CN111649790B

CN111649790B - Antidetonation type digit vortex flowmeter

Info

Publication number: CN111649790B
Application number: CN202010538853.6A
Authority: CN
Inventors: 周启全; 李伟
Original assignee: Jiangsu Huahai M & C Technology Ltd
Current assignee: Jiangsu Huahai M & C Technology Ltd
Priority date: 2020-06-13
Filing date: 2020-06-13
Publication date: 2022-01-21
Anticipated expiration: 2040-06-13
Also published as: CN111649790A

Abstract

The invention provides an anti-seismic digital vortex shedding flowmeter, which comprises a probe assembly, a connecting rod, a shell flange and a converter connecting flange, wherein the probe assembly is inserted into a pipeline and used for measuring flowing fluid, the shell flange is used for connecting a detection device and the pipeline, the converter connecting flange is used for connecting a converter to the detection device, and the probe assembly is arranged at one end of the connecting rod in a welding mode. This anti-seismic digital vortex flowmeter probe assembly in the probe shell body be 304 stainless steel, with two measuring electrode group composition 3 electrode modes, grounding electrode of two measuring electrodes, guarantee the stability at zero point of measurement, the effectual general bayonet flowmeter measurement of having solved is unstable, receive the electrode magnetization influence easily and lead to the measurement accuracy to reduce, magnetic field interference influences measurement accuracy through influencing signal strength, receive installation and complex environment influence, the motor signal line is difficult to keep parallel with the magnetic line of force for a long time, the flowmeter can not keep the stable problem at zero point.

Description

Antidetonation type digit vortex flowmeter

Technical Field

The invention relates to the technical field of electromagnetic flowmeters, in particular to an anti-seismic digital vortex shedding flowmeter.

Background

The measuring principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, the measuring tube of the flowmeter is a non-magnetic conductive alloy short tube lined with insulating material, two electrodes penetrate through the tube wall along the tube diameter direction and are fixed on the measuring tube, the electrode tips of the electrodes are basically flush with the inner surface of the lining, and when the excitation coil is excited by bidirectional square wave pulse, a working magnetic field with the magnetic flux density of B is generated in the direction vertical to the axis of the measuring tube. At this time, if a fluid having a certain conductivity flows through the measuring tube, an electromotive force E is induced by cutting magnetic lines of force, the electromotive force E being proportional to the product of the magnetic flux density B, the inner diameter d of the measuring tube, and the average flow velocity V, the electromotive force E (flow signal) being detected by the electrodes and sent to the converter through the cable. The converter amplifies the flow signal, displays the flow of the fluid, and outputs pulse and analog current signals for controlling and regulating the flow.

The electromagnetic flowmeter is used for measuring the volume flow of conductive liquid and serous fluid in a closed pipeline, is suitable for industries such as petrochemical industry, ferrous metallurgy, water supply and drainage, irrigation, water treatment, environmental protection sewage total amount control, electric power, paper making, food and the like, particularly can use the electromagnetic flowmeter with large or even ultra-large caliber in the industries such as water supply and drainage, irrigation, water treatment, environmental protection sewage and the like, has lower precision requirement on the flowmeter, has high manufacturing and maintenance cost and inconvenient installation and maintenance by using the pipeline type electromagnetic flowmeter, cannot replace the flowmeter in time once the flowmeter is damaged, influences the metering, and the use of the plug-in flowmeter is easily influenced by the environment, particularly when the plug-in flowmeter is used on a large-caliber pipeline, because the pipeline has large caliber, the flow is large, the vibration amplitude of the pipeline is large, and the anti-vibration type vortex flowmeter is vertically influenced by the length and the vibration amplitude, and the flowmeter is difficult to be ensured to be always kept in a vertical state in the installation process and after the flowmeter is installed, the gravity center of the flowmeter tends to bend due to external force generated by vibration, the electrode signal line is difficult to be kept parallel with the magnetic force line for a long time, the measurement of the general plug-in flowmeter is unstable, the measurement accuracy is reduced due to the influence of electrode magnetization, the measurement accuracy is influenced by the influence of magnetic field interference on the signal intensity, the electrode signal line is difficult to be kept parallel with the magnetic force line for a long time due to the installation process and the complex environment, and the flowmeter cannot keep the zero point stable.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an anti-seismic digital vortex shedding flowmeter, which solves the problems that the measurement accuracy is reduced due to unstable measurement of a common plug-in flowmeter and easy to be influenced by electrode magnetization, the measurement accuracy is influenced by influencing signal strength through magnetic field interference, the motor signal line is difficult to keep parallel with a magnetic line of force for a long time due to the influence of an installation process and a complex environment, and the flowmeter cannot keep zero point stability.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an antidetonation type digital vortex flowmeter, carries out measuring probe subassembly, connecting rod, is arranged in being arranged in inserting the pipeline to the fluid of flowing through, is used for being connected the casing flange of usefulness with detecting device and pipeline and is used for connecting the converter flange on detecting device with the converter, the one end at the connecting rod is installed through the welded mode to probe subassembly, the surface of connecting rod is through welded mode fixedly connected with casing flange, but welded mode fixedly connected with converter flange is passed through at the top of connecting rod, but uses the fixed rear of welding frock probe subassembly, connecting rod, converter flange, casing flange to weld as an organic whole. Therefore, the flowmeter can be prevented from deforming and bending due to welding, and the product yield is ensured.

Preferably, the detection subassembly sets up in the inside of probe shell body, and the detection subassembly includes two electrode tips, one and measures base, coil pack, magnetic core, coil housing, magnetic circuit board, screw, probe shell body that have coil skeleton, two the electrode tip is direct pre-buried on measuring the base, two the electrode tip is the symmetric distribution as the symmetric line with the central line of measuring the base surface, two the degree of depth that the electrode tip is pre-buried at measuring the base keeps unanimous, the surface of measuring the base is provided with the mounting hole, magnetic core installs on the mounting hole of measuring the base, the coil pack cover is established on magnetic core.

Preferably, coil skeleton's both sides are provided with the card wire casing, two fixedly connected with electrode lead wire on the electrode head, two inside the card wire casing of coil skeleton both sides, two were accomodate respectively to the electrode lead wire the central line that the electrode lead wire used magnetic core is the symmetric distribution as the symmetrical line.

Preferably, the surface of the coil framework is provided with a mounting groove, the magnetic circuit board is mounted in the mounting groove of the coil framework, and the mounting direction of the magnetic circuit board is perpendicular to the connecting line of the two electrodes.

Preferably, the coil housing is sleeved outside the coil assembly, locking grooves are arranged on two sides of the coil housing, the measuring base is provided with a lock catch corresponding to the lock groove, the coil housing is fixedly connected with the measuring base through the lock groove and the lock catch, the coil housing passes through screw and magnetic conduction iron core fixed connection, coil housing top reservation has the injecting glue hole, need follow the injecting glue hole of the top of coil housing toward the inside epoxy glue of injecting of measuring part after the measuring part installation of probe, treat that the epoxy glue solidifies the back and can pack into in the probe shell, probe assembly assembles back again from probe shell top embedment epoxy glue, treat that the epoxy glue solidifies the back and can carry out equipment on next step, use the frock to measure partial encapsulation of probe in the probe shell, not only guarantee the reliability of product encapsulation, can also guarantee the uniformity of product.

Preferably, the material of magnetic circuit board is compression molding's silicon steel material, probe shell body material is 304 steel materials, measure the base and add glass fiber material injection moulding by polyphenylene sulfide, two the material of electrode tip is 316L stainless steel material.

Preferably, the coil assembly is wrapped by a copper foil with the thickness of 0.05mm, and the copper foil with the thickness of 0.05mm which needs to be wrapped outside the coil assembly can effectively shield external interference such as an external magnetic field or an electric field, so that the pureness of the internal magnetic field is ensured, and the strength of a measuring signal is improved.

Preferably, the gravity center stabilizing mechanism comprises a gravity center stabilizing ring, three adjusting pipes and a plurality of arc-shaped force transfer blocks, the gravity center stabilizing ring is sleeved on the surface of the connecting rod, the inner diameter of the gravity center stabilizing ring is larger than the diameter of the connecting rod, the inner wall of the gravity center stabilizing ring is slidably connected with a plurality of arc-shaped force transfer blocks distributed circumferentially, the arc-shaped concave surfaces of the arc-shaped force transfer blocks are in contact with the connecting rod, the side surface of each arc-shaped force transfer block is provided with an arc-shaped groove, the inner wall of the gravity center stabilizing ring is fixedly connected with a plurality of self-adaptive push springs, one end of each self-adaptive push spring, which is far away from the inner wall of the gravity center stabilizing ring, is fixedly connected with a self-adaptive clamping ball, the surface of the self-adaptive clamping ball is in contact with the inner wall of the arc-shaped groove, the surface of the gravity center stabilizing ring is fixedly connected with three adjusting pipes, and the inner wall of each adjusting pipe is slidably connected with an adjusting rod, one end of the adjusting rod is fixedly connected with a shock pad.

(III) advantageous effects

(1) All plastic parts of the invention are polyphenylene sulfide and glass fiber, thus not only ensuring the strength of the shell after being assembled into a whole, but also ensuring the sealing performance when the epoxy resin adhesive is filled and sealed after the assembly is finished, and preventing the sealant from leaking.

(2) The two electrode signal wires are clamped into the wire clamping grooves on the two sides of the coil framework, so that the two electrodes can be ensured to be symmetrical in the X, Y-axis direction, the plane of the electrode signal wire loop is basically parallel to the magnetic force line, and the zero point stability of the flowmeter is ensured.

(3) The installation direction of the magnetic circuit board is vertical to the connecting line of the two electrodes, the magnetic field is along the direction of the magnetic circuit board, the electrodes are avoided, the electrodes can be prevented from being magnetized by the magnetic field, the weight distribution of the magnetic field is met, the magnetic field can be concentrated together, the electromagnetic field generated by the coil is utilized to the maximum extent, and the flowmeter can accurately measure small flow.

(4) According to the invention, the copper foil with the thickness of 0.05mm needs to be wrapped outside the coil assembly, so that external interference such as an external magnetic field or an electric field can be effectively shielded, the purity of the internal magnetic field is ensured, and the strength of a measurement signal is improved.

(5) All parts of the probe measuring part are assembled into a whole after injection molding, and then epoxy resin glue is injected to form a sealed whole, so that the probe measuring part is waterproof and can prolong the service life of the probe.

(6) According to the invention, by arranging the gravity center stabilizing mechanism, the vibration direction of the flowmeter can be flexibly limited on the premise of keeping the flowmeter vibrating along with the pipeline, so that the vibration direction of the flowmeter keeps a uniform vertical direction at the gravity center position.

(7) The outer shell of the probe in the probe assembly is made of 304 stainless steel, and is combined with two measuring electrodes into a 3-electrode mode, and the two measuring electrodes are one grounding electrode, so that the stability of a measuring zero point can be ensured, and the problems that a common plug-in flowmeter is unstable in measurement, the measurement accuracy is reduced due to the influence of electrode magnetization, the measurement accuracy is influenced by the influence of magnetic field interference on signal strength, the motor signal line is difficult to keep parallel with a magnetic line of force for a long time due to the influence of an installation process and a complex environment, and the flowmeter cannot keep the zero point stable are solved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the probe assembly of the present invention;

FIG. 3 is an elevation view of the center of gravity stabilization mechanism of the present invention;

FIG. 4 is a cross-sectional view of the barycentric stabilizer ring mechanism of the present invention.

The device comprises a probe assembly 1, a 101 electrode head, a 102 measuring base, a 103 coil framework, a 104 coil assembly, a 105 magnetic conductive iron core, a 106 coil housing, a 107 magnetic circuit board, 108 screws, a 109 probe outer shell, 1010 mounting holes, 1011 wire clamping grooves, 1012 electrode leads, 1013 mounting grooves, 1014 locking grooves, 2 connecting rods, 3 shell flanges, 4 converter connecting flanges, 5 gravity center stabilizing mechanisms, 501 gravity center stabilizing rings, 502 adjusting pipes, 503 arc-shaped force transmission blocks, 504 arc-shaped grooves, 505 self-adaptive pushing springs, 506 self-adaptive clamping balls, 507 adjusting rods and 508 shock pads.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, an anti-vibration digital vortex shedding flowmeter according to an embodiment of the present invention includes a probe assembly 1 inserted into a pipeline to measure a fluid flowing through the pipeline, a connecting rod 2, a case flange 3 for connecting a detection device with the pipeline, and a converter connecting flange 4 for connecting a converter to the detection device, wherein the probe assembly 1 is installed at one end of the connecting rod 2 by welding, the case flange 3 is fixedly connected to the surface of the connecting rod 2 by welding, and the converter connecting flange 4 is fixedly connected to the top of the connecting rod 2 by welding.

The detection assembly is arranged inside the probe shell 109, the detection assembly comprises two electrode tips 101, a measurement base 102, a coil assembly 104 with a coil framework 103, a magnetic conductive iron core 105, a coil cover 106, a magnetic circuit board 107, screws 108 and the probe shell 109, the two electrode tips 101 are directly embedded on the measurement base 102, the two electrode tips 101 are symmetrically distributed by taking the center line of the surface of the measurement base 102 as a symmetrical line, the depths of the two electrode tips 101 embedded on the measurement base 102 are consistent, the surface of the measurement base 102 is provided with a mounting hole 1010, the magnetic conductive iron core 105 is mounted on the mounting hole 1010 of the measurement base 102, the coil assembly 104 is sleeved on the magnetic conductive iron core 105, wire clamping grooves 1011 are arranged on two sides of the coil framework 103, electrode leads 1012 are fixedly connected on the two electrode tips 101, the two electrode leads 1012 are respectively accommodated inside the wire clamping grooves 1011 on two sides of the coil framework 103, the two electrode leads 1012 are symmetrically distributed by taking the central line of the magnetic conductive iron core 105 as a symmetrical line, the surface of the coil framework 103 is provided with a mounting groove 1013, the magnetic circuit plate 107 is mounted in the mounting groove 1013 of the coil framework 103, the mounting direction of the magnetic circuit plate 107 is perpendicular to the connecting line of the two electrodes, the coil housing 106 is sleeved outside the coil assembly 104, two sides of the coil housing 106 are provided with locking grooves 1014, the measuring base 102 is provided with the coil housing 103 corresponding to the locking grooves 1014, the coil housing 106 is fixedly connected with the measuring base 102 through the locking grooves 1014 and the locking buckles, the coil housing 106 is fixedly connected with the magnetic conductive iron core 105 through the screws 108, the magnetic circuit plate 107 is made of compression molding silicon steel, the probe outer shell 109 is made of 304 steel, the measuring base 102 is injection molded by polyphenylene sulfide and glass fiber electrode tips, the two electrode tips 101 are made of 316L stainless steel, and the coil assembly 104 is wrapped by copper foil with the thickness of 0.05 mm.

The gravity center stabilizing mechanism 5 comprises a gravity center stabilizing ring 501, three adjusting pipes 502 and a plurality of arc-shaped force transfer blocks 503, the gravity center stabilizing ring 501 is sleeved on the surface of the connecting rod 4, the inner diameter of the gravity center stabilizing ring 501 is larger than the diameter of the connecting rod 4, the inner wall of the gravity center stabilizing ring 501 is connected with the plurality of arc-shaped force transfer blocks 503 which are distributed in the circumferential direction in a sliding mode, the arc-shaped concave surfaces of the arc-shaped force transfer blocks 503 are in contact with the connecting rod 4, the side surface of each arc-shaped force transfer block 503 is provided with an arc-shaped groove 504, the inner wall of the gravity center stabilizing ring 501 is fixedly connected with a plurality of self-adaptive push springs 505, one end of each self-adaptive push spring 505, which is far away from the inner wall of the gravity center stabilizing ring 501, is fixedly connected with a self-adaptive clamping ball 506, the surface of the self-adaptive clamping ball 506 is in contact with the inner wall of the arc-shaped groove 504, the surface of the gravity center stabilizing ring 501 is fixedly connected with the three adjusting pipes 502, the inner wall of each adjusting pipe 502 is connected with an adjusting rod 507 in a sliding mode, one end of the adjusting rod 507 is fixedly connected with a shock pad 508.

When the measuring device is used, the connecting rod 2 is inserted into a measuring pipeline, the flowmeter is connected with the measuring pipeline through the shell flange 3, the converter is installed on the flowmeter through the converter connecting flange 4, the gravity center stabilizing ring 501 slides up and down on the surface of the connecting rod 2, the gravity center stabilizing ring 501 slides to the gravity center position of the flowmeter, an appropriate number of arc-shaped force transmission blocks 503 are selected to be contacted with the surface of the connecting rod 2, a certain distance is kept between the arc-shaped force transmission blocks 503, the distance is smaller than the diameter of the self-adaptive clamping ball 506, then the adjusting rod 507 is extended to enable the shock absorption pad 508 on the adjusting rod 507 to be contacted with the ground, the plug-in flowmeter can carry out measuring operation, the electrode leads 1012 of the two electrode heads 101 are clamped into the clamping grooves 1011 on the two sides of the coil skeleton 103, the two electrode heads 101 are symmetrical in the direction of the X, Y axis, and the plane of the electrode lead loop is basically parallel to magnetic lines, the zero point of the flowmeter is stable, the magnetic field is along the direction of the magnetic circuit board 107, the electrodes are avoided, the magnetic field is prevented from magnetizing the electrodes, the magnetic field is distributed according with the weight of the magnetic field, the magnetic field is concentrated together, the electromagnetic field generated by the coil is utilized to the maximum, the flowmeter accurately measures the small flow, the vibration of the pipeline keeps the vertical state of the flowmeter under the limitation of the adjusting rod 507, the gravity center stabilizing ring 501 and the adjusting pipe 502, the vertical vibration of the flowmeter can slide on the inner side surface of the arc-shaped force transmission block 503, and in the process of up-down sliding, the self-adaptive push spring 505 always presses the arc-shaped force transmission block 503 through the self-adaptive clamping ball 506, so that the arc-shaped force transmission block 503 always tightly presses the converter connecting flange 4, and the converter connecting flange can not move in the direction of the gravity center.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. An anti-vibration digital vortex shedding flowmeter, which comprises a probe assembly (1) inserted into a pipeline for measuring fluid flowing through the pipeline, a connecting rod (2), a shell flange (3) for connecting a detection device with the pipeline, a converter connecting flange (4) for connecting a converter to the detection device, and a gravity center stabilizing mechanism (5) for keeping the gravity center of the flowmeter stable, and is characterized in that: the probe assembly (1) is installed at one end of the connecting rod (2) in a welding mode, the surface of the connecting rod (2) is fixedly connected with a shell flange (3) in a welding mode, and the top of the connecting rod (2) is fixedly connected with a converter connecting flange (4) in a welding mode;

the gravity center stabilizing mechanism (5) comprises a gravity center stabilizing ring (501), three adjusting pipes (502) and a plurality of arc-shaped force transfer blocks (503), the gravity center stabilizing ring (501) is sleeved on the surface of the connecting rod (4), the inner diameter of the gravity center stabilizing ring (501) is larger than the diameter of the connecting rod (4), the inner wall of the gravity center stabilizing ring (501) is connected with a plurality of arc-shaped force transfer blocks (503) which are distributed circumferentially in a sliding manner, the arc-shaped concave surface of each arc-shaped force transfer block (503) is in contact with the connecting rod (4), the side surface of each arc-shaped force transfer block (503) is provided with an arc-shaped groove (504), the inner wall of the gravity center stabilizing ring (501) is fixedly connected with a plurality of self-adaptive push springs (505), each self-adaptive push spring (505) is far away from the one end of the inner wall of the gravity center stabilizing ring (501) and is fixedly connected with a self-adaptive clamping ball (506), the surface of each self-adaptive clamping ball (506) is in contact with the inner wall of the arc-shaped groove (504), the surface of the gravity center stabilizing ring (501) is fixedly connected with three adjusting pipes (502), the inner wall of each adjusting pipe (502) is connected with an adjusting rod (507) in a sliding mode, and one end of each adjusting rod (507) is fixedly connected with a damping pad (508).

2. An anti-seismic digital vortex shedding flowmeter according to claim 1, wherein: the detection assembly is arranged inside the probe outer shell (109) and comprises two electrode tips (101), a measurement base (102), a coil assembly (104) with a coil framework (103), a magnetic conductive iron core (105), a coil housing (106), a magnetic circuit plate (107), screws (108) and the probe outer shell (109), wherein the two electrode tips (101) are directly embedded on the measurement base (102), the two electrode tips (101) are symmetrically distributed by taking the center line of the surface of the measurement base (102) as a symmetry line, the depth of the two electrode tips (101) embedded in the measurement base (102) is kept consistent, the surface of the measuring base (102) is provided with a mounting hole (1010), the magnetic conductive iron core (105) is mounted on the mounting hole (1010) of the measuring base (102), and the coil assembly (104) is sleeved on the magnetic conductive iron core (105).

3. An anti-seismic digital vortex shedding flowmeter according to claim 2, wherein: the both sides of coil skeleton (103) are provided with card wire casing (1011), two fixedly connected with electrode lead (1012) on electrode tip (101), two inside the card wire casing (1011) of coil skeleton (103) both sides were accomodate respectively in electrode lead (1012), two electrode lead (1012) are the symmetric distribution as the symmetric line with the central line of magnetic core (105).

4. An anti-seismic digital vortex shedding flowmeter according to claim 3, wherein: the surface of the coil framework (103) is provided with a mounting groove (1013), the magnetic circuit board (107) is mounted in the mounting groove (1013) of the coil framework (103), and the mounting direction of the magnetic circuit board (107) is perpendicular to the connecting line of the two electrodes.

5. An anti-seismic digital vortex shedding flowmeter according to claim 4, wherein: the coil housing (106) is sleeved outside the coil assembly (104), locking grooves (1014) are formed in two sides of the coil housing (106), 103 corresponding to the locking grooves (1014) are arranged on the measuring base (102), the coil housing (106) is fixedly connected with the measuring base (102) through the locking grooves (1014) and the lock catches, and the coil housing (106) is fixedly connected with the magnetic conductive iron core (105) through a screw (108).

6. An anti-seismic digital vortex shedding flowmeter according to claim 5, wherein: the material of magnetic circuit board (107) is compression molding's silicon steel material, probe shell body (109) material is 304 steel material, measure base (102) and add glass fiber material injection moulding by polyphenylene sulfide, two the material of electrode tip (101) is 316L stainless steel material.

7. An anti-seismic digital vortex shedding flowmeter according to claim 6, wherein: the wire

The outside of the ring component (104) is wrapped with a copper foil with the thickness of 0.05 mm.