CN220120163U

CN220120163U - Correlation ultrasonic water meter adapting to constant diameter transducer

Info

Publication number: CN220120163U
Application number: CN202321421887.2U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Juelong Sensing Technology Shenzhen Co ltd
Current assignee: Juelong Sensing Technology Shenzhen Co ltd
Priority date: 2023-06-06
Filing date: 2023-06-06
Publication date: 2023-12-01
Anticipated expiration: 2033-06-06

Abstract

The utility model belongs to the technical field of flow metering equipment, in particular relates to an opposite-type ultrasonic water meter adapting to an equal-diameter transducer, and aims to solve the defect of an opposite-type transducer structure in the prior art. The utility model adopts the following steps: a bracket structure of a transducer is adopted, a small-sized constant-diameter transducer can be installed on the bracket structure, and a wiring channel of a transducer signal wire is sealed and reserved; the device can be embedded with the rectifying tube, and can be butted and sealed with a signal line wiring tube of the rectifying tube. Therefore, the transducers at the two ends of the flowmeter can be arranged at the two ends as far as possible, and the signal wire can be led out from the middle part of the rectifying tube and is electrically connected with the circuit board; in addition, the outer shell is sleeved outside the circuit box and is fixed by the circuit box through the convex edge; the opening of the circuit box is provided with a glass surface in a pressing way; the circuit box is fixed by a screw through a fixing plate on the metal outer tube; the correlation ultrasonic water meter meeting the five principles is formed by the buckling mode of the upper shell and the lower shell.

Description

Correlation ultrasonic water meter adapting to constant diameter transducer

Technical Field

The utility model belongs to the technical field of flow metering equipment, and particularly relates to an opposite-jet ultrasonic water meter adapting to an equal-diameter transducer.

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 standard flow metering devices with good caliber specification compatibility, low pressure loss, large range ratio, high precision, high reliability, no abrasion devices, durability and good economy. Currently, the most widely used all-electronic flow meters worldwide are electromagnetic flow meters and post-harvest 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 metering application requirements of fluid are completely met. In contrast to electromagnetic flowmeters, ultrasonic flowmeters are sampled by time difference digital signals (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, conversion into fluid flow rate and temperature by using acoustic wave active measurement process time difference and synchronous compensation of the measured volume change (for which, an electromagnetic flowmeter needs to be provided with a thermometer), high precision and safety of large-caliber multichannel measurement (the electromagnetic flowmeter only has a pair of coils and corresponding electrodes, which are scrapped after faults), and various low-viscosity liquids (but the electromagnetic flowmeter cannot measure low-conductivity liquid such as purified water), and in addition, measurement/metering of gases such as fuel gas (the electromagnetic flowmeter cannot measure gas flow).

Technological improvements and upgrades of ultrasonic flow meters are rapidly advancing, forming the principle followed by their technological development. In general, the main performance indexes of the flowmeter are metering precision and measuring range ratio, the metering precision is the ratio of the flowmeter magnitude of the flowmeter to the actual flow value, and the improvement of the fluid flow stability and the mass production consistency are important conditions for determining the 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 reflected, and the effective distance between the ultrasonic transducers is increased as 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.

The ultrasonic flowmeter is composed of four parts, namely a time difference integrating circuit, a transducer mounting mode, a flow channel rectifying structure and the like, wherein the performance of the time difference integrating circuit determines the minimum magnitude or resolution of measurable flow, and the overall structure of the ultrasonic flowmeter determines the comprehensive performance and quality of the ultrasonic flowmeter, such as the stability, the signal strength, the range ratio, the production cost and the like of measured fluid. Taking an ultrasonic water meter as an example, particularly according to the constraint of the new national standard R1000 range ratio standard, the optimized solution of the ultrasonic water meter should follow the following principles:

and (one) the sound path maximization principle: in order for an ultrasonic flow meter to have a large turndown ratio, the distance between the ultrasonic transducers, i.e., the sound path, should be made to assume a maximized mode. For the ultrasonic flowmeter, the projection distance between the two transducer spacing connecting lines of the ultrasonic flowmeter and the water flow direction in the pipeline is maximized, so that a larger measuring range ratio and a smaller starting flow can be obtained.

In this regard, through theoretical analysis, the relationship between the acoustic path and the range ratio between the two transducers of the ultrasonic flowmeter can be deduced:

in the water metering field, the turndown ratio R is defined as r=q ₃ /Q ₁ Wherein Q is ₃ The flow is a given value corresponding to the common flow under a certain pipe diameter; q (Q) ₁ 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 fluid passing through the flow meter conduit, the measured pick-up flow (i.e., the minimum flow that the flow meter perceives to be measuring) Q _q The lower (corresponding to its flow velocity V) _q The lower and V _q Time with ultrasonic flow meterPoor chip resolution and flow meter piping structure), and Q ₁ And also proportionally lower (i.e., the corresponding minimum flow velocity V ₁ It becomes lower). Typically, in practice, the empirical value is Q ₁ ＝(5～10)Q _q (Q ₁ 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, Q can be derived at a certain caliber (Q flowing through the flowmeter pipeline ₃ And Q is equal to ₁ The time intervals used are equal), the relationship between the range ratio R and the two transducer spacing L is:

in the above, Q ₃ Is the common flow of a flowmeter with a certain caliber, V ₃ Is equal to Q ₃ Corresponding flow rate, Q, of fluid in the flow meter pipeline ₁ To meet the minimum flow rate required by a certain metering precision, V ₁ Is equal to Q ₁ Corresponding flow rate of fluid in flow meter pipeline, Q for certain caliber flow meter ₃ And V ₃ Is constant (selected value), pi is circumference rate, r is inner radius of flowmeter pipeline, t is distance between opposite emission surfaces of two transducers in ultrasonic flowmeter pipeline, alpha is included angle of connecting line between two transducers in water flow direction of flowmeter pipeline (alpha is acute angle, when alpha=0, connecting line of two transducers is consistent with water flow direction, cos (alpha) =1), k is known quantity related to measuring time difference and sound velocity of flowmeter, beta is known quantity related to measuring time difference and sound velocity of flowmeter, beta=v ₃ 10k is constant and V ₁ V is calculated through a time difference formula of the ultrasonic flowmeter _q Derived, i.e Thus, in the concrete calculation, V ₁ According to V ₁ ＝10V _q Substitution. From the relationship of R aboveThe formula can be concluded as follows:

the projection distance L.cos (alpha) between the two transducers in the water flow direction of the flowmeter pipeline is increased, so that the measuring range ratio R of the flowmeter can be effectively improved.

And (II) a correlation type installation principle: the opposite-emission type acoustic wave signals are directly transmitted and received by the pair of transducers, so that the amplitude of the effective signals is highest, and the method is convenient for adapting to larger sound range. The reflection type has energy loss due to the reflection transmission of sound waves by one or a plurality of reflection surfaces, when the reflection surfaces are large enough, the ideal state sound energy loss is 10-20%, the measurement is generally not affected, but when the reflection surfaces have angle deviation or scale formation after use, the energy loss after reflection can reach 40-60%, and the normal measurement is seriously affected. In addition, there are reflection surfaces, and the mounting structure is complicated, and especially, improper water resistance distribution treatment on the reflection surfaces also affects the measurement accuracy.

(III) principle of transducer miniaturization: as previously mentioned, the transducer is one of four major core elements that make up an ultrasonic flow meter. For the small-caliber ultrasonic flowmeter, the transducer is miniaturized, so that the packaging is convenient, the packaging difficulty and cost are reduced, the yield is improved, and if the transducer is reasonable in structure, the opposite-type installation in a pipeline is also convenient, the use of a sealing ring is reduced, and the fluid flow resistance is reduced; the miniaturization of transducers has two implications: (1) a small transducer with the frequency of 2MHz or 4MHz specified by a standard is used instead of a 1MHz transducer with larger volume, because the 1MHz transducer has large volume and cannot be installed in the caliber of DN15 and DN20 in a correlation way; in addition, compared with a 1MHz transducer, the transducer with the frequency of 2MHz or 4MHz can improve the signal triggering precision of a timing circuit, thereby improving the metering precision. (2) Even if a transducer with the frequency of 2MHz or 4MHz is adopted, an auxiliary structure is required to be added for adapting to the opposite-type assembly and fixation in a small-caliber pipe such as DN15 and DN20, so that the whole volume of the transducer is increased, the manufacturing difficulty is increased, the yield is low, the cost is high (the cost of the transducer is mainly ceramic plate, a shell, labor hour and the like, the volume of the structure is increased, and the shell cost and the labor hour cost are increased by several times to tens times).

(IV) consistency principle: the flow channel forming and processing technology of the ultrasonic water meter base meter has higher assembly installation precision and consistency requirements, and determines the mass production quality of the flowmeter. In particular, the distance between the emitting surfaces of the two transducers is ensured to be constant, the difference caused by tube section processing and transducer installation is avoided, the level is improved, the range of individual error compensation and precision correction of the base table can be reduced, and the complicated workload of manually correcting the individual error in the later period is reduced.

And (V) the principle of simple structure, convenient assembly and low cost: the ultrasonic water meter has the advantages of simplified structure, reduced parts as much as possible, and unique certainty in installation, so that the whole ultrasonic water meter is easy to assemble, stable and reliable, low in cost and high in consistency.

According to the five principles, for the small-caliber ultrasonic flowmeter, the most effective mode is to ensure the stability of structural members in the pipe section of the flowmeter, and simultaneously, the small-size transducer is applied as far as possible, the transducer is installed into a built-in correlation structure, and the transducer signal wires are conveniently led out, and a safe and reliable circuit box with higher protection level is used for installing integrated circuit components.

The patent grant publication number CN 211317425U provides an ultrasonic flowmeter pipe section structure which is a small-caliber correlation structure and meets the requirement of the principle (II); however, as can be seen from fig. 5 of the patent, two ends of the flowmeter pipeline are fixed by the compression rings 4, so that for a flowmeter with a given length, the distance between the sound emitting surfaces of a pair of transducers with the structure is not maximized, and the requirement of the principle (one) cannot be fully met; in addition, as can be seen from fig. 3 and 5 of the patent, the transducer is contained within the second inner tube section 3 with a structure, and the integrated structure is large in size and does not meet the requirement of the third rule.

The patent grant publication number CN 216309097U provides an ultrasonic correlation water meter led out centrally by a DN15 signal line, and as can be seen from the accompanying figure 1 of the patent, a pair of transducers are respectively arranged at two ends of a pipeline, and the ultrasonic correlation water meter is of correlation structure, thereby completely meeting the requirements of the first and second principles; however, as can be seen from fig. 2 of the patent, the transducer is contained within a structural member 22 of the opposite transducer with a structure, and the integrated structure is large and does not meet the requirements of the third rule.

Because the transducer is installed in the small-caliber pipeline, the installation structure, the sealing and the fixing are related, the problems of miniaturization, high waterproof sealing reliability, low cost and convenient assembly and installation of the transducer are very troublesome technological improvement. From the analysis of the above patent publications, the prior art still has drawbacks or deficiencies that do not satisfy the above five principles at the same time, for which a more efficient solution is sought.

Disclosure of Invention

In view of the defects existing in the prior art, the utility model aims to propose the correlation ultrasonic water meter with a brand new structural form by changing the structure of the transducer, the installation mode of the transducer in a pipeline of the flowmeter, the lead-out mode of a signal wire of the transducer, the structural change of a circuit box and other series of process changes and adjustments, and the correlation ultrasonic water meter with the new structure can simultaneously meet the five principles.

The utility model provides a correlation ultrasonic water meter adapting to an equal-diameter transducer, which has the technical scheme that: a bracket structure of a transducer is adopted, a small-sized constant-diameter transducer can be installed on the bracket structure, and a wire passing channel of a transducer signal wire is sealed and reserved; the device can be in scarf joint with the rectifying tube main body of the flowmeter, and can be in butt joint and sealing with the signal line wiring tube of the rectifying tube. Therefore, the transducers at the two ends of the flowmeter can be arranged at the two ends as far as possible, and the signal wire can be led out from the middle part of the rectifying tube, sealed and electrically connected with the circuit board; in addition, the outer shell is sleeved outside the circuit box, and the circuit box is used for fixing the outer shell in a convex edge compression joint mode; the opening of the circuit box can be buckled with the mounting glass surface; the circuit box is fixed by a screw through a fixing plate welded on the metal outer tube; the correlation ultrasonic water meter meeting the five principles is formed by the way that the shell edge on the shell and the shell edge below the shell are mutually buckled and the convex column below the shell is tightly matched with the through hole on the fixed plate.

The utility model relates to a correlation ultrasonic water meter adapting to an equal-diameter transducer, which comprises a metal outer tube, a fixed plate, a fixed seat, a bracket, a rectifying tube, a wire passing tube II, a wire passing tube I, an insert III, a transducer, a lead-out wire, an upper shell, a lower shell, a circuit box, a blind hole column II and a glass surface; the transducer is arranged in a hole IV of the bracket; the bracket is in scarf joint with the rectifying tube; the second wire passing pipe is sleeved with the first wire passing pipe; in addition, the upper shell is sleeved outside the circuit box, and the convex edge II outside the circuit box presses the convex edge I on the upper inner side of the shell to fix the shell; a screw penetrates through a second hole of the fixing plate, is screwed into a second blind hole column, and fixes the circuit box from below; the opening of the circuit box is provided with a glass surface in a pressing way; the second buckle below the shell is buckled with the first buckle on the shell, and meanwhile, the first blind hole column below the shell passes through the first hole of the fixed plate to be in close fit connection; the transducer signal wire passes through the second wire passing tube and the first wire passing tube and extends out of the positioning hole to be electrically connected with the circuit board, so that the correlation ultrasonic water meter meeting the five principles is formed.

The transducer is tightly matched in a hole IV on the bracket, and further, the convex edge is tightly matched with the curved surface I, and the positioning surface VI is in contact fit with the positioning surface III.

The bracket is in scarf joint with the rectifying tube, epoxy resin is coated between the bracket and the rectifying tube for bonding, the second sealing ring and the third sealing ring are respectively arranged in a groove II and a groove III which are symmetrical on two sides of the middle part of the outer side of the rectifying tube, and the rectifying tube is screwed into a middle hole of the fixing seat by a bolt to fix the positioning hole; further, the first insert and the second insert are respectively embedded into the first positioning groove and the second positioning groove; meanwhile, the second wire passing pipe is tightly embedded into the first wire passing pipe, and is positioned by the contact of the first positioning surface and the fourth positioning surface.

And the third insert is tightly matched with the third hole on the bracket in an embedded manner, epoxy resin is coated between the third insert and the third hole for bonding, and the fifth positioning surface is in contact positioning with the second positioning surface.

The glass surface is arranged at the opening position of the circuit box and is sealed by a sealing ring IV in a second fastening and positioning surface seven positioning and compression groove IV of the guard edge; further, the groove five divides the guard edge into two sections, so that the guard edge two obtains the elasticity expanding outwards.

The shell is sleeved outside the circuit box, the first convex edge is aligned with the second convex edge by rotating the shell, and the first convex edge is arranged below the second convex edge; further, the first convex edge and the second convex edge are matched, and a plurality of pairs can exist.

The fixing plate is made of metal materials, is positioned on the other side of the fixing seat of the metal outer tube and is perpendicular to the fixing seat, and is fixed by welding between a side line which is parallel and tangential with the metal outer tube through a notch of the groove and the metal outer tube.

The second blind hole column is arranged at the outer side of the bottom surface of the circuit box and is divided into two rows which respectively straddle at two sides of the metal outer tube, and meanwhile, the hollow column in the center of the circuit box is sleeved at the outer side of the fixed seat and is sealed by the first sealing ring; the second row of blind hole columns are contacted with the fixed plate, and are connected with blind holes of the second blind hole columns through the second holes by screws.

The second buckle below the shell is clamped with the first buckle on the shell, and meanwhile, the first blind hole column below the shell passes through the first hole of the fixing plate and is in close fit connection with the first blind hole column; furthermore, the head of the first blind hole column is provided with a cross division groove, so that the blind hole column is convenient to be tightly matched with the first blind hole column.

The second curved surface at the contact part of the middle part of the outer side of the bottom surface of the circuit box and the outer side of the metal outer tube is matched with the cambered surface with the same diameter as the metal outer tube.

In summary, compared with the prior art, the utility model has outstanding substantial improvements and significant progress, and is specifically expressed as follows:

first, the (one) sound path maximization principle and (two) correlation installation principle are satisfied: the technical scheme adopted by the utility model is that a pair of transducers are arranged at two ends of a rectifying tube in a flow passage of a metal outer tube in a correlation way, and a wire passing channel is arranged, so that a transducer signal wire can be led out from the middle part of the metal outer tube; therefore, for an ultrasonic flowmeter given according to standard length requirements, a pair of transducers can be embedded and arranged at two ends of a pipeline as separately as possible without considering other installation factors, so that maximization of sound path, i.e. maximum value of range ratio, can be achieved between the pair of transducers.

Second, the (three) transducer miniaturization principle is satisfied: the technical proposal adopted by the utility model is based on the miniaturization of the surrounding transducer and the simplification of the installation, so that the miniature equal-diameter cylindrical transducer is easy to package, and the transducer bracket can be manufactured by materials with different prices, thereby not only reducing the cost, but also improving the yield.

Thirdly, the consistency principle of (four) is satisfied: because the transducer and the transducer bracket are positioned, the embedding between the transducer bracket and the whole sleeve and the sleeving between the wiring pipes are positioned; the flow channels between the transducer support and the integral sleeve are processed by a precision die and engineering plastics in an injection molding way, so that the flow characteristics of pipelines of different flow meters and the flow in the pipelines are consistent, and the calibration work of the batch flow meters in the later period is greatly simplified.

Fourth, make things convenient for subassembly structure assembly and signal line to draw forth: according to the technical scheme, except that the circuit box is fixed by adopting an internal screw, the rectifying tube is fixed in the middle by a bolt, the circuit box is fixed on the shell, the glass surface is connected with the circuit box in a clamping way, the lower part of the shell is connected with the upper part of the shell in a clamping way, the appearance of the flowmeter is not fixed by the screw, and the flowmeter is very convenient to install. The signal wires of the transducers positioned at the two sides of the metal outer tube can be conveniently led out from the middle part of the metal outer tube, which is a great difficulty of the small-caliber correlation flowmeter. By adopting the technical scheme of the utility model, the third hole for the outgoing line is reserved on the bracket, so that the transducer and the bracket can be assembled firstly, then the bracket and the rectifying tube are assembled, and at the moment, the signal line is arranged outside two sides of the rectifying tube; and then the whole of the bracket and the rectifying tube is penetrated into the metal outer tube, then the signal wires positioned at the outer ends of the two sides of the metal outer tube are penetrated into the wire passing tube II and the wire passing tube I, pulled out from the middle hole of the fixing seat, and the threading process is easy to complete.

Fifth, reduce costs: the whole structure transducer comprising the flow tube and the supporting column thereof is integrated into zero, so that the cost is reduced. Firstly, the weight of the equal-diameter cylindrical transducer is about 1/8 of that of the transducer with an integral structure, the transducer is made of PPS and PEEK materials at present, a transducer bracket can use PPO, and the cost of the transducer is 2-3 times higher than that of the PPO; and PPS has 20-30 times higher cost than common PPO, so the cost of separation and combination is low. Secondly, because the guide cover is required to be installed, the transducer with an integral structure has deeper blind holes for packaging the ceramic plates in the middle, and the blind holes are about 15mm, so that difficulties are brought to the packaging operation of the ceramic plates and the exhaust of the colloid, and the yield is reduced; the blind hole of the small-sized equal-diameter transducer is only smaller than 10mm, the outer diameter of the transducer is 10mm, the transducer is easy to stack, the device is more suitable for automatic operation, the packaging yield is high, and the packaging cost can be reduced.

Sixth, the sealing performance of the flowmeter circuit box is improved: in the technical scheme of the utility model, the transducer is tightly matched with the bracket, the bracket wire passing pipe and the rectifying pipe wire passing pipe and is glued; the glass surface is introduced into the round plastic box surface to serve as a sealing surface, so that the problem of ageing resistance and deformation of the rectangular box body are avoided, namely, the opening of the circuit box is sealed by the glass surface in a traditional and reliable sealing mode, and the waterproof sealing of the signal wire and the circuit part is safe and reliable by applying the technical scheme of the utility model.

In conclusion, by implementing the technical scheme of the utility model, five principles can be simultaneously satisfied, and the device has the advantages of ensured performance, simple structure, convenient assembly and low cost.

Drawings

FIG. 1 is a schematic view of an external view of an correlation ultrasonic meter fitted with an equal diameter transducer;

FIG. 2 is a cross-sectional view of an opposite-type ultrasonic water meter fitted with an equal diameter transducer;

FIG. 3 is a schematic top view of an opposite-type ultrasonic water meter housing with an adaptive constant diameter transducer;

FIG. 4 is a schematic diagram of a correlation ultrasonic meter circuit box that fits an equal diameter transducer;

FIG. 5 is a schematic diagram of a correlation ultrasonic meter transducer holder insert that fits an equal diameter transducer;

FIG. 6 is a schematic diagram of a correlation ultrasonic water meter transducer support structure adapted to an equal diameter transducer;

FIG. 7 is a schematic diagram II of a correlation ultrasonic water meter transducer support structure adapted to an equal diameter transducer;

FIG. 8 is a schematic diagram of an assembled transducer mount and its mount insert, transducer and metal conduit;

FIG. 9 is an exploded view of the transducer mount assembly and rectifier tube installation;

FIG. 10 is a sectional view of the mounting of the transducer support assembly with the rectifier tube, the metal outer tube;

FIG. 11 is a partial cross-sectional view of the metal outer tube, the circuit box, the housing, and the mounting above and below the housing;

FIG. 12 is a schematic view of the structure of the metal outer tube and its fixing plate;

fig. 13 is a schematic diagram of the threading of transducer signal lines within a transducer holder and rectifier tube.

In the figure:

11. a metal outer tube; 112. an external thread A;113. an external thread B;12. a fixing plate; 121. a screw; 122. a groove I; 123. a first hole; 124. a second hole; 13. a fixing seat; 131. a first sealing ring; 132. a bolt; 21. a bracket; 211. a fairing; 212. an insert I; 213. an insert II; 214. a first positioning surface; 215. a second positioning surface; 216. hole III; 217. a fourth hole; 218. a positioning surface III; 219. a first curved surface; 22. rectifying tube; 220. a second wire passing pipe; 221. a first wire passing pipe; 222. positioning holes; 223. a second sealing ring; 224. a third sealing ring; 225. a positioning surface IV; 226. a positioning groove II; 227. a positioning groove I; 228. a second groove; 229. a fifth hole; 230. a groove III; 24. an insert III; 241. a positioning surface V; 33. a transducer; 331. protruding ridges; 332. a positioning surface six; 333. a lead-out wire; 41. a housing; 411. a first convex edge; 412. a first guard edge; 413. a lead sealing ring I; 414. buckling; 415. arc edges; 42. the lower part of the shell; 421. a first blind hole column; 422. a lead sealing ring II; 423. buckling II; 51. a circuit box; 511. a second convex edge; 512. a first convex column; 5121. a second convex column; 513. a blind hole column II; 514. a groove IV; 515. a second guard edge; 516. a groove V; 517. a second curved surface; 518. a hollow column; 519. a positioning surface seven; 61. a glass surface; 62. a sealing ring IV; 63. a display screen; 64. a circuit board; 65. and a battery.

Detailed Description

Embodiment one:

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

As shown in fig. 1, the embodiment is a DN15 caliber correlation ultrasonic water meter adapting to a constant diameter transducer, which comprises a metal outer tube 11, a fixed plate 12, a fixed seat 13, a bracket 21, a rectifying tube 22, a second wire passing tube 220, a first wire passing tube 221, a third insert 24, a transducer 33, an outgoing wire 333, an upper shell 41, a lower shell 42, a circuit box 51, a second blind hole column 513 and a glass surface 61; the transducer 33 is mounted in the fourth hole 217 of the bracket 21; the bracket 21 is in scarf joint with the rectifying tube 22; the second wire passing pipe 220 is sleeved with the first wire passing pipe 221; in addition, the upper shell 41 is sleeved outside the circuit box 51, and the convex edge I411 on the inner side of the upper shell is pressed by the convex edge II 511 on the outer side of the circuit box 51 to fix the upper shell 41; the second blind hole column 513 is screwed in by a screw 121 penetrating through the second hole 124 of the fixing plate, and the circuit box 51 is fixed from below; the opening of the circuit box 51 is provided with a glass surface 61 in a pressing way; the second buckle 423 of the lower shell 42 is buckled with the first buckle 414 of the upper shell 41, and meanwhile, the first blind hole column 421 of the lower shell 42 passes through the first hole 123 of the fixed plate 12 to be in close fit connection; the signal wire 333 of the transducer passes through the second wire passing pipe 220 and the first wire passing pipe 221 and extends out of the positioning hole 222 to be electrically connected with the circuit board 64, so that the correlation ultrasonic water meter meeting the five principles is formed.

As shown in fig. 7 and 8, the transducer 33 is tightly fitted in the hole four 217 of the bracket 21, and is bonded by epoxy resin, and further, the convex ridge 331 is tightly fitted with the curved surface one 219, and the positioning surface six 332 is in contact fit with the positioning surface three 218.

As shown in fig. 9, the bracket 21 is embedded with the rectifying tube 22, epoxy resin is coated between the bracket and the rectifying tube, the second sealing ring 223 and the third sealing ring 224 are respectively arranged in a second groove 228 and a third groove 230 which are symmetrical on two sides of the middle part of the outer side of the rectifying tube 22, and the rectifying tube is screwed into a middle hole of the fixing seat 13 by a bolt 132 to fix the positioning hole 222; further, the first insert 212, the second insert 213 are respectively embedded into the first positioning groove 227 and the second positioning groove 226; at the same time, the second conduit 220 is tightly embedded in the first conduit 221, and is bonded by epoxy resin, and is positioned by the contact of the first positioning surface 214 and the fourth positioning surface 225.

As shown in fig. 6 and 8, the third insert 24 is tightly fitted with the third hole 216 of the bracket 21, and is bonded by epoxy resin, and the fifth positioning surface 241 is in contact with the second positioning surface 215.

As shown in fig. 2 and 4, the glass surface 61 is arranged at the opening position of the circuit box 51 and is sealed by a sealing ring IV 62 which is fastened by a second guard edge 515, positioned by a seventh positioning surface 519 and compressed in a fourth groove 514; further, groove five 516 divides guard two 515 into segments, thereby providing guard two with the ability to expand outwardly.

As shown in fig. 2, 3 and 4, the housing 41 is sleeved outside the circuit box 51, and the first flange 411 is aligned with the second flange 511 by rotating the housing, and the first flange is below the second flange, that is, the first flange 411 is pressed by the second flange 511; further, the first convex edge and the second convex edge are matched, and a plurality of pairs can exist.

As shown in fig. 12, the fixing plate 12 is made of metal material, is positioned on the other side of the fixing seat 13 on the metal outer tube 11 and is perpendicular to the fixing seat, and is fixed by welding between the metal outer tube and a side line parallel and tangential to the metal outer tube through a notch of the first groove 122.

As shown in fig. 4 and 11, the second blind hole column 513 is arranged at the outer side of the bottom surface of the circuit box 51 and divided into 4 rows, and spans two sides of the metal outer tube 11 respectively, and meanwhile, the hollow column 518 in the center of the circuit box 51 is sleeved at the outer side of the fixed seat 13, and is sealed by the first sealing ring 131; the second row of blind hole posts 513 are contacted with the fixed plate 12, and then the screws 121 are connected with the blind holes of the second row of blind hole posts 513 through the second holes 124.

As shown in fig. 11, the second buckle 423 of the lower shell 42 is clamped with the first buckle 414 of the upper shell 41, and meanwhile, the first blind hole column 421 of the lower shell passes through the first hole 123 of the fixing plate 12 to be tightly connected with the first blind hole column; further, the head of the blind hole post 421 has a cross-shaped dividing groove, which can be tightly matched with the hole 123.

As shown in fig. 11, the contact between the curved surface two 517 on the outer side of the bottom surface of the circuit box 51 and the outer side of the metal outer tube 11 is an arc surface with the same diameter as the metal outer tube.

In order to facilitate the passage of impurities and reduce the pressure loss, the minimum clearance in the pipeline of the flowmeter is generally required to be larger than 3mm (for example, the clearance of a filtering grid of a single-flow-rate small-caliber water meter is 2.5-3 mm), so that for a correlation ultrasonic water meter with DN15 caliber and adapting to an equal-diameter transducer, the minimum clearance is 3.75mm, the requirement is met, and the calculation process is as follows: (26.5 mm-5mm-2-12 mm)/2=3.75 >3mm, where 26.5mm is the outer diameter of DN15 caliber, 2.5mm is the metal tube wall thickness, 1mm is the stent tube wall thickness, 12mm is the outer diameter of the bore two mounting a 10mm constant diameter transducer.

DN15 caliber correlation ultrasonic water meter adapting to constant diameter transducer, the assembly process is as follows:

(1) As shown in fig. 8, the transducer 33 is fitted into the fourth 217 hole of the bracket 21 with an epoxy adhesive applied therebetween. (2) As shown in fig. 13, 7 and 6, the signal wire 333 of the transducer 33 passes through the fifth 229 and the third 216 of the bracket 21.

(3) As shown in fig. 9, the bracket 21 is embedded with the rectifying tube 22, and epoxy resin is coated between the bracket and the rectifying tube for bonding; and the second sealing ring 223 and the third sealing ring 224 are respectively arranged in the second symmetrical groove 228 and the third symmetrical groove 230 in the middle part of the outer side of the rectifying tube 22, then the rectifying tube is integrally arranged in the metal outer tube 11, and the bolt 132 is screwed into the middle hole of the fixed seat 13 to be matched with the screw thread so as to fix the positioning hole 222.

(4) As shown in fig. 2, the signal wire 333 of the transducer 33 passes through the second wire passing pipe 220 and the first wire passing pipe 221 and is penetrated out of the hole in the fixing seat 13.

(5) As shown in fig. 5 and 6, the third insert 24 is inserted into the third hole 216 of the bracket 21 with an epoxy adhesive applied therebetween.

(6) As shown in fig. 2 and 4, the circuit board 64 is fixed on the second pillar 5121 and is electrically connected to the signal line; the battery 53 is placed in the circuit box and connected to the circuit board.

(7) As shown in fig. 4, the fourth sealing ring 62 is placed in the fourth groove 514, and the glass surface 61 is pressed and buckled at the opening of the circuit box. (8) As shown in fig. 2, the case 41 is fitted over the outside of the circuit box 51, and the second flange 511 is pressed against the first flange 411 by rotating the case.

(9) As shown in fig. 11, two rows of blind hole columns II 513 are spanned on two sides of the metal outer tube 11, and meanwhile, a hollow column 518 in the center of the circuit box 51 is sleeved on the outer side of the fixed seat 13, and the hollow column 518 is sealed by a first sealing ring; the two rows of blind hole columns II 513 are contacted with the fixed plate 12, and are connected with blind holes of the blind hole columns II 513 through the holes II 124 by screws 121.

(10) As shown in fig. 11, the second button 423 of the lower housing 42 is engaged with the first button 414 of the upper housing 41, and the first blind hole 421 of the lower housing passes through the first hole 123 of the fixing plate 12 to be tightly connected therewith, thereby completing the assembly.

It should be noted that, for convenience of maintenance, the glass surface can be removed from the circuit box by using the expander, and the components such as a battery can be repaired or replaced, and the glass surface of the circuit box is protected by the guard edge on the housing after the flowmeter is installed.

The embodiment of the utility model is used for implementing the correlation ultrasonic water meter adapting to the constant diameter transducer in DN15 caliber correlation ultrasonic water meter adapting to the constant diameter transducer, and the implementation and application are described, but the utility model is not limited to the specific embodiment, and any modification or variation based on the content of the utility model is within the scope of the utility model.

Claims

1. The opposite-type ultrasonic water meter is characterized by comprising a metal outer tube (11), a fixed plate (12), a fixed seat (13), a bracket (21), a rectifying tube (22), a second wire passing tube (220), a first wire passing tube (221), a third insert (24), a transducer (33), an outgoing wire (333), an upper shell (41), a lower shell (42), a circuit box (51), a second blind hole column (513) and a glass surface (61); the transducer (33) is arranged in a hole IV (217) of the bracket (21); the bracket is in scarf joint with the rectifying tube (22); the second wire passing pipe (220) is sleeved with the first wire passing pipe (221); in addition, the upper shell (41) is sleeved outside the circuit box (51), and the upper shell (41) is fixed by pressing the first convex edge (411) on the inner side of the upper shell through the second convex edge (511) on the outer side of the circuit box (51); a screw (121) penetrates through a second hole (124) of the fixing plate, is screwed into a second blind hole column (513), and fixes the circuit box (51) from below; the opening of the circuit box (51) is provided with a glass surface (61) in a pressing way; the second buckling part (423) of the lower shell (42) is buckled with the first buckling part (414) of the upper shell (41), and meanwhile, the first blind hole column (421) of the lower shell (42) passes through the first hole (123) of the fixed plate (12) to be in close fit connection; the leading-out wire (333) of the transducer passes through the second wire passing pipe (220) and the first wire passing pipe (221) and extends out of the positioning hole (222) to be electrically connected with the circuit board (64).

2. The correlation ultrasonic water meter adapting to the constant diameter transducer according to claim 1, wherein the transducer (33) is tightly fitted in a hole IV (217) on the bracket (21), and further, the convex ridge (331) is tightly fitted with a curved surface I (219), and the positioning surface six (332) is in contact fit with a positioning surface III (218).

3. The correlation ultrasonic water meter adapting to the constant diameter transducer according to claim 1, wherein the bracket (21) is in scarf joint with the rectifying tube (22); the second sealing ring (223) and the third sealing ring (224) are respectively arranged in a second groove (228) and a third groove (230) which are symmetrical on two sides of the middle part of the outer side of the rectifying tube, and the rectifying tube is screwed into a middle hole of the fixed seat (13) by a bolt (132) to fix the positioning hole (222); further, the first insert (212), the second insert (213) are respectively embedded into the first positioning groove (227) and the second positioning groove (226); at the same time, the second wire passing pipe (220) is tightly embedded into the first wire passing pipe (221) and is positioned by the contact of the first positioning surface (214) and the fourth positioning surface (225).

4. The correlation ultrasonic water meter with the constant diameter transducer according to claim 1, wherein the third insert (24) is tightly fitted with the third hole (216) on the bracket, and the fifth positioning surface (241) is in contact with the second positioning surface (215).

5. The correlation ultrasonic water meter adapting to the constant diameter transducer according to claim 1, wherein the glass surface (61) is arranged at the opening position of the circuit box (51) and is sealed by a sealing ring IV (62) in a sealing groove IV (514) positioned and compressed by a second guard edge (515) fastening and positioning surface seven (519); further, groove five (516) divides guard two (515) into multiple segments.

6. The correlation ultrasonic water meter with the constant diameter transducer according to claim 1, wherein the housing (41) is sleeved outside the circuit box (51), and the convex edge (411) is arranged below the convex edge (511) by rotating the housing, and further, the convex edge (I) and the convex edge (II) can be paired, so that a plurality of pairs can be formed.

7. The correlation ultrasonic water meter adapting to the constant diameter transducer as set forth in claim 1, wherein the fixing plate (12) is made of metal material, is positioned on the other side of the fixing seat (13) of the metal outer tube (11) and is perpendicular to the fixing seat, and is fixed by welding between a side line parallel and tangential to the metal outer tube through a notch of the groove I (122) and the metal outer tube.

8. The correlation ultrasonic water meter adapting to the constant diameter transducer according to claim 1, wherein the second blind hole column (513) is arranged outside the bottom surface of the circuit box (51), straddles the two sides of the metal outer tube (11) respectively, contacts with the fixed plate (12), and the screw (121) is connected with the blind hole of the second blind hole column (513) through the second hole (124); further, a hollow column (518) in the circuit box (51) is sleeved outside the fixed seat (13), and the hollow column and the fixed seat are sealed by a first sealing ring (131).

9. The correlation ultrasonic water meter with the adaptive constant diameter transducer as claimed in claim 1, wherein the second buckle (423) of the lower housing (42) is clamped with the first buckle (414) of the upper housing (41), and the first blind hole post (421) of the lower housing passes through the first hole (123) of the fixed plate (12) to be tightly connected with the first blind hole post; further, the head of the first blind hole column (421) is provided with a cross-shaped dividing groove.

10. The correlation ultrasonic water meter adapting to the constant diameter transducer according to claim 1, wherein the contact part of the curved surface II (517) at the middle part of the outer side of the bottom surface of the circuit box (51) and the outer side of the metal outer tube (11) is matched with the arc surface of the constant diameter of the metal outer tube.