CN209927194U - High-precision electromagnetic water meter - Google Patents
High-precision electromagnetic water meter Download PDFInfo
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- CN209927194U CN209927194U CN201920766277.3U CN201920766277U CN209927194U CN 209927194 U CN209927194 U CN 209927194U CN 201920766277 U CN201920766277 U CN 201920766277U CN 209927194 U CN209927194 U CN 209927194U
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Abstract
The utility model belongs to the flow metering instrument field, concretely relates to high accuracy electromagnetic water meter, measuring tube adopt the tetrafluoro material, measuring tube's middle part is the rectangle pipeline, and the rectangle pipeline divide into long limit internal face and minor face internal face, and flow measurement electrode installs on the minor face internal face and runs through measuring tube's wall, has the coil mounting groove that is used for installing excitation coil of two relative settings on measuring tube's the outer wall, and the bottom surface of coil mounting groove is parallel with long limit internal face. The rectangular pipeline enables the distance between the two oppositely arranged magnet exciting coils to be closer, the magnetic field intensity is increased, the distance between the two oppositely arranged flow measuring electrodes is larger, and the measuring precision of the electromagnetic water meter is improved. The traditional lining and the measuring guide pipe are directly designed into a whole, the measuring guide pipe is directly made of a tetrafluoro material, and the excitation coil is directly arranged inside the measuring guide pipe.
Description
Technical Field
The utility model belongs to the technical field of instrument and meter, concretely relates to high accuracy electromagnetism water gauge.
Background
The electromagnetic water meter is an instrument which measures the flow of a conductive fluid according to the electromotive force induced when the conductive fluid passes through an external magnetic field by applying the electromagnetic induction principle. The structure of the electromagnetic water meter mainly comprises a magnetic circuit system, a measuring conduit, an electrode, a shell, a lining, a converter and the like.
A magnetic circuit system: the function is to generate a uniform dc or ac magnetic field. The DC magnetic circuit is realized by a permanent magnet, has the advantages of simple structure and small interference by an AC magnetic field, but is easy to polarize electrolyte liquid in a measuring conduit, so that a positive electrode is surrounded by negative ions, a negative electrode is surrounded by positive ions, namely the polarization phenomenon of the electrodes, and internal resistance between the two electrodes is increased, thereby seriously influencing the normal work of the instrument. When the diameter of the pipeline is larger, the permanent magnet is correspondingly larger, heavy and uneconomical, so the electromagnetic water meter generally adopts an alternating magnetic field and is generated by the excitation of a 50HZ power frequency power supply.
A measuring catheter: the function is to let the measured conductive liquid pass through. In order to shunt or short-circuit magnetic flux when magnetic lines of force pass through the measuring conduit, the measuring conduit must be made of materials which are non-magnetic, low in electric conductivity, low in thermal conductivity and have certain mechanical strength, and the non-magnetic stainless steel, glass fiber reinforced plastic, high-strength plastic, aluminum and the like can be selected.
Lining: an integral electrically insulating lining is provided on the inner side of the measuring tube and on the flange sealing face. The metal measuring conduit directly contacts with the measured liquid, and has the functions of increasing the corrosion resistance of the measuring conduit and preventing the induced potential from being short-circuited by the wall of the metal measuring conduit. The lining materials are mostly polytetrafluoroethylene plastics, ceramics and the like which are corrosion-resistant, high-temperature resistant and wear-resistant.
An electrode: its function is to extract an induced potential signal proportional to the measured quantity. The electrodes are typically made of non-magnetic stainless steel and are preferably mounted in a position perpendicular to the pipe to prevent deposits from accumulating thereon and affecting the accuracy of the measurement.
A housing: the magnetic field shielding device is made of ferromagnetic materials, is an outer cover of a distribution system excitation coil, and isolates the interference of an external magnetic field.
A converter: the induced potential signal generated by the liquid flow is very weak and is greatly influenced by various interference factors, and the converter is used for amplifying and converting the induced potential signal into a uniform standard signal and inhibiting a main interference signal. The task is to amplify and convert an induced potential signal Ex detected by the electrode into a uniform standard direct current signal.
The conductor cutting electromagnetic field generates induced electromotive force, and the specific formula is as follows:
wherein B-magnetic induction, D-conductor length, dl-moving distance, it can be seen that the induced electromotive force is in direct proportion to the magnetic induction and the conductor length, the principle is applied to the electromagnetic water meter, and the accuracy of the electromagnetic water meter is in direct proportion to the magnetic induction and the distance between two opposite measuring electrodes.
The magnet exciting coil of most magnetic circuit systems of the existing electromagnetic water meter is arranged outside the measuring guide pipe, a lining is required to be arranged inside the measuring guide pipe, the installation process is complex, and the measuring part of the electromagnetic water meter is large in size, not compact in structure and high in cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defect that the requirement that exists among the prior art and need constantly improve measurement accuracy and the mounting process is complicated, providing a high and compact structure of measurement accuracy, simple to operate's high accuracy electromagnetic water meter.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a high accuracy electromagnetism water gauge, includes measuring guide, excitation coil and electrode, its characterized in that: the utility model discloses a measuring pipe, including measuring pipe, flow measurement electrode, measuring pipe adopts the tetrafluoro material, measuring pipe's middle part is the rectangle pipeline, the rectangle pipeline divide into long limit internal face and minor face internal face, and flow measurement electrode installs on the minor face internal face and run through measuring pipe's wall, the outer wall of measuring pipe has two relative settings be used for the installation exciting coil's coil mounting groove, the bottom surface of coil mounting groove with long limit internal face is parallel.
Further, the electrodes further comprise a ground pole which is installed on the inner wall surface of the long side and penetrates through the wall surface of the measuring guide pipe, and an empty and full pipe detection electrode which is arranged opposite to the ground pole and installed on the inner wall surface of the other long side.
Further, the long side L of the rectangular pipeline is 1.2-2.5 times of the short side S of the rectangular pipeline.
Furthermore, the outer wall surface of the measuring conduit is provided with two oppositely arranged electrode installation grooves for installing the flow measuring electrodes, and the bottom of each electrode installation groove is provided with a first through hole.
Further, the electrode comprises an electrode screw rod, an electrode gasket and an electrode nut, the electrode screw rod penetrates out of the inner wall surface of the measuring guide pipe to the electrode mounting groove, the electrode gasket is tightly attached to the bottom surface of the electrode mounting groove and sleeved on the electrode screw rod, and the electrode nut is sleeved on the electrode screw rod on the outer side of the electrode gasket.
Furthermore, the bottom surface of the coil mounting groove is provided with a second through hole penetrating through the inner wall surface of the measuring guide pipe, the electrode screw rod penetrates out of the inner wall surface of the measuring guide pipe to the electrode mounting groove, and the electrode gasket is tightly attached to the bottom surface of the coil mounting groove and sleeved on the electrode screw rod.
Furthermore, countersunk grooves are formed in the ends, close to the rectangular pipeline, of the first through hole and the second through hole, and one ends, installed inside the measuring guide pipes, of the electrode screw rods are installed in the countersunk grooves.
Furthermore, both ends of the measuring catheter are provided with drainage guide surfaces which are connected with the rectangular pipeline.
The utility model discloses a high accuracy electromagnetic water meter's beneficial effect is:
1. the utility model discloses break the thought that traditional measuring catheter middle part is circular pipeline, design into rectangular pipeline, make the distance between the excitation coil of two relative settings more closely, increase magnetic field intensity, the distance between the flow measurement electrode of two relative settings is bigger simultaneously, and measuring response electromotive force is bigger like this, has improved electromagnetic water meter's measurement accuracy.
2. The utility model discloses do not set up the inside lining, directly with traditional inside lining and measuring pipe design as an organic whole, measuring pipe directly adopts the tetrafluoro material to set up electrode mounting groove and coil mounting groove on measuring pipe, excitation coil direct mount is inside measuring pipe, the modularized design, compact structure, small, simplified mounting process and practiced thrift manufacturing cost.
3. The electrode screw is arranged in the countersunk head groove, so that the smoothness of the inner wall surface of the measuring conduit is ensured, the factor blocking water flow is eliminated, and the measuring precision of the electromagnetic water meter is further improved.
4. The drainage guide surfaces connected with the rectangular pipeline are arranged at the two ends of the measuring guide pipe to drain water flow, so that the speed change of the water flow after the water flow touches the water meter is reduced as much as possible, and the measuring precision of the water meter is further improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is a front view of an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is a perspective view of a measurement catheter.
In the figure: 1. the measuring device comprises a measuring guide pipe, 11, a rectangular pipeline, 12, long-side inner wall surfaces, 13, short-side inner wall surfaces, 14, a coil mounting groove, 15, an electrode mounting groove, 16, a first through hole, 17, a second through hole, 18, a countersunk groove, 19, a drainage guide surface, 2, an excitation coil, 3, an electrode, 31, an electrode screw rod, 32, an electrode gasket, 33, an electrode nut, 34, a flow measuring electrode, 35, a ground electrode, 36 and an empty and full pipe measuring electrode. Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Fig. 1-4 show the utility model discloses a specific embodiment of a high accuracy electromagnetic water meter, including measuring pipe 1, excitation coil 2 and electrode 3, measuring pipe 1 adopts the tetrafluoro material, measuring pipe 1's middle part is rectangle pipeline 11, rectangle pipeline 11 divide into long limit internal face 12 and minor face internal face 13, flow measurement electrode 34 installs on minor face internal face 13 and runs through measuring pipe 1's wall, the coil mounting groove 14 that is used for installing excitation coil 2 that has two relative settings on measuring pipe 1's the outer wall, the bottom surface of coil mounting groove 14 is parallel with long limit internal face 12.
In the present embodiment, the flow measurement device includes four electrodes 3, two flow measurement electrodes 34 mounted on the short-side inner wall surface 13 in an opposed manner, a ground electrode 35 mounted on the long-side inner wall surface 12 and penetrating the wall surface of the measurement duct 1, and a full-pipe detection electrode 36 mounted on the other long-side inner wall surface 12 in an opposed manner to the ground electrode 35. When fluid passes through the internal cutting magnetic induction line of the measuring conduit 1, a potential difference is generated between the two flow measuring electrodes 34, and the flow of the fluid can be measured. When there is no potential difference between the empty pipe detection electrode 36 and the ground level, no fluid flows through the measurement conduit 1 representing the electromagnetic water meter.
In a preferred embodiment, the long side L of the rectangular duct 11 is 1.2 to 2.5 times the short side S.
In this embodiment, the outer wall surface of the measuring tube 1 has two oppositely disposed electrode mounting grooves 15 for mounting the flow measuring electrodes 34, and the bottom of the electrode mounting groove 15 has a first through hole 16. The two electrode mounting grooves 15 are used for mounting a ground electrode 35 and an empty pipe detection electrode 36 respectively, the two flow measurement electrodes 34 are mounted in the two coil mounting grooves 14, and the exciting coil 2 is sleeved outside the flow measurement electrodes 34.
In this embodiment, the electrode 3 includes an electrode screw 31, an electrode gasket 32 and an electrode nut 33, the electrode screw 31 penetrates out of the inner wall surface of the measuring guide tube 1 to the electrode mounting groove 15, the electrode gasket 32 is sleeved on the electrode screw 31 by being closely attached to the bottom surface of the electrode mounting groove 15, and the electrode nut 33 is sleeved on the electrode screw 31 outside the electrode gasket 32.
The bottom surface of the coil mounting groove 14 is provided with a second through hole 17 penetrating through the inner wall surface of the measuring guide pipe 1, the electrode screw 31 penetrates out of the inner wall surface of the measuring guide pipe 1 to the electrode mounting groove 15, the electrode gasket 32 is sleeved on the electrode screw 31 closely attached to the bottom surface of the coil mounting groove 14, the electrode nut 33 is sleeved on the electrode screw 31 outside the electrode gasket 32, and a lead is screwed between the electrode gasket 32 and the electrode nut 33.
In this embodiment, the ends of the first through hole 16 and the second through hole 17 close to the rectangular pipe 11 are provided with countersunk grooves 18, and the ends of the electrode screws 31 installed inside the measuring catheter 1 are installed in the countersunk grooves 18. The electrode screw 31 is arranged in the countersunk head groove 18, so that the smoothness of the inner wall surface of the measuring conduit 1 is ensured, the factor of blocking water flow is eliminated, and the measuring precision of the electromagnetic water meter is further improved.
In order to further improve the measurement accuracy, the two ends of the measuring catheter 1 are provided with drainage guide surfaces 19 which are connected with the rectangular pipeline 11 and are used for guiding the water flow, so that the speed change of the water flow after the water flow contacts the water meter is reduced as much as possible.
The utility model discloses break the thought that traditional measuring catheter 1 middle part is circular pipeline, design into rectangular pipeline 11, it is more nearly to make the distance between two relative excitation coil 2 that set up, increase magnetic field intensity, and the distance between two flow measurement electrodes 34 that set up relatively is bigger simultaneously, and according to the induced electromotive force mentioned in this patent background art with magnetic induction intensity and conductor length directly proportional, measured induced electromotive force is bigger like this, has improved electromagnetic water meter's measurement accuracy.
The utility model discloses do not set up the inside lining, directly with traditional inside lining and measuring pipe design as an organic whole, measuring pipe 1 directly adopts the tetrafluoro material to set up electrode mounting groove 15 and coil mounting groove 14 on measuring pipe 1, excitation coil 2 direct mount is inside measuring pipe 1, the modularized design, compact structure, small, simplified mounting process and practiced thrift manufacturing cost.
It should be understood that the above description of the specific embodiments is only for the purpose of explanation and not for the purpose of limitation. Obvious changes or variations caused by the spirit of the present invention are within the scope of the present invention.
Claims (8)
1. The utility model provides a high accuracy electromagnetism water gauge, includes measuring guide pipe (1), excitation coil (2) and electrode (3), its characterized in that: measuring tube (1) adopts the tetrafluoro material, the middle part of measuring tube (1) is rectangle pipeline (11), rectangle pipeline (11) divide into long limit internal face (12) and minor face internal face (13), and flow measurement electrode (34) are installed on minor face internal face (13) and run through the wall of measuring tube (1), it has two relative settings to be used for the installation on the outer wall of measuring tube (1) coil mounting groove (14) of excitation coil (2), the bottom surface of coil mounting groove (14) with long limit internal face (12) are parallel.
2. A high accuracy electromagnetic water meter as set forth in claim 1, wherein: the electrode (3) further comprises a ground pole (35) which is arranged on the inner wall surface (12) of the long side and penetrates through the wall surface of the measuring guide pipe (1), and an empty and full pipe detection electrode (36) which is arranged opposite to the ground pole (35) and is arranged on the inner wall surface (12) of the other long side.
3. A high accuracy electromagnetic water meter as set forth in claim 1, wherein: the long side L of the rectangular pipeline (11) is 1.2-2.5 times of the short side S of the rectangular pipeline.
4. A high accuracy electromagnetic water meter as set forth in claim 2, wherein: the outer wall surface of the measuring conduit (1) is provided with two oppositely arranged electrode mounting grooves (15) for mounting the flow measuring electrodes (34), and the bottom of each electrode mounting groove (15) is provided with a first through hole (16).
5. A high accuracy electromagnetic water meter as set forth in claim 4, wherein: the electrode (3) comprises an electrode screw rod (31), an electrode gasket (32) and an electrode nut (33), the electrode screw rod (31) penetrates out of the inner wall surface of the measuring guide pipe (1) to the electrode mounting groove (15), the electrode gasket (32) is tightly attached to the bottom surface of the electrode mounting groove (15) and sleeved on the electrode screw rod (31), and the electrode nut (33) is sleeved on the electrode screw rod (31) on the outer side of the electrode gasket (32).
6. A high accuracy electromagnetic water meter as set forth in claim 5, wherein: the bottom surface of the coil mounting groove (14) is provided with a second through hole (17) penetrating through the inner wall surface of the measuring guide pipe (1), the electrode screw (31) penetrates out of the inner wall surface of the measuring guide pipe (1) to the electrode mounting groove (15), and the electrode gasket (32) is tightly attached to the bottom surface of the coil mounting groove (14) and sleeved on the electrode screw (31).
7. A high accuracy electromagnetic water meter as set forth in claim 6, wherein: one ends of the first through hole (16) and the second through hole (17) close to the rectangular pipeline (11) are respectively provided with a countersunk groove (18), and one end of the electrode screw (31) installed inside the measuring conduit (1) is installed in the countersunk groove (18).
8. A high accuracy electromagnetic water meter as set forth in any one of claims 1-7, wherein: and both ends of the measuring catheter (1) are provided with drainage guide surfaces (19) connected with the rectangular pipeline (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920766277.3U CN209927194U (en) | 2019-05-24 | 2019-05-24 | High-precision electromagnetic water meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920766277.3U CN209927194U (en) | 2019-05-24 | 2019-05-24 | High-precision electromagnetic water meter |
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| CN209927194U true CN209927194U (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081940A (en) * | 2019-05-24 | 2019-08-02 | 江苏鑫华禹测控技术有限公司 | A kind of high-precision electromagnetism water meter |
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- 2019-05-24 CN CN201920766277.3U patent/CN209927194U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081940A (en) * | 2019-05-24 | 2019-08-02 | 江苏鑫华禹测控技术有限公司 | A kind of high-precision electromagnetism water meter |
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