CN107219267B - Industrial flow type low-conductivity electrode graphite sensor - Google Patents
Industrial flow type low-conductivity electrode graphite sensor Download PDFInfo
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- CN107219267B CN107219267B CN201710412842.1A CN201710412842A CN107219267B CN 107219267 B CN107219267 B CN 107219267B CN 201710412842 A CN201710412842 A CN 201710412842A CN 107219267 B CN107219267 B CN 107219267B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
Abstract
The industrial flow type low-conductivity electrode graphite sensor comprises an inner graphite electrode, an outer graphite electrode, an isolation column, an outer electrode binding post, an inner electrode binding post, a flow guide pipe and a temperature probe, wherein the inner graphite electrode is embedded into the outer graphite electrode, an annular gap exists between the outer surface of the inner graphite electrode and the inner surface of the outer graphite electrode, the isolation column which is insulated and corrosion-resistant is arranged in the annular gap between the outer graphite electrode and the inner graphite electrode, the outer graphite electrode, the isolation column and the inner graphite electrode are coaxially arranged, the isolation column is in sealing connection with the outer graphite electrode and the inner graphite electrode, the temperature probe and the inner electrode binding post are arranged on one section of the upper end face of the isolation column, the outer electrode binding post is arranged on the outer surface of the outer graphite electrode, and the flow guide pipe is arranged on the outer surface of the outer graphite electrode and is communicated with the annular gap. The invention has the advantages of high measurement precision, simple structure and the like, and belongs to the technical field of conductive electrodes.
Description
Technical Field
The invention belongs to the technical field of conductive electrodes, and particularly relates to an industrial flow type low-conductivity electrode graphite sensor which is specially used for detecting the conductivity of electrolyte solution with low conductivity.
Background
Conductivity is a fundamental electrochemical parameter of an electrolyte solution. Currently, the measurement of conductivity is most widespread to use electrode conductivity methods. The conventional two-conductivity electrode is composed of a pair of plate electrodes or cylinders, which are mostly made of metal materials and are provided with sampling grooves. However, the metal sampling slot has the problem of electricity leakage, and the plastic sampling slot has the problem of shielding, so that the measurement accuracy of conductivity is lower. The existing four-electrode, five-electrode and seven-electrode structures are complex, and particularly when manufacturing the low-electrode constant electrode, the mounting accuracy limitation and the manufacturing difficulty are caused by reducing the electrode measuring distance, and the manufacturing cost is greatly increased by increasing the conductive area.
Disclosure of Invention
Aiming at the problems, the invention provides the industrial flow type low-conductivity electrode graphite sensor with high measurement precision and simple structure.
The industrial flow type low-conductivity electrode graphite sensor comprises an inner graphite electrode, an outer graphite electrode, an isolation column, an outer electrode binding post, an inner electrode binding post, a flow guide pipe and a temperature probe, wherein the inner graphite electrode is embedded into the outer graphite electrode, an annular gap exists between the outer surface of the inner graphite electrode and the inner surface of the outer graphite electrode, the isolation column which is insulated and corrosion-resistant is arranged in the annular gap between the outer graphite electrode and the inner graphite electrode, the outer graphite electrode, the isolation column and the inner graphite electrode are coaxially arranged, the isolation column is in sealing connection with the outer graphite electrode and the inner graphite electrode, the temperature probe and the inner electrode binding post are arranged on one section of the upper end face of the inner graphite electrode extending out of the isolation column, the outer electrode binding post is arranged on the outer surface of the outer graphite electrode, the flow guide pipe is installed on the outer surface of the outer graphite electrode in an inserted mode and is communicated with the annular gap, and the joint of the flow guide pipe and the outer graphite electrode on the inner surface of the outer graphite electrode is located below the lower end face of the isolation column. By adopting the structure, the precision of measuring the conductivity of the electrolyte solution with low conductivity is higher, the structure is simple, and the electrolyte solution with low conductivity is corrosion-resistant and durable.
Preferably, the flow guide pipe is vertically arranged on the outer surface of the outer graphite electrode or the flow guide pipe is obliquely arranged on the outer surface of the outer graphite electrode upwards. By adopting the structure, the highest point of the detected fluid in the detection channel at the joint of the guide pipe and the inner surface of the outer graphite electrode is ensured, so that the liquid and the gas can flow smoothly in the detection channel.
Preferably, the lower end face of the isolation column is an inclined plane, and the height difference of the inclined plane is equal to the diameter of the flow guide pipe. The angle of the lower end face of the spacer column to the horizontal is about 18 degrees. With this structure, even if the liquid flows out, no large disturbance is generated.
Preferably, the outer graphite electrode is a graphite tube, the inner graphite electrode is a graphite column, the isolation column is an insulating and corrosion-resistant plastic tube, the graphite tube, the plastic tube and the graphite column are coaxially arranged, the lower end face of the inner graphite electrode is flush with the lower end face of the outer graphite electrode, the upper end face of the isolation column is flush with the upper end face of the outer graphite electrode, and the upper end of the inner graphite electrode extends out of the upper end face of the isolation column. By adopting the structure, the materials are easy to obtain, the installation is simple, and the detection channel is long so as to meet the measurement requirement.
Preferably, the temperature probe is mounted on the top surface of the upper end of the inner graphite electrode, and the inner electrode binding post is mounted on the outer cylindrical surface of a section of the upper end surface of the inner graphite electrode extending out of the isolation column. By adopting the structure, wires externally connected with other components are easy to distinguish, and the wiring is simple.
Preferably, the temperature probe is model LM35DZ. With this structure, the precision is high and the power consumption is low.
Preferably, the graphite electrode further comprises an internal threaded connection pipe and a Y-shaped filter, wherein the upper end of the internal threaded connection pipe is connected with the lower end of the external graphite electrode, and the Y-shaped filter is connected with the lower end of the internal threaded connection pipe. By adopting the structure, the Y-shaped filter can filter out impurities in the liquid, prevent scaling, increase working time and facilitate disassembly, installation and cleaning of the filter.
Preferably, the isolation column is in sealing connection with the inner graphite electrode and the outer graphite electrode by adopting corrosion-resistant glue. The adopted corrosion-resistant glue is resin glue, the specific model is Lantian 9940 temperature-resistant AB glue, and the adhesive is characterized by high temperature resistance, high water resistance, firm glue layer, rapid solidification in 40 minutes, temperature resistance of-59-280 ℃, water resistance, oil resistance and acid-base resistance. By adopting the structure, the isolation column can be easily and firmly arranged between the inner graphite electrode and the outer graphite electrode, and the structure is simple in manufacture, low in cost and easy to control.
Preferably, the isolation column and the flow guide pipe are made of polytetrafluoroethylene materials. With this construction, corrosion resistance and insulation can be achieved, and fluid corrosion and scale deposition can be prevented.
Preferably, the temperature probe comprises a shell device, a temperature probe cable connected with the temperature probe and an electrode cable connected with an inner electrode binding post and an outer electrode binding post, wherein the shell device is made of metal, is grounded and comprises an upper cover plate, a lower cover plate, a left cover plate and a right groove plate, an inner graphite electrode, an outer graphite electrode, an isolation column, the outer electrode binding post, the inner electrode binding post and a guide pipe are all arranged in the right groove plate, the temperature probe cable and the electrode cable extend out of an outlet hole of the upper cover plate arranged above the right groove plate, the guide pipe extends out of an outlet hole of the right groove plate, a Y-shaped filter penetrates through an inlet pipe hole arranged on the lower cover plate below the right groove plate and is connected with the lower end of an inner threaded connector, and the left cover plate is arranged on the left side of the right groove plate. By adopting the structure, the inner graphite electrode and the outer graphite electrode can be protected, and the anti-interference capability of the device is improved.
The invention has the advantages that:
1. the inner graphite electrode is embedded into the outer graphite electrode, and the isolation column made of polytetrafluoroethylene is arranged in the annular gap so as to block the unblocked annular gap, and the diversion pipe communicated with the annular gap is arranged on the outer graphite electrode so as to form a detection channel, so that the structure is simple, the measurement is also simple, and the measurement precision is high.
2. The Y-shaped filter is arranged below the outer graphite electrode, and before fluid enters the annular gap, the fluid is filtered through the Y-shaped filter, so that impurities in the detection liquid can be filtered, scaling is prevented, the working time is prolonged, and the filter is easy to detach, install and clean.
3. The flow guide pipe is perpendicular to the outer cylindrical surface of the outer graphite electrode or is obliquely arranged on the outer cylindrical surface of the outer graphite electrode upwards, so that the highest point of the detected fluid in the detection channel at the joint of the flow guide pipe and the inner surface of the outer graphite electrode is ensured, and therefore, the fluid and the gas can smoothly flow in the detection channel.
4. The lower terminal surface of insulated column is the inclined plane, and the difference in height on inclined plane equals the diameter of honeycomb duct, consequently even liquid outflow also can not produce great disturbance, guarantees measurement process's stability and accuracy.
5. The inner graphite electrode and the outer graphite electrode are arranged in the grounded metal shell device, so that the inner graphite electrode and the outer graphite electrode can be protected, and the anti-interference capability of the device is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of the invention not including a housing means.
Fig. 2 is a schematic perspective view of an embodiment of the invention not including a housing arrangement.
Fig. 3 is an assembled schematic view of an embodiment of the present invention.
Wherein, 1 is temperature probe, 2 is interior graphite electrode, 3 is interior electrode terminal, 4 is the spacer column, 5 is outer graphite electrode, 6 is outer electrode terminal, 7 is the internal thread take-over, 8 is Y filter, 9 is the honeycomb duct, 10 is the upper cover plate, 11 is right frid, 12 is the lower cover plate, 13 is left apron.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the industrial flow type low-conductivity electrode graphite sensor comprises an inner graphite electrode, an outer graphite electrode, an isolation column, an outer electrode binding post, an inner electrode binding post, a honeycomb duct, an inner screwed connection pipe, a Y-shaped filter and a temperature probe. The outer graphite electrode is a graphite tube, the inner graphite electrode is a graphite column, the outer diameter of the inner graphite electrode is smaller than the inner diameter of the outer graphite electrode, and the inner graphite electrode is longer than the outer graphite electrode. The inner graphite electrode is embedded into the outer graphite electrode, an annular gap exists between the outer surface of the inner graphite electrode and the inner surface of the outer graphite electrode, the lower end face of the inner graphite electrode is flush with the lower end face of the outer graphite electrode, the upper end of the inner graphite electrode extends out of the upper end of the graphite tube, and the upper end face of the inner graphite electrode is higher than the upper end face of the outer graphite electrode by a section. The inner graphite electrode and the outer graphite electrode are made of impermeable graphite materials. In this embodiment, the isolation column is shorter, and the isolation column is the plastic tubing of making by polytetrafluoroethylene, and the internal diameter of plastic tubing equals with the external diameter of graphite post, and the external diameter of plastic tubing equals with the internal diameter of graphite pipe, and the lower terminal surface of isolation column is the inclined plane, and the difference in height of inclined plane equals the diameter of honeycomb duct, and the up end of isolation column is the plane. The isolating column is arranged between annular gaps of the inner graphite electrode and the outer graphite electrode, the isolating column is connected with the inner graphite electrode, the isolating column and the outer graphite electrode together through corrosion-resistant glue in a sealing mode, the upper end face of the isolating column after installation is flush with the upper end face of the outer graphite electrode, and the isolating column after installation blocks the upper end of the annular gap. The isolation column, the inner graphite electrode and the outer graphite electrode are coaxial after installation, and the isolation column plays a role in coaxially fixing the inner graphite electrode and the outer graphite electrode. The temperature probe with the model of LM35DZ is arranged on the top surface of the upper end of the inner graphite electrode, and an inner electrode binding post is arranged on the outer cylindrical surface of one section of the upper end surface of the inner graphite electrode, which extends out of the isolation column. The outer cylindrical surface of the outer graphite electrode is provided with a side through hole penetrating the inner surface and the outer surface of the graphite tube, the guide tube is inserted into the side through hole and is in sealed connection with the outer graphite electrode through corrosion-resistant glue, the guide tube is obliquely arranged on the outer graphite electrode upwards (the backflow tube can also be vertically arranged on the outer graphite electrode), and the guide tube is communicated with the annular gap; therefore, the liquid and the gas can smoothly flow in the detection channel formed by the annular space, the flow guide pipe and the like. The highest point of the flow guide pipe at the section of the inner surface of the outer graphite electrode (the joint) is connected with the highest point of the lower end surface of the isolation column, the diameter of the flow guide pipe is just equal to the height difference of the lower end surface of the isolation column, and the inclination of the lower end surface of the isolation column is about 18 degrees; thus, the electrolyte solution flowing out does not generate a large disturbance. The external electrode binding post is arranged on the outer cylindrical surface of the external graphite electrode. When the fluid flows into the annular space, the fluid is blocked at the lower end face of the isolation column, and the flowing direction can only flow in the direction of the flow guide pipe, so that a detection channel is formed.
The upper end of the internal screwed connection pipe is connected with the lower end of the external graphite electrode, and the Y-shaped filter is connected with the lower end of the internal screwed connection pipe. The Y-shaped filter can be quickly connected into an industrial pipeline, so that online measurement is realized, and the Y-shaped filter is convenient to detach and clean.
In this embodiment, as shown in fig. 3, in order to protect the inner graphite electrode and the outer graphite electrode and improve the anti-interference capability of the device, the device further comprises a housing device, a temperature probe cable connected with a temperature probe, an electrode cable connected with an inner electrode binding post and an outer electrode binding post, wherein the housing device is made of metal and is grounded, the housing device comprises an upper cover plate, a lower cover plate, a left cover plate and a right trough plate, the upper cover plate is arranged above the right trough plate, the lower cover plate is arranged below the right trough plate, the left cover plate is arranged on the left side of the right trough plate, a cuboid housing device is formed after each cover plate is arranged, a wire outlet hole is formed in the upper cover plate, a wire outlet hole is formed in the right trough plate, and a wire inlet hole is formed in the lower cover plate; the inner graphite electrode, the outer graphite electrode, the isolation column, the outer electrode binding post, the inner electrode binding post and the diversion pipe are all installed in the right groove plate, the temperature probe cable and the electrode cable extend out of the wire outlet hole of the upper cover plate, the diversion pipe extends out of the wire outlet hole of the right groove plate, and the Y-shaped filter penetrates through the wire inlet hole on the lower cover plate and is connected with the lower end of the inner threaded joint. The temperature probe cable adopts a three-core shielding cable, and a shielding wire of the three-core shielding cable is grounded. The electrode cable adopts a three-core coaxial cable, two cores are used for conducting signals, and shielding wires of the two cores are connected with magnetic beads in series and then grounded; the other core is grounded and then connected to the shell device.
The working process and principle of the invention are as follows: the industrial flow type low-conductivity electrode graphite sensor is connected into electrolyte solution to be detected, the electrolyte solution enters from the Y-shaped filter, sequentially passes through an annular gap between the inner screwed nipple, the inner graphite electrode and the outer graphite electrode, and then flows out from the guide pipe; meanwhile, an alternating current constant current excitation signal flows into the outer graphite electrode through the outer electrode binding post, then passes through an annular gap between the inner graphite electrode and the outer graphite electrode, and then reaches the signal ground-the inner graphite electrode is terminated; the alternating current and constant current flow through the detection space to generate corresponding detection signals (voltage signals), and the detection signals are transmitted to the singlechip circuit through the circuit to complete the whole measurement process. Because the conductivity and the temperature are related, in the measuring process, a voltage signal generated by the temperature change measured by the temperature probe is directly input into the singlechip, and is supplied for the measuring process without other conversion circuits and only by a single power supply.
When the dirt is serious, the filter and the electrode conductive surface can be cleaned periodically, so that the electrode performance is restored. The conductive resistance of the low-conductivity liquid is large, so that the allowable resistance of the scale is correspondingly large, the influence of certain scale on the detection precision is small, and the cleaning frequency of the scale can be small.
The foregoing is merely illustrative of one embodiment of the present invention, and in fact, the inner graphite electrode and the outer graphite electrode of the present invention may take other shapes, such as a rectangular parallelepiped graphite column for the inner graphite electrode and a hollow rectangular parallelepiped graphite column for the outer graphite electrode; the draft tube and the isolation column can also be made of other insulating and corrosion-resistant materials, etc.
In addition to the modes mentioned in the present embodiment, the embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the embodiment, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be equivalent to the embodiment, and all the modifications are included in the protection scope of the present invention.
Claims (7)
1. The industrial flow type low-conductivity electrode graphite sensor is characterized in that: the insulation column is coaxially arranged between the outer graphite electrode, the insulation column and the inner graphite electrode, the insulation column is in sealing connection with the outer graphite electrode and the inner graphite electrode, the temperature probe and the inner electrode binding post are arranged on a section of the upper end face of the inner graphite electrode extending out of the insulation column, the outer electrode binding post is arranged on the outer surface of the outer graphite electrode, the guide pipe is arranged on the outer surface of the outer graphite electrode in an inserting mode and communicated with the annular gap, and the guide pipe are positioned below the lower end face of the insulation column at the joint of the inner surface of the outer graphite electrode; the flow guide pipe is vertically arranged on the outer surface of the outer graphite electrode or is obliquely upwards arranged on the outer surface of the outer graphite electrode; the lower end face of the isolation column is an inclined plane, and the height difference of the inclined plane is equal to the diameter of the flow guide pipe; the outer graphite electrode is a graphite tube, the inner graphite electrode is a graphite column, the isolation column is an insulating and corrosion-resistant plastic tube, the graphite tube, the plastic tube and the graphite column are coaxially arranged, the lower end face of the inner graphite electrode is flush with the lower end face of the outer graphite electrode, the upper end face of the isolation column is flush with the upper end face of the outer graphite electrode, and the upper end of the inner graphite electrode extends out of the upper end face of the isolation column.
2. The industrial flow-through low conductance electrode graphite sensor as defined in claim 1, wherein: the temperature probe is arranged on the top surface of the upper end of the inner graphite electrode, and an inner electrode binding post is arranged on the outer cylindrical surface of a section of the upper end surface of the inner graphite electrode, which extends out of the isolation column.
3. The industrial flow-through low conductance electrode graphite sensor as defined in claim 1, wherein: the model of the temperature probe is LM35DZ.
4. The industrial flow-through low conductance electrode graphite sensor as defined in claim 1, wherein: the graphite electrode is characterized by further comprising an internal screwed pipe and a Y-shaped filter, wherein the upper end of the internal screwed pipe is connected with the lower end of the external graphite electrode, and the Y-shaped filter is connected with the lower end of the internal screwed pipe.
5. The industrial flow-through low conductance electrode graphite sensor as defined in claim 1, wherein: the isolation column is in sealing connection with the inner graphite electrode and the outer graphite electrode through corrosion-resistant glue.
6. The industrial flow-through low conductance electrode graphite sensor as defined in claim 1, wherein: the isolating column and the flow guide pipe are both made of polytetrafluoroethylene materials.
7. The industrial flow-through low conductivity electrode graphite sensor according to any of claims 1-6, wherein: the device also comprises a shell device, a temperature probe cable connected with the temperature probe and an electrode cable connected with the inner electrode binding post and the outer electrode binding post, wherein the shell device is made of metal, is grounded and comprises an upper cover plate, a lower cover plate, a left cover plate and a right groove plate, an inner graphite electrode, an outer graphite electrode, an isolation column, the outer electrode binding post, the inner electrode binding post and a diversion pipe are all arranged in the right groove plate, the electrode cable and the temperature probe cable extend from the wire outlet hole of the upper cover plate arranged above the right groove plate, the guide pipe extends from the wire outlet hole of the right groove plate, the Y-shaped filter is connected with the lower end of the internal threaded connector through the wire inlet hole arranged on the lower cover plate below the right groove plate, and the left cover plate is arranged on the left side of the right groove plate.
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| CN201710412842.1A CN107219267B (en) | 2017-06-05 | 2017-06-05 | Industrial flow type low-conductivity electrode graphite sensor |
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| CN201710412842.1A CN107219267B (en) | 2017-06-05 | 2017-06-05 | Industrial flow type low-conductivity electrode graphite sensor |
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| CN107219267A CN107219267A (en) | 2017-09-29 |
| CN107219267B true CN107219267B (en) | 2023-04-21 |
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| CN113189167B (en) * | 2021-02-24 | 2022-06-17 | 中国核动力研究设计院 | Annular electrochemical sensor probe |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201397365Y (en) * | 2009-05-11 | 2010-02-03 | 国家海洋技术中心 | Conductivity sensor with seven electrodes |
| CN104950177A (en) * | 2015-06-17 | 2015-09-30 | 华南理工大学 | Circulating type industrial on-line seven-electrode conductivity sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101479460B1 (en) * | 2012-12-12 | 2015-01-05 | 주식회사 엘지화학 | Electrode for a secondary battery, secondary battery and cable-type secondary battery including the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201397365Y (en) * | 2009-05-11 | 2010-02-03 | 国家海洋技术中心 | Conductivity sensor with seven electrodes |
| CN104950177A (en) * | 2015-06-17 | 2015-09-30 | 华南理工大学 | Circulating type industrial on-line seven-electrode conductivity sensor |
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