CN116734934B - Compact electromagnetic flowmeter, installation method and flow measuring method - Google Patents
Compact electromagnetic flowmeter, installation method and flow measuring method Download PDFInfo
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- CN116734934B CN116734934B CN202311006853.1A CN202311006853A CN116734934B CN 116734934 B CN116734934 B CN 116734934B CN 202311006853 A CN202311006853 A CN 202311006853A CN 116734934 B CN116734934 B CN 116734934B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 16
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- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 6
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 230000000712 assembly Effects 0.000 claims description 12
- 238000000429 assembly Methods 0.000 claims description 12
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- 230000006698 induction Effects 0.000 claims description 11
- 210000004907 gland Anatomy 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 23
- 238000000691 measurement method Methods 0.000 abstract description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a compact electromagnetic flowmeter, an installation method and a flow measurement method, which relate to the field of flow measurement and comprise a measurement inner tube lined with PEEK materials, wherein connecting pipes are connected at two ends of the measurement inner tube in a sealing manner, an end section, a transition section and a small-diameter section are sequentially arranged on the measurement inner tube from two ends to the middle, and the inner diameter of the small-diameter section is smaller than the inner diameter of the end section; the transition section is conical, so that the small-diameter section and the end section are smoothly transitioned; the outer diameter of the small-diameter section is smaller than that of the end section, and an installation space is formed at the outer wall of the small-diameter section; a coil assembly for generating a magnetic field is installed in the installation space; a first electrode and a second electrode for acquiring induced electromotive force are arranged at the small-diameter section, the coil assembly, the first electrode and the second electrode are all connected to a measuring assembly, and the measuring assembly is arranged on the outer wall of the measuring inner tube; the invention integrates the sensor and the converter of the traditional flowmeter, has small and exquisite appearance and flexible installation, and reduces the change of the pipeline and the possible damage to the pipeline.
Description
Technical Field
The invention relates to the field of flow measurement, in particular to a compact electromagnetic flowmeter, an installation method and a flow measurement method.
Background
An electromagnetic flowmeter is an inductive meter manufactured according to faraday's law of electromagnetic induction for measuring the volumetric flow rate of a conductive liquid. The existing electromagnetic flowmeter mainly comprises a converter, a sensor and a connecting cable, wherein the sensor is particularly large in volume due to the limitation of a coil, the converter is also large in volume, a fixed bracket or a support is required to support the sensor and the coil when the electromagnetic flowmeter is installed, and the cylindrical pipeline surface is arc-shaped because the pipeline is cylindrical, so that the internal space of the flowmeter is smaller, the exciting coil with larger volume and the sensor are inconvenient to install, and the pipeline is likely to deform or even damage the pipeline or the flowmeter when the electromagnetic flowmeter is installed; secondly, the current flowmeter comprises a straight pipe section which is required to exist at the installation position of the electromagnetic flowmeter, and the length of the straight pipe section is usually more than 5 times of the diameter of a pipeline, so that the rectification function is realized, the turbulence of liquid entering the flowmeter is avoided, and the measurement accuracy is influenced; this approach increases the space required to install the flowmeter in the field, and even requires changes in the pipeline routing to achieve this installation objective, increasing the complexity of the installation.
Disclosure of Invention
The invention aims at: aiming at the problems, the compact electromagnetic flowmeter, the installation method and the flow measuring method are provided, the sensor and the converter of the traditional flowmeter are integrated, the appearance is small and exquisite, the installation is flexible, and the change of a pipeline and the possible damage to the pipeline are reduced.
The technical scheme adopted by the invention is as follows: the utility model provides a compact electromagnetic flowmeter, includes the measurement inner tube that has the PEEK material of lining, the both ends sealing connection of measurement inner tube has the connecting pipe, be tip section, changeover portion and path section from both ends to centre on the measurement inner tube in proper order, the internal diameter of path section is less than the internal diameter of tip section; the transition section is conical, so that the small-diameter section and the end section are smoothly transitioned; the outer diameter of the small-diameter section is smaller than that of the end section, and an installation space is formed at the outer wall of the small-diameter section; at least two groups of coil assemblies for generating magnetic fields are arranged in the installation space; the small-diameter section is provided with a first electrode and a second electrode for obtaining induced electromotive force, the coil assembly, the first electrode and the second electrode are all connected to a measuring assembly, and the measuring assembly is arranged on the outer wall of the measuring inner tube.
Further, a shielding cylinder is included, the shielding cylinder surrounds the small diameter section, the coil assembly is located inside the shielding cylinder, and the measuring assembly is located outside the shielding cylinder.
Further, the coil assembly comprises an iron core and a coil wound on the iron core, constraint plates are arranged at two ends of the iron core, an installation groove is formed in the outer wall of the small-diameter section, the geometric dimension of the installation groove is matched with that of the constraint plates, and the iron core is installed in the installation groove.
Further, the iron core installation groove is formed in the outer side of the shielding barrel, the small-diameter section is provided with a small-diameter section, and the small-diameter section is provided with a small-diameter section.
Further, the measuring assembly comprises a communication board, a power board, a CPU board and a signal acquisition board which are indirectly or directly connected, wherein the communication board, the power board, the CPU board and the signal acquisition board are circumferentially arranged along the measuring inner pipe; all be connected with the ground connection shell fragment on communication board, power strip, CPU board and the signal acquisition board, the ground connection shell fragment is connected with the connecting pipe.
Further, the transition section comprises an outlet transition section arranged at the outlet of the small-diameter section, a third electrode is arranged at the outlet transition section, and the third electrode is electrically connected with the signal acquisition board.
Further, a counter bore is formed in the third electrode, a temperature sensor is arranged in the counter bore, and the temperature sensor is connected with the signal acquisition plate.
Further, the measuring device also comprises a shell, wherein the shell surrounds the measuring inner tube, two ends of the shell are respectively connected with the connecting tube, an assembly space is formed between the inner wall of the shell and the outer wall of the measuring inner tube, and the measuring assembly and the coil assembly are both arranged in the assembly space; the shell is provided with a display panel and an electric connector which are both connected with the measuring assembly.
A method for installing a compact electromagnetic flowmeter,
a: for the installation environment with a horizontal pipeline and a low pipeline, the spatial position of the low pipeline is lower than that of the horizontal pipeline, and the compact electromagnetic flowmeter is installed on the low pipeline;
b: for the installation environment with a horizontal pipeline and a high-level pipeline, the spatial position of the high-level pipeline is higher than that of the installation environment of the horizontal pipeline, and the compact electromagnetic flowmeter is installed on a transition pipeline between the low-level pipeline and the high-level pipeline;
c: for an installation environment with a pump, a compact electromagnetic flowmeter may be installed on the suction side of the pump;
d: for an installation environment with a valve, a compact electromagnetic flowmeter may be installed on the upstream side of the valve.
A flow measuring method of a compact electromagnetic flowmeter, which comprises the following steps:
s1: the liquid enters the transition section from the connecting pipe through the end section, the liquid is converged towards the axis to finish rectification through the restraint of the transition section, and then enters the small-diameter section;
s2: the liquid cuts the magnetic induction line generated by the coil assembly at the small-diameter section to form induced electromotive force, the induced electromotive force is acquired by the first electrode and the second electrode and transmitted to the measuring assembly, the measuring assembly calculates the flow velocity V1 of the liquid at the small-diameter section according to the induced electromotive force, and the flow velocity V2 of the liquid in the pipeline is reversely pushed according to the proportional relation between the inner diameter D1 of the small-diameter section and the inner diameter D2 of the pipeline;
s3: in step S2, the flow velocity of the liquid at the small diameter section is increased, the speed of the liquid cutting magnetic induction line is increased, the generated induced electromotive force is increased, and the measurement range and the application environment of the compact electromagnetic flowmeter are improved.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the PEEK material is lined in the inner measuring tube, so that the inner measuring tube can adapt to a negative pressure state, and can still work normally under the negative pressure state;
2. the invention integrates the measuring inner tube, the coil component and the measuring component to ensure that the whole flowmeter has small volume and can adapt to the environment with dense field pipelines and limited installation space;
3. the special appearance of the inner tube is measured, so that the space for installing the coil assemblies is provided, the occupied space of the flowmeter is reduced, the distance between the coil assemblies can be reduced, higher magnetic field intensity and more uniform magnetic field can be generated between the coil assemblies under the same conditions, and the accuracy of measuring flow and the accuracy of data are improved;
4. according to the invention, the small-diameter section is arranged, and the transition section exists between the small-diameter section and the end section, so that the liquid can be restrained from converging towards the axis, the flow of the liquid entering the small-diameter section is more stable, the rectifying effect is achieved, and the phenomenon that the flow velocity is influenced by turbulent flow of the liquid is avoided; the small-diameter section is arranged, and rectification by using the straight pipe section is not needed to be considered when the flowmeter is installed, so that the installation occasion is more free and the adaptability is improved;
5. according to the invention, by arranging the small-diameter section, the flow speed of liquid entering the small-diameter section can be increased, so that the speed of cutting the magnetic induction line is higher, the generated induced electromotive force is larger, namely more obvious electric signals can be generated, and the flowmeter is suitable for liquid media with low flow speed and low conductivity.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic three-dimensional profile of a flowmeter of the present disclosure;
FIG. 2 is a schematic front elevational view of the disclosed flowmeter;
FIG. 3 is a schematic cross-sectional view taken in the direction A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view of the structure in the direction B-B in FIG. 3;
FIG. 5 is a schematic cross-sectional view of the structure of FIG. 3 in the direction C-C;
FIG. 6 is a schematic view of a shielding can according to the present disclosure;
FIG. 7 is a schematic diagram of the installation of the disclosed flowmeter for case A;
FIG. 8 is a schematic diagram of the installation of the disclosed flowmeter for case B;
FIG. 9 is a schematic diagram of the installation of the disclosed flowmeter for case C;
FIG. 10 is a schematic view of the installation of the disclosed flowmeter for case D;
the marks in the figure: 1-a first electrode; 2-a second electrode; 3-measuring the inner tube; 31-end section; 32-transition section; 321-an outlet transition section; 33-small diameter section; 4-iron core; 41-a restraint panel; 5-coil; 6-shielding cylinder; 7-capping; 8-a signal acquisition board; 9-a CPU board; 10-a display panel; 11-electrical connectors; 12-a communication board; 13-a power panel; 14-a housing; 15-connecting pipes; 16-a temperature sensor; 17-a third electrode; 18-a grounding spring piece; 19-valve; 20-horizontal pipeline; 21-low level piping; 22-transition duct; 23-pump.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
As shown in fig. 1-6, a compact electromagnetic flowmeter includes the following components and structures.
The inner tube 3 is measured, and PEEK material is lined on the inner wall of the inner tube 3, so that the flow meter has the capability of resisting negative pressure, and can work normally in a negative pressure state; the lining is accomplished to PEEK material integrated into one piece on measuring inner tube 3 inner wall, and integrated into one piece's messenger material intensity distribution is even, can not appear weak position, improves the stability performance of work under the negative pressure state.
The connecting pipes 15 are used for being connected with the pipelines, are assembled at the two ends of the measuring inner pipe 3, and are connected with the two ends of the measuring inner pipe 3 in a sealing way, so that the measuring inner pipe 3 is communicated with the pipelines; the sealing connection can be realized by arranging a sealing groove on the outer wall of the measuring inner tube 3 or the inner wall of the connecting tube 15, arranging a sealing ring in the sealing groove, and extruding the sealing ring between the measuring inner tube 3 and the connecting tube 15; the connection tube 15 may be connected to the pipeline by a threaded nut, a chuck, or a flange-bolt, all of which are conventional to those skilled in the art and will not be described in detail herein.
In this embodiment, two ends of the inner tube 3 are end sections 31, the end sections 31 are used for being connected with the connecting tube 15 in a sealing way, the middle position of the inner tube 3 is a small diameter section 33, the flow velocity is measured at the small diameter section 33, and the inner diameter of the small diameter section 33 is smaller than the inner diameter of the end sections 31; the small-diameter section 33 and the end section 31 are transition sections 32, and the transition sections 32 are tapered, so that the small-diameter section 33 and the end section 31 are smoothly transited, liquid is guided to smoothly enter the small-diameter section 33 from the end section 31, and flows out of the small-diameter section 33 into the end section 31; the outer diameter of the small diameter section 33 is smaller than that of the end section 31, and an installation space is formed at the outer wall of the small diameter section 33, namely, the section of the whole measuring inner tube 3 corresponds to a V shape, and the installation space is a V-shaped inner space.
The installation space provides an installation position for the coil assembly, so that the flowmeter can be highly integrated, and the occupied volume of the flowmeter is reduced.
At least two groups of coil components are arranged in the installation space, the coil components form a magnet after being electrified, magnetic induction wires are arranged among the coil components, pass through the small-diameter section 33, and form an included angle with the axis of the small-diameter section 33; the liquid has conductivity and can be regarded as a conductor, when flowing in the small-diameter section 33, the magnetic induction line is cut to generate induced electromotive force, the magnitude of the induced electromotive force has a direct relation with the speed of the conductor cutting the magnetic induction line, namely, a functional relation exists between the flow rate of the liquid and the magnitude of the induced potential, and the flow rate of the liquid can be obtained by measuring the induced electromotive force.
The first electrode 1 and the second electrode 2 are installed at the position of the small diameter section 33, are in contact with the inside of the small diameter section 33, and are used for acquiring the induced electromotive force generated at the small diameter section 33.
It should be noted that in this embodiment, the coil assemblies may be two groups, and mirror images are arranged in the circumferential direction of the small-diameter section 33; the connecting line of the first electrode 1 and the second electrode 2, the connecting line of the mounting positions of the two groups of coil assemblies and the axis of the small-diameter section 33 are mutually perpendicular, so that components are prevented from being existed, and the measurement accuracy is prevented from being influenced.
The measuring assembly is arranged on the outer wall of the measuring inner tube 3, is electrically or signally connected with the first electrode 1, the second electrode 2 and the coil assembly, and is provided with the coil assembly for providing energy for generating a magnetic field and receiving and processing the induced electromotive force obtained jointly by the first electrode 1 and the second electrode 2.
In the present embodiment, the specific arrangement of the inner tube 3 is measured, and at least the following effects exist.
1. The coil assembly can be arranged in a space, and compared with a straight pipe, the flowmeter is smaller in size and smaller in occupied space.
2. The distance between the coil assemblies can be reduced, so that higher magnetic field intensity and more uniform magnetic field can be generated between the coil assemblies under other identical conditions, and the accuracy of measuring flow and the accuracy of data are improved.
3. The small-diameter section 33 and the transition section 32 exist, and the transition section 32 can restrict the liquid from converging towards the axis, so that the liquid entering the small-diameter section 33 flows more stably, the rectifying effect is achieved, and the phenomenon that turbulence of the liquid affects the measurement of the flow velocity is avoided; the small diameter section 33 is arranged, and the flow meter is installed without considering the rectification by using the straight pipe section, so that the installation occasion is more free and the adaptability is improved.
4. The flow rate of liquid entering the small-diameter section 33 is increased, so that the speed of cutting the magnetic induction line is higher, the generated induced electromotive force is larger, namely, more obvious electric signals can be generated, and the flowmeter is suitable for liquid media with low flow rate and low conductivity.
The connection position of the first electrode 1 and the small-diameter section 33 and the connection position of the second electrode 2 and the small-diameter section 33 are provided with mounting through holes, the first electrode 1 or the second electrode 2 is mounted in the mounting through holes and can be locked by a bolt, and the sealing ring is also provided with a sealing ring, and the sealing ring is tightly pressed between the first electrode 1 and the small-diameter section 33 and between the second electrode 2 and the small-diameter section 33, so that the sealing effect is achieved.
Example 2
As shown in fig. 1-6, further embodiments are presented that can be implemented on the basis of example 1.
An alternative embodiment may be provided with a shielding cylinder 6, wherein the shielding cylinder 6 surrounds the small-diameter section 33, so that induced electromotive force generated at the small-diameter section 33 is prevented from being disturbed by electric potential generated at other positions, such as electric potential from a measuring assembly or electric potential guided in thunderstorm weather air, and measurement accuracy is improved; the coil assembly is positioned at the inner side of the shielding cylinder 6, the measuring assembly is positioned at the outer side of the shielding cylinder 6, the shielding cylinder 6 separates the coil assembly from the measuring assembly and can shield a magnetic field, so that a component with current in the measuring assembly is subjected to ampere force, the change of the mounting position of an element in the measuring assembly for a long time is avoided, and the normal operation of the measuring assembly is ensured; the magnetic field can be prevented from being influenced by the electric field possibly generated by the measuring assembly, and the measuring precision is ensured.
In the present embodiment, the shielding cylinder 6 may be made of silicon steel.
With respect to the structure of the "coil block", a practical embodiment is as follows.
The coil assembly comprises an iron core 4 and coils 5 wound on the iron core 4, wherein constraint plates 41 are arranged at two ends of the iron core 4 and used for constraining the coils 5 to prevent the coils 5 from being scattered from the two ends of the iron core 4; the outer wall of the small-diameter section 33 is provided with a mounting groove, the geometric dimension of the mounting groove is matched with that of the constraint plate 41, the iron core 4 is mounted in the mounting groove, the mounting positions of the iron core 4 and the coil 5 are ensured to be stable, and the influence of the change of the mounting positions on the flow velocity measurement of the flowmeter in the use process is avoided.
It should be noted that a transition plate for connecting the wires of the coil 5 may be provided on the constraint plate 41, and the transition plate is connected with the measurement assembly through the wires, so as to avoid disorder of the wire distribution of the coil 5 and further ensure the winding stability of the coil 5.
The practical implementation mode further comprises a gland 7, the cross section of the gland 7 is similar to a U shape, the gland 7 is buckled on the outer side of the shielding cylinder 6 and is locked with the outer wall of the small-diameter section 33 through a screw, so that the gland 7 applies pressure to the shielding cylinder 6, the shielding cylinder 6 transmits the pressure to the constraint plate 41 of the iron core 4, the iron core 4 is tightly pressed in the installation groove on the small-diameter section 33, and the purpose of improving the installation position stability of the iron core 4 is achieved.
It should be noted that, in order to make the shielding cylinder 6 have the best shielding effect, the shielding cylinder 6 needs to be completely closed, usually a whole piece of material is bent, and the joints are butted and fixed so that the shielding cylinder 6 is completely closed; because of the position distribution relationship of the two groups of coil assemblies and the strength of the material of the shielding cylinder 6, the structure of the shielding cylinder 6 is not suitable for the embodiment, and particularly, the structure cannot transmit the pressure from the gland 7; to solve this problem, the joints of the shielding cylinder 6 may be displaced and extended partly so that one joint is partly inside the shielding cylinder 6 and the other joint is outside the shielding cylinder 6 and has an overlapping area, in such a way that a complete closure of the shielding cylinder 6 is also achieved and the two structures are not fixed to each other, so that the shielding cylinder 6 has a force to transmit the compression force.
Example 3
As shown in fig. 1-5, on the basis of any one of the embodiments 1-2, a practical embodiment is further proposed.
A possible embodiment relates to a measuring assembly comprising at least a communication board 12, a power board 13, a CPU board 9 and a signal acquisition board 8, which are connected to each other indirectly or directly.
A communication board 12 for transmitting the acquired data to the user terminal, and acquiring the instruction of the user terminal, and transmitting the phase Guan Zhiling to the CPU board 9 for processing; the communication board 12 is connected with an electric connector 11, and data transmission can be performed at least through two modes of analog signal output and RS485 (MODBUS) communication wiring output.
The power supply board 13 converts an input power into a voltage required for other electric components and coil assemblies.
The CPU board 9 receives and processes the data acquired by the signal acquisition board 8, and can also process related instructions from a user side to control the operation of all the electric elements and coil assemblies; an ARM Cortex-M4 32-bit processor can be adopted, and has the characteristics of high operation speed, high precision, low-frequency rectangular wave excitation, programmable excitation frequency, improved flow measurement stability, low power consumption and the like.
The CPU board 9 may be connected to a display board 10, and the acquired data may be displayed on the display board 10.
The signal acquisition board 8 is connected with the first electrode 1 and the second electrode 2 and receives the induced electromotive force acquired by the first electrode 1 and the second electrode 2; the signal acquisition board 8 can be provided with an amplifying circuit between a 24-bit ADC data acquisition system and the first electrode 1 and the second electrode 2.
The communication board 12, the power board 13, the CPU board 9 and the signal acquisition board 8 are all provided with a grounding spring piece 18, the grounding spring piece 18 is connected with the connecting pipe 15, and the grounding is realized through a pipeline connected with the connecting pipe 15, so that the protection and anti-interference capability are realized.
A possible embodiment is also provided with a third electrode 17; depending on the direction of flow of the liquid in the measuring inner tube 3, the downstream transition 32 is referred to as outlet transition 321, and the third electrode 17 is arranged at the location of the outlet transition 321 for assisting in detecting empty tubes.
It should be noted that, the first electrode 1 and the second electrode 2 can also detect empty tubes, that is, when the first electrode 1 and the second electrode 2 detect that induced electromotive force cannot be obtained, the empty tube is detected by adding a third electrode 17, so that the detection accuracy of the empty tube can be improved and the empty tube is compatible with low-conductivity medium; the third electrode 17 is arranged at the position of the outlet transition section 321, the situation that the flow meter is vertically arranged when in field use is considered, and for the condition that liquid flows from bottom to top, whether water exists in the flow meter or not can be ensured by the arrangement position of the third electrode 17, and the air pipe judgment accuracy is ensured.
In this embodiment, the third electrode 17 measures and detects the empty pipe by providing the third electrode 17 with current, if the empty pipe is empty, the air has larger resistance, the current cannot be transmitted to the pipeline through the air in the pipe, no current exists on the pipeline, the pipeline is connected with the measuring component through the grounding spring sheet 18, i.e. the device cannot acquire a current loop, namely, the state can be judged as the empty pipe state; conversely, if the pipe is a non-empty pipe, the current can be transferred to the pipe through the liquid, and the current on the pipe can be returned through the grounding spring plate 18, the state in the pipe is indicated as the non-empty pipe.
In the present embodiment, the third electrode 17 can serve not only as an electrode for empty pipe detection but also as a ground electrode, thereby improving the anti-interference capability.
A practical embodiment further comprises a temperature sensor 16 for sensing the temperature of the liquid in the pipe.
In this embodiment, the third electrode 17 may also be used as a protective shell of the temperature sensor 16, specifically, the third electrode 17 is provided with a counterbore, the temperature sensor 16 is assembled in the counterbore, and the temperature sensor 16 is connected with the signal acquisition board 8.
The connection of the third electrode 17 to the measuring inner tube 3 can be locked by a screw, and a sealing ring is provided, which is pressed between the third electrode 17 and the measuring inner tube 3 to achieve a sealing effect.
Example 4
As shown in fig. 1-5, further possible embodiments are presented on the basis of any one of the embodiments 1-3.
The measuring device further comprises a shell 14, wherein the shell 14 is made of stainless steel, the shell 14 surrounds the measuring inner tube 3, two ends of the shell 14 are respectively connected with the connecting tubes 15, an assembling space is formed between the inner wall of the shell 14 and the outer wall of the measuring inner tube 3, and the measuring assembly and the coil assembly are both arranged in the assembling space; the housing 14 serves as a protection; the display panel 10 and the electrical connector 11 may be disposed on the housing 14.
Example 5
In order to avoid measurement errors caused by gas inclusion in the liquid in the pipeline when the compact electromagnetic flowmeter disclosed in any one of embodiments 1 to 4 is used for measuring the flow, a method for installing the compact electromagnetic flowmeter is proposed, which is divided into four cases, namely A, B, C, D, as shown in fig. 7 to 10.
A: as shown in fig. 7, for the flow of liquid from the horizontal pipe 20 to the low-level pipe 21, the low-level pipe 21 is located at a space position lower than the installation environment of the horizontal pipe 20, and a compact electromagnetic flowmeter is installed on the low-level pipe 21;
for the case A, when water exists in the horizontal pipeline 20 and the low-level pipeline 21, bubbles can exist in the horizontal pipeline 20, and the low-level pipeline 21 can be completely filled with liquid, so that the bubbles can not enter the compact electromagnetic flowmeter, and the measurement precision of the compact electromagnetic flowmeter is ensured.
B: as shown in fig. 8, for the liquid level conduit 20 to flow to the high level conduit, the high level conduit is located at a spatial position higher than the installation environment of the level conduit 20, and the compact electromagnetic flowmeter is installed on the transition conduit 22 between the low level conduit 21 and the high level conduit;
for the case B, as the liquid needs to flow to the high-level pipeline, the liquid is pushed in the transition pipeline 22, so that the transition pipeline 22 can be completely filled, bubbles can not enter the compact electromagnetic flowmeter, and the measurement accuracy of the compact electromagnetic flowmeter is ensured.
C: as shown in fig. 9, for an installation environment having a pump 23, a compact electromagnetic flowmeter may be installed on the suction side of the pump 23;
for the C condition, the suction side of the pump 23 is opposite to the outlet of the pump 23, so that the liquid flow is more stable, the turbulence phenomenon is avoided, and the measurement precision of the compact electromagnetic flowmeter is ensured.
D: as shown in fig. 10, for an installation environment having the valve 19, a compact electromagnetic flowmeter may be installed on the upstream side of the valve 19.
For the case D, the upstream of the valve 19 is opposite to the downstream of the valve 19, so that the liquid flow is more stable, the turbulence phenomenon is avoided, and the measurement precision of the compact electromagnetic flowmeter is ensured.
Example 6
As shown in fig. 1 to 10, a flow measurement method of a compact electromagnetic flowmeter, which is applied to the compact electromagnetic flowmeter according to any one of the embodiments 1 to 4, includes the following steps:
s1: the liquid from the connecting pipe 15 passes through the end section 31 and enters the transition section 32, the restriction of the transition section 32 ensures that the liquid is converged towards the axis to finish rectification, and then enters the small-diameter section 33;
s2: the liquid cuts the magnetic induction line generated by the coil assembly at the small-diameter section 33 to form induced electromotive force, the induced electromotive force is acquired by the first electrode 1 and the second electrode 2 and transmitted to the measuring assembly, the measuring assembly calculates the flow velocity V1 of the liquid at the small-diameter section 33 according to the induced electromotive force, and the flow velocity V2 of the liquid in the pipeline is reversely pushed according to the proportional relation between the inner diameter D1 of the small-diameter section 33 and the inner diameter D2 of the pipeline;
the product of the flow rate and the flow area also yields the volumetric flow rate.
S3: in step S2, for low flow rate or/and low conductivity liquid flow measurement, the flow rate of the liquid at the small diameter section 33 is increased, the speed of the liquid cutting magnetic induction line is increased, the generated induced electromotive force is increased, the first electrode 1 and the second electrode 2 can obtain larger induced electromotive force, and the measurement range and the application environment of the compact electromagnetic flowmeter are improved.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (6)
1. A compact electromagnetic flowmeter, characterized by: the measuring inner tube (3) is lined with PEEK materials, connecting pipes (15) are connected to the two ends of the measuring inner tube (3) in a sealing mode, an end section (31), a transition section (32) and a small-diameter section (33) are sequentially arranged on the measuring inner tube (3) from the two ends to the middle, and the inner diameter of the small-diameter section (33) is smaller than that of the end section (31); the transition section (32) is conical, so that the small-diameter section (33) and the end section (31) are smoothly transitioned; the outer diameter of the small-diameter section (33) is smaller than that of the end section (31), and an installation space is formed at the outer wall of the small-diameter section (33); at least two groups of coil assemblies for generating magnetic fields are arranged in the installation space; a first electrode (1) and a second electrode (2) for acquiring induced electromotive force are arranged at the small-diameter section (33), the coil assembly, the first electrode (1) and the second electrode (2) are all connected with a measuring assembly, and the measuring assembly is arranged on the outer wall of the measuring inner tube (3); the measuring assembly at least comprises a communication board (12), a power board (13), a CPU board (9) and a signal acquisition board (8) which are connected with each other indirectly or directly, wherein the communication board (12), the power board (13), the CPU board (9) and the signal acquisition board (8) are circumferentially arranged along the measuring inner tube (3); the communication board (12), the power board (13), the CPU board (9) and the signal acquisition board (8) are connected with a grounding spring piece (18), and the grounding spring piece (18) is connected with the connecting pipe (15); the transition section (32) comprises an outlet transition section (32) arranged at the outlet of the small-diameter section (33), a third electrode (17) is arranged at the outlet transition section (32), and the third electrode (17) is electrically connected with the signal acquisition board (8); the device further comprises a shielding barrel (6), wherein the shielding barrel (6) surrounds the small-diameter section (33), the coil assembly is positioned on the inner side of the shielding barrel (6), the measuring assembly is positioned on the outer side of the shielding barrel (6), the shielding barrel (6) is provided with two joints which are staggered with each other, and the staggered parts are provided with overlapping areas.
2. The compact electromagnetic flowmeter of claim 1, wherein: the coil assembly comprises an iron core (4) and coils (5) wound on the iron core (4), constraint plates (41) are arranged at two ends of the iron core (4), mounting grooves are formed in the outer wall of the small-diameter section (33), the geometric dimension of each mounting groove is matched with that of each constraint plate (41), and the iron core (4) is mounted in each mounting groove.
3. The compact electromagnetic flowmeter of claim 2, wherein: the novel iron core assembly comprises a shielding barrel (6), and is characterized by further comprising a gland (7), wherein the gland (7) is buckled on the outer side of the shielding barrel (6) and is connected with the outer wall of the small-diameter section (33), and the gland (7) tightly presses the iron core (4) in the mounting groove through the shielding barrel (6).
4. The compact electromagnetic flowmeter of claim 1, wherein: the third electrode (17) is provided with a countersunk hole, a temperature sensor (16) is arranged in the countersunk hole, and the temperature sensor (16) is connected with the signal acquisition board (8).
5. The compact electromagnetic flowmeter of claim 1, wherein: the measuring device further comprises a shell (14), wherein the shell (14) surrounds the measuring inner tube (3) and two ends of the shell are respectively connected with the connecting tube (15), an assembly space is formed between the inner wall of the shell (14) and the outer wall of the measuring inner tube (3), and the measuring assembly and the coil assembly are both arranged in the assembly space; the shell (14) is provided with a display panel (10) and an electric connector (11) which are both connected with the measuring assembly.
6. A flow measuring method of a compact electromagnetic flowmeter is characterized in that: use of the compact electromagnetic flowmeter of any of claims 1-5, comprising the steps of:
s1: the liquid passes through the end section (31) from the connecting pipe (15) and enters the transition section (32), the liquid is converged towards the axis to finish rectification by the restraint of the transition section (32), and then enters the small-diameter section (33);
s2: the liquid cuts a magnetic induction line generated by the coil assembly at the small-diameter section (33) to form induced electromotive force, the induced electromotive force is acquired by the first electrode (1) and the second electrode (2) and transmitted to the measuring assembly, the measuring assembly calculates the flow velocity V1 of the liquid at the small-diameter section (33) according to the induced electromotive force, and the flow velocity V2 of the liquid in the pipeline is reversely pushed according to the proportional relation between the inner diameter D1 of the small-diameter section (33) and the inner diameter D2 of the pipeline;
s3: in step S2, the flow velocity of the liquid at the small diameter section (33) is increased, the speed of the liquid cutting magnetic induction line is increased, and the induced electromotive force generated is increased.
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