CN115900864A - Embedded valve ball positioning structure adaptive to ultrasonic valve-controlled water meter - Google Patents

Abstract

The invention belongs to the technical field of flow metering and control equipment, particularly relates to an embedded valve ball positioning structure adaptive to an ultrasonic valve-controlled water meter, and aims to solve the problem of the embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter. In the present invention: the middle part of the valve ball is provided with a through hole, the upper part of the valve ball is inserted with a rotating drive rod, and the lower part of the valve ball is embedded with a valve ball positioning pin; a rotary positioning pin is embedded in a groove at the lower part of the valve ball and is arranged in a positioning pin special-shaped positioning groove in the necking rectifying pipe, so that the rotary positioning pin of the valve ball is limited to perform forward and reverse 90-degree rotary cut-off positioning; the necking down rectifying tube consists of two asymmetric parts, and the valve ball is wrapped and fixed through a cylindrical valve ball metal clasp and a gasket. The invention realizes the accurate positioning effect of opening and closing the ball valve while ensuring the constant metering precision characteristic, the maximized metering range ratio and the minimized initial flow of the ultrasonic water meter.

Description

Embedded valve ball positioning structure adaptive to ultrasonic valve-controlled water meter

Technical Field

The invention belongs to the technical field of flow metering and control equipment, and particularly relates to an embedded valve ball positioning structure adaptive to an ultrasonic valve-controlled water meter.

Background

In the era of stepping into the 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 type flowmeter and valve control system is gradually replaced by a full electronic type flowmeter and valve control system, and the irreversible trend is formed.

The valve-controlled water meter adopting the ultrasonic flowmeter and the valve control mode is already applied to the field of water metering and control. For a common ball valve, the outer tube body is usually a structure formed by combining two parts into a whole through threaded connection. For an ultrasonic flowmeter, the range ratio R is an important measurement index, and for a flowmeter base meter limited by the meter length, in order to avoid the influence of a valve body on flow measurement, the valve body structure formed by combining two parts into a whole in a threaded connection mode is usually arranged outside an ultrasonic measurement sound path, so that the effective sound path between two ultrasonic transducers is shortened, and the range ratio of the flowmeter is reduced.

In recent years, along with the great improvement of the calculation precision of the ultrasonic time difference circuit chip, the upgrading and improving steps of the valve-controlled ultrasonic water meter are also accelerated.

Aiming at the valve-controlled water meter adopting the ultrasonic flowmeter and the valve-controlled mode, the valve body is arranged in the ultrasonic measurement sound path, and the characteristic of flow measurement is not influenced, so that the problem to be solved urgently is solved. The application combines the research of ultrasonic wave propagation law and increasing range ratio calculus, combines the structural law of opening and closing of the valve, sums up the technical development direction of the ultrasonic wave valve control water meter and the principle of the optimized solution thereof, and sums up as follows:

(1) The principle of sound path maximization: in order to make the ultrasonic water meter have a large range ratio, the mode of maximizing the sound path between the ultrasonic transducers should be adopted as much as possible for the meter length size specified by the standard. Because the wide range ratio is an extremely important index for trade settlement and is also the most important technical index of the water meter, in order to make the ultrasonic water meter have the wide range ratio, the projection distance of the distance connecting line between the two transducers of the ultrasonic water meter in the water flow direction in the main pipe is maximized to obtain the larger range ratio and the smaller initial flow (for the water meter, the international standard in 2018 promotes the maximum value of the range ratio or the flow ratio to R = 1000).

The main performance indexes of the flowmeter are metering accuracy and range ratio, the metering accuracy is the ratio of the flow value of the flowmeter to the actual flow value, and the improvement of the flow stability of the fluid and the consistency of mass production are important conditions for determining the accuracy; 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 this regard, through theoretical deductive analysis, conclusions about the metering quality of the ultrasonic flowmeter can be drawn:

in the field of water metering, ratio of measuring ranges

Is defined as

Wherein, in the step (A),

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

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

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

The lower (corresponding to the flow rate thereof)

The lower, the

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

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

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

（

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

And

equal time intervals) of the measuring range ratio

Spaced from two transducers

The relationship between them is:

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

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

is prepared by reacting with

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

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

is prepared by reacting with

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) that is,

in the form of a circumferential ratio,

is the inner radius of the flow meter tubing,

in order to be used for metering,

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

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

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 the equation of time difference of the ultrasonic flowmeter

To obtain that

And thus, in the specific calculation,

according to

And (6) substituting. From the above relation, the following conclusions can be drawn:

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

The range ratio of the flowmeter can be effectively improved

。

Based on the above theoretical analysis and reasoning, such an important and key inference can be drawn here: for the ultrasonic valve-controlled water meter with limited length, considering that a valve is required to be arranged due to valve control, and the valve has certain length and volume, if the valve is arranged outside a sound path, the valve must occupy a part of the length of the ultrasonic valve-controlled water meter, so that the distance between two transducers of the ultrasonic valve-controlled water meter is shortened, and the measuring range ratio of the ultrasonic valve-controlled water meter is greatly reduced. Therefore, in order to maximize the sound path between the two ultrasonic transducers, namely maximize the range ratio, of the ultrasonic valve-controlled water meter with limited length, the only solution is to try to arrange the valve between the sound paths of the two ultrasonic transducers and avoid the blocking of the ultrasonic transmission between the two ultrasonic transducers and the influence of the valve on the flow characteristics.

(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 exists in the reflection transmission of sound waves (when the reflection surfaces are large enough, the sound energy loss is 10-20% in an ideal state, and the measurement is generally not influenced), and particularly when the reflection surfaces have angular deviation or are scaled after use, the energy loss can reach 40-60%, and the normal measurement is seriously influenced. In addition, the existence of the reflecting surface results in a complicated installation structure, and especially, improper water resistance distribution treatment of the reflecting surface also affects the metering precision.

(3) Principle of consistency of sealing safety and valve ball rotation resistance: the sealing of the valve ball ensures that the sealing safety of the valve body, the requirement of a sealing assembly for smoothness, the constant elasticity of the sealing ring (the constant compression amount of the sealing ring) and the same compression fastening force applied to the valve ball after installation are the same, so that the consistency principle of batch products is met. The pressing force cannot be too tight or too loose, the former can influence the rotating moment, and the latter can leak water to lose the valve function. Namely, after the valve ball is installed, under the same test condition, the idling torque of batch products is the same, the consistency is good, and the driving of a speed reducing motor is convenient.

(4) The principle of metering performance cannot be influenced after the valve is opened: according to the principle (1), if the valve is arranged in the sound channel (flow channel), when the valve is fully opened, the valve hole must be smoothly combined with the flow channel, and cannot be inclined to block, otherwise, the sound wave passing rate is influenced, namely, the sound wave amplitude is reduced, and the sound wave receiving is influenced; secondly, the flow speed of the flow channel is directly changed and deviates from a set standard fluid flow characteristic curve, so that the metering accuracy of the water meter flow meter is seriously influenced;

(5) A flow channel structure parameter consistency principle; the flow channel forming and processing technology of the ultrasonic water meter base meter has higher assembly installation precision and consistency requirements, and determines the precision 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 due to the individual difference of the base table can be reduced, and the complicated workload of manually performing error correction on the individual transducer at the later stage is reduced;

(6) The pipe 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 sealing reliability and durability.

(7) The principle of adaptability: the ultrasonic valve control meter is convenient to install a temperature sensor so as to adapt to the heat energy metering requirement.

(8) Simple structure, convenient assembly principle: the ultrasonic water meter has a simplified structure and unique certainty, so that the whole ultrasonic water meter is easy to assemble, and the flow meter can be guaranteed to have higher consistency.

According to the eight principles, for the small-caliber ultrasonic valve-controlled water meter, the most effective mode is to adopt the equal-diameter metal outer pipe to process and manufacture a base meter, so that the requirements of a built-in correlation type transducer structure, a valve ball arranged in a sound channel between two transducers and high consistency of batch products are met, namely the valve torques are the same.

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

The invention patent application publication number CN 107356298A provides a valve-controlled ultrasonic water meter, wherein ultrasonic transmission adopts a reflection type; the control valve is arranged outside the sound channel; the valve ball is fixedly butted with the main pipe through a threaded joint with an external thread; the valve ball has no open position. It can be seen that the reflection type of ultrasonic transmission is not in accordance with principle (2); the control valve is arranged outside the sound channel and does not accord with the principle (1); when the valve ball is fixedly butted with the main pipe through the threaded joint with the external thread, the valve ball cannot be ensured to have the same fastening pressing force during batch installation and is not in accordance with the step (3); the valve ball does not have opening degree positioning which is not in accordance with the (4).

Patent application publication No. CN 202903255U proposes a meter-valve integrated ultrasonic meter, in which ultrasonic transmission adopts a reflection type; unlike patent CN 107356298A, which recognizes the importance of increasing the turndown ratio, a control valve is placed inside the acoustic channel to increase the acoustic path; the valve ball is fixed by butting with the inner side of the main pipe through a threaded pipe with an external thread; the valve ball has no open position. It can be seen that the reflection type of ultrasonic transmission is not in accordance with principle (2); when the valve ball is fixedly butted with the main pipe through the threaded joint with the external thread, the valve ball cannot be ensured to have the same fastening pressing force during batch installation and is not in accordance with the step (3); the valve ball has no opening position which is not in accordance with the opening position (4).

Patent grant publication No. CN 211317424U proposes a meter-valve integrated ultrasonic flowmeter, in which ultrasonic transmission adopts a correlation type; the control valve is arranged in the sound channel; the valve ball is pressed and fixed by metal rings with external threads on the two ends of the pipe through the butt extrusion of the linings at the two ends; the valve ball is not positioned in an opening degree; it can be seen that the lining pipe is fixed by the metal rings with external threads at the two ends of the pipe for integral sealing, so the lining pipe is not in accordance with the method (6); when the whole is sealed, if heat supply metering is needed, the temperature sensor is not easy to be installed and is not in accordance with the temperature sensor (7); the valve ball has no opening positioning which is not in accordance with the positioning method (4); although the pressing force of the valve ball is fixed by the pressing and fastening of the middle flow pipe, if the pressing force of the pressing rings on the two sides of the pipe is insufficient or becomes loose after long-term use, the valve ball can seriously leak water and lose the valve function, which is not in accordance with the step (3); in addition, as shown in the patent figure 1, the valve ball is fixed by two lining pipes in an abutting mode, and an abutting line is located in the middle of the valve ball. If a fit clearance exists between the lining rectifying pipe and the inner side of the metal outer pipe, the butt joint of the two lining pipes is uneven (inclined), so that the valve ball is pressed unevenly to cause liquid leakage.

In summary, for the meter-valve integrated ultrasonic flowmeter, if the sound path is to be increased, and thus the range ratio R is to be increased, a valve ball needs to be arranged in the middle of the ultrasonic flowmeter with a given length to form a valve, and the structure is greatly different from the common valve.

According to the GB/T8464-2008) standard, when the valve is fully opened, the angle deviation between the axis of the through hole of the ball body and the axis of the through hole of the valve body is not more than 3 degrees, so that almost all common ball valves are applied according to the standard and do not perform rotary stop positioning on the valve ball in the valve, and the requirement of the conventional application of the common ball valves does not meet the requirement of the necessity. However, for the ultrasonic valve-controlled water meter, the valve ball is placed on the ultrasonic sound path for metering, and the deviation of the angle between the axis of the through hole of the ball body and the axis of the through hole of the valve body is 1-3 degrees, which seriously affects the flowing state of the fluid (i.e. affects the flowing speed and the flowing stability of the fluid and deviates from a calibration value), blocks the transmission amplitude of the sound wave, and affects the metering signal and the metering characteristics, so that the positioning of the valve ball is very necessary.

The opening and closing control of various electric ball valves at present is outside the valve body, and is driven by a speed reducing motor and positioned by opening and closing. The valve-controlled water meter adopting the mode has the problem that the valve ball is not opened or closed in place. This is due to: firstly, the speed reducing motor needs to be positioned; secondly, because the reducing motor is connected with the valve ball through the valve rod, the two ends are positioned and matched with the clearance; the two separated parts, namely the on-off stop setting positions of the speed reducing motor and the on-off rotation of the valve ball cannot be accurately synchronized.

For the products produced in batch, the difference of the angle deviation is more serious and inevitable, and the axis of the through hole of the ball body and the axis of the through hole of the valve body cannot be accurately synchronized, so that the direct positioning on the valve ball is very necessary.

Therefore, for a given length of ultrasonic valve-controlled water meter, if the range ratio R is increased by maximizing the sound path between transducers, i.e. maximizing the range ratio, a valve ball is required to be arranged in the middle of the given length of ultrasonic flow meter to form a valve, and the special valve must meet the following requirements:

(1) When the valve is fully opened, the axis of the through hole of the ball body is accurately superposed with the axis of the through hole of the flowmeter body; when the valve is completely closed, the axis of the through hole of the ball body forms an angle of 90 degrees with the axis of the through hole of the flowmeter tube body;

(2) When the valve ball is arranged and fixed in the flow pipe, the influence on the holding force or the sealing state of the valve ball cannot be changed due to the assembly and installation of the valve ball and the sealing element thereof;

(3) The valve ball arranged in the flow pipe cannot change the holding force or the sealing state of the valve ball due to the assembly and installation of the flow pipe section;

(4) The valve ball is arranged and fixed in the flow pipe, the holding force of the valve ball can be manually controlled and set, and once the holding force is set, the holding force is not allowed to be changed;

(5) The rotation moment of the sphere is small.

Therefore, the ball valve which is adapted to the ultrasonic valve-controlled water meter needs to meet the five requirements, so that when the ball body is opened, the axis of the through hole is completely aligned and superposed with the axis of the through hole of the runner; namely, the ball can accurately complete the full-open and full-close positioning of 90 degrees in the pipe, and does not have any influence on the fluid flow, the measured sound wave and the measurement precision in the ultrasonic valve-controlled water meter, which is a great problem to be solved in the industry at present.

Disclosure of Invention

In order to solve the above-mentioned difficult problem that puts forward, this application obeys above-mentioned eight principles that require to ultrasonic wave valve accuse water gauge and to five point constraint conditions of built-in valve ball, proposes an adaptation ultrasonic wave valve accuse water gauge's embedded valve ball location structure, and its technical scheme is: the ultrasonic water meter is characterized in that a transducer and a control valve are installed in a through pipe of the ultrasonic water meter, and the embedded valve control positioning structure can position and fix the ball valve in a sound channel between a pair of transducers in the through pipe in a mode that the transducers are horizontally opposite to each other, namely, the ultrasonic valve control water meter is guaranteed to have the maximum range ratio R. The valve ball driving torque can be kept the same when the valve ball rotates smoothly and the flowmeter base meter is in the same state during batch production, and the opening and closing stroke stop of the valve ball can be accurately positioned, namely, the valve ball through hole and the flow channel through hole are ensured to be coincident when the valve is fully opened. The substantial improvement has the special benefits of solving the problems that the existing ball valve is not closed in place and leaks; the ultrasonic signal transmitting and receiving amplitude intensity is influenced due to the fact that the ultrasonic signal is not opened in place, and time difference calculation is further influenced; furthermore, the flow velocity change of water flow caused by the misalignment of the valve ball through hole and the flow channel through hole axis can directly change the originally set flow state of the flowmeter, thereby causing the fatal defects of abnormal metering or serious deviation of precision.

The invention relates to an embedded valve ball positioning structure adaptive to an ultrasonic valve-controlled water meter, which is characterized by comprising an equal-diameter metal outer pipe of a flowmeter base meter, a special-shaped transducer, a valve ball rotating positioning pin, a necking rectifier tube, a cylindrical valve ball metal clasp, a transducer outgoing line fixing seat, a valve rod fixing seat, a rectifier tube fixing seat, a water meter circuit box and an outgoing line fixing cap, wherein the equal-diameter metal outer pipe is provided with a plurality of rectangular cross sections; the embedded valve control positioning structure for the straight pipe water meter flowmeter is characterized in that a base meter outer pipe is an equal-diameter metal outer pipe; the special-shaped transducer consists of a special-shaped transducer structural part and a transducer deflector cap and is arranged at two ends of the inner side of the equal-diameter metal outer pipe; the middle part of the valve ball is provided with a through hole, the upper part of the valve ball is inserted with a rotary driving rod, and the lower part of the valve ball is embedded with a valve ball positioning pin in a matching way; a rotary positioning pin is embedded in a groove at the lower part of the valve ball, and is arranged in a positioning pin special-shaped positioning groove in the necking rectifying pipe, so that the valve ball and the rotary positioning pin are limited to rotate at a positive angle and a negative angle of 90 degrees to be cut off and positioned; the necking rectifier tube consists of two sections which are asymmetrical front and back, and the valve ball is wrapped and fixed through a cylindrical valve ball metal clasp and a polytetrafluoroethylene ring gasket; the two transducer structural parts are respectively bonded with the two reducing rectifier tubes through adhesion or laser welding, and then positioned, wrapped and fixed through the cylindrical valve ball metal clasps to form an integral lining structure; under the coordination of an isometric metal outer pipe as a central framework, a transducer leading-out wire fixing seat, a valve rod fixing seat, a rectifier tube fixing seat, a water meter circuit box and a leading-out wire fixing cap, the embedded valve ball positioning structure for the ultrasonic straight pipe valve control water meter is formed, and the accurate positioning targets of opening and closing of the ball valve are achieved while the characteristics of the water meter metering accuracy are guaranteed to be unchanged, the metering range ratio is maximized, and the initial flow is minimized.

The solution can perfectly solve the problem of the valve ball opening and closing precision and the synchronous problem of the speed reducing motor, so that the valve control ultrasonic water meter can measure more accurately.

The flowmeter base table outer tube be the equal diameter metal outer tube, there is the pipe thread equal diameter metal outer tube both ends outside, there are lead-out wire fixing base, valve rod fixing base, rectifier tube fixing base and temperature sensor mount pad on the equal diameter metal outer tube.

The special-shaped transducer consists of a flow guide cap and a special-shaped transducer structural part, is arranged at two ends of the inner side of the equal-diameter metal outer pipe and is respectively butted with the necking rectifier tubes; the two necking rectifying tubes are of an asymmetric structure, pipe orifices of the two necking rectifying tubes are positioned and butted by convex and concave surfaces, the valve ball is positioned in the necking rectifying tube on one side, two sides of the valve ball are tightly embraced by polytetrafluoroethylene ring gaskets, and elastic sealing rings are arranged on the outer sides of the polytetrafluoroethylene ring gaskets and are embedded in grooves of the necking rectifying tubes; a rotary positioning pin is embedded in a groove at the lower part of the valve ball and is arranged in a positioning pin special-shaped positioning groove in the necking rectifying pipe at one side, so that the rotary positioning pin of the valve ball is limited to perform forward and reverse 90-degree rotary cut-off positioning; valve ball drive shaft and sealing washer are installed in valve ball upper portion drive recess, the metal armful of tube-shape valve ball detains and comprises two parts of symmetry, and it turns over along inserting two necking down rectifier tube outside recesses after the butt joint in it, fastens both, and settles in the constant diameter metal outer tube, forms a whole, and above-mentioned structure forms a pair of correlation formula transducer inside lining valve ball rotational positioning body structure.

The front part of the special-shaped transducer is provided with a diversion cap, the main body of the special-shaped transducer is a transducer structural member, and the transducer ceramic chip component is assembled in a blind hole in the middle of the transducer structural member; the middle part of the special-shaped transducer structural part is connected with the inner side of the outer ring through an upper supporting column and a lower supporting column respectively; the inner hole of the upper support column is an inclined hole of an outgoing line of the transducer, one end of the inner hole is communicated with the inside of the transducer, and the other end of the inner hole is communicated with a central through hole of a fixed head of the outgoing line of the transducer; the outgoing line of the energy converter is led out from the interior of the energy converter to the integrating circuit PCB through the inclined hole of the outgoing line and the central hole of the fixed head of the outgoing line; and after the leading-out wire of the transducer is led out from the center hole of the leading-out wire fixing head of the transducer, the air guide sleeve is buckled, and high-strength two-component A, B glue is injected into the transducer from the center hole of the leading-out wire fixing head through the inclined hole, so that the inner cavity of the transducer is filled, cured and waterproof.

The transducer outgoing line fixing seat is positioned on the outer side of the equal-diameter metal outer pipe of the flowmeter base meter and on the inner side of the metal outer pipe thread; the transducer outgoing line fixing head is positioned at the lower end inside the transducer outgoing line fixing seat, and the height of the transducer outgoing line fixing head is positioned by the positioning table; the elastic washer is located above the fixing head of the outgoing line of the transducer, and the outgoing line fixing nut is located above the elastic washer.

The water meter circuit box is positioned on the outer side of the equal-diameter metal outer pipe of the base meter of the flowmeter and consists of an instrument circuit box lower shell and an instrument circuit box upper shell; the integrating circuit board, the instrument display screen, the speed reducing motor and the battery are positioned in the instrument circuit box, and the lower shell of the instrument circuit box is tightly pressed and fixed by an outgoing line fixing nut; the outer side of the water outlet end of the metal shell body of the base meter can be provided with a temperature sensor mounting seat, and the temperature sensor is mounted in the temperature sensor mounting seat.

The assembly process and the working principle of the embedded valve ball positioning structure adapted to the ultrasonic valve-controlled water meter provided by the invention are further described as follows:

the outer tube of the flowmeter base meter is an equal-diameter metal outer tube, and the outer sides of two ends of the equal-diameter metal outer tube are provided with tube threads, so that the equal-diameter metal outer tube is conveniently connected with an outer pipeline through a loose joint. The outer side of the equal-diameter metal outer pipe is welded with the outgoing line fixing seat, the valve rod fixing seat, the rectifier tube fixing seat and the temperature sensor mounting seat in a laser welding mode. The special-shaped transducer structural part is arranged at two ends of the inner side of the equal-diameter metal outer pipe, and the flow guide cap is finally arranged on the special-shaped transducer structural part. The inner sides of the two transducer structural parts are respectively butted with the convex and concave parts of the two necking rectifying tubes, and the two transducer structural parts are positioned and then welded into a whole by laser, namely the whole lining can be divided into two parts, and a valve ball is arranged between the two parts.

Valve ball and accessory installation operation process: and sequentially placing a rubber ring and a polytetrafluoroethylene ring pad in a groove between the two necking rectifying tubes. Then, a valve ball rotation positioning pin is placed in a special-shaped positioning groove of the necking rectifier on the right side, and attention is paid to the fact that as shown in the attached drawing 4, a straight positioning pin is placed along the direction of a flow channel, the groove on the lower portion of the valve ball is aligned with the straight positioning pin, the valve ball is pushed into the necking rectifier, the positioning pin is embedded into the groove on the lower portion of the valve ball, then the two necking rectifiers are in butt joint, the inward turned edges of the two symmetrical cylindrical valve ball metal clasps are buckled in the grooves on the outer sides of the two necking rectifiers, the width of the grooves is consistent with the metal thickness of the cylindrical valve ball metal clasps, and the valve ball and the fixing part of the valve ball are assembled in a tight fit mode.

After the valve ball is assembled, as shown in fig. 2, the cylindrical valve ball metal clasps and positions the middle parts of the two necking rectifying tubes, and a lining tube connector is formed under the cooperation of the special-shaped transducer structural member and the necking rectifying tubes. The lining connector and the sealing ring in the groove of the outer ring of the necking rectifying tube are inserted into the equal-diameter metal outer tube, and the outer sealing ring plays a role in blocking water and tightly matching the necking rectifying tube and the inner side of the metal outer tube. Therefore, a lining whole body is formed in the metal outer pipe, and the installation of the lining valve control pipe body structure of the correlation type transducer is completed.

The valve ball of necking down rectifier valve stem hole lower part opens, closes the injection molding that ends special-shaped positioning groove and forms: the plastic mould is formed by drawing the special-shaped positioning groove from the upper part through the valve rod hole of the necking rectifying tube, and the inner part is formed by drawing the inner hole of the necking rectifying tube left and right.

The length of the lining valve control tube body structure of the correlation type transducer is 0.3mm less than that of the single side of the equal-diameter metal outer tube, and the length of the lining valve control tube body structure of the correlation type transducer is used for bearing extrusion force exerted by a sealing rubber gasket mainly by a metal tube opening of a butt joint port when a loose joint of a flowmeter is installed, so that the lining tube can be effectively protected, and the lining tube is stressed less and cannot deform in long-term use.

The positioning and fixing structure of the embedded ball valve has the following advantages that:

(1) The invention relates to an accurate opening and closing positioning structure of an embedded valve ball for a water meter flowmeter, which comprises a linear rotating positioning pin of the valve ball, a special-shaped positioning groove, the valve ball, a necking rectifying tube, a polytetrafluoroethylene ring gasket and an O-shaped sealing ring. The structure can ensure that the axes of the valve ball through hole and the flow passage through hole are overlapped when the valve is opened, and the substantial structural improvement has the special advantages of solving the problems that the existing ball valve is not closed in place and the ball valve leaks; the ultrasonic signal transmitting and receiving amplitude intensity is influenced due to the fact that the ultrasonic signal is not opened in place, and time difference calculation is further influenced; furthermore, the flow velocity change of the water flow generated by the misalignment of the valve ball through hole and the flow passage through hole can directly change the originally set flow state of the flowmeter, thereby causing the fatal defects of abnormal metering or serious deviation of precision.

(2) Polytetrafluoroethylene ring pads and O type sealing washer are installed to valve ball both sides: the O-shaped sealing ring provides sealing and elasticity; the polytetrafluoroethylene ring gasket provides a proper sealing holding force and a low friction coefficient for the valve ball, and the combination forms a water-tight structure with the low friction coefficient of the valve ball.

(3) As shown in figure 4, the front and rear necking rectifying tubes are matched and positioned up and down, the tube sides are in hard contact, and then the cylindrical valve ball metal clasping buckle is used for positioning and fastening, and the cylindrical valve ball metal clasping buckle has the characteristics that the front and rear necking rectifying tubes are prevented from being subjected to external pressure and pulling force to cause the change of the force for pressing the valve ball, so that the driving force of the valve ball is ensured to follow a set value. Therefore, the holding force of the valve ball is mainly determined by the compression amount provided by the O-shaped sealing ring. According to the standard of the valve sealing ring, the compression amount of the unilateral sealing ring can be controlled between 0.2 mm and 0.5mm by referring to the driving force designed by the speed reducing motor, so that the water tightness of the ball body and the low friction resistance of the rotation of the valve ball are completely ensured.

(4) Because the fittings are produced in a standardized way, the holding force borne by the valve ball is constant during batch production, and the metal holding buckle of the cylindrical valve ball is clamped in the thin grooves of the front and rear necking rectifying pipes, so that a very stable valve body structure is formed under the wrapping of the metal outer pipe.

(5) The valve ball rotates and is the tight fit between the constant head tank that corresponds on locating pin and the valve ball, does not have the clearance, rotates the locating pin and arranges in necking down the intraductal special-shaped positioning groove of end pin in the rectifier, and this structure can restrict the valve ball and rotate the locating pin and carry out just, anti-90 rotation end location, and this has just guaranteed effectively that the valve ball aperture is accurate, and the fluidic metering characteristic of flowmeter does not receive gear motor's position fixing deviation and rotates the influence of positioning deviation arousing valve ball aperture deviation.

(6) The valve ball fixing mode in the invention is different from the mode that the valve ball in the patent grant publication No. CN 211317424U is in butt joint and fixing by the seam of two lining pipes, and the valve ball is arranged in the necking rectifying pipe on one side, so that the condition that when a gap exists between the lining pipes and the outer pipe, the butt joint of the two lining pipes is uneven (inclined), and different positions on the valve ball are pressed unevenly to cause liquid leakage is avoided.

Due to the polytetrafluoroethylene cushion, the rotation resistance of the valve ball is small. The valve ball in patent grant publication No. CN 211317424U only has a sealing ring, and the structure has relatively large rotating friction force, poor durability of a direct friction sealing ring and leakage risk.

The rectifier tube positioning nut and the sealing ring are positioned in the rectifier tube fixing seat, and the protruding parts of the rectifier tube positioning nut and the sealing ring extend into the blind holes corresponding to the rectifier tubes to position and fix the two rectifier tubes.

And after the valve ball driving shaft and the sealing ring are inserted into the valve ball upper driving groove from the middle hole of the valve rod fixing seat to be butted, the speed reducing motor is installed in the lower box of the instrument circuit box, and the installation of the electric control valve is completed.

The middle part of the special-shaped transducer structural part is provided with a blind hole, a ceramic sheet assembly is packaged in the blind hole, a lead-out wire is welded, a guide cap is not required to be installed at the moment, the integral lining sleeve is inserted into the metal pipe, and the integral lining sleeve is installed and fixed. And then the outgoing line of the transducer penetrates out of the outgoing line fixing head through the outgoing line inclined hole. And then, buckling a flow guide cap to finish the installation of the transducer and the leading-out of the leading-out wire. Furthermore, a flat-head thin needle tube is used for filling the double-component A, B glue into the transducer from a middle hole of the leading-out wire fixing head through an inclined hole of the leading-out wire, so that the special-shaped transducer structural member and the transducer deflector cap are tightly combined into a whole, and the end of the deflector cap is provided with a circle of groove which is used for participating in the fastening connection of A, B glue.

The lead-out wire fixing head is located lead-out wire fixing base through-hole lower part, is fixed a position by the locating platform, and its effect has: firstly, a convex position at the lower part of the energy converter is embedded into a groove of the energy converter structural member, and a wire outlet of the special-shaped energy converter structural member is positioned and fixed; secondly, because the leading-out wire fixed head has the location platform, so its compression volume to the sealing washer can be invariable. 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 lead-out wire fixing head is positioned by the positioning surface, an elastic gasket is arranged above the lead-out wire fixing head, and the lead-out wire fixing cap is arranged above the elastic gasket and plays a role in compressing the elastic gasket by a constant force so as to compress the lead-out wire fixing head.

The leading-out wire of the energy converter passes through the inclined hole from the ceramic chip component and passes through the central holes of the leading-out wire fixing head, the spring washer and the leading-out wire fixing nut to be led out into the instrument circuit box.

The water meter circuit box is positioned on the outer side of the equal-diameter metal outer pipe of the base meter of the flowmeter and consists of a lower meter circuit box shell and an upper meter circuit box shell. The integrating circuit board, the instrument display screen, the speed reducing motor and the battery are positioned in the instrument circuit box. The center of the outgoing line fixing nut is provided with a hexagonal screw hole, and the outgoing line fixing nut can be screwed through the hexagonal screw hole so as to compress and fix the lower shell of 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. The lead 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 case of the circuit instrument case. Thus, the fixing of the bottom shell of the circuit instrument box is completed by applying an extremely simple method. According to actual demand, can make it reach IP68 protection level to waterproof glue of embedment in the circuit instrument circuit box.

Rectifier tube fixing base and valve rod fixing base are located equal footpath metal outer tube outer end both sides respectively, and clamping screw and sealing washer are located the rectifier tube fixing base for two necking down rectifier tubes of location, fixed.

The fixing of the integral pipe of the inner pipe of the flowmeter is as follows: the upper part is pressed and fixed from two ends by two outgoing line fixing heads; the lower part of the rectifying tube is compressed and fixed by two necking rectifying tubes at the middle part by a compression screw rod to form a stable fixed integral structure.

The fixing nut protective shell is connected with the lower hole clamping opening of the instrument circuit box and used for protecting the rectifier tube fixing nut.

When the invention meets the requirement of heat supply metering, because the integral lining and the metal outer pipe body of the flowmeter do not need to be sealed and waterproof at two ends integrally, the temperature sensor is convenient to be arranged. The temperature sensor mount pad is located the equal diameter metal outer tube outer end, and temperature sensor installs in the temperature sensor mount pad, and the temperature probe can pass the inside lining and insert in the outside of transducer water conservancy diversion cap to one side and need not do special waterproofly, has accomplished the temperature measurement and has not influenced the flow measurement characteristic.

In conclusion, compared with the prior art, the valve ball positioning device has prominent substantive characteristics and remarkable progress on the arrangement and the opening positioning of the valve ball, is effective through practice verification, and has novelty, creativity and practicability.

The concrete expression is as follows:

firstly, for the small-caliber ultrasonic flowmeter base meter with limited length, the invention can arrange two built-in special-shaped transducer structural parts close to two ends of the inner side of the equal-diameter metal straight pipe by changing the lead-out wires and the sealing structure of the built-in special-shaped transducer structural parts, and the lead-out wires can be led out through the inclined holes of the lead-out wires, so that the special-shaped transducer structural parts can be arranged close to the inner sides of the two ends of the equal-diameter metal outer pipe as much as possible without considering the influence caused by the position dislocation of the transducer lead-out wire fixing seats on the inner side of the pipe threads, therefore, the distance between the transmitting surfaces of the two transducers can be effectively increased as much as possible, namely, the sound path is increased, the range ratio R is improved, and the purposes of maximizing the range ratio and minimizing the initial flow are realized.

Secondly, because the gap of the part of the special-shaped transducer structural part with the transducer and the cross section area through which fluid passes are the minimum, 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; in addition, by changing the leading-out wire and the sealing structure of the built-in special-shaped transducer, the minimum water flow gap of the DN 15-caliber straight-through pipe can be ensured to be larger than 3mm, and the safe passing of impurities is facilitated. The characteristics reduce the water flow blockage, increase the cross-sectional area of water, reduce the pressure loss and ensure the safe passing of impurities in water.

Thirdly, the accurate opening and closing positioning structure of the embedded valve ball for the water meter flowmeter comprises a valve ball linear rotating positioning pin, a special-shaped positioning groove, a valve ball, two asymmetric necking rectifying tubes, a polytetrafluoroethylene ring gasket and an O-shaped sealing ring, and the accurate opening and closing positioning structure of the embedded valve ball for the ultrasonic straight tube valve-controlled water meter flowmeter is formed under the cooperation that two parts of symmetric cylindrical valve balls are buckled in the grooves on the outer sides of the front necking rectifying tube and the rear necking rectifying tube in a metal clasping mode. The structure can ensure that the axes of the valve ball through hole and the flow passage through hole are overlapped when the valve is opened, and the substantial structural improvement has the special advantages of solving the problems that the existing ball valve is not closed in place and the ball valve leaks; the ultrasonic signal transmitting and receiving amplitude intensity is influenced due to the fact that the ultrasonic signal is not opened in place, and time difference calculation is further influenced; furthermore, the flow velocity change of water flow caused by the misalignment of the valve ball through hole and the flow channel through hole axis can directly change the originally set flow state of the flowmeter, thereby causing the fatal defects of abnormal metering or serious deviation of precision.

Fourthly, as shown in fig. 4, the valve ball is arranged in the necking rectifying tube at one side and is positioned and fastened by the cylindrical valve ball metal clasp, and the special structure and the cylindrical valve ball metal clasp are characterized in that the force for pressing the valve ball is not changed due to external pressure and pulling force of the two necking rectifying tubes, so that the driving force of the valve ball is ensured to follow a set value. Therefore, the factor of the holding force applied to the valve ball is mainly provided by the compression amount of the O-shaped sealing ring. According to the standard of a valve sealing ring, the compression amount of the unilateral sealing ring is controlled to be controlled between 0.2 mm and 0.5mm according to the designed driving force of the speed reducing motor, so that the water tightness of a ball body and the rotational friction resistance of the valve ball can be completely ensured.

Fifthly, further, the valve ball rotation positioning pin is in close fit with the corresponding positioning groove on the valve ball, no gap exists, the rotation positioning pin is arranged in the stop pin special-shaped positioning groove in the necking rectifying pipe on one side, and the structure can limit the rotation positioning pin of the valve ball to rotate by plus and minus 90 degrees to stop positioning, so that the accuracy of the opening of the valve ball is effectively guaranteed, and the metering characteristic of flow meter fluid is not influenced by the position fixing deviation and the rotation positioning deviation of the speed reducing motor.

Sixth, the fixing method of the valve ball in the invention is different from the fixing method of the valve ball in patent grant publication No. CN 211317424U in which the valve ball is fixed by the joint of two lining pipes in a butt joint manner, and the valve ball is installed in the necking rectifying pipe on one side, so that the situation that when a gap is left between the valve ball and the outer pipe, the butt joint of the two lining pipes is uneven (inclined), and the situation that liquid leaks due to uneven pressure on different positions on the valve ball is avoided.

Seventh, the fixing of the integral lining pipe of the flowmeter of the present invention: the upper part is pressed and fixed from two ends of the tube by two outgoing line fixing heads; the lower part of the telescopic pipe is pressed and fixed at the middle part by two necking rectifier fixing bolts to form a stable fixing whole.

Eighth, the transducer lead-out wire fixing head is used for carrying out height positioning through the positioning table in the lead-out wire fixing seat, so that reasonable compression of a sealing ring at the lower end of the lead-out wire fixing head can be guaranteed, the lower part of the lead-out wire fixing head can be embedded into a special-shaped transducer structural member, and the functions of positioning and fixing the special-shaped transducer structural member are achieved.

Ninth, the lead-out wire fixing nut of the present invention realizes the function of the first generation and the second generation, and compresses the transducer lead-out wire fixing head by applying force to the elastic washer; meanwhile, the lower shell of the circuit instrument box is pressed and fixed, and lower shell fixing devices are reduced.

Tenth, the connection between the two necking rectifying tubes and the transducer structural members at the corresponding two ends is completed in an adhesive mode or a laser welding mode at a joint, and the two necking rectifying tubes and the transducer structural members form a section of lining tube body integral structure; the second purpose is to ensure the distance between the transmitting surfaces of the two transducers to be consistent during batch production, the consistency of the parameters of the flowmeter can be realized, the metering precision is improved, and the detection and calibration of the flowmeter are greatly facilitated.

Eleventh, 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 effect is that when the loose joint of the flowmeter is installed, the extrusion force of the sealing rubber gasket is mainly received 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.

Twelfth, the liner of the small-diameter straight-through correlation type ultrasonic valve-controlled water meter of the present invention and the inner side of the metal outer pipe are not integrally sealed, so that the temperature sensor is convenient to install, and can be used for heat energy metering.

The invention achieves the realization from the proposal of a complete technical scheme to the technical scheme: the special-shaped transducer pipeline structure, the accurate positioning of the valve in the tube and the opening and closing rotation of the valve in the tube, the local multi-stage sealing with extremely high safety, the convenience for leading out a transducer signal wire, the positioning and fixing of a lining tube, the integration circuit shell fixing structure and the like are achieved.

Drawings

FIG. 1 is a sectional view of an embedded valve ball positioning structure of an adaptive ultrasonic valve-controlled water meter;

FIG. 2 is an exploded view of a liner structure comprised of an embedded valve ball and a profiled transducer;

FIG. 3 is a side view of an in-line valve ball positioning structure adapted to an ultrasonic valve-controlled water meter;

FIG. 4 is a schematic view of the ultrasonic wave straight pipe valve-controlled water meter rectifier tube butt joint and the embedded valve ball positioning pin;

FIG. 5 is a schematic view of an ultrasonic straight tube valve-controlled water meter embedded rectifier and a cylindrical valve ball metal clasp;

FIG. 6 is a schematic view of an ultrasonic straight-tube valve-controlled water meter temperature sensor seat and a protecting cover of a rectifier tube fixing seat;

in the figure:

11. an equal-diameter metal outer pipe; 111. pipe threads; 13. a lead-out wire fixing seat; 131. a positioning table; 132. a seal ring; 251. a lower seal ring; 252. a side seal ring; 24. a ceramic sheet assembly; 25. a lead-out wire fixing head; 26. an elastic washer; 27. fixing a nut; 22. a transducer structure; 221. the single side difference between the inner lining and the outer pipe; 222. an outgoing line inclined hole; 223. an upper support column; 224. a lower support pillar; 23. a flow guide cap; 231. a lower groove of the deflector cap; 28. a transducer signal line; 14. a valve rod fixing seat; 37. a valve drive stem; 371. a seal ring; 40. a concave-convex structure; 41. a reduction motor; 12, a rectifier tube fixing seat; 121. a rectifier tube fixing bolt; 122, a sealing ring; 31. a rectifier tube A;32. a rectifier tube B;311. a seal ring groove; 3111. a seal ring; 312. a seal ring assembly groove; 33. a valve ball; 321. a valve stem receptacle; 34. positioning pins; 323. a positioning pin fixing groove; 322. a metal clasping and buckling installation groove; 35. polytetrafluoroethylene ring gaskets; 39. a seal ring; 36. the cylindrical valve ball is clasped with metal; 361. inward turning edges; 15. a temperature sensor mounting base; 151. a temperature sensor; 55. an instrument case; 55A, an instrument box bottom shell; 55B, an upper shell of the instrument box; 55C, a protective shell; 553. a battery; 551. a circuit board; 552 a display screen;

Detailed Description

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

Example (b):

the embodiment is a positioning structure of a DN15 small-caliber ultrasonic straight pipe valve-controlled water meter embedded valve ball for measuring hot water flow and heat metering.

The overall appearance is shown in fig. 6, and the internal main components are as shown in fig. 1. This embodiment include flowmeter base table outer tube be equal diameter metal outer tube 11, there is pipe thread 111 equal diameter metal outer tube both ends outside, there are lead-out wire fixing base 13, valve rod fixing base 14, rectifier tube fixing base 12 and temperature sensor mount pad 15 on the equal diameter metal outer tube 11.

The special-shaped transducer consists of a diversion cap 23 and a special-shaped transducer structural part 22, is arranged at two ends of the inner side of the equal-diameter metal outer pipe 11, and is respectively butted with the necking rectifying pipes 31 and 32. The mouth of pipe is by the butt joint of concave-convex surface location between necking down rectifier tube 31 and 32, valve ball 33 is located necking down rectifier tube 32, and the valve ball both sides are held tightly by gathering tetrafluoro ring pad 35, and gather tetrafluoro ring pad 35 outside elasticity sealing washer 39, all inlay in the recess 312 in necking down rectifier tube 31, 32. The lower groove of the valve ball is embedded into a rotary positioning pin 34, the rotary positioning pin 34 is arranged in a positioning pin special-shaped positioning groove 323 in the necking rectifying tube 32, and the rotary positioning pin 34 of the valve ball is limited to rotate by 90 degrees in the positive direction and the negative direction to stop positioning. The valve ball driving shaft 37 and the sealing ring 371 are installed in the driving groove on the upper part of the valve ball 33, the cylindrical valve ball metal clasping button 36 is composed of two symmetrical parts, the inward turning edge 361 fastens the inserted and butted necking rectifying pipes 31 and 32 by the middle groove 322, and forms a whole in the equal-diameter metal outer pipe 11. The structure forms a pair of correlation type transducer lining valve ball rotation positioning tube body structures.

The front part of the special-shaped transducer is provided with a diversion cap 23, the main body of the special-shaped transducer is a transducer structural member 22, and the transducer ceramic chip component 24 is assembled in a blind hole in the middle of the transducer structural member 22. The middle part of the profiled transducer structural part 22 is connected with the inner side of the outer ring by an upper support column 223 and a lower support column 224 respectively. The inner hole of the upper support column 223 is a transducer outgoing line inclined hole 222, one end of which is communicated with the inside of the transducer, and the other end of which is communicated with the central through hole of the transducer outgoing line fixing head 25. The transducer signal lead-out wire 28 is led out from the interior of the transducer through the lead-out wire inclined hole 222 and the central hole of the lead-out wire fixing head 25. After the leading-out wire 28 of the transducer is led out from the central hole of the leading-out wire fixing head 25 of the transducer, the diversion cap 23 is buckled, and then high-strength two-component A, B glue is injected into the transducer from the central hole of the leading-out wire fixing head 25 through the inclined hole 222, so that the inner cavity of the transducer is filled, cured and waterproof. The groove 231 at the lower part of the deflector cap is bonded with A, B glue, and after curing, the deflector cap 23 is stably bonded with the transducer structural member 22.

The transducer lead-out wire fixing seat 13 is positioned on the outer side of the equal-diameter metal outer pipe 11 of the flowmeter base surface and on the inner side of the thread 111 of the metal outer pipe 11. The transducer lead-out wire fixing head 25 is located at the lower end inside the transducer lead-out wire fixing base 12, and the height of the transducer lead-out wire fixing head is located by the locating table 131. The elastic washer 26 is positioned above the transducer lead wire fixing head 25, and the lead wire fixing nut 27 is positioned above the elastic washer 26.

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, the meter display screen 552, the speed reducing motor 41 and the battery 553 are positioned in the meter circuit box 55, and the lower shell 55A of the meter circuit box is pressed and fixed by the outgoing line fixing screw cap 27. The outer side of the water outlet end of the base meter metal outer shell 11 is provided with a temperature sensor mounting seat 15, and the temperature sensor 151 is mounted in the temperature sensor mounting seat 15.

The assembly process and the working principle of the embedded valve ball positioning structure adapted to the ultrasonic valve-controlled water meter provided by the application are further described as follows:

the outer tube of the flowmeter base meter is an equal-diameter metal outer tube 11, and tube threads 111 are arranged on the outer sides of two ends of the equal-diameter metal outer tube 11 and are conveniently connected with an outer pipeline through loose joints. The outside of the equal diameter metal outer pipe 11 is welded with the leading-out wire fixing seat 13, the valve rod fixing seat 14, the rectifier tube fixing seat 12 and the temperature sensor mounting seat 15 in a laser welding mode. The special-shaped transducer structural member 22 is installed at two ends of the inner side of the equal-diameter metal outer tube 11, and the deflector cap 23 is installed on the special-shaped transducer structural member 22 finally. The inner sides of the two transducer structural members 22 are butted with convex-concave butting parts (40) of necking rectifying tubes 31 and 32 respectively, and are positioned and then welded into a whole by laser, namely, the integral lining can be divided into two parts, and a valve ball 33 can be arranged in the middle of the lining.

Valve ball and accessory installation operation process: in the groove 312 between the narrowed rectifying tubes 31 and 32, a rubber ring 39 and a polytetrafluoroethylene pad 35 are sequentially placed. Then, the valve ball rotation positioning pin 34 is placed in the special-shaped positioning groove 323, note that, as shown in fig. 4, the linear positioning pin 34 should be placed along the flow channel direction, the groove at the lower part of the valve ball 33 is aligned with the linear positioning pin 34, the valve ball 33 is pushed into the necking rectifier tube 32, so that the positioning pin 34 is embedded in the groove at the lower part of the valve ball 33, then the necking rectifier tubes 31 and 32 are butted, the inward turned edge 361 of the two-part symmetrical cylindrical valve ball metal clasping button 36 is clasped in the groove 322 at the outer sides of the necking rectifier tubes 31 and 32, the width of the groove 322 is consistent with the metal thickness of the cylindrical valve ball metal clasping button 36, and the assembly of the valve ball and the fixing member is completed through tight fit.

After the valve ball is assembled, as shown in fig. 2, the cylindrical valve ball metal clasper 36 clasps and positions the middle parts of the necked rectifying tubes 31 and 32 according to the above-mentioned process, and forms a lining tube connector under the cooperation of the profiled transducer structural member 22 and the necked rectifying tubes 31 and 32. The inside lining connector is together with sealing washer 3111 in the necking down rectifier tube outer lane recess 311, inserts the isodiametric metal outer tube 11, and rubber ring 3111 plays and blocks water and the tight fit effect to necking down rectifier tube and metal outer tube inboard. Thus, a lining whole body is formed in the metal outer pipe 11, and the installation of the lining valve control pipe body structure of the correlation type transducer is completed.

The valve ball at the lower part of the valve rod jack 321 of the necking rectifier tube 32 is opened and closed to stop the injection molding part of the special-shaped positioning groove 323, and the injection molding part is formed as follows: the plastic mold is formed by drawing the irregular positioning groove 323 from the upper part through the valve stem insertion hole 321 of the necking rectifying tube 32, and the inner part is formed by drawing the inner hole of the necking rectifying tube 32 left and right.

The length 221 of the lining valve control tube body structure of the correlation type transducer is 0.3mm less than that of a single side of the equal-diameter metal outer tube, and the length 221 of the lining valve control tube body structure of the correlation type transducer has the effect that when the loose joint of the flowmeter is installed, extrusion force borne by the sealing rubber gasket is mainly borne by the metal tube opening of the butt joint port, so that the lining tube can be effectively protected, and the lining tube is stressed less and cannot deform in long-term use.

The positioning and fixing structure of the ball valve has the following advantages that:

(1) This application water gauge flow meter is with embedded valve ball opening, close accurate positioning structure includes, and valve ball straight line rotates locating pin 34, special-shaped positioning groove 323, valve ball 33 and necking down rectifier 32 and gathers tetrafluoro pad 35 and O type sealing washer 39, embraces at the tube-shape valve ball metal of two parts symmetry and detains 36 and detain under the cooperation in the recess 322 in the necking down rectifier 31 and the 32 outside, has formed an ultrasonic wave straight tube valve accuse water gauge flow meter is with embedded valve ball opening, close accurate positioning structure. The structure can ensure that the axes of the valve ball through hole and the flow passage through hole are overlapped when the valve is opened, and the substantial structural improvement has the special advantages of solving the problems that the existing ball valve is not closed in place and the ball valve leaks; the ultrasonic signal transmitting and receiving amplitude intensity is influenced due to the fact that the ultrasonic signal is not opened in place, and time difference calculation is further influenced; further, the flow velocity change of the water flow generated by the misalignment of the valve ball through hole and the flow passage through hole directly changes the originally set flow state of the flowmeter, thereby causing the fatal defects of abnormal metering or serious deviation of precision.

(2) Polytetrafluoroethylene ring gaskets 35 and O-shaped sealing rings 39 are arranged on two sides of the valve ball: o-ring seal 39 provides sealing and resiliency; the ptfe gasket 35 provides the proper sealing grip and low coefficient of friction of the valve ball, which in combination forms a low coefficient of friction water tight structure for the valve ball.

(3) As shown in FIG. 4, the metal clasping button 36 for cylindrical valve ball is characterized in that the necking rectifiers 31 and 32 are not affected by external pressure and pulling force to cause the change of the force for pressing the valve ball, thereby ensuring that the driving force of the valve ball does not change according to the set value. The gripping force experienced by the valve ball is determined primarily by the amount of compression provided by the O-ring seal 39. According to the standard of a valve sealing ring, the compression amount of the unilateral sealing ring 39 is adjusted and controlled to be controlled between 0.2 mm and 0.5mm by referring to the driving force designed by a speed reducing motor, so that the water tightness of a ball body and the low friction driving resistance of the valve ball in rotation are completely ensured.

(4) Because the accessories are produced in a standardized way, the clasping force borne by the valve ball is constant during batch production, and the reason is that the cylindrical valve ball metal clasping button 36 is clamped in the close-fitting thin grooves 322 of the necking rectifier tubes 31 and 32, and a very stable valve body structure is formed under the wrapping of the metal outer tube 11.

(5) The valve ball rotation positioning pin 34 is in tight fit with the corresponding positioning groove in the valve ball 33, no gap exists, the rotation positioning pin 34 is arranged in the positioning pin special-shaped positioning groove 323 in the necking rectifying tube 32, and the structure can limit the valve ball rotation positioning pin 34 to rotate by 90 degrees forwards and backwards to stop positioning, so that the valve ball opening is effectively guaranteed to be accurate, and the metering characteristic of flow meter fluid is not influenced by the valve ball opening deviation caused by the position fixing deviation and the rotation positioning deviation of the speed reducing motor.

(6) The fixing mode of the valve ball is different from the mode that the valve ball in the patent grant publication No. CN 211317424U is in butt joint and fixing by the seam of two lining pipes, and the valve ball 33 is arranged in the necking rectifier pipe 32 on one side, so that the condition that when a gap is formed between the valve ball and an outer pipe, the butt joint part of the two lining pipes is uneven (inclined), and the valve ball is pressed unevenly to cause liquid leakage is avoided.

The valve ball 33 has a small rotation resistance due to the teflon pad 35. The valve ball in patent grant publication No. CN 211317424U only has a sealing ring, and the structure has relatively large rotating friction force, poor durability of the friction sealing ring and leakage risk.

The rectifier tube positioning nut 121 and the sealing ring 122 are located in the rectifier tube fixing seat 12, and the protruding portions of the rectifier tube positioning nut and the sealing ring extend into the corresponding blind holes of the rectifier tubes 31 and 32 to position and fix the rectifier tubes 31 and 32.

The valve ball driving shaft 37 and the sealing ring 371 are inserted into the driving groove of the valve ball from the hole of the valve rod fixing seat 14 to be butted, and then the speed reducing motor 41 is installed in the lower shell 55A of the instrument circuit box to complete the installation of the electric control valve.

The special-shaped transducer structural part 22 is provided with a blind hole, a ceramic sheet assembly 24 is packaged in the blind hole, a leading-out wire 28 is welded, the guide cap 23 is not installed at the moment, the integral inner bushing is inserted into the metal tube 11, and the transducer leading-out wire 28 penetrates out of the leading-out wire fixing head 25 through the leading-out wire inclined hole 222. After that, the deflector cap 23 is buckled, and the installation of the transducer and the leading-out of the leading-out wire are completed. Furthermore, a flat-head thin needle tube is used for filling the two-component A, B glue into the transducer through the middle hole of the leading-out wire fixing head 25 and the leading-out wire inclined hole 222 so that the special-shaped transducer structural member 22 and the transducer guide cap 23 are tightly combined into a whole, and the end of the guide cap 23 is provided with a circle of groove 231 which is used for participating in the fastening connection of A, B glue.

The leading-out wire fixing head 25 is positioned at the lower part of the through hole of the leading-out wire fixing seat 13 and is positioned by the positioning table 131, and the function of the positioning table is as follows: firstly, the lower convex position is embedded into the groove of the transducer structural member 22, and the wire outlet of the special-shaped transducer structural member 22 is positioned and fixed; secondly, since the lead wire fixing head 25 has a positioning table, the compression amount of the sealing ring 251 by the lead wire fixing head can be constant. That is, further, a seal ring 251 below the lead wire fixing head 25 is used to seal the transducer structure 22; the seal ring 252 seals the inside of the lead wire fixing base 13.

The lead wire fixing head 25 is positioned by the positioning surface 131, over which the elastic washer 26 is placed, and the lead wire fixing cap 27 is placed over the elastic washer 26, and functions to press the elastic washer 26 with a constant force to fix the lead wire fixing head 25.

The transducer lead 28 is led out from the ceramic chip assembly 24 through the inclined hole 222, and through the lead fixing head 25, the spring washer 26 and the lead fixing nut 27 to the integrated circuit board 551 in the meter circuit box 55.

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, the meter display screen 552, the speed reducing motor 41 and the battery 553 are positioned in the meter circuit box. The center of the lead-out wire fixing nut 27 is provided with a hexagonal screw hole, and the lead-out wire fixing nut 27 can be screwed through the hexagonal screw hole so as to compress and fix the lower box 55A of the instrument circuit box.

The instrument circuit box lower casing 55A and the outer ring of the transducer outgoing line fixing seat 13 are matched in a cylindrical shape, and a sealing ring 132 is arranged between the two for sealing. The lead wire fixing nut 27 has two functions: firstly, the transducer lead-out wire fixing head 25 is pressed tightly by applying force to an elastic gasket 26; and the other is for pressing the lower case 55A of the instrument case, so that the fixation of the lower case 55A of the instrument case is accomplished by applying an extremely simple method. 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.

Rectifier tube fixing base 12 and valve rod fixing base 14 are located 11 outer end both sides of equal footpath metal outer tube respectively, and hold-down screw 121 and sealing washer 122 are located rectifier tube fixing base 12 for location, fixed necking down rectifier tube 31, 32. The valve driving rod 37 and the sealing ring 371 are arranged in the valve rod fixing seat 14, one end of the valve driving rod is in butt joint with the valve ball groove, and the other end of the valve driving rod is in butt joint with the speed reducing motor 41.

The fixing of the integral pipe of the inner pipe of the flowmeter is as follows: the upper part is pressed and fixed from both ends by two leading-out wire fixing heads 13, and the lower part is pressed and fixed in the middle by two necking rectifier tube pressing screw rods 121, so that a stable fixed integral structure is formed.

The fixing nut protective shell 55C is connected with the bayonet of the lower box hole 55A1 of the instrument circuit box and used for protecting the rectifier tube fixing nut 121.

For the metering requirement of the embodiment for hot water, the temperature sensor 151 is greatly convenient to arrange because the integral lining and the metal outer pipe body 11 of the flowmeter do not need to be integrally waterproof at two ends. Temperature sensor mount pad 15 is located the outer end of equal diameter metal outer tube 11, and temperature sensor 151 installs in temperature sensor mount pad 15, and the temperature measurement pole can pass the inside lining and insert in the outside of transducer water conservancy diversion cap 23 to one side and need not do special waterproofly, has accomplished the temperature measurement and has not influenced the flow measurement characteristic.

The present invention has been described above by way of example with reference to a valve-controlled hot water meter, but the present invention is not limited to the above-described embodiments, and any changes or modifications made based on the present invention are within the scope of the present invention as claimed.

Claims (13)

1. An embedded valve ball positioning structure adaptive to an ultrasonic valve-controlled water meter is characterized by comprising an equal-diameter metal outer tube (11) of a flowmeter base meter, a special-shaped transducer, a valve ball (33), a valve ball rotating positioning pin (34), necking rectifier tubes (31) and (32), a cylindrical valve ball metal clasp (36), a transducer outgoing line fixing seat (13), a valve rod fixing seat (14), a rectifier tube fixing seat (12), a water meter circuit box (55) and an outgoing line fixing cap (25); the embedded valve control positioning structure for the water meter flowmeter is characterized in that a base meter outer pipe is an equal-diameter metal outer pipe (11); the special-shaped transducer consists of a special-shaped transducer structural part (22) and a transducer deflector cap (23), and is arranged at two ends of the inner side of the equal-diameter metal outer pipe (11); the middle part of the valve ball (33) is provided with a through hole, the upper part of the valve ball is inserted with a rotary driving rod (37), and the lower part of the valve ball is embedded with a valve ball positioning pin (34); the valve ball rotating positioning pin (34) is arranged in a positioning pin special-shaped positioning groove (323) in the necking rectifying tube and is limited to rotate and stop at a positive angle and a negative angle of 90 degrees; the necking rectifier tubes (31) and (32) are composed of two asymmetric sections, and the valve ball is wrapped and fixed through a cylindrical valve ball metal clasp (36) and a polytetrafluoroethylene ring gasket (35); the two transducer structural parts (22) are respectively glued or welded with the two reducing rectifier tubes (31) and (32) by laser, and then positioned, wrapped and fixed by a cylindrical valve ball metal clasp (36) to form an integral lining structure; under the cooperation of an isometric metal outer pipe (11) serving as a central framework, a transducer leading-out wire fixing seat (13), a valve rod fixing seat (14), a rectifier tube fixing seat (12), a water meter circuit box (55) and a leading-out wire fixing cap (25), an embedded valve ball positioning structure adaptive to the ultrasonic valve control water meter is formed, and the accurate positioning targets of opening and closing of a ball valve are achieved while the constant water meter metering accuracy characteristic, the maximized metering range ratio and the minimized initial flow are guaranteed.

2. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as claimed in claim 1, is characterized in that: for a small-caliber ultrasonic flowmeter base meter with limited length, two built-in special-shaped transducer structural parts (22) are arranged close to two ends of the inner side of a straight metal pipe (11) with equal diameter by changing a lead-out wire and a sealing structure of a built-in special-shaped transducer; because the leading-out wire (28) can be led out through the leading-out wire inclined hole (222), the special-shaped transducer structural part (22) can be installed close to the inner sides of the two ends of the equal-diameter metal outer pipe (11) as much as possible without considering the influence caused by position dislocation formed by the fact that the transducer leading-out wire fixing seat (13) is located on the inner side of the pipe thread, therefore, the distance between the transmitting surfaces of the two transducers can be effectively increased as much as possible, namely, the sound path is increased, the range ratio R is improved, and the purposes of range ratio maximization and initial flow minimization are achieved.

3. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as claimed in claim 1, is characterized in that: the front part of the special-shaped transducer is provided with a flow guide cover (23), the main body of the special-shaped transducer is a transducer structural member (22), and the transducer ceramic plate assembly (24) is assembled in a blind hole in the middle of the transducer structural member (22); the middle part of the special-shaped transducer structural part (22) is connected with the inner side of the outer ring through an upper support column (223) and a lower support column (224) respectively; the inner hole of the upper support column (223) is a transducer outgoing line inclined hole (222), one end of the inner hole is communicated with the inside of the transducer, and the other end of the inner hole is communicated with a central through hole of a transducer outgoing line fixing head (25); the transducer leading-out wire (28) is led out from the middle inner part of the transducer through a leading-out wire inclined hole (222) and a leading-out wire fixing head (25) central hole; after the leading-out wire (28) of the transducer is led out from the center hole of the leading-out wire fixing head (25) of the transducer, the air guide sleeve (23) is buckled, high-strength two-component A, B glue is injected into the transducer from the center hole of the leading-out wire fixing head (25) through the inclined hole (222), and the inner cavity of the transducer is filled, cured and waterproof.

4. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: because the middle part of the special-shaped transducer structural part (22) is provided with the gap of the transducer part and the cross section area for passing fluid is the minimum, 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 (223) and a lower support column (224) instead of a plurality of support columns; in addition, by changing the leading-out wire and the sealing structure of the built-in special-shaped transducer, the minimum water flow gap in the DN 15-caliber straight-through pipe can be ensured to be more than 3mm, and the safe passing of impurities is facilitated; the characteristics reduce the water flow blockage, increase the cross-sectional area of water, reduce the pressure loss and ensure the safe passing of impurities in water.

5. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as claimed in claim 1, is characterized in that: a rubber ring (39) and a polytetrafluoroethylene ring pad (35) are sequentially placed in a groove (312) between the necking rectifying tubes (31) and (32); then, a valve ball rotation positioning pin (34) is placed in a special-shaped positioning groove (323), the straight positioning pin (34) is placed along the flow channel direction, the groove at the lower part of the valve ball (33) is aligned with the straight positioning pin (34), the valve ball (33) is pushed into a necking rectifying tube (32), the positioning pin (34) is embedded in the groove at the lower part of the valve ball (33), the valve ball rotation positioning pin (34) is tightly matched with the corresponding positioning groove on the valve ball (33), and no gap exists; and finally, butting the necking rectifier tubes (31) and (32), buckling the inward-turned edges (361) of the two symmetrical cylindrical valve ball metal clasping buckles (36) in the grooves (322) on the outer sides of the necking rectifier tubes (31) and (32), wherein the width of the groove (322) is consistent with the metal thickness of the cylindrical valve ball metal clasping buckle (36), and completing the assembly of the valve ball and the fixing piece thereof by tight fit.

6. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the outer pipe of the flowmeter base meter is an equal-diameter metal outer pipe (11), pipe threads (111) are arranged on the outer sides of two ends of the equal-diameter metal outer pipe, and the equal-diameter metal outer pipe is conveniently connected with an outer pipeline of the flow to be measured through a loose joint; outside the equal diameter metal outer tube (11), welding lead-out wire fixing seat (13), valve rod fixing seat (14), rectifier tube fixing seat (12) and temperature sensor mounting seat (15) in a laser welding mode.

7. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: valve ball (33) install in necking down rectifier tube (32) of one side, when having avoided interior bushing pipe and outer tube inboard gapped, two interior bushing pipe butt joints can be uneven (crooked), cause the condition that different positions pressurized on the valve ball is uneven so that lead to the liquid seepage.

8. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the necking down rectifier tubes (31) and (32) are positioned in an up-down matching way and are in hard contact with the side surfaces of the tubes, and then are positioned and fastened by a cylindrical valve ball metal clasping device (36), and the cylindrical valve ball metal clasping device is characterized in that the necking down rectifier tubes (31) and (32) are prevented from being changed by the force of pressing the valve ball due to external pressure and pulling force, so that the driving force of the valve ball is ensured to follow a set value; the holding force of the valve ball is mainly determined by the compression amount provided by the O-shaped sealing ring (39), and according to the standard of the valve sealing ring and the driving force designed by referring to the speed reducing motor, the compression amount of the unilateral sealing ring (39) can be controlled between 0.2 and 0.5mm, so that the water tightness of the ball body and the rotational friction resistance of the valve ball are completely ensured.

9. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: fixing the integral lining pipe of the flowmeter: the upper part is pressed and fixed from two ends of the tube by two outgoing line fixing heads (13); the lower part of the rectifying tube is pressed and fixed in the middle by two necking rectifying tube fixing bolts (121) to form a stable fixing whole.

10. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the two necking rectifying tubes (31) and (32) are connected with the transducer structural parts (22) at the two corresponding ends in an adhesive mode or a laser welding mode at a joint to form a section of lining tube body integral structure, one purpose of the structure is to ensure that the process that fluid enters the rectifying tubes from the port of the base surface equal-diameter metal outer tube (11) through the diversion cap (23) is continuous and smooth, and the middle lining tube wall has no break, so that the fluid flow characteristic is stable; the second purpose is to ensure the distance between the transmitting surfaces of the two transducers to be consistent during batch production, thereby achieving the consistency of the parameters of the flowmeter, improving the metering precision and greatly facilitating the detection and calibration of the flowmeter.

11. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the length (221) 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 equal-diameter metal outer pipe (11), and the length is used for effectively protecting the lining pipe, so that the lining pipe is stressed less and cannot deform in long-term use.

12. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the transducer leading-out wire fixing head (25) is highly positioned through a positioning table (131) in the leading-out wire fixing seat, so that a sealing ring (251) at the lower end of the leading-out wire fixing head is reasonably compressed, the lower part of the leading-out wire fixing head can be embedded into a special-shaped transducer structural member (22), and the functions of positioning and fixing the special-shaped transducer structural member are achieved.

13. The embedded valve ball positioning structure adaptive to the ultrasonic valve-controlled water meter, as recited in claim 1, is characterized in that: the inner lining of the small-caliber ultrasonic valve-controlled water meter is not integrally sealed with the inner side of the metal outer pipe (11), so that the temperature sensor seat (15) and the temperature sensor (151) are convenient to install and can be used for heat energy metering.

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