CN115900862A

CN115900862A - Centered outgoing line and sealing structure of DN15 ultrasonic correlation type water meter

Info

Publication number: CN115900862A
Application number: CN202110937761.XA
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: 2021-08-16
Filing date: 2021-08-16
Publication date: 2023-04-04

Abstract

The invention belongs to the technical field of flow metering equipment, in particular to a centered outgoing line and a sealing structure of a DN15 ultrasonic correlation water meter, aiming at solving the problems that in the prior art, the correlation ultrasonic DN15 caliber water meter has the defects that the water flow gap in the pipe is too small, the metering range ratio is low due to the adoption of a reducing adapter and the difference between the six principles of the optimized solution scheme of the technical development of the ultrasonic water meter is poor, and by arranging a fully-sealed special outgoing line channel and arranging a metal wire passing sealing pipe for a transducer signal wire, the ultrasonic transducer is arranged close to the inner side of two ends of an equal-diameter metal outer pipe in a correlation layout manner, and the signal wire is conveniently led out from the middle of the pipe. The invention uses the equal-diameter metal outer pipe as a central framework, and realizes the maximization of the measuring range ratio and the minimization of the initial flow value under the condition of ensuring enough water flow clearance in the water meter pipe under the optimized layout and cooperation of the transducer outgoing line fixing seat, the metal wire passing sealing pipe and the transducer outgoing line fixing head.

Description

Centered outgoing line and sealing structure of DN15 ultrasonic correlation type water meter

Technical Field

The invention belongs to the technical field of flow metering equipment, and particularly relates to a centered outgoing line and a sealing structure of a DN15 ultrasonic correlation water meter.

Background

In the era of Internet of things big data, artificial intelligence and industrial automatic control, for the fields of industrial and civil water, heat and gas supply and metering, a mechanical or electromechanical combined mode flowmeter is gradually replaced by an all-electronic mode flowmeter, and the irreversible big trend is formed.

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, electromagnetic flow meters and after-market ultrasonic flow meters are the most widely used worldwide for all-electronic flow metering.

The ultrasonic flowmeter is developed along with the technical breakthrough of time difference timing chips (2012-2017, international companies such as AMS, D-FLOW, TI and the like successively provide advanced time difference timing chips, 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). Compared with an electromagnetic flowmeter, the ultrasonic flowmeter performs sampling through time difference digital signals (the electromagnetic flowmeter performs sampling through analog signals). Taking an ultrasonic water meter as an example, the ultrasonic water meter has the outstanding technical advantages that: the device has the advantages of smaller initial flow (such as liquid with flow velocity of 0.8-1 mm/s), wider range ratio, capability of actively measuring process time difference by sound waves, conversion into fluid flow velocity and temperature and synchronous compensation of measured volume change (for this, an electromagnetic flowmeter needs to be provided with a thermometer), higher precision and safety of large-caliber multi-channel measurement (the electromagnetic flowmeter only has one pair of coils and corresponding electrodes and is scrapped when being failed), capability of measuring various low-viscosity liquids (the electromagnetic flowmeter cannot measure low-conductivity liquids such as pure water), and capability of measuring/metering gases such as gas (the electromagnetic flowmeter cannot measure gas flow).

In general, the main performance indexes of the flow meter are 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 precision; the measuring range ratio is the ratio of the common flow to the minimum flow under the guarantee of the measuring precision of the flowmeter, the range capable of accurately measuring is reflected, and the necessary condition for improving the measuring range ratio is to increase the effective distance between the ultrasonic transducers. Obviously, the higher the metering accuracy and the larger the range 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 an ultrasonic 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 the ultrasonic water meter, particularly the most common DN15 caliber is used, 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. To make an ultrasonic water meter have a large range ratio, the projection distance of the distance connecting line between 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 smaller initial flow (for the water meter, the national standard is to increase the maximum value of the range ratio or the flow ratio to R =1000 in 2018).

In this regard, theoretical analysis can lead to conclusions about the quality of the ultrasonic flow meter:

in the field of water metering, ratio of measuring ranges

Is defined as

Wherein, in the process,

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

minimum flow to meet certain metering accuracy requirements (e.g. two-stage flow meter)The measurement accuracy of (d) 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) for a fluid passing through the meter's piping

The lower (corresponding to the flow rate thereof)

The lower the

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

also proportionally lower (i.e., corresponding to a minimum flow rate)

It becomes lower). Usually, 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 conduit,

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

is prepared by reacting with

The flow velocity of the fluid in the corresponding flow meter pipeline is, for a certain caliber flow 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 use the liquid in a metering way,

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 meter time difference and the speed of sound of the flow meter,

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

=

Is constant, and

calculating by using equation of time difference of ultrasonic flowmeter

To obtain that

And thus, in the specific calculation,

according to the following

And (6) substituting. From above

The following conclusions can be drawn from the relationship:

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

The measuring range ratio of the flowmeter can be effectively improved

。

(2) The principle of opposite-emitting installation between a pair of transducers: the acoustic signals of the opposite type installation are directly transmitted and received by a pair of transducers, so that the amplitude of the effective signal is the highest. The reflection type has one or more reflection surfaces, so that energy loss is caused by sound wave reflection and transmission (when the reflection surfaces are large enough, the sound energy loss in an ideal state is 10-20%, and generally cannot affect the measurement), and especially when the reflection surfaces have angle deviation or scale is formed after use, the energy loss can reach 40-60%, and the normal measurement is seriously affected. In addition, the existence of the reflecting surface, the installation structure thereof is complicated, and especially, the improper water resistance distribution treatment of the reflecting surface also affects the metering precision.

(3) A consistency principle; the flow channel forming and processing technology of the ultrasonic water meter base meter has higher assembly mounting precision and consistency requirements, and determines the quality of mass production of the flow meters. Especially, the distance between the transmitting surfaces of the two transducers is ensured to be fixed, and the difference caused by the processing of a pipe section and the installation of the transducers is avoided, so that the level is improved, the range of error compensation and precision correction of individual base tables can be reduced, and the complicated workload of manually correcting the errors of the individual base tables at the later stage is reduced;

(4) Tube body sealing safety principle: in the case of a lining pipe, in order to ensure the sealing safety, a mode of local sealing rather than integral sealing is adopted as much as possible so as to ensure the reliability and the durability of the sealing.

(5) The principle of adaptability: the small-caliber flowmeter is convenient for mounting a temperature sensor so as to meet the heat supply metering requirement;

(6) Simple structure, convenient assembly principle: the ultrasonic water meter has a simplified structure and unique certainty, so that the ultrasonic water meter is easy to assemble integrally, is stable and reliable and has higher consistency.

According to the six principles, for a small-caliber ultrasonic water meter, particularly for the DN15 caliber which is the most popular for civil use, the most effective mode is to arrange a mutual radiation type transducer structure in a built-in mode and directly apply integral pipe section processing to manufacture a base meter of the DN15 flow meter.

Better performance (small pick-up flow) is obtained according to the principle of sound path maximization

And large range ratio R), a pair of small-diameter transducers in a correlation mode must be arranged in the pipeline of the DN15 straight pipe under the condition that the straight pipe is not changed, and a larger transducer interval is obtained as far as possible; in addition, considering compatibility with water treatment and water quality conditions in different regions, the diameter of impurities in tap water is less than 3mm according to experience. Corresponding to an ultrasonic flowmeter, a low-water-resistance filter screen needs to be installed at the front end of the meter, and due to the small area, according to the application experience before a common single-flow-speed mechanical meter, the diameter of a mesh needs to reach phi 2.5-3 mm, so that the difficulty in blocking can be ensured. Therefore, it is generally desirable for an all-electronic meter to ensure a minimum water flow through gap of 3mm or more inside the meter base. Therefore, the filter screen only removes foreign matters such as individual hairs and the like, and small-particle impurities pass through the filter screen, so that the filter screen can be used for a long time without blockage. In addition, a series of problems that the flowmeter has a simple and safe system sealing mode and a transducer lead-out wire structure (the lead-out wire cannot be soaked in water) which is convenient to operate and the like need to be solved. ToTo date, there is still a lack of a safe and effective solution to the above-mentioned issues.

In contrast to the above-described criteria, the prior art still has drawbacks or deficiencies.

Patent grant publication No. CN 201503288U provides an ultrasonic direct-transmission flowmeter base table, and it can be seen from the figure that a large transducer (1 MHz transducer, conventional convex front end phi 17 and rear end phi 21) is adopted in the patent, and the transducer is installed and fixed to occupy a large space. The expansion of space volume makes its pipeline have to enlarge, adopts to assemble after segmentation processing and accomplishes, and this kind of structure not only is complicated, installs the labour-consuming, still needs multistage sealed, and the reliability is poor. Because the pipeline is assembled and assembled by nuts in sections, the deformation and deviation of the device can be caused, and the batch consistency of the flowmeter is directly influenced. In addition, the large transducer generates large water resistance in the flow channel, and the flow bypassing of the large transducer can directly influence the accuracy value of flow measurement at different flow speeds. In addition, the sealing of the transducer lead-out wires in the patent is not described in detail.

Another transducer correlation mode is provided by patent publication No. CN 201716054U, in which the transducers protrude from the side of the pipe. The opposite-emitting ultrasonic flowmeter requires that two opposite emitting surfaces of the transducer are strictly parallel, and the single-hole extending mode, the lower unsupported mode for fixing the transducer and the mode that the transducer protrudes to press a lower sealing ring according to the drawing, namely, sealing and positioning are extremely unreliable. The lower part of the transducer is suspended in a water channel, and when the transducer is impacted by strong water flow, the pressure of a sealing surface is uneven and slightly inclined (the compression amount of a sealing ring is regulated and cannot be too tight, so that the sealing ring cannot be used as a positioning surface generally) under the action of lever moment, and the opposite emitting surfaces of the two transducers have the risk of being difficult to keep parallel. Experiments show that for plane waves, the acoustic energy loss caused by the non-parallel of the two transducer surfaces is fatal, and the method also has the problem of the durability of a single sealing ring.

Patent publication No. CN 211317425U proposes a small-caliber correlation straight-through ultrasonic flowmeter, and the stability of the straight-through correlation mode is good. However, the standard tube length of DN15 is specified to be 165mm, if the mode is applied to DN15 caliber, the mode of sealing and leading out wires according to the patent determines that a structure with a larger caliber of a middle tube section is needed to be adopted to arrange the transducer in the opposite mode so as to ensure that the minimum clearance is more than or equal to 3mm. The two ends of the pipe are connected by the change-over head in a mode as described in patent grant publication No. CN 208223575U to reach DN15 specification. The mode of the threaded reducer head has short sound path and low measuring range than R, and the distance between the two transducers is not fully pulled, which is contrary to the sound path maximization principle.

Further analysis is carried out on the patent grant publication No. CN 211317425U, and the ultrasonic water meter (flow meter) consists of a time difference circuit system, a transducer installation mode, a pipeline structure and the like. At present, the time difference circuit system is mainly provided by AMS, D-Flow and TI, and the precision of the time difference circuit system meets the application requirement of the water meter. Therefore, the performance and quality of the water meter are mainly determined by the shape and structure of the transducer, the combination of the transducer and the pipeline, and the installation structure in the pipeline.

For the specification of the core component of the ultrasonic transducer, namely the ceramic oscillator, the water meter committee of the china metering association defines the transducer application standard as follows:

the specified transducer ceramic plate vibration frequency may be: 1MHz, 2MHz and 4MHz are selected,

the ceramic plate has the corresponding common diameter and thickness ratio: phi 12/2mm; phi 8/1mm; phi 8/0.5mm;

the corresponding wavelengths of the material at each frequency are: 2.5mm 1.25mm 0.625mm

(assuming sound velocity of 2500m/s at room temperature for a sound guide material)

Conventionally, the larger the size of the transducer, the greater the intensity of the emitted sound wave, but the larger the installation size; the higher the frequency of the transducer, i.e. the shorter the wavelength, the smaller the physical diameter and volume of the transducer, the more convenient the transducer is to install, the higher the precision of the circuit timing trigger is, and the more accurate the time difference calculation is. Early transducers were low in manufacturing level and had acoustic wave loss in the reflection mode, so most manufacturers adopted 1MHz transducers (using phi 12-14 mm ceramic plates) with large volumes. In recent years, with the improvement of the precision manufacturing level, the electric/sound conversion efficiency of the transducer with small size and high frequency is greatly improved, and the application requirement is completely met. Especially for the ultrasonic small-caliber correlation mode, a transducer mode with small size (phi 8mm ceramic plate) and 2MHz or 4MHz frequency can be selected. Then, the minimum diameter of the transducer size can be phi 10mm by adding the thickness of 1mm required by a packaging plastic shell.

Once the transducer frequency, size, shape of the transducer and its attachment to the pipeline, and its mounting structure in the pipeline, are critical to determining performance.

Patent grant publication No. CN 211317425U is a transducer correlation built-in solution capable of ensuring the maximum distance between two transducers, and can be better applied to DN20 and above calibers. However, in general, for a water meter flowmeter of DN15, if a transducer is built in, the minimum water flow gap at the position of the transducer in the pipe must be ensured to be more than or equal to 3mm so as to ensure that impurities in water can smoothly pass through.

It can be seen from the analysis of the patent that if the device is applied to a water meter with DN15 caliber, namely a built-in transducer is adopted, the transducer, namely the inner tube (integrated) of the flowmeter, is fixed and sealed by a metal pressure ring and a sealing ring which are internally provided with external wires at two ends, and the leading-out wire of the transducer is led out from the middle part of the tube, then the minimum water flow gap can be calculated:

DN15 flowmeter pipe thread external diameter 26.44mm (standard), for processing internal thread, its safe thickness is at least 3.2mm (external thread height is about 1.2mm, internal thread height is 1mm, residual wall thickness is about 1 mm); the minimum diameter phi of the transducer is 10mm (8 mm ceramic resonance piece + single side 1mm protective shell); the thickness of an outer tube of the transducer bracket, which is in contact with and fixed by the metal compression ring with the outer wire, in the tube is at least 2.5mm (a side sealing ring is 1.5-2mm, the smaller diameter phi of a double-strand shielding tape outer sleeve outgoing line of the transducer is 1.5mm, a groove is formed on the outer side of the inner tube, the depth is required to be 1.5mm, and the residual wall thickness of a plastic groove is 1 mm);

then, it can be calculated that the water flow gap where the fluid flows through the pipe at the transducer is:

（26.44mm-2×3.2mm-2×2.5mm-10mm）/2=5.04mm/2=2.52mm≤3mm。

therefore, for the caliber of DN15, the built-in transducer cannot safely pass impurities in water flow in a mode of fixing and sealing by metal press rings at two ends of a pipe, is easy to block, the caliber of a middle pipe is thicker, and the two ends are converted by a DN20-DN15 adapter, namely the mode of the publication number CN 208223575U is adopted. In this case, the distance between the emitting surfaces of the two transducers is about L =63mm, so that the mode has the principle of maximizing the illegal sound path, and the range ratio R of the water meter is greatly reduced.

From the above analysis, the main reason why the scheme of patent authorization publication No. CN 211317425U cannot be directly applied to the DN15 caliber is: the transducers are arranged at two ends of an equal-diameter straight pipe, in order to lead out a signal line and the sealing requirement of the signal line from the middle part of the straight pipe, metal press rings are adopted at two ends of the straight pipe to integrally seal an inner lining pipe at a pipe opening, and the thickness of the outer ring of the inner lining pipe is required to be thickened due to the arrangement of a sealing ring and the routing of the outer ring of the inner lining pipe, so that the water flow gap in the pipe is too narrow; in addition, the mode uses the internal compression rings with the external threads at the two ends of the pipe, so that the assembly is labor-consuming and low in efficiency; due to the existence of the internal thread of the outer pipe, the sealing mode of extruding and installing the sealing rings at the two ends also has potential safety hazards (easy scratching); in addition, the inner liner tube is integrally sealed, and an insertion type temperature sensor is inconvenient to install due to the waterproof requirement; particularly, the inner space between the inner tube and the metal outer tube is narrow, and the outgoing lines of the two transducers in the mode are routed along the outer groove of the inner tube and are led out from the line hole in the middle of the tube (the longer parts of the outgoing lines at the two ends pass through the tube, redundant line ends are arranged, and no placement and operation space is provided), so that the assembly is labor-consuming and time-consuming.

In summary, for the DN15 caliber ultrasonic water meter, the requirements of the above six principles can be met as much as possible, and the scheme of sealing safety and convenient lead-out wire is provided.

Disclosure of Invention

In view of the not enough that prior art exists, this application plans through the fixed mounting mode that changes the sealed mode and the transducer lead-out wire mode of transducer structure, transducer and middle honeycomb duct and outer tubular metal resonator, water gauge totalization circuit box and flowmeter base table, reaches to solve DN15 bore and under the prerequisite that the guarantee has big sound path and has great rivers clearance, reduces whole seal part, makes things convenient for the operation of drawing forth of transducer signal line, accomplishes simple structure, safe and reliable.

It can be seen that, for an ultrasonic water meter with a length of 165mm and a DN15 caliber, if it can be realized as shown in fig. 1, while installing a correlation mode transducer, it is ensured that the minimum water flow gap is not less than 3mm, and the transducers are installed at two ends of a metal tube as much as possible, so that the distance between the emitting surfaces of the transducers can be calculated to be about 113mm, and the distance between the two emitting surfaces is far greater than 63mm when an adapter is provided, and thus (at this time), it can be known that after improvement, the range ratio is improved by 113/63=179.3%, and a qualitative leap is achieved. And the middle part of the flowmeter is properly reduced (on the premise of meeting the pressure loss requirement), so that the measuring range ratio and the flow stability of the DN15 water meter can be further effectively improved, and the start-up flow of the water meter is reduced (the actual test of the scheme can realize the start-up flow of less than 0.4L/h).

The invention provides a centered outgoing line and a sealing structure of a DN15 ultrasonic correlation type water meter, which adopts the technical scheme that: the base meter outer tube of the through correlation type ultrasonic water meter with the DN15 caliber is a through equal-diameter metal outer tube; the transducer is settled at the intraductal both ends head of metal, in order to solve the signal lead-out wire with a pair of correlation formula transducer and draw forth and accomplish minimum water gap >3mm in the runner from the outer metal tube middle part of constant diameter, and do not influence the conventional impurity of aquatic and pass through, so, especially set up a totally enclosed special lead-out wire passageway to transducer signal lead-out wire, cross the line sealed tube through settling the metal, solved in the passageway between transducer structure and the rectifying tube walk the line sealed problem. Therefore, the special-shaped transducer can be installed close to the inner sides of the two ends of the equal-diameter metal outer pipe as much as possible, and stable maximum distance (sound path) between the emitting surfaces of the two transducers is achieved. The connection mode of reducing the conversion head is not needed according to the patent publication No. CN 208223575U. The new layout of the transducer outgoing line and the sealing mode structure obtains substantial effects, and achieves the aim of forming a DN 15-caliber direct correlation type ultrasonic water meter structure with a convenient signal outgoing line in the middle under the coordination of a constant-diameter metal outer pipe as a central framework, a transducer outgoing line fixing seat, a metal wire passing sealing pipe, a transducer outgoing line fixing head, a water meter circuit box, an outgoing line fixing cap and a temperature sensor, thereby realizing the maximization of the measuring range ratio and the minimization of the initial flow value under the condition of ensuring enough water flow clearance in the pipe.

The invention relates to a centering outgoing line and a sealing structure of a DN15 ultrasonic correlation type water meter, which are characterized in that: the constant-diameter energy-saving water meter comprises an equal-diameter metal outer pipe, a special-shaped transducer, a rectifier tube, a lead-out wire channel, a metal wire passing sealing tube, a transducer lead-out wire fixing seat, a transducer lead-out wire fixing head, a water meter circuit box, a lead-out wire fixing cap and a temperature sensor fixing seat; the base meter outer body of the through correlation type ultrasonic water meter with the DN15 caliber is a through equal-diameter metal outer pipe, pipe threads are arranged at two ends of the through correlation type ultrasonic water meter, and the through correlation type ultrasonic water meter is conveniently connected with an outer pipeline; the special-shaped transducer consists of a special-shaped transducer structural part and a transducer flow guide cover, and is glued or welded with the rectifying tube by laser to form a bijection type transducer lining tube integral structure. Through setting up inside lead-out wire passageway, installation metal lead-out wire sealed tube to the whole sealing mode that adopts outer silk metal clamping ring has been changed like patent grant publication No. CN 211317425U at both ends in the metal outer tube, can safely, conveniently draw out transducer signal line from the pipe middle part, make transducer lead-out wire and sealing mode structure have taken place qualitative change. Therefore, the DN15 caliber ultrasonic water meter with the correlation type, the centering wiring and the sealing structure is formed in a new mode, and the maximization of the measuring range ratio and the minimization of the initial flow value are realized.

The special-shaped transducer consists of a special-shaped transducer structural part and a transducer flow guide cover, wherein an ultrasonic transducer ceramic plate assembly is packaged in the middle of the special-shaped transducer structural part; the middle part of the special-shaped transducer structural part is connected with the inner side of the outer ring through an upper support column and a lower support column respectively; a positioning fixing bolt is arranged in the lower support column of the energy converter; the positioning fixing bolt is positioned by the positioning blind hole; go up the support column hole and be the lead-out wire inclined hole, its one end communicates with each other with the transducer middle inside, and the other end communicates with each other with the lead-out wire passageway, and through the lead-out wire passageway, transducer signal lead-out wire can reach to rectifier tube outside center blind hole position, then welds wire (separated time) on built-in PCB. After the devices in the equal-diameter metal outer pipe are installed, the outgoing line is welded on the built-in PCB through the middle hole of the outgoing line fixing seat, and the outgoing of a signal line (bus) of the transducer is achieved.

Because the outgoing line can lead to the central blind hole position in the rectifier tube outside from the rectifier tube line hole through outgoing line inclined hole, lead out the passageway, weld on PCB, draw forth, so dysmorphism transducer structure spare can be close to the both ends inboard installation of constant diameter metal outer tube as far as possible and need not to consider transducer outgoing line fixing base position and other factors. Therefore, the outgoing line mode can maximally increase the distance between the transmitting surfaces of the two transducers, namely, increase the sound path to the maximum value, and obtain the largest range ratio R as possible.

As shown in the attached figure 4, the gap of the part of the special-shaped transducer structural member with the transducer in the middle and the cross section area through which fluid passes are the minimum, so that the middle of the special-shaped transducer structural member is connected with the inner side of the outer ring by an upper support column and a lower support column instead of a plurality of support columns, and the purpose is to reduce blocking, increase the cross section area of water and reduce pressure loss. In addition, the horizontal wire outlet hole of the outgoing line extends the thickness of the upper supporting column and is in butt joint with the necking pipe, so that the area of blocking the water passing inside cannot be increased, and the outgoing line of the transducer signal can be led into the middle blind hole in the outer side of the rectifier tube.

The transducer outgoing line fixing seat is positioned in the middle of the outer side of the equal-diameter metal outer pipe of the flowmeter base meter; the transducer lead-out wire fixing seat is connected with the equal-diameter metal outer pipe through laser welding; the utility model discloses a transducer lead-out wire fixed head, including transducer lead-out wire fixing base, sealing washer and transducer lead-out wire fixing base inboard are sealed to the side, carry out the high location by the locating surface in the lead-out wire fixing base for the height of guarantee lead-out wire fixed head reaches smoothly, and it ensures promptly that lead-out wire fixed head lower part end sealing washer has reasonable compression capacity, can imbed the inside of necking down rectifier tube with the lower part of lead-out wire fixed head again, plays the effect that compresses tightly the location and fix the rectifier tube. Furthermore, a sealing ring below the leading-out wire fixing head is used for sealing the transducer structural part; the side sealing ring is used for sealing the inner side of the leading-out wire fixing seat.

The elastic washer is located above the outgoing line fixing head and below the outgoing line fixing nut, and the outgoing line fixing nut compresses and fixes the outgoing line fixing head of the transducer through force application on the elastic washer.

Between transducer structure spare at rectifier tube and both ends, except the position that the lead-out wire passageway corresponds, all the other butt joint faces are through protruding, concave surface close-fitting connection, can make the part cooperation compact firm. When in butt joint, the metal wire passing sealing pipe and the sealing ring thereof are put at the butt joint part of the outgoing line channel, and then the metal wire passing sealing pipe and the sealing ring are in butt joint. The butt joint is completed by gluing or laser welding (laser welding is widely used for metal and plastic welding at present) at the joint under the assistance of a clamp, so that a stable integral structure of the lining tube of the dual-radiation transducer is formed.

The whole structure of the lining pipe in the dual-correlation type transducer is pressed, positioned and fixed by the leading-out wire fixing head from the middle part of the upper side of the sleeve, and the two positioning fixing bolts are positioned from the position of the lower supporting column of the special-shaped transducer. The fixing bolt is positioned in the lower transducer supporting column. Furthermore, the fixing bolt consists of an outer thread nut, a fixing bolt rod and a spring, and an inner hole of the outer thread nut is hexagonal and is convenient to install. The positioning is completed by clamping the fixing bolt rod into the corresponding blind hole at the inner side of the equal-diameter metal outer tube. And (3) mounting of a fixing bolt: and inserting a fixing bolt component, namely a spring and a fixing bolt rod into a blind hole of a lower support pillar of the special-shaped transducer structural member, and screwing an external screw nut of the fixing bolt to be combined and fixed with the internal thread of the blind hole.

The length of the integral structure of the lining pipe body of the dual-correlation type transducer is less than that of a single side of the equal-diameter metal outer pipe by 0.3mm, and the effect is that when the loose joint of the flowmeter is installed, extrusion force applied to the sealing rubber gasket is mainly borne by the metal pipe opening of the butt joint port, so that the lining pipe can be effectively protected, and the lining pipe is stressed less and cannot deform in long-term use.

The transducer part is formed by packaging a ceramic plate assembly in a blind hole of a structural member of the special-shaped transducer. After the ceramic chip and the PCB are packaged, the outgoing line is welded, and at this time, the transducer signal outgoing line (branch line) is sent into a blind hole in the middle of the rectifier tube through the outgoing line inclined hole and the outgoing line channel without installing a flow guide cover, and is welded on the PCB. The specific operation process of leading the transducer signal wire to the middle part of the rectifier tube is as follows: lead-out wire passageway set up inside the pipe wall of support column and rectifier tube on the transducer structure, a transducer signal line specification: the diameter is 0.08 x 12, the outer diameter is 0.6mm, and the sheath material is PTFE with smooth and hard surface and high temperature resistance. For the welded integral structure of the lining pipe body of the dual-correlation type transducer, two signal leading-out wires (a branch wire, a positive electrode and a negative electrode) penetrate into an inclined hole of the leading-out wire from the middle inside of the transducer, a wire head is led in from a channel port of the leading-out wire by a tool at the opening at the other end of the inclined hole, a wire is pushed in the transducer and sent into a blind hole in the middle of a rectifying tube, and the wire feeding process is very easy to complete due to the fact that the surface of the wire is hard and smooth. As shown in fig. 5, the outgoing line PCB is at the bottom of the blind hole and is in tight fit and butt joint with the edge of the blind hole. The PCB is positioned at the edge of the outlet of the outgoing line channel and is provided with a gap, so that the outgoing line can be conveniently led out to the front side of the PCB for welding. After the leading-out wire is welded, the diversion cover can be buckled, and the process that a signal wire in the lining tube body of the dual-correlation transducer is led out to a blind hole in the middle of the rectifier tube is completed. In order to accomplish IP68 waterproof, with the crew cut tubule, follow lead-out wire inclined hole upper end opening, through the lead-out wire inclined hole, to the inside waterproof solidification of two ingredient A, the gluey water proof of B of pouring into of transducer, notice: the outlet at the upper end of the inclined hole comprising the outgoing line is filled. Therefore, the inside of the special-shaped transducer structural member including the leading-out wire channel opening and the transducer deflector cover are tightly combined into a whole, so that the leading-out wire channel achieves a strong waterproof sealing effect.

The outgoing line channel and the metal wire passing sealing pipe have the following functions: because the connection between the rectifier tube and the transducer structural member at two ends is completed by an adhesive mode or a laser welding mode at a joint, the connection mode can ensure firm and stable connection between the rectifier tube and the transducer structural member, but cannot ensure that the joint inside can be waterproof, so that the metal wire passing sealing tube and the sealing ring on the metal wire passing sealing tube play a role in smoothly communicating a signal leading-out wire from the wire passing inclined hole to a channel of the rectifier tube leading-out wire and the leading-out wire.

The installation sequence of inserting the integral structure of the lining pipe body of the correlation type transducer into the equal-diameter metal outer pipe is as follows: and pressing the fixing bolt rod to retract into the lower support column, and inserting the end of the transducer sleeve into the metal outer tube, wherein the position of the transducer sleeve is required to be staggered with the position of a corresponding blind hole on the inner side of the outer tube. The single-side fixing bolt rod does not need to enter the blind hole, the fixing bolt rod at the other end is pressed, and after the transducer sleeve is completely inserted into the metal outer tube, the two transducer support columns are clamped by a tool, the transducer sleeve is rotated, so that the two fixing bolt rods at the two ends simultaneously enter the respective blind holes, and the installation and the fixation are finished. After the process is completed, as shown in fig. 5, a three-core outgoing line (bus, two signal lines and a common ground line) can be welded on the PCB in the middle of the blind hole of the rectifier tube through the inner hole of the transducer outgoing line mounting base, so as to complete the outgoing of the signal line.

The wall thickness of the equal-diameter metal outer pipe of the flowmeter can meet the technical requirement that impurities pass through smoothly, although the metal outer pipe is slightly thick in the forming mode, the equal-diameter metal outer pipe of the flowmeter has the advantages of being convenient to process and capable of meeting the requirement that the minimum gap in the middle of the special-shaped transducer is larger than 3mm. This is because the pipe both ends of this application need not be with the metal clamping ring that has the outer silk, the transducer lead-out wire does not pass through inside lining shell, so, as shown in figure 2, DN15 bore, choose the equal diameter metal pipe of wall thickness 2.5mm (about 1.2mm of outer silk tooth height) for use, the outer tube of transducer also can not set up the line groove of crossing that can not seal, but set up from inside lead-out wire sealing channel, guide transducer lead-out wire to rectifier tube middle part blind hole exit end, so, except the transducer upper and lower support column, all the other plastics outer tube thickness 1.8mm just satisfy the strength requirement completely. Then, after the structure of the DN15 caliber outer tube is improved, the minimum clearance between the inside of the constant-diameter metal outer tube and the special-shaped transducer can be calculated as follows:

(26.44 mm-2 x 2.5mm-2 x 1.8mm-10 mm)/2 =7.84mm/2=3.92mm >3mm, compared with the patent publication No. CN 208223575U, the material is saved, and the requirement of smooth passing of impurities can be completely met.

For the equal-diameter metal pipe, the inner part of the equal-diameter metal pipe is formed by connecting two transducer structural parts with a reducing rectifier tube to form a lining tube integral structure of a dual-opposite-emission transducer, and the positioning and fixing modes are as follows: the middle part of the upper side of the necking rectifier tube is pressed and fixed by a leading-out wire fixing head; in the lower support column of the transducer structural member at the two ends of the lower side, the two positioning pins are used for positioning and fixing, so that three positioning and fixing positions are formed for the integral structure of the lining pipe body, and the lining pipe body is very firm.

The water meter circuit box is positioned outside the equal-diameter metal outer pipe of the flowmeter base meter and consists of a lower meter circuit box shell and an upper meter circuit box shell. The totalizing circuit board, the instrument display screen and the battery are positioned in the instrument circuit box. The instrument circuit box lower casing is cylindric cooperation with transducer lead-out wire fixing base outer lane, has the sealing washer to seal between the two. As shown in fig. 5, particularly, the outer ring of the fixed seat of the outgoing line of the transducer is further provided with a symmetrical positioning column structure which is matched with the lower shell of the instrument circuit box, so that the outer ring can not rotate and is very firm. The symmetrical positioning column structures are positioned on two sides of the outer ring of the outgoing line fixing seat and are used for fixing the lower shell of the instrument circuit box to prevent the lower shell from rotating, so that the display direction of the instrument display screen can be adjusted.

The lead-out wire fixing nut has two functions: the fixing head of the leading-out wire of the transducer is pressed tightly by applying force to the elastic washer; and the other function is to press the lower shell of the circuit instrument box, thus, the bottom shell of the circuit instrument box is fixed by a very simple method, and fixing devices are saved. According to actual demand, can make it reach IP68 protection level to waterproof glue of embedment in the circuit instrument circuit box.

In the present invention, if the thermal energy carried by the fluid is to be metered, a temperature sensor is required. Because the whole sleeve pipe of inside lining that dysmorphism transducer and rectifying tube constitute need not waterproof sealing with the metal outer tube inboardly, so, when carrying out the heat measurement application, the metal outer tube outer end is close to water outlet department and can laser welding settle temperature sensor mount pad, temperature sensor can conveniently install in the temperature sensor mount pad, as shown in figure 6, the temperature sensor temperature measurement pole is inserted in the transducer water conservancy diversion lid outside in the exit to one side, does not influence the measurement to the fluid.

In summary, compared with the prior art, the invention has outstanding substantial improvement and significant progress, which are specifically shown as follows:

firstly, for a DN15 caliber or small-caliber ultrasonic flowmeter base meter with a given length, the invention is easy to lead out a transducer signal line from the middle part of the flowmeter by arranging a waterproof sealing channel structure of a signal lead-out wire of a built-in special-shaped transducer, so that two built-in special-shaped transducer structural parts can be arranged close to two ends of the inner side of an equal-diameter metal straight pipe as far as possible without direct pipeline of the flowmeter, the diameter is reduced and connected by adopting a large-variable small connector conversion thread mode, the minimum water flow gap in the DN15 caliber straight pipe is ensured to be larger than 3mm, and the safe passing of impurities in water is facilitated. The distance between the transmitting surfaces of the two transducers is maximized, namely, the sound path is maximized, and therefore, the range ratio and the start-up flow of the DN 15-caliber or small-caliber ultrasonic flowmeter are maximized.

The second has set up a lead-out wire passageway from support column to rectifier tube outside pipe wall middle part blind hole on the special-shaped transducer structure, and this passageway can lead to the signal line from the transducer inside through lead-out wire inclined hole, lead-out wire passageway to the rectifier tube middle part blind hole, therefore, accomplished to draw forth the bus and can follow the outside welding in metal tube middle part very easily, draw forth.

The beneficial effects that it reaches are: the special-shaped transducer structural part is installed without considering the influence on the sealing of the signal outgoing line, and can be installed close to the inner sides of the two ends of the equal-diameter metal outer pipe as much as possible. Therefore, the inner sides of the two ends of the equal-diameter metal outer pipe do not need compression rings, the distance between the transmitting surfaces of the two transducers can be further increased, namely, the sound path is increased, and the range ratio R is improved.

Thirdly, because the gap of the part of the special-shaped transducer structural part with the transducer, namely the cross section area through which the fluid passes, is the smallest, the middle part of the special-shaped transducer structural part is connected with the inner side of the outer ring by an upper support column and a lower support column instead of a plurality of support columns, and the aims of reducing blocking, increasing the cross section area of water passing and reducing pressure loss are fulfilled. In addition, the horizontal wire outlet hole of the leading-out wire extends the wall thickness of the upper supporting column to be in butt joint with the rectifying tube, so that the area for blocking the water passing inside cannot be increased, and the transducer signal leading-out wire can be led into the blind hole in the middle of the outer side of the reducing tube.

Fourthly, the outgoing line channel and the metal wire passing sealing tube have the following functions: because being connected between rectifier tube and the transducer structure at both ends, be through gluing mode or accomplish with the laser welding mode at seam crossing, firm, the stable connection between the two can be guaranteed to this kind of connected mode, but can not guarantee that inside seam crossing can be waterproof, cross the sealing washer on the wire sealed tube and just play butt joint between rectifier tube and the transducer structure through the installation metal, play sealed waterproof effect to the lead-out wire passageway, so through the protection after the encapsulating to the lead-out wire inclined hole, can be safely with signal lead-out wire from crossing the wire inclined hole and draw forth in the rectifier tube middle part blind hole.

Fifthly, the centered outgoing line and the sealing structure of the DN15 ultrasonic correlation water meter only partially seal the liner tube in the whole body, and do not adopt the mode of integrally sealing the liner tube, thereby effectively ensuring that the minimum water flow gap in the tube is more than 3mm, and being beneficial to the safe passing of impurities. On the premise of reducing the use of accessories, the transducer signal lead-out wire can be conveniently led out through a special channel of the transducer signal lead-out wire and finally sent to a flow meter integrating circuit board.

Sixthly, the fixing head of the outgoing line of the transducer is subjected to height positioning through the positioning surface in the outgoing line fixing seat, so that a sealing ring at the lower end of the outgoing line fixing head is guaranteed to have reasonable compression amount, and the lower part of the outgoing line fixing head can be embedded into a special-shaped transducer structural member to play a role in compressing, positioning and fixing the special-shaped transducer structural member.

Seventh, the lead-out wire fixing nut of the present invention realizes the first-generation-second function by compressing the transducer lead-out wire fixing head by applying force to the elastic washer; meanwhile, the other function is to press and fix the lower shell of the circuit instrument box, so that lower shell fixing devices are reduced.

Eighth, the connection between the rectifying tube and the transducer structural members at the two ends of the rectifying tube is completed by gluing or laser welding at the joint with the aid of a clamp, so that an integral structure of a lining tube body of a dual-emission transducer is formed, and one purpose of the structure is to ensure that the distance between the emitting surfaces of the two transducers is highly consistent during mass production and can be kept constant during assembly or use of the flowmeter. The distance between the transmitting surfaces of the transducers determines the range ratio, so that the consistency of the parameters of the flowmeter is ensured, and the detection and calibration of the flowmeter are greatly facilitated.

Ninth, the inside of the equal-diameter metal tube is connected with a reducing rectifier tube by two transducer structural parts to form a whole structure of a lining tube of a dual-correlation transducer, and the positioning and fixing modes are as follows: the middle part of the upper side of the necking rectifier tube is pressed and fixed by a leading-out wire fixing head; in the lower support column of the transducer structural member at the two ends of the lower side, the two positioning pins are used for positioning and fixing, so that three positioning and fixing positions are formed for the integral structure of the lining pipe body, and the lining pipe body is very firm.

Tenth, the length of the whole structure of the lining pipe body of the dual-correlation type transducer is 0.3mm less than that of the single side of the equal-diameter metal outer pipe, and the length of the whole structure is 0.3mm less than that of the single side of the equal-diameter metal outer pipe.

Eleventh, according to the centered outgoing line and the sealing structure of the DN15 ultrasonic correlation water meter, the sealing structure in the straight pipe is convenient for welding the temperature sensor fixing seat by laser at the outer end of the water outlet of the outer metal pipe, and installing the temperature sensor, so that heat energy metering is facilitated.

This application provides and installs special-shaped transducer and middle part lead-out wire passageway and seal structure in external diameter metal straight tube such as waiting, through the compressing tightly location of lead-out wire fixed head to the rectifier tube, fixed and the metal of lead-out wire is crossed the line sealed tube, special-shaped transducer becomes integrative with the sticky or laser welding of undergauge rectifier tube, the connection structure of totalizing circuit box inferior valve and flowmeter base table, be through the theoretical and engineering research summary of many years and put forward to it is effective through practice verification, novelty, creativity and practicality.

Drawings

FIG. 1 is a sectional view of a centered outgoing line and a sealing structure of a DN15 ultrasonic correlation water meter;

fig. 2 is a partial cross-sectional view of a centered outlet and seal structure of a DN15 ultrasonic correlation water meter;

fig. 3 is a side sectional view of a DN15 caliber correlation ultrasonic water meter outlet structure;

fig. 4 is a side view of a DN15 caliber correlation ultrasonic water meter;

FIG. 5 is a schematic diagram of a DN15 correlation type ultrasonic water meter signal line middle leading-out hole and meter case positioning structure;

fig. 6 is a schematic view of a mounting structure of a DN15 caliber correlation ultrasonic water meter temperature sensor;

in the figure:

11. an equal-diameter metal outer pipe; 111. an external thread; 12. the transducer leading-out wire fixing seat; 121. a seal ring; 122. positioning the surface; 123. a positioning column; 14, fixing a leading-out wire of the transducer; 141. a lower seal ring; 142. a side seal ring; 13. a mesoporous PCB;131.PCB positive pad; 132.pcb ground pad; 15. an elastic washer; 16. a lead-out wire fixing cap; 25. a ceramic sheet assembly; 22. a profiled transducer structure; 221. an upper support column; 222. a lower support column; 223. an outgoing inclined hole; 23. a transducer deflector cap; 231. a lower groove of the diversion cover; 26, fixing bolts; 262. a fixed bolt rod; 261. an external thread nut; 263. a spring; 112. blind holes; 224. installing a transducer assembly blind hole; 225. the unilateral length difference between the inner lining pipe and the outer pipe; 33. a rectifier tube; 331. a seal ring; 332. an outgoing line channel; 334. welding a seam by laser; 333. a blind hole in the middle; 44. a wire-passing sealing tube; 441. sealing ring 55, instrument circuit box; 55A, a lower shell of the instrument circuit box; 55B, an upper shell of the instrument circuit box; 551. a circuit PCB;552. a display screen; 553. a battery; 18. transducer signal lines (splits, bus); 17. a temperature sensor fixing seat; 171. a temperature sensor;

Detailed Description

Example (b):

the invention is described in further detail below with reference to the figures and examples.

As shown in fig. 1, the present embodiment is a centered outgoing line and a sealing structure of a DN15 ultrasonic correlation type hot water meter, and its technical application scheme is: the straight pipe of the ultrasonic flowmeter is an equal-diameter stainless steel 304 metal outer pipe 11 with the thickness of 2.5mm, and is connected with a transducer outgoing line fixing seat 12 and a temperature sensor fixing seat 17 on the outer side of the straight pipe through laser welding; two ends in the through pipe are respectively provided with a special-shaped transducer which consists of a special-shaped transducer structural part 22 and a transducer flow guide cover 23, and the two transducer structural parts 22 and a rectifying pipe 33 in the middle of the two transducer structural parts are connected through gluing or laser welding to form a dual-correlation type transducer lining integral structure. Different from the patent publication No. CN 211317425U, in order to lead out the signal lead-out wires of two transducers from the middle of the equal-diameter metal outer tube, a lead-out wire channel 332 is specially provided, and in this special channel, a metal wire-passing sealing tube 44 is further arranged, so as to solve the problem of wire sealing between the transducer structural member 22 and the necking down rectifier tube 33, and this lead-out wire channel 44 does not need to seal the liner tube in the whole body, and there is only a partial seal between this whole liner structure and the inner side of the equal-diameter metal straight tube 11, this improvement provides a possibility for enlarging the minimum water gap in the tube. Therefore, the substantive change can achieve the minimum water passing gap in the flow channel of more than 3mm for the most common household DN15 caliber under the given length of the straight through pipe of the ultrasonic water meter, and can avoid the DN15 caliber from adopting a complicated conversion joint with large diameter and small diameter, thereby not only realizing the stable maximum distance (sound path) between the transmitting surfaces of the two transducers, namely improving the range ratio R, but also being convenient for assembly and leading out the signal wires of the transducers.

The equal-diameter stainless steel 304 metal outer pipe 11 with the thickness of 2.5mm is provided with pipe threads 111 on the outer sides of two ends, and is conveniently connected with an external pipeline. And the transducer leading-out wire fixing seat 12 and the temperature sensor fixing seat 17 are connected to the outer side of the equal-diameter metal outer pipe through laser welding.

The special-shaped transducer consists of a special-shaped transducer structural part 22 and a transducer flow guide cover 23, and a transducer ceramic plate component 25 is sealed in a blind hole 224 in the middle of the special-shaped transducer structural part; the middle part of the special-shaped transducer structural part is connected with the inner side of the outer ring through an upper support column 221 and a lower support column 222 respectively; a positioning fixing bolt 26 is arranged in the transducer lower support column 222; the positioning fixing bolt is positioned by the positioning blind hole 112; the inner hole of the upper support column is an outgoing line inclined hole 223, one end of the upper support column is communicated with the inside of the transducer, the other end of the upper support column is communicated with an outgoing line channel 332, a signal outgoing line (branching line) of the transducer is communicated to the position of a central blind hole 333 on the outer side of the rectifier tube through the outgoing line channel 332, and then a lead is welded on the built-in PCB 13. After the integral lining sleeve of the transducer is installed in the equal-diameter metal outer tube, the outgoing line is welded on the built-in PCB13 at the blind hole 333 through the middle hole of the outgoing line fixing seat, and the process that the signal line 18 (bus) of the transducer is led out to the integrating circuit board 551 is achieved.

Since the lead wire can be welded and led out from the rectifying tube wire hole to the PCB13 in the rectifying tube outer side center blind hole 333 through the lead wire inclined hole 223 and the lead wire passage 332, the special-shaped transducer structural member 22 can be installed as close to the inner sides of the two ends of the equal-diameter metal outer tube 11 as possible without considering the position of the transducer lead wire fixing seat 12 and other factors. Therefore, the lead-out wire mode can maximally increase the distance between the transmitting surfaces of the two transducers, namely, the sound path is increased to the maximum value, and the largest possible range ratio R is obtained.

As shown in FIG. 4, since the water flow gap and the cross-sectional area of the fluid passing through the part of the transducer in the middle of the special-shaped transducer structural member 22 are the smallest, the middle of the special-shaped transducer structural member 22 and the inner side of the outer ring are connected by the upper 221 supporting column and the lower 222 supporting column instead of a plurality of supporting columns, so as to reduce the blocking, increase the cross-sectional area of water passing and reduce the pressure loss. In addition, the horizontal wire outlet hole 332 of the outgoing line extends the thickness of the upper supporting column to be in butt joint with the rectifying tube, so that the internal water blocking area cannot be increased, and the outgoing line of the transducer signal can be communicated into a blind hole in the middle of the outer side of the reducing tube.

The transducer outgoing line fixing seat 12 is positioned in the middle of the outer side of the equal-diameter metal outer pipe 11 of the flowmeter base meter; the transducer lead-out wire fixing seat 12 is connected with the equal-diameter metal outer pipe 11 through laser welding; the transducer lead-out wire fixed head 14 is located the inside lower extreme of transducer lead-out wire fixing base 12, and the side has sealing washer 142 and the inboard sealing of transducer lead-out wire fixing base 12, carries out the altitude localization by locating surface 122 in the lead-out wire fixing base for ensure the height and the level and smooth of lead-out wire fixed head 14, it ensures that 14 lower part end sealing washers 141 of lead-out wire fixed head have reasonable compressibility promptly, can imbed the inside of rectifier 33 with the lower part of lead-out wire fixed head again, plays the effect that compresses tightly the location and fix the rectifier. That is, further, a seal ring 141 below the lead wire fixing head 14 is used for sealing the rectifying pipe 33; the side seal ring 142 is used for sealing the inside of the lead wire fixing base 12.

The elastic washer 15 is located above the lead wire fixing head 14 and below the lead wire fixing nut 16, and the lead wire fixing nut 16 presses and fixes the transducer lead wire fixing head 14 by applying force to the elastic washer 15.

Except the positions corresponding to the outgoing line channels, the rest butt joint surfaces between the rectifier tube 33 and the transducer structural members 22 at the two ends are in tight fit connection through the convex surface 334 and the concave surface 334, so that the components can be compactly and stably matched. In order to waterproof and seal the outgoing line between the two, the metal wire-passing sealing tube 44 and the sealing ring 441 are put into the butt joint position of the outgoing line channel, and then the two are closed and butted. At the butt joint 334, the process is completed by gluing or laser welding (laser welding is widely used for metal and plastic welding at present) to form a stable integral structure of the lining tube body of the dual-radiation transducer.

For the equal-diameter metal tube 11, the two transducer structural members 22 and the reducing rectifier 33 are connected to form a double-opposed-jet transducer lining tube integral structure, and the positioning and fixing modes are as follows: the middle blind hole 333 outside the necking rectifier tube is tightly pressed, positioned and fixed on the rectifier tube through the outgoing line fixing head 14; the two ends of the lower side are positioned and fixed by two fixing bolts 26 in the lower support column 222 of the transducer structural member; therefore, the integral structure of the lining pipe body forms three positioning and fixing positions in the equal-diameter metal outer pipe 11, and is very firm.

The fixing bolt 26 is located in the transducer lower supporting column 222, further, the fixing bolt 26 is composed of an outer thread nut 261, a fixing bolt rod 262 and a spring 263, and an inner hole of the outer thread nut 261 is a hexagonal hole, so that the mounting is convenient. The positioning is completed by the fixing bolt 262 being clamped into the corresponding blind hole 112 on the inner side of the equal-diameter metal outer tube. Installation of the fixing pin 26: and inserting the fixing bolt assembly, namely the spring 263 and the fixing bolt rod 262 into a blind hole of a lower support pillar of the special-shaped transducer structural member, and screwing the fixing bolt external screw nut 261 to be combined and fixed with the internal thread of the blind hole.

The length 225 of the whole structure of the double-correlation type transducer inner lining pipe is 0.3mm less than that of a single side of the equal-diameter metal outer pipe 11, and the double-correlation type transducer inner lining pipe has the function that when the loose joint of the flowmeter is installed, extrusion force applied to the sealing rubber gasket is mainly received by the metal pipe opening of the butt joint port, so that the inner lining pipe can be effectively protected, and the inner lining pipe is stressed less and cannot deform in long-term use.

The transducer part is completed by packaging a ceramic sheet assembly 25 in a blind hole 224 of a special-shaped transducer structural member and welding a leading-out wire; at this time, the transducer signal lead-out wire 18 (branch wire) is sent to the inner part of the dead hole 333 of the rectifying tube through the lead-out wire inclined hole 223 and the lead-out wire channel 332 without installing the deflector cover 23, and the lead wire is welded on the PCB 13. The specific operation process of leading the transducer signal wire to the middle 333 of the rectifier tube is as follows: lead-out wire passageway set up inside the pipe wall of support column 221 and rectifying tube on the transducer structure, a transducer signal line specification: the diameter is 0.08 x 12, the outer diameter is 0.6mm, and the sheath material is PTFE with smooth and hard surface and high temperature resistant lines. For the welded integral structure of the lining tube body of the dual-correlation type transducer, two signal leading-out wires 18 (branch wires) penetrate into a leading-out wire inclined hole 223 from the middle inside of the transducer, a wire head is led in from a leading-out wire channel 332 port by a tool at the opening at the other end of the inclined hole 223, a wire is pushed in the transducer, and the wire is sent into a blind hole 333 in the middle of the rectifying tube. As shown in fig. 5, the PCB13 is mounted at the bottom of the blind hole 333 and is tightly fitted and connected with the side surface. The edge of the PCB13 is positioned at the position of the outgoing line channel 332, and the PCB13 is provided with a corresponding notch, so that the outgoing line can be conveniently led out to the front side of the PCB13 to complete welding. This wire feeding process is easily accomplished due to the hard and smooth surface of the wire. The diversion cover 23 can be buckled on the tube body, and the process of leading out the signal wire in the tube body of the double-shot transducer lining to the blind hole 333 in the middle of the rectifying tube is completed. In order to realize IP68 water prevention, a flat-head thin tube is used, the upper end of the outgoing line inclined hole 223 is opened, and two-component glue A and B waterproof curing glue is injected into the transducer through the outgoing line inclined hole 223. Particularly, the inside of the special-shaped transducer structural member 22 including the outlet at the upper end of the outgoing line inclined hole 223 and the inlet of the outgoing line channel 332 and the groove 231 at the lower end of the transducer flow guiding cover 23 are tightly combined into a whole, so that the outgoing line channel achieves a strong waterproof sealing effect.

The outgoing line channel 332 and the metal wire passing sealing tube 44 have the following functions: because the connection between the rectifier tube 33 and the transducer structural member 22 at the two ends is completed by an adhesive method or a laser welding method at the joint, the connection method can ensure that the rectifier tube and the transducer structural member are firmly and stably connected, but cannot ensure that the inner joint can be waterproof, the metal wire passing sealing tube 44 and the sealing ring 441 thereon play a role in sealing and smoothly penetrating the signal outgoing line from the wire passing inclined hole 223 to the rectifier tube outgoing line channel 332.

The whole structure of the lining pipe of the correlation transducer is inserted into the equal-diameter metal outer pipe 11 in the following installation sequence: hold down fixing bolt 262, make it retract in lower prop 222, insert inside the metal outer tube 11 this end of transducer overall structure sleeve pipe, notice, the blind hole 112 position that will correspond with the outer tube inboard staggers, do not let unilateral fixing bolt 262 to bounce into the blind hole 112 earlier, wait to hold down other one end fixing bolt 262, and with the whole back of inserting the transducer sleeve pipe in the metal outer tube 11, with the instrument, block two transducer support columns, the rotary transducer sleeve pipe, make two fixing bolt 262 at both ends get into respective blind hole 112 simultaneously, blind hole 333 aims at lead-out wire fixing base 12 hole in the middle of the rectifying tube, accomplish the installation fixed.

Leading out of the transducer leading-out bus: after the above process is completed, three outgoing lines, i.e. two signal lines 131 and a common ground line 132, are welded on the PCB13 in the middle of the blind hole of the rectifier tube through the middle hole of the transducer outgoing line mounting base 12 as shown in fig. 5, so as to complete the outgoing of the signal line 18 (bus).

To DN15 bore water gauge base table, the wall thickness 2.5mm of flowmeter isodiametric metal outer tube 11 can satisfy directly turning out 1.2mm pipe screw interface at outer outside both ends of tube, though this kind of forming method metal outer tube is slightly thick, but the advantage is processing convenience, can satisfy the minimum clearance in the special-shaped transducer >3mm, the technical requirement that impurity can pass through smoothly promptly. The reason is that the two ends in the tube do not need to be sealed by metal press rings with external wires, the outgoing line of the transducer does not pass through a slot of the lining shell, so as shown in figure 2, DN15 caliber adopts an equal-diameter metal tube with the wall thickness of 2.5mm (the tooth height of the external wire is about 1.2 mm), the outer tube of the transducer can not be provided with a line passing slot which cannot be sealed, but the outgoing line of the transducer is guided to the outlet end of a blind hole in the middle of the rectifying tube from the sealing channel of the internal outgoing line, and the thickness of the rest outer tubes is 1.8mm except for the upper support column and the lower support column of the transducer, so that the strength requirement can be completely met. Then, after the structure of the DN15 caliber outer tube is improved, the minimum water flow gap between the inside of the constant-diameter metal outer tube and the middle of the special-shaped transducer can be calculated as follows:

The water meter circuit box 55 is located outside the equal-diameter metal outer pipe 11 of the base meter of the flow meter and is composed of a lower meter circuit box shell 55A and an upper meter circuit box shell 55B. The integrating circuit board 551, meter display 552 and battery 553 are located within the meter circuitry box 55. The lower shell 55A of the instrument circuit box is tightly matched with the outer ring of the outgoing line fixing seat 12 of the transducer in a cylindrical shape. As shown in fig. 5, in particular, the outer ring of the fixing seat 12 for leading out wires of the transducer is further provided with symmetrical positioning column structures 123 which are matched with the lower casing 55A of the instrument circuit box, so that the instrument circuit box cannot rotate and is very firm. The symmetrical positioning column structures 123 are located on two sides of the outer ring of the outgoing line fixing seat 12, and are used for fixing the lower casing 55A of the instrument circuit box to prevent the lower casing from rotating, so that the display direction of the instrument display screen 552 can be adjusted.

The lead wire fixing nut 16 has two functions: firstly, the transducer lead-out wire fixing head 14 is pressed tightly by applying force to an elastic gasket 15; and the other function is used for pressing the lower shell 55A of the circuit instrument box, so that the positioning and fixing of the bottom shell 55A of the circuit instrument box are completed by using a very simple method, and fixing devices are saved. According to actual requirements, waterproof glue can be filled and sealed in the circuit box 55 of the circuit instrument, so that the protection level of the circuit instrument reaches IP 68.

For this embodiment, the flow rate of hot water and the heat energy carried by the fluid need to be measured, so that a temperature sensor 171 needs to be installed in addition to the flow rate measurement. Because the whole sleeve pipe of inside lining that dysmorphism transducer 22 and rectifying tube 33 constitute need not waterproof sealing with metal outer tube 11 inboardly, so, carry out temperature measurement, when inserting temperature sensor 171 in temperature sensor fixing base 17, because the outer end of metal outer tube is close to water outlet department, can conveniently place temperature sensor in the delivery port water conservancy diversion lid 23 outside, the temperature sensor temperature measurement pole can not influence the measurement to the rivers fluid.

The embodiment of the invention has been described for the application of the centered outgoing line and the sealing structure of the DN15 ultrasonic correlation water meter in hot water energy metering, but the invention is not limited to the above specific embodiment, and any modification or variation based on the content of the invention falls within the scope of the invention claimed.

Claims

1. The utility model provides a DN15 ultrasonic wave correlation formula water gauge lead-out wire and seal structure placed in middle which characterized in that: the temperature sensor comprises an equal-diameter metal outer pipe (11), a special-shaped transducer, a rectifier tube (33), an outgoing line channel (332), a metal wire passing sealing pipe (44), a transducer outgoing line fixing seat (12), a transducer outgoing line fixing head (14), a water meter instrument circuit box (55), an outgoing line fixing cap (16) and a temperature sensor fixing seat (17); the DN15 caliber correlation ultrasonic water meter has the advantages that the outer tube body of the base meter is a straight-through equal-diameter metal outer tube (11); in order to solve the problems that signal leading-out wires of a pair of correlation transducers are arranged in the middle of an equal-diameter metal outer pipe, the minimum water passing gap in a flow channel is larger than 3mm, and impurities in water cannot be influenced, a fully-sealed special leading-out wire channel (332) is arranged; by arranging the metal wire passing sealing tube (44) in the metal wire passing sealing tube, the sealing problem of the central wiring between the special-shaped transducer structural part (22) and the rectifying tube (33) is solved, so that the special-shaped transducer is arranged close to the inner sides of two ends of the equal-diameter metal outer tube (11), and the stable maximum distance (sound path) between the emitting surfaces of the two transducers is realized; the centered routing and sealing structure of the transducer outgoing line achieves the purpose of using an equal-diameter metal outer pipe (11) as a central framework, and under the layout and cooperation of a transducer outgoing line fixing seat (12), a metal wire passing sealing pipe (44), a transducer outgoing line fixing head (14), a water meter instrument circuit box (55), an outgoing line fixing cap (16) and a temperature sensor seat (17), the centered outgoing line and the sealing structure of the DN15 ultrasonic correlation water meter are formed, so that the maximization of a measuring range ratio and the minimization of an initial flow value are realized under the condition that enough water flow gaps exist in a protective pipe.

2. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the outer sides of two ends of the equal-diameter metal outer pipe (11) are provided with pipe threads 111, so that the equal-diameter metal outer pipe is conveniently connected with an external pipeline; and a transducer leading-out wire fixing seat (12) and a temperature sensor fixing seat (17) which are connected to the outer side of the equal-diameter metal outer pipe through laser welding.

3. The centering outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the transducer ceramic chip assembly (25) is arranged in a blind hole (224) in the middle of a special-shaped transducer structural member and comprises a ceramic chip which is bonded with the bottom of the blind hole through double-component glue A and double-component glue B, the anode and the cathode of the ceramic chip are welded on a PCB, and a leading-out wire is also welded on the PCB.

4. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the routing layout of the transducer signal outgoing line (18, branching line and bus) is as follows: a transducer signal leading-out wire (18) is branched from the inside (224) of the special-shaped transducer, passes through a leading-out wire inclined hole (223), a metal wire passing sealing tube (44) and a leading-out wire channel (332), reaches the PCB (13) in a central blind hole (333) on the outer side of the rectifying tube, and is welded with the PCB (13); after an integral sleeve composed of the special-shaped transducer and the rectifying tube is arranged in the equal-diameter metal tube, a signal (18 bus) can be welded and led out to the integrating circuit board (551) through the PCB (13) of a central blind hole (333) of the rectifying tube in a middle hole of a transducer leading-out wire fixing seat (12) in the middle of the equal-diameter metal tube (11); for the special-shaped transducer structural member (22), the special-shaped transducer structural member is installed close to the inner sides of the two ends of the equal-diameter metal outer pipe (11) as far as possible without considering the position of the transducer lead-out wire fixing seat (12) and other factors, and the lead-out wire mode can furthest increase the distance between the transmitting surfaces of the two transducers, namely increase the sound path to reach the maximum value and obtain the range ratio R as far as possible.

5. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the transducer leading-out wire fixing head (14) is positioned at the lower end inside the transducer leading-out wire fixing seat (12), a sealing ring (142) is arranged on the side surface of the transducer leading-out wire fixing head and is sealed with the inner side of the transducer leading-out wire fixing seat (12), and the height positioning is carried out by a positioning surface (122) in the leading-out wire fixing seat so as to ensure the height and the flatness of the leading-out wire fixing head (14), so that the reasonable compression amount of the sealing ring (141) at the lower end of the leading-out wire fixing head (14) is ensured, the lower part of the leading-out wire fixing head can be embedded into the rectifier tube (33), and the functions of compressing, positioning and fixing the rectifier tube are achieved; furthermore, a sealing ring (141) below the leading-out wire fixing head (14) is used for sealing the transducer structural part (22); the side sealing ring (142) is used for sealing the inner side of the leading-out wire fixing seat (12).

6. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the middle part of the special-shaped transducer structural part (22) is connected with the inner side of the outer ring only by an upper support column (221) and a lower support column (222) so as to reduce the blocking of the transducer part to water flow, increase the cross-sectional area of water and reduce the pressure loss formed by water resistance.

7. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the rectifying tube (33) and the transducer structural parts (22) at the two ends are tightly connected with each other through the convex and concave surfaces (334) except the corresponding positions of the outgoing line channels, so that the components can be compactly and stably matched; when in butt joint, in order to prevent the outgoing line from being water and seal the outgoing line, a metal wire passing sealing tube (44) and a sealing ring (441) thereof are put at the butt joint position of the outgoing line channel, and then the metal wire passing sealing tube and the sealing ring are closed and butt jointed; at the butt joint (334), the welding is finished by an adhesive mode or a laser welding mode (laser welding is widely used for metal and plastic welding at present) at the joint, and a stable integral structure of the lining tube body of the dual-radiation transducer is formed.

8. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the specific operation process that transducer signal line leads to rectifier tube middle part does: the leading-out wire passageway sets up inside the pipe wall of support post (221) and rectifying tube (33) on the transducer structure, a transducer signal line specification: the diameter is 0.08 x 12, the outer diameter is 0.6mm, and the sheath material is a high-temperature resistant wire with a smooth PTFE surface; for the welded integral structure of the lining pipe body of the dual-correlation type transducer, two signal leading-out wires (18) are branched and penetrate into a leading-out wire inclined hole (223) from the middle inside of the transducer, at the opening at the other end of the inclined hole, a wire head is led in from a leading-out wire channel (332) port by a tool, a lead is pushed in the transducer, and the lead is sent into a blind hole (333) in the middle of a rectifier tube; as shown in fig. 5, the PCB (13) is mounted at the bottom of the blind hole (333) and is tightly fitted and connected with the side surface; the PCB (13) is positioned at the position of the outlet passage (332), the PCB (13) is provided with a corresponding notch, so that the outlet wire (18) is led out to the front surface of the PCB (13) to complete welding, and the wire feeding process is easy to complete due to the hard and smooth surface of the wire; then, a diversion cover (23) can be buckled, and the process of leading out the signal wire to a blind hole (333) in the middle of the rectifier tube in the lining tube body of the dual-emission transducer is completed; in order to realize IP68 waterproofing, a flat-head thin tube is used, an opening is formed in the upper end of an outgoing line inclined hole (223), and two-component glue A and B waterproof curing glue is injected into the transducer through the outgoing line inclined hole (223); therefore, the interior of the special-shaped transducer structural part (22) including the outlet at the upper end of the outgoing line inclined hole (223) and the inlet of the outgoing line channel (332) is tightly combined with the groove (231) at the lower end of the transducer flow guide cover (23) into a whole, so that the outgoing line channel achieves a strong waterproof sealing effect.

9. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: for the equal-diameter metal pipe (11), the inner part of the equal-diameter metal pipe is connected by two transducer structural parts (22) and a reducing rectifier tube (33) to form a lining pipe integral structure of a dual-radiation transducer, and the positioning and fixing modes are as follows: the middle blind hole (333) at the outer side of the necking rectifier tube is tightly pressed, positioned and fixed on the rectifying tube through a leading-out wire fixing head (14); the two ends of the lower side are positioned and fixed in a lower support column (222) of the transducer structural member by two positioning pins (26) which penetrate into the blind holes (112); therefore, three positioning and fixing positions are formed at two ends of the integral structure of the lining pipe body in the equal-diameter metal outer pipe (11), and the integral structure is very firm.

10. The centering outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the fixing bolt (26) is positioned in the lower support column (222) of the transducer structural part (22), further, the fixing bolt (26) consists of an external thread nut (261), a fixing bolt rod (262) and a spring (263), and the fixing bolt (262) is screwed into the lower support column (222) for fixing by the external thread nut (262) with a hexagonal inner hole; the fixed bolt rod (262) is clamped into a blind hole (112) corresponding to the inner side of the equal-diameter metal outer pipe (11) to complete positioning; mounting of the fixing bolt (26): and inserting a fixing bolt assembly, namely a spring (263) and a fixing bolt rod (262) into a blind hole of a lower support column (222) of the special-shaped transducer structural member, and screwing an outer screw nut (261) of the fixing bolt to be combined and fixed with the inner thread of the blind hole.

11. The centering outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the length (225) of the integral structure of the lining pipe body of the dual-correlation type transducer is 0.3mm less than that of the single side of the length of the equal-diameter metal outer pipe (11), and the effect is that when the loose joint of the flowmeter is installed, extrusion force borne by the sealing rubber gasket is mainly borne by the metal pipe opening of the butt joint port, so that the lining pipe can be effectively protected, and the lining pipe is stressed less and cannot deform in long-term use.

12. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the integral structure of the lining pipe body of the correlation type transducer is inserted into the equal-diameter metal outer pipe (11) for installation: pressing the fixed bolt rod (262) to retract the head of the fixed bolt rod, and inserting one end of the transducer sleeve into the metal outer tube (11); note that the positions of the blind holes (112) corresponding to the inner side of the metal outer tube (11) are staggered, namely, a single-side fixing bolt rod (262) does not need to enter the blind holes (112) at first, the other end fixing bolt rod (262) is pressed, after the transducer sleeve is completely inserted into the metal outer tube (11), two transducer supporting columns (221) and (222) are clamped by a tool, and the transducer sleeve is rotated to enable the two fixing bolt rods (262) at the two ends to enter the respective blind holes (112) at the same time, so that installation and fixation are completed.

13. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: the water meter circuit box (55) is positioned on the outer side of the equal-diameter metal outer pipe (11) of the base meter of the flowmeter and consists of a lower meter circuit box shell (55A) and an upper meter circuit box shell (55B); the integrating circuit board (551), the instrument display screen (552) and the battery (553) are positioned in the instrument circuit box (55); the lower shell (55A) of the instrument circuit box is tightly matched with the outer ring of the outgoing line fixing seat (12) of the transducer in a cylindrical shape; as shown in fig. 5, particularly, the outer ring of the transducer outgoing line fixing seat (12) is further provided with a symmetrical positioning column structure (123) which is matched with the lower casing (55A) of the instrument circuit box, so that the instrument circuit box cannot rotate and is very firm; the symmetrical positioning column structures (123) are positioned on two sides of the outer ring of the outgoing line fixing seat (12) and are used for fixing the lower shell (55A) of the instrument circuit box to prevent the lower shell from rotating, so that the display direction of the instrument display screen (552) can be adjusted; in addition, the lead wire fixing nut (16) has two functions: firstly, the fixing head (14) of the leading-out wire of the transducer is pressed tightly by applying force to an elastic gasket (15); and the other function is to press the lower case (55A) of the instrument case.

14. The centered outgoing line and sealing structure of the DN15 ultrasonic correlation water meter as recited in claim 1, characterized in that: a straight-through pipe structure with DN15 caliber facilitates the laser welding of the outer end of the water outlet of the outer metal pipe, and the temperature sensor fixing seat (17) is used for installing the temperature sensor (171), so that the heat energy metering is facilitated.