal sleeve is provided with a flow meter fluid flowing direction arrow, when installing a half flange, the flange with the pressure sensor is installed at the water inlet end, the flange with the temperature sensor is installed at the water outlet end;

5) Positioning the two half flanges, and fixing by spot welding: after the steps are finished, the two half flanges on one side are clamped by the clamp, namely the planes of the flange sections are tightly butted, and then the spot welding seam is temporarily fixed by a manual laser gun. The butt joint fixing of the two half flanges on the other side is completed in the same way, and fig. 4 shows the positions of the transducer, the lining fixing column and the temperature sensor inside the flanges;

6) Positioning the flange and the instrument box: the weld joints of the flanges formed by the two flange directions, including the two halves, are automatically aligned due to the restriction of the positioning posts 66 on the outside of the liner, and thereafter secured with a clamp; adjusting the middle metal sleeve 21, aligning the central line of the mounting column 52 of the instrument box with the welding joints of the flanges at the two sides (the mounting column of the instrument box is welded on the metal sleeve in advance), namely, correcting the direction of the gauge outfit (the positioning of the left flange hole connecting column and the right flange hole connecting column on the clamp is adopted), and adjusting the horizontal positioning and the vertical positioning between the flange surface and the metal sleeve through the clamp;

7) Welding the flange and the metal sleeve: and 6) welding the 4 half flanges and the metal sleeve which are fixed by the clamp by using a laser manipulator, so as to form a complete flowmeter base table, and according to actual requirements, supporting ribs can be added at the joint of the flange and the metal sleeve to increase the strength.

8) Installing a signal wire metal tube: as shown in fig. 1 and 9, at the output hole of the signal wire at the inner side of the flange, a metal pipe fixing head 42 is used for extruding a gasket 421 by a screw column, compressing a sealing ring 422 between the outer side of the metal sleeve and the hole wall to seal and fix the outgoing wire metal pipe 41, leading out the signal wire of the transducer or the pressure and temperature sensor, and leading into a fixing column 52 of the instrument box. Similarly, a metal tube fixing head is used for fixing the sealing and fixing between the metal tube and the fixing column of the instrument box;

9) Installing an instrument circuit meter box: leading the signal outgoing lines into a circuit instrument box 51 and welding the circuit instrument box with a PCB 512 board, and fixing the instrument box on an instrument box fixing column by using a screw 521 to finish assembly;

while the invention has been described by way of examples in connection with the above embodiments, the invention is not limited to the specific embodiments described, but any modifications or variations based on the teachings of the invention are intended to fall within the scope of the invention as claimed.

Claims (7)

1. The large-caliber multichannel ultrasonic water meter with the flange transducer layout is characterized by comprising flanges (11) and (12) formed by welding two parts (11 a) and (11 b), a tube metal sleeve (21), an L-shaped transducer (32), an inner lining sleeve (61) formed by embedding and butting two parts (61 a) and (61 b), an inner lining tube fixing column (66), an outgoing line fixing head (42), a transducer outgoing line tube (41), a temperature sensor (63), a pressure sensor (62), an instrument circuit box (51) and the like; the flowmeter base table consists of two side flanges (11) and (12), a metal sleeve (21) and a lining (61); each side flange is formed by post-welding symmetrical halves (11 a), (11 b).

2. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: the thickness of the outer ring of the flange hole close to the flange (11) and the flange (12) is a standard flange, so that the conventional installation of bolts is facilitated; for the placement of the transducer and the pressure/temperature sensor, the flange inner section (18) is thickened; the inner ring of the flange is provided with a lining mounting positioning hole (16), a transducer mounting hole (17), a pressure sensor and a temperature sensor mounting hole (15); the center line of the mounting hole is coaxial with the radius of the flange; the positioning holes (16) are used for combining with the protruding positioning columns (66) on the outer side of the lining to position the lining and the flange; further, a sealing surface (13) is arranged on the outer side of the flange, and a part of the sealing surface plays a role in protecting two ends of a lining arranged in the pipe body from being exposed; an embedded notch (14) for abutting against the metal sleeve is formed in the inner side of the flange, and when the metal sleeve is embedded into the notch, the flange and the metal sleeve can be fixedly connected by laser welding; the inner side of the flange is widened by about 6-8 mm near the lower end, so that the diameter of an inner hole of the flange can meet the requirement of mounting temperature and pressure sensors; the metal sleeve (21) is embedded into a corresponding notch (14) at the inner side of the flange, and the depth of the notch is about 6-10 mm; and a laser welding method is adopted in the later stage between the two symmetrical half flanges and between the flange and the metal sleeve, so that a base surface tube body of the flowmeter is formed.

3. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: a lining (61) is arranged in the metal sleeve (21), sealing is not needed between the lining and the metal sleeve, and the lining and the flange are inserted into corresponding holes (16) at the inner side of the flange through convex columns (66) on the lining to achieve positioning; after the positioning and fixing between the lining and the flange are finished, the joint between the flange and the metal sleeve (a gap is reserved between the metal sleeve and the flange and the positioning is not performed); the length of the flowmeter base table is determined by the length of the liner and the thickness of the flange after positioning, and the inner sides of the two flange sealing surfaces (13) are tightly abutted against the two end surfaces of the liner; the inner lining is provided with a plurality of channel holes (64) of the opposite-type transducer; the lining is also symmetrically provided with pressure sensors or temperature sensor extending holes (67) which correspond to the mounting holes (15) of the pressure sensors (62) and the temperature sensors (63) on the flange; the cylindrical lining (61) is formed by combining two symmetrical parts (61 a) and (61 b), and a convex structure (65) is inlaid and butted on the butted surface; the cylindrical lining is provided with a transducer direction positioning hole (64) and a pressure/temperature sensor extending hole (67), and the two half-sides of the cylindrical lining form the mold and the injection molding are convenient to process; the correlation positions of the corresponding transducer holes are completely determined by the die at one time, so that the correlation surface angles of a group of correlation transducers are permanently prevented from deviating, and the long-term stability of ultrasonic signals of the transducers is effectively ensured.

4. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: the layout structure of the multichannel ultrasonic transducers adopted in the flange is that a plurality of groups of transducers are arranged and arranged on layers with different heights in a lining (61) pipe so as to calculate the fluid flow velocity in the pipe at different layers, and the four-channel ultrasonic transducer layout structure is a, b, c, d and distributed on 4 layers with different heights.

5. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: the L-shaped transducer (32) consists of a sealing fixed column (32 b) and a functional column (32 a), and the sealing fixed column and the functional column are welded into a whole at a connecting part (323) by laser after being positioned and butted; the angle between the two parts of the transducer is formed by the transducer sealing fixed column and the transducer sound wave pair perforation on the lining

Determining; the functional column is internally provided with an ultrasonic ceramic component, namely a ceramic chip (32 a 1), a PCB (32 a 2) and a signal wire (313); the sealing fixing column is provided with two sealing rings (321), and the top of the sealing fixing column is provided with an elastic rubber ring (322); the sealing fixing column (32 b) is arranged in the bottom fixing hole (17) of the flange inner ring and is sealed with the flange hole (in the direction coaxial with the radius of the flange); the direction of the functional column (32 a) obliquely inserted into the lining hole (64) is tightly matched and positioned without sealing; the transducer signal wire (313) is led out from the outer side of the metal sleeve and the inner side of the flange into the instrument fixing column and is led to the PCB (512) of the instrument box (51); further, the frequency of the ceramic vibrator of the L-shaped transducer is 2MHz or 4MHz, and the dimension phi is 8mm; the sealing column of the L-shaped transducer is arranged in a mounting straight hole (17) at the bottom of the flange inner ring, the diameter of the sealing ring is phi 14mm, and the sealing ring only occupies the space of the flange; and the functional column diameter of the L-shaped transducer is phi 10mm and is arranged in the transducer mounting hole (64) corresponding to the inner bushing pipe.

6. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: the pressure sensor (62) is arranged in a pressure sensor hole (15) at the bottom of the flange at the water inlet end of the base meter and is sealed by a compression copper gasket through threaded connection; the outer end head of the pressure sensor is arranged in the lining hole (67), the pressure sensor is not exposed, and the flowing state of the fluid to be measured at the water inlet end is not influenced; the temperature sensor (63) is arranged in a temperature sensor hole (15) at the bottom of the flange at the water outlet end of the base table, and is sealed by a compression copper gasket through threaded connection; the outer end head of the temperature sensor extends out from the inner lining hole (67) to the center of the flow channel, and the temperature of the fluid passing through the ultrasonic water meter is measured; the temperature sensor is arranged at the water outlet end, so that the flowing state of the fluid to be measured is not influenced.

7. The large caliber multichannel ultrasonic water meter of claim 1 wherein the flange transducer arrangement is characterized by: all signal wires are led out from the inner side of the flange close to the outer side of the metal sleeve; in the lead-out wire hole, a gasket (421) is pressed by screwing into the threaded column of the lead-out wire fixing head (42) passing through the metal lead-out tube (41) to compress a sealing ring (422) to seal between the outer side of the metal sleeve and the hole wall.

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