CN211262342U

CN211262342U - Electromagnetic flowmeter with double-group electrodes

Info

Publication number: CN211262342U
Application number: CN201922476911.2U
Authority: CN
Inventors: 李武泉; 林家军
Original assignee: Youfu Shanghai Intelligent Sensing Technology Co ltd
Current assignee: Youfu Shanghai Intelligent Sensing Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-14
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a have two group electrode electromagnetic flowmeter, through set up first group electrode and second group electrode on the measuring pipeline, first group electrode is connected as the electrode of normal use with the magnetic circuit electricity, and second group electrode is as reserve electrode to, set up the protection film simultaneously on second group electrode as reserve electrode, in order to prevent at first group electrode during operation, second group electrode surface is by non-conductive dirt and influence its performance. Therefore, when the first group of electrodes fails or the surface of the first group of electrodes is covered by non-conductive dirt to influence the failure of the electromagnetic flowmeter, the electromagnetic flowmeter does not need to be replaced or cleaned, the magnetic circuit system is only electrically connected with the second group of electrodes, and the protective film on the second group of electrodes is removed to enable the electromagnetic flowmeter to recover to work, so that the utilization rate of the electromagnetic flowmeter is improved, the first electrodes covered by the non-conductive dirt do not need to be cleaned, and the maintenance time is shortened.

Description

Electromagnetic flowmeter with double-group electrodes

Technical Field

The utility model relates to a mechano-electronic technology field, in particular to have two group electrode electromagnetic flowmeter.

Background

The flowmeter is used for measuring the flow of fluid in a pipeline or an open channel, and is divided into a differential pressure flowmeter, a rotor flowmeter, a throttling flowmeter, a slit flowmeter, a volume flowmeter, an electromagnetic flowmeter, an ultrasonic flowmeter and the like. Classifying according to media: liquid flow meters and gas flow meters, metering being an eye of industrial production. The flow measurement is one of the components of the measurement science and technology, and has close relation with national economy, national defense construction and scientific research. The work is well done, the flowmeter has important effects on ensuring the product quality, improving the production efficiency and promoting the development of scientific technology, and particularly has more obvious status and effect in national economy in the current times that the energy crisis and the industrial production automation degree are higher and higher.

Among them, the electromagnetic flowmeter is a new type of flow meter which has been rapidly developed in the 60 s with the development of electronic technology. It is made up according to Faraday's law of electromagnetic induction and is used for measuring volume flow of measured conductive liquid. Due to its unique advantages, it is widely used in industry for measuring various conductive liquids. For example, various corrosive liquids such as acids, alkalis, and salts, various industrial sewages, pulps, slurries, and the like are measured.

However, in the long-term operation of the electromagnetic flowmeter, a layer of non-conductive dirt can be formed on the surface of the electrode to influence the electrode signal. Particularly, when measuring fluids which are easy to generate dirt and generate attachments, such as media of slurry, sewage and the like, dirt is attached to the surface of an electrode, so that the output of an instrument swings and drifts, and the measurement cannot be carried out in serious cases. At this moment, just need the instrument maintainer to clear up the electrode, the clearance of traditional mode needs the cutoff to carry out after dismantling the flowmeter, has both influenced the normal operating of whole operating mode, has consumed a large amount of manpower and materials again, has increased the maintenance cost of instrument.

Disclosure of Invention

An object of the utility model is to provide a have two group electrode electromagnetic flowmeter to when solving among the current electromagnetic flowmeter electrode inefficacy or because of its surface is covered by non-conductive dirt and influence electromagnetic flowmeter inefficacy, need more trade electromagnetic flowmeter or wash electromagnetic flowmeter, so that the waste of other structures or the problem of the consuming time overlength of clearance among the electromagnetic flowmeter.

In order to solve the technical problem, the utility model provides a have two group electrode electromagnetic flowmeter, include:

a housing;

the measuring pipeline is arranged in the shell so as to enable the measured conductive liquid to pass through, and two ends of the measuring pipeline are respectively connected with a flange used for connecting the measured conductive liquid pipeline;

the magnetic circuit system is used for generating a uniform direct current or alternating current magnetic field, is arranged in the middle of the measuring pipeline and is positioned on the outer wall of the measuring pipeline;

the double-group electrodes are arranged in the measuring pipeline, detection ends of the double-group electrodes respectively penetrate through the side wall of the measuring pipeline and then can be in contact with liquid flowing through the measuring pipeline, and the double-group electrodes are used for leading out induced potential signals in direct proportion to the measured values and comprise a first group of electrodes and a second group of electrodes; the first group of electrodes are electrically connected with the magnetic circuit system, the magnetic circuit system measures the flow of the measured conductive liquid according to the electromotive force induced when the measured conductive liquid passes through an external magnetic field, and the second group of electrodes are provided with protective films which are used for preventing non-conductive dirt from being attached to the second group of electrodes;

a liner disposed on the inside of the metering tube and on the sealing face of the flange to form a complete electrically insulating liner; and

the converter is electrically connected with the magnetic circuit system and is used for amplifying and converting the induced potential signals detected by the electrodes into uniform standard signals and suppressing interference signals;

optionally, in the electromagnetic flowmeter with two groups of electrodes, the protective film is made of a brittle material.

Optionally, in the two-set electrode electromagnetic flowmeter, the lining is made of any one of neoprene, teflon, polyperfluoroethylpropylene, polyurethane rubber, and teflon.

Optionally, in the dual-set electrode electromagnetic flow meter, a material of the casing includes any one of carbon steel or stainless steel.

Optionally, in the dual group electrode electromagnetic flow meter, a first clamping groove is provided on an inner side of the measuring pipe, and the liner and the measuring pipe are connected through the first clamping groove.

Optionally, in the electromagnetic flowmeter with two groups of electrodes, a sealing ring is disposed around each of the first group of electrodes and the second group of electrodes, each of the first group of electrodes and the second group of electrodes is connected to the measurement pipeline through a nut, a gasket and an electrode wire are disposed between each of the nuts and the measurement pipeline, and a shielding cover is sleeved on the outer sides of each of the first group of electrodes and the second group of electrodes.

Optionally, in the dual set electrode electromagnetic flow meter, the sensing ends of the first set of electrodes and the sensing ends of the second set of electrodes are flush with the inner wall of the liner.

Optionally, in the dual-group electrode electromagnetic flowmeter, the measurement pipe and the flange are of a unitary structure.

Optionally, in the dual set electrode electromagnetic flow meter, the dual set electrode electromagnetic flow meter further comprises a display, and the display is connected to the transducer.

Optionally, in the dual-group electrode electromagnetic flowmeter, a second card slot is provided on one side of the transducer, and the display and the transducer are connected through the second card slot.

Compared with the prior art, the utility model has the advantages of:

the first group of electrodes and the second group of electrodes are arranged on the measuring pipeline, the first group of electrodes are electrically connected with the magnetic circuit system to serve as electrodes for normal use, the second group of electrodes serve as backup electrodes, and meanwhile, a protective film is arranged on the second group of electrodes to serve as the backup electrodes, so that the situation that the surfaces of the second group of electrodes are affected by non-conductive dirt when the first group of electrodes work is prevented. Therefore, when the first group of electrodes fails or the surface of the first group of electrodes is covered by non-conductive dirt to influence the failure of the electromagnetic flowmeter, the electromagnetic flowmeter does not need to be replaced or cleaned, the magnetic circuit system is only electrically connected with the second group of electrodes, and the protective film on the second group of electrodes is removed to enable the electromagnetic flowmeter to recover to work, so that the utilization rate of the electromagnetic flowmeter is improved, the first electrodes covered by the non-conductive dirt do not need to be cleaned, and the maintenance time is shortened.

Drawings

Fig. 1 is a front view of a dual set electrode electromagnetic flowmeter according to an embodiment of the present invention;

fig. 2 is a side view of a dual set electrode electromagnetic flowmeter provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a flow pipe provided in an embodiment of the present invention;

fig. 4 is a schematic structural view of a flow pipe with a housing according to an embodiment of the present invention;

fig. 5 is a sectional view taken along line a-a of fig. 4.

Wherein the reference numerals of figures 1-5 are as follows:

10-a converter; 11-a display; 20-a housing; 30-a flow conduit; 40-a flange; 41-mounting holes; 50-a liner; 60-a first set of electrodes; 70-a second set of electrodes; 80-protective film; 90-magnetic circuit system. 91-coil.

Detailed Description

The electromagnetic flowmeter with two groups of electrodes provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the claims and the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The same or similar reference numbers in the drawings identify the same or similar elements.

Referring to fig. 1-5, the present embodiment discloses an electromagnetic flowmeter with two sets of electrodes, comprising: outer shell 20, measuring pipe 30, magnetic circuit 90, double set of electrodes, liner 50 and transducer 10. The measuring pipeline 30 is arranged in the shell 20 so as to allow the measured conductive liquid to pass through, and two ends of the measuring pipeline 30 are respectively connected with a flange 40 used for connecting the measured conductive liquid pipeline; the magnetic circuit system 90 is used for generating a uniform dc or ac magnetic field, and is disposed in the middle of the measuring pipe 30 and on the outer wall of the measuring pipe 30. The two sets of electrodes are disposed in the measuring pipe 30 and include a first set of electrodes and a second set of electrodes, and the detection ends of the first set of electrodes 60 and the second set of electrodes 70 penetrate through the side wall of the measuring pipe 30 and can be in contact with the liquid flowing through the measuring pipe 30 for extracting an induced potential signal proportional to the measured value. The first group of electrodes 60 is electrically connected to the magnetic circuit system 90, the magnetic circuit system 90 measures the flow rate of the conductive liquid to be measured according to the electromotive force induced when the conductive liquid to be measured passes through an external magnetic field, and the second group of electrodes 70 is provided with a protective film 80, wherein the protective film 80 is used for preventing non-conductive dirt from adhering to the second group of electrodes 70. The lining 50 is arranged on the inner side of the measuring pipe 30 and the sealing surface of the flange 40 to form a complete lining 50; the converter 10 is electrically connected to the magnetic circuit system 90, and is configured to amplify and convert the induced potential signal detected by the electrode into a uniform standard signal and suppress a main interference signal.

The magnetic circuit system 90 is used to generate a uniform dc or ac magnetic field. The dc magnetic circuit can be realized by using a permanent magnet, which has the advantages of simple structure and less interference from an ac magnetic field, but it easily polarizes the electrolyte liquid passing through the measuring tube 30, so that the positive electrode is surrounded by negative ions and the negative electrode is surrounded by positive ions, i.e. the polarization phenomenon of the electrodes, and the internal resistance between the two electrodes is increased, thus seriously affecting the normal operation of the instrument. When the diameter of the pipe is large, the permanent magnet is correspondingly large, heavy and uneconomical. The electromagnetic flowmeter preferably employs an alternating magnetic field as the magnetic circuit system 90, which in some embodiments may be generated by energizing a 50HZ mains power supply.

The function of the measuring pipe 30 is to let the measured conductive liquid pass through. In order to shunt or short the magnetic flux when the magnetic lines of force pass through the measuring pipe 30, the measuring pipe 30 must be made of a material which is non-magnetic, low in electrical conductivity, low in thermal conductivity and has a certain mechanical strength, and the material can be selected from non-magnetic stainless steel, glass fiber reinforced plastic, high-strength plastic, aluminum and the like.

The electrode functions to extract an induced potential signal proportional to the measured quantity. The electrodes are typically made of non-magnetic stainless steel and are required to be flush with the liner 50 so that fluid passage is not impeded. It is preferably installed in a vertical direction of the pipe to prevent deposits from being accumulated thereon to affect the measurement accuracy.

Liner 50 has a complete liner 50 on the inside of measuring pipe 30 and on the sealing surface of flange 40. Since liner 50 is in direct contact with the fluid being measured, it acts to increase the corrosion resistance of measurement pipe 30 and prevent induced electrical potentials from being shorted by the walls of metal measurement pipe 30. The lining 50 is made of a material that is resistant to corrosion, high temperature, and abrasion. Wherein, the lining 50 can be made of one of neoprene, polytetrafluoroethylene, fluorinated ethylene propylene, polyurethane rubber or teflon. The lining 50 thus functions as an electrical insulator and protects the inner wall of the measuring pipe 30 from corrosion.

The induced potential signal generated by the liquid flow in the converter 10 is very weak and is greatly influenced by various interference factors, and the converter 10 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 the induced potential signal detected by the electrode into a uniform standard direct current signal.

Wherein the sensing ends of the first set of electrodes 60 and the second set of electrodes 70 are flush with the inner wall of the liner 50. And, sealing rings are arranged around the first group of electrodes 60 and the second group of electrodes 70, the first group of electrodes 60 and the second group of electrodes 70 are connected to the measuring pipe 30 through nuts, a gasket (not shown) and an electrode lead (not shown) are arranged between the nuts and the measuring pipe 30, and shielding covers (not shown) are sleeved outside the first group of electrodes 60 and the second group of electrodes 70 to reduce interference.

Specifically, the magnetic circuit system 90 includes a coil 91, the coil 91 is disposed on the outer surface of the measuring pipe 30, the coil 91 is electrically connected to the transducer 10, and the coil 91 is located between the measuring pipe 30 and the casing 20, the casing 20 can prevent the structure inside the casing 20 from being corroded, and a potting layer is provided inside the casing 20 and the coil 91 to achieve a complete sealing effect, so that the casing 20 and the coil 91 are completely isolated. The advantage of this setting is that even the shell 20 receives the corruption, can not influence its inboard structure, has improved the life of electromagnetic flowmeter, through install glass steel layer (not shown in the figure) and glass scale layer (not shown in the figure) in the inside of protecting casing 20, improves the corrosion resisting property of protecting casing 20, further improves the life of device.

By arranging the first group of electrodes 60 and the second group of electrodes 70 on the measuring pipe 30, the first group of electrodes 60 is electrically connected with the magnetic circuit system 90 as the electrodes for normal use, the second group of electrodes 70 is used as the backup electrodes, and meanwhile, the protective film 80 is arranged on the second group of electrodes 70 to be used as the backup electrodes, so that the surfaces of the second group of electrodes 70 are prevented from being polluted by non-conductive dirt to affect the performance of the first group of electrodes 60 when the first group of electrodes 60 works. Therefore, when the first group of electrodes 60 fails or the electromagnetic flowmeter fails due to the fact that the surface of the first group of electrodes is covered by non-conductive dirt, the electromagnetic flowmeter can be recovered to work only by electrically connecting the magnetic circuit system 90 with the second group of electrodes 70 and removing the protective film 80 on the second group of electrodes 70, and the purpose of recovering the electromagnetic flowmeter without replacing the electromagnetic flowmeter or cleaning the electromagnetic flowmeter is achieved. Therefore, the utilization rate of the electromagnetic flowmeter is improved, the first electrode covered by non-conductive dirt does not need to be cleaned, and the maintenance time is shortened.

The working principle of the double-group electrode electromagnetic flowmeter is as follows: when the device is used, the flange 40 is connected with an external conductive liquid pipeline to be detected through a bolt, the bolt penetrates through the mounting hole 41 and extends to the outer side of the mounting hole 41, the bolt and the flange 40 are fixed through a nut and are connected with a power supply, after the converter 10 is electrified, exciting current is output to the coil 91, so that the coil 91 generates a magnetic field to form a magnetic induction line, a conductive medium flows through the fluid bin and does cutting magnetic induction line movement through the magnetic field, the medium has an electromotive force signal, the electromotive force signal is transmitted to the converter 10 through the first group of electrodes 60, the converter 10 amplifies the signal, the flow speed and the flow are calculated, and the flow speed and the flow are displayed through the display screen 11. Further, when the first set of electrodes 60 fails or the electromagnetic flowmeter fails due to the fact that the surface of the first set of electrodes is covered by non-conductive dirt, the magnetic circuit system 90 is only required to be electrically connected with the second set of electrodes 70, so that the electromagnetic flowmeter can be restored to work without replacing or cleaning the electromagnetic flowmeter. After the second set of electrodes 70 is activated, the working principle of the electromagnetic flowmeter is the same as that of the first set of electrodes 60, and thus the description is omitted here.

Preferably, the protective film 80 is made of a brittle material, wherein the brittle material is capable of being broken or broken when an external force (100N-500N) impacts, for example, a calcium carbonate material is used to make the protective film 80. Thus, the protective film 80 prevents the surface of the second group of electrodes 70 from being contaminated by non-conductive dirt when the first group of electrodes 60 works, and the protective film 80 made of brittle material is broken when the second group of electrodes 70 needs to be started, so that the second group of electrodes 70 can be started conveniently.

Wherein the housing 20 is made of one of carbon steel or stainless steel, and the housing 20 is an outer cover of the distribution system excitation coil 91 and isolates interference of an external magnetic field.

Further, a first clamping groove is formed on the inner side of the measuring pipe 30, and the lining 50 is connected with the measuring pipe 30 through the first clamping groove. The measuring pipe 30 and the flange 40 are of an integral structure.

The electromagnetic flowmeter with two groups of electrodes further comprises a display 11, and the display 11 is connected with the converter 10. One side of the converter 10 is provided with a second card slot, and the display 11 and the converter 10 are connected through the second card slot, so that the firmness of the display 11 can be ensured.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. A dual set electrode electromagnetic flowmeter comprising:

a housing;

a liner disposed on the inside of the pipe and on the sealing face of the flange to form a complete electrically insulating liner; and

and the converter is electrically connected with the magnetic circuit system and is used for amplifying and converting the induced potential signals detected by the double groups of electrodes into uniform standard signals and suppressing interference signals.

2. The dual set electrode electromagnetic flowmeter of claim 1, wherein said protective membrane is made of a brittle material.

3. The dual set electrode electromagnetic flowmeter of claim 1, wherein said liner comprises any of neoprene rubber, polytetrafluoroethylene, polyfluoroethylene propylene, urethane rubber, or teflon.

4. The dual set electrode electromagnetic flowmeter of claim 1, wherein said housing comprises any of carbon steel or stainless steel.

5. The dual set electrode electromagnetic flowmeter of claim 1, wherein said measurement pipe is provided with a first bayonet slot on an inside thereof, said liner and said measurement pipe being connected by said first bayonet slot.

6. The flowmeter with two sets of electrodes as set forth in claim 1, wherein a seal ring is disposed around each of said first set of electrodes and said second set of electrodes, said first set of electrodes and said second set of electrodes are connected to said measurement pipe by a nut, a gasket and an electrode lead are disposed between said nut and said measurement pipe, and a shielding cover is disposed on the outer side of each of said first set of electrodes and said second set of electrodes.

7. The dual set electrode electromagnetic flowmeter of claim 1 wherein said sensing ends of said first set of electrodes and said sensing ends of said second set of electrodes are flush with said inner wall of said liner.

8. The dual set electrode electromagnetic flowmeter of claim 1 wherein said measurement conduit is a unitary structure with said flange.

9. The dual set electrode electromagnetic flow meter of claim 1 further comprising a display, said display being connected to said transducer.

10. The dual set electrode electromagnetic flowmeter of claim 9, wherein a second card slot is provided on one side of said transducer, said display and said transducer being connected through said second card slot.