CN210604488U

CN210604488U - Novel low-cost seven-electrode conductivity cell device

Info

Publication number: CN210604488U
Application number: CN201921550114.8U
Authority: CN
Inventors: 刘炳岳; 范寒柏; 宋文妙
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-05-22
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a novel low-cost seven-electrode conductivity cell device, which comprises a zirconia ceramic flow guide pipe, seven annular grooves arranged on the inner wall of the zirconia ceramic flow guide pipe, a nickel layer arranged in the annular grooves and a platinum electrode arranged on the nickel layer, wherein the platinum electrode is contacted with a lead hole on the zirconia ceramic flow guide pipe; the platinum electrode comprises a current electrode, a first voltage electrode, a second voltage electrode and a grounding electrode in sequence from the center to two sides, the distance between the grounding electrode and the second voltage electrode is 3mm, and the distance between the second voltage electrode and the first voltage electrode is 4.5 mm. The device has high precision, good stability, low cost and good compressive strength, can be applied to buoys and ship bodies, can measure the salinity in the deep sea field, and ensures effective welding sealing between the annular electrode made of high-purity platinum materials and the ceramic flow guide pipe.

Description

Novel low-cost seven-electrode conductivity cell device

Technical Field

The utility model belongs to the technical field of conductivity cell technique and specifically relates to a novel seven electrode conductivity cells of low cost device is related to.

Background

The measurement of the ocean salinity parameter has very important significance for the aspects of ocean economic development, military strength construction, ocean environment protection and the like. In actual measurements, seawater salinity can be reflected by seawater conductivity. Therefore, the seawater conductivity parameter is an essential parameter in marine instrument measurement. Current conductivity sensors are largely classified into electrode type and electromagnetic type. The electromagnetic sensor has firm structure and high response speed, but is easy to be interfered by electromagnetism, and the precision in the using process is difficult to ensure. The electrode type sensor is divided into two electrodes, three electrodes, four electrodes and seven electrodes, and the seven-electrode conductivity sensor has the characteristics of strong anti-interference capability and high precision.

The conductivity sensor used on the warm salt deep section instrument in China is mainly a three-electrode sensor developed in the period of 'nine five' and 'fifteen', and the national ocean technology center in 2009 proposes that artificial sapphire is used as an insulating material to manufacture a seven-electrode conductivity cell. Although the sensor has high precision, the artificial sapphire is expensive. Therefore, this factor hinders mass production of the warm salt deep cross-section apparatus.

In the processing technology of the seven-electrode conductance cell, a method of sintering high-quality glass is adopted in the early stage, and the method has the following three disadvantages. Firstly, in order to increase the conductive area of the electrode, the electrode needs to be plated with platinum black, and the electrode after being plated with platinum black becomes rough, which easily causes the attachment of microorganisms, so that the seawater flowing through the conductivity cell is blocked, and the measurement error is caused; secondly, the electrode of the conductivity cell and the glass tube wall adopt a thin platinum wire single-point fixing mode, if the condition of seawater flow velocity change is met in a measurement field, the electrode is easy to shake, and thus the measurement precision is influenced; and thirdly, the thermal expansion coefficients of the metal electrode and the glass tube wall are different, and when the temperature changes, a gap is easily generated between the conductivity cell and the tube wall according to the principle of expansion with heat and contraction with cold, so that the conductivity of the conductivity cell is changed, and the measurement precision is finally influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel seven electrode conductance cells of low cost device, the precision is high, stability is good, and is with low costs, compressive strength is good moreover, both can use on buoy, hull, can carry out the salinity measurement in the deep sea field again, has guaranteed effectual welded seal between high-purity platinum alloy material's ring electrode and the pottery honeycomb duct.

In order to achieve the purpose, the utility model provides a novel low-cost seven-electrode conductivity cell device, which comprises a zirconia ceramic flow guide pipe, seven annular grooves arranged on the inner wall of the zirconia ceramic flow guide pipe, a nickel layer arranged in the annular grooves and a platinum electrode arranged on the nickel layer, wherein the platinum electrode is contacted with a lead hole on the zirconia ceramic flow guide pipe;

the platinum electrode comprises a current electrode, a first voltage electrode, a second voltage electrode and a grounding electrode in sequence from the center to two sides, the distance between the grounding electrode and the second voltage electrode is 3mm, the distance between the second voltage electrode and the first voltage electrode is 4.5mm, and the distance between the first voltage electrode and the current electrode is 3 mm.

Preferably, the depth of the annular groove is 0.2 mm.

Preferably, the width of the current electrode and the ground electrode is 3.5mm, and the width of the first voltage electrode and the second voltage electrode is 1.5 mm.

Preferably, the diameter of the lead hole is 0.6mm, and the lead holes are arranged in seven, which are respectively in contact with the ground electrode, the first voltage electrode, the second voltage electrode and the current electrode.

Preferably, the zirconia ceramic honeycomb duct has an outer diameter of 12mm, an inner diameter of 8.4mm and a length of 46 mm.

Therefore, the utility model adopts the above structure novel seven electrode conductance cells of low cost device possesses following technological effect: the honeycomb duct adopts an integral turning and polishing process, so that the flow guiding effect is enhanced, and biological adhesion is prevented; in the aspect of material selection, a zirconia ceramic material is selected as a flow guide pipe, so that the cost is greatly reduced; in the platinum plating process, the process of plating nickel and then plating platinum on the inner wall of the ceramic flow guide tube is adopted, so that the electrode and the flow guide tube are effectively sealed, and the stability of the seven-electrode sensor is ensured.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the novel low-cost seven-electrode conductivity cell device of the present invention.

Detailed Description

Examples

Fig. 1 is a schematic diagram of the embodiment of the novel low-cost seven-electrode conductivity cell device of the present invention, as shown in the figure, the present invention provides a novel low-cost seven-electrode conductivity cell device, which comprises a zirconia ceramic draft tube 1, seven annular grooves 2 arranged on the inner wall of the zirconia ceramic draft tube 1, a nickel layer 3 arranged in the annular grooves 2, and a platinum electrode arranged on the nickel layer 3, wherein the platinum electrode is in contact with lead holes 4 on the zirconia ceramic draft tube 1, the diameter of the lead holes 4 is 0.6mm, the lead holes 4 are seven, and the seven lead holes 4 are respectively in contact with a grounding electrode 8, a first voltage electrode 6, a second voltage electrode 7 and a current electrode 5; the zirconia ceramic honeycomb duct 1 has an outer diameter of 12mm, an inner diameter of 8.4mm and a length of 46mm, the platinum electrode sequentially comprises a current electrode 5, a first voltage electrode 6, a second voltage electrode 7 and a grounding electrode 8 from the center to two sides, the distance between the grounding electrode 8 and the second voltage electrode 7 is 3mm, the distance between the second voltage electrode 7 and the first voltage electrode 6 is 4.5mm, the distance between the first voltage electrode and the second voltage electrode determines the sensitivity of a measuring signal of the sensor, the larger the distance between the two voltage electrodes is, the larger the resistance value of the equivalent resistance of the measured solution is, the larger the voltage value of an effective signal is, and the resolution of the measuring result is increased. The distance between first voltage electrode 6 and current electrode 5 is 3mm, the utility model discloses a nickel layer plates the annular groove in through chemical method, has plated the nickel layer after on plating the nickel layer with the platinum electrode plate to the nickel layer, has constituted seven electrodes, zirconia ceramic flow guide pipe inner wall and platinum electrode direct contact sea water, and the lead wire that the platinum electrode lead wire passed zirconia ceramic flow guide pipe inner wall is drawn forth, inserts sensor circuit, has guaranteed that the effective welding between the annular electrode of high-purity platinum material and the zirconia ceramic honeycomb duct is sealed. The zirconia ceramic diversion pipe material adopts ceramics to replace foreign quartz glass and domestic artificial sapphire, and brings the advantages that the hardness of the ceramics is second to that of diamond, the pressure resistance of the diversion pipe can be greatly increased, and the diversion pipe material is suitable for measuring the salinity of deep sea water; in addition, the zirconia ceramic has the advantages of small expansion coefficient, high compressive strength, good insulating property and chemical corrosion resistance, is close to the expansion coefficient of metal platinum, can ensure that the seven-electrode sensor carries out salinity measurement in the deep sea field, and has low production cost, thereby greatly reducing the whole manufacturing cost and providing a foundation for the low-cost mass production of the seven-electrode sensor.

The depth of the annular groove 2 is 0.2 mm; the width of the current electrode 5 and the ground electrode 8 was 3.5mm in order to increase the conductive area, and the width of the first voltage electrode 6 and the second voltage electrode 7 was 1.5 mm. In the processing technology, the integral turning technology is adopted, and the wall of the zirconia ceramic flow guide pipe is polished, so that the smoothness of the wall of the pipe is ensured, the adhesion of microorganisms is prevented, and the flow guide effect is enhanced. In the zirconium oxide ceramic guide pipe, seven platinum electrodes are arranged in the inner wall of the pipe from top to bottom at a certain distance, in the platinum plating process, nickel is plated on the inner wall of the zirconium oxide ceramic guide pipe according to the shapes of the seven platinum electrodes to form a nickel layer, so that the purpose of enhancing the adhesion strength of a plating layer is achieved, then the platinum electrodes are plated on the nickel layer, the effective welding and sealing between the annular electrode made of high-purity platinum materials and the ceramic guide pipe are ensured, and the accuracy of long-term stable measurement is ensured.

Therefore, the utility model adopts the above structure novel seven electrode conductance cells of low cost device, the precision is high, stability is good, and is with low costs, compressive strength is good moreover, both can use on buoy, hull, can carry out the salinity measurement in the deep sea field again, has guaranteed effectual welded seal between high-purity platinum alloy material's ring electrode and the ceramic honeycomb duct.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.

Claims

1. The utility model provides a novel seven electrode conductance cells of low cost device which characterized in that:

the device comprises a zirconia ceramic flow guide pipe, seven annular grooves arranged on the inner wall of the zirconia ceramic flow guide pipe, a nickel layer arranged in the annular grooves and a platinum electrode arranged on the nickel layer, wherein the platinum electrode is in contact with a lead wire hole on the zirconia ceramic flow guide pipe;

2. The novel low-cost seven-electrode conductivity cell device of claim 1, wherein: the depth of the annular groove is 0.2 mm.

3. The novel low-cost seven-electrode conductivity cell device of claim 2, wherein: the width of the current electrode and the width of the grounding electrode are 3.5mm, and the width of the first voltage electrode and the width of the second voltage electrode are 1.5 mm.

4. The novel low-cost seven-electrode conductivity cell device of claim 3, wherein: the diameter of the lead hole is 0.6mm, the number of the lead holes is seven, and the seven lead holes are respectively contacted with the grounding electrode, the first voltage electrode, the second voltage electrode and the current electrode.

5. The novel low-cost seven-electrode conductivity cell device of claim 4, wherein: the outer diameter of the zirconia ceramic honeycomb duct is 12mm, the inner diameter of the zirconia ceramic honeycomb duct is 8.4mm, and the length of the zirconia ceramic honeycomb duct is 46 mm.