CN215726162U

CN215726162U - Large-caliber multi-channel partition correlation type ultrasonic flowmeter

Info

Publication number: CN215726162U
Application number: CN202121881964.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Juelong Sensing Technology Shenzhen Co ltd
Current assignee: Juelong Sensing Technology Shenzhen Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-02-01
Anticipated expiration: 2031-08-16

Abstract

The utility model belongs to the technical field of flow metering equipment, and particularly relates to a large-caliber multi-channel partition correlation type ultrasonic flow meter, aiming at solving the problems that the metering range ratio is low, the metering precision is not high, and the difference exists between the prior art and the optimized solution of the technical development of a large-caliber ultrasonic water meter. The utility model adopts the following steps: the utility model has the advantages of maximized measuring range ratio, minimized initial flow value and maximized sound wave energy transfer amplitude between ultrasonic transducers, has the characteristic of fluid turbulence interference resistance, and meets the requirement of high measuring precision in a measuring range under the condition of various practical application occasions.

Description

Large-caliber multi-channel partition correlation type ultrasonic flowmeter

Technical Field

The utility model belongs to the technical field of flow metering equipment, and particularly relates to a large-caliber multi-channel partition correlation type ultrasonic flowmeter.

Background

According to the actual application, the fluid metering industry or occasions expect standard flow metering devices which are compatible with various caliber specification ranges, low pressure loss, high precision, high reliability, no abrasion devices, durability and economy. At present, the most widely used worldwide for all-electronic flow measurement are electromagnetic flow meters and ultrasonic flow meters which are from the beginning to the end.

The ultrasonic flowmeter is developed along with the technical breakthrough of a time difference timing chip (in 2012-2017, advanced time difference timing chips are successively proposed by companies such as AMS, D-FLOW, TI and the like internationally, and the resolution of the ultrasonic flowmeter reaches 5-10 ps at present, so that the ultrasonic flowmeter completely meets the application requirement of water metering). In contrast to electromagnetic flow meters, ultrasonic flow meters are sampled by time difference digital signals (whereas electromagnetic flow meters are sampled by analog signals). Taking a water meter as an example, the water meter has the outstanding technical advantages that: the method has the advantages of smaller initial flow (such as liquid with flow velocity of 0.8-1 mm/s can be measured), wider range ratio, higher precision and safety in large-caliber multi-channel measurement (the electromagnetic flowmeter only has one pair of coils and corresponding electrodes, and the coils are scrapped when the electromagnetic flowmeter fails), capability of measuring various low-viscosity liquids (the electromagnetic flowmeter cannot measure low-conductivity liquid, such as purified water), and capability of measuring/metering gases such as gas (the electromagnetic flowmeter cannot measure gas flow).

In general, the performance index of the flow meter is the metering precision and the range ratio, the metering precision is the ratio of the flow meter quantity value and the actual flow rate value of the flow meter, and the improvement of the flow stability and the mass production consistency of the fluid is an important condition 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 accurately metered is reflected, and the necessary condition for improving the range ratio is to increase the effective distance between the ultrasonic transducers. Obviously, the higher the metering accuracy and the larger the span ratio, the better the metering performance of the flowmeter.

In recent years, the metering industry has greatly advanced the practical application of ultrasonic flow meters. The ultrasonic flowmeter is composed of a transducer, a transducer mounting mode, a flow channel structure and the like, besides a time difference integrating circuit, wherein the performance of the transducer determines the minimum value of measurable flow, and the overall structure of the ultrasonic flowmeter determines the comprehensive performance and quality of the ultrasonic flowmeter. Taking a water meter as an example, particularly according to the constraint of a new standard of the water meter, the technical development direction is clear in the industry, and the optimized solution thereof follows the following principle:

(1) the principle of sound path maximization: in order to make the ultrasonic water meter have a large range ratio, for a large-caliber flow meter, particularly a water meter, a mode of maximizing the sound path between ultrasonic transducers is adopted. The large range ratio is an extremely important index for trade settlement and is the most important technical index of the water meter, which is quite different from the industrial flow meter. For example, in a manufacturing plant, the amount of water used during the day is 500 times the amount of water used at night if the flow meter has a low turndown ratio (e.g., turndown ratio)

= 200), the metering of the section with small flow water consumption at night is necessarily omitted when the metering of the section with large flow at day time is considered. In other words, the flow meter may not be able to measure at a small flow rate or the measurement error is large (the accuracy value is negative, such as the current rotary wing mechanical water meter), which inevitably causes the measurement loss of the water supply side. In order to make the ultrasonic water meter have a large range ratio and achieve fair trade settlement, the projection distance of the distance connecting line between the two transducers of the ultrasonic water meter in the water flow direction in the main pipe is maximized to obtain a large range ratio and a small initial flow (for the water meter, the Chinese national standard in 2018 promotes the maximum value of the range ratio or the flow ratio to be larger

=1000）。

(2) The principle of the correlation type installation between the transducers is as follows: the acoustic signals are directly transmitted and received by a pair of transducers, so that the effective signal amplitude is strongest. The large-caliber flowmeter has a large size, and the transducer should select a correlation installation mode in order to guarantee the signal receiving intensity. Under the condition of a sound wave reflection type installation mode of the transducer, due to the existence of one or a plurality of reflection surfaces, energy loss is transmitted in sound wave reflection (when the reflection surfaces are large enough, the sound energy loss of the reflection surfaces in an ideal state is 10-20%, and the measurement is generally not influenced), and especially when the reflection surfaces have angle deviation or are scaled after being used, the energy loss can reach 40-60%, so that the normal measurement is seriously influenced. Therefore, in recent years, the large-aperture flowmeter basically eliminates the acoustic wave reflection receiving and transmitting mode between the transducers.

(3) Multichannel principle: in order to make the large-caliber ultrasonic water meter have high metering precision and reliability, the large-caliber ultrasonic water meter should adopt a multi-channel mode (namely, a plurality of groups of transducers). This is because, in addition to the fact that the dual-channel transducer mode can perform separate calculation on the fluid at different levels in the pipeline, thereby improving the measurement accuracy and precision, the dual-channel transducer mode also provides an important guarantee for the measurement reliability (if the exciting coil of the electromagnetic flowmeter is disconnected, the flowmeter will be scrapped, while the multi-channel ultrasonic flowmeter can perform flow measurement as long as one pair of transducers is left to work even if one or more pairs of transducers are damaged).

(4) Inner tube wall integrity principle: to improve the metering accuracy and reduce the fluid resistance of an ultrasonic flow meter, the integrity of the pipe wall in the flow meter should be maintained. The surface of the flow passage of the flow meter has a concave-convex structure due to the installation of the transducer, and fluid turbulence can be generated, so that the metering precision and the range ratio of small flow and the consistency of the flow meter are greatly influenced.

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

(6) Low pressure loss principle: the flow meter channel is not reduced as much as possible, and the pressure loss is reduced. In order to overcome the disadvantage of short sound path, namely low measuring range ratio, many oblique-insertion flowmeters need to reduce the diameter, and some even make the flow passage of the flowmeter into a flat cavity, such as patent grant publication No. CN 202083425U, so as to improve the relative flow speed (because the minimum effective time difference calculated by the time difference chip is a fixed value, when the minimum value cannot be reached, the flow speed can be improved to improve the time difference for effective calculation), and the consequence of doing so can increase the pressure loss of the flowmeter and bring about the common flow in addition to the pressure loss of the flowmeter

Or overload flow

In the process, the local flow velocity of the fluid is too fast due to excessive diameter reduction, so that a water whitening phenomenon (namely, a small part of water is vaporized by a flow channel) is generated, and as a result, the metering of the flow meter is stopped (the sound velocity of the water containing the water is greatly reduced, and the time difference value is disturbed), which is why the ultrasonic water with a large caliber cannot be metered under the condition of large flow.

(7) Anti-turbulence interference principle: as is known, for the installation of a flowmeter, the accepted standard is to ensure the front ten and the back five, namely the front straight pipe section is ten times of the length of the flowmeter, and the back five times of the length of the flowmeter, so that the effective range ratio and the metering accuracy of the flowmeter can be ensured. This requirement is necessary especially for larger bore meters. However, in some special occasions, especially when the installation is carried out in a place with a small space in a pipe shaft, if the front end and the rear end are provided with the bent pipes, the front end and the rear end cannot be ensured to be five, then, as the fluid flows into the flowmeter from the bent pipes, the flow velocity distribution of the fluid is seriously deviated to one side, and for the ultrasonic flowmeter with insufficient sound channels, the measuring range ratio and the measuring precision of the flowmeter are greatly reduced, which is a difficult problem to be solved in the industry. If the requirement that straight pipe sections are not required to be arranged in front of and behind the flowmeter can be solved, powerful guarantee can be provided for the application of the flowmeter in various complex occasions.

(8) A consistency principle; the large-diameter flowmeter tube and the transducer are installed, namely, the flow channel processing and transducer assembly installation process needs to 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 determines the grade level of the flowmeter and whether time and labor are saved or not during calibration.

(9) Tube body sealing safety principle: the large-caliber flowmeter adopts the sealing ring with the same diameter and large size as the pipe diameter when the sealing of the pipe body is realized, the mounting difficulty is high, and the hidden danger exists in the sealing effect. Therefore, the sealing ring with smaller size is adopted as much as possible to ensure the sealing reliability and durability.

(10) The principle of adaptability: the pressure sensor and the temperature sensor are convenient to install (the device is suitable for different applications such as heat supply metering and gas metering).

(11) Simple structure, convenient assembly principle: the structure is simplified, the only certainty is installed, thereby the whole assembly is easy, and the flowmeter can be ensured to be stable and reliable, and the consistency is higher.

The prior art still has shortcomings or shortcomings in terms of the criteria of the above principles.

The oblique insertion type transducer is arranged, the sound path is short, the sound channel is few, and the requirement on the machining precision of the inclined hole is high: if the patent grant publication No. CN 201993129U is an oblique insertion type, the projection distance of the connecting line of the two transducers in the water flow direction in the pipe section is very short, which is not in accordance with the principle (1); in addition, when the caliber is smaller, the outer end of the pipe has no space for arranging more sound channels, which is not in accordance with the principle (3); the flow channel is internally provided with a transducer protruding part which is not in accordance with the principle (4), the requirement on the angle of an inclined hole for mounting the transducer is very high, the inclined hole deviates a small angle, the sound wave receiving intensity is greatly reduced, and therefore the processing is difficult.

The column transducer is installed, the sound path is greatly improved, the number of sound channels is more than that of the inclined insertion type transducer, and the installation is convenient, such as an authorized bulletin number CN 208921195U. However, the installation structure of the columnar transducer arranges the columns at two sides of the pipeline, and because the correlation mode of the connecting line between the transducers also forms an angle with the water flow direction, a part of the inner pipe body is cut off, so that the damage of the inner flow passage is caused (as shown in the patent figure 3), the damage generates turbulent flow when the flow speed is low, and as a result, the accuracy of small flow is low, the range ratio is influenced, and the structure is not in accordance with the principle (4). In addition, the mode can only be cast and molded, has low efficiency, poor consistency and higher cost, and is not in accordance with the principle (5).

The formula of inserting to one side of inside lining is a more new model, and application publication No. CN 111121895A compares two kinds of modes no matter be sound channel quantity, sound path, runner integrality and casing manufacturing convenience (can need not cast, directly can with finished product pipe welding shaping) all promote to some extent. However, this mode also has drawbacks: because the transducers are arranged on the lining and arranged in a ring shape at two sides, if the transducers are directly packaged on the lining, the hole sites of the transducers are distributed in a ring shape due to a large oblique angle, so that the packaging difficulty is high, and if individual packaging fails, the whole tube is scrapped; if the independent transducers are separately installed, the sealing and fixing are difficult due to the limited thickness of the lining, the large inclination of the holes and the narrow space. And because the thickness of the transducer mounting lining is limited, the inclination of the opposite-emitting transducer mounting hole is larger, the edge of the hole is thinner and the mounting space is more limited along with the separation of the transducers, the separation of the pair of transducers cannot be separated to the maximum under the condition of limited pipe length, and the relative sound path cannot be maximized. In this mode, as shown in the patent, the liner and the inner side of the metal pipe are sealed by a large seal ring having the same inner diameter as the pipe, and the durability and safety cannot be ensured, which is not in accordance with the principle (9). This solution is to seal the entire liner to the inside of the pipe casing, so if a temperature or pressure sensor is to be installed on the pipe, it is difficult to do so, contrary to the principle (10). In addition, the installation structure of the transducer cannot realize partition isolation on the flow channel, so that the principle (7) cannot be realized, and the anti-turbulence influence capability is limited.

Patent publication No. CN 104614026 a provides a transducer in the middle of the lumen of the tube (although the patent describes "two ultrasound reflection means are provided inside", in practice two opposite-emitting transducers should be provided). In the patent, the chamber is provided with an oblate splitter vane, which therefore limits the mounting of the transducer to the center of the tube. Therefore, the flowmeter described in this patent is a mono flowmeter, which does not comply with the principle (3); in addition, in order to facilitate processing and have a seal and an output port for arranging a transducer signal wire in a space, the patent shows that the position of the output port of the transducer signal wire is away from a flange and close to the middle of a pipe section, and the arrangement position of the transducer is just below an outlet port, so the structure does not consider the maximization of a sound path, has a limited range ratio and does not accord with the principle (1).

In summary, for a large-caliber ultrasonic water meter, the eleven principle requirements can be realized as much as possible, and a comprehensive and effective solution is still lacking from the currently published patent.

SUMMERY OF THE UTILITY MODEL

In view of the defects in the prior art, the utility model provides a large-caliber multi-channel partition correlation type ultrasonic flowmeter, namely a horizontal correlation mounting structure of a multi-channel transducer is provided; the sound path maximization principle of the ultrasonic flowmeter is applied; in particular, multi-channel horizontal bijection partition metering modes and implementations are proposed. The structure can inhibit the turbulence influence in the water flow process, can greatly improve the anti-interference capability and the measurement precision of the large-caliber water meter, and conforms to the technical development trend of the large-caliber ultrasonic flow meter.

The performance indexes of the flowmeter are metering accuracy and range ratio, the metering accuracy is the ratio of the flow metering value of the flowmeter to the actual flow value, and the range ratio is the ratio of the common flow to the minimum flow which meets certain metering accuracy requirements, so that the accurate metering range is embodied. Obviously, the influence of turbulence in the water flow process can be inhibited, the higher the metering precision is, the larger the range ratio is, and the better the metering performance of the flowmeter is. In this regard, the following disclosure is further analyzed to draw two important conclusions:

(one) conclusion about the measurement quality of ultrasonic flowmeter

In the field of water metering, range ratio

Is defined as

Wherein, in the step (A),

the flow rate is a given value corresponding to the common flow rate under a certain pipe diameter;

in order to meet the minimum flow rate required by certain metering accuracy (for example, the metering accuracy of the two-stage flowmeter is +/-5%).

The following text, by further analysis and derivation, leads to an important conclusion: measured pick-up flow (i.e., the minimum flow that the meter can sense to measure) for a fluid passing through the meter's piping

The lower (corresponding to the flow rate thereof)

The lower, the

Related to the time difference chip resolution of the ultrasonic flow meter and the pipe structure of the flow meter), in response,

and proportionally lower (i.e., corresponding minimum flow rate)

It becomes low). Generally, in practical applications, the empirical value is

（

The total zero drift generated by the ultrasonic flowmeter circuit and the transducer and the design of the water resistance of the flowmeter pipeline are different). This allows the derivation of a flow rate at a certain bore (through the flow meter line)

And

equal time intervals) of the measuring range ratio

Spaced from two transducers

The relationship between them is:

in the above formula, the first and second carbon atoms are,

is the common flow rate of a certain caliber flow meter,

is prepared by reacting with

The flow rate of the fluid in the corresponding flow meter pipeline,

to meet the minimum flow required for a certain metering accuracy,

is prepared by reacting with

Corresponding flow meter pipelineThe flow rate of the fluid, for a certain bore meter,

and

is a constant (selected value) and,

in the form of a circumferential ratio,

is the inner radius of the flow meter tubing,

in order to be used for metering,

is the distance between the opposite emitting surfaces of the two transducers in the pipeline of the ultrasonic flowmeter,

the included angle between the connecting line of the two transducers in the water flow direction of the pipeline of the flowmeter

Is acute angle when

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

,

is a known quantity related to the time difference of measurement and the speed of sound of the flowmeter,

for known quantities related to the time difference of measurement, the speed of sound of the flowmeter, let

=

Is constant, and

calculating by the equation of time difference of the ultrasonic flowmeter

To obtain that

And thus, in the specific calculation,

according to

And (6) substituting. From above

The following conclusions can be drawn from the relationship of (a):

increase the projection distance between the two transducers in the water flow direction of the flowmeter pipeline

The range ratio of the flowmeter can be effectively improved

。

(II) conclusion of stability of parallel small pipe flow velocity

For the fluid flowing inside the tube, the hydrodynamics states: the Reynolds number index is a behavior criterion for judging whether the fluid flow is laminar flow or turbulent flow (i.e., turbulent flow), and is a measure of the ratio of the inertial force to the viscous force of the fluid, and is a dimensionless number. When the reynolds number is smaller, the influence of the viscous force on the flow field is larger than the inertia force, the disturbance of the flow velocity in the flow field is attenuated due to the viscous force, the fluid flow is stable, and the fluid flow is laminar. On the other hand, if the reynolds number is large, the influence of the inertial force on the flow field is larger than the viscous force, and the fluid flow is unstable, and the minute change in the flow velocity is likely to progress and increase with pulsation, resulting in turbulent and irregular turbulent flow. A theoretical experimental derivation is made here:

setting the inner diameter of the large-diameter straight pipe as

The flow rate of the fluid in the pipe is

The density of the fluid is

The dynamic viscosity of the fluid is

The fluid flow area of the large diameter straight pipe is

The mass flow rate of the fluid is

Reynolds number of the fluid of

. If the fluid of the large-caliber straight pipe is led into a combined flow channel formed by connecting n small-caliber d straight pipes in parallel, and the total fluid flow of the combined flow channel is kept to be the same as that of the large-caliber straight pipe, the flow area of the combined flow channel is kept

The fluid flow area is the same as that of the large-diameter straight pipe, i.e.

Then small in the combined flow passageReynolds number of the fluid in the straight pipe of diameter d is

It can be seen that when

Then, the following conclusions can be drawn:

reynolds number of fluid in small-pipe-diameter d-straight pipe in combined flow passage

Reynolds number smaller than fluid in large-diameter straight pipe

I.e. by

E.g. of

In all, there is

The fact that the Reynolds number of the fluid in the straight pipes with the small diameter d in the combined flow channel is smaller than that of the fluid in the straight pipes with the large diameter is revealed, namely the stability of the fluid flowing in the straight pipes with the small diameter d in the combined flow channel is higher, the pulsation is smaller, and the flow velocity of the fluid measured by ultrasonic wave is more accurate. Especially when the flowmeter is installed in a place with a small space in a pipe well, if the front end or the rear end of the flowmeter is provided with the bent pipe, the strict condition limitation of the length of the front ten straight pipes and the rear five straight pipes at the installation position of the flowmeter cannot be guaranteed, and the metering method of the combined flow channel is adopted, so that the fluid can be automatically rectified, the strict condition limitation of the length of the front ten straight pipes and the rear five straight pipes at the installation position of the flowmeter can be eliminated or reduced, and the metering precision is improved.

The technical scheme of the utility model is as follows: according to the two principles of discussing the technical development trend of the ultrasonic water meter and the principle of an optimized solution in recent years, the ultrasonic transducer is arranged in a mode of maximizing the sound path (namely maximizing the range ratio), the transducer is arranged in a mode of turbulence interference resistance, a flow channel of a partitioned water meter, the shape of a low-pressure-loss flow channel enables the flow channel to be complete, the transducer is arranged in a multi-channel mode, the partitioned metering is carried out, a pipe body is processed (is not cast) by a pipe section, a local sealing mode is adopted, the temperature sensor and the pressure sensor are easy to mount, and the flowmeter is processed and mounted with high consistency. The connection between the ultrasonic water meter and an external pipeline to be measured is a flowmeter tube sleeve, and transducer horizontal fixing bracket structural members which are parallel to each other are respectively arranged at two ends in the I-shaped flowmeter tube sleeve to form a multi-channel ultrasonic transducer horizontal correlation mounting structure; the supporting columns of the transducer horizontal fixing support are correspondingly combined with a plurality of radial subarea diversion clapboards, the transducers are distributed in the center of the transducer horizontal fixing support in an annular manner, and each fan-shaped subarea is provided with a pair (or a plurality of pairs) of transducers to form a structural mode of a multi-channel horizontal opposite emission subarea; a grid structure which is divided into subareas and is formed by a plurality of subarea diversion baffles and outwards radiating by using the central horizontal line of the pipe body sleeve; dividing and isolating a flow channel on the inner cross section of the sleeve pipe of the pipe body according to the number of support columns and a plurality of groups of transducers on a structural member of a transducer horizontal fixing support, dividing the flow channel into a plurality of small fan-shaped flow channels and butting the flow channels with support cylindrical surfaces on transducer horizontal fixing supports at two ends, wherein a pair of transducers are positioned in the middle areas of the front end surface and the rear end surface of each small fan-shaped flow channel to realize subarea metering; arranging an inclined hole structure of a leading-out wire of a hollow support column of a horizontal fixing support of the transducer, leading a total leading-out wire of the transducer out of a fixing seat of the leading-out wire of the transducer, leading the total leading-out wire of the transducer into an instrument circuit box and connecting the total leading-out wire with an integrating circuit PCB; under the cooperation of the temperature sensor fixing seat, the pressure sensor fixing seat, the instrument circuit box and the fixing nuts thereof, the large-caliber multi-channel horizontal partition correlation type ultrasonic flowmeter is formed.

The utility model relates to a large-caliber multi-channel partition correlation type ultrasonic flowmeter which is characterized by comprising a pipe sleeve, an energy converter horizontal fixing support supporting column, a partition flow guide partition plate, an energy converter outgoing line fixing seat, a temperature sensor fixing seat, a pressure sensor fixing seat and an instrument circuit box fixing nut.

The multi-channel ultrasonic transducer horizontal correlation installation structure is formed by arranging two transducer horizontal fixing support structural parts which are parallel to each other in an I-shaped flowmeter pipe sleeve, supporting columns of the transducer horizontal fixing supports are correspondingly combined with a plurality of radial partition flow guide clapboards, the transducers are distributed in the center of the transducer horizontal fixing supports in an annular mode, and each sector partition is provided with one pair (or multiple pairs) of transducers, so that the structural mode of the multi-channel horizontal correlation partition is formed; through the inclined hole structure of the outgoing line of the hollow support column of the transducer horizontal fixing support, two transducer horizontal fixing supports can be arranged at two ends in the tube body sleeve as far as possible, and the total outgoing line of the transducer can be led out from the transducer outgoing line fixing seat and led into the instrument circuit box to be connected with the integrating circuit PCB; under the cooperation of the temperature sensor fixing seat, the pressure sensor fixing seat, the instrument circuit box and the fixing nuts thereof, the large-caliber multi-channel horizontal partition correlation type ultrasonic flowmeter is formed, the maximization of the measuring range ratio, the minimization of the initial flow value and the maximization of the acoustic energy transfer amplitude between the ultrasonic transducers are realized, the characteristics of resisting fluid turbulence interference are realized, the measuring range has very high measuring precision under the condition of various practical application occasions, and the accuracy and fairness of trade settlement are ensured.

The partition flow guide partition plate is a rectangular metal thin plate, and the thickness can be selected according to different calibers of the flow meter. The plurality of the partition flow guide partition plates are in a grid structure formed by radiating outwards by using the central horizontal line of the pipe body sleeve, and are fixed in the pipe body sleeve by the horizontal fixing supports of the energy transducers at two ends. The flow channel is divided and isolated according to the number of a plurality of groups of transducers on the structural part of the transducer horizontal fixing support, the flow channel is divided into a plurality of fan-shaped small flow channels and is butted with the supporting cylindrical surfaces on the transducer horizontal fixing supports at two ends, and the pair of transducers are positioned in the middle areas of the front end surface and the rear end surface of the fan-shaped small flow channels.

The effect of introducing the partition flow guide partition plate and the partition is to follow that the Reynolds number of the fluid in each combined flow channel is smaller than that of the fluid in the large-diameter straight pipe, so that the flowing stability of the fluid in each combined flow channel is higher, the pulsation is smaller, and the flow velocity of the fluid is more accurately measured by ultrasonic waves. Therefore, the metering method of the combined flow channel can not only automatically rectify the fluid, but also eliminate or reduce the strict condition limit that the length of the front ten straight pipes and the rear five straight pipes is required when the flowmeter is installed, and improve the metering precision.

The transducer horizontal fixing support consists of a transducer horizontal fixing support structural part and an annular flow guide cover, is arranged in the flow meter tube body, and is in butt joint with the partition flow guide partition plate and the fixing tube.

The transducer installation and signal wire leading-out operation process comprises the following steps: the structural member of the transducer horizontal fixing support is provided with a structural ring in the center, and the structural ring is connected with an outer ring annular structure of the structural member of the transducer horizontal fixing support through a support pillar; the middle structural ring is internally provided with an energy transducer mounting hole, and the ultrasonic energy transducer and the side sealing ring are mounted in the mounting hole in the structural ring and positioned by the rear convex edge of the ultrasonic energy transducer; the transducer pressing plate is used for pressing and fixing the transducer, and the transducer fixing pressing plate is fixed on the structural ring through a fixing nut; the structure ring is provided with a transducer signal wire for switching a PCB, and the PCB is fixed through a PCB fixing column on the structure ring through hot melting; the outer sides of the water inlet end and the water outlet end of the horizontal fixing support structural member of the energy transducer are provided with annular flow guide covers, so that the energy transducer can be conveniently led out, and the reverse buckle of the annular flow guide covers and the structure ring in the middle of the structural member of the energy transducer fixing support can be clamped and fastened only after the total leading-out wire of the energy transducer is led out from the leading-out wire fixing head. In order to meet the protection requirement of IP68, a two-component high-strength waterproof sealant is injected into the structural ring of the transducer horizontal fixing support through an outlet hole by a flat-head fine needle, so that the transducer, the outlet of the transducer and the structural ring are sealed and fixed.

For the transducer of the application, it is noted that: the water meter committee of the China metering Association defines the specification standards of the ceramic oscillator of the ultrasonic transducer, and the frequencies of the standard are 1MHz, 2MHz and 4 MHz. The transducer with the frequency of 2/4MHz has small volume, short wavelength and high timing trigger precision. With the progress of packaging technology, the industrial technology is applied to gradually change from the frequency of 1MHz, the diameter of a ceramic oscillator phi 12-14 mm and the convex outer diameter phi 17mm multiplied by phi 21mm to the frequency of 2MHz or 4MHz, the diameter of the ceramic oscillator phi 8mm and the convex outer diameter phi 10mm multiplied by phi 14 mm. The ceramic vibrator is 2MHz or 4MHz with phi 8mm, the packaged outer diameter is phi 10mm multiplied by phi 14mm, and the ceramic vibrator is convenient to install in a structural ring due to small sectional area. And because the annular flow guide cover with the large circular through hole in the middle of the structural ring for mounting the energy converter conducts inner and outer flow guide, flow distribution and rectification on fluid, the flow field is stable, and the resistance is small compared with the conventional necking rectification.

In the structural member of the transducer horizontal fixing support, only the transducer total outgoing line passes through the hollow support column at the upper part of the outer ring of the structural ring and is communicated with the inside of the structural ring. The middle hole of the hollow support column for mounting the temperature sensor and the pressure sensor is a through hole and is not communicated with the inside of the structural ring, and the rest support columns are thin solid columns, the outer ring of the structural ring is connected with the inner side of the structural member outer ring of the transducer horizontal fixing support, and the inner tube is circularly divided into fan-shaped areas which are in one-to-one correspondence with the partition flow guide partition plates.

The two transducer horizontal fixing supports are respectively positioned on the inner side of the pipe body sleeve at the position of the pipe body flange, namely the water inlet and the water outlet of the flowmeter. Because the horizontal fixing bracket structural parts of the transducers are respectively used for installing and fixing a plurality of groups of multi-channel horizontal correlation ultrasonic transducers, and the horizontal fixing bracket structural parts of the two transducers can be arranged at the water inlet end and the water outlet end of the inner side of the sleeve flange of the flowmeter, the flow meter can be installed on the flow meter according to the principle that

Where the ultrasonic transducers are horizontally opposed and the ultrasonic waves form an angle with the direction of water flow

，

，

. The structural part of the horizontal fixing bracket of the transducer is close to the port as much as possible, so that the distance L between the transmitting/receiving surfaces of the two ultrasonic transducers is expanded, and the range ratio can be effectively improved. Signals of multiple groups of ultrasonic transducersThe wires are converged and welded on the adapter plate PCB, and a bus signal wire is output, wherein the bus signal wire comprises a positive signal wire and a common ground wire of each transducer; because the two transducer horizontal fixing support structural parts are arranged at two ends of the flow meter sleeve, the total output line of the transducer is butted with the transducer outgoing line fixing head through the inclined hole, and the outgoing line is output.

The inclined hole structure of the outgoing line of the transducer in the middle of the supporting column is arranged to act as: in order to conveniently weld the transducer outgoing line fixing seat, even if the transducer outgoing line fixing seat is arranged at a distance from the inner side of the flange, the transducer main outgoing line can be conveniently led out from the outgoing line fixing head due to the inclined hole structure of the outgoing line. Therefore, the horizontal fixing support of the correlation type transducer, namely the transducer is arranged at the end heads of the water inlet and the water outlet, the distance L of the transducer is still kept at the maximum value, namely the sound path has the maximum value, and the range ratio R is improved.

In addition to increasing the acoustic path, the horizontal convection mounting of the transducer in line with the direction of the water flow also has the benefit of reducing the acoustic energy reception losses due to the mounting of the transducer: experiments show that for plane sound waves, when the transducer is installed in the obliquely inserted and lined inclined hole, the sound path is long, and the effective sound path is short (

) And the requirement on the angle of the inclined hole is very high, the inclined hole deviates a small angle, the sound wave receiving strength is greatly reduced, and different from the angle deviation, when two transducers are horizontally and parallelly installed, if the centers of parallel planes are staggered by 1mm, the sound wave receiving sound energy loss can be ignored for plane waves.

The transducer lead-out wire fixing base is located the body sleeve pipe outside, the lead-out wire fixed head is located the transducer lead-out wire fixing base, inside the lower part embedding transducer fixed bolster structure of lead-out wire fixed head, play the effect of location and fixed transducer fixed bolster structure, with the below of transducer lead-out wire fixing base with central symmetry on the body sleeve pipe, be equipped with temperature sensor seat or pressure sensor seat, respectively in the other one side of the horizontal fixed bolster structure of transducer, play the effect of the fixed transducer fixed bolster structure of cooperation location.

The outgoing line fixing head is used for carrying out height positioning by a positioning surface in the transducer outgoing line fixing seat so as to ensure the height and the flatness of the outgoing line fixing head, and the outgoing line fixing head ensures that an end sealing ring at the lower part of the outgoing line fixing head has reasonable compression amount so as to ensure the sealing between the outgoing line fixing head and a structural member of a transducer fixing support; in addition, the lower part of the leading-out wire fixing head is embedded into the structural part of the transducer fixing support, so that the functions of positioning and fixing the structural part of the transducer fixing support are achieved.

The middle part of the outer side of the outgoing line fixing head is provided with an axial sealing ring which respectively ensures the side sealing of the outgoing line fixing head; and the upper end and the lower end of the leading-out wire fixing head are respectively provided with an end sealing ring, and the end sealing rings are combined with the side sealing to form multi-stage sealing with two different modes, so that the sealing safety level is improved.

The elastic pressing ring is positioned above the outgoing line fixing head and is used for preventing a top sealing ring on the outgoing line fixing head from being damaged when the outgoing line fixing cap is rotated; the convex edge of the outgoing line fixing cap compresses a copper sealing gasket below the convex edge to seal, the lower end of the outgoing line fixing cap compresses an elastic pressing ring above the outgoing line fixing head, and the outgoing line fixing head is fixed under the action of elastic force; the outgoing line fixing head plays a role in safely leading out the outgoing line of the transducer and positioning and fixing the structural member of the horizontal fixing support of the transducer.

The temperature sensor fixing seat is positioned on the outer side of the pipe body sleeve and close to the inner side of the flange at the water outlet end. The temperature sensor fixing head is located in the temperature sensor fixing seat, and the temperature sensor fixing head is provided with a height positioning surface in the temperature sensor fixing seat.

One part of the temperature sensor fixing head is embedded into the structural part of the transducer horizontal fixing bracket to play a role in positioning and fixing the structural part of the transducer horizontal fixing bracket; the elastic pressure ring is positioned above the temperature sensor fixing head, and the temperature sensor fixing cap is positioned above the pressure ring; the temperature sensor fixing cap is sealed by pressing a copper sealing gasket below the temperature sensor fixing cap, and meanwhile, a temperature sensor fixing head is pressed; the temperature sensor fixing cap and the temperature sensor temperature measuring rod are integrally welded and connected, the temperature sensor temperature measuring rod extends out of a through hole in the middle of the transducer hollow supporting column to the central position of the tube body to measure the temperature, and the temperature measuring rod does not influence the measurement of fluid due to the fact that the temperature sensor fixing cap and the temperature sensor temperature measuring rod are installed at the water outlet end.

The pressure sensor fixing seat is located on the outer side of the pipe body sleeve and close to the inner side of the water inlet end flange, the pressure sensor fixing head is located in the pressure sensor fixing seat, and the pressure sensor fixing head is provided with a height positioning surface in the pressure sensor fixing seat.

And a part of the pressure sensor fixing head is embedded into the structural member of the transducer horizontal fixing support, so that the functions of positioning and fixing the structural member of the transducer horizontal fixing support are achieved. The pressure sensor fixing cap is positioned in the pressure sensor fixing seat and is in contact with a spring gasket above the pressure sensor fixing head, a copper sealing gasket is arranged below the edge of the pressure sensor fixing cap, and the pressure sensor fixing head is simultaneously pressed through the pressing sealing gasket. The pressure sensor is different from the temperature sensor in that the pressure measuring part of the pressure sensor does not need to extend out of a through hole in the middle of a hollow support column of a horizontal fixing support of the transducer, so that the pressure sensor is suitable for being installed at the water inlet end and does not block water. The pressure sensor installation in this application, with conventional installation difference lies in, the pressure sensor fixed head has high locating surface in the pressure sensor fixing base, inside some embedding transducer horizontal fixation support structure spare of pressure sensor fixed head, play the effect of location and fixed transducer horizontal fixation support structure spare.

The flow meter is provided with a temperature sensor and a pressure sensor so as to adapt to various practical applications, such as parameter measurement during water supply, heat supply and gas metering.

The instrument circuit box fixing nut is located above the instrument circuit box base, the instrument circuit box base is located on the outer side of the pipe body sleeve between the two flanges, an integrating circuit board, a battery and a display screen are arranged in the instrument circuit box, and the instrument circuit box is fixed in a screw hole formed in the outgoing line fixing seat through the fixing nut in a screwed mode. If IP68 protection is needed, waterproof glue can be filled in the instrument circuit box.

Compared with the large-caliber ultrasonic flowmeter in the prior art, the utility model has the prominent substantive characteristics and remarkable progress, and is represented as follows:

firstly, compared with the large-caliber ultrasonic flow meter with various energy converters of the inclined insertion type installation structure with the same length of the straight-through pipe, the utility model adopts the opposite ultrasonic energy converters arranged on the inlet and outlet interfaces in the straight-through pipe, thereby realizing the maximization of the effective acoustic path measured by the large-caliber ultrasonic flow meter, namely the maximization of the range ratio and the minimization of the initial flow.

Secondly, in the structural member of the transducer horizontal fixing bracket, only the transducer total outgoing line passes through the hollow supporting column at the upper part of the outer ring of the structural ring and is communicated with the inside of the structural ring. The wire outlet hole of the hollow support column on the upper part of the outer ring of the structural ring is an inclined hole, and the inclined hole structure of the outgoing line of the transducer in the middle of the support column is arranged to act as follows: in order to conveniently weld the transducer outgoing line fixing seat, even if the transducer outgoing line fixing seat is arranged at a distance from the inner side of the flange, the transducer main outgoing line can be conveniently led out from the outgoing line fixing head due to the inclined hole structure of the outgoing line. Therefore, the horizontal fixing support of the correlation type transducer, namely the transducer is arranged at the end heads of the water inlet and the water outlet, the distance L of the transducer is kept at the maximum value, namely the sound path is maximized, and the range ratio R is improved.

Thirdly, compared with the large-caliber ultrasonic flowmeter with the same given straight-through pipe length, the utility model adopts a horizontal correlation form of double transducers, sound waves of the double transducers are directly sent and received, and the included angle between the ultrasonic waves and the water flow direction

，

，

The path of sound wave transmission is shortest, and no other components are blocked in the middle, so that the maximization of the transmission of sound wave energy between the ultrasonic transducers is realized, and particularly for the ultrasonic transducersFor a large-caliber water meter, the reliability, accuracy and recognizable performance of the flow meter integrating circuit for processing ultrasonic signals transmitted between the transducers are enabled to obtain the highest performance.

Fourth, the present invention provides a multi-channel zone metering mode, in contrast to conventional ultrasonic flow meters. For a flowmeter with a larger caliber, such as DN400 caliber, according to the structural concept of the utility model, a sectorial partition grid channel can be divided into two parts according to different radiuses by taking the center of an inner pipe as the center of a circle, correspondingly, the transducer is also arranged into two circles by taking the center of the inner pipe as the center of a circle according to different radiuses, so that a metering structure with more partitions is formed, the anti-interference capability is strong, and the metering is more accurate.

Fifth, compared with the large-caliber ultrasonic flowmeter with the same given straight-through pipe length, the straight-through type partition grid channel structure is arranged in the straight-through pipeline of the ultrasonic flowmeter, and the guarantee is provided for adopting independent metering modes in each partition grid channel. Particularly, the Reynolds number of the fluid in each straight-through type partition gate channel is greatly reduced, the flowing stability of the fluid is greatly higher, the pulsation of the fluid is greatly reduced, and the accuracy of the whole metering fluid flow speed and flow of the large-caliber ultrasonic flowmeter is obviously improved. Particularly, under the installation conditions of the following two flowmeters, the straight-through type partition grid channel structure and the independent metering mode in the partition grid channel solve a great problem in the field of flow metering, and greatly reduce the installation limit conditions of the flowmeters. The two flowmeter installation cases are respectively as follows: firstly, limited by an engineering field, a measured fluid pipeline cannot guarantee the straight pipe length requirement specified by the installation of the front-ten-fifth flow meter, so that the measured fluid cannot reach a stable flow condition in the flow meter, and the measurement accuracy of the flow meter is greatly influenced; secondly, limited by the engineering field, the front end or the rear end of the flowmeter is connected with a measured fluid pipeline which is a bent pipe, so that the fluid entering the flowmeter forms a gradient according to the flow rate, the fluid with higher flow rate flows from the bent pipe, one part of the fluid passes through the upper part or the lower part of the transducer, and the transducer cannot measure the time difference comprehensively; while an electromagnetic flowmeter has only one pair of electrodes, this situation is even more significant. It is understood from the above description that the measurement range and accuracy of the flowmeter are greatly affected in the two types of flowmeter mounting.

Sixth, compared with the large-caliber ultrasonic flowmeter with the same given straight-through pipe length, the utility model arranges the straight-through type partition grid channel structure in the straight-through pipeline of the ultrasonic flowmeter, and arranges the horizontal opposite-emitting ultrasonic transducers at the inlet and the outlet of each straight-through type partition grid channel, thereby realizing the independent metering mode in each partition grid channel of the large-caliber ultrasonic flowmeter.

Since the ultrasonic flow meter calculates the fluid flow rate by measuring the forward and reverse time differences of sound waves propagating between two transducers, for a given pipe length, e.g., 300mm, when the fluid flow rate is 1 m/s, the time taken for the time difference measurement is about 0.4ms, and then if the flow channel is divided into 6 segments, the total time taken to complete the respective measurements is 2.4ms, i.e., 0.0024 s, which is quite short. If 100 times of measurement in one second takes 0.24 seconds, it can be seen that the ultrasonic time difference measuring circuit with low power consumption can completely meet the requirement of high-precision real-time measurement on the fluid.

This mode can be expressed as: the ultrasonic flowmeter with large range ratio, high precision and large caliber can adapt to different installation environments and working conditions, and solves a great problem in the field of flow measurement, namely the installation position of the flowmeter is limited by strict conditions of the lengths of the front-ten-rear-five straight pipes.

Seventh, compared with the existing large-caliber ultrasonic flowmeter, the utility model adopts the welding forming of the finished product pipe section in the form of stretching, the pipe wall is thinner than the casting process, the cost is saved, and the intensity is large, and the manufacture is easy;

eighth, compared with the existing large-diameter ultrasonic flowmeter, the transducer of the utility model is installed on the brackets at the two ends in the pipe, so that the pipe wall is not damaged in a concave-convex manner, turbulence, vortex and the like are not generated to the flow of fluid, and the metering stability is improved.

Ninth, compared with the existing large-caliber ultrasonic flowmeter, the utility model adopts the multi-mode local small-sized sealing ring for sealing, thereby greatly improving the safety and the reliability.

Tenth, compared with the existing large-caliber ultrasonic flowmeter, the utility model skillfully installs a pressure sensor (without exposing the head) below the front-end transducer fixing frame, and installs a temperature sensor (without exposing the head but without affecting the measurement) below the rear-end transducer fixing frame. The device is perfectly matched with the horizontal fixing support structural part of the transducer at the water inlet end and the water outlet end, not only plays a role of fixing the horizontal fixing support structural part of the transducer, but also utilizes the characteristic of a hollow support column in the horizontal fixing support structural part of the transducer to penetrate through the horizontal fixing support structural part of the transducer, thereby achieving the purposes of fixing and parameter measurement, combining the two into one, and not only being applied to the measurement of gas or natural gas, but also being applied to the measurement of heating heat energy.

Eleventh, the utility model is a straight-through pipeline without reducing diameter, low pressure loss.

Twelfth, all the devices in the tube body of the utility model are respectively molded by injection molding with the same mold, and have higher consistency and interchangeability, so the fluid characteristics are very close, and the later detection and calibration of mass production flowmeters are convenient.

Thirteenth, compared with the existing large-caliber ultrasonic flowmeter, the utility model has simple structure, low cost, safety and reliability.

Drawings

FIG. 1 is a schematic structural diagram of a large-caliber multi-channel partition correlation type ultrasonic flowmeter;

FIG. 2 is a schematic view of transducer horizontal mounting bracket structure A;

FIG. 3 is a schematic view of transducer horizontal mounting bracket structure B;

FIG. 4 is a schematic view of a transducer horizontal mounting bracket pod configuration;

FIG. 5 is a schematic diagram of a transducer configuration;

FIG. 6 is a schematic view of a transducer lead-out holder;

FIG. 7 is a schematic view of a pressure sensor mount;

FIG. 8 is a schematic view of a temperature sensor mounting;

FIG. 9 is a schematic view of the structure of a partition baffle plate and a guide grid fixing tube;

FIG. 10 is a schematic diagram of an external view of a large-caliber multi-channel partition correlation ultrasonic flowmeter;

in the figure:

11. a water inlet pipe body flange; 12. a water outlet pipe body flange; 21. a pipe body sleeve; 41. a guide grid fixing pipe; 42. a partition flow guide clapboard; 43. tightly fitting a sealing ring; 24. the transducer lead-out wire fixing seat; 246. a lower seal ring; 247. a lead-out wire fixing head; 249. positioning the surface; 244. a top seal ring; 245. a side seal ring; 243. an elastic compression ring; 241. a lead-out wire fixing cap; 242. a copper washer; 313. an outgoing line inclined hole; 22. a pressure sensor holder; 223. an elastic pad; 224. a pressure sensor fixing head; 225. a support post 311 through hole; 226. positioning the surface; 221. a pressure sensor fixing cap; 222. a copper seal gasket; 23. a temperature sensor fixing seat; 234. a temperature sensor fixing head; 233. an elastic pad; 231. a temperature sensor fixing cap; 235. a temperature measuring rod; 236. positioning the surface; 232. a copper seal gasket; a transducer horizontal fixed support structure; 32. an annular dome; 321. the air guide sleeve is reversely hooked; 315. a structural ring; 311/312/313/314 structural ring support posts; 3151. the transducer fixes the pressure plate; 3152, fixing a nut; 331. a transducer signal line; 3153. the signal wire is connected with the PCB in a switching way; 3154, a PCB fixing head; 33. a transducer; 332. a side seal ring; 333. a transducer rear convex edge; 52. the instrument circuit box fixing nut; 284. fixing screw holes; 56. a main outgoing line; an instrument box 51; 51A, a lower case of the instrument box; 51B, an upper shell of the instrument box; 53. integrating the circuit PCB; 54. a display screen; 55. a battery.

Detailed Description

The utility model is described in further detail below with reference to the figures and examples.

Example (b):

the embodiment is a DN100 large-caliber 6-channel horizontal zoning correlation type ultrasonic hot water flow meter for measuring the hot water flow and the heat.

As shown in fig. 1, the present embodiment includes an i-shaped pipe casing 21 with

pipe flanges

11 and 12, a transducer horizontal fixing bracket 31, a partition flow guiding partition plate 42, a transducer outgoing line fixing seat 24, a pressure sensor fixing seat 22, a temperature sensor fixing seat 23, and an instrument circuit box fixing nut 52; in the I-shaped pipe casing 21, a 6-channel ultrasonic transducer horizontal correlation mounting structure is formed by two transducer horizontal fixing support structural parts 31 which are arranged in parallel, the transducers 33 are distributed in the center of the transducer horizontal fixing support 315 in an annular mode, each sector partition is provided with a pair of transducers, a 6-channel horizontal correlation partition structural mode is formed by the combination of 6 radial partition flow guide partition plates 42, and a DN100 large-caliber multi-channel horizontal correlation type ultrasonic flowmeter for measuring hot water flow and heat is formed under the cooperation of the transducer outgoing line fixing seat 24, the pressure sensor fixing seat 22, the temperature sensor fixing seat 23 and the instrument circuit box fixing nut 52.

In this embodiment, the transducer horizontal fixing bracket is composed of a transducer horizontal fixing bracket structural member 31 and an annular air guide sleeve 32; the transducer horizontal fixing support structural parts 31 are positioned at two ends of the inner side of the tube body sleeve 21, and are provided with annular air guide hoods 32; a structural ring 315 is arranged in the center of the structural part 31 of the transducer horizontal fixing bracket; the structural ring 315 is connected with an outer ring structure of the transducer horizontal fixing support structural member 31 through supporting columns 311, 312, 313 and 314; a transducer mounting hole 3155 is formed in the structural ring 315, and the ultrasonic transducer 33 and the side sealing ring 332 are mounted in the mounting hole 3155 in the structural ring 315 and positioned by a rear convex edge 333 of the ultrasonic transducer; the transducer pressing plate 3151 is used for pressing and fixing the transducer 33; the transducer fixing pressure plate 3151 is fixed on the structural ring 315 through a fixing nut 3152; a transducer signal line transfer PCB 3153 is arranged on the structural ring 315; the PCB 3153 is fixed by hot melting through a PCB fixing column 3154 on the structural ring 315; the transducer signal line 331 is soldered on the transfer PCB 3153; the transducer main outgoing line 56 on the PCB 3153 passes through the inclined through hole 313 of the hollow supporting column 314 on the structural ring 315 and is led out through the transducer outgoing line fixing head 24; the outer sides of the water inlet end and the water outlet end of the transducer horizontal fixing support structural member 31 are fastened and sealed by the annular air guide sleeve 32 and the inverted hook 321 on the air guide sleeve and the structural ring 315 for fixing the transducer on the transducer horizontal fixing support structural member 31.

For ease of implementation, the transducer horizontal mounting bracket structure 31 and its transducer 33 mounting and signal line 56 lead-out are described further below.

As shown in fig. 3, in the transducer horizontal fixing bracket structure 31, only the transducer main lead-out wires 56 pass through the hollow support columns 314 on the structural ring 315 to communicate with the interior of the structural ring 315, the

hollow support columns

311 and 312 do not communicate with the interior of the structural ring 315, and the rest of the support columns 313 are relatively thin solid columns.

The transducer lead-out wires 56 and the annular dome 32 are installed in the following order: when the transducer main lead wire 56 is led out from the lead wire fixing seat 24, the barb 321 on the annular air guide sleeve 32 and the edge of the structural ring 315 are butt-jointed and clamped. The annular dome 32 and the structural ring 315 are each provided with a sealing ring 3156 to seal the two internally, so as to ensure that the two are not prone to leakage when glue is poured into the interior. For the protection requirement of IP68, the glue filling process inside the structural ring 315 is as follows: through the outlet of the inclined hole 313 of the outgoing line, a flat-head fine needle is used for injecting the double-component high-strength waterproof sealant into the structural ring 315 of the horizontal fixing support of the transducer, so that the transducer 33, the outgoing line 56 of the transducer and the inner part of the structural ring are sealed and fixed.

The two transducer horizontal fixing supports are respectively positioned on the inner sides of the pipe body sleeves 21 at the positions of the

pipe body flanges

11 and 12, namely the water inlet and the water outlet of the flowmeter. Since the transducer horizontal fixing bracket structural members 31 are used for mounting and fixing 6 sets of multi-channel horizontal correlation ultrasonic transducers respectively, and the two transducer horizontal fixing bracket structural members 31 can be arranged at the water inlet end and the water outlet end of the pipe casing 21, according to the design, the ultrasonic generator can be used for generating ultrasonic waves with different frequencies

Where the ultrasonic transducers are directed horizontally,

，

，

i.e. expandExtending the distance between the transmitting/receiving surfaces of two ultrasonic transducers

The range ratio can be effectively improved.

The signal lines 331 of the 6 groups of ultrasonic transducers are converged and welded on the adapting board PCB 3153, and output a total signal line 56, which includes the positive signal line of each transducer 33 and a common ground line, i.e., a 7-core line. Because the two transducer horizontal fixing bracket structural members 31 are arranged at the two ends of the flowmeter sleeve 21, the transducer main output line 56 is butted with the transducer lead-out wire fixing head 24 through the inclined hole 313 and outputs the lead-out wire 56. The purpose of this kind of inclined hole structure is for convenient transducer lead-out wire fixing base 24 welds and when fixing in the inboard certain distance of flange 12, 13, the transducer still can install in the end of water inlet, delivery port in order to ensure the maximize principle of sound path between the transducer.

In addition to the increased acoustic path, the horizontal convection arrangement of the present invention, which is aligned with the direction of water flow, has the advantages of reducing the ultrasonic acoustic energy reception loss caused by the arrangement of the transducers: experiments show that for the transmission of plane sound waves, when the transducer is installed in the inclined insertion type inclined hole and the lining type inclined hole, the sound path is long, the requirement on the angle of the inclined hole is high, the inclined hole deviates a tiny angle, and the sound wave receiving intensity is greatly reduced; the difference with the angular deviation is that the two transducers are horizontally arranged, and even if the centers of the surfaces of the two transducers are staggered by 1mm during installation, the acoustic energy loss of a receiving end can be ignored.

The partition flow guide partition plate 42 is a rectangular metal thin plate, and a stainless steel thin plate with the thickness of 1mm is selected. The 6 partition flow guide partition plates 42 are formed into a grid structure by radiating the central horizontal line of the flow guide grid fixing tube 41 outwards, are fixed in the flow guide grid fixing tube 41, divide the inner section of the flow meter flow guide grid fixing tube 41 into 6 fan-shaped small flow channels and are in butt joint with the supporting cylindrical surfaces on the horizontal fixing supports of the transducers at two ends according to the number of 6 groups of transducers on the horizontal fixing support structural member 31 of the transducers, and the pair of transducers are positioned in the middle parts of the front end and the rear end of the fan-shaped small flow channels. The two ends of the diversion baffle plate 42 and the diversion grid fixing tube 41 are fixed in the middle of the inner side of the tube body sleeve 21 by a transducer horizontal fixing support.

The introduction of the partition flow guide partition plate 42 and the partition have the effect that the Reynolds number of the fluid in the small-diameter straight pipe in the combined flow channel is smaller than that of the fluid in the large-diameter straight pipe, so that the stability of the fluid flowing in the small-diameter straight pipe in the combined flow channel is higher, the pulsation is smaller, and the flow rate of the fluid is more accurately measured by ultrasonic waves. Therefore, the metering method of the combined flow channel can not only automatically rectify the fluid, but also eliminate or reduce the strict condition limit that the length of the front ten straight pipes and the rear five straight pipes is required when the flowmeter is installed, and improve the metering precision.

As shown in fig. 6, the transducer lead-out wire fixing seat 24 is located outside the tube casing 21, the lead-out wire fixing head 247 is located in the transducer lead-out wire fixing seat 24, and the lower portion of the lead-out wire fixing head 247 is embedded in the transducer fixing support structure 31 to play a role in positioning and fixing the transducer fixing support structure 31. And a pressure sensor seat 22 or a temperature sensor seat 23 is arranged below the transducer leading-out wire fixing seat 24 on the pipe body sleeve 21 in central symmetry, and is respectively arranged at the other side of the transducer horizontal fixing support structural member 31 to play a role in positioning and fixing the transducer fixing support structural member 31. The outgoing line fixing head 247 is highly positioned by a positioning surface 249 in the transducer outgoing line fixing seat 24, so that the height and the smoothness of the outgoing line fixing head 247 are guaranteed, and meanwhile, the reasonable compression amount of a sealing ring 246 at the lower end of the outgoing line fixing head 247 can be guaranteed.

The middle part of the outer side of the outgoing line fixing head 247 is provided with an axial sealing ring 245, which respectively ensures the side sealing of the outgoing line fixing head 247. The upper end and the lower end of the outgoing line fixing head 247 are provided with a top sealing ring 244 and a lower sealing ring 246 which are combined with side sealing to form multi-stage sealing with two different modes, and the sealing safety level is high.

The elastic pressing ring 243 is located above the lead wire fixing head 247, and functions to prevent the top sealing ring 244 on the lead wire fixing head from being damaged when the lead wire fixing cap 241 is rotated. The leading-out wire fixing cap 241 is sealed by compressing the copper sealing gasket 242 under the leading-out wire fixing cap, and the lower end of the leading-out wire fixing cap compresses the elastic pressing ring 243 above the leading-out wire fixing seat to fix the leading-out wire fixing head 247. The lead-out wire fixing head plays a role in safely leading out the transducer lead-out wire 56 from the central hole thereof, keeping the compression amount of the sealing ring 246 constant, embedding a part of the lead-out wire into the transducer horizontal fixing support structural member 31 and positioning and fixing the transducer horizontal fixing support structural member 31.

As shown in fig. 8, the temperature sensor fixing seat 23 is located outside the pipe casing 21 and inside the flange 12 near the water outlet end. The temperature sensor fixing head 234 is located in the temperature sensor fixing seat 23, the temperature sensor fixing head 234 is positioned in height by the positioning surface 236, and a part of the temperature sensor fixing head 234 is embedded in the transducer horizontal fixing support structural member 31 to play a role in positioning and fixing the transducer horizontal fixing support structural member 31. The temperature sensor fixing cap 231 and the temperature measuring rod 235 are integrally welded. The elastic pressing ring 233 is located between the temperature sensor fixing head 234 and the temperature sensor fixing cap 231. The temperature sensor fixing cap 231 is pressed against the copper gasket 232 under the convex edge thereof for sealing, and the temperature sensor fixing head 234 is pressed by pressing the elastic pressing ring 233.

The temperature measuring rod 235 of the temperature sensor extends into the middle of the transducer fixing support from a through hole of the hollow support column 312 to measure the temperature. Because the temperature sensor is arranged at the water outlet end, the flow characteristics of the fluid are not influenced.

As shown in fig. 7, the pressure sensor fixing seat 22 is located outside the pipe casing 21 and near the inside of the inlet end flange 11; the pressure sensor fixing head 224 is located in the pressure sensor fixing seat 22, a part of the pressure sensor fixing head 224 is embedded in the transducer horizontal fixing support structural member 31, and the pressure sensor fixing head 224 is positioned by the positioning surface 226 to play a role in positioning and fixing the transducer fixing support structural member 31.

The elastic pressing ring 223 is located between the pressure sensor fixing head 224 and the pressure sensor fixing cap 221. The pressure sensor fixing cap 221 is sealed by pressing the copper gasket 222 under its flange, and the pressure sensor fixing head 224 is pressed by pressing the elastic pressing ring 223.

The pressure measuring port of the pressure sensor is positioned at the lower end of the pressure sensor fixing cap 221, the opening of the pressure measuring port is communicated with the hollow supporting column 311 of the transducer horizontal fixing support structural member 31 through a through hole in the middle of the pressure sensor fixing head 224, and the hole is directly communicated to the middle 225 of the pipe body, so that the fluid pressure can be measured conveniently without influencing the fluid flow characteristic.

The temperature sensor and the pressure sensor are installed on the flow meter in the embodiment to simultaneously acquire temperature and pressure parameters, convert a heat energy value, compensate temperature change of the flow value and the like when the hot water flow is measured.

The temperature sensor 231 and the pressure sensor 221 are installed to be perfectly matched with the structural member 31 of the transducer horizontal fixing bracket at the water inlet end and the water outlet end, so that the structural member 31 of the transducer horizontal fixing bracket is fixed, the characteristic of a hollow support column in the structural member 31 of the transducer horizontal fixing bracket is utilized, the hollow support column penetrates through the structural member, the purpose of parameter measurement is achieved, the two are combined into one, and the application requirement is met.

The casing of the meter circuit box base 51A is located outside the pipe casing 21 between the two flanges 12 and 13, and the meter circuit box is screwed and fixed in the screw hole 248 on the outgoing line fixing seat 24 through the hole of the casing of the meter circuit box base 51A by the fixing nut 52 through the meter circuit box. And an integrating circuit board 53, a display screen 54 and a battery 55 are arranged in the instrument circuit box. If IP68 protection is needed, waterproof glue can be filled in the instrument circuit box.

The utility model is not only suitable for liquid fluid metering, but also suitable for gas metering (such as gas metering) if device parameters in the liquid fluid are adjusted, such as frequency of a transducer, circuit software and the like. The liquid flow rate may vary but is not compressible, however the gas volume may be compressed and the fluid flow rate may also vary. Therefore, the large-caliber multi-channel multi-circle and multi-partition structure and the partition accurate calculation mode greatly improve and promote the gas metering application, are particularly effective, and can greatly improve the metering accuracy.

The utility model has the advantages of simple structure, low cost, easy implementation, safety, reliability and convenient popularization.

Claims

1. A large-caliber multi-channel partition correlation type ultrasonic flowmeter is characterized by comprising a pipe body sleeve (21), an energy converter (33), an energy converter horizontal fixing support, a structural ring supporting column, a partition flow guide partition plate (42), an energy converter outgoing line fixing seat (24), a temperature sensor fixing seat (23), a pressure sensor fixing seat (22) and an instrument circuit box fixing nut (52); two transducer horizontal fixing bracket structural parts (31) which are parallel to each other are arranged in a pipe sleeve (21) to form a multi-channel ultrasonic transducer horizontal correlation mounting structure; the structure ring support column (314) of the transducer horizontal fixing support structural part is correspondingly combined with a plurality of radial subarea diversion clapboards (42), the transducers (33) are arranged in the center of the transducer horizontal fixing support structural part and distributed in an annular mode, and each fan-shaped subarea is provided with one or more pairs of transducers to form a multi-channel horizontal correlation subarea structure mode; through the inclined positions of the outgoing line inclined holes (313) of the structural ring supporting columns (314) of the transducer horizontal fixing support structural parts, the two transducer horizontal fixing support structural parts can be arranged at the two ends in the tube body sleeve as far as possible, and the transducer main outgoing line (56) can be led out from the transducer outgoing line fixing seat (24) and led into the instrument box (51) to be electrically connected with the totalizing circuit board PCB (53); under the cooperation of the temperature sensor fixing seat (23), the pressure sensor fixing seat (22), the instrument box (51) and an instrument circuit box fixing nut (52), the large-caliber multi-channel horizontal partition correlation type ultrasonic flowmeter is formed.

2. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: the partition flow guide partition plates (42) are rectangular metal sheets, a grid structure is formed by radiating a plurality of partition flow guide partition plates outwards by using a central horizontal line of the pipe body sleeve (21), and the partition flow guide partition plates are fixed in the pipe body sleeve (21) by horizontal fixing supports of transducers at two ends; the flow channel is divided and isolated according to the number of the structural ring supporting columns and the multiple groups of transducers on the transducer horizontal fixing support on the inner section of the flow meter pipe body sleeve (21), the flow channel is divided into a plurality of fan-shaped small flow channels and is butted with the supporting cylindrical surfaces on the transducer horizontal fixing supports at two ends, and the pair of transducers (33) are positioned in the middle of the areas of the front end surface and the rear end surface of the fan-shaped small flow channels.

3. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: the energy converter horizontal fixing support consists of an energy converter horizontal fixing support structural part (31) and an annular flow guide cover (32), is arranged at two ends in a flowmeter body sleeve (21), is butted with a partition flow guide partition plate (42) and a flow guide grid fixing pipe (41), and fixes the partition flow guide partition plate (42) and the flow guide grid fixing pipe (41); a structural ring (315) is arranged in the center of the structural part (31) of the horizontal fixing support of the energy converter, and the structural ring is connected with an outer ring annular structure of the structural part of the horizontal fixing support of the energy converter through a supporting column; a transducer mounting hole (3155) is formed in the structure ring (315), the ultrasonic transducer (33) and the side sealing ring (332) are mounted in the mounting hole (3155) in the structure ring and positioned by a rear convex edge (333) of the ultrasonic transducer; the transducer fixing pressure plate (3151) is used for pressing and fixing a transducer, and the transducer fixing pressure plate (3151) is fixed on the structural ring (315) through a fixing nut (3152); the structural ring is provided with a transducer signal line transfer PCB (3153), and the signal line transfer PCB is fixed through a PCB fixing head (3154) on the structural ring through hot melting; the outer sides of the water inlet end and the water outlet end of the transducer horizontal fixing support structural part (31) are provided with annular air guide hoods (32), and air guide hood barbs (321) on the annular air guide hoods are connected with a structural ring (315) in the middle of the transducer fixing support structural part in a clamping and matching manner.

4. A large-caliber multi-channel partition correlation ultrasonic flowmeter as recited in claim 3, wherein: in the structural member (31) of the transducer horizontal fixing support, only a transducer main outgoing line (56) penetrates through a structural ring support column (314) on the outer ring of a structural ring (315) and is communicated with the interior of the structural ring; the middle holes of the structural ring supporting columns (312) and (311) for mounting the temperature sensor and the pressure sensor are through holes, but are not communicated with the inside of the structural ring, and the rest supporting columns are thin solid columns which are connected with the outer ring of the structural ring and the inner ring of the structural member of the horizontal fixed support of the energy converter and divide the inner tube into circular sector areas which are in one-to-one correspondence with the partition flow guide partition plates (42).

5. A large-caliber multi-channel partition correlation ultrasonic flowmeter as recited in claim 3, wherein: the two transducer horizontal fixing support structural parts (31) are respectively positioned on the inner sides of the pipe body sleeves (21) at the positions of the water inlet pipe body flange (11) and the water outlet pipe body flange (12), namely the water inlet and the water outlet of the flowmeter; a plurality of groups of ultrasonic transducer signal lines (331) are converged and welded on the signal line switching PCB (3153) and output a main outgoing line (56), wherein the main outgoing line comprises a positive electrode signal line and a common ground wire of each transducer.

6. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: the transducer outgoing line fixing seat (24) is located on the outer side of the tube body sleeve (21), an outgoing line fixing head (247) is arranged above the transducer horizontal fixing support structural part (31) and located in the transducer outgoing line fixing seat (24), the lower portion of the outgoing line fixing head (247) is embedded into the transducer horizontal fixing support structural part (31), the transducer horizontal fixing support structural part is located and fixed, and the temperature sensor fixing seat (23) and the pressure sensor fixing seat (22) are arranged below the transducer outgoing line fixing seat (24) on the tube body sleeve in a centrosymmetric mode, and are located and fixed on two sides of the lower portion of the transducer horizontal fixing support structural part (31).

7. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 6, wherein: the outgoing line fixed head (247) is highly positioned by a positioning surface (249) in the transducer outgoing line fixed seat (24) to ensure the height and the smoothness of the outgoing line fixed head (247), ensure that a lower sealing ring (246) of the outgoing line fixed head has reasonable compression amount, limit the depth of the lower part of the outgoing line fixed head (247) embedded into the transducer horizontal fixing support structural part (31), and position and fix the transducer horizontal fixing support structural part.

8. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 6, wherein: the middle part of the outer side of the outgoing line fixing head (247) is provided with a side sealing ring (245), so that the side sealing of the outgoing line fixing head and the upper and lower sealing rings (244) and lower sealing rings (246) of the outgoing line fixing head are respectively guaranteed, and the side sealing rings and the lower sealing rings are combined with the side sealing ring (245) to form multi-stage sealing with two different modes.

9. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 6, wherein: a top sealing ring (244) is arranged above the leading-out wire fixing head (247), and an elastic pressing ring (243) is arranged on the top sealing ring; the lead-out wire fixing cap (241) is positioned above the elastic pressing ring (243), the convex edge of the lead-out wire fixing cap is tightly pressed on a copper gasket (242) below the elastic pressing ring, the elastic pressing ring (243) above the lead-out wire fixing head is tightly pressed at the lower end of the main body of the lead-out wire fixing cap, and the lead-out wire fixing head (247) is fixed; the outgoing line fixing head (247) plays a role in safely leading out the transducer signal line (331) and positioning and fixing the transducer horizontal fixing support structural part (31).

10. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: the temperature sensor fixing seat (23) is located on the outer side of the pipe body sleeve (21) and close to the inner side of the water outlet pipe body flange (12), the temperature sensor fixing head (234) is located in the temperature sensor fixing seat (23), and the temperature sensor fixing head (234) is provided with a height positioning surface (236) in the temperature sensor fixing seat.

11. The large caliber multi-channel zonal correlation ultrasonic flow meter of claim 10, wherein: a part of the temperature sensor fixing head (234) is embedded into the transducer horizontal fixing support structural part (31) to play a role in positioning and fixing the transducer horizontal fixing support structural part; the elastic pad (233) is positioned above the temperature sensor fixing head (234), and the temperature sensor fixing cap (231) is positioned above the elastic pad (233); the temperature sensor fixing cap (231) is sealed by a copper sealing gasket (232) which is tightly pressed below the temperature sensor fixing cap, and meanwhile, a temperature sensor fixing head (234) is pressed; the temperature sensor fixing cap (231) and the temperature sensor temperature measuring rod (235) are integrally welded and connected, and the temperature sensor temperature measuring rod extends out of a central position of the tube body from a through hole in the middle of the transducer structure ring supporting column (314).

12. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: the pressure sensor fixing seat (22) is located on the outer side of the pipe body sleeve (21) and close to the inner side of the water inlet pipe body flange (11), the pressure sensor fixing head (224) is located in the pressure sensor fixing seat (22), and the pressure sensor fixing head (224) is provided with a height positioning surface (226) in the pressure sensor fixing seat.

13. The large caliber multi-channel zonal correlation ultrasonic flow meter of claim 12, wherein: a part of the pressure sensor fixing head (224) is embedded in the transducer horizontal fixing bracket structural part (31); the pressure sensor fixing cap (221) is positioned in the pressure sensor fixing seat (22) and is in contact with an elastic pad (223) above the pressure sensor fixing head (224), and a copper sealing pad (222) is arranged below the edge of the pressure sensor fixing cap (221); the pressure sensor is arranged at the water inlet end; the pressure sensor fixing head (224) is provided with a height positioning surface (226) in the pressure sensor fixing seat (22), and a part of the pressure sensor fixing head (224) is embedded into the transducer horizontal fixing support structural part (31).

14. The large-caliber multi-channel partition correlation ultrasonic flowmeter as claimed in claim 1, wherein: instrument circuit box fixation nut (52) are located instrument box inferior valve (51A) top, and the instrument box inferior valve is located body sleeve pipe (21) outside between two flanges, have totalizing circuit board PCB (53), display screen (54), battery (55) in instrument box (51), fixed in fixed screw (248) of leading-out wire fixing base (24) by instrument circuit box fixation nut (52) screw in, if need the protection of IP68, can the embedment waterproof glue in instrument circuit box.