CN211602049U - Fixing and mounting structure for lining type ultrasonic flowmeter - Google Patents

Abstract

The utility model relates to a bushing type ultrasonic flowmeter uses fixed mounting structure, including casing and mated transducer, the casing includes outer tube and inside lining, the outer tube suit is in the inside lining outside, be provided with the transducer mounting hole that is used for installing the transducer on the inside lining. The inner lining is fixed by clamping flanges at two ends, local flanges (pressure rings) at two sides or one side are movable and can be connected with the fixed flange by an external thread or by a laser welding fixing method, and the reliability is high.

Description

Fixing and mounting structure for lining type ultrasonic flowmeter

Technical Field

The utility model particularly relates to a flow measurement equipment technical field, in particular to bushing type ultrasonic flowmeter uses fixed mounting structure.

Background

An ultrasonic flowmeter is a high-precision flowmeter which analyzes the flow velocity of a fluid by acquiring and calculating the time difference of sound waves in the fluid (liquid or gas) passing through a section of the flowing fluid so as to obtain the volume of the fluid. In 2012, with the time difference chip electronic sampling technology, the time difference extraction precision and the processing level are greatly improved, and the time difference resolution which can be calculated can reach 5 ps. As in water, the minimum flow rate that can be measured has reached 1 mm/s. In the aspect of liquid metering, an electromagnetic flowmeter is often used before, but the electromagnetic flowmeter can only measure liquid meeting certain conductivity intensity, and cannot measure liquid with too low conductivity, such as pure water and the like. In addition, electromagnetic flowmeters are also inoperable in gaseous media. The ultrasonic flowmeter measures the fluid only related to the sound velocity of the ultrasonic wave in the fluid and the time difference between two points, if the relation between the sound velocity and the temperature change of a certain fluid is brought into the software of a measuring chip, the ultrasonic flowmeter is a high-precision flowmeter which can measure the minimum initial flow, the maximum range ratio, the minimum pressure loss and the respective use of liquid and gas in all the conventional flowmeters and can measure the single-phase fluid.

However, the current ultrasonic flow meter has many disadvantages, specifically as follows:

in general, in terms of manufacturing the metal casing of the flow meter, casting or pipe section welding is adopted. The cast shell has the advantage of one-time molding, but the manufacturing process is complicated, long in time and easy to cause environmental pollution, and particularly when the sound channels are many, the manufacturing and post-processing costs are high, such as patent publication No. CN 206440316U.

The pipe section and flange connection using the welding process seems simple, as in patent application publication No. CN 106441471a, but the machining process is also complicated because the transducer mounting seat at the outer edge of the pipe body also needs to be welded, which is not easy to position and weld. Moreover, the welded transducer mount is susceptible to deformation. Theories and experiments prove that after the water-cooled water purifier is installed, because the transducer and the water flow direction have an angle, if the surfaces of the two transducers are not parallel, a small angle difference can generate a. Therefore, the transducer hole and the positioning must be precisely positioned and processed by CNC in one step, which is time-consuming, labor-consuming and high in cost.

The transducer mounting and sealing is important and for safety it is preferable to use multi-stage sealing, as in patent CN 208171354U. However, this also results in a bulky transducer mount, which takes up space and increases costs.

At present, leading-out wires of all transducers are guided into a circuit box body at the upper end of a flowmeter through special channels outside a pipe, the leading-out wires are long, a plurality of wire groups are arranged, for example, 8 wires exist in 4 channels, the length is usually close to one meter, the wires are difficult to distinguish, the wires are easy to be mistakenly picked, and meanwhile, the wires are long, the interference resistance and the safety are poor.

A liquid crystal display is typically required to read the flow meter values and its integration with the integrated circuit board limits the IP68 protection of the integrated circuit board. For example, the most reliable IP68 protection is encapsulation with A, B components of hard glue, but the glass liquid crystal screen and pins are easily damaged by expansion with heat and contraction with cold.

In the existing ultrasonic flowmeter, the irregular parts such as the mounting holes of the internal transducer cannot be subjected to corrosion prevention treatment, even if the ultrasonic flowmeter is manufactured by 316L stainless steel, the ultrasonic flowmeter can be corroded after being used in high-corrosive fluids such as seawater for a period of time, the service life is short, and the ultrasonic flowmeter cannot be used for a long time.

The length of the meter tube section is specified by the standard of the flowmeter, and the larger the projection distance of the connecting line between the transducers in the fluid flow direction is, the higher the signal-to-noise ratio of the flowmeter is, for an integrating circuit adopting the same time difference chip. I.e., the smaller the pick-up flow of the fluid that can be measured, and the larger the range of accuracy, i.e., turndown ratio, that can be measured by the meter. It can be seen that how to make the projection distance of the connecting line between a pair of transducers in the fluid flow direction not limited by the sizes of the flowmeter flange and the transducer mounting seat/hole, and to maximize the projection distance as much as possible is also an important focus of industry attention. Like patent CN 106441471a, although it is close to the flange, it cannot be completely merged with the flange or beyond the inside of the flange due to the installation and processing space limitations.

And because the transducer seat is welded on the outer side of the flowmeter pipe section, the occupied space is large, and the number of the welding seats can be extremely limited, for example, the transducer seat of 4 pairs of sound channels can be generally accommodated on the outer side of the pipe section of DN 100. The number of the pairs of transducers of the flowmeter determines the number of the measured sound channels, the sound channels are distributed in different flow layers, and the measurement accuracy is determined and directly influenced by different angles of the sound channels. Especially when the front end of the flowmeter is close to the elbow, turbulence and turbulence cause the flow field of the fluid flow velocity in the pipeline to be uneven, at the moment, the error of sampling and metering by several pairs of transducers becomes very large, and if more pairs of transducers can be installed in a limited space, the time difference and the water flow velocity can be effectively calculated from all angles of the space in the pipeline, so that the average value which is closer to the actual flow velocity is obtained, the anti-interference performance of the flowmeter is greatly improved, and the turbulence and turbulence influence brought by the elbow is solved.

In the manufacturing process of the ultrasonic flowmeter, the transducers need to be installed and positioned respectively, time and labor are wasted, and how to reduce installation parts and ensure the installation consistency of the ultrasonic flowmeter needs to be improved.

The error of the thick-wall inner diameter of the existing ultrasonic flowmeter pipe section, no matter casting or welding, is generally within the range of 0.5-3 mm, and the error can cause great flow rate difference among all measuring meters during flow measurement, so that the flow calibration and correction of each large-caliber flowmeter must be carried out on a flow identification table, and if the inner diameter error of the ultrasonic flowmeter can be smaller than 0.1mm, the efficiency can be greatly improved, and the detection and identification time can be reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem, provide the interior lining formula fixed mounting structure for ultrasonic flowmeter, solved the complicated and poor problem of waterproof myocardial infarction of inside lining and outer tube installation location.

The fixed mounting structure for the lining type ultrasonic flowmeter comprises a shell, wherein the shell comprises an outer pipe and a lining, the outer pipe is sleeved outside the lining, a transducer mounting hole for mounting a transducer is formed in the lining, and the outer pipe is fixedly connected with a pipeline through a pipeline clamp or a flange.

Preferably, the inner cavity of the outer tube is a through hole, flanges are respectively formed at two ends of the outer tube, and a first step is formed on the inner side of the flange at one end of the outer tube; a limiting groove is formed in the first step, a limiting protrusion is formed on the lining, and the limiting protrusion is inserted into the limiting groove to limit the lining to rotate relative to the first step.

Preferably, the other end of the outer pipe limits the movement of the lining in the axial direction of the lining through the fixation of the pressing ring and the flange.

Preferably, the liner is three-section; including a first inside lining and two second inside linings, first inside lining setting is between two second inside linings, the inside lining opening sets up with the second inside lining on, first inside lining both ends are formed with the inside lining arch respectively, and the second inside lining is formed with the inside lining recess, and the inside lining arch is inserted and is restricted relative rotation between first inside lining and the second inside lining in the inside lining recess.

Preferably, the liner is divided into two sections, and the liner comprises two second liners; the transducer mounting hole is arranged on the second lining; the outer tube is divided into three sections, two outer sections and a middle section; the inner diameter of the outer section is larger than the outer diameter of the middle section; an installation step is formed between the outer section and the middle section; the two second inner liners are respectively inserted into the outer section of the outer pipe and are contacted with the mounting steps; the movement of the two second liners in the axial direction of the second liners is restricted by the fixing of the pressing ring and the flange.

Preferably, a mounting nut is arranged on the surface of the second lining, which is in contact with the mounting step; the mounting nut is matched with a mounting screw penetrating through the mounting step; the mounting screw is used for limiting relative rotation between the second inner liner and the outer pipe.

Preferably, the outer pipe is fixedly connected with the pipeline through a pipeline clamp; the outer tube is formed with the outer tube hole, be formed with the inside lining opening on the inside lining, the nut has been placed in the inside lining opening, inside lining opening and nut looks adaptation and restriction nut rotate, and the screw passes outer tube hole and nut threaded connection fixes inside lining and outer tube.

Preferably, the pressure ring is bonded, screwed or welded to the flange.

The utility model has the advantages of as follows: the outer pipe is not required to be cast, and only thin-wall steel pipes (common steel pipes or stainless steel pipes which are formed by processing through plate coiled pipe welding seams are adopted, the thickness can be selected, for example, the thickness of DN50 is 1.5mm, the thickness of DN400 is 5mm, and the mode of welding the pipe section and the flange is applied to direct drinking water engineering in a large batch) and is welded with the flange (argon arc welding or laser welding); the transducer mounting seat like the patent CN 106441471A is not arranged outside the pipe section, a plurality of groups of transducers are directly packaged/inserted in the transducer mounting holes, all the transducers can be sealed by sealing the outer pipe and the lining once, the structure is simple, and the installation is convenient; besides the display, the main integrated circuit board is also packaged/embedded on the upper part of the tube lining (except for a mode of separating two sections of lining), so that the leading-out wire of the transducer can be conveniently distinguished and welded nearby, the identification is easy, the wire length is reduced, and the anti-interference performance is improved. Moreover, no matter how many pairs of transducers and connecting wires are installed, the final output wire only has one four-core wire, namely a positive power line, a negative power line and a pair of data lines; because the core totalization circuit board is arranged in the pipeline and is packaged by A, B glue, the protection level is higher, and only a liquid crystal display screen, a battery and wired/wireless remote transmission output are arranged in the peripheral circuit box; the lining is fixed by clamping flanges at two ends in the middle, local flanges (pressure rings) at two sides are movable and are connected and fixed by an external wire and a fixed flange or by a laser welding method, the reliability is high, the upper part and the side surface of the lining are provided with sealing rings, and all leading-out wires of the transducer are connected to an integrating circuit board in a dry environment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawing in the following description is only an embodiment of the invention, and that for a person skilled in the art, other embodiments can be derived from the drawing provided without inventive effort.

FIG. 1: the embodiment of the utility model provides a main view sectional structure sketch map of ultrasonic flowmeter 1;

FIG. 2: the utility model discloses embodiment 1's front view sectional structure sketch map;

FIG. 3: the utility model is a schematic sectional structure along A;

FIG. 4: the structure of the lining in embodiment 1 of the utility model is schematically shown;

FIG. 5: the utility model discloses embodiment 1 pipeline clamp's structural sketch map;

FIG. 6: the utility model discloses embodiment 2's front view sectional structure sketch map;

FIG. 7: the utility model is a schematic sectional structure along the section B;

FIG. 8: the utility model discloses embodiment 2 three-dimensional structure sketch map;

FIG. 9: the utility model has a partial enlarged structure schematic diagram at the E position;

FIG. 10: the structure schematic diagram of the transducer shell of the utility model;

FIG. 11: the structure schematic diagram of the transducer compact block of the utility model;

FIG. 12: the utility model discloses an explosion diagram of an integrally packaged transducer;

FIG. 13: the utility model discloses a schematic diagram of a cross-sectional structure of an integrally packaged transducer;

FIG. 14: the utility model discloses embodiment 3's front view sectional structure sketch map;

FIG. 15: the utility model is a schematic cross-sectional structure along C section;

FIG. 16: the utility model discloses embodiment 3's three-dimensional structure sketch map;

FIG. 17: the utility model is a schematic sectional structure diagram cut along D;

FIG. 18: the utility model discloses embodiment 3 structural schematic of inside lining.

Detailed Description

The invention will be further described with reference to the following figures and examples:

reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The fixing and mounting structure for a liner type ultrasonic flowmeter of the present embodiment is, as shown in fig. 1 to 5, a liner 2 having a three-stage structure, and including a first liner 21 and two second liners 22, where the first liner 21 is disposed between the two second liners 22, and the two second liners 22 are symmetrical to each other on both sides of the first liner 21; the transducer mounting hole 221 is disposed on the second liner 22; the outer wall of the lining 2 is provided with a mounting groove 211 for mounting the integrating circuit board 3; the mounting groove 211 is formed on the outer wall of the first liner 21 or the second liner 22, and the mounting groove 211 is preferably formed on the first liner 21. The outer tube 1 is formed with a connecting hole 1a, and the connecting hole 1a is used for an output line 31 between the gauge outfit 4 and the integrating circuit board 3 to pass through; the gauge outfit 4 is arranged outside the outer tube 1, and the output line 31 passes through the connecting hole 1a to connect the integrating circuit board 3 and the gauge outfit 4.

The advantage of this design is that only the second liner 22 with the transducer mounting holes 221 needs to be made of a higher priced material for acoustic impedance matching, such as PPS, PSU or PEEK, and the first liner 21 can be made of a lower priced material, which saves costs; meanwhile, compared with the integrated liner 2, the single first liner 21 and the single second liner 22 are small in size, so that the production and demolding are facilitated;

the second inner liner 22 and the outer pipe 1 are sealed with a first gasket 11, and the second inner liner 22 and the first inner liner 21 are sealed with a second gasket 12.

As shown in fig. 1, the outer tube 1 is formed with an outer tube hole 1b, the second liner 22 is formed with a liner opening 223, a nut 71 is placed in the liner opening 223, and the liner opening 223 is fitted with the nut 71 and restricts the rotation of the nut 71. The screw 72 is screwed with the nut 71 through the outer pipe hole 1b to fix the second liner 22 to the outer pipe 1. The outer tube hole 1b can be a threaded hole or a unthreaded hole, and is matched with a threaded section or a polished section of the screw 72, and the unthreaded hole or the thread of the outer tube hole 1b is coated with thread sealant to increase the protection grade.

The first liner 21 has two ends respectively formed with liner protrusions 214, the second liner 22 has liner grooves 224, the liner protrusions 214 are inserted into the liner grooves 224 to limit the relative rotation between the first liner 21 and the second liner 22, so the second liners 22 at two ends will not rotate relative to the first liner 21. The second liner 22, both ends of which are fixed to the outer pipe 1, restricts the axial movement of the first liner 21, so that the relative position between the first liner 21 and the second liner 22 is fixed.

Preferably, the sealing ring 73 is sleeved on the outer side of the outer tube 1, the screw 72 is arranged in the sealing ring 73, and the sealing ring 73 is fixed with the outer tube 1 by welding to isolate the screw 72 from the outside.

As shown in fig. 1 and 2, an installation groove 211 is formed outside the first liner 21, a connection hole 1a is formed in the outer tube 1, the connection hole 1a is located above the installation groove 211, the integrated circuit board 3 is installed in the installation groove 211, the integrated circuit board 3 is electrically connected to the output line 31, and the output line 31 passes through the connection hole 1 a. The gauge outfit 4 is installed outside the outer tube 1, the display 41 is installed in the gauge outfit 4, the gauge outfit 4 is communicated with the installation groove 211 through the connection hole 1a, and the output line 31 enters the gauge outfit 4 and is electrically connected with the display. The totalizing circuit board 3 is encapsulated in the mounting groove 211 by using A, B-component hard glue, and the display 41 is sealed by using parylene nano-plating, so that A, B-component hard glue is prevented from damaging the display 41.

The transducer 8 is directly packaged/installed in the transducer mounting hole 221 on the liner 2, and besides the liquid crystal display 41, the integrated circuit board 3 is also packaged/embedded on the upper portion of the liner 2, so that the outgoing lines of different transducers 8 can be distinguished conveniently, the outgoing lines of the transducer 8 can be welded nearby, and the line length of the outgoing lines is reduced. Furthermore, the final output line 31 has only one quad line (i.e., a positive and negative power line and a pair of data lines) regardless of how many pairs of transducers and lead lines are mounted. Because the core totalizing circuit board is arranged in the pipeline and is packaged by A, B glue, the protection level is higher, and only the liquid crystal display screen 41, the battery and the wired/wireless remote transmission output module are arranged in the peripheral circuit box. The distance from the outgoing line of the transducer 8 to the integrating circuit board 3 is shortest, the outgoing lines run along the same path, the identification and the connection are very easy, the integrating circuit board 3 is also easy to use A, B glue to carry out the whole packaging protection, and thus, an external protective line connecting pipe for running the outgoing line, which is designed by other similar ultrasonic flow meters, is omitted. The arrangement of the wire grooves effectively solves the problems of multiple and complicated data lines of the ultrasonic transducers, and the outgoing line of each transducer 8 is fixed in the wire groove, so that the installation and the arrangement are convenient; meanwhile, the arrangement of the wire groove can enable the lining 2 and the outer pipe 1 to be tightly attached, and sealing of the first sealing ring 11 is facilitated.

As shown in fig. 3, fig. 3 takes the form of a mounted transducer 8. The transducer mounting hole 221 is a blind hole, a transducer front adhesive layer 81, a transducer ceramic plate 82 and a transducer circuit board 83 are sequentially arranged inside the transducer mounting hole 221 from inside to outside, one end of the transducer front adhesive layer 81 is fixedly connected with the bottom surface of the transducer mounting hole 221, and the other end of the transducer front adhesive layer is fixedly connected with the transducer ceramic plate 82. The transducer ceramic plate 82 is glued and electrically connected to the transducer circuit board 83. Preferably, the inner wall of the second liner 22 is formed with a conduction hole 225, the transducer mounting hole 221 and the conduction hole 225 are on one axis, and the bottom surfaces of the transducer mounting hole 221 and the conduction hole 225 are parallel, so as to prevent the sound wave emitted by the transducer 8 from being affected by the plastic layer of the second liner 22 with uneven thickness, which results in the accuracy reduction of the flowmeter.

As shown in fig. 3 and 4, a slot is formed on the outer side of the liner 2, the slot connects the transducer mounting hole 221 with the mounting groove 211, and the leading-out wire of the transducer circuit board 83 is in the slot and enters the mounting groove 221 along the slot to be electrically connected with the integrating circuit board 3.

The wire groove may be a curve from the transducer mounting hole 221 to the mounting groove 211. Assuming that the circumferential surface of the liner 2 is spread out into a rectangular plane, the slot is a straight line from the transducer mounting hole 221 to the mounting groove 211 in this rectangular plane. The wire groove of this type has the shortest distance from the transducer mounting hole 221 to the mounting groove 211, and the shortest length of the lead wire used, but the processing cost is high. If the liner 2 is integrated, the wire groove is an integrated groove; if the lining 2 is divided into a plurality of sections at the position of the wire groove, the wire groove is formed by splicing a plurality of grooves, and the shape and the route of the spliced wire groove are the same as those of the wire groove of the inner side 2 of the integrated type.

The trunking may also be in the form of a busway trunking and a circumferential trunking 212. As shown in fig. 3, the outgoing line extending from the transducer mounting hole 221 is routed along the bus line slot first, and when the outgoing line reaches the circumferential line slot 212, the outgoing line turns to be routed along the circumferential line slot 212 to the mounting slot 211 until the outgoing line enters the mounting slot 211 to be electrically connected with the integrated circuit board 3. When the liner 2 is segmented, the busway slots include a second busway slot 222 formed on the second liner 22 and a first busway slot 213 formed on the first liner 21. The distance from the transducer mounting hole 221 to the mounting groove 211 of the wire groove in the mode is long, the length of the used lead wire is long, and the processing cost of the wire groove is low. When the liner 2 is unitary, the first busway slot 213 and the second busway slot 222 comprise a unitary busway slot.

As shown in fig. 2 and 5, the outer pipe 1 is connected to the pipe by a pipe clamp 5. The scheme has no strict limitation on the length of the pipeline, a section of the pipeline with the same length as the flowmeter is cut and removed from the pipeline, and then the pipeline section of the flowmeter and the pipeline section are connected by the pipeline clamp 5 in a fastening and sealing way, so that the operation is convenient. For the flowmeter, the mode can be directly installed in a narrow space and on an already laid pipeline. The installation can be convenient as long as a section of pipeline is cut off, and the cost reduction range is large.

The pipe clamp 5 comprises an outer layer 51, the outer layer 51 is formed with a break-away gap, and the outer layer 51 is C-shaped. The slide rail 53 is in the gap, and both ends are connected with the outer layer 51 in a sliding manner. The outer layer 51 is formed with the fixed block 52 on both sides of the breach, and the fixed block 52 is formed with the screw hole. The bolts 55 sequentially penetrate through the two fixing blocks 52 and are in threaded connection with both the fixing blocks 52. The outer layer 51 is tightened and deformed by rotating the bolt 55, and the cross-sectional area inside the outer layer 51 is reduced. The outer layer 51 has two ends with fastening teeth 511 for fastening the pipe section and a middle rubber sealing layer 512 for sealing.

The outer pipe 1 of the present embodiment may be fixed to the pipe by a conventional connection form such as flange connection.

Example 2

In the fixing and mounting structure for a liner type ultrasonic flowmeter according to the present embodiment, as shown in fig. 6 to 13, the liner 2 is integrally formed; the inner liner 2 is sleeved in the outer pipe 1; the inner liner 2 and the outer pipe 1 are sealed by a first sealing ring 11.

The outer wall of the lining 2 is provided with a wire groove, and the leading-out wire of the energy converter 8 is arranged in the wire groove and is electrically connected with the integrating circuit board 3 through the wire groove. An installation groove 211 for installing the totality circuit board 3 is arranged on the outer wall of the inner liner 2, and after the assembly, the totality circuit board 3 is positioned between the inner liner 2 and the outer tube 1. The outer tube 1 is formed with a connecting hole 1a, and the connecting hole 1a is used for an output line 31 between the gauge outfit 4 and the integrating circuit board 3 to pass through; the gauge outfit 4 is arranged outside the outer tube 1, and the output line 31 passes through the connecting hole 1a to connect the integrating circuit board 3 and the gauge outfit 4. The display 41 is installed in the meter head 4, the accumulation circuit board 3 is encapsulated in the installation groove 211 by using A, B-component hard glue, and the display 41 is sealed by using parylene nano-plating. Other structures in the gauge head such as a battery and a wired/wireless remote transmission output structure belong to the conventional design in the field and are not shown one by one. The integrated liner 2 of the present embodiment is easy to mount, and the accuracy such as the coaxiality of the corresponding transducer mounting holes 221 is high. But because an acoustic impedance matching material such as PPS, PSU or PEEK is used throughout the liner 2, the cost is relatively high.

As shown in fig. 7, an inner cavity of the outer tube 1 is a through hole, flanges 10 are respectively formed at two ends of the outer tube 1, and a first step 101 is formed inside the flange 10 at one end of the outer tube 1; the first step 101 is formed with a limiting groove 112, the liner 2 is formed with a limiting protrusion 226, and the limiting protrusion 226 is inserted into the limiting groove 112 to limit the rotation of the liner 2 relative to the first step 101. The other end of the outer pipe 1 limits the movement of the inner lining 2 in the axial direction of the inner lining 2 through the fixation of the pressing ring 13 and the flange 10. The press ring 13 can be connected with the inner thread of the outer pipe 1 or fixed with the flange 10 of the outer pipe 1 by welding. In order to limit the position of the pressure ring 13, a second step 102 is provided on the flange 10.

The inboard of the flange 10 at outer tube 1 both ends can all be formed with second step 102, and inside lining 2 inserts outer tube 1 back, carries on spacingly through the clamping ring 13 at both ends to inside lining 2.

The multiple groups of transducers are directly packaged/installed in the installation groove 211, except for the liquid crystal display 41, the circuit board 3 is also packaged/embedded on the upper part of the lining 2, so that leading-out wires of different transducers 8 can be distinguished conveniently, the leading-out wires of the transducers 8 can be welded nearby, and the wire length of the leading-out wires is reduced. Furthermore, the final output line 31 has only one quad line (i.e., a positive and negative power line and a pair of data lines) regardless of how many pairs of transducers 8 and lead lines are mounted. Because the core totalizing circuit board is arranged in the pipeline and is packaged by A, B glue, the protection level is higher, and only the liquid crystal display screen 41, the battery and the wired/wireless remote transmission output module are arranged in the peripheral circuit box. The distance from the outgoing line of the transducer 8 to the integrating circuit board 3 is shortest, the outgoing lines run along the same path, the identification and the connection are very easy, the integrating circuit board 3 is also easy to use A, B glue to carry out the whole packaging protection, and thus, an external protective line connecting pipe for running the outgoing line, which is designed by other similar ultrasonic flow meters, is omitted.

As shown in fig. 7, the transducer mounting holes 221 are through holes. The transducer 8 comprises a transducer ceramic plate 82 and a transducer circuit board 83, the transducer ceramic plate 82 being glued and electrically connected to the transducer circuit board 83. The transducer 8 further comprises a transducer shell 84, a shell blind hole 84c is formed in the transducer shell 84, a limiting protrusion 84b with limited glue thickness is formed on the bottom surface of the shell blind hole 84c, the transducer ceramic plate 82 is pushed into the shell blind hole 84c after glue is injected to the bottom surface of the shell blind hole 84c until the transducer ceramic plate 82 is contacted with the blind hole protrusion 84b, only glue exists between the transducer ceramic plate 82 and the bottom surface of the shell blind hole 84c at the moment, a transducer front glue layer 81 is formed after the glue is dried, and the transducer ceramic plate 82 and the bottom surface of the shell blind hole 84c are bonded and fixed by the transducer front glue layer 81. The thickness of the transducer front glue layer 81 is the same as the height of the blind hole limiting protrusion 84 b. The transducer circuit board 83 is bonded outside the transducer ceramic plate 82, the transducer circuit board 83 also being in the housing blind hole 84 c. After the leading-out wire of the transducer circuit board 83 penetrates through the shell blind hole 84c, glue is sealed on the outer side of the transducer circuit board 83, the glue is dried to form transducer rear-sealing glue 87, the shell blind hole 84c is separated from the outside through the transducer rear-sealing glue 87, and the leading-out wire of the transducer circuit board 83 penetrates through the transducer rear-sealing glue 87. Preferably, before the transducer circuit board 83 is sealed with the adhesive, the lead-out wire is led out of the housing blind hole 84c and then led through the first lead-out hole 851 of the transducer back cover 85, then the adhesive is sealed, the transducer back cover 85 is inserted into the transducer housing 84 before the adhesive is dried, and the transducer back cover 85 is bonded and fixed with the transducer housing 84 through the transducer back adhesive 87. The transducer back cover 85 may also be secured to the transducer housing 84 by ultrasonic welding.

The transducer mounting hole 221 is formed with a step 221a, and the transducer housing 84 is formed with an enlarged portion 84 a. The transducer housing 84 is inserted into the transducer mounting hole 221 with the enlarged portion 84a contacting the step 221a, and the step 221a restricts the movement of the enlarged portion 84a toward the inside of the liner 2. The step 221a has a circular seal groove with a transducer seal ring 16 embedded therein. The transducer hold-down block 86 is arranged between the transducer housing 84 and the outer tube 1 and holds the transducer housing 84 in a hold-down position, and the hold-down spring force of the transducer seal ring 16 on the step platform (i.e., the transducer seal ring 16 is deformed to some extent). The transducer hold-down bumps 86 are fitted to the inner wall of the outer tube, and after the liner 2 is inserted into the outer tube 1, the transducer hold-down bumps 86 are fixed relative to the outer tube 1. Preferably, a positioning protrusion 863 is formed below the transducer hold-down block 86, and a positioning step 841 is formed at the transducer housing 84 and/or the transducer back cover 85, the positioning protrusion 863 being inserted into the positioning step 841 to restrict the transducer housing 84 from rotating relative to the transducer hold-down block 86. The face of the top end of transducer hold-down 86 is in mating contact with outer tube 1, thereby limiting the movement of transducer hold-down 86 relative to outer tube 1. The transducer pressing block 86 is formed with a second passing hole 861 and a wiring slot 862 (if necessary, the transducer rear cover 85 may also be formed with a slot through which a leading wire passes, and adapted to the wiring slot 862), and the leading wire of the transducer circuit board 83 sequentially passes through the first passing hole 851, the second passing hole 861 and the wiring slot 862 and then enters the wiring slot, and then enters the mounting slot 221 through the wiring slot and is electrically connected to the integrating circuit board 3. The structure and principle of the trunking of the present embodiment are the same as those of the first embodiment (when the first liner 21 and the second liner 22 are integrally formed). Preferably, a transducer seal ring 16 is provided between the enlarged portion 84a and the step 221a for waterproofing. The integral transducer 8 may be preassembled and the transducer 8 inserted directly during assembly of the flowmeter. The transducer 8 can be limited by the contact of the outer tube 1 and the step 221a with the transducer 8.

The above is but one alternative form of fixing of the transducer 8 relative to the outer tube 1 and the inner liner 2. The transducer housing 84 may also be formed with a protrusion on its own and the transducer mounting hole 221 formed with a slot that fits into it, thereby restricting rotation of the transducer housing 84 relative to the transducer mounting hole 221 while restricting movement of the transducer housing 84 into the liner 2. If the enlarged portion 84a is made of a non-rotational body (e.g., the cross section of the enlarged portion 84a changes from circular to rectangular), the above description can be satisfied. The transducer back cover 85 can directly contact the inner wall of the outer tube 1 to limit the movement of the transducer housing 84 toward the outer tube 1.

As shown in fig. 7, the outer pipe 1 is connected to the pipe by a flange 10. The transducers 8 may extend beyond the inner edge of the flange 10 so as to maximize the projected distance between a pair of transducers 8 in the direction of fluid flow.

After the liner with directional positioning is installed, the local flanges (the pressure rings 13) on one side are butted (screwed or welded at the seams directly without threads), so that the liner pipe section is completely clamped on the inner sides of the two flanges, the installation is safe and reliable, and the whole flow meter pipe section does not adopt a screw.

Example 3

As shown in fig. 14 to 18, in the fixing structure for a liner type ultrasonic flowmeter according to the present embodiment, the outer pipe 1 is fitted around the outside of the liner 2. The liner 2 comprises two second liners 22.

The outer tube 1 is divided into an outer section and a middle section, the inner diameter of the middle section is smaller than that of the outer section, two ends of the middle section are respectively connected with the outer section, and an installation step 14 is formed between the outer section and the middle section. Flanges 10 are respectively formed at two ends of the outer pipe 1, a second lining 22 is installed in the outer section, one end of the second lining 22 is in contact with the installation step 14, and the other end of the second lining is limited through a pressing ring 13. The principle of the pressure ring 13 is the same as in the embodiment. The transducer 8 is mounted in the transducer mounting hole 221 of the second liner 22. the transducer mounting hole 221 may be a blind hole or a through hole in the same manner as in the first or second embodiment. Sealing rings are arranged at the gaps between the second inner liner 22 and the two ends of the outer pipe 1.

As shown in fig. 14 and 17, the mounting step 14 is formed with an outlet hole 15. The leading-out wire of the transducer 8 passes through the second bus duct 222 and then directly passes out of the wire outlet hole 15. As shown in fig. 14, the mounting screw 75 is threaded to the mounting nut 74 through the connecting piece 76 and the mounting step 14, or the mounting screw 75 is threaded to the mounting nut 74 only through the mounting step 14, and the lower end of the mounting piece 76 is inserted into the limiting groove of the lower watch body 92, so as to limit the rotation of the lower watch body 92 relative to the outer tube 1. The mounting nut 74 fits into a slot in the second liner 22, as in the first embodiment. As shown in fig. 15, the upper watch body 91 is fixedly connected to the lower watch body 92 by screws. Preferably, the gaps between the lower surface body 92 and the upper surface body 91, the gaps between the lower surface body 92 and the outer tube 1, and the gaps between the upper surface body 91 and the outer tube 1 are sealed.

As shown in fig. 15, the display 41 is mounted on the upper surface of the upper body 91, the latch 32 is fixed to the upper body 91, and the integrated circuit board 3 is fixed to the upper body 91 by the latch 32. The outgoing line of the transducer 8 penetrates out of the wire outlet hole 15 and then is electrically connected with the integrating circuit board 3. Because the middle metal tube section of the outer tube 1 is recessed, the wires of all the transducers can pass through the wire outlet holes 15 on the wall of the mounting step 14, reach the protection cavity formed by the lower surface body 92 and the upper surface body 91 of the outer plastic, and are connected with the integrating circuit board 3. Except for omitting an external protective wire connecting pipe designed by other similar ultrasonic flow meters, the length of a lead-out wire from the transducer 8 to the integrating circuit board 3 is very short, and the wiring is convenient.

The first liner 21 and the second liner 22 of the present embodiment may be one-piece. The mounting of the transducer 8 is in the form of a mounting of the first embodiment or an integral encapsulation of the second embodiment.

The present invention has been described above by way of example, but the present invention is not limited to the above-mentioned embodiments, and any modification or variation based on the present invention is within the scope of the present invention.

Claims (8)

1. The utility model provides a bushing type ultrasonic flowmeter is with fixed mounting structure, includes the casing, its characterized in that: the casing includes outer tube (1) and inside lining (2), outer tube (1) suit is in inside lining (2) outside, be provided with transducer mounting hole (221) that are used for installing transducer (8) on inside lining (2), outer tube (1) is through pipe clamp (5) or flange and pipeline fixed connection.

2. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 1, wherein: the inner cavity of the outer pipe (1) is a through hole, flanges (10) are respectively formed at two ends of the outer pipe (1), and a first step (101) is formed on the inner side of the flange (10) at one end of the outer pipe (1); the first step (101) is provided with a limiting groove (112), the lining (2) is provided with a limiting protrusion (226), and the limiting protrusion (226) is inserted into the limiting groove (112) to limit the lining (2) to rotate relative to the first step (101).

3. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 2, wherein: the other end of the outer pipe (1) limits the movement of the lining (2) in the axial direction of the lining (2) through the fixation of the pressure ring (13) and the flange (10).

4. A fixing and mounting structure for a liner type ultrasonic flowmeter according to claim 2 or 3, wherein: the inner liner (2) is of a three-section type; the novel anti-rotation lining is characterized by comprising a first lining (21) and two second linings (22), wherein the first lining (21) is arranged between the two second linings (22), a lining opening (223) is formed in each second lining (22), lining protrusions (214) are formed at two ends of the first lining (21), lining grooves (224) are formed in the second linings (22), and the lining protrusions (214) are inserted into the lining grooves (224) to limit relative rotation between the first lining (21) and the second lining (22).

5. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 1, wherein: the inner liner (2) is divided into two sections, and the inner liner (2) comprises two second inner liners (22); the transducer mounting hole (221) is arranged on the second lining (2); the outer tube (1) is divided into three sections, two outer sections and a middle section; the inner diameter of the outer section is larger than the outer diameter of the middle section; a mounting step (14) is formed between the outer section and the middle section; two second inner liners (22) are respectively inserted into the outer section of the outer pipe (1) and are in contact with the mounting steps (14); the movement of the two second linings (22) in the axial direction of the second linings (22) is limited by fixing the pressure ring (13) and the flange.

6. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 5, wherein: a mounting nut (74) is arranged on the surface of the second lining (22) which is in contact with the mounting step (14); the mounting nut (74) is matched with a mounting screw (75) penetrating through the mounting step (14) for use; the mounting screw (75) is used for limiting relative rotation between the second inner liner (22) and the outer pipe (1).

7. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 1, wherein: the outer pipe (1) is fixedly connected with a pipeline through a pipeline clamp (5); outer tube (1) is formed with outer tube hole (1b), be formed with inside lining opening (223) on inside lining (2), nut (71) have been placed in inside lining opening (223), inside lining opening (223) and nut (71) looks adaptation and restriction nut (71) rotate, and screw (72) pass outer tube hole (1b) and nut (71) threaded connection with inside lining (2) and outer tube (1) fixed.

8. The fixed mounting structure for a liner-type ultrasonic flowmeter according to claim 3 or 5, wherein: and the compression ring (13) is bonded, in threaded connection or welded with the flange (10).

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